Q
how engine brake works
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
Engine braking, also known as compression release braking, is a method of braking used particularly in motor vehicles with large diesel engines. It uses the engine to assist in slowing the vehicle down, rather than relying solely on mechanical brakes.
Here's how engine brake works:
1. Engine brake is activated when the driver takes their foot off the accelerator. This causes the vehicle's speed control valve (throttle) to close.
2. With the speed control valve closed, air is blocked from the coming into the cylinder of the engine from the intake manifold.
3. During the cylinder’s piston upward movement (compression stroke), the already trapped air is compressed but with nowhere to go since the throttle is closed.
4. When the compressed air has nowhere to go, it pushes back on the piston again. The force required to push the piston back down on the power stroke slows the engine's crankshaft, reducing the rotation speed of the vehicle's drive wheels.
5. This process of air compression creates resistance, or drag, which slows the vehicle down.
6. The ignition system doesn't ignite fuel in the cylinders during engine braking, so it's a way to convert the vehicle’s kinetic energy back into heat generated by compression.
7. Lastly, when the driver puts their foot back on the accelerator, the speed control valve reopens, air flows back into the cylinder, and the engine returns to powering the vehicle forward.
It's important to note that using engine braking isn't recommended in all driving situations, but can be beneficial in prolonging the life of mechanical braking systems, especially when hauling heavy loads or descending steep slopes. Some vehicles are equipped with a separate system known as an exhaust or Jake brake, which uses engine braking to a greater extent.
Here's how engine brake works:
1. Engine brake is activated when the driver takes their foot off the accelerator. This causes the vehicle's speed control valve (throttle) to close.
2. With the speed control valve closed, air is blocked from the coming into the cylinder of the engine from the intake manifold.
3. During the cylinder’s piston upward movement (compression stroke), the already trapped air is compressed but with nowhere to go since the throttle is closed.
4. When the compressed air has nowhere to go, it pushes back on the piston again. The force required to push the piston back down on the power stroke slows the engine's crankshaft, reducing the rotation speed of the vehicle's drive wheels.
5. This process of air compression creates resistance, or drag, which slows the vehicle down.
6. The ignition system doesn't ignite fuel in the cylinders during engine braking, so it's a way to convert the vehicle’s kinetic energy back into heat generated by compression.
7. Lastly, when the driver puts their foot back on the accelerator, the speed control valve reopens, air flows back into the cylinder, and the engine returns to powering the vehicle forward.
It's important to note that using engine braking isn't recommended in all driving situations, but can be beneficial in prolonging the life of mechanical braking systems, especially when hauling heavy loads or descending steep slopes. Some vehicles are equipped with a separate system known as an exhaust or Jake brake, which uses engine braking to a greater extent.
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