Flow valve and its position control method and control device

Abstract

The invention relates to a flow valve and its position control method and control device, which can improve system stability, safety and robustness, and save energy. The flow valve includes a valve sleeve and a valve core. The valve sleeve is provided with first and second oil return ports, oil supply ports, and first and second control ports in sequence. The valve core has first and second functional positions and a first , The second working position. When the flow valve is powered off and the spool is in the first functional position, the two control ports are respectively connected to the corresponding oil return ports, and the oil supply port is not connected to the two control ports; when the flow valve is powered on, the spool moves When it reaches the first working position, the second control port is in communication with the second oil return port, and the oil supply port is in communication with the first control port; The position is the same; when the flow valve is energized to move the spool to the second working position, the first control port is in communication with the first oil return port, and the oil supply port is in communication with the second control port.

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