A gearbox solenoid valve driving circuit and its control method

Abstract

The invention provides a transmission case electromagnetic valve driving circuit and a control method of a transmission case electromagnetic valve. The transmission case electromagnetic valve driving circuit comprises a microprocessor chip, a communication interface chip, an operational amplifier and a power switch tube. The control method of the transmission case electromagnetic valve comprises the steps that: an external control instruction is connected to the microprocessor chip through the communication interface chip; the external control instruction is transmitted to the microprocessor chip; after the microprocessor chip receives the external control instruction, the microprocessor chip calculates and outputs a PWM signal according to a predetermined driving algorithm, the PWM signal drives the power switch tube, and the driving control of the electromagnetic valve is realized; the current of the electromagnetic valve is collected through a sampling resistor; collected current is processed by the operational amplifier and then is outputted to the microprocessor chip, and the microprocessor chip adjusts the output of the PWM signal according to a current sampling value; and at the same time, the microprocessor chip outputs switch-on and switch-off states of the electromagnetic valve and real-time current value to an external control end through the communication interface chip.

Description

technical field [0001] The invention relates to the technical field of solenoid valves, in particular to a drive circuit and a control method for a gearbox solenoid valve. Background technique [0002] Pulse width modulation solenoid valves are widely used in hydraulic mechanical automatic transmissions. This solenoid valve has the advantages of fast response, strong anti-interference ability and high cost performance. The response speed and action accuracy of the solenoid valve applied in the gearbox system directly affect the shifting performance of the gearbox. In the gearbox system, it is not only required that the solenoid valve should respond quickly when it initially moves, but also requires the solenoid valve to be powered off. Timed deadlines can be responded quickly. In the process of shifting gears, the gearbox requires multiple solenoid valves to cooperate with each other, coordinate and coordinate, and accurately respond to control commands in order to accurate...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects existing in the prior art, the object of the present invention is to provide a gearbox solenoid valve drive circuit and its control method, which solves the problem that the current solenoid valve drive circuit cannot provide a communication interface, and the structure when multiple solenoid valves cooperate to act complicated question

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