Kabushiki Kaisha Komatsu Seisakusho

Kiyoshi Kaneko

Takeo Kato

Yoshiaki Kato

Kohei Kusaka

Masahiro Watanabe

Yasunori Okura

Kazuo Takagi

Shingo Kobayashi

Kohei Soka

A method for automatically changing the speed of a dump truck for use as a construction vehicle which is capable of improving the fuel cost by utilizing the engine output effectively and efficiently, improving the durability of the power transmission system and giving the driver a comfortable ride. According to this automatic speed change method, a desired, optimum speed stage which meets the loading condition of the dump truck and/or the engine output condition can be selected by using controllers each having a built-in computer.

Method of automatically changing the speed stage of a vehicle based on

A method of controlling speed changes in a hydraulically actuated type multiple-stage speed change gear, which renders it possible to prevent the occurrence of 'shift hunting' without impairing the acceleration characteristics of the vehicle and also reduce the magnitude of shocks which occur at the time of speed changes even in case hydraulic clutches of small capacity are used. According to this method of controlling speed changes, a controller (30) is used to conduct speed changes when conditions for speed changes, i.e., upshift/downshift are satisfied, and in cases where a downshift is made after an upshift and an upshift is made after a downshift, speed changes are conducted after the lapse of a long speed change inhibiting time, and in other cases than the aforementioned, speed changes are conducted after the lapse of a short speed change inhibiting time. Further, only in case the vehicle is decelerated from a high speed stage to a coasting speed, deceleration operations are conducted with a direct coupled clutch (8) of the torque converter (3) kept in engaged condition, and in other cases than the aforementioned, speed changes are conducted with the direct coupled clutch kept in released condition.

Method of controlling speed changes in hydraulically actuated type

Method of automatically changing the speed stage of a construction

A desired speed stage is preselected and at a time when a car speed reaches a speed commensurate with the preselected speed stage, a present speed stage is changed to the preselected speed stage.

Electronically controlled automatic speed changing apparatus

Starting speed stage selector in automatic transmission control system

Growing community of inventors

Kanagawa, Japan

Kiyoshi Kaneko