System and method for controlling engine revolutions for hybrid construction machine
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United States of America Patent
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Dec 29, 2015
Grant Date -
Mar 27, 2014
app pub date -
Oct 15, 2013
filing date -
Jul 29, 2009
priority date (Note) -
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Abstract
A system and method for controlling engine revolutions for a hybrid construction machine, including an engine, a hydraulic pump which is driven by the engine to drive a hydraulic actuator with discharged hydraulic fluid, a motor-generator which is driven by the engine to generate electricity and to drive the hydraulic pump as a motor supplementing the engine, an energy storage device which is charged with electric energy generated by the motor-generator and which supplies the electric energy for motor operation of the motor-generator, a torque detection unit for detecting an output torque of the hydraulic pump that is required to drive the hydraulic actuator, and a hybrid control unit for controlling the motor operation of the motor-generator to supplement the engine output if the change of the output torque of the hydraulic pump exceeds a predetermined level and it is determined that an engine revolution drop will occur.
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