Hydraulic pump control system, vehicle and its steering hydraulic system
A control system and hydraulic pump technology, which is applied to fluid pressure actuation system components, fluid steering mechanisms, fluid pressure actuation devices, etc., and can solve problems such as waste of energy and system heating
Active Publication Date: 2015-08-26
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
However, most of the time, the vehicle does not work in this state but at a high speed. At this time, when the engine moves at a high speed, the output flow of the hydraulic pump driven by it will be larger, which will cause redundant The flow will be converted into heat in the form of high pressure loss, which will cause the system to heat up on the one hand and waste energy on the other hand
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[0041] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention.
[0042] First of all, it needs to be explained that the present invention relates to the field of hydraulic control, and those skilled in the art can understand that the mentioned "oil passages" such as oil supply passages can be realized through pipelines between components, or through components The implementation of the internal flow channel, etc., is not limited in the present invention.
[0043]The following uses the hydraulic steering system in the vehicle provided by the present invention as an example, and introduces the hydraulic pump control system provided by the present invention in conjunction with the accompanying drawings. It should be noted that the application of...
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The invention discloses a hydraulic pump control system. The hydraulic pump control system comprises a plurality of hydraulic pumps and main oil supply paths which are driven by the same power source and are mutually connected in parallel; the plurality of hydraulic pumps can supply oil to the main oil supply paths through respectively oil supply paths; a throttling device is arranged on the oil supply path of one of the plurality of hydraulic pumps; fuel return reversing valves are connected in series or bypass on at least one oil supply path of other hydraulic pumps; the fuel return reversing valve can control corresponding hydraulic pumps to selectively supply oil to the main oil supply path or return oil to an oil tank; and the fuel return reversing valve is controlled by differential pressure between the inlet and outlet of the throttling device. The invention further discloses a steering hydraulic system of a vehicle of the hydraulic pump control system, and a vehicle using the steering hydraulic system. Thus, through the differential pressure between the inlet and outlet of the throttling device, the fuel return reversing valve can be controlled to directly back flow the output flow of the corresponding hydraulic pump to the oil tank; and the energy loss problem caused by overlarge output flow can be avoided.
Description
technical field [0001] The present invention relates to the field of hydraulic pump control, in particular to a steering hydraulic system using the hydraulic pump control system and a vehicle using the steering hydraulic system. Background technique [0002] As is known, hydraulic pumps in hydraulic systems are usually driven by engines or motors to convert mechanical energy into hydraulic energy and output flow to meet system needs, and their output flow capacity is determined by their displacement; the actuator is usually a hydraulic cylinder and a hydraulic pump The speed of the motor's action determines the flow it needs. However, in some systems, there will be the following contradiction between supply and demand of the flow: when the output flow of the hydraulic pump is insufficient, it will cause the actuator to move slowly and cause the corresponding abnormal operation; in addition, when the output flow of the hydraulic pump is much larger than the system If it is r...
Claims
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IPC IPC(8): F15B21/00F15B13/02B62D5/06
Inventor 詹纯新刘权郭堃
Owner ZOOMLION HEAVY IND CO LTD