Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Shirou Godai

Yoshiharu Saito

Yasushi Inagawa

Norio Nakauchi

Hideo Koyama

Takanori Kon

Masamitsu Fukuchi

Noriyuki Yagi

Shinya Majikina

Takeo Furuta

Masamitsu Hirano

Kazumi Takagi

Hirotake Omoto

In a control apparatus for an automatic transmission having multiple speeds constituted by four sets and speed selecting mechanisms corresponding to the four sets, assuming the speeds as seven among eight speeds of A to H in order of gear ratio, the four sets are constituted by a first set of A having a largest gear ratio and C that is next but one; a second set including at least H having a smallest gear ratio; a third set of B and D between two of the first set; and a fourth set including two of E, F and G between the second and third sets, and one of first and second pressure regulators selectively supplies hydraulic pressure to two of the mechanisms corresponding to the first and second sets, while the other thereof selectively supplies hydraulic pressure to two of the mechanisms corresponding to the third and fourth sets.

Control apparatus for automatic transmission

A system for controlling an automatic transmission of a vehicle, wherein the initial value of the desired pressure to be supplied to a hydraulic clutch for the current gear now being engaged is determined appropriately, when conducting a power-on downshifting, so as to decrease the shift shock experienced by the vehicle occupant effectively, irrespectively of the change in the throttle opening, while ensuring to reduce the volume of the mapped data.

Control system for automatic vehicle transmissions

A control system, which creates a neutral condition if a vehicle is stationary with the brake of the vehicle being actuated and the accelerator for the engine being turned off while the transmission is set in a drive range, is equipped with a brake switch ( ), which detects the operational condition of the brake, and a output rotation sensor ( ), which detects the rotational speed of the output member of the transmission. If the control system detects the rotation of the output member by the output rotation sensor ( ), then the control system terminates the neutral condition in spite of the operational condition of the brake, which is detected by the brake switch ( ).

Control system for vehicular automatic transmission

When slipping is generated during the upshifting from a first gear shift stage to a second gear shift stage on ice or the like, a control for prohibiting the upshifting from the second gear shift stage to a third gear shift stage can be carried out precisely. A control system is designed so that when a slipping state is detected on ice having a lower road surface friction coefficient by a slipping state determining device, the upshifting of an automatic transmission from a second gear shift stage to a third gear shift stage is prohibited. In this control system, the time required for the upshifting from a first gear shift stage to the second gear shift stage is measured. If such time is shorter than a first predetermined time, it is determined that a slipping has been generated during the upshifting, and the upshifting from the second gear shift stage to the third gear shift stage is prohibited for a second predetermined time. Thus, even when the determination of the slipping state by the slipping-state determining device is not in time, the further upshifting of the automatic transmission is prohibited. Therefore, it is possible to reliably avoid the carrying-out of undesirable upshifting.

Control system for automatic transmission for vehicle

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Wako, Japan

Shirou Godai