ADAPTIVE EGR CONTROL FOR INTERNAL COMBUSTION ENGINES
First Claim
Patent Images
1. A method for controlling an internal combustion engine having an EGR valve, the method comprising:
- determining a base valve position to deliver a target EGR flow for current operating conditions using a stored map; and
adjusting the base valve position in response to differential pressure across an orifice in the EGR flow to move the valve to a position different from the base position to provide the target flow.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for controlling an internal combustion engine having an EGR valve determine a base valve position to deliver a target flow using a stored map and adjust the base position in response to differential pressure across an orifice in the EGR flow to move the valve to a position different from the base position to provide the target flow.
-
Citations
20 Claims
-
1. A method for controlling an internal combustion engine having an EGR valve, the method comprising:
-
determining a base valve position to deliver a target EGR flow for current operating conditions using a stored map; and adjusting the base valve position in response to differential pressure across an orifice in the EGR flow to move the valve to a position different from the base position to provide the target flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. The method 6 further comprising:
generating a diagnostic code when the difference exceeds a corresponding threshold. - View Dependent Claims (10)
-
11. A system comprising:
-
a diesel fuel engine having an intake manifold and an exhaust manifold with an exhaust gas recirculation passage coupled therebetween; an EGR valve positioned in the exhaust gas recirculation passage; a flow restricting orifice positioned within the exhaust gas recirculation passage; an exhaust backpressure sensor positioned upstream of the EGR valve; a MAP sensor coupled to the intake manifold; and a controller in communication with the EGR valve, the exhaust backpressure sensor and the MAP sensor, the controller determining a base valve position to deliver a target EGR mass flow for current operating conditions using a stored map, and adjusting the base valve position in response to differential pressure across the orifice to move the EGR valve to a position different from the base valve position to provide the target flow. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A computer readable storage medium having stored data representing instructions executable by an engine controller to control EGR flow in an internal combustion engine, the computer readable storage medium comprising:
-
instructions that determine a base EGR valve position to deliver a target EGR flow based on current operating conditions using a stored map; and instructions that adjust the base valve position in response to differential pressure across an orifice in the EGR flow to move the valve to a position different from the base position to provide the target EGR flow. - View Dependent Claims (19, 20)
-
Specification