EXHAUST GAS RECIRCULATION DIAGNOSTIC FOR COORDINATED TORQUE CONTROL SYSTEMS
First Claim
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1. A control system, comprising:
- a throttle control module that selectively maintains a desired throttle area when a vehicle is in a coastdown mode;
an exhaust gas recirculation (EGR) control module that opens an EGR valve when the desired throttle area is maintained; and
a diagnostic control module that selectively diagnoses an error of an EGR system based on a pressure increase measured in an intake manifold of the vehicle when the EGR valve is open.
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Abstract
A control system includes a throttle control module, an exhaust gas recirculation (EGR) control module, and a diagnostic control module. The throttle control module selectively maintains a desired throttle area when a vehicle is in a coastdown mode. The EGR control module opens an EGR valve when the desired throttle area is maintained. The diagnostic control module selectively diagnoses an error of an EGR system based on a pressure increase measured in an intake manifold of the vehicle when the EGR valve is open.
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Citations
20 Claims
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1. A control system, comprising:
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a throttle control module that selectively maintains a desired throttle area when a vehicle is in a coastdown mode; an exhaust gas recirculation (EGR) control module that opens an EGR valve when the desired throttle area is maintained; and a diagnostic control module that selectively diagnoses an error of an EGR system based on a pressure increase measured in an intake manifold of the vehicle when the EGR valve is open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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selectively maintaining a desired throttle area when a vehicle is in a coastdown mode; opening an EGR valve when the desired throttle area is maintained; and selectively diagnosing an error of an EGR system based on a pressure increase measured in an intake manifold of the vehicle when the EGR valve is open. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification