一辆现代索那塔乘用车,采用KM175型液力控制自动变速器,在一次换完ATF(自动变速器油)后驾驶员反映,每当车速提高到约40km/h时,乘用车都会有一次严重的振动,但过了振动点后,一切又会恢复正常。首先进行道路试验,发现当车速在提高到25km/h时,自动变速器进行第一次换档(由第1档升入第2档),换档的冲击程度 A modern Sonata passenger car, using KM175 hydraulic control automatic transmission, after a change of ATF (automatic transmission oil) driver reflects, whenever the speed increased to about 40km / h, the passenger car will have A serious vibration, but after the vibration point, everything will return to normal. The first road test, found that when the speed is increased to 25km / h, the automatic transmission for the first shift (from the first gear into the second gear), shift the degree of impact