HYBRID WORKING MACHINE AND CONTROLLING METHOD THEREOF
First Claim
1. A hybrid working machine comprising:
- an engine;
a variable displacement hydraulic pump connected to the engine;
a motor generator connected to the engine;
a control unit controlling the motor generator; and
wherein the control unit acquires a calculation value of the hydraulic pump based on a pump current supplied to the hydraulic pump and a discharge pressure of the hydraulic pump using a predetermined algorithm, corrects a hydraulic pump characteristic parameter used in the predetermined algorithm based on an assumed pressure error between the calculation value and an actual value of the hydraulic pump, calculates an assumed hydraulic pressure correction output using the corrected hydraulic pump characteristic parameter, and controls the motor generator based on the assumed hydraulic pressure correction output.
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Accused Products
Abstract
A control unit of a hybrid working machine calculates an actual hydraulic pressure output from the output of an engine (30) and the output of a motor generator (34), and calculates an assumed hydraulic pressure output (Win) as an output of a hydraulic pump (21) using a predetermined algorithm. The control unit corrects a hydraulic pump characteristic parameter used in the predetermined algorithm based on an assumed hydraulic pressure output error being a difference between an assumed hydraulic pressure output and an actual hydraulic pressure output, calculates an assumed hydraulic pressure correction output, and controls the motor generator (34) based on the assumed hydraulic pressure correction output.
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Citations
17 Claims
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1. A hybrid working machine comprising:
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an engine; a variable displacement hydraulic pump connected to the engine; a motor generator connected to the engine; a control unit controlling the motor generator; and wherein the control unit acquires a calculation value of the hydraulic pump based on a pump current supplied to the hydraulic pump and a discharge pressure of the hydraulic pump using a predetermined algorithm, corrects a hydraulic pump characteristic parameter used in the predetermined algorithm based on an assumed pressure error between the calculation value and an actual value of the hydraulic pump, calculates an assumed hydraulic pressure correction output using the corrected hydraulic pump characteristic parameter, and controls the motor generator based on the assumed hydraulic pressure correction output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control method for a hybrid working machine in which a hydraulic pump having a discharge flow rate changing characteristic inherent in a control signal is driven by an output of an engine, the control method comprising:
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correcting the control signal to bring a characteristic of the hydraulic pump closer to the discharge flow rate changing characteristic inherent in the control signal; calculating the output of the hydraulic pump based on the output of the corrected control signal; and controlling an output of a motor generator assisting the engine based on the calculated output of the hydraulic pump. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification