| 摘要 |
PURPOSE:To improve the startability of an engine and prevent an engine stop immediately after a start by judging the start state of the engine, and decreasing the discharge quantity of a variable-displacement pump driven by the engine at the time of a start. CONSTITUTION:When a controller 61 detects that an ignition key is operated to the Acc position with a sensor 70 under conditions of the lubricant temperature, engine temperature, water temperature, engine room temperature, hydraulic pump case temperature and outside air temperature at preset values or below respectively detected by temperature sensors 63, 64, 66, 67, 69 and 71, it judges as the start state of an engine and operates a solenoid valve 41 to decrease the discharge quantity of a variable-displacement hydraulic pump. CONSTITUTION:When the engine rotating speed detected by a sensor 62 is the preset value or below and a current sensor 68 detects that a starter is excited, it keeps the discharge quantity of the hydraulic pump small. The startability of the engine is improved, the operation immediately after a start is stabilized, and an engine stall can be prevented. |
