HYBRID CONSTRUCTION MACHINE
First Claim
1. A hybrid construction machine comprising:
- a prime mover;
a hydraulic pump driven by the prime mover;
a swing structure;
an electric motor for driving the swing structure;
a hydraulic motor for driving the swing structure, and the hydraulic motor being driven by the hydraulic pump;
an electricity storage device connected to the electric motor;
a swing control lever device which outputs a command regarding the driving of the swing structure;
a control device which switches a swing mode regarding the driving of the swing structure between;
a hydraulic/electric hybrid swing mode for driving the swing structure by total torque of the electric motor and the hydraulic motor by driving both the electric motor and the hydraulic motor when the swing control lever device is operated, anda hydraulic-alone swing mode for driving the swing structure by the torque of the hydraulic motor alone by driving only the hydraulic motor when the swing control lever device is operated.
1 Assignment
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Accused Products
Abstract
A hybrid construction machine is capable of performing satisfactory operations even when trouble occurs that disables the electric motor from outputting torque. The hybrid construction has both a hydraulic motor and an electric motor driving the swing structure and a controller for switching between a hydraulic/electric hybrid swing mode (using both the hydraulic motor and the electric motor) and a hydraulic-alone swing mode (using only the hydraulic motor). The switching is executed while achieving satisfactory operability and performance in each mode. Normally, an energy saving operation is performed in the hydraulic/electric hybrid swing mode. When the electric amount of an electricity storage device has gone out of a prescribed range or an abnormality has occurred in an electric system (e.g., failure of an inverter), the swing mode is switched to the hydraulic-alone swing mode so that driving with normal braking torque is possible by the hydraulic motor alone.
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Citations
15 Claims
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1. A hybrid construction machine comprising:
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a prime mover; a hydraulic pump driven by the prime mover; a swing structure; an electric motor for driving the swing structure; a hydraulic motor for driving the swing structure, and the hydraulic motor being driven by the hydraulic pump; an electricity storage device connected to the electric motor; a swing control lever device which outputs a command regarding the driving of the swing structure; a control device which switches a swing mode regarding the driving of the swing structure between; a hydraulic/electric hybrid swing mode for driving the swing structure by total torque of the electric motor and the hydraulic motor by driving both the electric motor and the hydraulic motor when the swing control lever device is operated, and a hydraulic-alone swing mode for driving the swing structure by the torque of the hydraulic motor alone by driving only the hydraulic motor when the swing control lever device is operated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification