Variable valve mechanism control device and control method

Details Variable valve mechanism control device and control method Variable valve mechanism control device and control method

2007-11-13

2007-11-13

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090170, C123S090150, C123S090310

Reexamination Certificate

active

11295170

ABSTRACT:
With a variable valve timing system, engine operability may be lost when performing open control of lift characteristic amounts to the minimum or the maximum of a variable range when a sensor error occurs. The present invention provides a lift operation angle changing mechanism that can continuously change intake valve lift amount and operation angle within a prescribed variable range. A target operation angle is calculated based on the number of engine revolutions and the accelerator pedal opening APO. An error is determined for the operation angle sensor that detects the actual operation angle. A normal control amount is calculated based on the target operation angle and the actual operation angle, and a failure control amount is calculated based on the number of engine revolutions. Therefore, an intermediate value within the variable range can be obtained as the failure control amount. The normal control amount is output to actuator51under normal operation, and the failure control amount is output to actuator51when an error occurs.

REFERENCES:
patent: 6575128 (2003-06-01), Nakamura et al.
patent: 6843226 (2005-01-01), Miura
patent: 7077085 (2006-07-01), Arai et al.
patent: 7107951 (2006-09-01), Urushihata et al.

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