EGR Temperature Estimation Model Including the Effect of Coolant Flow Rate for ECU Implementation 2020-01-0264
Recent gasoline engines utilize more aggressive EGR rate to meet the emissions and fuel economy regulations. The EGR temperature is often estimated by the ECU and its accuracy affects the estimations of EGR flow rate and intake air flow rate and temperature in the ECU. Therefore, the accuracy of EGR temperature estimation becomes more important than ever for precise EGR rate control. Typical lookup map based EGR cooler model without the sensitivity to the coolant flow rate is acceptable and widely used if the heat capacity of the coolant side is high enough. However, the coolant flow rate under real vehicle driving condition often visit lower range where the lookup map based model suffers from the accuracy issues. This paper presents an investigation of the accuracy of the lookup map based model under different heat capacity conditions. In this study, a simple EGR cooler model based on effectiveness-NTU (Number of Heat Transfer Unit) method was also developed for ECU implementation. This model is intended to improve accuracy of the temperature estimation especially at lower coolant flow rates. Coolant flow rate used in this model is calculated with a regressed model, which is a function of engine speed and coolant control valve opening. The flow rate data for the regression was generated using a system simulation for an engine with integrated thermal management system.
Kyoung Hyun Kwak, Dewey Jung, Yong Sun, Jason Hoon Lee, Jinho Ha, Byungho Lee
University of Michigan - Dearborn, Hyundai-Kia America Technical Center Inc.