What is the principle of engine exhaust braking?
1 Answers
The principle of engine exhaust braking: Utilizing the vehicle's own kinetic energy to compress air during the intake stroke, an additional mechanism opens the exhaust valve when the piston reaches the top dead center, expelling the compressed high-temperature and high-pressure gas from the cylinder. This prevents the compressed air from performing work on the piston during the next power stroke. Exhaust braking is widely used in large diesel vehicles. A regulating valve is installed on the engine exhaust pipe, and closing this valve increases the pressure during the exhaust stroke, generating braking force through the resulting negative pressure. The regulating valve is typically driven by a control mechanism and often shares the same power source as the main brake system.