| 摘要 |
PROBLEM TO BE SOLVED: To provide good fuel consumption and a wide speed range by making inputs from an engine speed detection means, a vehicle speed detection means, a forward/reverse selection means, a running control mode selection means and a constant low speed running setting means for controlling a hydraulic pump and a hydraulic motor and conducting ordinary running or constant low speed running. SOLUTION: A speed command value is set with a potentiometer 9, and the output of an engine 1 with an accelerator pedal 8 rotates a hydraulic pump 3 for running through a gear train 2. The mechanism of the gear train 2 is formed with the rotational speed detection means 13 of the engine 1, and an iron wheel 6 is formed with a vehicle speed detection means 16 to transmit all of them to a control circuit 12. The control circuit 12 calculates the displacement of each of the hydraulic pump 3 for running and the hydraulic motor 4 for running to control the openings of proportional control valves 14, 15 and drive the iron wheel 6. It is thus possible to provide stable running at a designated speed. |
