Closed loop diesel engine EGR control including event monitoring
First Claim
1. A control system for a valve that controls exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which the valve is open, the control system comprising:
- a processor that is configured for processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal.
16 Assignments
0 Petitions
Accused Products
Abstract
A control system and method for an EGR valve, particularly in a diesel engine. A processor processes data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open. The processing includes processing data corresponding to actual position of the valve and data representing a desired position of the valve to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal. Emission control system event monitors flag potential error sources in their incipiency to afford opportunity for correction before mandatory logging occurs.
-
Citations
35 Claims
-
1. A control system for a valve that controls exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which the valve is open, the control system comprising:
a processor that is configured for processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
14. A method for control of exhaust gas recirculation in an internal combustion engine by selectively positioning a valve element that establishes the extent to which an exhaust gas recirculation valve is open, the method comprising:
processing data in feedback control of the position of the valve element to develop from the data a position control signal for setting the extent to which the valve is open, including processing data corresponding to actual position of the valve element and data representing a desired position of the valve element to develop a position error signal, processing data that defines actual EGR rate and data representing a desired EGR rate to develop a rate error signal, and processing the position error signal and the rate error signal to develop the position control signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
24. An event monitoring system in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the event monitoring system comprising:
a valve monitor for monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and for logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold. - View Dependent Claims (25)
-
26. A method of event monitoring in an exhaust gas recirculation system of an internal combustion engine comprising an exhaust gas recirculation valve through which exhaust gas is recirculated and which comprises a valve element that is selectively positioned by a position error signal in a feedback loop of a closed loop control to establish the extent to which the valve is open, the method comprising:
monitoring the time for which the magnitude of the position error signal exceeds a position error threshold and logging the occurrence of an event when the time for which the magnitude of the position error signal exceeds the position error threshold exceeds a time threshold. - View Dependent Claims (27)
-
28. An event monitoring system in an exhaust gas recirculation control system of an internal combustion engine, the event monitoring system comprising:
-
a first monitor for monitoring the time for which the magnitude of a signal used in the control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and
a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold. - View Dependent Claims (29, 30, 31)
-
-
32. An event monitoring system in an internal combustion engine emission control system, the event monitoring system comprising:
-
a first monitor for monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and for logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and
a second monitor for monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold. - View Dependent Claims (33, 34)
-
-
35. An event monitoring method in an internal combustion engine emission control system, the method comprising:
-
monitoring the time for which the magnitude of a signal used in the emission control system exceeds a first threshold and logging the occurrence of a first event when the time for which the magnitude of the signal exceeds the first threshold exceeds a first time threshold; and
monitoring the time for which the magnitude of the signal exceeds a second threshold and for logging the occurrence of a second event when the time for which the magnitude of the signal exceeds the second threshold exceeds a second time threshold.
-
Specification