Valve control device reducing noise

Details Valve control device reducing noise Valve control device reducing noise

2007-04-03

2007-04-03

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

C123S399000

Reexamination Certificate

active

11330118

ABSTRACT:
A valve control device corrects a change rate of an opening degree of a valve in accordance with engine rotation speed when deposit elimination operation is performed. The valve control device corrects an inclination between a positive maximum opening degree and a negative maximum opening degree of the valve in accordance with the engine rotation speed when the deposit elimination operation is performed. Thus, when the engine rotation speed is low and a noise accompanying the deposit elimination operation becomes more audible, the change rate of the opening degree of the valve is reduced. As a result, the noise accompanying the deposit elimination operation is reduced and annoyance for vehicle occupants is reduced.

REFERENCES:
patent: 5660152 (1997-08-01), Masuda
patent: 2005/0066938 (2005-03-01), Iannone et al.
patent: 2000-320347 (2000-11-01), None
patent: 2001-173464 (2001-06-01), None
patent: 2003-314377 (2003-11-01), None

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