论文部分内容阅读
故障现象一辆2002年产雷克萨斯ES300车,搭载1MZ-FE发动机,行驶里程约为26.3万km。据驾驶人反映,该车最近在加速时车身有共振现象,为此已更换过多个配件,但仍然没有找到故障原因。故障诊断试车验证故障,发现发动机在怠速运转时,驾驶室内有“嗡嗡”声,原地缓慢加速到1 000 r/min,“嗡嗡”声增大,并且加速踏板也能感觉到有振动;当发动机转速超过1 000 r/min时“嗡嗡”声消失;继续踩下加速踏板使发动机转速达到1 600 r/min,驾驶室内再次出现“嗡嗡”声,且加速踏板又开始振动,整个车身都有共振现象;当发动机转速
Fault phenomenon A 2002 Lexus ES300 car, equipped with 1MZ-FE engine, driving range of about 26.3 million km. According to the driver’s reaction, the car recently had a resonance phenomenon in the bodywork during acceleration. Many spare parts have been replaced for this reason, but the cause of the malfunction has still not been found. Fault diagnosis test to verify the failure and found that the engine idling at work, the cab has a “buzzing” sound, slowly accelerating to 1 000 r / min, “buzz ” sound increases, and the accelerator pedal can “Vamp sound” disappears when the engine speed exceeds 1 000 r / min; continue to depress the accelerator to make the engine speed reach 1 600 r / min, “buzzing ” again appears in the cab , And the accelerator pedal began to vibrate, the entire body has a resonance phenomenon; when the engine speed