混合动力工程机械

Hybrid construction machine

Abstract

提供一种混合动力工程机械,其能够抑制基于电动/发电机进行的不必要的发动机的动力辅助。本发明的混合动力工程机械具有:检测发动机(11)的转速NE的发动机转速传感器(11A);判定发动机(11)的输出转矩TE的状态的发动机状态判定部(20B);运算液压泵(13)的负载转矩TP的负载转矩推定部(20C);和发动机辅助限制部(20E),其在由发动机转速传感器(11A)检测到的转速NE为转速N0以上,且由发动机状态判定部(20B)判定为发动机(11)的输出转矩TE处于没有达到最小转矩Tmin的状态的情况下、或者由负载转矩推定部(20C)运算的负载转矩TP比转矩T1低的情况下,限制基于电动/发电机(12)进行的发动机(11)的动力辅助。
The invention provides a hybrid construction machine capable of suppressing unnecessary motive power assistance to an engine based on a motor/electric generator. The hybrid construction machine has an engine rotation speed sensor 11A to detect a rotation speed NE of an engine 11, an engine state determination unit 20B to determine the state of output torque TE of the engine 11, a load torque estimation unit 20C to calculate load torque TP of a hydraulic pump 13, and an engine assistance limiting unit 20E to, when the rotation speed NE detected with the engine rotation speed sensor 11A is equal to or greater than a rotation speed N0, and the engine state determination unit 20B determines that the output torque TE of the engine 11 has not become minimum torque Tmin, or the load torque TP calculated with the load torque estimation unit 20C is lower than torque T1, limit motive-power assistance with the motor generator 12 to the engine 11 based on the motor/electric generator.

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