故障现象一辆北汽福田欧曼336大货车(装配潍柴WP10发动机),因大负荷时经常出现发动机限速1 500 r/min,加速不畅的现象而前来维修。故障诊断用故障检测仪测试,调得的故障内容有:主、副制动开关故障;巡行系统故障;泄压阀打开故障。原地加速试车,大油门时,发动机提速不畅,发动机抖动,但 Fault phenomenon A Beiqi Futian Auman 336 large trucks (assembly Weichai WP10 engine), due to heavy load often appear engine speed limit 1 500 r / min, poor acceleration of the phenomenon and come to repair. Fault diagnosis with the fault detector test, tune the fault content: the main brake brake switch; patrol system failure; relief valve open fault. Accelerate the test in place, the big throttle, the engine slow speed, the engine jitter, but