90% of automatic owners do not know the use of this button in the car

It can be said with certainty that the vast majority of owners cannot fully understand all the features that they love on the body, especially some unique keys. Some functions are because they are rarely used and they are not touched. Over time, they become directly ignored. And some of them are because the owners did not understand their purpose from beginning to end, so naturally they have not been used. The "O/D" button is one of them. It is one of the standard on the automatic car. It is actually very easy to use.

The English name of the "O/D" key is Over-Drive, which means overdrive. For example, the 4th gear ratio of a 4th gearbox has a gear ratio of 0.685, which means that the ratio is less than 1, which means that the engine crankshaft turns slower than the gearbox, which is the overdrive gear. Its role is to save fuel on the highway.

When the O/D button is pressed, the indicator of the “O/D OFF” indicator lights up, and the 4AT model car can only switch between 1st gear, 2nd gear and 3rd gear, and cannot be cut to 4th gear. When is the "O/D key" used?

1. When driving at high speed requires overtaking.

Many cars now have an automatic downshift function for high-speed overtaking, but compared to cars without this feature, 4 when the AT model speed reaches 80km/h, it is in an overdrive state. If you want to overtake quickly, press the “O/D button” and then drop to 3th gear, then the torque will increase and the throttle will quickly overtake. And it's very smooth.

2. When the city runs at a low speed.

When too much traffic is not suitable for driving fast cars, pressing the “O/D button” will limit the number of gears to within 3 gears, which can reduce unnecessary switching of the solenoid valve when shifting. This lower speed is also smoother and consumes less fuel.

3. Downhill control speed, reduce the brakes.

Press the “O/D button” on the downhill to use the engine state at low gear to assist the brake and reduce the brake.


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