Mazda Motor Corporation

Toyo Kogyo Co., Ltd.

Madza Motor Corporation

Tomoo Tadokoro

Haruo Okimoto

Ikuo Matsuda

Toshimichi Akagi

Masami Nakao

Hideo Shiraishi

Masato Iwaki

Nobuhiro Hayama

Yasuo Honda

Seiji Tashima

Einosuke Suekuni

Masayuki Kawata

Hiroshi Nomura

Masato Yoshimura

Sadao Matsuoka

Takashi Takeshita

Shinichi Yoshii

Disclosed is an engine-control apparatus in which an exhaust passageway of the engine is provided with plural sound deadening passages. A portion of the plural sound deadening passages is designed to be opened or closed by a shift valve on the basis of a predetermined switching characteristic, and the pressure of the exhaust gases is changed upon the switching of the shift valve. In order to prevent torque shock to the driven wheels which may occur attendant upon operation of the shift valve to open or close or in order to reduce probability that torque shock would occur, there is provided a torque regulating apparatus which permits an adjustment of torque generator by the engine, of a transmission efficiency of power to the driven wheel, or of a switching speed at which the shift valve is switched to open or close, or a change in the switching characteristic.

Engine-control apparatus

A turbo-supercharger for an engine includes a turbine casing formed with two scrolls. A shut-off valve is provided for closing one of the scrolls in a low speed engine operation. The shut-off valve is operated by a pneumatic actuator which is normally biased to force the shut-off valve to the open position. Under a low speed engine operation, the intake suction pressure is applied to the actuator to move the shut-off valve to the closed position.

Control system for a turbo-supercharger of an internal combustion engine

An engine turbo-supercharger including an exhaust gas turbine provided in the exhaust gas passage of an engine, a compressor provided in the intake passage of the engine and adapted to be driven by the turbine, a variable nozzle being provided in the exhaust gas passage upstream the turbine for changing an effective area of the exhaust gas passage leading to the turbine. The variable nozzle has a first position wherein a smaller effective passage area is provided and a second position wherein a larger effective passage area is provided, a bypass passage being provided in the exhaust gas passage and bypassing the turbine, a bypass valve for opening the bypass passage when the intake pressure of the engine increases beyond a predetermined value so that the intake pressure is maintained below the predetermined value. An engine intake gas flow detecting device is provided for detecting a physical value relating to the engine intake gas flow, a control circuit for detecting an engine operating condition wherein the engine intake pressure becomes the predetermined value when the variable nozzle is in the second position and moving the variable nozzle to the second position when the engine operating condition is detected.

Engine turbo-supercharger control

A turbo-supercharger for an engine including a turbine casing of which scroll is formed with two exhaust gas inlet passages. The turbine casing has an inlet end surface connected with the outlet end surface of an engine exhaust pipe. The inlet passages are opened to the inlet end surface of the turbine casing respectively through inlet ports which are arranged in side-by-side relationship. A valve mechanism is provided to close one of the inlet ports under a low speed engine operation. The valve mechanism has a valve member adapted to seat on the inlet end surface and a swingable arm mounted on the exhaust pipe for moving the valve member. The exhaust pipe is formed with a sidewardly bulged portion where the swingable arm is supported. The swingable arm and the valve member are substantially received in the bulged portion in the open position.

Turbo-supercharger for an internal combustion engine

In a supercharged engine, a part of the pressurized air pressurized by a supercharger is introduced into the exhaust system as secondary air in a predetermined operating range of the engine. The supercharging pressure is controlled to be lower when introduction of secondary air is effected than when it is not effected.

Supercharged engine

A two rotor type rotary piston engine includes an intake system comprised of including individual intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and adapted to be cyclically closed by the rotors as the rotors rotate, an intake passage including individual passages leading respectively to the intake ports and opened to a surge tank through openings which are opposed to each other with a spacing therebetween. The overall length of the individual passages and the spacing between the openings is determined with respect to the intake port timings so that a compression wave produced in one individual passage in opening timing of one intake port is transmitted to the other intake port just before the other intake port is closed to obtain an additional charge under a specific engine speed range.

Intake system for rotary piston engines

A fuel injection device for internal combustion engines, provided with a light load fuel injection valve and a heavy load injection valve for each cylinder of the engine. The light load fuel injection valve and the heavy load fuel injection valve are provided in an intake passage. The light load fuel injection valve is positioned close to the combustion chamber of the engine whereas the heavy load fuel injection valve is located further from the combustion chamber than the light load fuel injection valve. The fuel injection device is also provided with a control circuit which controls the light load fuel injection valve to provide additional supply of fuel during engine accelerating operation so that the increased fuel is rapidly introduced into the combustion chamber at the time of engine acceleration.

Fuel injection system for internal combustion engines

A control system for an automobile engine having intake and exhaust systems for respectively conducting intake gases to and exhaust gases from the engine comprises a turbocharger including a turbine disposed in the exhaust system and a blower disposed in the intake system and drivingly connected with the turbine, an exhaust purifying device disposed in the exhaust system downstream of the turbine with respect to the direction of flow of the exhaust gases, a choke valve for varying the effective cross-section of a portion of the exhaust system leading to the turbine, a control device for controlling the choke valve in dependence on an operating condition of the engine, and a correcting unit for controlling the choke valve to increase the effective cross-section during a particular engine operating condition associated with a cold start of the exhaust purifying device. The control device causes the choke valve to increase the effective cross-section during a high speed operating condition, but to decrease the effective cross-section during a low speed operating condition of the engine.

