rexresearch.com
Ralph MOODY, Jr.
Back Pressure Turbocharger
Back Pressure Turbocharger
Ralph Moody, Jr.got 84 mpg from a Ford
Capri modified with a turbocharged back-pressure regulator on
4 cylinder Perkins diesel engine.
http://www.abovetopsecret.com/forum/thread945991/pg1
Ralph Moody and the Moodymobile
...So I was at work, and working in a hospital, we began discussing healthcare and the financial problems that are resulting from the low reimbursements which are directly impacting patient care. The conversation then progressed to other ways the government is screwing people, and ended with this ...
My coworker has an uncle whom I had not heard of, Ralph Moody. She said she forgets what he did, but he created an 80+ mpg car 30 years ago, that garnered offer from foreign interests in excess of 20 million. She said her uncle was very patriotic, and turned them down wanting to sell the technology to an American car company perhaps, but not to a foreign group. This car, which did not start out as a low MPG project, utilized a carburetor they created to achieve these outstanding results. The federal government showed a lot of interest in the car, so much that they confiscated it. My coworker said the car still sits in a storage area in North Carolina and that her family is allowed to use it, but the property can not be passed down, it no longer belongs to them. I am not one to believe in these magic carburetors, I would love to know more about this particular car...
http://www.caranddriver.com/columns/al-gore-wasnt-the-only-guy-flogging-an-80-mpg-car
Al Gore Wasn't the Only Guy Flogging an
80-mpg Car
by PATRICK BEDARD
by PATRICK BEDARD
"What happened to this?" asks reader Pete Kontes about a 1979 AP wire story clipped from his local paper, the Post-Register, in Idaho Falls, Idaho.
The headline screams, "Former racer could have energy crisis killer."
Readers of a certain age will recognize 1979 as the time between Energy Crisis One and Energy Crisis Two, a grim era of fuel shortages and lines at gas pumps following the OPEC embargo of 1973-74.
The "racer" here was Ralph Moody, most famous as the mechanical wizard who had teamed up with super salesman John Holman to form Holman-Moody, which went through NASCAR in the '60s like Patton had gone through Africa two decades before.
According to the old clipping: "In tests recently at Daytona Beach Community College, Moody's 1979 Mercury Capri test car got an astounding 84 miles to a gallon. The skeptical test supervisor, Bill Gordon, who has supervised Environmental Protection Agency fuel economy tests before, couldn't believe it. 'It is the car of the century,' Gordon said enthusiastically after the test."
The article's description of the engine sounds confused. Moody is quoted as saying, "We took a four-cylinder Perkins block, converted it to diesel fuel, turbocharged it, and built a special clutch, transmission, and rear-end setup."
Other sources simply say it was a Perkins diesel, which sounds more likely.
Those years of iffy fuel supply had the car market in a panic, with frugal Japanese sedans selling far above sticker price and Detroit still caught in the Cutlass Supreme era of chromey two-door hardtop coupes about the size and weight of today's SUVs but with no space in the back seat. American Motors had already responded by dragging its compact Hornet sedan out behind the barn and whacking off most of the useful parts—all of the trunk and a major section of the back seat—to create the worthless Gremlin.
Motorists wanted miles per gallon, and they wanted it instantly. But elephants can't zig. Detroit factories were mostly tooled for big iron. The industry seemed unresponsive, and the media had the persistent notion that some guy somewhere in a one-car garage, armed with only a screwdriver and a Crescent wrench, could outengineer General Motors. The papers were filled with breathless stories like the one of Moody's Capri.
"We just got flooded" with inventors, Howard Padgham remembered recently. He's retired now after years heading Chrysler's powertrain engineering. But neither he nor I remembered Moody's car.
I spent a week in Moody's shop back in 1974 doing field surgery on this magazine's full-race Pinto after an inglorious debut at Talladega. Within hours of leaving, we qualified on the pole for the Charlotte race and later won it with a big lead. I'm sure the other competitors thought Moody had uncorked a few speed secrets for me.
If he had sure-fire recipes, he didn't share them. He seemed a sensible guy, careful about the details as he understood them. He left the big talk to others.
