Yanmar Co., Ltd.

Keiichirou Yuzaki

Takeshi Oouchida

Tadao Hirai

Koji Iwaki

Takashi Miyamoto

Akifumi Kuroda

Minoru Kamada

Koji Sakata

In a working vehicle provided with an engine which is mounted to a travel machine body, a common rail type fuel injection device which injects fuel to the engine, a continuously variable transmission which shifts power from the engine, and the exhaust gas purification device which is arranged in an exhaust system of the engine, in the case that an engine operating point Q relating to a rotating speed N and a torque T of the engine is in a low-speed and low-torque side incapable of self-renewing the exhaust gas purification device, the engine operating point Q is changed to a high-speed and low-torque side capable of self-renewing the exhaust gas purification device, and a change gear ratio of the continuously variable transmission is changed and regulated in such a manner that a vehicle speed V of the travel machine body is not changed.

Drive system control device for working vehicle

In a working vehicle, there is dissolved a risk that a black smoke is discharged, a knocking is generated and an engine stall is caused, if a lot of load is applied to a rotary tiller during various works while traveling at a low speed. In the working vehicle provided with an engine which is mounted to a travel machine body, a common rail type fuel injection device which injects fuel to the engine, and a continuously variable transmission which shifts power from the engine, an engine driving point Q (Q&#x2192;Q) relating to a rotating speed N and a torque T of the engine is changed in such a manner that the rotation speed come to a high speed side rotating speed Ndissolving an overload, and a change gear ratio of the continuously variable transmission is modified and regulates in such a manner that a vehicle speed V of the travel machine body does not change in the case that the overload acts on the engine of having a low speed Nin the rotating speed N.

Growing community of inventors

Osaka, Japan

Keiichirou Yuzaki