某车型取力器控制功能故障机理探析

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中图分类号：U463.6 文献标识码：B 文章编号：1003-8639（2025）09-0161-03

alysisoftheFaultMechanismofthePowerTake-OffControlFunctioninaVehicleMod

Liu Junxin，Li Menghua，Yan Kuo，Wei Zhenxing，Zhang Guofeng （FAWJiefangAutomotiveCo.，Ltd.，Changchun13oo11，China）

【Abstract】With the development of commercial vehicle electrification，the interface matching problem between theintegratedcontrollerand the vehicle circuit is prone to causeloadcontrolfaults.Fortheabnormal driveand status fedback functionof thepower take-offofacertain model（the indicator lightsof the instrument panel and switch remain constantly ON when in theON position，andthe solenoid valve is closed without response），bycombiningthe internal interface circuitofthebodycontrolerandtheoverallelectrical circuitof thevehicle，thecauseofthefault was located throughcircuit disassembly，voltage calculationand software logic analysis： First，there is a parasitic ground inthe input interface circuit，which causes the indicator light to remain constantlyon; The second is the mismatch of thelogic parameters for voltage judgmentin theBCMsoftware.The third issue is that theoutput drive curentthreshold is relativelylow（theupperlimitof1Aislowerthantheratedcurentof1.5Aof thesolenoid valve， triggering false protection）.Basedonthis，animprovementscheme isproposed，which includesaddingannti-everse diode，optimizing the AD sampling logic （seting theconfiguration item to 1 and changing the preset state to LOW）， and correcting thecurrentthresholdto2A.After testing，thefault hasbeen completelyeliminated，which canprovide technical reference for the control circuit design ofsimilar vehicle models.

【Key words】PTO；state feedback；vehicle body controller;interface circuit matching

0 引言

随着商用车电气化技术的迭代升级，整车用电负载种类持续增加。（剩余3147字）