The rumor had been floating around about a Moody mileage maker for a few months before the Capri appeared, something on the order of 60 to 70 mpg. About these numbers, he said later, "They were a little conservative—on purpose. If you come right out saying you've got a car that'll get 80 to 90 miles per gallon, people will think you're some kind of jerk."
Yes, that sounds like the Ralph Moody I knew. He was no Smokey Yunick. But we'll come to the Smoke's mileage maker in a bit.
Padgham confirms another detail of the times. Most of the inventors who came forward with magic miles-per-gallon numbers "were normal people, not charlatans." They set up their tests at constant speeds, on level roads, with their engines fully warmed up. In that driving, even the relatively primitive engines of the time went far on a gallon.
Moody died last summer, so we can't ask him about the Capri, but I did find it listed in Government Involvement in Suppressed Inventions, by Pea Research (iaesr.homestead.com). The lengthy compendium confirms that carburetors were favorite breakthroughs for Uncle Sam's squelching, along with a reassuring number of flying saucers. My thanks to Pea Research for answering reader Kontes's question more eloquently than I could have.
Before we leave the topic of government suppression, however, let's put Moody's achievement in perspective: "They" also got to a "highly modified 1959 Opel" credited with 376.59 mpg.
I don't doubt Padgham when he says most of the inventors weren't charlatans, but it wasn't always easy to tell the difference. Early in 1984 I went down to "The Best Damn Garage in Town," town being Daytona Beach, Florida, along with Don Sherman, C/D technical director at that time, for a look at Smokey Yunick's "phase-one adiabatic hot-vapor" engine. It was a 2.2-liter Chrysler four promising 0 to 60 in six seconds and 50 mpg.
Sherman and I are both engineers by training and wary of those who claim to have found an end run around the laws of thermodynamics. Yunick had been doing his rulebook double-shuffle against NASCAR's canniest tech inspectors for decades before we arrived. We didn't expect a PowerPoint presentation. What we got was the full wizard act, a sinewy guy in the white coveralls you see "before" in the detergent commercials. Even at breakfast I don't remember that he removed his bad-cowboy black hat. It was oil-soaked at the band and permanently embedded with aluminum chips from his machine shop.
He was 60 then. I think the man and his act were already inseparable. If you fell for the act, maybe you wouldn't notice the fundamental outrageousness of his claims. He had a high-compression engine with a turbocharger. Very risky with the crude controls of mixture and timing of those days. The usual technique then and now is to add an intercooler to the intake stream. Yunick had an interheater instead. Yes, retaining heat helps efficiency, at least theoretically, but you might just as well put a .357 Magnum to the cylinder head.
We went out for a test drive. The car pulled like hell. It pinged like hell, too, and busted a piston early in the acceleration runs.
Yunick stuck to his story. We didn't buy it. Later I heard that he had sold his "hot vapor" patents to some big company, along with a multi-year consulting contract that would keep the cash flowing into his pockets. For the honest inventors and for the charlatans alike, that was always the touchdown.
Was he on to something we simply couldn't comprehend? Let's just say, two decades and many mpg regulations later, I don't see any "hot vapor" engines.
http://people.com/archive/ralph-moody-may-travel-the-road-to-riches-in-a-diesel-car-that-gets-84-miles-per-gallon-vol-11-no-20/
Ralph Moody May Travel the Road to Riches
in a Diesel Car That Gets 84 Miles Per Gallon
By Sandra Hinson
By Sandra Hinson
About a year ago Ralph Moody, a legendary stock car driver and mechanic, was thinking about retiring. “All I wanted to do,” he says, “was a little bit of nothing.” Today Moody has postponed the rocking chair in favor of rocking the auto industry. He and a pal have designed a car with an engine that gets up to 84 miles to a gallon of diesel fuel. The Moodymobile, as it’s called, came out of the Oak Hill, Fla. auto shop of Mike Shetley, whom Moody knew from their days together on the Ford racing team. Shetley had summoned his old boss from his Charlotte, N.C. home to help with a complicated chassis for a Thunderbird replica. Moody, 60, solved the problem in a week, and soon the men were talking about building a sports car with a diesel engine. “The idea wasn’t high mileage in the beginning,” says Shetley, 36. “We wanted a nice-driving car for the guy who couldn’t afford luxury.”
