In-chassis engine compression release brake diagnostic test...

Details In-chassis engine compression release brake diagnostic test... In-chassis engine compression release brake diagnostic test...

2005-05-17

2005-05-17

McCall, Eric S. (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Compression

C073S117020

Reexamination Certificate

active

06892569

ABSTRACT:
It is becoming more common for diesel engine cylinders to include an engine compression release brake that can utilize energy built up in the cylinder to provide additional braking for the vehicle. The present invention utilizes a software diagnostic test that is stored in an electronic control module to detect defects in the engine compression release brakes. In particular, the present invention operates a first portion of the engine cylinders in a power mode and a second portion of the engine cylinders in a braking mode and compares a resulting fuel injector response or engine response to an expected value to determine if one or more of the engine compression release brakes are performing as expected.

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