Honda Giken Kogyo Kabushiki Kaisha

Kenichiro Ishii

Kazutomo Sawamura

Yoshiharu Saito

Shigetaka Kuroda

Akira Kato

Toru Kitamura

Hisashi Igarashi

Akira Katoh

Tetsuya Ono

Yusuke Hasegawa

Yoichi Nishimura

Jun Takahashi

Katsuhiro Kumagai

Hiroshi Ohno

A control system for an internal combustion engine with an automatic transmission having a torque converter, and a lock-up device. When gear shifting of the automatic transmission is carried out, the output torque of the engine is increased so as to reduce a shock caused by the gear shifting. The engaging force of the lock-up device is changed in response to the increase of the output torque.

Control system for internal combustion engines

A control system for an internal combustion engine for an automotive vehicle increases the output torque of the engine during an upshift of the automatic transmission so as to reduce a shock generated during the upshift. Time periods are measured over which respective speed clutches of the automatic transmission have been disengaged. The timing of increasing the output torque of the engine during the upshift of the automatic transmission is changed, based on one of the time periods measured over which one of the speed clutches of the automatic transmission to be selected for the upshift has been disengaged.

Control system for changing the time period at which torque is increased

A control system for an internal combustion engine for a vehicle has an automatic transmission. The control system is operable during gear shifting of the automatic transmission, for changing output torque of the engine to reduce a shock generated during the gear shifting. During gear shifting in which a change gear ratio of the automatic transmission is to be increased, upon stepping-on of the accelerator pedal of the vehicle, the output torque of the engine is increased by a first predetermined amount based on an operating condition of the vehicle when an increase occurs in the rotational speed of the engine due to the gear shifting. After the output torque of the engine is increased by the first predetermined amount, the output torque of the engine is decreased by a second predetermined amount based on the operating condition of the vehicle. After the output torque of the engine is decreased by the second predetermined amount, the output torque of the engine is progressively recovered to a value assumed upon completion of the gear shifting.

Control system for internal combustion engines for vehicles

A cylinder-by-cylinder air-fuel ratio-estimating system for an internal combustion engine includes an air-fuel ratio sensor arranged in the exhaust system of the engine, at a confluent portion of the exhaust system. The air-fuel ratio of a mixture supplied to each of the cylinders is estimated based the output from the air-fuel ratio sensor, by using an observer for observing the internal operative state of the exhaust system based on a model representative of the behavior of the exhaust system. The air-fuel ratio at the confluent portion is estimated by using a delay parameter representative of the response delay of the air-fuel ratio sensor, and the air-fuel ratio of the mixture supplied to each of the cylinders is estimated by using the estimated air-fuel ratio at the confluent portion. The estimated air-fuel ratio of the mixture supplied to each of the cylinders is subsequently used for estimating a value of the air-fuel ratio at the confluent portion of the exhaust system.

Cylinder-by-cylinder air-fuel ratio-estimating system for internal

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.

Growing community of inventors

Wako, Japan

Kenichiro Ishii