What does engine braking deceleration mean?
2 Answers
It refers to effectively controlling the vehicle speed by utilizing the resistance generated during engine operation. The specific details are as follows: 1. Introduction: Engine braking means lifting the accelerator pedal without depressing the clutch, using the compression resistance, internal friction, and intake/exhaust resistance generated by the engine's compression stroke to create a braking effect on the drive wheels. 2. Principle: Engine braking, which is keeping the gear engaged without supplying fuel, means the engine does not provide traction to the vehicle. On the contrary, as the wheels rotate and drive the transmission system, the idling engine generates a counteracting resistance to the vehicle. The higher the gear, the less the engine's effect on the vehicle, and vice versa. It is different from clutch braking, brake braking, parking braking, etc.
Engine braking deceleration means using the engine itself to help slow the car down, unlike just relying on brake pads when only pressing the brake pedal. When I was learning to drive, my instructor demonstrated how to downshift a manual transmission car: after releasing the accelerator, shift to a lower gear, and the compression resistance of the pistons inside the engine will slow down the wheels. This is especially useful when going down long slopes, such as driving on mountain roads, as it prevents the brakes from overheating or failing. After more practice, I found it also provides better stability in rainy or snowy conditions, reducing the risk of skidding. Beginners are advised to start practicing on small slopes—it's simple, safe, and saves money and effort compared to frequently replacing brakes. Once mastered, driving overall becomes much easier, and it can also extend the lifespan of car parts. In short, it's a fundamental skill—practice a few times, and you'll naturally get the hang of it.
