Variable valve device for engine

Details Variable valve device for engine Variable valve device for engine

2011-05-10

2011-05-10

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Engine speed regulator

By changing valve lift

C123S090150

Reexamination Certificate

active

07938100

ABSTRACT:
A variable valve device, which is capable of controlling a fuel injection amount or the like if a control shaft sensor has a failure, uses a brushless DC motor to rotate the control shaft, detects the rotation angle of the motor using its magnetic pole sensors, and calculates an estimated rotation angle of the control shaft based on the rotation angle. The variable valve device further determines that the control shaft sensor has a failure if the difference between the actual rotation angle of the control shaft detected by the control shaft sensor and the calculated estimated rotation angle exceeds a prescribed value and controls the fuel injection amount, fuel injection timing and ignition timing of the engine based on the calculated estimated rotation angle.

REFERENCES:
patent: 7293537 (2007-11-01), Arai et al.
patent: 1 669 560 (2006-06-01), None
patent: 1 741 909 (2007-01-01), None
patent: 2003-041976 (2003-02-01), None
patent: 2004-48875 (2004-02-01), None
patent: 2007-37336 (2007-02-01), None
Official Communication issued in corresponding European Patent Application No. 09000453.2, mailed on Sep. 29, 2010.

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