Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Haruo Watanabe

Hiroshi Itoh

Mamoru Kobashi

Nobuyuki Kobayashi

Hidenori Tateno

Kunio Endo

Mitsuo Kawai

Akito Oonishi

Hiroshi Itou

Kazuo Nakano

Akito Ohnishi

An electronically controlled fuel injection apparatus for internal combustion engine which increases the rate of fuel injection when the engine speed drops by a rate more than a predetermined rate under a condition that the aperture of the throttle valve is minimum, that is, under an idling condition. In order to increase the rate of fuel injection, the width of the basic fuel injection pulse is enlarged which is given according to the engine speed and the intake air flow rate, or, in addition to the basic fuel injection pulse, a predetermined rate of fuel is injected asynchronously, i.e., independently from the crank angle of the engine.

Electronically controlled fuel injection apparatus for internal

An apparatus for controlling fuel injection in a multicylinder internal combustion engine, wherein fuel injectors for each cylinder are simultaneously operated synchronous with crank angles. The amount of injection is controlled by signals from an air flow meter. The apparatus includes a system operating, nonsynchronous with crank angles, the injectors when the engine is accelerated. The amount of nonsynchronous fuel injection is controlled in accordance with the position of the nonsynchronous injection (i.e., occurrence of acceleration) between adjacent synchronous injections.

Non-synchronous injection acceleration control for a multicylinder

An engine comprising a fuel injector, an oxygen concentration detector and an electronic control unit. In the electronic control unit, a basic fuel injection time period is calculated, and a correction valve of the basic fuel injection time period is calculated on the basis of the output signal of the oxygen concentration detector. The electronic control unit comprises a back-up RAM storing the mean value of the correction value therein, and an output outputting a voltage which corresponds to the correction value. A connector device is provided, which comprises a connector body and a cap removably fitted onto the connector body. The connector body comprises a output terminal connected to the output of the electronic control unit, a power input terminal connected to the back-up RAM, and a power supply terminal connected to a battery. The cap has a U-shaped connecting terminal which comes into contact with the power input terminal and the power supply terminal for applying an electric power to the back-up RAM when the cap is fitted onto the connector body.

Connector device for use in an internal combustion engine

An injector is driven in response to a basic injection pulse signal having a pulse width extracted from an engine rotational speed and an intake air flow rate. It is judged that an engine is in normal operation only after the engine has performed predetermined rotations from a moment at which a throttle valve begins to open. During normal operation of the engine, a time period for limiting a pulse width corresponding to an engine rotational speed is selected, and, after this time period has elapsed, a pulse cut signal is generated to interrupt fuel injection of the injector in spite of the presence of the basic injection pulse signal. The basic fuel injection pulse signal is not cut under a transitional condition of the engine.

Fuel injection control system

The present invention relates to a fuel cut system for an electronic control system of an engine. When the deceleration of engine rotation is large during fuel cut, the fuel cut is interrupted at the rotational speed higher than when the deceleration is small, and thereby the engine stop caused by the fuel cut during racing period or the like is prevented.

Fuel cut system for electronic control system

An idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to a surge tank which is arranged in the bypass passage located downstream of the throttle valve. A flow control valve is fixed onto the surge tank and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed.

Idling speed control device of an internal combustion engine

An idling speed control device of an internal combustion engine comprising a bypass passage which interconnects the intake passage located upstream of the throttle valve to the intake passage located downstream of the throttle valve. A flow control valve is arranged in the bypass passage and actuated by a step motor for controlling the amount of air flowing within the bypass passage to maintain the idling speed of an engine at a predetermined speed. A cooling water passage is formed in the valve housing of the flow control valve.

An idling rotational speed control device wherein, when an engine ignition switch is turned off, an air flow rate control device is driven to a fully closed position or a fully opened position, and the air flow rate control valve is controlled referenced from the fully closed position or the fully opened position as the new reference position. During idling, the flow rate of air taken into an intake manifold is controlled by the intentional opening degree from the reference position of the air flow rate control valve so as to correctly perform control.

Rotational speed control device during idling of engine

An apparatus for diagnosing a malfunction of an electronic control system including sensors for electrically sensing conditions of sensing points of a vehicle and an electronic calculation unit for determining an energizing condition of an actuator for controlling a vehicle operation in accordance with output signals from the sensors is disclosed. The malfunction diagnosing apparatus is inserted intermediate of wires which connect the sensors or the actuator and the electronic control system, and when a voltage or current level on any wire assumes a non-steady state, the malfunction diagnosing apparatus determines that a malfunction has occurred at a portion associated with that wire and memorizes and holds the occurrence of the malfunction.

Malfunction diagnosing apparatus for electronic control system for

Disclosed is an air-fuel ratio feedback control apparatus for an internal combustion engine. The engine adopts a fuel injection system and the air-fuel ratio control apparatus comprises a specific air flow meter whose output signal indicates a different amount from the actual amount of air flow sucked into the engine, and a feedback control stopping circuit. When the feedback control is stopped, the desirable air-fuel ratio is obtained.

Growing community of inventors

Okazaki, Japan

Haruo Watanabe