Abstract: A noise attenuating tube mounted in an engine compartment air intake hood duct of a motor vehicle to attenuate engine air intake noise in the hood is disclosed.

Abstract: An air cleaner has a casing having an air inlet and an air outlet with an air filter therebetween. A sump with a drain hole is formed in the casing between the filter and outlet. A valve opens the drain hole to drain the sump in response to the collection of a predetermined amount of liquid thereabove in the sump collected from air passing from the filter to the outlet. And an air filter filters any air passing through the drain hole from outside the casing should the valve open while air is passing from the normal inlet to the outlet.

Abstract: An engine air cleaner is disclosed having a housing with an inlet and an outlet and a filter therebetween. A vacuum chamber is formed in the housing so as to surround the inlet, outlet and filter and is connected to an engine intake manifold so as to establish a subatmospheric pressure therein to thereby vacuum insulate the air cleaner for both heat transfer and noise attenuation with respect to the air passing therethrough.

Abstract: In a dual displacement internal combustion engine which operates on four cylinders at selected times and eight cylinders at other times, the air induction passage creates a subatmospheric pressure signal which is higher during the four cylinder mode than during the eight cylinder mode. An exhaust gas recirculation control valve is operated from that pressure signal, and a solenoid valve opens a port from the atmosphere to increase the pressure signal when operating on eight cylinders to provide similar operating pressure under both modes of operation.

Abstract: An air control valve for use in the exhaust emission control system of an internal combustion engine as used for example, in a vehicle, the air control valve, which is adapted to perform three functions, includes a divert timing switching diaphragm assembly which provides the standard diverter valve function during engine warmup and also controls port air injection during all mid-power conditions, a second diaphragm valve assembly that is operative to provide for secondary air by-pass during high engine load or power operating conditions and, a third diaphragm valve assembly adapted to provide secondary air by-pass during low engine load or vehicle cruise conditions.

Abstract: In an evaporative emission control system for a vehicle, the flow of fuel vapor from the fuel tank to the vapor storage canister in the system is controlled by a vapor flow control valve having a housing with a chamber therein in flow communication with the fuel tank to receive fuel vapor therefrom this chamber being connected to the vapor storage canister by a first vapor passage means and by a second vapor passage means, with flow from the chamber through the first vapor passage means being controlled by a diaphragm valve means that is normally biased closed by a spring, and which is responsive to either engine vacuum on one side thereof or to a predetermined fuel vapor pressure on its opposite side whereby to permit vapor flow and, the second vapor passage means including a sized bleed orifice passage used to control the rate of vapor flow to the storage canister via this second vapor passage means.

Abstract: An electric-thermal switch valve has a body with a first port and at least one second port with a temperature operated valve means including a valve seat and a bimetal element, responsive to temperature, positioned to cooperate with the valve seat to control flow between the first port and the second port. An electrical heating means, including a semi-conductor, having a positive temperature coefficient of resistance, positioned in the body, is used to heat the bimetal element when energized whereby switching of the bimetal element at a predetermined temperature, will occur as the combined effect of heat sensed by the body and the heat generated by the electrical heating means.

Abstract: An altitude compensated purge valve is connected in parallel with the vacuum actuated purge valve in the evaporative emission control system for a vehicle engine whereby to control as a function of ambient pressure the purging of fuel vapors from a fuel vapor storage canister into the vehicle engine for combustion therein. The altitude compensated purge valve includes an aneroid actuated tapered valve to variably control the flow area through an inlet passage from the canister for controlling vapor purge therefrom to a common fuel vapor line connecting both the vacuum actuated purge valve and the altitude compensated purge valve to the induction system of the engine.

Abstract: In an engine having a pump for delivering air to the exhaust system to support oxidation of exhaust gases, a valve opens when air delivered by the pump exceeds a selected temperature to bleed air from the pump into the vacuum chamber of a diaphragm operated valve. In one embodiment the valve diverts air from the exhaust system to relieve the backpressure on the pump, while in another embodiment the valve closes an exhaust gas recirculation passage to improve efficiency of operation.

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.