What is the function of the P gear in an automatic transmission?

[SanHector]

P gear is used for parking, primarily utilizing a mechanical device to lock the rotating parts of the car, preventing it from moving. Below is an introduction to automatic transmissions: 1. Automatic principle: The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, automatic transmissions consume 10% more fuel than manual transmissions. Whether manual or automatic, the more gears there are, the more fuel-efficient the vehicle. 2. Driving tips: For manual transmission cars, higher RPMs should be used when shifting gears. Engines are designed to operate at higher RPMs, with parameters such as dynamic balance and rotational inertia of various components designed based on high RPMs. If the engine operates for extended periods under non-optimal conditions, the load and wear on internal components naturally increase, leading to frequent shaking and knocking, and affecting lifespan. Choosing 3000 RPM as the shift point ensures that after shifting, the engine operates at around 2300 RPM, keeping it within a healthy RPM range.