Engine Braking

This example shows a diesel engine equipped with a Jake Brake (R) or compression release engine brake. This type of brake is activated by the driver to slow the vehicle without relying on friction braking mechanisms. Air is released from a number of cylinders at the end of their compression strokes. In this example, the driver can dynamically select to activate braking on zero to eight cylinders. The braking torque for each cylinder is set using a lookup table with engine speed as the input.

Model

Engine with Brake Subsystem

Total Braking Torque Subsystem

Simulation Results from Simscape Logging

This plot shows how the engine speed changes with the applied throttle and with the number of cylinders that are used for engine braking.

This plot shows the torque supplied by the engine varies with the applied throttle and with the number of cylinders that are used for engine braking.