Abstract: An exhaust gas recirculation control assembly senses a throttle position related vacuum signal, an engine speed related pressure, and atmospheric pressure to create a subatmospheric control pressure suitable for actuating a diaphragm operated exhaust gas recirculation control valve.

Abstract: To start an ethanol fueled engine at low temperatures, a valve directs liquid ethanol from the carburetor accelerator pump to a PTC thermistor grid disposed in the engine induction passage below the throttle. The electric grid evaporates the liquid ethanol to provide sufficient ethanol vapor to start the engine and then is deenergized when the engine has started.

Abstract: To start an ethanol fueled engine at low temperatures, a pump sprays liquid ethanol into a PTC thermistor grid disposed in a vaporizer. The electric grid evaporates the liquid ethanol to provide sufficient ethanol vapor to start the engine.

Abstract: To restart an alcohol fueled engine at low temperatures, a quantity of liquid ethanol is supplied to a vaporizing chamber before the engine is stopped. When restarting the engine, some of the alcohol in the vaporizing chamber is delivered to an igniter, and the hot gases resulting from the burning alcohol are conducted past the vaporizing chamber to evaporate the liquid alcohol remaining in the vaporizing chamber. The alcohol vapor thus generated is conducted to the engine induction system to start the engine.

Abstract: An exhaust gas recirculation valve pintle is secured on a hollow valve stem by a radially elastic retaining ring which allows the pintle to be withdrawn from the stem for removal of exhaust gas deposits.

Abstract: An engine charge forming device controls the fuel metering orifice area in proportion to the throttled air flow area of the induction passage and controls the pressure drop across the fuel metering orifice in proportion to a vacuum signal which is substantially independent of the compressibility effects of throttled air flow; fuel flow is thereby proportioned to air flow throughout the range of engine operating conditions. Adjustments are provided for varying the fuel metering orifice area to set minimum and maximum fuel flows, and controls are provided for modifying the vacuum signal to vary air-fuel ratio.

Abstract: A valve controlling the rate of air flow from a supply pump to an engine exhaust system directs the air flow to the exhaust system through an orifice in a diaphragm valve which is associated with a valve seat separating the air supply from an excess air discharge port. The pressures acting on the diaphragm displace the diaphragm from the valve seat the amount necessary for the rate of air flow through the orifice to the exhaust system to be proportional to the rate of exhaust flow through the exhaust system and for the excess air flow supplied by the pump to be discharged through the excess air port.

Abstract: A valve is positioned by a control diaphragm which senses manifold pressure in an automotive engine and by an opposing biasing spring to create a control pressure, and a servo diaphragm positions the throttle in response to variations in the control pressure to thereby maintain the manifold pressure at a value determined by the spring bias. The vehicle operator positions the accelerator pedal to vary the spring bias and thus determine the value at which the manifold pressure is maintained.

Abstract: In an air pump adapted to supply air to an engine exhaust system, an improved seal is provided between the pump housing and its centrifugal filter element.

Abstract: In an internal combustion engine air intake temperature control system a pivotal valve is movable between two extreme positions of angular movement to open one and close the other of a cold air inlet and a warm air inlet to an engine air intake passage, said valve being biased in a direction to close said cold air inlet, and a thermo-responsive device in said intake passage includes an actuator constructed so as, in response to increasing temperature in said intake passage, to engage said valve and move it against said bias to open said cold air inlet and close said warm air inlet, said valve also being movable to open said cold air inlet, against said bias, in response to a predetermined pressure differential across said valve, and said thermo-responsive device including a stop member constructed so that, when the temperature sensed by said thermo-responsive device is below a predetermined value, the stop member is positioned so as to prevent complete closure of said warm air inlet by said valve.

Abstract: A carburetor vacuum break assembly includes a telescopically constructed adjustable stop which permits adjustment of the carburetor choke vacuum break position but does not require an elongated sealing region about the stop.

Abstract: In a vehicle driven by a diesel engine, a sensor is activated by an accumulation of water in the fuel tank and another sensor is activated when the engine temperature is at a level, less than normal operating level, indicating that the vehicle and its fuel tank have been stationary for a period sufficient to permit separation of the fuel from the water in the tank. A solenoid is energized upon activation of both sensors and opens a drain valve to permit the water to be drained from the tank.

Abstract: During operation of an internal combustion engine at low temperatures, the carburetor choke is closed to the extent necessary to provide the fuel which will maintain the mean effective pressure of combustion equal to the mean effective pressure occurring during operation at normal temperatures. The torque produced during low temperature engine operation is thus maintained equal to the torque produced during operation at normal temperatures.

Abstract: In a carburetor, a linear motor assembly urges the metering apparatus against a biasing spring with a force related to the linear motor current, and an adjusting screw grounds a portion of the active turns of the biasing spring to vary its spring rate and thereby establish the position of the metering apparatus and thus the carburetor fuel flow for a selected linear motor current.

Abstract: An engine charge forming device controls the fuel metering orifice area in proportion to the throttled air flow area of the induction passage and controls the pressure drop across the fuel metering orifice in proportion to a vacuum signal which is substantially independent of the compressibility effects of throttled air flow; fuel flow is thereby proportioned to air flow throughout the range of engine operating conditions. Adjustments are provided for varying the fuel metering orifice area to set minimum and maximum fuel flows, and controls are provided for modifying the vacuum signal to vary air-fuel ratio.

Abstract: A carburetor choke plate is rotated by a driver in one direction from its wide open position for cold enrichment and in the opposite direction from its wide open position for stoichiometric air-fuel ratio control. A fast idle cam limits throttle closure during operation in the cold enrichment mode, and a stop limits movement of the main metering rod toward its rich position in the stoichiometric air-fuel ratio control mode. The choke mechanism also positions an idle bleed valve to vary idle air-fuel ratio, and controls a latch to prevent secondary operation, during both the cold enrichment and the stoichiometric air-fuel ratio control modes.

Abstract: A command signal drives a carburetor metering valve to provide the carburetor fuel flow which will establish a desired air-fuel ratio; simultaneously, the command signal drives a control unit which purges fuel vapor from a fuel vapor storage region. The control unit minimizes purge flow when either maximum fuel flow or minimum fuel flow is commanded and maximizes purge flow when an intermediate fuel flow is commanded; accordingly, fuel vapor is purged from the vapor storage region only when the purge flow cannot unduly enrich or unduly lean the mixture.

Abstract: In a vacuum motor for opening an internal combustion engine carburetor choke to a vacuum break position, a stop is engaged between the actuating diaphragm and a base member to establish the vacuum break position. The stop is formed of a malleable material which plastically deforms slightly upon engagement--and thus gradually changes the vacuum break position upon repeated engagement--to compensate for changes in engine operating characteristics over an extended period of engine operation.

Abstract: A connecting rod assembly for a two-stroke cycle reciprocating piston internal combustion engine has the piston pin axis slightly skewed from the crank-shaft axis to provide favorable conditions for lubricating the piston pin.

Abstract: A diaphragm operated valve bleeds air to the induction passage of a turbocharged engine when the pressure increase across the turbocharger compressor exceeds the particularly high value occurring as the engine throttle is moved from a wide open position; the additional air leans the air-fuel mixture delivered to the engine and thereby prevents a brief pulse of engine power which might otherwise occur, minimizes emission of exhaust gas hydrocarbons and carbon monoxide, and avoids exhaust system backfire noise.