What they did was modify, inside and out, a four-cylinder Perkins diesel engine (like those used in motorboats) and drop it into a 1979 Capri body, adding a turbocharger for extra power. (The turbocharger reroutes hot exhaust gases that normally escape from the tail pipe.) The Moodymobile was soon stirring interest locally and was test-driven by Congressman Bill Chappell. He immediately wired President Carter: “I’ve seen it, I’ve driven it and it works.”
A fortnight ago Moody and Shetley drove the car 850 miles to Washington, D.C. (on 11.1 gallons of fuel) and testified before the Senate Energy Committee. The car (which is noisier than a conventional one) faces a stiff battery of environmental tests before it can be marketed, but Moody is confident one of the big automakers will buy the rights to the patent. Ford, Chrysler and General Motors have all expressed interest.
Born in Massachusetts, Moody raced midget cars as a teenager and in 1956 joined Ford, later becoming chief mechanic. That meant giving up competitive driving. “I could still outrun them,” he proclaims. “I did all the test work.” Champion drivers like Mario Andretti, A.J. Foyt, Cale Yarborough and Bobby Allison have won with Moody-groomed Fords. He also designed much of the safety equipment now standard in stock cars.
When Ford stopped racing in 1971, Moody opened a small “speed shop” in Charlotte (a city he, his wife Mitzi, 53, son Ralph III and daughter Ann have lived in for 23 years). He began selling race cars to drivers and, as a sideline, refined a gasoline engine that gets up to 65 miles per gallon. “We put it on the shelf,” Moody shrugs. “Nobody needed it then.”
Shetley claims — perhaps extravagantly — that they have turned down $100 million from Arab interests to buy rights to the Moodymobile, which has cost them $20,000 to develop. Meanwhile, the designers are filing away in cardboard boxes the names of private citizens eager to place orders. Possibly 2,000 of the cars will be available late this year for about $7,000 apiece. And for the time being, Ralph Moody has put off retirement. “In the old days on the racing circuit, I worked day and night,” he smiles. “Now it’s only 20 hours a day.”
Popular Mechanics ( August 1979 )
"Osculate my tailpipe, Detroit !"
Ralph Moody Jr.
Ralph Moody Jr.
WO9216725
APPARATUS REGULATING EXHAUST FLOW TO INCREASE BACK PRESSURE IN AN INTERNAL COMBUSTION ENGINE
APPARATUS REGULATING EXHAUST FLOW TO INCREASE BACK PRESSURE IN AN INTERNAL COMBUSTION ENGINE
Inventor: MOODY RALPH A JR
The internal combustion engine (10) includes a fuel delivery system (200) and an exhaust system having an apparatus (44) for regulating exhaust flow to increase engine back pressure. In response to regulated exhaust flow and increased engine back pressure, the fuel delivery system (200) is controlled to decrease fuel flow resulting in increased fuel efficiency of the engine and decreased exhaust emissions. A forced air induction system such as a turbocharger (80) or supercharger may also be used in conjuction with the engine (10). In preferred embodiments, the exhaust flow regulating apparatus (44) is either a fixed cross-sectional area orifice or a variable cross-sectional area orifice.
Background of the Invention
Internal combustion engines are widely used to provide power for vehicles and machinery, and therefore, it is desirable to design these engines so that fuel consumption and emissions are reduced.
Air flow through conventional diesel internal combustion engines is not controlled and exhaust flow is generally increased by designing these engines with reduced exhaust restrictions. Air flow through conventional gasoline engines is controlled by restrictions in the induction side which create lower than wide open throttle combustion pressures resulting in combustion efficiency losses under normal operation. Prior art teaches that internal combustion engine efficiencies are improved by reducing exhaust system restrictions.In a Society of Automotive Engineers article titled "The Influence of the Exhaust Back Pressure of a Piston Engine on Air Consumption, Performance, and Emissions", January 8-12, 1973, the authors showed that engine air consumption responds to variation of the ratio of absolute exhaust back pressure to absolute inlet manifold pressure with a strong dependence on engine speed, and that exhaust back pressure affects performance and lowers some exhaust emissions. The authors, however, did not investigate how fuel efficiency is affected when exhaust flow is regulated to increase engine back pressure while at the same time reducing fuel flow.
