Abstract: In an internal combustion engine exhaust gas recirculation control valve assembly having a transducer which converts engine exhaust pressure to a controlled vacuum signal and having a valve pintle positioned in response to the controlled vacuum signal to control the flow of recirculated exhaust gases, an orifice member opens in response to high exhaust pressure to admit air to the transducer and thereby decrease the vacuum signal causing the valve pintle to decrease recirculation of exhaust gases.

Abstract: In a carburetor choke assembly having a coiled bimetal thermostat enclosed between a housing and a cover, the cover is retained on the housing by a plurality of spring clips which are hooked to the housing and have a serrated edge gripping the cover.

Abstract: A control unit creates a control pressure signal which causes a pressure responsive valve assembly to interrupt the flow of secondary air to the exhaust system of an internal combustion engine during prolonged heavy load operation.

Abstract: A fuel deflector and restrictor are disposed in the filler neck of an automobile fuel tank to inhibit filling of the tank with improper fuel. An opening in the restrictor permits insertion of and delivery from a fuel nozzle used with non-leaded fuels, but the restrictor obstructs a larger diameter nozzle used with leaded fuels. A resilient deflector member is cantilevered at one end and is biased toward and partly underlies the acceptance opening. The deflector is moved by the smaller diameter non-leaded fuel nozzle upon insertion, but deflects fuel impinging thereon from the unaccepted leaded fuel nozzle through an aperture in the restrictor to actuate the automatic shut-off mechanism of the leaded fuel nozzle.

Abstract: A carburetor, adapted to supply a lean air-fuel mixture to the main chamber and a rich air-fuel mixture to the auxiliary chamber of a stratified charge internal combustion engine, has an auxiliary induction passage formed as a cylindrical bore. The auxiliary induction passage receives air from the main induction passage through a lateral inlet port. A throttle in the auxiliary induction passage is formed as a hollow cylinder conforming to the cylindrical bore and is axially reciprocable past the port to control flow therethrough. Fuel is introduced into the transfer passage in accordance with air flow therethrough, and idle fuel is introduced directly into the cylindrical bore.

Abstract: In an internal combustion engine carburetor the idle mixture adjusting valve has a tapered metering portion disposed in the idle fuel discharge orifice and a separate closure portion engageable with a seat. A solenoid energized during deceleration moves the valve to engage the closure portion with the seat and interrupt fuel flow through the discharge orifice.

Abstract: In an internal combustion engine carburetor the idle mixture adjusting valve is supported in a guide member. A sleeve slides on the guide member and carries a closure portion engageable with a seat surrounding the idle fuel discharge port. A solenoid energized during deceleration moves the sleeve to engage the closure portion with the seat and interrupt fuel flow through the discharge orifice.

Abstract: In an internal combustion engine air cleaner snorkel having an end open to ambient temperature air and an auxiliary inlet open to heated air, the induction air flow temperature is regulated by a pivoted damper assembly having a guide member positioned by a coiled bimetal and a damper member biased by a torsion spring for concomitant operation with the guide member. The damper member has a main blade portion responsive to the induction air flow rate and controlling ambient air flow and a pair of lateral blade portions controlling heated air flow but unresponsive to the induction air flow rate. Under conditions of high induction air flow the damper member moves away from the guide member against the bias of the torsion spring to permit ambient air flow through the open end and to block heated air flow through the auxiliary inlet.

Abstract: A V-type internal combustion engine has left and right exhaust manifolds interconnected by an exhaust crossover passage and connected by left and right exhaust pipes respectively to a main catalytic converter. The left exhaust pipe has an auxiliary catalytic converter, while the right exhaust pipe has a valve which is closed during engine warm-up. The valve diverts exhaust gases from the right exhaust manifold through the crossover passage to the left exhaust manifold for flow through the auxiliary converter and the left exhaust pipe to the main converter during warm-up and permits exhaust gases to flow directly from the right exhaust manifold to the main converter during normal operation. A pump delivers air into the right exhaust manifold for delivery through the auxiliary converter to the main converter during engine warm-up and for delivery directly to the main converter during normal operation, thus limiting oxidation in the auxiliary converter.

Abstract: In a four-barrel carburetor, a pair of plain tube primary mixture conduits each has a main well receiving fuel through a main jet controlled by a metering rod which is positioned by a vacuum responsive piston. An auxiliary fuel passage receives fuel both through an auxiliary jet controlled by a metering rod positioned by a vacuum responsive piston and through a supplementary jet controlled by a metering rod positioned by an ambient pressure responsive bellows. A pair of transfer passages respectively connect the auxiliary fuel passage to the main wells.

