| 摘要 |
A method for controlling an exhaust gas recirculation (EGR) for preventing a valve from sticking may include performing an EGR cooler by-pass valve (ECB V/V) normal mode for operating an ECB V/V under a low temperature and low load condition to prevent fouling of an EGR cooler and overcooling of an EGR gas, when an EGR is controlled with a vehicle driven; and if the EGR control continues, performing an ECB V/V self-cleaning mode for operating the ECB V/V in consideration of an engine condition when the off-state of the ECB V/V is determined and an ECB V/V sticking detection mode for detecting sticking of the ECB V/V in continuous performing, cold performing, and in-driving performing in consideration of an opening amount of the ECB V/V when a fixated state of the ECB V/V is determined. Accordingly, the operation area of the ECB V/V for preventing fouling (deterioration of efficiency due to accumulation of carbon) of the EGR cooler and overcooling of the EGR gas is widened, and particularly, sticking of the ECB V/V is prevented, so that it is possible to improve reliability of hardware protected from thermal deterioration at the intake side and satisfy the regulations under field in-use. |
