Patent ID: 7055496

Claim:
An internal combustion engine that propels a vehicle and comprises: a fuel injection system for injecting fuel into engine cylinders at a desired injection control pressure; a fluid-operated device that uses pressure of a control fluid for activating an engine brake to increase engine back pressure; and a control system for activating and de-activating the brake and that comprises a processor that processes data to develop desired injection control pressure data for controlling injection control pressure, that during activation of the brake develops desired injection control pressure data from a main ICP-determining strategy, and that upon the control system requesting de-activation of the brake develops desired injection control pressure data from a transitional ICP-determining strategy instead of the main ICP-determining strategy during a transition time interval that commences in response to the de-activation request and continues while pressure of the control fluid acting on the device is being relieved to allow resumption of positive power flow from the engine to propel the vehicle and that ends after the processor has determined the existence of a predetermined correlation between transitional injection control pressure data from the transitional ICP-deterrnining strategy that is being used as desired injection control pressure data and data indicating pressure of the control fluid acting on the device.