Abstract: The invention concerns a device for controlling the vehicles fuel-air mixture by regulating the air in the ventilation passage leading to the engine air intake from the crankcase. In a vehicle provided with a PCV valve, the device is located in the ventilation passage leading from the crankcase to the engine air intake and the device is downstream of the PCV valve. The device admits outside air to the ventilation passage to lean the gas mixture when the engine creates a vacuum less than 8 PSI in the ventilation passage.

Abstract: In combination with a standard carburator for an internal combustion engine having a butterfly type throttle valve, a means is provided having a passageway with another butterfly type valve and the means is disposed between the carburator and the engine wherein the added valve rotates about an axis disposed normal to the axis of rotation of the throttle valve. Linkage means are provided so that both valves open and close together. A cylindrical chamber is provided with one end opened to the atmosphere and a piston is disposed slideably therein. A compression spring within the chamber urges the piston towards the open end to seat against an internal shoulder formed in the cylinder. Two ducts are provided whereby one end of each duct communicates with the passageway in the means, upstream of the valve therein, and one end of the other duct communicates with the passageway downstream of the valve.

Abstract: An air-fuel mixture control valve assembly for automotive vehicles comprises a valve member which is capable of controlling the opening-closing operation of an air admission passage connected to an intake manifold and a one-way disc valve which is disposed in the air admission passage to prevent the possible adverse current of a high pressure and high temperature fluid within the valve assembly, whereby the air is supplied to the intake manifold upon the sudden deceleration of the vehicle to thereby prevent possible generation of various pollutants.

Abstract: The invention provides a method of, and apparatus for, controlling the fuel to air ratio of the fuel mixture to an internal combustion engine which includes a fuel mixture feed system having a known type of carburettor. In the method the fuel mixture is supplemented with air and exhaust gas by utilizing pressure controlled air and exhaust gas valves operated by pressure changes in the fuel feed system and/or intake manifold of the engine so that the valves open when the fuel to air ratio of the fuel mixture supplied by the carburettor is in excess of a predetermined value.

Abstract: An exhaust gas purifying system for an internal combustion engine including at least one combustion chamber connected to an intake port through an intake valve. The system comprises a first passage for passing a portion of exhaust gases discharged from the combustion chamber, a second passage for passing air, a fluid passage, at least one fluid injection nozzle having its one end connected to the fluid passage and the other end extending into the intake port toward the combustion chamber, the fluid injection nozzle adapted to open when the intake valve opens, and means responsive to engine operating condition for connecting the fluid passage to the first passage to permit injection of exhaust gases through the fluid injection nozzle into the combustion chamber during acceleration and for connecting the fluid passage to the second passage to permit injection of air through the fluid injection nozzle into the combustion chamber during normal operation or idling.

Abstract: A compound valve device comprises a body member, a first valve member being located in the body member and controlling the fluid communication between a first input port and a first output port, and a second valve member being located in the body member and controlling the fluid communication between a second input port and a second output port. The two valve members operate in sequence, without a significant difference in time in response to one signal pressure.

Abstract: A four cylinder spark ignition internal combustion engine has an exhaust emission control system including means for admitting fresh air into the exhaust system in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, this means include a "reed" valve connected to the exhaust ports leading from the first and fourth cylinders (numbering from one end of the engine) through internal passages within the cylinder head; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine taking exhaust gases from branches of the exhaust manifold carrying exhaust gases from the second and third cylinders; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburettor during engine overrun conditions e

Abstract: An anti-after burn system for an internal combustion engine has an air passage for feeding an additional air into the engine intake manifold and a valve member disposed in the air passage for the control of the supply of the additional air to the engine. The valve member is actuated by a valve actuator having a diaphragm disposed between two vacuum chambers one of which is pneumatically connected to the intake manifold and the other is communicated with the one chamber through a restricted orifice formed in the diaphragm. When the difference in pressure between the vacuum chambers exceeds a predetermined value, the valve member is opened to allow air to flow into the intake manifold for a time period.

Abstract: A time delay valve used in vacuum systems of internal combustion engines to significantly reduce exhaust emission pollutants. The valve includes a resilient valve disk with an orifice therethrough. An enlarged cavity is provided adjacent the valve disk into which either a spacer ring or spring may be inserted. In one mode, with the spacer ring inserted, the time delay valve regulates the change rate of both vacuum increase and vacuum decrease across the valve. In an alternative mode with the spacer ring replaced by a spring, the time delay valve regulates only the change rate of vacuum increase across the valve.

Abstract: In an exhaust gas cleaning system wherein secondary air is supplied into the exhaust passage to re-burn the unburnt harmful component in the exhaust gases, a secondary air controlling apparatus for an internal combustion engine is provided. At deceleration of the vehicle, secondary air is interrupted from being fed into the exhaust passage, and is introduced into the intake passage to prevent after-burning in the exhaust cleaning system. When the ignition key is switched off, secondary air is fed into the intake passage to prevent the unburnt gas from flowing out into the exhaust passage. This effect is attained by using a valve operated in response to the negative pressure in the intake pipe to protect the exhaust gases cleaning system and to clean the exhaust gases.

Abstract: An exhaust emission control system for a spark ignition internal combustion engine comprises a first pressure sensitive valve for recycling a proportion of the exhaust gases from the exhaust to the induction when the engine is warm, being inhibited when the engine is cold, valves for admitting a small amount of fresh air to the exhaust manifold, a second pressure sensitive valve for admitting fresh air to the induction manifold downstream of the carburettor when the engine is warm, being closed when the engine is cold and when the starter motor is energized, a first fuel/air mixture enrichment valve in the carburettor sensitive to induction manifold pressure and de-sensitized when the engine is cold, a second fuel/air mixture enrichment valve sensitive to induction manifold pressure and de-sensitized when the engine is hot, and a vacuum advance delay which is by-passed when the engine is warm.

