Method and device for buffering switch valve shifting impact and road walking machine
A technology of shifting impact and switching valves, which is applied in the direction of control devices, transportation and packaging, and vehicle parts, and can solve problems such as inconvenient operation and affecting construction efficiency
Inactive Publication Date: 2016-08-03
SANY HEAVY IND CO LTD (CN)
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Problems solved by technology
[0005] In view of this, the present invention aims to propose a method and device for cushioning the shifting impact of on-off valves and road walking machinery, so as to solve the problem that the existing road walking machinery shifting mode is inconvenient to operate and affects the construction efficiency
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[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the description and sequence of specific structures in this section are only descriptions of specific embodiments, and should not be considered as limiting the protection scope of the present invention.
[0043] The invention provides a method for cushioning the shifting impact of an on-off valve, the flow chart of which is as follows figure 1 shown, including:
[0044] Step 1, calculating the displacement ratio of the traveling motor before the gear shift and after the gear shift.
[0045] Step 2: Calculate the required current output value of the travel pump after shifting according to the displacement ratio before and after the shift of the travel motor.
[0046] Step 3, controlling the cor...
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The present invention relates to the technical field of road engineering machinery, and provides a method and device for cushioning the shifting impact of an on-off valve and a road walking machine. Displacement ratio; according to the displacement ratio before and after the shift of the travel motor, calculate the current output value required by the travel pump after shifting; control the corresponding electrified state of the switching valve after shifting; extend the travel The time of displacement change during the gear shifting period of the motor; the current output value is output according to the curvature corresponding to the displacement change during the gear shifting period of the traveling motor. Based on the existing electric system, the present invention is realized by software, has simple structure and low cost; the gear can be changed without stopping, and the operation is convenient; the control method has strong flexibility and is suitable for different hydraulic systems.
Description
technical field [0001] The invention relates to the technical field of road surface engineering machinery, in particular to a method and device for cushioning the shifting impact of an on-off valve and a road surface walking machine. Background technique [0002] At present, there is a four-wheel driving hydraulic drive mode for road walking machinery, that is, a proportional pump and two switch valves are used to control the driving. An on-off valve controls the displacement of the two front wheels, and an on-off valve controls the displacement of the two rear wheels. The displacement of the driving pump is adjusted through the current of the driving pump to realize the speed regulation function; the displacement of the four-wheel motor is adjusted through the switching of the two switching valves to realize gear shifting. [0003] Due to gear switching, the displacement of the four motors changes greatly. If you do not stop and change gears, it will cause a great impact, ...
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IPC IPC(8): B60K17/10
Inventor 陶源吴绪成王欢
Owner SANY HEAVY IND CO LTD (CN)