Komatsu Corporation

Kazuhito Nishimaki

Tetsuo Kobayashi

Hitoshi Takahashi

Michihiro Aida

Osamu Kodama

Takafumi Takenaka

Noritoshi Takekuma

A motor grader includes an engine, a torque converter, a drive wheel, an engine revolution detector, and a control unit. The torque converter, including a lock-up clutch, transmits driving force from the engine. The drive wheel is rotationally driven by the driving force from the engine. The engine revolution detector detects engine revolution. When the lock-up clutch is engaged, the control unit is configured to: maintain the engaged state of the lock-up clutch when the engine revolution is greater than a predetermined lock-up release revolution lower than a low idle revolution; and switch the lock-up clutch into a disengaged state when the engine revolution is less than or equal to the predetermined lock-up release revolution.

Motor grader

Turning radius is calculated from steering angles of steering-wheels and articulation angles of respective frames, and the steering-wheels are automatically rotated faster than rear-wheels based on the turning radius, the revolution number of the rear-wheels, engine speed of an engine and a speed range of hydraulic motors, so that conventional trouble for manipulating operation lever etc. while turning a motor grader and skill-requiring work for adjusting the revolution number of the steering-wheels in accordance with the revolution number of the rear-wheels can be eliminated, thereby easily and accurately controlling the revolution number of the steering-wheels and securely preventing tight-corner braking phenomenon.

Steering-wheel revolution number correction system of all-wheel-drive vehicle

In a working vehicle, an electronic control regulating valve controls a connection force in clutch mechanisms and in a transmission , and a input side revolution signal of the transmission, an output side revolution signal, a speed stage position signal and a pedal angle signal of an inching pedal are inputted to control a slip in the transmission . Further, a pedal angle signal of an accelerator pedal is inputted to cope with a hyper-slow mode. Furthermore, in an engine, a charged pressure is controlled in stages to carry out an appropriate power control suitable for a number of stages of the transmission

Working vehicle and vehicle speed control method thereof, variable power engine and power setting method thereof, and vehicle with variable power engine and power control method thereof

In a working vehicle, an electronic control regulating valve controls a connection force in clutch mechanisms 35 and 36 in a transmission , and a input side revolution signal of the transmission, an output side revolution signal, a speed stage position signal and a pedal angle signal of an inching pedal are inputted to control a slip in the transmission . Further, a pedal angle signal of an accelerator pedal is inputted to cope with a hyper-slow mode. Furthermore, in an engine, a charged pressure is controlled in stages to carry out an appropriate power control suitable for a number of stages of the transmission

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Kashiwazaki, Japan

Kazuhito Nishimaki