Patent ID: 6216668
Filing Date: 2001-04-17
Classification: F02D,G01M

Abstract:
A method of measuring performance of an internal combustion engine having a pluality of cylinders, a plurality of fuel injectors, each associated with a corresponding cylinder, at least one compression brake unit operatively associated with at least one of the cylinders, an engine speed sensor and an engine control unit (ECU) for controlling the fuel injectors and the compression brake unit as a function of at least sensed engine speed, the method comprising the following steps:a) running the engine at a specified speed under no load;b) reducing to zero a rate of fuel flow delivered by a selected one of the fuel injectors associated with one of the cylinders associated with the compression brake unit;c) increasing by a first amount a rate of fuel flow delivered by the other of the fuel injectors so that the engine runs at said specified engine speed;d) activating the compression brake unit associated with said selected fuel injector so that the cylinder associated therewith absorbs power; ande) increasing by a second amount a rate of fuel flow delivered by the other of the fuel injectors so that the engine runs at said specified engine speed, said second amount increase representing a performance characteristic of the engine.