Abstract:
PURPOSE: A desulfurization method of a nitrogen oxide absorbing catalyst system is provided to simplify the regeneration logic of desulfurization by deciding the desulfurization time based on the number of success in the regeneration of DPF(Diesel Particulate Filter), since all the trace sulfur compounds included in the exhaust gas ejected when the ultra low sulfur diesel oil is used become poison to an LNT(Lean NOx Trap) catalyst. CONSTITUTION: A desulfurization method of a nitrogen oxide absorbing catalyst system comprises the following steps: determining(S110) whether the number of the success of DPF regeneration reaches the predetermined number of the success of DPF regeneration or not; performing(S120) desulfurization by terminating the DPF regeneration when the number of success of the DPF regeneration reaches the predetermined number of success of the DPF regeneration; entering the desulfurization mode; terminating(S160) the desulfurization after performing the desulfurization for the predetermined time; calculating and calibrating(S170) the amount of the collected PM-10(fine dust) in the DPF generated during the time of desulfurization after the termination of the desulfurization; determining the time for the following DPF regeneration; and comparing the temperature(T) of the inside of the nitrogen oxide absorbing catalyst with the deterioration temperature(X) of the nitrogen oxide absorbing catalyst during the time of the desulfurization. [Reference numerals] (S100) Normal NO_X purification operation mode; (S110) Reaching a predetermined number of success of DPF regeneration?; (S120) Immediately entering a desulfurization mode after terminating the DPF regeneration; (S130) Maintaining a lambda(λ) value below a predetermined value; (S140) LNT catalyst inside temperature(T) > Deterioration temperature(X) ?; (S150) Desulfurization for a predetermined time?; (S160) Terminating the desulfurization; (S170) Calculating and correcting the amount of PM collected in a DPF caused by PM produced during the desulfurization; (S180) Switching the mode to a normal lean operation for preventing overheating of catalyst; (S190) LNT catalyst inside temperature(T) ≤ Predetermined temperature(Y)
Abstract:
PURPOSE: A steel for a cage of a constant velocity joint and a cage of a constant velocity joint using the same are provided to improve intensity and impact toughness of a cage capering to the existing material cage. CONSTITUTION: A steel for a cage of a constant velocity joint comprises carbon(C) of less than 0.12~0.18 weight%, silicon(Si) of 0.10~0.20 weight%, manganese(Mn) of 1.20~1.50 weight%, phosphorus(P) of less than 0.03 weight%, nickel(Ni) of 0.50~1.00 weight%, sulfur(S) of less than 0.03 weight%, chrome(Cr) of 0.20~0.40 weight%, titanium(Ti) of 0.02~0.05 weight%, nitrogen(N) of 0.01~0.02 weight%, aluminum(Al) of 0.01~0.03 weight%, boron(B) of 10~40ppm, and iron remainder(Fe). A cage(15) of constant velocity joint is located between an inner-race(13) and an outer-race(12). The iron is the main component of the cage. The cage of the constant velocity joint regulates the location of the axial direction and radial direction of the inner-race and outer-race.
Abstract:
PURPOSE: A device and method for purifying secondary injection exhaust gas from vehicle is provided to improve the purifying efficiency of exhaust gas following with the dynamic operation of an engine. CONSTITUTION: A device and method for purifying secondary injection exhaust gas from vehicle comprises a harmful material purification catalyst(10), a secondary injection system, and a controller(40). The harmful material purification catalyst is installed in the fixed position of an exhaust pipe(6) connected to an engine(2). The secondary injection system supplies reducing agent or fuel to catalyst. The controller determines an operation section according to engine RPM and fuel ejection amount under a secondary spray condition. The controller determines a secondary fuel injection pattern by applying a secondary ejection map based on the operation section. The controller purifies NOx and particulate matters by supplying fuel or reducing agent to catalyst using the secondary injection system.
Abstract:
PURPOSE: An oil pressure monitoring method for a diesel engine is provided to enable a user to check the time to replace engine oil by determining the oil replacement of a diesel engine through the oil pressure of a diesel engine. CONSTITUTION: An oil pressure monitoring method for a diesel engine comprises following steps. Whether a vehicle has moved over constant mileage or a vehicle is traveled up to constant km after the completion of post-injection is determined(S16). If the first step is satisfied, whether or not an engine operation condition for measuring engine oil pressure is measured is determined(S18). If the second step is satisfied, whether or not the operation condition of the second step is maintained for fixed time(S20). If the third step is satisfied, the engine oil pressure is measured(S22). Whether or not the engine oil pressure measured in the fourth step is less than the preset limit value at the engine drive condition of the second step(S24).
Abstract:
본 발명은 디젤엔진 배기가스 저감 장치에 관한 것으로, 일측에 산소 분사 신호에 따라 압축되어 있던 산소를 분사하는 산소압축/분사부; 및 배기가스의 산소량을 감지하여 상기 산소량이 소정의 기준 산소량 미만인 경우에 상기 산소압축/분사부로 상기 산소 분사 신호를 인가하는 산소 감지부를 포함함으로써, CPF 전단의 산소량을 일정 수준 이상으로 유지할 수 있어 LNT 탈황과 CPF 재생의 연비를 개선시킬 수 있다. 배기가스, CPF, LNT