CN-117759583-B - Pump valve matching control method, pump valve matching control system and controller

CN117759583BCN 117759583 BCN117759583 BCN 117759583BCN-117759583-B

Abstract

The application discloses a pump valve matching control method, a pump valve matching control system and a controller. The method comprises the steps of obtaining a handle command flow, outlet pressure of a variable pump and inlet and outlet pressure of an oil cylinder, determining load type and pump port control pressure of the oil cylinder according to the handle command flow and the inlet and outlet pressure when the handle command flow is larger than a preset value, determining a differential pressure margin of a pump valve matching control system according to the load type, correcting the pump port control pressure based on the differential pressure margin, and controlling pump displacement of the variable pump according to the corrected pump port control pressure and the outlet pressure of the variable pump. The application can identify working conditions in real time, and establishes pump valve matching modes according to different working conditions, thereby realizing the matching of different modes of pump port control pressure and load pressure, effectively reducing system energy consumption and improving response time. And between different devices, the variable pump mechanism does not need to be changed, and the application of different devices can be realized only by adjusting corresponding control parameters, so that the universality degree is higher.

Inventors

GUO JIDONG
FU LING
YUAN YE
WANG WEI
LU ZHIHENG
LIU RENYU

Assignees

中联重科股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220926

Claims (10)

1.A pump valve mating control method, characterized by being applied to a pump valve mating control system including a variable pump and an oil cylinder, the method comprising: acquiring a handle instruction flow, outlet pressure of the variable pump and inlet and outlet pressure of the oil cylinder; Under the condition that the handle instruction flow is larger than a preset value, determining the load type and the pump port control pressure of the oil cylinder according to the handle instruction flow and the inlet and outlet pressure; determining a differential pressure margin of the pump valve matching control system according to the load type; Correcting the pump port control pressure based on the differential pressure margin; controlling the pump displacement of the variable pump according to the corrected pump port control pressure and the outlet pressure of the variable pump; Wherein the determining the differential pressure margin of the pump valve matching control system according to the load type comprises: in case the load type is a negative load, determining the differential pressure margin as a preset margin value, and/or And under the condition that the load type is positive load, determining the differential pressure margin according to the handle instruction flow.
2. The pump valve matching control method according to claim 1, wherein the oil cylinder includes an oil inlet and an oil outlet, and the determining the load type of the oil cylinder according to the handle command flow and the inlet-outlet pressure when the handle command flow is greater than a preset value includes: Determining an oil inlet and an oil outlet of the oil cylinder according to the handle instruction flow; Determining the load type according to the pressure of the oil inlet and the pressure of the oil outlet; The inlet and outlet pressure of the oil cylinder comprises the pressure of the oil inlet and the pressure of the oil outlet.
3. The pump valve matching control method according to claim 2, wherein the determining the load type according to the pressure of the oil inlet and the pressure of the oil outlet includes: At the position of The load type is determined to be positive load; At the position of The load type is determined to be a negative load under the condition that t is not less than or equal to the preset value; Wherein, the Is the pressure of the oil inlet, Is the pressure of the oil outlet, For the oil inlet cavity area of the oil cylinder, The oil outlet cavity area of the oil cylinder is; A threshold is set for condition identification.
4. The pump valve matching control method according to claim 1, wherein determining a pump port control pressure from the handle command flow rate and the inlet-outlet pressure includes: In the case where the load type is positive load, the pump port control pressure satisfies the formula (1): ;(1) in the case where the load type is a negative load, the pump port control pressure satisfies the formula (2): ;(2) Wherein, the Controlling pressure for the pump port; the pressure of an oil inlet of the oil cylinder is set; the oil return pressure of the oil tank is set; setting the back pressure of the pressure control cavity; Is a differential pressure margin.
5. The pump valve matching control method according to claim 1, wherein the determining the differential pressure margin according to the handle command flow rate includes: Acquiring a flow variable, wherein the flow variable is the variable of the handle instruction flow in a set time; and determining the differential pressure margin according to the flow variation, wherein the flow variation is positively correlated with the differential pressure margin under the condition that the flow variation is larger than a first threshold.
6. The pump valve matching control method according to claim 5, characterized in that the determining the differential pressure margin from the flow rate variation amount includes: And under the condition that the flow variation is smaller than or equal to a first threshold value, determining the differential pressure margin according to the handle command flow, wherein the handle command flow is positively correlated with the differential pressure margin.
7. The pump valve matching control method according to claim 1, wherein the controlling the pump displacement of the variable pump according to the corrected pump port control pressure and the outlet pressure of the variable pump includes: Determining a difference between the corrected pump port control pressure and the outlet pressure of the variable displacement pump; And according to the difference value, regulating the pump displacement of the variable pump through a PID control system.
8. A controller for a vehicle, which is configured to control a controller, characterized by comprising the following steps: a memory configured to store instructions, and A processor configured to invoke the instructions from the memory and when executing the instructions is capable of implementing the pump valve matching control method according to any one of claims 1 to 7.
9. A pump valve match control system, comprising: A variable displacement pump; An oil cylinder; The controller of claim 8.
10. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the pump valve matching control method according to any one of claims 1 to 7.

