Abstract:
본발명은선택적환원촉매의작동을제어하는제어로직에행해지는보정의신뢰성을확보할수 있는선택적환원촉매의제어로직의보정적합성판단방법및 장치에관한것이다. 본발명의실시예에따른선택적환원촉매의제어로직의보정적합성판단방법은보정이시행된경우, 이전오차와현재오차를기초로보정적합도(suitability function of correction)를계산하는단계; 상기보정적합도를기초로적합도계수를계산하는단계; 보정횟수와적합도횟수를기초로보정이적절하였는지를판단하는단계; 그리고보정이적절하지않았다면, 제어로직을리셋하는단계;를포함할수 있다.
Abstract:
본 발명은 디젤 차량에 장착되는 SCR촉매의 축(길이) 방향 온도차이를 고려하여 암모니아의 흡장량을 제어하는 것으로, SCR촉매 전/후단의 센서로부터 제반 정보를 수집하는 과정, SCR촉매 전/후단 온도에 따라 SCR촉매의 내부를 온도차가 유지되는 N개의 블록으로 구분하는 과정, 구분된 각 블록에 축(길이) 방향 반응모델 모듈을 적용하여 블록별 필요 암모니아 양을 계산하는 과정, 블록별로 계산되는 필요 암모니아 양을 합산하여 SCR촉매 전체의 필요 암모니아 양을 계산하여 흡장량을 제어하는 과정을 포함한다. SCR촉매, 축(길이) 방향 온도, 암모니아 흡장량, 블록 구분
Abstract:
PURPOSE: An exhaust gas purification system for a vehicle is provided to reduce a mixed area of a reducing agent and exhaust gas by changing the mounting position of an injector. CONSTITUTION: An exhaust gas purification system(100) for a vehicle comprises an SCR catalyst(40) and an injector(50). The SCR catalyst is installed in the rear end of a DOC-DPF catalyst. The DOC-DPF catalyst is composed of a coating area and a non-coating area. The injector is installed in the front end of the DOC-DPF catalyst and injects a reducing agent through the non-coating area in the stream direction of exhaust gas.
Abstract:
PURPOSE: A method and a system for determining the deterioration rate of an oxidation catalyst are provided to easily determine the deterioration rate of catalyst by calculating the temperature of exhaust gas through a simple formula and comparing the theoretical temperature with the actual temperature. CONSTITUTION: A method for determining the deterioration rate of an oxidation catalyst. The actual inlet temperature of exhaust gas passing through the entrance of an oxidation catalyst(130) is measured. The temperature of the theoretical interior gas passing through the oxidation catalyst is computed using the actual inlet temperature. The theoretical outlet temperature of the exhaust gas passing through the exit of the oxidation catalyst is computed using the actual inlet temperature and the theoretical interior gas temperature. At the state excluding the oxidation heat of the oxidation catalyst, the temperature and theoretical outlet temperature of the theoretical interior gas are calculated. The actual outlet temperature of the exhaust gas passing through the exit of the oxidation catalyst is measured. The difference between the theoretical outlet temperature and the actual outlet temperature is computed. The degradation rate of the oxidation catalyst is determined by comparing the difference with the set value.
Abstract:
A urea mixing inducement apparatus for SCR is provided to improve mixing property between urea solution and nitrogen oxide and to activate conversion of the nitrogen oxide by increasing motion energy of exhaust gas by spraying gas of high temperature and pressure to the front or rear end of a urea injector in the tangential direction of sectional surface of the exhaust pipe. A urea mixing inducement apparatus for SCR includes a high-pressure gas pipe(13) connected to an exhaust manifold(12) so as to guide gas of high temperature and pressure to an exhaust pipe(11), an inflow port connected to the high-pressure gas pipe and formed in the exhaust pipe so as to guide the gas of high temperature and pressure to the front or rear end of a urea injector(10) spraying urea solution.
Abstract:
A urea injection control apparatus of an exhaust system catalytic device of a vehicle and a method thereof are provided to maximize purifying efficiency of NOx because the calculated wall wetting amount as described above is integrated and the total amount of the wall wetting is reckoned. A urea injection control method of an exhaust system catalytic device of a vehicle comprises a step(S102) which determines whether the engine drive condition is in the active state of the catalytic device or not; a step(S104) which determines purifying efficiency of NOx according to the driving condition and decides the ammonia amount needed when the catalytic device is in active; a step(S105) which determines amount of the urea aqueous solution needed; and a step(S107) which determines amount of the urea aqueous solution(S106) and sprays it.