Method to estimate variable valve performance degradation

Details Method to estimate variable valve performance degradation Method to estimate variable valve performance degradation

2007-02-06

2007-02-06

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090220, C123S090230, C701S105000, C060S285000

Reexamination Certificate

active

11050340

ABSTRACT:
A system comprising of an engine having a first group of cylinders and a second group of cylinders, a first variable valve system in said first group, a second variable valve system in said second group, and a controller for determining degradation of operation of at least one of said first and second variable valve systems, said controller determining said degradation in response to controller errors of said valves and differences between operation of said first and second valve systems.

REFERENCES:
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patent: 6257184 (2001-07-01), Yamagishi et al.
patent: 6758179 (2004-07-01), McKay et al.
patent: 6877466 (2005-04-01), Shindou et al.
patent: 6883476 (2005-04-01), Nohara et al.
patent: 1363007 (2003-11-01), None

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