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METHOD AND DEVICE FOR INSPECTING AND SAFEGUARDING A FUNCTIONALITY OF AN EXHAUST GAS AFTERTREATMENT SYSTEM OF A COMBUSTION ENGINE
METHOD AND DEVICE FOR INSPECTING AND SAFEGUARDING A FUNCTIONALITY OF AN EXHAUST GAS AFTERTREATMENT SYSTEM OF A COMBUSTION ENGINE
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机译:检查和保障燃烧发动机尾气后处理系统功能的方法和装置
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摘要
The invention relates to a method for inspecting and safeguarding a functionality of an exhaust gas aftertreatment system (100) of a combustion engine, wherein the exhaust gas aftertreatment system (100) has an exhaust gas catalytic converter (110) and a voltage source (140), wherein the exhaust gas catalytic converter (110) has an exhaust gas catalysis region (112) and an electrical heater (114) that is selectively supplied with electrical energy by the voltage source (140), wherein the method has the following steps: - determining an actual value (302) that is characteristic of an ohmic resistance of the heater (114), wherein the actual value (302) is determined using an electric current intensity supplied to the heater (114) and a voltage supplied to the heater (114) from the voltage source (140), - providing a setpoint value (304) that is characteristic of an expected ohmic resistance of the heater (114), wherein the setpoint value (304) takes into consideration a specific heating behaviour of the heater (114) and an expected long-term behaviour of the exhaust gas catalytic converter (110).
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