有时在汽车行驶时，2档上3档、4档上5档冲击、6档下5档冲击、4档降3档冲击、倒档冲击也会受到影响。汽车自动变速箱换档冲击故障是怎么回事？
Sometimes when the car is driving, the impact of gear 2 up to gear 3, gear 4 up to gear 5, gear 6 down to gear 5, gear 4 down to gear 3 and reverse gear will also be affected. What's going on with the shift shock fault of automobile automatic transmission?
去汽车服务站检查，通过诊断仪诊断，自动变速箱控制单元无故障码，动态数据流无异常。检测发动机控制系统，显示正常。用诊断仪检测所有车身电路，显示正常。在电路没有故障的情况下，只有机械和油路两个问题。选择更换阀体总成，路试后故障现象不变。
Go to the car service station for inspection. Through the diagnosis with the diagnostic instrument, the automatic transmission control unit has no fault code and the dynamic data flow is normal. Check the engine control system and the display is normal. Check all body circuits with the diagnostic instrument and the display is normal. When there is no fault in the circuit, there are only two problems: mechanical and oil circuit. Choose to replace the valve body assembly, and the fault phenomenon remains unchanged after the road test.
根据业主提供的故障，进行多方位的分析，暂时排除电路故障。分析油路和机械方面，检查自动变速箱部件工作表，分析车主提出的故障点。
According to the fault provided by the owner, conduct multi-directional analysis and temporarily eliminate the circuit fault. Analyze the oil circuit and machinery, check the working table of automatic transmission components, and analyze the fault points proposed by the owner.
从机械部件工作表可以看出，当2档升到3档时，B1制动器需要放油，K2离合器需要供油。如果B1延迟漏油，会有冲击，如果K2提前啮合，也会有冲击。
It can be seen from the mechanical parts worksheet that when the 2nd gear is raised to the 3rd gear, the B1 brake needs to be drained and the K2 clutch needs to be supplied with oil. If B1 delays oil leakage, there will be impact. If K2 engages in advance, there will also be impact.
再次分析4档升5档的影响，K1离合器需要放油，K2离合器需要供油。在这里，K2参与了第二次升档冲击。怀疑K2更可能提前工作。
Analyze the influence of 4th gear to 5th gear again. K1 clutch needs oil drainage and K2 clutch needs oil supply. Here, K2 participated in the second upshift impact. It is suspected that K2 is more likely to work in advance.
看6档降5档的影响，是B1放油，K2供油。在这里，K2再次出现。怀疑K2提前搞的可能性更大。看4档降3档的影响，就是K3放油和K2供油。
Look at the impact of downshifting from 6th gear to 5th gear. It is B1 oil drain and K2 oil supply. Here, K2 appears again. It is more likely to suspect K2 in advance. Look at the impact of downshifting from 4th gear to 3rd gear, that is, K3 oil drain and K2 oil supply.
故障目标应该锁定在K2离合器，但也需要分析K2离合器工作异常的原因是油路还是机械方面？遵循易到难的方法。
The fault target should be locked in K2 clutch, but it is also necessary to analyze whether the reason for the abnormal operation of K2 clutch is oil circuit or mechanical? Follow the easy to difficult approach.
从油路分析来看，油路由自动变速箱控制单元控制。如果自动变速箱控制单元不提前控制工作，油路将不会提前自动供油。
From the oil circuit analysis, the oil is controlled by the automatic transmission control unit. If the automatic transmission control unit does not work in advance, the oil circuit will not supply oil automatically in advance.
也就是说，汽车的油路控制只会延迟而不会提前（油路太脏，阀杆动作会延迟）。拆解自动变速箱，发现K2离合器活塞的锥形回位弹簧断裂。
In other words, the oil circuit control of the car will only be delayed rather than advanced (the oil circuit is too dirty, and the action of the valve rod will be delayed). After disassembling the automatic transmission, it was found that the conical return spring of K2 clutch piston was broken.
由于锥形回程弹片断裂，固定锥形弹片的两张卡从两侧掉落。由于K2离合器活塞放油时没有弹片帮助活塞回位，所以K2离合器摩擦片没有间隙，润滑油不能进入K2离合器摩擦片表面，干摩擦后摩擦片燃烧。
As the conical return shrapnel was broken, the two cards fixing the conical shrapnel fell from both sides. Since there is no spring plate to help the piston return when the K2 clutch piston discharges oil, the K2 clutch friction plate has no clearance, and the lubricating oil cannot enter the K2 clutch friction plate surface. After dry friction, the friction plate burns.
济南自动变速箱维修人员提醒，由于K2离合器片之间没有间隙，供油时K2离合器会立即接合；没有缓冲器，导致升档和降档时都会受到冲击，换档时也会受到冲击。故障目标确定，根据需要进行更换。完成后，重复测试，故障排除。
Jinan automatic transmission maintenance personnel remind that since there is no gap between K2 clutch plates, K2 clutch will be engaged immediately during oil supply; Without buffer, it will be impacted during upshift and downshift, as well as during shift. Determine the fault target and replace it as needed. After completion, repeat the test and troubleshoot.
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