首页>
外国专利>
METHOD FOR PREVENTING A RISK OF FREEZING IN A REDUCING-AGENT FEEDING DEVICE OF A SELECTIVE CATALYTIC REDUCTION SYSTEM
METHOD FOR PREVENTING A RISK OF FREEZING IN A REDUCING-AGENT FEEDING DEVICE OF A SELECTIVE CATALYTIC REDUCTION SYSTEM
展开▼
机译:选择性催化还原系统的还原剂给料装置中防止冻结风险的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
Disclosed is a method for preventing a risk of freezing in a device for supplying reducing agent to a selective catalytic reduction system in an exhaust line, a freezing temperature specific to the agent being stored in memory, the system including a controller operating the system and emitting pulses to an injector, the controller being inactive when the engine is switched off. With the combustion engine switched off, the controller is woken up at predetermined intervals to initiate an emission of a specific electric pulse to the injector with measurements of a current-strength and voltage of the electric pulse providing a value of the electrical resistance of the injector. A temperature of the reducing agent at the injector is estimated as a function of the measured resistance and, when at least the temperature thus estimated is below the freezing temperature, a purge of the device is initiated.
展开▼