Valve control method
First Claim
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1. A valve position control method for controlling a closed valve position of a valve, the method comprising the steps of:
- selecting a desired valve position within a range of valve closed positions; and
adjusting an actuation force applied to the valve in response to a feedback variable to maintain the desired closed position within the range of valve closed position, the adjusting step comprising the steps of;
reading the feedback variable;
creating an error signal by subtracting the feedback variable from the desired valve position; and
generating an actuation signal as a function of the error signal to maintain the desired valve position.
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Abstract
A valve control method for controlling a closed valve position of an exhaust gas recirculation valve for an internal combustion engine includes a feedback correction loop generating a feedback variable by comparing the output of a valve position sensor to a desired closed valve position. The feedback variable is used to control an actuator coupled to the valve which cooperates with a compliant seat. Thus, the desired closed position is maintained in a ready to open state, reducing valve opening delay caused by biasing forces.
27 Citations
14 Claims
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1. A valve position control method for controlling a closed valve position of a valve, the method comprising the steps of:
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selecting a desired valve position within a range of valve closed positions; and adjusting an actuation force applied to the valve in response to a feedback variable to maintain the desired closed position within the range of valve closed position, the adjusting step comprising the steps of; reading the feedback variable; creating an error signal by subtracting the feedback variable from the desired valve position; and
generating an actuation signal as a function of the error signal to maintain the desired valve position. - View Dependent Claims (2, 3)
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4. A valve position control method for controlling a closed valve position of a valve, the method comprising the steps of:
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selecting a desired valve position within a range of valve closed positions; reading a feedback variable; creating an error signal by subtracting the feedback variable from the desired valve position; generating an actuation signal as a function of the error signal to maintain the desired valve position. - View Dependent Claims (5, 6, 7)
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8. A valve system for controlling a valve preload force comprising:
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a valve comprising; a compliant member forming a compliant seat; a valve pintle cooperating with the compliant seat; a feedback sensor for inferring pintle position; an actuator coupled to the valve pintle; and a controller for selecting a desired pintle position within a range of valve closed positions, and adjusting an actuation force applied to the valve in response to the inferred pintle position to maintain the desired closed position within the range of valve closed position. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification