Flow valve, position control method of flow valve, and control device

Abstract

The invention relates to a flow valve, a position control method of the flow valve, and a control device, and can improve the system stability, security and robustness and save energy. The flow valvecomprises a valve sleeve and a valve core; first and second oil return holes, an oil supply hole and first and second control holes are sequentially arranged on the valve sleeve at intervals; the valve core has first and second functional positions and first and second working positions; when the flow valve is powered off and the valve core is at the first functional position, the two control holes are respectively communicated with the corresponding oil return holes; the oil supply hole is not communicated with both the two control holes; when the flow valve is powered on and the valve core moves to the first working position, the second control hole keeps communication with the second oil return hole; the oil supply hole is communicated with the first control hole; when the flow valve ispowered on and the valve core moves to the second functional position, the condition is the same as the condition at the first functional position; when the flow valve is powered on and the valve core moves to the second working position, the first control hole keeps communication with the first oil return hole; and the oil supply hole is communicated with the second control hole.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a flow valve and its position control method and control device. Background technique [0002] The automatic shifting of passenger cars usually adopts the scheme of dual-clutch automatic transmission, and the dual-clutch automatic transmission uses the structure of shift fork and synchronizer to realize the pre-combination of transmission gears. Generally, the position and speed of the shift fork are controlled by a double-acting hydraulic cylinder, and the oil in the two chambers of the double-acting hydraulic cylinder is controlled by a flow valve, so as to realize smooth shifting. [0003] Most of the current flow valves are three-position four-way proportional flow valves (referred to as flow valves), which are equipped with an oil return port, an oil supply port and two control ports. In actual use, the electromagnetic force generated by the electromagnetic force on one side...

AI Technical Summary

Problems solved by technology

[0004] First, when the control system is unexpectedly powered off, the oil supply port will be connected to one of the control ports to output flow and pressure, causing the hydraulic system to lose control;

[0005] Second, when the double-acting hydraulic cylinder is not used, it is necessary to continuously input a certain amount of current to the flow valve so that the two control ports return oil at the same time, resulting in a waste of system energy

Images