| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a working vehicle that can prevent engine failure by reducing engine speed and reducing vehicle speed when load is heavy, and can run by low fuel consumption suppressing raise of engine speed when load is light. <P>SOLUTION: The working vehicle has a heavy load mode and a light load mode. In the heavy load mode, an engine speed change actuator 93 and a variable speed actuator 91 are controlled to increase engine speed Nr, when an engine load factor L becomes larger than the set heavy load value L1, while holding the vehicle speed V constant, and to decrease the vehicle speed V, when the engine load factor L becomes larger than the set heavy load value L2 after the engine speed Nr has increased to an engine speed upper limit value Nmax. In the light load mode, the engine speed change actuator 93 and the variable speed actuator 91 are controlled to decrease the engine speed Nr, when the engine load factor L becomes smaller than the set light load value L4, while holding the vehicle speed V constant. <P>COPYRIGHT: (C)2012,JPO&INPIT |
