Throttle valve control device for internal combustion engines

Details Throttle valve control device for internal combustion engines Throttle valve control device for internal combustion engines

1996-12-19

1998-03-03

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Specific throttle valve structure

F02D 908

Patent

active

057223661

ABSTRACT:
Disclosed is a throttle valve control device for internal combustion engines which has good measuring accuracy and improved controllability of an air flow rate. A throttle valve is rotatably attached to a throttle body through a throttle shaft. The throttle body has an inner surface of straight bore type that the center of rotation of the throttle valve is positioned on a line connecting the centers of an upstream opening and a downstream opening of the throttle body. The throttle body has a spherical inner surface X2 in an idle speed control area .theta.2 near the fully closed angle of the throttle valve. The throttle body also has, in an area .theta. subsequent to the spherical inner surface X2, an inner surface X3 having a composite form made up of a spherical surface and a cylindrical surface substantially parallel to a flow of intake air.

REFERENCES:
patent: 5315975 (1994-05-01), Hattori et al.
patent: 5374031 (1994-12-01), Semence et al.
patent: 5431141 (1995-07-01), Kanazawa et al.
patent: 5465696 (1995-11-01), Gmelin

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