Toyota Jidosha Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Aisin Seiki Kabushiki Kaisha

Nippondenso Co., Ltd.

Nippon Soken, Inc.

Yukio Suzuki

Kunihiko Sato

Motoyasu Muramatsu

Hiroshi Takahashi

Takao Nonoyama

Susumu Nogami

Tokio Kohama

Tsuneyuki Egami

Masami Inada

Kimitaka Saito

Kenji Hashimoto

Hironobu Ono

Motoharu Sueishi

Tsutomu Saito

Masashi Matsuo

Yoshihiko Matsuda

Toshiro Harada

Kazuo Ueda

Shuzo Yoshida

Kan Otsuka

Tutomu Tomita

Noboru Matumoto

Closed-loop air-fuel ratio control performed by detecting the concentration of a predetermined component in the exhaust gas, by calculating an air-fuel ratio correction factor depending upon the detected concentration, and by correcting the fuel amount in accordance with the air-fuel ratio correction factor even when the engine is warming up. This closed-loop air-fuel ratio control operation is stopped by fixing the air-fuel ratio correction factor to a predetermined value when the engine is under acceleration during warm-up.

Air-fuel ratio control method and apparatus for an internal combustion

A method for controlling the fuel injection in an internal combustion engine using an upper limit of the pulse width of the fuel injection signal established on the basis of the limit intake air amount and the limit intake air amount per rotation multiplied by a predetermined constant. The fuel injection is carried out by the signal having the pulse width within the upper limit so that an over-rich air-fuel mixture is prevented.

Fuel injection control in internal combustion engine

In a method and apparatus for controlling fuel injection in an internal-combustion engine, crankshaft angle signals and cylinder discrimination signals are produced by a crankshaft angle sensor, and the signal for execution of the first injection of fuel is calculated in a control circuit on the basis of the crankshaft angle signals and the cylinder discrimination signals so that the first explosion of the air-fuel mixture takes place within one rotation of the crankshaft of the engine.

Fuel-injection control in an internal-combustion engine

A system for controlling the air-fuel ratio of an internal combustion engine includes a transient fuel amount increasing device for regulating the supply fuel amount in the transient state of the engine on the basis of the detection of the transient state of the engine, an air-fuel ratio deviation detecting device for detecting the air-fuel ratio deviation from the optimum air-fuel ratio, and a transient fuel increase amount correcting device for correcting the fuel increase amount in the transient state of the engine in accordance with the air-fuel ratio deviation detected by the air-fuel ratio deviation detecting device. The air-fuel deviation from the optimum air-fuel ratio of the air-fuel mixture upon deposition of a deposit on the back surface of the intake valve is prevented, and the drivability of an automobile is improved.

System for controlling air-fuel ratio in internal combustion engine

In an internal-combustion engine disposed in a vehicle, when the engine is in an idle state and the vehicle speed is not equal to zero and is less than a predetermined value, the air-fuel ratio of the engine is controlled so that the air-fuel mixture is on the lean side of the stoichiometric air-fuel ratio. In addition, even after the vehicle speed becomes zero, the air-fuel ratio is controlled so that the air-fuel mixture is on the lean side for a predetermined time period.

Method and apparatus for controlling the air-fuel ratio in an

During starting of an engine, enrichment correction according to engine starting enrichment is executed. After starting of the engine, enrichment correction is transferred gradually with the lapse of time from starting enrichment to normal warm-up enrichment. The transfer speed from starting enrichment to normal warm-up enrichment is changed depending upon whether a throttle valve is in an idle position or not.

Method and apparatus for controlling the fuel feeding rate of an

In the control of fuel injection in an internal-combustion engine, whether or not the rate of change of the engine rotational speed exceeds the selected limit of the rate of change of the engine rotational speed, determined by the ratio of the engine rotational speed to the automobile speed and the ratio of the intake air amount to the engine rotational speed, is checked. The value of the engine rotational speed used in the control of the fuel injection pulse width and the ignition timing is restricted to within the selected limit of the rate of change of the engine rotational speed.

Fuel injection control in an internal-combustion engine

Disclosed herein is a system for controlling an ignition timing of an internal combustion engine in its idle condition. A control chamber of a vacuum advancer for operating a distributor of the engine is connected, via a vacuum modulator valve formed as a double diaphragm mechanism, to a vacuum signal port formed in an intake passageway of the engine at a position downstream of a throttle valve in its idle position. The vacuum modulator is adapted to control the vacuum level at the control chamber of the advancer to be reversely proportional to the vacuum level at the vacuum signal port. Accordingly, a stable idle operation of the engine can be obtained.

Ignition timing control system for an internal combustion engine

A pressure control valve assembly comprising a rubber diaphragm to which is applied the negative pressure of the engine intake manifold and the exhaust gas pressure of the engine exhaust manifold. The diaphragm of the present invention is formed with a gradual descent sloping down from a valve-actuating central portion to an outer periphery. Adjacent to one portion of the outer periphery of the diaphragm a port opening to the outside of the valve assembly is provided. Thus, any gas ingredients such as condensed water can be expelled along the descent of the diaphragm via the port without gathering on the diaphragm surface which will therefore be free from objectionable oxidation or corrosion.

Diaphragm-operated pressure control valve assembly

An apparatus is provided for introducing secondary air for into an internal combustion engine. The apparatus has an air pump coupled to an air injection pipe system, the latter having an end terminating upstream of the catalytic converter, for introducing an amount of secondary air into the exhaust system of the engine. The apparatus further includes a valve device for maintaining the secondary air directed to the exhaust system from the air pump at determined constant pressure; thus, the amount of secondary air introduced into the exhaust system is effectively decreased during high rotational speed engine operation in order to prevent the catalytic converter from being overheated.

Apparatus for introducing secondary air into an internal combustion

This application discloses an EGR system in which the vacuum control valve is improved to comprise:

Exhaust gas recirculation system

An exhaust gas purifying system for use in an internal combustion engine for controlling the air injection into an exhaust manifold and the circulation of exhaust gases from the exhaust manifold to a suction pipe, due to a negative pressure prevailing in the suction pipe, in which the negative pressure varies depending on the running conditions of the engine.

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Toyota, Japan

Yukio Suzuki