Abstract: A two cycle internal combustion engine with improved cylinder scavenging. The described engine embodiment is a baffled piston two cycle internal combustion engine whose power is substantially increased by directing fuel mixture in the normally spent gas filled region behind the piston baffle during each intake-exhaust portion of the engine cycles to scavenge spent gas from this region and increase the total volume of fuel mixture in the cylinder at the time of ignition. According to the preferred practice of the invention a portion of the fuel mixture displaced from the engine crankcase to the cylinder intake port or ports is diverted to auxiliary ports in the cylinder wall which direct the mixture against the rear side of the piston baffle to effect through scavenging of the region directly behind the baffle.

Abstract: A system for controlling exhaust gas recirculation in an internal combustion engine, comprising means for performing exhaust gas recirculation in a first required value when an engine temperature is at a first predetermined level or higher, means for stopping exhaust gas recirculation when said engine temperature reaches a second predetermined level or lower, the second predetermined level being lower than the first predetermined level, and means for performing exhaust gas recirculation in a second required value which is lower than the first required value, within a temperature range between first and second predetermined levels, the second required value increasing as a function of the engine temperature in response to increase in the engine temperature, thereby preventing exhaust gas recirculation from being abruptly carried out in large amounts so as to improve the driveability of a motor vehicle on which the engine is mounted.

Abstract: An apparatus is proposed which serves the purpose of controlling the exhaust gas recirculation quantity and the injection quantity in auto-igniting internal combustion engines. In this apparatus, an arbitrarily actuatable throttle valve is provided in the intake manifold, downstream of which a control pressure is withdrawn from the intake manifold and used to actuate a pneumatic adjustment device which determines the position of the quantity adjustment device of a fuel injection pump. This control pressure simultaneously serves to actuate an exhaust gas recirculation valve and acts counter to the force of a restoring spring in the work chamber of a second pneumatic adjustment device.

Abstract: An exhaust gas recirculation system for an internal combustion engine includes an exhaust gas recirculation passage for communicating an exhaust port with an intake passage through a recirculation flow control valve. The recirculation system according to the invention comprises a timing valve in the recirculation passage adapted to open at specified moments for extracting exhaust gases containing highly concentrated hydrocarbons. According to the invention, moreover, the exhaust port is concentrically divided into a plurality of ports to extract exhaust gases having high concentrations of hydrocarbons from the outermost divided port adjacent to the inner peripheral walls of the exhaust port to recirculate them into intake mixtures, thereby reducing the concentrations of hydrocarbons and nitrogen oxides in exhaust gases and thus fuel consumption.

Abstract: An engine rotation speed control system for automotive vehicles having internal combustion engines comprises a solenoid actuated valve having a solenoid coil for controling the flow of air through a throttle bypass passage to the intake manifold during engine idling upon energization of the solenoid coil. The electrical circuit for the solenoid coil is provided with a variable resistance arrangement so that sufficient current will be supplied to the solenoid coil upon engine starting in spite of a voltage drop in the battery at cold temperatures.

Abstract: Under light load condition wherein only selected cylinders are fired or operate, low temperature exhaust gas gathering in an exhaust chamber for the unused cylinders is introduced into an intake chamber for the firing cylinders thereby to allow the firing cylinders to produce a less amount of NO.sub.x.

Abstract: An exhaust gas recirculation control system for an internal combustion engine of a motor vehicle, comprising an exhaust gas recirculation control valve for controlling exhaust gas recirculated back to the engine when opened, and means for fully opening the exhaust gas recirculation control valve for a predetermined period of time when operating condition of the vehicle reaches a predetermined level, thereby preventing exhaust gas recirculation from performing with a delayed time relative to a required timing.

Abstract: An apparatus is proposed which serves the purpose of load-dependent actuation of an adjustment device, wherein the cross section and/or the pressure drop of an exhaust recirculation line in an internal combustion engine can be varied in accordance with load. An injection pump of conventional design is associated with the internal combustion engine and further includes a quantity adjustment device, the position of which acts as a control variable for the load. With this control variable, a booster apparatus is controlled via a comparison apparatus; the output variable of the booster apparatus in turn is the control variable for the actuation of an adjustment device which acts on an exhaust recirculation control apparatus. When a threshold value for load is exceeded, the exhaust recirculation is precluded. The control variable is preferably formed as a fuel pressure signal with the fuel withdrawn from the suction chamber of the injection pump.

Abstract: Disclosed is a fuel supply device for a diesel engine comprising alternately connected to a diesel engine a light fuel loop and a heavy fuel loop incorporating a tank and a fuel priming pump, the loops communicating with a suction pipe of the diesel engine via a system of stop valves. The light fuel loop is in communication with the diesel engine. The system of stop valves comprises a logical element "OR", the output thereof being connected to the suction pipe of the diesel engine, a pressure controller connected to the first input of the logical element "OR", a flow switch valve having its input connected to the second input of the logical element "OR" and to the fuel priming pump of the heavy fuel loop. The output of the flow switch valve communicates with the tank of the heavy fuel loop.

