Closed-loop camshaft phaser control

Details Closed-loop camshaft phaser control Closed-loop camshaft phaser control

1998-03-13

1999-08-17

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 134

Patent

active

059378069

ABSTRACT:
Internal combustion engine variable valve timing control with a camshaft phaser for varying rotational phase between a camshaft and a crankshaft in response to a control command determined through a hybrid control strategy without resort to direct temperature measurement. For a range of phase errors requiring high response compensation, a control strategy emphasizing rapid response, such as a bang-bang strategy, is deployed. For a range of phase errors requiring high accuracy compensation, a control strategy emphasizing high precision, such as a proportional-plus-integral strategy, is deployed. The phase error ranges are updated periodically to account for changes in operating conditions. The control command includes an offset which varies in response to a periodically estimated control deadband to affirmatively account for the deadband with each issued control command.

REFERENCES:
patent: 5333577 (1994-08-01), Shinojima
patent: 5363817 (1994-11-01), Ikeda et al.
patent: 5417187 (1995-05-01), Meyer et al.
patent: 5522352 (1996-06-01), Adachi et al.
patent: 5570621 (1996-11-01), Kabasin
patent: 5623896 (1997-04-01), Kato et al.

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