Summary of the Invention
The internal combustion engine of the invention includes a fuel delivery system and an exhaust system having an apparatus for regulating exhaust flow through the engine to increase engine back pressure. In response to regulated exhaust flow and increased engine back pressure, the fuel delivery system is controlled to decrease fuel flow resulting in increased fuel efficiency. Reduced exhaust emissions also result. A forced air induction system such as a turbocharger or supercharger may also be used in conjunction with the engine.
In general, the apparatus for controlling exhaust flow and increasing engine back pressure is any restriction positioned within the exhaust system of either a diesel or gasoline (spark ignition) internal combustion engine. In one embodiment the apparatus is a venturi system having a large opening tapering to a smaller opening that allows exhaust to flow from the large opening through the smaller opening. Alternatively, the exhaust flows through a venturi system having an opening formed by a fixed side and a movable side adjustable at various engine operating parameters by an actuating system to establish a desired increase in back pressure.
The internal combustion engine of the invention directly contradicts the prior art in that back pressure is increased resulting in increased fuel efficiency. The advantages of the internal combustion engine of the invention are that fuel efficiency is increased because induction side losses of the gas engine can be reduced, the dynamic combustion pressures of both diesel and gas engines are increased, exhaust flow in both diesel and gas engines is controlled, and when utilized in conjunction with a forced air induction system such as a turbocharger or supercharger, the invention eliminates the need for and efficiency losses of a dump valve or wastegate valve that is normally required for forced air induction system overpressure protection.
Brief Description of the Drawings
Fig. 1 is a perspective view of one embodiment of the internal combustion engine of the invention;
Fig. 2 is a cross-sectional view of apparatus for regulating exhaust flow to increase engine back pressure having a large opening tapering to a smaller opening;
Fig. 3 is a cross-sectional view of apparatus having a variable orifice for adjustably regulating exhaust flow to increase engine back pressure;
Fig. 4 is a cross-sectional view taken along line 4-4 of the Fig. 3 apparatus;
Fig. 5 is a perspective view of the internal combustion engine of the invention showing a turbocharger connected to the exhaust system;
Fig. 6 is a side view of the turbocharger shown in Fig. 5;
Fig. 7 is a front view with parts broken away from the turbocharger shown in Fig. 5;
Fig. 8 is an alternate perspective view showing a controllable fuel delivery system;
Fig. 9 is a graph showing intake manifold boost pressure as a function of RPM;
Fig. 10 is a graph showing exhaust manifold back pressure as a function of RPM; and
Fig. 11 is a graph showing the ratio of boost pressure to back pressure at maximum acceleration conditions expressed in gauge pressures as a function of RPM.
Description of the Preferred Embodiments
As shown in Fig. 1, an internal combustion engine 10 includes a cylinder head 12, intake manifold 14, exhaust manifold 16 and a controllable fuel delivery system 200 as shown in Fig. 8. The exhaust manifold 16 includes a pair of hollow spaced legs 18 and 20 connected to the cylinder head 12 by plates 22 and fasteners 24. Alternatively, plates 22 can be welded to the cylinder head 12 or be cast integrally with the cylinder head 12 with the prime consideration being that whatever mode of connection is used the connection should be substantiaffily airtight. The free ends of legs 18 and 20 merge at 26 and 28 respectively, preferably in a smooth curvilinear manner, into a conduit passageway 30 disposed parallel to and spaced from the cylinder head 12.
The free end of the conduit 30 terminates at an exhaust section 32, this section preferably being a smooth curved section, to which a mounting flange 34 is secured. The flange 34 removably supports an exhaust pipe 36 having an inlet 38 terminating in a flange 40 complementally fastened to the flange 34 by nuts and bolts 42 or similar fasteners.
