Who invented the automatic transmission of cars?

The automatic transmission of automobiles was invented by General Motors.

1939, General Motors of the United States first installed a hydraulic transmission device consisting of a hydraulic coupler and planetary gears on its Oldsmobile car. In the late 1940s and early 1950s, the hydraulic shift automatic transmission began to appear, and the shift was automatically controlled according to the vehicle speed and throttle opening, which made the automatic transmission enter a period of rapid development. The electronic control system of automatic transmission began in the mid-1960s.

Extended data

Generally speaking, the gears of automatic transmission are divided into P, R, N, D and so on.

1, p (parking gear): used when the car is parked or stopped. Note that when using this gear, the car must remain stationary, otherwise it will damage the gearbox.

2.l (low gear): also known as climbing gear, its function is to limit the range of automatic gear shifting, enhance torque and output more power.

3.n (neutral): The function is the same as manual neutral, so it is suspended.

4.OD (super gear): Also called high gear, it can output power beyond the normal transmission at high speed to save fuel.

5.r (reverse gear): Its function is the same as manual gear.

6.d (forward gear): used when driving on general roads, it can automatically switch to the appropriate working state according to road conditions and vehicle speed. A general automatic transmission includes four gears.

7.m (manual shift): You can shift to manual shift after shifting into this shift, so that a car with automatic shift can be changed to a car with manual shift.

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