Mazda Motor Corporation

Toyo Kogyo Co., Ltd.

Madza Motor Corporation

Ikuo Matsuda

Haruo Okimoto

Tomoo Tadokoro

Seiji Tashima

Masami Nakao

Toshimichi Akagi

Einosuke Suekuni

Ikuo Onimura

Nobuhiro Hayama

Masasige Kinjyo

Tomoo Todokoro

Akihiro Nakamoto

An engine is provided with primary and secondary turbochargers. In a small intake air mass range, only the primary turbocharger is caused to operate, and in a large intake air mass range, both the primary and secondary turbochargers are caused to operate. A waste gate valve and an exhaust bypass valve are controlled so that the supercharging pressure approximates to a target supercharging pressure. The target supercharging pressure in the large intake air mass range is set lower than that in the small intake air mass range.

Supercharging pressure control system for engine with turbochargers

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

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 turbo-supercharger for an engine includes a turbine casing having a turbine scroll divided into a first and second inlet passages. The inlet passages are opened to the engine exhaust passage through first and second inlet ports formed in a mating surface where the turbine casing is attached to the exhaust passage. A shut-off valve is provided in the exhaust passage and has a valve member which is adapted to be seated on the mating surface to close the second inlet port to thereby allow the exhaust gas to flow only through the first inlet passage. The shut-off valve is opened under high speed, heavy load operation so that the exhaust gas is passed through both the first and second inlet passages. A bypass passage is provided in the turbine casing to open at one end to the first inlet passage. A waste gate valve is provided to open the bypass passage when the supercharging pressure exceeds a predetermined value.

Plural turbine inlet passage turbo-supercharger with inlet passage

A multiple rotor type rotary piston engine includes an intake system of individual intake ports provided in at least one of the intermediate and side housings to open to the respective rotor cavities and being cyclically closed by the rotors as the rotor rotate, an intake passage including a common passage and individual passages divided from the common passage and leading respectively to the intake ports, the individual passages being communicated with each other by communicating passages. The intake passage is provided with a turbo-supercharger having a waste gate valve for limiting the intake pressure below a predetermined value so that there is produced an engine operating zone wherein the intake pressure is lower than the exhaust gas pressure. The communication passages and the individual passages leading to the respective rotor cavities have such an overall length 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 in the aforementioned engine operating zone.

Intake system for rotary piston engine

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 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.

An engine intake system including a main intake passage leading to a combustion chamber through a main intake valve, a supercharging passage leading to the combustion chamber, and a supercharging pump provided in the supercharging passage. A rotary type timing valve is located in the supercharging passage and includes a rotor having inlet ports communicating with the supercharging passage at an upstream portion of the supercharging passage and an outlet port connected with the inlet port through a valve passage formed in the rotor. The rotor is driven in synchronism with engine rotation, the outlet port being arranged so that it is cyclically communicated with the supercharging passage at a downstream portion of the supercharging passage as the rotor rotates. There is provided a passage port provided in the downstream portion of the supercharging passage for cooperation with the outlet port in the rotor, the passage port including at least two port segments which are arranged so that one of the port segments is communicated with the outlet port in the rotor earlier than the other port segment. A shut-off valve is provided in the one port segment and movable between a closed position and an open position, a valve actuator for actuating the shut-off valve for changing opening period of the timing valve in accordance with the engine speed.

Engine intake system

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

An internal combustion engine including a combustion chamber, an intake system having an intake valve and an intake passage leading through the intake valve to the combustion chamber for providing a supply of intake gas to the combustion chamber. A valve timing control device is provided for governing opening and closing timings of the intake valve so that the intake valve is closed at a controlled timing in the compression stroke, whereby a controlled amount of the intake gas is returned from the combustion chamber to the intake passage in the compression stroke to thereby control the effective charge to the combustion chamber. A detecting device is provided for detecting at least one factor which is related to engine speed and producing an engine speed signal, and a manually operated reference setting device for determining a reference value together with, an engine overrun preventing device for comparing the engine speed signal with the reference value and retarding the closing timing of the intake valve to thereby decrease the effective charge when the engine speed signal is greater than the reference value.

Intake system for an internal combustion engine

An internal combustion engine including a combustion chamber of which volume is cyclically changed in response to a rotation of the engine to effect a plurality of operating strokes including an intake stroke, an intake system including a main intake passage and an auxiliary intake passage both leading to the combustion chamber, a supercharger for providing a supply of supercharging gas to the auxiliary intake passage, a timing valve provided in the auxiliary intake passage between the combustion chamber and the supercharger, means for the timing valve being driven by the engine crankshaft for cyclically opening the auxiliary intake passage in synchronim with the rotation of the engine to allow the supercharging gas to pass to the combustion chamber, an electrically operated timing adjusting member for adjusting the opening timing of the valve, a timing control electrical circuit for controlling the adjusting member to determining the opening timing of the timing valve in accordance with a plurality of engine operating parameters.

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Hiroshima, Japan

Ikuo Matsuda