Engine cycle timing and synchronization based on crankshaft angl

Measuring and testing – Vehicle chassis – Steering

Patent

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Details

36443103, 73116, F02D 4106, G01M 1500

Patent

active

056043040

ABSTRACT:
A memory stores and holds both the number of crankshaft angle pulse signals occurring after detecting a reference portion when an engine stops and data relating to whether the reference portion which is supposed to be next detected upon re-start of the engine is a reference position of the camshaft. When the engine is re-started, it is determined whether a reverse rotation of the crankshaft across the reference position happened by comparing a predetermined value with the total obtained by adding the number of pulse signals stored in the memory and the number of pulse signals occurring until the reference portion is first detected again. When such reverse rotation happened, the reference position of the camshaft is shifted by 360.degree. CA. Therefore, regardless of whether such reverse rotation across the reference position happened or not, the engine timing cycle is again precisely synchronized.

REFERENCES:
patent: 5079945 (1992-01-01), Hansen et al.
patent: 5165271 (1992-11-01), Stepper et al.
patent: 5353635 (1994-10-01), Saiki et al.
patent: 5548995 (1996-08-01), Clinton et al.

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