CONTROL SYSTEM OF HYBRID CONSTRUCTION MACHINE
First Claim
1. A control system of a hybrid construction machine, comprising:
- two circuitry systems each having a main pump and an operation valve, the operation valve being configured to supply and discharge working fluid supplied from the main pump to an actuator through a main passage;
a main relief valve disposed in at least one of the two circuitry systems, the main relief valve being configured to maintain the working fluid pressure of the main passage at not more than a main relief pressure;
two regeneration passages each branching out between the main pump and the operation valve of the main passage of the two circuitry systems;
a regeneration motor for regeneration, configured to rotate by the working fluid guided through one of the regeneration passages of the two circuitry systems;
an assist pump configured to supply the working fluid to the two main passages via an assist passage by rotation with the regeneration motor interlockingly;
a regeneration passage switching valve configured to open and close one of the regeneration passages of the two circuitry systems; and
an assist switching valve interposed on the assist passage, the assist switching valve being configured to supply the working fluid supplied from the assist pump to at least one of the two regeneration passages, whereinthe regeneration passage switching valve includes a normal position where flow of the working fluid is blocked, and a regeneration position allowing for the working fluid to flow from the main passage to the regeneration motor when the working fluid pressure of the main passage reaches a set pressure lower than the main relief pressure during operation of the actuator, andthe assist switching valve includes a normal position proportionally dividing the working fluid of the assist passage into the two regeneration passages, a first switching position supplying more working fluid of the assist passage to one of the two main passages when that the one of the two main passages has a higher working fluid pressure, and a second switching position supplying more working fluid of the assist passage to the other one of the two main passages when that the other one of the two main passages has a higher working fluid pressure.
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Accused Products
Abstract
A control system of a hybrid construction machine includes a regeneration passage switching valve having a normal position where flow of working fluid is blocked, and a regeneration position allowing for the working fluid to flow from main passages to a regeneration motor when a working fluid pressure of the main passages reaches a set pressure during operation of the actuators, and an assist switching valve having a normal position proportionally dividing the working fluid of an assist passage into a regeneration passages, a first switching position supplying more working fluid of the assist passage to one of the main passages when that the one has a higher working fluid pressure, and a second switching position supplying more working fluid of the assist passage to the other one of the main passages when that the other one has a higher working fluid pressure.
12 Citations
6 Claims
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1. A control system of a hybrid construction machine, comprising:
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two circuitry systems each having a main pump and an operation valve, the operation valve being configured to supply and discharge working fluid supplied from the main pump to an actuator through a main passage; a main relief valve disposed in at least one of the two circuitry systems, the main relief valve being configured to maintain the working fluid pressure of the main passage at not more than a main relief pressure; two regeneration passages each branching out between the main pump and the operation valve of the main passage of the two circuitry systems; a regeneration motor for regeneration, configured to rotate by the working fluid guided through one of the regeneration passages of the two circuitry systems; an assist pump configured to supply the working fluid to the two main passages via an assist passage by rotation with the regeneration motor interlockingly; a regeneration passage switching valve configured to open and close one of the regeneration passages of the two circuitry systems; and an assist switching valve interposed on the assist passage, the assist switching valve being configured to supply the working fluid supplied from the assist pump to at least one of the two regeneration passages, wherein the regeneration passage switching valve includes a normal position where flow of the working fluid is blocked, and a regeneration position allowing for the working fluid to flow from the main passage to the regeneration motor when the working fluid pressure of the main passage reaches a set pressure lower than the main relief pressure during operation of the actuator, and the assist switching valve includes a normal position proportionally dividing the working fluid of the assist passage into the two regeneration passages, a first switching position supplying more working fluid of the assist passage to one of the two main passages when that the one of the two main passages has a higher working fluid pressure, and a second switching position supplying more working fluid of the assist passage to the other one of the two main passages when that the other one of the two main passages has a higher working fluid pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification