Honda Motor Co., Ltd.

Kazunori Kawamura

Futoshi Nishioka

Osamu Kitamura

Kazuhiro Kobayashi

Seiji Watanabe

Takeshi Aoki

Michinori Tani

Atsuhiro Miyauchi

Tooru Sekiguchi

Akira Kobayashi

Shoji Sasaki

In the communication interruption state in which the transmission of a drive control command value DUTY from an engine control unit (ECU)to a fuel pump driver (FPD)is disabled, the FPDis configured so as to drive a fuel pumpby using the maximum command value DTYMAX (100%) as a drive control command value DUTY. A stop state of the fuel pumpis maintained even if the drive control command value DUTY is the maximum command value DTYMAX when an ignition switchis in the OFF State so as to have stopped the fuel pump, while the fuel pumpis driven when the ignition switchis in the ON state and the drive control command value DUTY is the maximum command value DTYMAX.

Control device of fuel pump

An air-fuel ratio control apparatus for an internal combustion engine includes an air-fuel ratio detector, a fuel amount controller, an operational state parameter acquiring device, an extractor, a failure determination device, a variation state parameter calculator, and a determination stopping device. The operational state parameter acquiring device is configured to acquire at least one operational state parameter. The failure determination device is configured to execute failure determination of determining a failure in an air-fuel ratio control system of the internal combustion engine based on a specific frequency component extracted by the extractor. The variation state parameter calculator is configured to calculate a variation state parameter. The determination stopping device is configured to stop the failure determination if the variation state parameter calculated by the variation state parameter calculator is equal to or larger than a predetermined threshold value.

Air-fuel ratio control apparatus for internal combustion engine

A control system for an internal combustion engine in which fuel containing alcohol is used. In the control system, a maximum opening of a throttle valve of the engine is set, and a target opening of the throttle valve is set to a value which is equal to or less than the maximum opening. An opening of the throttle valve is controlled so as to coincide with the target opening. The maximum opening is according to a concentration parameter indicative of a concentration of alcohol in the fuel, a temperature parameter indicative of a temperature of the engine, and a number of ignitions performed after start of the engine.

Control system for internal combustion engine

A throttle valve control system for an internal combustion engine which controls an opening of a throttle valve of the engine so that the opening coincides with a target opening. A regulation value of a change amount of the throttle valve opening is set according to at least a temperature parameter indicative of a temperature of the engine. The target opening is set within a range defined by the regulation value. An upper limit value and a lower limit value of the regulation value is set according to the temperature parameter, and a transition control is performed wherein the regulation value is set according to an elapsed time period after start of the engine so as to change from the lower limit value to the upper limit value.

Throttle valve control system for internal combustion engine

Growing community of inventors

Wako, Japan

Kazunori Kawamura