The controllable fuel delivery system 200 as shown in Fig. 8 comprises a fuel tank 137, fuel line 143, transfer fuel pump 142, fuel line 141, fuel filter 140, fuel line 139, fuel flow control lever 160, conventional rotary style fuel injection pump -133, injector lines 135, fuel injectors 134, return fuel line 138 from the fuel injectors 134, and return fuel line 136 from the fuel injection pump 133. Fuel flows from the fuel tank 137, to the transfer fuel pump 142, through the filter 140 to the fuel injection pump 133. Rate of fuel flow from the fuel injection pump 133, via lines 135 to the fuel injectors 134, is controlled by the fuel flow control lever 160. Residual fuel that is not injected into the engine is then returned to the fuel tank 137 via the return lines 136 and 138. The purpose for the return lines 136 and 138 is twofold. First, the return lines 136 and 138 allow for pump and injector cooling, especially under low load or idling conditions, and second, they allow for venting of unwanted gases that may accumulate in the system. The fuel flow spray pattern of the controllable fuel delivery system 200 may be a cone shaped fuel flow spray pattern.
It has been found that by regulating the exhaust flow exiting the engine to increase engine back pressure, air flow entering the engine can be controlled, and engine efficiency will be significantly improved when fuel flow is also reduced. Exhaust emissions will be significantly reduced as compared with conventional diesel and gas internal combustion engines.
As shown in Fig. 2, this result is obtained by placing apparatus for controlling exhaust flow to increase engine back pressure within the exhaust system. A venturi system 44 is placed between exhaust section 32 of the conduit passageway 30 and the inlet 38 of the exhaust pipe 36. The venturi system 44, in its simplest form, comprises a funnel-like member 46 having a large opening 48 tapering to a smaller opening 50. A flange 52 disposed about the opening 48 is removably secured between exhaust section flange 34 and inlet flange 40 by fasteners 42 for keeping the venturi system 44 in position. The venturi system 44 may also be formed as an integral part of exhaust section 32 of conduit 30 or of the inlet 38 of the exhaust pipe 36.
Exhaust flows from the large opening 48 through the smaller opening 50, thus regulating exhaust flow to increase engine back pressure. Operation of the internal combustion engine 10 incorporating the fixed venturi system 44 of Fig. 2 is identical to the operation of existing internal combustion engines commonly used in vehicles. The fixed venturi system 44 can also be incorporated into engines, such as industrial engines, operating under constant loads.
Alternatively, as shown in Figs. 3 and 4, a venturi system 44 is constructed as a variable cross-sectional area venturi system which can be utilized in engines, such as automobile engines, operating under a range of dynamic loads. Exhaust section 32 of conduit 30, shown in Fig. 1, transitions from a round to rectangular shape at section 56 terminating at rectangular section 58 having a rectangular flange 60. The variable venturi system 44 is positioned at the rectangular inlet 62 of exhaust pipe 64, such rectangular inlet 62 having a rectangular inlet flange 66 connected to rectangular flange 60 by nuts and bolts 68.
The variable venturi system 44 comprises a fixed converging side 70, and a moveable side 72, which rotates with a shaft 74 movable by an arm 76 having a hole 78 for connection to an actuating device (not shown). In addition to increasing engine back pressure and reducing fuel flow, the variable venturi system 44 of the invention may be used as the engine's main control, thus eliminating the induction side throttling device currently required for operation of non-diesel engines.
Rudimentary operation of the internal combustion engine 10 incorporating the variable venturi system 44 of Figs. 3 and 4 may be accomplished by connecting the throttle pedal (not shown) to the fuel flow control lever 160 of Fig. 8 and the arm 76 of Fig. 3 by cam linkages. Actuation of the throttle pedal will change the position of the fuel flow control lever 160 and cause the arm 76 to vary the position of the movable side 72 of the venturi system 44.
