Method and device for collecting multi-channel electromagnetic valve current

Abstract

The invention discloses a multi-channel electromagnetic valve current acquisition device which is composed of a single-chip microcomputer A / D processing module (1), a CAN communication module (2), a computer communication module (3), an amplifying circuit module (4), a sampling resistor module (5) and an external circuit module (6), wherein, a sampling resistor selects a precise resistor and is connected in series with an electromagnetic valve circuit which needs to be measured, the both ends thereof are respectively connected with a first-grade operational amplifier, the first-grade operational amplifier extracts the micro-pressure drop at the both ends of the sampling resistor and sends to a second-grade operational amplifier after the regulation of the adjustment amplification times ofthe resistor, a filter resistor and a filter capacitor carries out the filtration of the amplified signals, and the results are sent to the single-chip microcomputer A / D processing module. Then, the processed signals are sent to an upper computer through the CAN communication module. The invention further discloses a method for carrying out the acquisition by adopting the acquisition device. The multi-channel electromagnetic valve current acquisition device has the advantages of high negative voltage resistance, flexible adjustment of the amplification times, high communication speed and highsampling precision.

Description

technical field [0001] The invention relates to gearbox control, in particular to a multi-channel electromagnetic valve current acquisition device and acquisition method. Background technique [0002] In the automatic transmission control, the control of the solenoid valve is more and more important, and the quality of its control directly affects the comfort of the ride and the life of the mechanical body. Therefore, it is necessary to monitor the working conditions of the solenoid valve in real time during the calibration process of the control software, and adjust the control variables to obtain the best control strategy. The solenoid valve is an inductive load, and its control generally adopts PWM (pulse width modulation) control technology, which has relatively high requirements for sampling. The general sampling circuit is difficult to meet the high-speed changing current in the circuit and the high negative pressure impact generated when the solenoid valve is turned ...

AI Technical Summary

Problems solved by technology

The general sampling circuit is difficult to meet the high-speed changing current in the circuit and the high negative pressure impact generated when the solenoid valve is turned off, and due to the harsh electromagnetic environment in the car, it is also difficult to communicate with the host computer in real time and reliably

When it is necessary to sample multiple current signals at the same time, the sampling will be out of sync and the data will be distorted

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