Turbocharged engine with exhaust purifier

For a supercharged internal combustion engine having at least one engine cylinder, a fuel intake system comprises a primary intake passage for supplying a combustible air-fuel mixture to the engine cylinder, and an auxiliary intake passage including a supercharger for supplying at least supercharged air to the engine cylinder, said supercharger being constituted by a displacement air pump and adapted to be driven by the engine such as to produce and supply the supercharged air into the engine cylinder at least during the period in which the engine cylinder is held under the compression stroke.

Fuel intake system for a supercharged engine

A two rotor type rotary piston engine includes an intake system comprised of individual intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and adapted to be cyclically closed by the rotors as the rotor rotate, an intake passage including a throttle valve and individual passages leading respectively to the intake ports and communicated with each other by communicating passages downstream of the throttle valve. The intake port includes a main port having an opening period of 230.degree. to 290.degree. in terms of angle of rotation of the eccentric shaft and an auxiliary port having an opening period of 270.degree. to 320.degree. in terms of the angle of rotation of the eccentric shaft. The auxiliary port is normally closed but opened in heavy load operation by a control valve and has a closing timing later than that of the main port. The communication passages and the individual passages leading to the respective rotor cavities have overall length between 0.57 and 1.37 m so that a compression wave produced in one individual passage in opening timing of one intake port is transmitted to the other intake port just before the other intake port is closed to obtain an additional charge under engine speed ranges of 3000 to 4500 rpm and 5000 to 7000 rpm.

Intake system for rotary piston engine

A two rotor type rotary piston engine includes an intake system comprised of individual light load intake ports and heavy load intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and adapted to be cyclically closed by the rotors as the rotor rotate, an intake passage including a throttle valve and individual light load and heavy load passages leading respectively to the light load and heavy load intake ports. The light load passages are communicated with each other by a communicating passage downstream of the throttle valve and the heavy load passages are also communicated each other by a further communication passage. The intake port timings and the passage lengths are so determined that pressure resonance effects can be obtained at both medium and high speed engine operations.

A two rotor type rotary piston engine includes an intake system including individual intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and adapted to be cyclically closed by the rotors as the rotors rotate, an intake passage including a throttle valve and individual passages leading respectively to the intake ports and communicated with each other by communicating passages downstream of the throttle valve. The intake port has an opening period of 270.degree. to 320.degree. in terms of the angle of rotation of the eccentric shaft, the communication passages and the individual passages leading to the respective rotor cavities having overall length between 0.57 and 1.37 m so that a compression wave produced in one individual passage in opening timing of one intake port is transmitted to the other intake port just before the other intake port is closed to obtain an additional charge under an engine speed range of 5000 to 7000 rpm.

A two rotor type rotary piston engine includes an intake system comprised of light load intake ports provided in the intermediate housing and heavy load intake ports provided in side housings to open to the respective rotor cavities and being cyclically closed by the rotors as the rotor rotates, an intake passage including a throttle valve and individual passages leading respectively to the intake ports. The passages leading to the light load ports are communicated with each other by a communicating passage downstream of the throttle valve. The heavy load intake port includes a main port and an auxiliary port. The auxiliary port is normally closed but opened in high speed, heavy load operation by a control valve and has a closing timing later than that of the main port. The communication passage and the individual passages leading to the light load intake ports have overall length in relation to the port timings so that a compression wave produced in one individual passage in opening timing of one light load intake port is transmitted to the other light load intake port just before the other light load intake port is closed to obtain an additional charge under an engine speed in which the control valve is moved from the closed position to the open position or vice versa.

A rotary piston engine including a casing comprised of a rotor housing and a pair of side housings attached to the opposite sides of the rotor housing to define a rotor cavity. A substantially triangular rotor is disposed in the rotor cavity. The intake system includes a light load intake port formed in one of the side housings so as to open to the rotor cavity, a medium load and heavy load intake ports formed in the other side housing. The light load and medium load intake ports are formed so that they are opened to a working chamber before the chamber is disconnected from the exhaust port. The heavy load intake port is associated with a control valve which is closed under light and medium load operations. The medium load intake port has an effective area smaller than that of the light load intake port and is closed earlier than the light load intake port.

Multiple port intake means for rotary piston engines

Intake system for a multiple cylinder internal combustion engine having primary and secondary passages leading to each cylinder and respectively provided with throttle valves. The primary passages for the respective cylinders are connected together through a first communicating passage of relatively large cross-sectional area and a second communicating passage of a relatively small cross-sectional area which is downstream of the first passage. One of the primary passages is provided with a shut-off valve which is located close to but downstream of the second communicating passage and adapted to be closed in idling operation or deceleration of the engine for directing the mixture totally toward the cylinder associated with the other primary passage. The primary and secondary passages leading to the same cylinder are connected together by a connecting passage downstream of the throttle valve. The connecting passage for the primary passage having the shut-off valve is located downstream of the shut-off valve so as not to weaken the function of the shut-off valve.

Growing community of inventors

Hiroshima, Japan

Tomoo Tadokoro