Abstract: The object of the invention is to suppress the generation or accumulation of deposits in a compressor of a turbocharger of an engine provided with a blowby gas recirculation device. The invention relates to a cooling device for the turbocharger (60) of the engine (10) provided with the blowby gas recirculation device (50). The cooling device has a cooled air introduction passage (70). The blowby gas recirculation device introduces a blowby gas to an area upstream of the compressor. The cooled air introduction passage introduces a cooled air to a diffuser passage (64) of the compressor. The cooled air introduction passage introduces the cooled air to the diffuser passage in a direction having an acute angle with respect to a flow direction (IA) of the intake air flowing through the diffuser passage.

Abstract: A pressure accumulation system for an internal combustion engine can prevent exhaust pressure from excessively increasing when pressurized gas is contained in a pressure accumulation container. A pressure accumulation system is applied for an internal combustion engine provided with an exhaust shut-off valve mounted in an exhaust path. The pressure accumulation system has a pressure accumulation tank into which gas can be introduced from that portion of an exhaust path. The pressure accumulation system also has a sensor for detecting the exhaust pressure, and an EGR valve is controlled based on the detection value from the exhaust gas sensor such that the pressure in that portion of the exhaust path which is on the upstream of the exhaust shut-off valve is limited below a predetermined exhaust gas upper limit value (Pmax) when gas is contained in the pressure accumulation tank.

Abstract: A supercharging system comprising a pressure wave supercharger which supercharges an internal combustion engine by increasing a pressure of gas in a cell using a pressure wave of exhaust gas and discharging from an intake gas outlet port to an intake gas passage the gas pressurized further comprises a first motor which rotates a rotor, and a valve plate and a second motor capable of changing a position of the intake gas outlet port with respect to an exhaust gas inlet port. The motors are controlled so as to change a rotation number of the rotor and the position of the intake gas outlet port with respect to the exhaust gas inlet port based on a quantity of flow of exhaust gas to be recirculated to the intake gas passage.

Abstract: A supercharging system for an internal combustion engine comprising a turbocharger including a compressor and a turbine, and a pressure wave supercharger performing supercharging of the internal combustion engine by increasing a pressure of gas led into each of cells from an intake gas inlet port using a pressure wave of exhaust gas led into the cell from an exhaust gas inlet port and discharging from an intake gas outlet port to an intake passage the gas pressurized, wherein a case of the pressure wave supercharger is connected to the intake passage upstream of the compressor via the intake gas inlet port, and is connected to the intake passage downstream of the compressor via the intake gas outlet port, and is connected to an exhaust passage downstream of the turbine via the exhaust gas inlet port and an exhaust gas outlet port.

Abstract: In an internal combustion engine provided with a rotary intake control valve, preferable position convergence at the end of inertia supercharging is ensured while avoiding an influence on combustion performance. In an engine provided with an impulse valve, if the implementation of the inertia supercharging is stopped and a request to maintain the impulse valve at a fully-opened position is made, an ECU stops the supply of a braking force to the impulse valve until the rotational phase of the impulse valve enters dead band, and the ECU performs a BRK mode for stopping the impulse valve under the condition that the rotational phase enters the dead band and that the impulse valve is in a deceleration state. At this time, electrification or power distribution for acceleration of the impulse valve during stop control of the impulse valve is forbidden.

Abstract: A pressure accumulation system for an internal combustion engine can prevent exhaust pressure from excessively increasing when pressurized gas is contained in a pressure accumulation container. A pressure accumulation system is applied for an internal combustion engine provided with an exhaust shut-off valve mounted in an exhaust path. The pressure accumulation system has a pressure accumulation tank into which gas can be introduced from that portion of an exhaust path. The pressure accumulation system also has a sensor for detecting the exhaust pressure, and an EGR valve is controlled based on the detection value from the exhaust gas sensor such that the pressure in that portion of the exhaust path which is on the upstream of the exhaust shut-off valve is limited below a predetermined exhaust gas upper limit value (Pmax) when gas is contained in the pressure accumulation tank.

Abstract: In an internal combustion engine, it is first determined whether a load factor of the internal combustion engine is a specified value or more and the engine speed of the internal combustion engine is a specified speed or less. If these conditions are satisfied, fuel is injected from both of a port injection valve and a direct injection valve, and a fuel injection timing of the direct injection valve is decided so as to inject fuel from the direct injection valve during the compression stroke of the internal combustion engine.

Abstract: In an internal combustion engine, it is first determined whether a load factor of the internal combustion engine is a specified value or more and the engine speed of the internal combustion engine is a specified speed or less. If these conditions are satisfied, fuel is injected from both of a port injection valve and a direct injection valve, and a fuel injection timing of the direct injection valve is decided so as to inject fuel from the direct injection valve during the compression stroke of the internal combustion engine.

Abstract: In a fuel discharge preventive device of a gas engine, in order to prevent high-pressure gaseous fuel remaining in a fuel distributing pipe when an engine is stopped, from leaking out of a gaseous fuel injection valve to be discharged to the open air, a fuel shut-off valve is provided in a fuel feed passage through which gaseous fuel is fed to the gaseous fuel injection valve, and a suction passage communicating with a gaseous fuel storing portion is branched off from the fuel feed passage between the gaseous fuel injection valve and the fuel shut-off valve, so that the gaseous fuel in a potion of the fuel feed passage located between the gaseous fuel injection valve and the fuel shut-off valve is stored in the gaseous fuel storing portion after the engine is stopped and hence the fuel shut-off valve is closed, while the stored fuel is purged to the engine when the engine is being operated.

