Abstract
Urea line heating system is critical for Selective Catalytic Reduction (SCR) aftertreatment system under low temperature environment. Traditionally, the Electronic Control Unit (ECU) motivates urea lines heating command and diagnostics directly. This paper illustrates a Controller Area Network (CAN)-based line heater architecture development for the SCR aftertreatment system, as well as the diagnostics generation. The CAN-based line heater diagnostics is validated on vehicle experimental with four different given cases. It can be seen from the validation results that the diagnostics logic and algorithm are reasonable, and the line heater failure modes could be detected correctly including open circuit, short circuit and inducement. In addition, the failure modes are able to set or clear for each of the urea lines according to the diagnostics logic. ECU and ECU1 could communicate well between each other by CAN. This study introduces a new line heater architecture for SCR aftertreatment system which is meaningful for the whole vehicle assembly, which could be considered in the real application in future.
Highlights
Selective Catalytic Reduction (SCR) system is demonstrated as an effective way to reduce nitrogen oxides (NOx) emission for diesel engine system and this technique is widely used so as to meet more and more critical emission regulations on NOx emission requirements
This Controller Area Network (CAN)-based urea line heater diagnostics provides a new option for line heating system when there are two Electronic Control Unit (ECU), one ECU on engine and the other on vehicle
In order to validate the diagnostics in this CAN-based line heater system, four cases are simulated on vehicle to monitor different conditions
Summary
SCR system is demonstrated as an effective way to reduce nitrogen oxides (NOx) emission for diesel engine system and this technique is widely used so as to meet more and more critical emission regulations on NOx emission requirements. The urea would be injected into mixer with exhaust gas when SCR catalyst bed temperature is at the appropriate value under the certain duty cycle condition, to guarantee the best NOx conversion efficiency for lower NOx emission. It has been seen that urea decomposition would be affected by temperature. There are several researches that consider solutions to deposit issue under low temperature. Chen, and Li et al showed the effect to urea decomposition by temperature, which was a very critical factor on deposit issue of SCR system [1]–[4]. Scott Sluder and Tang et al undertook urea decomposition under low temperature, as well as the effects on SCR performance [5]–[7]. Lecompte and Ning et al used dosing control strategy to manage urea
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