Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Hidemi Ohnaka

Toshio Tanahashi

Michio Furuhashi

Yasuhiro Ooi

Koichi Satoya

Mamoru Yoshioka

Takaaki Itou

Hiroshi Tanaka

Keiso Takeda

Masaaki Tanaka

Yukihide Niimi

Yuuichi Kato

Kazuhisa Kunitake

Norihiko Nakamura

Akihiro Katayama

Takashi Kato

Kenichi Harada

Norio Shibata

Satoru Watanabe

Hideaki Mizuno

Kazuhiko Norota

Kouichi Hoshi

Masahiro Urushidani

Norikatsu Ishikawa

Yoshiaki Shibata

Nobuki Uchitani

Akira Hashizume

Seietsu Yoshida

Kenzi Kinoshita

Tatsuyoshi Kamohara

Ritsuo Masaki

Masaru Goudo

Kouichi Satoya

Mitsuhiro Suzuki

Yasuo Ohmori

Masanobu Kanamura

A control apparatus for an internal combustion engine is provided which performs intake air flow control for controlling an engine speed to a target engine speed during starting of the engine, by adjusting a throttle opening depending upon the engine speed. The control apparatus judges a degree of deterioration of a combustion state in the engine, based on a difference between a predetermined reference peak engine speed and an actual peak engine speed, and switches from the intake air flow control to ignition timing control for controlling the engine speed when the engine operates in a poor combustion state, at a point of time that is determined based on the degree of deterioration of the combustion state.

Control apparatus for internal combustion engine and method of controlling internal combustion engine

An exhaust gas purification device comprising a three way catalyst, an oxidizing catalyst and a NOx absorbent which are arranged in this order in the exhaust passage. A rich air-fuel mixture is burned in the combustion chamber, and secondary air is supplied upstream of the three way catalyst so as to make the air-fuel ratio of the exhaust gas flowing into the three way catalyst a rich air-fuel ratio greater than the air-fuel ratio of the air-fuel mixture burned in the combustion chamber. Further, secondary air is supplied upstream of the oxidizing catalyst to make the air-fuel ratio of the exhaust gas flowing into the oxidizing catalyst and the NOx absorbent slightly leaner than the stoichiometric air-fuel ratio.

Engine exhaust gas purification device

An exhaust gas purification device comprising a three way catalyst, an oxidizing catalyst and a NOx absorbent which are arranged in this order in the exhaust passage. A rich air-fuel mixture is burned in the combustion chamber, and the exhaust gas discharged from the engine is initially introduced into the three way catalyst. Secondary air is fed into the exhaust passage between the three way catalyst and the oxidizing catalyst so that the air-fuel ratio of the exhaust gas flowing into the oxidizing catalyst and the NOx absorbent becomes lean.

A boost pressure control system for a vehicle engine equipped with a supercharger and a torque converter having a lock-up clutch, in which the boost pressure is controlled by adjusting the degree of the opening of an air bypass valve and the ON/OFF position of the supercharger in such manner that the different control characteristics of the boost pressure are selected in accordance with whether the lock-up clutch of the torque converter is turned ON or OFF, i.e., when the lock-up clutch is turned ON, the supercharger is started at a lower engine load, and the degree of the opening of the air bypass valve is set smaller, thereby enabling the lock-up operation of the torque converter under running conditions in which a higher driving torque is required and, thereby widening the operating range of the lock-up operation of the torque converter and improving the fuel economy of the vehicle.

Boost pressure control system for an engine

A boost pressure control system for an engine, by which a boost pressure of the engine is controlled in accordance with a load of the engine. The system controls the boost pressure in two different control modes, i.e., an acceleration mode and a normal mode, and when a degree of acceleration required becomes larger than a predetermined value, the acceleration mode is selected in which the boost pressure is made higher than in the normal mode. To avoid a sudden drop of the boost pressure, the system maintains the acceleration mode even after the completion of the acceleration, until the engine load becomes low enough that the boost pressure drops to the level at which the switching to the normal mode does not cause a sudden pressure drop.

Boost pressure control system for a supercharged engine

A boost pressure control system for an engine, by which the degree of opening of the air bypass valve is adjusted and on/off of a mechanical supercharger operation is controlled to obtain an appropriate boost pressure. In the system, the degree of opening of the air bypass valve is adjusted in accordance with the load of the engine, based on different characteristics selected in accordance with whether the operation of the supercharger is started or stopped. If the engine is operated in a non-boost region, when the supercharger is operating the degree of opening of the air bypass valve is made larger to reduce the compression work of the supercharger, and when the operation of the supercharger is stopped, the degree of opening of the air bypass valve is made smaller to ensure that the air flow through the supercharger maintains the rotation of the rotors of the supercharger.

