Correction of systematic position-sensing errors in internal com

Details Correction of systematic position-sensing errors in internal com Correction of systematic position-sensing errors in internal com

1990-10-01

1992-06-02

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

051176815

ABSTRACT:
Systematic errors in manufacturing of position markers of an internal combustion engine position sensing system are corrected by a procedure which detects nonuniformities in the placement of the position markers using an engine coastdown without combustion in the cylinders. Since the coastdown comprises a smooth deceleration, any nonuniformities detected in the velocities calculated for individual firing intervals during the coastdown are a manifestation of nonuniformities in the position marker placement. These nonuniformities are used to calculate correction factors which are stored for use when calculating velocities during engine combustion.

REFERENCES:
patent: 4000403 (1977-02-01), Olsen et al.
patent: 4459968 (1984-07-01), Brandt et al.
SAE Paper 870386, James et al, "Microprocessor Based Data Acquisition for Analysis of Engine Performance".

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