发明名称 HYDRAULIC PUMP CONTROL DEVICE FOR RUNNING WORKING VEHICLE WITH TORQUE CONVERTER
摘要 PURPOSE:To effectively utilize the engine output by controlling the discharge capacity of a variable-capacity hydraulic pump so that the reduction rate of the discharge capacity is increased as the engine rotating speed is decreased by a load when the command value is constant. CONSTITUTION:A pump regulator 28 sets the discharge capacity of a variable- capacity hydraulic pump 24 based on the rotating speed detected by a throttle 29 detecting the actual rotating speed of an engine 21 and the command value of the target rotating speed by an accelerator pedal 31. The pump regulator 28 controls the discharge capacity of the variable-capacity hydraulic pump 24 so that the reduction rate of the discharge capacity is increased as the engine rotating speed is decreased by a load when the command value is constant as compared with the reduction rate of the discharge capacity as the engine rotating speed is decreased by the reduction of the command value. When the work load is made larger than the engine output torque and the engine rotating speed is made smaller than the target rotating speed, the pump capacity is decreased by the amount proportional to the rotating speed deviation, and the running torque is increased by that much.
申请公布号 JPH0427784(A) 申请公布日期 1992.01.30
申请号 JP19900133324 申请日期 1990.05.23
申请人 HITACHI CONSTR MACH CO LTD 发明人 OKUI HISAO;KANAI TAKASHI;NAKAMURA HIROYUKI;TAKAHASHI TOMOO;TAKAGI HISAO
分类号 E02F9/22;E02F9/20;F02D29/04;F04B49/00 主分类号 E02F9/22
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