Egr flow metering systems and methods
AssigneeFca US LLC
InventorsGang Chen, Hussein Dourra, Gregory T Weber, Drushan A Mavalankar
Life of this patent
Estimating the term…
Abstract
Methods and systems for metering at least one EGR valve to a position determined to pass a desired EGR flow for a given set of engine characteristics. The methods include determining the EGR valve position based on pipe flow characteristics, or determining the EGR valve position based on pipe flow characteristics when differential pressure across the EGR valve is less than a pressure threshold.
Claims25
A method of setting at least one exhaust gas recirculation (EGR) valve position for mixing EGR with intake air in an engine system comprising an engine, an EGR system including EGR piping, and at least one EGR valve and an air intake system including air intake piping, the method comprising:
- determining by a controller operating characteristics of the engine system;
- determining by the controller a desired EGR flow ratio based on the operating characteristics of the engine system;
- determining by the controller at least one EGR flow loss factor corresponding to the desired EGR flow ratio based on a relationship between the desired EGR flow and a pipe flow characteristic ratio;
- determining by the controller an EGR valve position using the at least one EGR flow loss factor;
- and
- configuring by the controller the EGR valve position to the determined EGR valve position,
- wherein the desired EGR flow ratio comprises the relationship of a flow rate of air to a flow rate of EGR,
- and the pipe flow characteristic ratio comprises a ratio of an EGR system characteristic to an air intake system characteristic.
A method of setting at least one exhaust gas recirculation (EGR) valve position for mixing EGR with intake air in an engine system, the method comprising:
- Determining an EGR valve position based on pipe flow characteristics
An engine system comprising:
- an engine;
- an EGR system including EGR piping and at least one EGR valve;
- an air intake system including air intake piping;
- a plurality of sensors for sensing characteristics of the engine system;
- and
- an EGR control unit comprising a processor connected to receive the sensed characteristics of the engine system,
- wherein the processor is configured to:
- determine operating characteristics of the engine system;
- determine a desired EGR flow ratio based on the engine system characteristics;
- determine at least one EGR flow loss factor corresponding to the desired EGR flow ratio based on a relationship between the desired EGR flow ratio and a pipe flow characteristic ratio;
- determine at least one EGR valve position using the at least one EGR flow loss factor;
- and
- configure the at least one EGR valve position to the determined EGR valve position,
- wherein the desired EGR flow ratio comprises the relationship of a flow rate of air to a flow rate of EGR,
- and the pipe flow characteristic ratio comprises a ratio of an EGR system characteristic to an air intake system characteristic.
Dependencies are inferred from the claim text.