1　故障现象　　 1997年 3月 2 0日 ,我段ＤＦ7Ｂ型 60 64号机车在洛阳北站编组场调车作业时 ,出现增压器喘振、柴油机冒黑烟。乘务员进行空载试验 ,柴油机在 4 0 0～ 10 0 0ｒ/ｍｉｎ工作正常 ,但做自负荷试验时 ,柴油机在 60 0ｒ/ｍｉｎ以上时又出现增压器喘振故障 ,且励磁电 1 fault phenomenon March 20, 1997, I paragraph DF7B type 60 64 locomotive shunting operations at the Luoyang North Station marshalling operations, there surge turbocharger, diesel black smoke. Flight attendants no-load test, the diesel engine in the 400 ~ 10 0r / min work normally, but to do self-load test, the diesel engine in more than 60r / min supercharger surge fault occurs again, and excitation of electricity