Electronic exhaust gas recirculation valve control
First Claim
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1. A position control system for an EGR valve that includes a solenoid actuator, the position control system comprising:
- a desired EGR valve position module that calculates a desired EGR valve position;
an actual EGR valve position module that communicates with the EGR valve and calculates an actual EGR valve position;
an EGR valve pressure change module that determines a pressure change across the EGR valve;
a first lookup table that communicates with the EGR valve position module and determines a first duty cycle control term indicative of the desired EGR valve position;
a second lookup table that communicates with the EGR valve pressure change module and determines a second duty cycle control term indicative of the pressure change; and
a control module that communicates with the desired EGR valve position module, the actual EGR valve position module, and the first and second lookup tables, wherein the control module generates an error signal based on the desired EGR valve position and the actual EGR valve position, calculates at least one third duty cycle control term based on the error signal, and controls a duty cycle of the solenoid actuator according to the first, second, and third duty cycle control terms.
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Abstract
An EGR valve position control method controls a position of an EGR valve according to a pressure change across the valve and a desired EGR valve position. The method calculates a desired EGR valve position and generates one or more duty cycle control terms based on a difference between the desired EGR valve position and an actual EGR valve position. Additionally, the method provides feedforward control based on the pressure change and the desired EGR valve position in order to generate feedforward duty cycle control terms. The method controls the position of the EGR valve based on the duty cycle control terms.
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Citations
12 Claims
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1. A position control system for an EGR valve that includes a solenoid actuator, the position control system comprising:
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a desired EGR valve position module that calculates a desired EGR valve position; an actual EGR valve position module that communicates with the EGR valve and calculates an actual EGR valve position; an EGR valve pressure change module that determines a pressure change across the EGR valve; a first lookup table that communicates with the EGR valve position module and determines a first duty cycle control term indicative of the desired EGR valve position; a second lookup table that communicates with the EGR valve pressure change module and determines a second duty cycle control term indicative of the pressure change; and a control module that communicates with the desired EGR valve position module, the actual EGR valve position module, and the first and second lookup tables, wherein the control module generates an error signal based on the desired EGR valve position and the actual EGR valve position, calculates at least one third duty cycle control term based on the error signal, and controls a duty cycle of the solenoid actuator according to the first, second, and third duty cycle control terms. - View Dependent Claims (2, 3, 4)
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5. An position control method for an EGR valve, the method comprising:
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calculating a desired EGR valve position; calculating an EGR valve position error according to the desired EGR valve position and an actual EGR valve position; calculating at least one duty cycle control term based on the EGR valve position error; calculating at least one duty cycle feedforward term; calculating an output duty cycle based on the at least one duty cycle feedforward term and the at least one duty cycle control term; and controlling a duty cycle of a solenoid actuator based on the output duty cycle. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification