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MAN EVBec electronically controlled exhaust valve brake

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Uploaded on Mar 17, 2011

The electronically controlled EVBec is an enhanced version of the standard EVB, and enables an improved braking performance to be achieved throughout the engine speed range. To achieve this, the exhaust back pressure is controlled by means of the exhaust brake valve in the exhaust pipe. The exhaust brake valve, actuated by compressed air, closes the exhaust pipe to a greater or lesser degree, depending on the braking performance required, thus generating the required exhaust back pressure for the cylinders. The vehicle management computer (FFR) measures the current exhaust gas back pressure by means of a sensor, and regulates the pressure actuation of the adjusting cylinder by means of a proportional valve. The risk of damage to combustion components through overheating is excluded by a temperature-dependent reduction in braking performance. To prevent braking from being interrupted during a gear change, the service brake takes over the vehicle braking function at this time. Brake reblending is controlled automatically by the MAN BrakeMatic.

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