Valve duty differentiated exhaust gas recirculation control method and exhaust gas recirculation system
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsHyun-Woo Noh, Jin-Suk Kang, Ki-Min Park
Life of this patent
Estimating the term…
Abstract
An exhaust gas recirculation (EGR) control method includes a valve duty differentiated control including: detecting, by a controller, an engine operation region, a mixer region, and an external factor region as a valve control condition for an EGR valve duty correction variable for controlling an EGR system; applying, by the controller, the EGR valve duty correction variable to an EGR valve duty, which is set by a target air amount to an intake air amount, to calculate a minimum EGR valve duty; and outputting, by the controller, the calculated minimum EGR valve duty to an EGR valve as the EGR valve duty.
Claims18
An exhaust gas recirculation (EGR) system, comprising:
- a controller for implementing a valve duty differentiated control,
- wherein the valve duty differentiated control:
- detects an operation region to which acceleration is applied, a mixer region to which a ratio of an air-fuel is applied, and an external factor region to which a cooling water temperature, an air-lean environment condition, and a gear stage are applied as a valve control condition, respectively;
- determining whether or not an EGR valve duty and the minimum EGR valve duty are applied;
- and
- calculates an EGR valve duty, which is set by a target air amount to an intake air amount, by a minimum EGR valve duty depending upon the valve control condition and applying the calculated EGR valve duty for an EGR valve when the calculated minimum EGR valve duty is greater than the EGR valve duty.
An exhaust gas recirculation gas (EGR) control method, comprising a valve duty differentiated control including:
- detecting, by a controller, an engine operation region, a mixer region, and an external factor region as a valve control condition for an EGR valve duty correction variable for controlling an EGR system;
- applying, by the controller, the EGR valve duty correction variable to an EGR valve duty, which is set by a target air amount to an intake air amount, to calculate a minimum EGR valve duty in EGR valve duty cycle during engine operation;
- and
- outputting the calculated minimum EGR valve duty to an EGR valve as the EGR valve duty when the calculated minimum EGR valve duty is greater than the EGR valve duty,
- wherein the valve duty differentiated control includes:
- a condition control for calculating the EGR valve duty correction variable in each of the engine operation region, the mixer region and the external factor region,
- a valve duty selection control using an engine operation range suitable for a setting fuel amount, and
- a valve duty reliability establishment control using the EGR valve duty correction for changing an EGR control mode in the engine operation range out of the setting fuel amount.
Dependencies are inferred from the claim text.