| 摘要 |
PROBLEM TO BE SOLVED: To provide a working vehicle wherein car speed is adjusted to a constant low speed side, and engine stop is prevented effectively. SOLUTION: In a motor grader, when starting levelling work by means of blades of the motor grader running at a low speed from an idling state at a low idling, constant speed control is done. This keeps the actual engine speed of an engine 5 to a desired engine speed lower than a low idling engine speed by a specified engine speed for performing levelling work while keeping car speed constant at a low speed. Even if a load on the engine 5 is increased resulting in the reduction of its actual engine speed like in the case where the up-grade of levelling face becomes severe during levelling work or excavating quantity is increased temporarily due to partial ruggedness, however, the operator can continue his or her levelling work by restoring actual engine speed to the desired engine speed immediately. This prevents engine stop. COPYRIGHT: (C)2004,JPO
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