The overspelling is a gear on the car. It is controlled by the automatic transmission. The automatic shifting is usually divided into P, R, N, D, 2, 1 and other gear positions, and the overspelling switch is mounted on the shifting handle for When the D gear, the D4 block is canceled, prevents the automatic transmission frequently thrust, after the overspeed shutdown shutdown, the ultra-speed control circuit is turned on, at this time, if the shifting handle is located at the D gear, with the speed of the vehicle, automatic The transmission can rise up to 4 gear.
1. The ultra-speed switch is mounted on the shifting handle, and it is used to cancel the D4 block when the D gear is canceled to prevent frequent transmission of automatic transmission. When the overspeed shutdown is closed, the ultra-speed control circuit is turned on. At this time, if the shifting handle is located at the D gear, with the speed of the vehicle, the automatic transmission can rise up to 4 block (ie, speed). After the overspeaking shutdown is turned off, the ultra-speed control circuit is disconnected, and the "0 / DOFF" indicator on the dashboard lights (indicating the use of ultra-speed), and the automatic transmission will increase with the speed of the vehicle. The maximum can only rise to 3 gear, and cannot rise to the super speed.
2, usually take the national road, curved road section slope section, commonly used reduction speed limit, the most convenient is to press the overspeed switch, sometimes use 2 gear and even 1 gear to reduce brakes, prevent brake skin from overheating and loss of loss. Delicate (than ridiculous slope), loose the throttle, press the overtrain switch, force the highest gear, the speed will be significantly slow, to keep the safe distance or need to accelerate in the unloading of the overspeed, so you can use small brakes Reduce brake pad wear. This is more suitable for suburban sections.
Troubleshooting: In the car driving, the speed has risen to the speed of the overspeed unit, but the automatic transmission cannot be changed from the 3rd file. After the speed has reached the operating range of the overspeed, it cannot be used in advance. The transmission is increased to the overspeed file.
Analysis of ideas / possible failure causes
1) The overspeed switch or other ultra-speed electronic control components have faults.
2) The direct clutch or direct unidirectional transcendence of the ultra-speed planet exceeds the clutch card.
3) The speed brake is slippery.
4) The gear switch is faulty.
5) The hydraulic oil temperature sensor is faulty.
6) The throttle position sensor is faulty.
The above is an introduction to the "role of overspeed switch, the performance and reasons", please pay attention to this site!