Abstract: A spark ignition internal combustion engine having an exhaust emission control system including an air pump driven by the engine to pump fresh air directly into the exhaust duct in order to promote a further combustion of partly burnt components in the gases coming from the combustion chambers, excess air pressure being released by a pressure relief valve into an air filter for the induction air; the system also comprises an exhaust gas recirculating system comprising a pneumatic valve which opens, when the conditions are appropriate, to draw off a proportion of the exhaust gases from the exhaust side of the engine and admit them to the induction side of the engine; in addition there is a system for admitting supplementary air to the induction manifold downstream of the carburettor during engine overrun conditions except when the engine is cold, and the carburettor is provided with supplementary pumps and valves which only function when the engine is cold, being inhibited as the engine approaches its normal w

Abstract: A system for controlling the quantity of intake air for an internal combustion engine in response to changes in air density employs a supplementary air intake passage connecting the main air intake passage on the downstream side of the carburetor throttle valve with the atmosphere. An atmospheric pressure compensation valve controls the open cross-sectional area of the supplementary air passage in response to changes in atmospheric pressure. In addition, a vacuum responsive control valve controls the open cross-sectional area of the supplementary air intake passage to pass an amount of air through the supplementary passage proportional to the amount of air passed through the main air intake passage.

Abstract: An exhaust gas recirculation system for an internal combustion engine employs a recirculation control valve in a passageway connecting the engine exhaust passage to the engine intake passage downstream from the throttle valve. An air conduit having an air control valve therein furnishes atmospheric air to the intake passage downstream from the throttle valve. Vacuum responsive actuators are provided for each of the control valves and they are operated by vacuum pressure regulated by a regulating valve, which regulating valve is responsive to differential pressure between vacuum intensity in the intake passage upstream from said throttle valve and modified atmospheric pressure. The modified atmospheric pressure is obtained downstream of a restriction in the air conduit.

Abstract: An auxiliary air delivery system for an internal combustion engine includes an intake vacuum sensor for generating an intake vacuum signal, a deceleration sensor and a microcomputer in which is stored a set of data representing different values of reference intake vacuum and programmed to retrieve a datum as a function of the length of time from the occurrence of engine deceleration. The retrieved information is used a reference signal with which the intake vacuum signal is compared to provide a control signal. A servo mechanism is provided to allow auxiliary air to be admitted into the manifold at a point downstream of the nearly closed throttle in response to the control signal to reduce the difference between the actual intake vacuum and the reference intake vacuum.

Abstract: A system for controlling the amount of air taken in by an engine comprises an air duct tube bypassing a throttle valve of an intake tube for taking in air supplied to an automobile engine, a plurality of valves for regulating the amount of air passing through the air duct tube, and control device therefor. The amount of air in the bypass is controlled in accordance with the temperature and number of revolutions of the engine and the air intake pressure downstream of the throttle valve. During the idling of the engine, the air intake control system generates a signal representing the standard engine idling revolutions in accordance with the engine temperature, compares the actual engine revolutions with a reference, and regulates the amount of air flowing in the bypass by use of the results of a comparison, thus rendering the actual engine revolutions identical to the reference.

Abstract: The invention relates to a subpressure limiter for a fuel injection system of a mixture compressing, externally ignited internal combustion engine wherein the apportioned fuel quantity is injected into the suction tube containing an arbitrarily actuatable throttle valve, and wherein the suction tube sections upstream and downstream of the throttle valve are interconnected by means of a bypass whose cross-sectional area is variable by means of the subpressure limiter and features a pressure dependent control element responding to the subpressure prevailing within the suction tube section downstream of the throttle valve during an overrunning operation.

Abstract: In a carburetor for an internal combustion engine having a primary air passage with an air valve therein and a fuel inlet port, an improvement comprising, a valve needle member having a portion extending into the fuel inlet port to a selected extent for varying the flow of fuel through the fuel inlet port and into the primary air passage. A secondary air passage is defined within the valve needle member to provide a secondary flow of air into the primary air passage. The secondary flow of air enhances mixture of the fuel and further regulates the flow of air in the primary air passage. A secondary air passage regulating body is resiliently held within the secondary air passage to selectively restrict the flow of air within the secondary air passage depending upon the position of the air valve in the primary air passage to at all times provide the proper flow of air within the primary air passage to induce full combustion of the fuel entering through the fuel inlet port.

Abstract: A valve is disclosed which is designed for injecting air into an internal combustion engine fuel/air inlet system under controlled conditions, i.e., no air is injected in the engine idle phase (typically under high manifold vacuum from 17 to 20 inches of mercury (in. Hg)). Air injection takes place by means of this valve as a differential function of manifold pressure which is related to throttle opening, (typically starting at about 16 in. of Hg and fully open to atmospheric air at about 8 to 10 inches of Hg, corresponding to open throttle conditions at normal vehicle cruise. The injection valve disclosed herein is designed for installation in series with the engine crankcase scavenging hose on the manifold side of the pollution control valve (PCV). Air flow through the manifold injection valve is controlled by a spring loaded piston and cylinder assembly which is actuated by a vacuum control hose connected to a take off point on the engine inlet manifold.