Patent ID: 6454242
Filing Date: 2002-09-24
Classification: F02D,F16K

Abstract:
An air control valve for metering air to an internal combustion engine and comprising:a throttle body having an intake air passage extending therethrough; a throttle valve rotatably mounted in the passage, said throttle valve rotatable within a range between minimum and maximum air flow positions about a valve axis, said range of valve rotation including a low flow portion extending from the minimum air flow position to an intermediate air flow position, said throttle valve having a periphery movable in an arc centered on the valve axis; said air passage defined by an internal wall of the throttle body having a pair of control surfaces spaced from the throttle valve periphery with gradually increasing clearance on opposite sides of the valve axis in the low flow range from the minimum air flow position to the intermediate air flow position of the throttle valve; and at least one of said control surfaces being interrupted by a recessed portion of more rapidly increasing clearance extending from adjacent the minimum to the intermediate air flow position of the throttle valve.