Rate limiting and balancing control system for dual...

Details Rate limiting and balancing control system for dual... Rate limiting and balancing control system for dual...

2007-03-20

2008-12-23

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C464S160000

Reexamination Certificate

active

07467611

ABSTRACT:
A method for controlling dual independent camshaft phasers in an internal combustion engine. The method has three basic steps: a) first, determining if rate balancing between the two phasers is required; b) second, determining the optimal rate balancing commands; and c) third, applying the determined rate balancing commands to the appropriate phaser(s). In determining the rate balancing commands, there are three possible phaser options: the intake phaser requires priority; the exhaust phaser requires priority; or neither phaser requires priority. Lookup tables are stored in the engine controller for each option. When either phaser has priority, the other phaser is actuated after a delay based upon the position error of the priority phaser, generally at a lower phase rate. When neither phaser has priority, both phasers are actuated at a rate consistent with oil-delivery capabilities of the engine.

REFERENCES:
patent: 6488008 (2002-12-01), Jankovic et al.
patent: 6758179 (2004-07-01), McKay et al.
patent: 6877466 (2005-04-01), Shindou et al.

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