Honda Giken Kogyo Kabushiki Kaisha

Eiji Kitsutaka

Takashi Aoki

Yutaka Tamagawa

Toru Yano

Tsunefumi Niiyama

Masaaki Yamaguchi

Satoshi Terayama

Shigeru Ibaraki

Shigeru Aoki

Daihei Teshima

Hirotoshi Inoue

Shigeo Ozawa

A control system for a hybrid vehicle prevents a voltage across an electric energy storage device from dropping excessively when the electric energy storage device is discharged with a generator/motor operating as an electric motor, for thereby effectively utilizing electric energy stored in the electric energy storage device as much as possible to operate the generator/motor as the electric motor. The control system also prevents the voltage across the electric energy storage device from rising excessively when the electric energy storage device is charged with the generator/motor operating as an electric generator, for thereby charging the electric energy storage device with electric energy generated by the generator/motor as much as possible while protecting the electric energy storage device. The control system controls operation of the generator/motor to keep a charging and discharging current of the electric energy storage device at a level equal to or smaller than a limiting value determined depending on the amount of electric energy stored in electric energy storage device and the temperature thereof when the generator/motor operates as the electric generator or motor.

Control system for hybrid vehicle

In a continuously variable transmission, a speed change control device includes a vehicle speed sensor, a brake sensor, a release vehicle speed memory which, when the brake is operated, renews and stores the brake release vehicle speed, and a gradient sensor for detecting a running road gradient. When, in an engine brake running state, the present vehicle speed is higher than the brake release vehicle speed stored in the release vehicle speed memory, a speed change target value is obtained according to the difference between the present vehicle speed and the brake release vehicle speed and to the road gradient. And, when, in the same state, the present vehicle speed is lower than the brake release vehicle speed, the speed change target value is obtained according to the road gradient. The speed change control is carried out so as to obtain the speed change target value.

Speed change control device for vehicular continuously variable

A hydraulic oil pressure changeover mechanism for switching an input pressure to a solenoid valve between a high pressure and a low pressure. The changeover mechanism is made up of: a pressure reduction valve to be switched between an operating condition for outputting a low hydraulic oil pressure and a non-operating condition for outputting a high hydraulic oil pressure; a changeover valve to be switched between a low-pressure position for inputting an output pressure from the pressure reduction valve to the solenoid valve and a high-pressure position for inputting a hydraulic oil pressure to be supplied without passing through the pressure reduction valve to the solenoid valve; and a control valve to be switched between a first position for outputting a first signal pressure to switch the pressure reduction valve to the non-operating condition and a second position for outputting a second signal pressure which operates in a direction to switch the changeover valve to the low-pressure position. The changeover valve can be switched to the low-pressure position when the second signal pressure and a third signal pressure are operated on the changeover valve.

Hydraulic control apparatus for hydraulically operated vehicular

An automatic transmission shift controlling method for preventing both excessive delays in speed ratio shifts and multiple shifts in close succession in response to two different shift commands in a short time period. When a first shift command is issued, the input and output rotational speed ratio of a shift device associated with a first target speed range for selecting a power transmission path associated with the first target speed range and determined by the first shift command is detected, and the start of operation of the shift device associated with the first target speed range is detected by checking whether the input and output rotational speed ratio has started to vary or not. When a second gear-shift command is issued after the first shift command has been issued but before the start of operation of the shift device is detected, the second shift command is accepted.

Method of controlling shifts in an automatic transmission

Growing community of inventors

Wako, Japan

Eiji Kitsutaka