| 摘要 |
PURPOSE:To turn with an optimum turning radius by controlling the exhaust guantity of an oil hydraulic pump in such a direction that the turning signal calculated from an average car speed signal, handle angle signal, engine speed signal, left and right motor revolution number signals approaches zero. CONSTITUTION:An average car speed V on the particular speed stage is calculated and a car speed signal (v) is output by a car speed calculating unit 50 based on an engine speed signal from an engine speed detector 15, a motor revolution number signal from left and right motor revolution number detectors 16, 17, and a speed stage signal from one of oil hydraulic switches 18-21 of individual speed stages. A turning signal I3 is output by a calculating unit 52 based on this car speed signal (v), a handle angle signal from a handle angle detector 12, said engine speed signal, and said motor revolution number signal. Singlas (i), (j) in such a direction that the turning signal I3 approaches zero by means of the turning signal I3 and a change lever position signal (c) are output to exhaust quantity control actuator 26, 27 of an oil hydraulic pump through adders 53, 54 so as to obtain an optimum turning radius. |
