Plug-controlled vehicle-mounted electrical control system program download circuit

Abstract

The invention relates to a plug-controlled vehicle-mounted electrical control system program download circuit. The circuit comprises an electrical control system download on-off control circuit and a special download plug, wherein the electrical control system download on-off control circuit consists of an analogue switch MAX4066; under the control of the special download plug, a thirteenth pin IN1 and a fifth pin IN2 of the MAX4066 are grounded; two channels of a first pin NO1 and a second pin COM1 as well as a third pin NO2 and a fourth pin COM2 are switched on respectively so as to download a program; the special download plug is connected with a CPU downloader and comprises an RESET pin, a BKGD pin, a GND pin, a VCC pin and a CONTRL pin; the CONTRL pin on the plug is short connected with the GND pin; after the plug is inserted into an electrical control system download connector, the program can be downloaded; and after the plug is pulled out, a download port of the CPU is disconnected with the download connector; therefore, the convenience of modifying the program and the anti-interference characteristic during the operation of the CPU are improved.

Description

technical field [0001] The invention relates to a program downloading circuit of a vehicle electric control system, in particular to a circuit which can be switched on and off by a download plug. Background technique [0002] Some on-board electronic control systems need to update the program frequently during the debugging stage. In order to meet the requirements of installation reliability and anti-interference, it is necessary to fix and install the housing after the program is updated, which will lead to repeated opening of the housing. For program programming, if the electronic control system is installed in an inconvenient location such as the engine compartment or inside the power battery box, it will cause great inconvenience to the program update. Although throwing the downloading harness out of the circuit board of the electronic control system for a long time can solve the problem of the inconvenience of downloading the program, but because of the antenna effect o...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the existing on-board electronic control system program download that needs to repeatedly open the electronic control unit housing or throw out the program download wire harness for a long time to introduce interference signals, and propose a circuit that uses an analog switch to control the program download line on and off

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