Description

Pump valve matching control method, pump valve matching control system and controller Technical Field The application relates to the technical field of pump valve matching control, in particular to a pump valve matching control method, a pump valve matching control system and a controller. Background The existing pump valve matching method mainly comprises a load sensitive system, load pressure is detected in real time through a shuttle valve and is transmitted to a control end of a load sensitive valve LS, pump displacement is regulated through the load sensitive valve, and control is maintained in a relatively stable state, namely, pressure margin control is achieved between pump port pressure and load pressure through the load sensitive valve, so that flow balance of the pump valve is achieved. The mode realizes the effect of pump valve matching in a certain sense, and reduces the energy consumption of the system. However, the traditional load-sensitive system adopts a mechanical-hydraulic feedback control principle and has the defects of low stability, easy oscillation and the like. Disclosure of Invention The embodiment of the application aims to provide a pump valve matching control method, a pump valve matching control system and a controller, so as to solve the problems of low stability and easy oscillation caused by the adoption of a mechanical-hydraulic feedback control principle in a traditional load sensitive system for pump valve matching in the prior art. In order to achieve the above object, a first aspect of the present application provides a pump valve matching control method applied to a pump valve matching control system including a variable pump and an oil cylinder, the method comprising: acquiring a handle instruction flow, outlet pressure of a variable pump and inlet and outlet pressure of an oil cylinder; Under the condition that the handle instruction flow is larger than a preset value, determining the load type of the oil cylinder and the pump port control pressure according to the handle instruction flow and the inlet and outlet pressure; determining a differential pressure margin of a pump valve matching control system according to the load type; Correcting the pump port control pressure based on the differential pressure margin; And controlling the pump displacement of the variable pump according to the corrected pump port control pressure and the outlet pressure of the variable pump. In the embodiment of the application, the oil cylinder comprises an oil inlet and an oil outlet, and the determining the load type of the oil cylinder according to the handle command flow and the inlet and outlet pressure comprises: Determining an oil inlet and an oil outlet of the oil cylinder according to the handle instruction flow; Determining a load type according to the pressure of the oil inlet and the pressure of the oil outlet; The inlet and outlet pressure of the oil cylinder comprises the pressure of the oil inlet and the pressure of the oil outlet. In the embodiment of the application, the load type is determined according to the pressure of the oil inlet and the pressure of the oil outlet, and the method comprises the following steps: in the case of P O*AO/AI -PI < t, the load type is determined to be positive load; under the condition that P O*AO/AI-PI is more than or equal to t, determining the load type as negative load; Wherein P I is the pressure of an oil inlet, P O is the pressure of an oil outlet, A I is the oil inlet cavity area of the oil cylinder, A O is the oil outlet cavity area of the oil cylinder, and t is a working condition identification set threshold value. In an embodiment of the present application, determining a pump port control pressure according to a handle command flow and an inlet-outlet pressure includes: under the condition that the load type is positive load, the pump port control pressure satisfies the formula (1): P=PI+PVmar; (1) in the case where the load type is a negative load, the pump port control pressure satisfies the formula (2): P=PT+PVmar+P_S; (2) Wherein P is the control pressure of a pump port, P I is the pressure of an oil inlet of an oil cylinder, P T is the oil return pressure of the oil tank, P_S is the back pressure setting size of a pressure control cavity, and PV mar is the control pressure difference margin. In an embodiment of the present application, determining a differential pressure margin of a pump valve matching control system according to a load type includes: in the case that the load type is a negative load, the differential pressure margin is determined as a preset margin value. In an embodiment of the present application, determining a differential pressure margin of a pump valve matching control system according to a load type includes: In the case of a positive load type, a differential pressure margin is determined from the handle command flow. In an embodiment of the present application, determining a differential press