Method for effectively diagnosing the operational state of a...

Details Method for effectively diagnosing the operational state of a... Method for effectively diagnosing the operational state of a...

2006-06-20

2006-06-20

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090170, C123S346000, C701S110000

Reexamination Certificate

active

07063057

ABSTRACT:
A method for diagnosing the operational state of a variable valve lift device (VVL) is provided. The method includes providing a first signal indicative of an estimated position of the VVL, the first signal having a first signal-to-noise ratio; determining that the first signal represents either a first condition indicating that the VVL is operating in one of two modes of operation, a second condition indicating that the VVL is not operating in the two modes of operation, and a third condition where the first signal is not in the first or second conditions; and adjusting a camshaft phase angle when the first signal is in the third condition so that the first signal has a second signal-to-noise ratio, wherein the second signal-to-noise ratio is greater than the first signal-to-noise ratio, whereby the operational state of the VVL is identified as one of the first and second conditions.

REFERENCES:
patent: 6502536 (2003-01-01), Lee et al.
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patent: 2005/0204805 (2005-09-01), Wukahara et al.
Lee, Byungho, et al, Engine Control Using Torque Estimation, SAE Technical Paper Series 2001-01-0995, Reprinted from Electronic Engine Controls 2001: Modeling, Controls, OBD and Neural Networks (SP-1585), Detroit, Michigan, Mar. 5-8, 2001.

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