Physical gear acquisition system and acquisition method for pure electric light commercial vehicle

Abstract

The invention discloses a physical gear acquisition system for a pure electric light commercial vehicle. The system comprises a vehicle control unit and an electronic gear shifter connected with the vehicle control unit through a CAN bus; the vehicle control unit is connected with a first I / O output port hard wire and a second I / O output port hard wire through a first I / O input port and a second I / O input port respectively, wherein the first I / O output port hard wire and the second I / O output port hard wire are arranged on the electronic gear shifter; the electronic gear shifter is used for judging a real-time physical gear according to an analog voltage signal and then transmitting the real-time physical gear to the vehicle control unit through the CAN bus and the hard wires; and the vehicle control unit is used for carrying out open circuit, to-ground short circuit and to-power supply short circuit fault diagnosis on the first I / O input port and the second I / O input port through thereal-time physical gear signal transmitted by the CAN bus when communication with the electronic gear shifter is normal, and determining an output physical gear according to fault diagnosis information and the real-time physical gear signal transmitted by the hard wire when the communication with the electronic gear shifter fails. With the physical gear acquisition system adopted, the normal running of a vehicle in the case of communication failure is ensured. The physical gear acquisition system has the advantages of structural simplicity and easiness in implementation.

Description

technical field [0001] The invention belongs to the technical field of automobile control, and in particular relates to a physical gear acquisition system and acquisition method of a pure electric light commercial vehicle. Background technique [0002] With the electronic development of new energy vehicles, smart cars and traditional power vehicle shift control systems, more and more vehicles use electronic shifters. The main function of the electronic shifter is to accept the driver's shifting demand, convert the driver's shifting operation action into electrical signals through the position sensor, etc., and the electronic shifter EGSM receives these electrical signals, and recognizes them as Different shift position signals are encoded, and then output to the vehicle controller VCU through the CAN bus, so that the VCU can collect physical gear information. This method of collecting physical gear positions only through the CAN bus cannot guarantee the normal driving of th...

AI Technical Summary

Problems solved by technology

This method of collecting physical gear positions only through the CAN bus cannot guarantee the normal driving of the vehicle when the communication between the VCU and the electronic shifter fails.

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