Control device and control method for pneumatic automated mechanical transmission gear shifting force

Abstract

The invention relates to a control device and control method for a pneumatic automated mechanical transmission gear shifting force. The control device for the pneumatic automated mechanical transmission gear shifting force comprises a structure characterized in that a control valve piston is connected with a push rod, and the control valve piston slides cooperatively in a hollow valve body so as to divide the valve body into a left cavity and a right cavity. A first air inlet and a first interface communicating with the left cavity, as well as a second air inlet and a second interface communicating with the right cavity are formed in the valve body; quick exhaust valves are arranged at two ends of the control valve piston; a first electromagnetic valve and a second electromagnetic valve communicate with the first interface and the second interface, and inflate a double-piston gear shifting air cylinder through a control valve; the push rod is pushed to move leftwards or rightwards so as to engage a gear and shift the gear, and drive the control valve piston sliding in the valve body to synchronously move at the same time; and the pressure in the double-piston air cylinder is adjusted cooperatively, so that an acting force after gear shift is reduced. The device provided by the invention solves the problems of excessive impact force, big gear shifting noise and easiness in damage of an original gear shifting actuator, and has the characteristics of simple structure, small gear shifting impact force, low noise, difficulty in damage, convenience in operation, no need of position detection, flexibility and reliability.

Description

technical field [0001] The invention belongs to the technical field of vehicle transmission control, and relates to a device and method for controlling shift force of a pneumatic mechanical automatic transmission. Background technique [0002] With the development of automobile technology, automatic transmissions have been widely used in various vehicles. Electronically controlled pneumatic mechanical automatic transmissions are widely used due to their simple structure, high transmission efficiency, large shifting force, and good reliability. [0003] The pneumatic shift actuator selects the shift timing and controls the shift action through the transmission control unit TCU, and uses the compressed air in the cylinder as the shift power. Push the push rod to move left or right through the air inlet and exhaust port to do work to control gear shifting. The double-piston cylinder is widely used because it can accurately realize three-position control. [0004] The transmi...

AI Technical Summary

Problems solved by technology

However, the above-mentioned solutions all require accurate measurement of displacement or cylinder pressure, and will increase the difficulty of system control

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