METHOD OF CONTROLLING HYBRID CONSTRUCTION MACHINE AND HYBRID CONSTRUCTION MACHINE
First Claim
1. A method of controlling a hybrid construction machine provided with an engine and a generator motor coupled to each other, a swing motor which electric power is supplied to from the generator motor for swinging a part of a body relative to other parts, a capacitor for storing the electric power generated by each of the generator motor and the swing motor and supplying the electric power to the generator motor and the swing motor, and a booster for boosting voltage of the capacitor to output, the method comprising:
- an assist torque limit value calculating step of calculating an assist torque limit value of the generator motor corresponding to capacitor voltage of the capacitor when the booster performs an output associated with discharge of the capacitor;
a generator motor torque command value calculating step of calculating a torque command value of the generator motor according to a target speed of the generator motor; and
a generator motor actual torque command value generating step of comparing the assist torque limit value calculated at the assist torque limit value calculating step with the torque command value calculated at the generator motor torque command value calculating step, and generating an actual torque command value of the generator motor by using the smaller of the assist torque limit value and the torque command value.
1 Assignment
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Accused Products
Abstract
A method of controlling a hybrid construction machine capable of preventing a system from being rendered inoperative without increasing a capacitance of a capacitor and of inhibiting delay of a swing operation relative to an operation command at the time of swing operation, and the hybrid construction machine are provided. For this purpose, at the time of discharge of the capacitor, actual torque command values are respectively generated by referring to an assist torque limit value corresponding to capacitor voltage of a generator motor and a swing power running torque limit value corresponding to the capacitor voltage of a swing motor, as well as, at the time of charge of the capacitor, an actual target output value of the generator motor is generated.
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Citations
10 Claims
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1. A method of controlling a hybrid construction machine provided with an engine and a generator motor coupled to each other, a swing motor which electric power is supplied to from the generator motor for swinging a part of a body relative to other parts, a capacitor for storing the electric power generated by each of the generator motor and the swing motor and supplying the electric power to the generator motor and the swing motor, and a booster for boosting voltage of the capacitor to output, the method comprising:
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an assist torque limit value calculating step of calculating an assist torque limit value of the generator motor corresponding to capacitor voltage of the capacitor when the booster performs an output associated with discharge of the capacitor; a generator motor torque command value calculating step of calculating a torque command value of the generator motor according to a target speed of the generator motor; and a generator motor actual torque command value generating step of comparing the assist torque limit value calculated at the assist torque limit value calculating step with the torque command value calculated at the generator motor torque command value calculating step, and generating an actual torque command value of the generator motor by using the smaller of the assist torque limit value and the torque command value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hybrid construction machine provided with an engine and a generator motor coupled to each other, a swing motor which electric power is supplied to from the generator motor for swinging a part of a body relative to other parts, a capacitor for storing the electric power generated by each of the generator motor and the swing motor and supplying the electric power to the generator motor and the swing motor, and a booster for boosting voltage of the capacitor to output, comprising:
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a capacitor voltage measuring unit for successively measuring capacitor voltage of the capacitor; and a controlling unit for calculating an assist torque limit value of the generator motor corresponding to the capacitor voltage measured by the capacitor voltage measuring unit, while calculating a torque command value of the generator motor according to a target speed of the generator motor, and for comparing the assist torque limit value with the torque command value of the generator motor, and generating an actual torque command value of the generator motor to output by using the smaller of the assist torque limit value and the torque command value of the generator motor, when the booster performs an output associated with discharge of the capacitor. - View Dependent Claims (9, 10)
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Specification