| 摘要 |
PROBLEM TO BE SOLVED: To adjust properly a hydraulic oil supply amount to hydraulically-driven equipment, while lowering the engine speed to the utmost for energy-saving operation.SOLUTION: A service car includes: an engine control unit 5A for setting the engine speed; a shift control unit 3 for adjusting the change gear ratio of a speed change gear 10; and a hydraulic pump P. An oil-pressure management unit 5 has: a necessary hydraulic oil amount calculation part for calculating a necessary hydraulic oil amount based on operation information to hydraulically-driven equipment HD; an engine speed increasing command generation part for giving an engine speed increasing command for increasing the engine speed to the engine control unit 5A when supply shortage of the hydraulic oil is determined; and a change gear ratio changing command generation part for giving to the shift control unit 3, a change gear ratio changing command for changing the change gear ratio so as to cancel increase of the engine speed in order to maintain service car speed. |