In another embodiment, operation of the internal combustion engine 10 incorporating the variable venturi system 44 is effectuated by a microprocessor (not shown) that receives information from engine sensors (not shown) that measure various operating parameters. The microprocessor analyses the received information and sends optimum position output information to the fuel flow control lever 160 and arm 76 which, in turn, positions the movable side 72 of the venturi system 44. Examples of sensors that may be incorporated into the internal combustion engine 10 of the invention are sensors that measure oxygen concentration, coolant temperature, manifold air pressure, vehicle speed, throttle position, engine RPM, mass air flow, detonation (anti-knock), exhaust temperature, exhaust manifold pressure and fuel flow.The throttle pedal, connected to an input transducer (not shown), in effect, acts as the throttle position sensor. When a forced induction system such as a turbocharger is used in conjunction with the engine, as discussed below, additional sensors that measure boost pressure and turbocharger RPM may also be used for optimization of the positions of the fuel flow control lever 160 and the movable venturi system 44.
During engine idle, the variable venturi system 44 and fuel flow control lever 160 are positioned at a predetermined minimum setting. The fuel flow, controlled by the fuel flow lever 160, is continuously and automatically adjusted to maintain proper fuel mixture based on engine speed, mass air flow, and oxygen concentration sensor input. The position of arm 76, as shown in Fig. 3, is continuously and automatically adjusted for idle speed control. Because engine load may vary at idle due to accessory demands, the movable side 72 is constantly repositioned to maintain minimum idle speed.
Upon desired acceleration, the throttle position sensor delivers an increasing voltage to the microprocessor which, in turn, increases the opening of the variable venturi system 44. Based on input from other operating sensors, the fuel flow control lever 160 is adjusted to regulate fuel flow resulting in an optimum air to fuel ratio. If maximum engine speed is achieved inadvertently, the microprocessor can reduce engine speed by reducing fuel flow and/or air flow by repositioning the fuel flow control lever 160 and/or the movable side 72 of the venturi system 44. In addition, if the engine is equipped with a turbocharger, the manifold air pressure sensor will supply input to the microprocessor causing the microprocessor, upon approach of maximum inlet manifold boost pressure, to begin closing the variable venturi system 44.As this action occurs, the mass air flow and the fuel flow will be reduced to maintain air to fuel ratios within an acceptable range.
Oxygen concentration sensors can also be used in conjunction with mass air flow sensors for maintaining air to fuel ratios. If the boost pressure increases beyond a desired maximum, the microprocessor will respond by initially causing the fuel flow control lever 160 and the movable side 72 to close until an acceptable air flow and manifold pressure is achieved. The engine will then return to the desired boost operating mode and optimum air flow to fuel flow will be retched by the gradual opening of the venturi 44 which is limited by the manifold air pressure sensor. When the opening of the venturi 44 is limited, the microprocessor will also limit the opening of the fuel flow control lever 160 to maintain acceptable fuel to air ratios while controlling maximum boost pressure.It is noted that the fixed venturi system 44 of Fig. 2 cannot exceed a maximum boost pressure because the smaller opening 50 is designed to control the maximum boost pressure.
At maximum deceleration, fuel flow is completely shut off by closing the fuel flow control lever 160, and the movable side 72 of the venturi system 44 is returned to a preset minimum position. When the engine approaches idle speed, the fuel flow is turned back on and the engine begins operating under idle conditions. Moderate deceleration is achieved by varying the position of the movable side 72 based on input from various operating sensors including the throttle position sensor. Fuel flow to fuel injectors 134, as shown in Fig. 8, is reduced proportionally as air flows are reduced by the closing of the variable venturi system 44.
As previously mentioned, the internal combustion engine 10 of the invention may be used in conjunction with a forced air induction system such as a turbocharger. Figs. 5 and 6 show a removable turbocharger 80 attached to the exhaust section 32 of the internal combustion engine 10 at mounting flange 34 removably supporting the turbocharger 80. A housing 82 included in turbocharger 80 comprises a tangentially disposed conduit section 84 extending outwardly from the housing 82 with its free end 86 terminating at flange 88 complementally fastened to flange 34 by nuts and bolts 42 or similar fasteners.