Abstract: A two stroke engine equipped with a mechanically driven supercharger in the intake passage downstream of throttle valve. A bypass air passage bypassing the supercharger is provided, and a bypass air control valve is arranged in the bypass air passage. When the engine is idling, the bypass air control valve is controlled so that the level of vacuum in the intake passage between the throttle valve and the supercharger is maintained at a constant value.

Abstract: A fluid pump having a housing, a pair of rotors, a pair of rotor shafts for supporting the rotors in the housing, identical mating gears provided on the rotor shafts, and rotary drive for rotating the rotor shafts to rotate the rotors, and comprising a one-way clutch operatively connecting the rotary drive to the rotor shaft, a multiple-disc clutch operatively connecting the rotary drive to the other rotor shaft, and coils for generating a magnetic force by which the multiple-disc clutch is activated. When the multiple-disc clutch is not activated, rotation of the rotary drive is transmitted to the rotor shaft through the one-way clutch, and when the multiple-disc clutch is activated by the coils, rotation of the rotary drive is transmitted to the other rotory shaft through the multiple-disc clutch. By activating or inactivating of the multiple-disc clutch, it is possible to change the drive-driven relationship between the rotor shafts, so that a nonuniform wear of the mating gears is eliminated.

Abstract: An electromagnetic coupling selectively transmits power from an automobile engine to a supercharger. The electromagnetic coupling includes a rotor having excitation coils thereon and rotatable by the drive source, an armature magnetically attractable in a direction toward the rotor for rotation therewith in response to energization of the excitation coils, an outer holder plate mounted on the armature and having a first flange, an inner holder plate connected to the supercharger and disposed radially inwardly of the outer holder plate, the inner holder plate having a second flange positioned concentrically with and spaced from the first flange, and an elastomeric member disposed between and joined to the first and second flanges. The elastomeric member has a thickness in the direction toward the rotor which is progressively increased from the second flange toward the first flange.

Abstract: A Roots pump having a plurality of rotor assemblies each including a light-alloy rotor, a steel shaft press-fitted in a bore of the rotor and a lock pin which is inserted through the rotor and the shaft to prevent removal of the shaft from the rotor. The lock pin is located substantially at an axial center of a press-fitted portion of the shaft accommodated the axial bore. The shaft has a timing gear at one end thereof for meshing with a timing gear of the shaft of the adjacent rotor assembly. The shaft further has a plurality of engagement teeth provided at one of opposite ends of the press-fitted portion on the side of the timing gear. The engagement teeth are at least partially embedded in an inner surface defining the axial bore of the rotor, upon press-fitting of the press-fitted portion in the axis bore, to thereby prevent a rotational movement of the shaft relative to the rotor.

Abstract: A pressure controlling device for controlling pressure acting on end faces of bearings in a Roots blower type supercharger. An end portion of a shaft having an impeller projects through an inner wall of a housing of the supercharger, and is rotatably supported by a bearing provided outside of the inner wall. An annular space is formed the bearing and the inner wall. The annular space is communicated with the atmosphere through an air passage which is connected to a control valve. The control valve closes for a predetermined period after the engine load becomes higher than a predetermined value.

Abstract: An apparatus for controlling the proportion of air and fuel in the air-fuel mixture of the internal combustion engine includes a carburetor having a main system fuel tube, a main system air-bleeding passage, a slow system fuel tube and a slow system air-bleeding passage, and a proportional control solenoid valve including an air-inlet port, a first outlet port communicating with the main system air-bleeding passage, a second outlet port communicating with the slow system air-bleeding passage and a moving-coil linear motor incorporated therein, wherein the proportional control solenoid valve is adapted to supply air to the main system air-bleeding passage and the slow system air-bleeding passage at a flow rate proportional to the level of the intensity of an electric current supplied to the moving-coil linear motor when the intensity of the electric current lies within a range between two predetermined values Imin and Imax.

Abstract: An apparatus for controlling the proportion of air and fuel in the air-fuel mixture of the internal combustion engine includes a carburetor having a main system fuel tube, a main system air-bleeding passage, a slow system fuel tube and a slow system air-bleeding passage, and an electromagnetic control valve having an air-inlet port, a first outlet port communicating with the main system air-bleeding passage and a second outlet port communicating with the slow system air-bleeding passage, and internally provided with a moving-coil type linear motor. The electromagnetic control valve is adapted to cause the first outlet port to start to communicate with the air-inlet port a predetermined period of time after the second outlet port has started communicating with the air-inlet port, when an analog electric signal is applied to the linear motor.

Abstract: At least one electrical signal which indicates an operating condition of an internal combustion engine is generated, and then a first air-fuel ratio feedback control system which controls a carburetor air-fuel ratio and a second air-fuel ratio feedback control system which controls the amount of secondary air supplied into the exhaust system is selectively energized so as to function in accordance with the generated electrical signal.