Control scheme for exhaust gas circulation system
AssigneeHaldex Hydraulics Corporation
InventorLars Thomas Holm
Life of this patent
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Abstract
A control system for controlling an exhaust gas recirculation system having a control valve is provided. The control system includes at least one flow sensor sensing a flow rate of at least one of a recirculating exhaust gas, an inlet air and a combined result thereof, and generating a sensor signal indicative of the sensed flow rate. A processor in communication with the at least one flow sensor receives the sensor signal indicative of the sensed flow rate and generates a control signal based at least in part upon the received sensor signal. The control valve of the exhaust gas recirculation system is adapted to be in communication with the processor and to receive the control signal therefrom, and is adapted to actuate based at least in part upon the control signal.
Claims18
A control system for controlling an exhaust gas recirculation system having a control valve, said control system comprising:
- a processor for receiving a desired flow rate of at least one of a recirculating exhaust gas, an inlet air and a combined result thereof;
- at least one flow sensor sensing a flow rate of the fluid for which the processor receives the desired flow rate, and generating a sensor signal indicative of the sensed flow rate;
- wherein the processor is in communication with said at least one flow sensor, said processor receiving the sensor signal indicative of the sensed flow rate and generating a control signal based at least in part upon a deviation of the sensed flow rate from the desired flow rate;
- and
- wherein the control valve of the exhaust gas recirculation system is adapted to be in communication with said processor and to receive the control signal therefrom, and is adapted to adjust the proportion air versus recirculating exhaust gas based at least in part upon the control signal.
An exhaust gas recirculation system comprising:
- an inlet air supply line, a recirculating exhaust gas supply line, and an output line, air entering through the inlet air supply line and exhaust gas entering though the recirculating exhaust gas supply line mixing to create a mixture of air and exhaust gas before exiting the output line;
- a control valve actuatable to control a proportion of air versus recirculating exhaust gas in the mixture;
- a processor for receiving a desired flow rate of at least one of the air flowing through the inlet air supply line, the recirculating exhaust gas flowing through the recirculating exhaust gas supply line, and the mixture of air and exhaust gas flowing through the output line;
- at least one flow sensor sensing a flow rate of the fluid for which the processor receives the desired flow rate, said at least one flow sensor generating a sensor signal indicative of the sensed flow rate;
- wherein the processor is in communication with said at least one flow sensor and with said control valve, said processor receiving the sensor signal indicative of the sensed flow rate and generating a control signal based at least in part upon a deviation of the sensed flow rate from the desired flow rate, the control signal being communicated to said control valve;
- and
- wherein said control valve actuates in order to control a proportion of air versus recirculating exhaust gas in the mixture based at least in part upon the control signal.
A method for controlling an exhaust gas recirculation system having a control valve, said method comprising the steps of:
- establishing a desired flow rate of at least one of a recirculating exhaust gas, an inlet air and a combined result thereof;
- sensing a flow rate of the fluid for which the desired flow rate is established;
- generating a sensor signal indicative of the sensed flow rate;
- generating a control signal based at least in part upon a deviation of the sensed flow rate from the desired flow rate;
- and
- causing the control valve to adjust the proportion of air versus recirculating exhaust gas based at least in part upon the control signal.
Dependencies are inferred from the claim text.