Honda Giken Kogyo Kabushiki Kaisha

Akira Katoh

Hiroshi Kitagawa

Shigetaka Kuroda

Sachito Fujimoto

Toru Kitamura

Jun Takahashi

Kazutomo Sawamura

Toshiaki Hirota

Katsuhiro Kumagai

Shunichi Tsuzuki

Kenichiro Ishii

Yutaka Otobe

Yoichi Nishimura

Masaki Kanehiro

Shigeru Maruyama

Takuji Ishioka

Yoichi Iwata

Toshikazu Oketani

Hisashi Igarashi

Yoshihisa Hara

Tetsu Teshirogi

Yuuichi Shimasaki

Tetsuya Ono

Naoki Iida

Masami Watanabe

Kentaro Yokoo

Sakae Suzuki

A control system for an internal combustion engine has a catalyst arranged in the exhaust system, for purifying exhaust gases emitted from the engine. An ECU controls operation of the engine, based on at least one predetermined control parameter, and detects a temperature state of the catalyst at the start of the engine. The at least one predetermined control parameter is changed, based on the detected temperature state of the catalyst, after the start of the engine.

Control system for internal combustion engines and control system for

An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, has an upstream oxygen sensor and a downstream oxygen sensor arranged in the exhaust system at locations upstream and downstream of the catalytic converter, respectively. An ECU determines a feedback control constant, based on an output from the downstream oxygen sensor, and determines an air-fuel ratio control amount, based on the determined feedback control constant and an output from the upstream oxygen sensor. The ECU carries out feedback-control of the air-fuel ratio of a mixture supplied to the engine by means of the determined air-fuel ratio control amount. The updating rate of the feedback control constant is set based on the temperature of the catalyst of the catalytic converter.

Air-fuel ratio control system for internal combustion engines

A control system for an internal combustion engine for use in a vehicle. An ECU determines whether the catalytic converter is in a predetermined high temperature condition, and also determines whether the engine has continuously been in an operating condition in which the rotational speed of the engine exceeds a predetermined value and load on the engine exceeds a predetermined value, over a predetermined time period. When the catalytic converter is in the predetermined high temperature or when the engine has continuously been in the above high speed and high load condition over the predetermined period, the ECU controls the throttle valve in a manner such that the opening of the throttle valve is decreased.

Control system with function of protecting catalytic converter for

A control system for an internal combustion engine for an automotive vehicle determines whether a catalytic converter arranged in the exhaust system of the engine is in a predetermined high temperature condition. When it is determined that the catalytic converter is in the predetermined high temperature condition, priority is given either to a decrease in the amount of intake air supplied to the engine or to an increase in the amount of fuel to be supplied to the engine, depending on operating conditions of the engine.

A driving force-calculating system calculates a desired driving force required by an automotive vehicle depending on operating conditions of the vehicle. A kinetic energy parameter representative of kinetic energy of the vehicle is calculated from an amount of change in speed of the vehicle assumed during acceleration of the vehicle. A correction coefficient is calculated based on an average value of a maximal value of the kinetic energy parameter assumed within a predetermined time period. The desired driving force required by the vehicle is calculated by the use of the correction coefficient. A control system for automotive vehicles which incorporates the driving force-calculating system is also provided.

Driving force-calculating system and control system incorporating same

A throttle valve control system for an internal combustion engine installed in a vehicle. A throttle valve opening sensor detects an actual opening of a throttle valve, and an ECU calculates a desired opening of the throttle valve according to the rotational speed of the engine and the required torque of the engine, which is calculated according to operating conditions of the engine and operating conditions of the vehicle, and electrically controls the throttle valve such that the detected actual opening of the throttle valve becomes equal to the desired opening of the throttle valve. An intake pressure sensor detects actual intake pressure within the intake passage, and desired intake pressure within the intake passage is calculated according to the rotational speed of the engine and the required torque of the engine. The desired intake pressure is compared with the detected actual intake pressure, and the desired opening of the throttle valve is corrected based on results of the comparison.

Throttle valve control system for internal combustion engines

A fuel supply control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, includes an ECU which estimates a storage amount of oxygen stored in the catalytic converter, calculates a physical amount having correlation with a purification rate of the catalytic converter, based on the estimated storage amount of oxygen, and controls the air-fuel ratio of an air-fuel mixture to be supplied to the engine, based on the calculated physical amount.

Fuel supply control system for internal combustion engines

A fuel injection mount control system for an internal combustion engine includes an ECU which calculates a first amount of fuel directly drawn into each combustion chamber out of an amount of fuel injected into the intake passage via a corresponding fuel injection valve, a second amount of fuel carried off fuel adhering to the wall surface of the intake passage into the combustion chamber, and an amount of fuel to be injected into the intake passage, based on the first fuel amount and the second fuel amount, calculates an air-fuel ratio correction amount, based on an output form an air-fuel ratio sensor arranged in the exhaust system, and corrects the amount of fuel to be injected into the intake passage by the air-fuel ratio correction amount. Further, the ECU corrects the second fuel amount, based on the air-fuel ratio correction amount.

Fuel injection amount control system for internal combustion engines and

A fuel injection amount control system for an internal combustion engine includes an ECU which calculates a desired amount of fuel to be supplied to each combustion chamber in response to operating conditions of the engine, and calculates values of parameters indicative of fuel adherence characteristics of the interior of the intake passage in response to operating conditions of the engine. The ECU further calculates a first fuel amount which is directly drawn into the combustion chamber from a fuel amount injected by the fuel injection valve, and a second amount of fuel which is carried off the wall surface of the intake passage due to evaporation and drawn into the combustion chamber, based upon the values of the parameters. The ECU calculates an injection amount of fuel to be injected, by correcting the desired fuel amount, based upon the first and second fuel amounts. When the engine is in a predetermined operating condition in which convergence of the fuel injection amount calculated by the ECU to the desired fuel amount can be unstable, the value of at least one of the parameters such that the fuel injection amount stably converges to the desired fuel amount.

Fuel injection amount control system for internal combustion engines

A misfire-detecting system for an internal combustion engine having a plurality of cylinders. A rotational speed of the engine is detected and a rotational speed signal indicative of the detected rotational speed of the engine is output. The rotational speed signal is filtered. Occurrence of a misfire in the engine is determined based on the filtered rotational speed signal.

Misfire-detecting system for internal combustion engines

Described herein is a method for controlling the bypass air flow of internal combustion engine, which prevents the air-fuel ratio from becoming over rich temporarily in the initial stage of deceleration of the engine by driving a control valve to open a throttle by-pass passage on deceleration of the engine to supply auxiliary air thereto and which includes: detecting the open angle of the throttle valve; setting a valve opening rate according to the throttle open angle; setting an upper limit on the valve opening rate when it is greater than an upper limit value determined in relation with the engine speed; driving the control valve according to the valve opening rate; and on deceleration of the engine, gradually reducing a valve opening rate set in an operation prior to the deceleration.

Growing community of inventors

Wako, Japan

Akira Katoh