Control system parameter monitor

Details Control system parameter monitor Control system parameter monitor

2005-11-29

2005-11-29

Mohanty, Bibhu (Department: 3747)

Internal-combustion engines

Spark ignition timing control

Electronic control

C123S319000

Reexamination Certificate

active

06968826

ABSTRACT:
A system and method for monitoring a control system parameter determine a difference between a desired and estimated or measured parameter value, apply a weighting factor to the difference, and select a control strategy based on the weighted difference. The weighting factor generally reflects the confidence in the accuracy of the parameter value determined by the parameter monitor. The weighting factor may be determined based on one or more engine or ambient operating conditions or parameters, or based on statistical analyses of monitor values and/or control system parameter values, for example. In one embodiment, an engine torque monitor for an electronic throttle control system uses percent torque deviation and rate of change to select an appropriate weighting factor and determine whether a deviation between desired and estimated or measured torque selects an alternative control strategy.

REFERENCES:
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patent: 5635634 (1997-06-01), Reuschenbach et al.
patent: 5889204 (1999-03-01), Scherer et al.
patent: 6328007 (2001-12-01), Hirasawa et al.

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