| CPC F15B 15/00 (2013.01) [E02F 9/123 (2013.01); E02F 9/2228 (2013.01); E02F 9/2267 (2013.01); E02F 9/2285 (2013.01); E02F 9/2296 (2013.01); E02F 9/26 (2013.01); F15B 13/044 (2013.01); F15B 19/005 (2013.01)] | 16 Claims |
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1. A novel rotation control method for an excavator, the novel rotation control method being carried out by a novel rotation control system for an excavator, the novel rotation control system comprising a controller, an electrical control handle and an instrument which are electrically connected to the controller, and a rotating motor, a rotating valve trim and a main pump which are sequentially connected in series, wherein a first electromagnetic valve and a second electromagnetic valve are disposed at two ends of the rotating valve trim respectively, and the first electromagnetic valve and the second electromagnetic valve are electrically connected to the controller; the first electromagnetic valve is also connected to a first pilot pressure sensor, the first pilot pressure sensor is used for detecting a pressure of the first electromagnetic valve and feeding the pressure of the first electromagnetic valve back to the controller, the second electromagnetic valve is also connected to a second pilot pressure sensor, and the second pilot pressure sensor is used for detecting a pressure of the second electromagnetic valve and feeding the pressure of the second electromagnetic valve back to the controller; a rotation sensor is disposed in the controller and is used for detecting whether an excavator is rotating;
the novel rotation control system further comprising a regulator, and the regulator being used for receiving an instruction from the controller to control a displacement of the main pump;
the novel rotation control system further comprising an overflow valve and a one-way valve which are disposed between the rotating motor and the rotating valve trim, and the overflow valve being used for receiving redundant oil from the main pump and delivering the redundant oil from the main pump to a low-pressure side of the rotating motor;
the novel rotation control system further comprising a temperature sensor disposed in the rotation control system, and the temperature sensor being used for monitoring a temperature of hydraulic oil in real time,
wherein the novel rotation control method comprises a fault determination method of the rotation control system, which comprises: detecting a secondary pressure of the first electromagnetic valve and the second electromagnetic valve by the first pilot pressure sensor and the second pilot pressure sensor respectively, and diagnosing whether the first electromagnetic valve and the second electromagnetic valve are abnormal according to the temperature of the hydraulic oil and an actual relationship between a current actually output to the first electromagnetic valve and the second electromagnetic valve by the controller and the secondary pressure output by the first electromagnetic valve and the second electromagnetic valve and correcting an abnormality, by the controller,
when it is monitored that the excavator is working under a low temperature condition, the controller sends an instruction to increase an output current of the first electromagnetic valve and the second electromagnetic valve at the beginning of rotation to compensate for a time loss caused by a longer pilot pressure building time of the first pilot pressure sensor and the second pilot pressure sensor and a longer reversing time of the valve trim.
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