Variable valve timing controller for internal combustion engine

Details Variable valve timing controller for internal combustion engine Variable valve timing controller for internal combustion engine

2007-08-29

2008-08-12

Vo, Hieu T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S090170

Reexamination Certificate

active

07412323

ABSTRACT:
A motor current is estimated based on a target motor speed, an actual motor speed, and an engine speed. When the estimated motor current exceeds a predetermined value equivalent to a heat limiting current value, a variation (motor speed F/B amount) of the target motor speed outputted to an EDU from an ECU is restricted so that the motor current was restricted and heat generation in motor is restricted. In consideration of a deterioration of responsivity of the variable valve timing control due to restriction of the motor current during execution of motor current restriction processing, an existence of the abnormalities of variable valve timing controller is determined based on a deviation of the target camshaft phase and the actual camshaft phase.

REFERENCES:
patent: 6953013 (2005-10-01), Tani
patent: 7243627 (2007-07-01), Izumi et al.
patent: 7308877 (2007-12-01), Izumi et al.
patent: 2006/0042579 (2006-03-01), Izumi et al.
patent: 2007-239593 (2007-09-01), None

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