Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Patent
1998-06-12
1999-12-28
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
123403, F02D 908
Patent
active
060067225
ABSTRACT:
An air control valve for an engine includes a throttle body defining an air intake passage and a throttle valve rotatably mounted in the passage. The range of valve rotation includes an idle control portion extending from a minimum air flow position to an intermediate air flow position and a power control portion extending from the intermediate air flow position to a maximum air flow position. The intake passage is defined by an internal wall of the throttle body having a pair of arcuate surfaces spaced from the valve periphery, at a maximum first radius from the valve axis, with gradually increasing clearance on opposite sides of the valve axis in the idle control range from the minimum to the intermediate air flow position of the valve. The arcuate surfaces are defined by second and third radii greater than the maximum first radius and centered on second and third axes spaced laterally of the passage a predetermined offset distance beyond the valve axis relative to their respective surfaces. The offset dimensions are chosen to provide fine air flow resolution (gradually increasing air flow) during opening of the throttle valve in the idle control portion of its range with much greater air flow change in the power control portion. The arrangement allows control of the throttle valve with an electronic throttle control actuator with a limited number of control positions.
REFERENCES:
patent: 4391247 (1983-07-01), Shioyama et al.
patent: 5315975 (1994-05-01), Hattori et al.
patent: 5374031 (1994-12-01), Semerce et al.
patent: 5465696 (1995-11-01), Gmelin
patent: 5492097 (1996-02-01), Byram et al.
patent: 5722366 (1998-03-01), Adachi et al.
Cichosz Vincent A.
General Motors Corporation
Vo Hieu T.
Wolfe Willis R.
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