| 摘要 |
PROBLEM TO BE SOLVED: To give moderate tension to a driver during operation of a tracking running gear so that braking operation can be easily conducted and to start the vehicle based on the driver's will without switching operation by the driver. SOLUTION: This tracking running gear includes a lower limit vehicle speed setting means M5 and an upper limit vehicle speed setting means M6 for previously setting a lower limit vehicle speed and an upper limit vehicle speed to control a vehicle speed by a vehicle speed control means M4, and a control start commanding means 33 for instructing the vehicle speed control means M4 to start the vehicle speed control upon operation by the driver. The vehicle speed control means M4 is adapted to discontinue vehicle speed control at a vehicle speed between the lower limit vehicle speed and a vehicle speed in a stopped state, thereby permitting vehicle speed control conducted by the driver, and to carry out the vehicle speed control at a vehicle speed exceeding the lower limit vehicle speed in a state in which accelerating or decelerating operation is not conducted by the driver. The vehicle speed control means M4 is also adapted to ensure that the vehicle speed control is discontinued when the vehicle speed becomes a level equal to or higher than the upper limit vehicle speed, and the vehicle speed control is suspended until the operation of the control start commanding means 33 is conducted even if the vehicle speed is lower than the upper limit vehicle speed. COPYRIGHT: (C)2004,JPO |
