Default methodology for recovering from loss of high resolution engine position signal
AssigneeDelphi Technologies, Inc.
InventorsSalem Ahmad Fayyad, Peter Hull Maehling, Charles O. James, Jr., Kenneth M. Simpson
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Abstract
A default engine control method for an internal combustion engine recovers from the loss of a high-resolution engine position signal by calculating a high resolution pulse period based on a recognized pattern of a low resolution engine position signal. Interrupts for signaling the execution of cycle-related control algorithms are scheduled in time based on the calculated pulse period, and pulse period errors due to changing engine speed are periodically corrected based on the timing of subsequent transitions in the low resolution position signal relative to the scheduled interrupts.
Claims7
A method of scheduling cycle-related control events of an internal combustion engine, comprising the steps of:
- normally scheduling said control events based on level transitions of a high resolution pulsetrain developed in response to movement of a rotary shaft of the engine;
- and
- in response to a detected loss of said high resolution pulsetrain:
- monitoring a low resolution signal having an engine cycle-related pattern;
- identifying said engine cycle-related pattern;
- calculating a pulse period of said high resolution pulsetrain based on a pulse interval of the identified pattern;
- and
- scheduling said control events in time based on the calculated pulse period.
Dependencies are inferred from the claim text.