Post-retard fuel limiting strategy for an engine

This invention relates generally to internal combustion engines for propelling motor vehicles, and particularly to fueling strategies for such engines. More specifically it relates to a strategy for limiting fueling after an engine retarder that had been activated to slow an engine by augmenting back-pressure on the engine has been deactivated to discontinue the augmentation of back-pressure. An engine () having a control system () that executes a control strategy () for limiting engine fueling upon deactivation of an engine retarder. Upon deactivation of the retarder, the strategy immediately shuts off fueling by setting the maximum fueling limit MFLMX to zero via setting of a latch function (). Fueling continues to be shut off so long as the difference between a desired pressure for the hydraulic fluid used to force fuel into the engine combustion chambers and actual pressure of the hydraulic fluid (ICP_ERR) equals or exceeds a value (ICP_VRE_ERR) from a map () correlated both with the speed (N) at which the engine is running and with governed engine fueling (MFGOV) appropriate for the load on the engine at the engine running speed. Once that difference ceases to equal or exceed a value from the map (), the latch function is reset, and the limit value for fueling provided by the strategy increases withtime according to a map ().