Reduction of cold start hydrocarbon (HC) emissions requires a proper compromise between low engine-out HC emission and fast light-off of the three way catalytic converter (TWC). In this paper, a hybrid switching system is designed and optimized for reducing HC emissions of a mid-sized passenger car during the cold start phase of FTP-75 (Federal Test Procedure). This hybrid system has the benefit of increasing TWC temperature during the early stages of the driving cycle by switching between different operational modes. The switching times are optimized to reduce the cumulative tailpipe HC of an experimentally validated automotive emission model. The designed hybrid system is tested in real-time on a real engine control unit (ECU) in a model-in-the-loop structure. The results indicate the new hybrid controller reduces the HC emissions over 6.5% compared to nonswitching cold start controller designs.
Real-Time Hybrid Switching Control of Automotive Cold Start Hydrocarbon Emission
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received November 5, 2012; final manuscript received January 14, 2014; published online March 13, 2014. Assoc. Editor: Shankar Coimbatore Subramanian.
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Salehi, R., Shahbakhti, M., and Karl Hedrick, J. (March 13, 2014). "Real-Time Hybrid Switching Control of Automotive Cold Start Hydrocarbon Emission." ASME. J. Dyn. Sys., Meas., Control. July 2014; 136(4): 041002. https://doi.org/10.1115/1.4026534
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