For controlling supply of electric power to a heater for an oxygen sensor for detecting oxygen in an exhaust system of an internal combustion engine so as to maintain the electric resistance of the heater to a target value therefor, the target value is corrected based upon detection of the amount of electric power supplied to the heater so that difference between the detected amount of electric power supplied to the heater and a standard value therefor is cancelled.

Control device for heater for oxygen sensor operative to correct target

A diagnosis device for an exhaust gas recycling device diagnoses whether or not an exhaust gas recycling device is operating normally; the temperature of an exhaust gas recycling passage is detected by a temperature detection means, a decision is made by an exhaust gas recycling operating region detection means whether or not the operating region is such as to carry out exhaust gas recycling, when a decision is made that the operating region is such as to carry out exhaust gas recycling a counter is incremented and when otherwise is decremented, and a decision that the exhaust gas recycling is not being carried out normally, that is that the exhaust gas recycling device has failed, is made when the count value of this counter is at least a certain value and the temperature of the exhaust gas recycling passage is not more than a certain value.

Diagnosis device for exhaust gas recycling device of internal combustion

A diagnosis device of an exhaust gas recycling device of an internal combustion engine checks operating conditions of the engine and determines whether the engine is operating with performance of exhaust gas recycling based upon the checked conditions by modifying them according to atmospheric pressure.

Diagnosis device for an internal combustion engine exhaust gas recycling

A deceleration control device of an engine comprising an intake passage which has a throttle valve therein. A bypass passage is branched from intake passage upstream of the throttle valve and is connected to the intake passage downstream of the throttle valve. A flow control valve is arranged in the bypass passage. At the time of deceleration, when the supply of fuel is cut, the flow control valve opens to increase the flow area of the bypass passage by a predetermined flow area.

Deceleration control device of an internal combustion engine

A supercharger of an internal combustion engine having a Roots-type pump comprising; a pair of rotors rotatably mounted in a pump housing so as to rotate synchronously in opposite directions to suck air from an air inlet and discharge it through an air outlet. The pump housing defines annular spaces around the rotor shafts and between the axial end faces of the rotors and bearings rotatably supporting the rotor shafts. The annular spaces are connected to the atmosphere via a control valve, so that the atmospheric air is introduced into the annular spaces during certain engine driving conditions to reduce the pressure difference existing around the bearings.

Supercharger of an internal combustion engine having Roots pump

In an air-fuel ratio control apparatus for detecting the air-fuel ratio from the oxygen content of the exhaust gas from an engine and feedback controlling the air-fuel ratio at the desired ratio through an integrating circuit, the circuit constant of the integrating circuit is increased with increase in the altitude to improve the control response characteristic.

Air-fuel ratio control apparatus

An air-fuel ratio control system for engines comprises a control unit by which the air-fuel ratio is maintained constant to enrich the mixture gas for a first predetermined time length after the detection of an engine heavy load condition, the air-fuel ratio is controlled as predetermined on the basis of an oxygen detection signal for a second predetermined time length after the lapse of the first predetermined time length, and the air-fuel ratio is restored to the constant value thereby to enrich the mixture gas after the lapse of the second predetermined time length.

Air-fuel ratio control system for internal combustion engines

An engine includes a double barreled carburetor. A sensor mounted to the exhaust system detects the concentration of a component in the exhaust. A control unit, based on a signal from the sensor, dispatches a control signal to an air bleed control valve to vary its resistance. Primary and secondary path systems lead from the outlet of the air bleed control valve and respectively supply primary bleed air into the fuel which is being supplied into the primary barrel of the carburetor and secondary bleed air into the fuel which is being supplied into the secondary barrel of the carburetor. A one way valve is fitted in the secondary path system so as to allow air flow only towards the secondary barrel, and not away therefrom. Thus, when both barrels are opened, bleed air is sucked in to the primary barrel through the primary path system, and also bleed air is sucked in to the secondary barrel through the secondary path system past the one way valve; but, when only the primary barrel is opened, bleed air is sucked in to the primary barrel through the primary path system, but no bleed air is sucked in to the secondary barrel through the secondary path system, and the one way valve prevents reverse flow of air from the secondary barrel through the secondary path system and thencefrom into the primary path system towards the primary barrel.

Engine air/fuel ratio control system injecting bleed air into both fuel

A throttle valve opening controller for applying varying retarding forces against the closing force of the throttle valve at the time of quick closing thereof depending on the operating condition of the engine, comprising:

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Susono, Japan

Hidemi Ohnaka