Further details of the turbocharger 80 are illustrated in Figs. 5, 6 and 7, and include a totally enclosed generally cylindrical outer housing 82 having an axially disposed air inlet 90 having conduit means 91 and an axially disposed exhaust outlet 92 having conduit means 93, preferably at opposite ends thereof. An additional radially positioned opening 94 is provided adjacent to air inlet 90 and communicates therewith to convey air entering inlet 90 to the intake manifold 14 by conduit means 96 removably secured at one end to opening 94 and at the other end 98 to an opening 100 provided in the wall of intake manifold 14.
The housing 82 further includes rotor housing sections 102 and 104, preferably bulbous-like, directly behind the axial disposed openings 90 and 92 and receiving rotors 106 and 108 each including a plurality of blades 110 and 112, respectively, radially disposed about a hub in conventional fashion. The rotors 110 and 112 are mounted on a common shaft mounted for rotation within housing 82. A recessed section 114 connects the rotor housing sections 102 and 104 and an oil line 116 communicating with an oil source (not shown). The oil line 116, positioned at the top of housing 82, discharges oil into the interior of housing 82 to lubricate the bearings rotatably supporting the rotor shaft. An oil return line 118 positioned at the bottom of recessed section 114 returns oil to the source.
The housing 82 is further seen to be formed of section parts to permit ready access to the interior thereof, and to this end, the rotor housing section 104 is formed with a flange 120 which is removably secured to flange 122 of recessed section 114 by a standard peripheral clamp (not shown) similar to standard peripheral clamp 130. The other flange 126 of recessed section 114 mates with flange 128 of rotor housing section 102 and is held in place by the standard peripheral clamp 130 having a nut and bolt means for holding the clamp 130 in place. A gasket 132 or the like, is used (only one being shown) to make the joints between flanges 120, 122, 126, 128 airtight.
While the weight of the turbocharger 80 is mainly supported by exhaust manifold 16 and its connection thereto, the conduit means 91, 93, and 96 associated therewith, also aid in the suspension of the turbocharger as the free ends thereof are connected to other supporting structures The free end of conduit 91 is connected to an atmospheric opening, not shown, in the vehicle or machine body, and the free end of the conduit 93 is connected to the exhaust pipe of the vehicle or machine, and the air conducting conduit 96 is connected to the intake manifold 14. The conduits 91, 93, and 96 can be made of any suitable material but it preferred that conduit 91 be made of rubber or the like of the bellows variety to facilitate connection of the conduit 91 to component parts.The air conducting conduit 96 is preferred to be constructed of metal due to temperature and pressure considerations, connected at ends 100 and 94 via rubber like hose and metal clamps to facilitate removal for inspection or repair. The exhaust conduit 93 is made of metal as it is in contact with high exhaust temperatures.
Up to this point, the operation of the turbocharger is standard in that the gases emanating from the exhaust manifold 16 at section 32 are directed against the blades 112 of rotor 108 thereby imparting rotation to the rotor 108, such rotation causing rotor 106 to rotate with the blades 110 drawing atmospheric air through conduit 91 into the rotor housing 102 from where it is discharged through conduit 96 into the intake manifold 14 to increase intake air pressure.
It is known that present day turbochargers are designed in such a manner that no consideration is given to the control and use of the air processed by the turbocharger. A dump valve or wastegate valve is associated with known turbochargers which opens to vent exhaust when too much exhaust is available in the turbocharger. This defect, as is apparent, then places additional strain on the engine in that it causes both the turbocharger and the engine to process unwanted additional volumes of exhaust that are then similarly discharged to the atmosphere via the dump valve or wastegate valve which is normally located in the exhaust manifold prior to the turbocharger. These dump valves or wastegate valves are "pop-off" relief valves actuated by the sensing of excess pressure at the intake of the engine.
Upon actuation, these valves vent exhaust gases to the atmosphere, thereby preventing them from flowing through the turbocharger which would in turn generate additional intake pressures via the turbocharger function.
It has been found that by regulating the exhaust flow exiting the engine, air flow entering the engine and boost pressure produced by the turbocharger can be controlled, and the fuel efficiency of the engine or engine-turbocharger combination will be significantly improved. Exhaust emissions are also substantially reduced as compared to conventional diesel and gas engines because controlled exhaust flow and increased back pressure provide for more complete combustion.
