Nippondenso Co., Ltd.

Toshiaki Kikuchi

Masumi Kinugawa

Seiithirou Nishikawa

Masakazu Ninomiya

Kenichiro Kamai

Kazunori Kishita

Jun Ozeki

Shosuke Suzuki

Kenichirou Kamai

A throttle control system reliably determines failure of a throttle valve driving system. During engine idling, a throttle valve is opened and closed by an actuator. A central processing unit generates a pulse-like drive signal to the actuator through a back-up integrated circuit. When the frequency of the drive signal exceeds a predetermined value, the back-up integrated circuit determines that a failure in the central processing unit has occurred. Since this determination is based on the frequency of the drive signal, a driving system failure can be reliably detected even using pulse-like signals.

Throttle valve control apparatus of vehicle

An electronic control system for an internal combustion engine. The system detects a property of the gasoline such as a vaporization characteristic by using refractive indexes. The system then detects various operating conditions of the engine. The system also determines various control amounts of the engine in accordance with the detected gasoline property and the various engine operating conditions. The system may determine a rate of fuel injection into the engine in accordance with the detected gasoline property. The system also controls the engine in accordance with the various control amount. Finally, the system detects that the engine is in an improper controlled state and may suppress one or more of the controls.

Electronic control system for an internal combustion engine

A control apparatus for speedily warming up a catalyst disposed within an exhaust pipe connected to an internal combustion engine. The control apparatus calculates a demand fuel injection quantity into the engine on the basis of an operating state of said engine, and corrects the calculated demand fuel injection quantity on the basis of a warming-up state of a catalyst provided in an exhaust pipe of the engine so that an air fuel ratio in the engine is repeatedly controlled to a rich side and a lean side in a state that the warming-up of the catalyst is not completed. The control apparatus is equipped with an inhibiting function to inhibit the air fuel ratio from being controlled to the rich side and the lean side when the engine takes an operating state that the injection quantity is set to a rich side with respect to the theoretical air fuel ratio.

Control apparatus for speedily warming up catalyst in internal

A control apparatus for rapidly warming up a catalyst disposed within an exhaust pipe connected to an internal combustion engine. The control apparatus first determines a fuel injection amount and an ignition timing of the engine on the basis of an engine operating condition such as an intake air pressure of the engine and a rotational speed of the engine. The control apparatus is also responsive to temperature information of the catalyst for adjusting the fuel injection amount and the ignition timing in accordance with the catalyst temperature information. When the catalyst temperature does not reach the effective emission-purifying temperature, the control apparatus alternately adjusts the fuel injection amount to a rich amount and a lean amount and further intermittently retards the ignition timing. This injection and ignition control operation allows acceleration of the warming-up of the catalyst to suppress the deterioration of the emissions from the engine.

Control apparatus for rapidly warming up catalyst in internal combustion

An apparatus for controlling a quantity of fuel injected into an internal combustion engine comprises a sensor for detecting atomspheric pressure, a sensor for detecting a load condition of an internal combustion engine, and an electronic control device including a microprocessor. The CPU functions to perform the processing steps including: step of setting a reference fuel injection quantity in accordance with a load condition of the engine, step of detecting a transient condition of the engine, step of setting a transient correction value in accordance with the transient condition of the engine, step of correcting the transient correction value to be decreased as the atmospheric pressure decreases, and step of setting a quantity of injection fuel supplied to the engine in accordance with the set value of the reference fuel injection quantity and the corrected transient correction value, whereby a deviation of an air fuel ratio from an appropriate value can be prevented even under a transient condition where atmospheric pressure varies.

Fuel injection control apparatus having atmospheric pressure correction

An air-fuel ratio control system realized with a computer for an internal combustion engine is disclosed, wherein an idle discriminator unit discriminates whether the internal combustion engine is idle or not, and when it is idle, an idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount in accordance with an output of an air-fuel ratio detector. When the engine is not idle, on the other hand, a non-idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount. The idle air-fuel ratio compensation amount determining unit includes a rich-lean discriminator unit for discriminating whether the air-fuel ratio is on lean or rich side in accordance with the output of the idle discriminator unit, a skip unit for skipping the air-fuel ratio compensation amount to a greater degree than in non-idle state when the rich-lean discriminator unit decides that the air-fuel ratio has shifted from lean to rich side or the opposite way, a hold unit for holding the compensation amount after skip for a predetermined length of time, and an integrator for integrating the compensation amount upon the lapse of the predetermined length of time.

Air-Fuel ratio control system for internal combustion engine

An engine throttle valve position detector has a throttle switch formed by a rotary detector member rotatable with the engine throttle valve, a single stationary contact and a single movable contact movable by a guide groove in the rotary detector member into and out of electrical contact with the stationary contact. The stationary and movable contacts are contacted together when the throttle valve is in both fully-closed and fully-open positions, to thereby emit electric signals to an electric control unit in which the signals are processed on the basis of engine intake air flow and engine oil temperature to judge one of the throttle valve fully closed and fully-open positions.

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Okazaki, Japan

Toshiaki Kikuchi