Control system for exhaust gas recirculation system
AssigneeCaterpillar Inc.
InventorsJames J. Faletti, Alois Amstutz
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Abstract
A system and method for controlling an exhaust gas recirculation system (10) on an electronically controlled, turbocharger (18) equipped internal combustion engine (12) having two or more actuating devices (84,86). In the disclosed embodiments, the actuating devices (84,86) may include an exhaust gas recirculation valve (40), a turbocharger back pressure valve (44), the vane actuators (46) in a variable geometry turbocharger (48), or an air intake throttle valve.
Claims17
A control system (81) for an exhaust gas recirculation system (10) having two or more actuating devices, said control system (81) comprising:
- an engine controller (80) adapted for receiving two or more engine operating parameter inputs (88,90) and providing two or more actuator control output signals (108,132);
- a first actuator (84) coupled to said engine controller (80) and having an input for receiving a first actuator control output signal (108) from said engine controller (80), said first actuator (84) further connected to a first actuating device of said exhaust gas recirculation system (10) and adapted for controlling said first actuating device in response to said first actuator control output signal (108);
- a second actuator (86) coupled to said engine controller (80) and having an input for receiving a second actuator control output signal (132) from said engine controller (80), said second actuator (86) further connected to a second actuating device of said exhaust gas recirculation system (10) and adapted for controlling said second actuating device in response to said second actuator control output signal (132);
- and
- wherein said engine controller (80) is adapted to generate said second actuator control output signal (132) based on said engine operating parameter inputs (88,90) and said control signals associated with said first actuator (84).
A method of controlling an exhaust gas recirculation system (10) in a turbocharged engine (12) having two or more cooperatively controlled actuating devices, said method comprising the steps of:
- receiving two or more engine operating parameter inputs (88,90)
- producing a first actuator command signal in response to said engine operating parameter inputs;
- producing a first actuator control output signal in response to said first actuator command signal and one or more first actuator signal limits wherein said first actuator signal limits are determined based on said engine operating parameter inputs;
- controlling a first actuator in response to said first actuator control output signal;
- producing a second actuator control output signal in response to said first actuator control signal and said engine operating parameter inputs;
- and
- controlling a second actuator in response to said second actuator control output signal.
Dependencies are inferred from the claim text.