The apparatus for regulating exhaust flow to increase engine back pressure as previously discussed and shown in Fig. 2 is incorporated into the engine-turbocharger combination to increase fuel efficiency and reduce exhaust emissions.
The first test engine-turbocharger combination was a Perkins marine diesel engine with a displacement of 108 cubic inches fitted into the chassis of a 1979 Mercury Capri. All sharp edges or contours of combustion area surfaces of the engine, such as piston top surfaces and surfaces within the cylinder head combustion chamber and preignition chamber, were slightly rounded to reduce the potential of concentrated "hotspots" during operation under leaner fuel ratios. These slight engine modifications were made to extend engine life and do not significantly alter or improve the operation of the engine. The turbocharger attached to the engine was a Rayjay turbocharger, model #3881882581. Total vehicle weight was 3,300 pounds.The fixed venturi system 44 of Fig. 2 was incorporated into the first test engine-turbocharger combination wherein the cross-sectional area of the large opening 48 was approximately 2.1 square inches, and the cross-sectional area of the smaller opening 50 was approximately 0.44 square inches resulting in an approximate 4.7:1 cross-sectional area ratio. The fixed venturi system 44 was secured between mounting flange 34 and flange 88 as shown in Fig. 6 by nuts and bolts 42.
The first test engine-turbocharger combination having the fixed venturi system of Fig. 2 was extensively tested.
Certified Environmental Protection Agency mileage and emissions tests were run with the following results:
Cold start city test: 37.10 miles per gallon
3.40 grams per mile of Carbon Monoxide
0.41 grams per mile of Hydrocarbons
1.00 grams per mile Oxides of Nitrogen
Highway test: 56.23 miles per gallon
2.10 grams per mile of Carbon Monoxide
0.33 grams per mile of Hydrocarbons
0.71 grams per mile Oxides of Nitrogen
At a steady state of 55 miles per hour 63.97 miles per gallon was achieved.
Test results, as shown by the graphs of Figs. 9 and 10, indicate that the exhaust manifold back pressure and intake manifold boost pressure can be significantly altered by the fixed venturi system 44. Increased back pressures on the engine show additional torque (horsepower) gains in the lower RPM ranges on both naturally aspirated and turbocharged engines. Horsepower gains are slightly higher in forced air induction system applications due to the added effect of slightly increased boost pressures at lower RPMs.
Test results, however, indicate that engine output horsepower is not dramatically affected with back pressures exceeding 2 atmospheres, and lower RPM boost pressures can be increased while flattening the upper RPM boost pressure curve as shown in Fig. 11.
The ratio of boost pressure to back pressure varies during the several operational conditions including maximum acceleration, maximum deceleration, and idle. As shown in Fig. 11, the maximum boost pressure to back pressure ratio for the first test engine-turbocharger combination operating at maximum acceleration was approximately 0.27.
The variable orifice venturi system 44 of Figs. 3 and 4 may also be incorporated into the engine-turbocharger combination by forming the free end 86 of conduit section 84 of the turbocharger shown in Fig. 6 into a rectangular free end 86 having a rectangular flange 88 to complementally join with rectangular mounting flange 60 by nuts and bolts 68 as shown in Fig. 3. As shown in Fig. 6, the variable orifice venturi system 44 includes a fixed side 70 integrally formed with the turbocharger free end 86, movable side 72, and additional elements as previously discussed. At higher engine RPM, the orifice formed by the fixed side 70 and the movable side 72 will be larger than when operating at a lower RPM, except in the case where boost pressure begins to exceed an upper control limit predetermined by engine and turbocharger parameters. When boost pressure approaches the upper control limit the opening action of the variable orifice venturi system 44 is retarded, and is reversed as the boost pressure meets the upper control limit. This closing of the variable orifice venturi system 44 further increases back pressure on the engine, thereby reducing exhaust flow, which in turn slows the turbocharger rotation resulting in reduced boost pressure and eliminating the need for a dump or wastegate device.