Abstract: An internal combustion engine 10 wherein no compression function is carried out in the engine 10 and including a tank 30 of compressed air, a pressure regulator 34, a fuel injector 28, and means 40 and 42 for connecting the pressure regulator 34 and the fuel injector 28 to a foot pedal 38 for controlling air and fuel feed to the combustion chambers 22 in response to throttle demand. The engine can use spark or compression ignition and can provide full expansion. Compressed air can be generated more efficiently using central station power with a vast savings in the amount of oil consumed. The internal combustion engine system of this invention is useful in all applications for such engines including vehicles such as automobiles, trucks, locomotives, marine applications, airplanes, etc. as well as non-vehicle use.

Abstract: An automotive type carburetor is provided with a choke construction that assures opening of the choke valve without the use of vacuum in the event of an electrical failure in the choke assembly, or a failure in the secondary air pump system of the engine; the choke housing being supplied with hot air under pressure from the engine secondary air pump to warm the choke bimetal, the choke assembly also including a PTC heater element to independently warm the bimetal, either heating means being adequate to assure opening of the choke valve within a desired time in the event of a failure of the other heating means.

Abstract: A two stroke internal combustion engine with at least one dual piston, the cylinders of which are connected to each other by a combustion chamber on the cylinder head side. The engine can be charged on the crank chamber side with an air or air/fuel mixture by a turbo or supercharger. Both the leading and trailing pistons of the dual piston construction control the process of transfer of the air or air/fuel mixture through a transfer port from the crank chamber side of the cylinders to the combustion chamber side of the cylinder for the trailing piston as well as the exhaust process such that the exhaust process begins before the initiation of the transfer process. The engine can operate on either the Otto or Diesel cycles and use multiple fuels.

Abstract: An internal combustion engine is disclosed which includes a plurality of cylinders split into first and second groups and operates in a split cylinder mode under low engine load conditions where the second group of cylinders are held inoperative and have their intake and exhaust ports connected to each other. Means is provided for preventing exhaust gases discharged from the second group of cylinders from mixing with exhaust gases discharged from the first group of cylinders during the split cylinder mode of operation.

Abstract: An exhaust gas recirculation control system for a compression-ignition internal combustion engine or diesel engine including an intake throttle valve in an intake passage and an exhaust gas recirculation passage opening downstream of the intake throttle valve, comprises a shut-off valve in the exhaust gas recirculation passage so that the shut-off valve is closed in the proximity of a full load region of the engine.

Abstract: An exhaust-gas-recirculation system for use in diesel engines, having a valve member adapted to control the flow rate of the exhaust gas recirculated from the exhaust pipe to the intake pipe of the diesel engine. The exhaust-gas-recirculation system has a fly-weight rotatable in synchronization with the engine to produce a centrifugal force, a governor sleeve displaceable in response to a thrust thereon given by the fly-weight, a control spring counteracting the thrust on the governor sleeve and having a spring load changeable in response to the change in the amount of depression of an accelerator pedal, and an actuator operative in response to the displacement of the governor sleeve to actuate the valve member.

Abstract: The thermal and vacuum tracking carburetor Jet is a variable size jet. The opening size is continuously controlled by a thermal spring transducer measuring the temperature of the exhaust gasses, and by a vacuum diaphragm transducer measuring the vacuum within the intake manifold of the engine. When exhaust gasses become too hot indicating too lean a fuel mixture the thermal spring expands opening the jet; if the gasses are too cool the spring contracts and via mechanical linkage, the jet closes. When engine vacuum falls indicating more of a load is placed on the engine the vacuum diaphragm transducer opens the jet providing a richer mixture; when vacuum rises indicating a lessened load or deceleration the jet closes producing a leaner mixture.

Abstract: Two-cycle internal combustion engines are disclosed incorporating intake and transfer ports and passages, and including passages means in the cylinder wall interconnecting the intake tract and a transfer passage in a region above the piston when the piston is in bottom dead center position.

Abstract: An intake port means for extracting engine exhaust gas for recirculation having an extracting aperture placed in a stream of the engine exhaust gas and a cover having its closed end lying on the upstream side of said aperture while having its open end facing the downstream side from said aperture, so that the engine exhaust gas is extracted through trailing portion of the open end of the cover.

Abstract: A two-stoke cycle combustion-engine with crank-chamber compression is described, free of charging transfer passages external to the cylinder, with pumping-displacement exceeding working-displacement for responsive intake and thorough scavenging of spent-gas residue, and featuring an annular water-cooled cell, suspended from the cylinder-head by several water-conduits, and cooperating with an annular recess in the piston-head so as to form, and transversely separate, a plain working-chamber and an annular working-chamber, longitudinally scavengeable in series, bottom-to-top and top-to-bottom, respectively, with minimal loss of charge to exhaust-port, such a system of scavenging also reducing piston cooling-problems and misfiring associated with charge-dilution (in gasoline-engines operating under partial-charge conditions). In addition, a more general scavenging principle is enunciated and claimed, applicable to rear-compression and separately-scavenged two-stroke engines.

Abstract: A compensating member is provided in a conventional automotive engine carburetor, which is used with an electronic closed loop control system, in order to finely adjust a rate of air flow being delivered to a fuel passage extending between a discharge nozzle and a float bowl, and thereby performing a fine adjustment of an air-fuel mixture ratio to effectively reduce noxious components in exhaust gases.