Q
how does an engine brake work diesel
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
An engine brake in a diesel engine, commonly known as a "Jake Brake" after the Jacobs Vehicle Systems' trademarked version, works by altering the engine's valve operation. Unlike gasoline engines, diesel engines lack a throttle body, so engine braking effects through vacuum resistance are minimal. Instead, when the driver activates the engine brake, the system opens the exhaust valves at the top of the compression stroke. This action releases the compressed air directly into the exhaust system before it can push back on the pistons. By venting the compressed air, the engine effectively transforms its own operation into a form of air compressor, absorbing energy from the vehicle's motion to compress the air, thereby slowing down the vehicle. This process does not create friction or heat in the brake pads or drums, which is a significant advantage for heavy-duty vehicles, especially on long descents where traditional brakes might overheat. However, it's worth noting that engine brakes can be loud, leading to restrictions or prohibitions in certain areas. Correct usage and understanding local regulations are important considerations for drivers.
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