Method and system for decoding of VCT/CID sensor wheel

Details Method and system for decoding of VCT/CID sensor wheel Method and system for decoding of VCT/CID sensor wheel

1997-01-16

1998-04-07

Dombroske, George M.

Measuring and testing

Test stand

For engine

701101, G01M 1500

Patent

active

057366330

ABSTRACT:
A method and system are provided for distinguishing a cylinder identification (CID) signal pulse from camshaft timing signal pulses in a variable cam timing (VCT) engine having multiple engine combustion events. The method includes generating multiple signal pulses including a signal pulse which identifies an engine cylinder and a signal pulse for each one of the multiple engine combustion events. The method also includes measuring a first time period between a first signal pulse and a second signal pulse, measuring a second time period between the second signal pulse and a third signal pulse, and determining that the third signal pulse is the cylinder identification signal pulse if a product of the second time period and a scaling factor fails to exceed the first time period. A specially designed VCT/CID signal generator, and an appropriately programmed microprocessor are provided for performing the method.

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