Abstract: A vacuum reducer valve assembly senses the engine induction passage vacuum and delivers a reduced vacuum signal to a vacuum motor which advances the ignition timing in proportion to the vacuum signal. The vacuum reducer valve assembly has a member which decreases the difference between the induction passage vacuum and the reduced vacuum signal as atmospheric pressure decreases.

Abstract: A combustion pressure responsive transducer energizes a solenoid valve assembly which varies an induction passage pressure signal to control a pressure responsive servomotor. The servomotor regulates a combustion parameter to limit peak combustion pressure to a selected value during subsequent combustion events and thus inhibit the formation and emission of oxides of nitrogen. In one embodiment the servomotor regulates the ignition timing, while in a second embodiment the servomotor regulates exhaust gas recirculation.

Abstract: In an internal combustion engine air cleaner, a thermal sensor delivers a vacuum signal to a vacuum motor which actuates a valve unit controlling admission of ambient temperature and heated air. The sensor receives induction passage vacuum and has a bimetal strip which positions an acetal resin valve ball in an air bleed to create a vacuum signal which varies inversely with changes in the induction air temperature, the bimetal strip and valve ball being enclosed within a protective metal housing which permits prompt response to changes in induction air temperature. This construction permits the induction air flow to be maintained at a predetermined temperature.

Abstract: A vehicle fuel tank has a flexible bladder disposed within a metal shell. A vent line extending from within the bladder is controlled by an altitude sensitive valve, and a pressure balance line interconnects the vent line and the space between the shell and the bladder to minimize any pressure differential across the bladder. The bladder contains a fuel level sensor having a float which moves an arm through a vertical path. A fender is suspended within the bladder and is contoured to follow the path of the sensor arm to preclude interference between the bladder and the arm.

Abstract: Spacers formed from mica are disposed in a catalytic converter between a monolithic ceramic catalyst element and a metal converter housing. As the converter warms, the spacers increase the compressive loading on the catalyst element to support and immobilize it within the housing.

Abstract: A gauge for sorting defective cylindrical parts from satisfactory cylindrical parts has an upper plate with a plurality of vertical passages to orient the parts and a lower plate with several vertical bores disposed beneath each of the upper plate passages. The bores in the lower plate allow satisfactory parts to drop through but retain parts which are bent, which have a radially extending burr, or which are otherwise larger in diameter than the bore.

Abstract: In a system for delivering air from an air pump to the exhaust system of an internal combustion engine, an air diverter valve assembly has a regulating control responsive to air pump discharge pressure which positions the diverter valve member to divert excess air flow away from the exhaust system when the pressure exceeds a selected value. The assembly also has a timed anti-backfire provision effective to override the regulating control and divert all air flow to the atmosphere upon a sudden decrease in induction manifold pressure.

Abstract: In an internal combustion engine exhaust system, a catalytic converter mounted on the exhaust manifold has a cylindrical catalyst bed which is disposed on a substantially vertical axis. The exhaust gases flow downwardly into and through a louvered inner tube and then radially through the bed. A frusto-conical baffle is supported from the inner tube and extends outwardly and downwardly into the bed to separate an upper catalyst reservoir portion of the bed from a lower gas flow portion of the bed. During thermal expansion of the bed or upon attrition of the catalyst in the gas flow portion, catalyst beads are discharged from the reservoir portion around the conical baffle and into the gas flow portion.

Abstract: In an emission control system having an air pump for delivering air to the exhaust system of an internal combustion engine, a valve controls the air pump discharge pressure in a fixed relationship to exhaust pressure by diverting a portion of the air pump discharge air flow. As a result, the flow of air from the pump to the exhaust system is maintained as a constant proportion of the engine air flow.

Abstract: In a carburetor having a two-stage power valve and an off-idle air bleed, a lean air-fuel mixture may be supplied when it is desirable to operate in a lean mode for optimizing an exhaust gas oxidizing reactor while a rich air-fuel mixture may be provided when it is desirable to operate in a rich mode for optimizing an exhaust gas reducing converter. In the rich mode means comprising a selectively energizable solenoid control closes the off-idle air bleed and opens the first stage of the power valve thereby enriching both off-idle and open throttle air-fuel mixtures. The power valve is also operated by an induction pressure responsive piston, and at high induction pressures both stages may be opened during lean mode operation and the second stage may be opened during rich mode operation for wide open throttle enrichment.