The driver releases the accelerator pedal and keeps the clutch engaged. The forward kinetic energy of the truck reacts to the drive system and the engine to keep it running. The piston continues to reciprocate. The four strokes of intake, compression, expansion, and exhaust continue to circulate.
At this time, once the engine exhaust valve braking (EVB) is started, the engine exhaust valve will be opened by the high exhaust back pressure, and the compressed high-pressure air will be discharged through the exhaust system, thereby reducing the high pressure air in the expansion stroke. The work done by the piston makes the engine change from a device that outputs power to a device that consumes power (like an air compressor), which consumes the kinetic energy of the entire vehicle to achieve the purpose of controlling or reducing the speed of the vehicle.
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