Experimental Research on Exhaust Thermal Management Control Strategy for Diesel Particular Filter Active Regeneration
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ght © 2020 KSAE/ 11712 pISSN 12299138/ eISSN 19763832
EXPERIMENTAL RESEARCH ON EXHAUST THERMAL MANAGEMENT CONTROL STRATEGY FOR DIESEL PARTICULAR FILTER ACTIVE REGENERATION Jian Wang1)*, Bin Wang1) and Zheng Cao2) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212000, China 2) Power-train Application Department, United Automotive Electronic System Co., Ltd., 555 Rongqiao Rd., Pudong New District, Shanghai 200000, China
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(Received 17 September 2019; Revised 13 December 2019; Accepted 16 December 2019) ABSTRACTThe regeneration was the main barrier restricting the development of diesel particulate filter (DPF), and the exhaust thermal management control strategy are the premise of efficient DPF active regeneration. This paper took a light vehicle equipped with high-pressure common rail diesel engine as the object, studied the influences of exhaust thermal management including intake throttling, fuel injection strategies and late post injection (LPI) coupling diesel oxidation catalyst (DOC) on exhaust temperature by experiment. The results indicated that the reduction of intake throttle valve opening at low speed and light load working conditions, where the exhaust temperatures were low, could dramatically increase the exhaust temperature. With a reasonable match of fuel injection parameters, the exhaust temperature could be increased. LPI coupling DOC could have a further increment on exhaust temperature, but it would have obvious negative effects on fuel economy and hydrocarbon emissions at the same time. In this paper, a comprehensive exhaust thermal management control strategy was proposed. The test bench indicated clearly that the demand of DPF regeneration temperature can be met in most working conditions through the reasonable integrated control strategies of exhaust thermal management. KEY WORDS : Diesel, DPF (Diesel Particulate Filter), Exhaust Thermal Management, Control Strategy
1. INTRODUCTION
California Air Resources Board (CARB) finalized the low emissions vehicle (LEV III) emissions standards, calling for a 90 % cut in PM, down to 0.625 mg/km, by 2025. (Joubert and Seguelong, 2004). Therefore, it is critical to reduce diesel engine emissions to satisfy the stricter emission regulations. In order to meet the strict emission standards, the development of light-duty vehicles has been focused on optimization of engine structure, clean combustion and after-treatment systems. Modern techniques such as low temperature combustion (LTC) and homogeneous charge compression ignition (HCCI) need further research to be applied in commerce (Northrop et al., 2007). The difficulties in minimizing particulate emissions for internal purification technologies such as electronically controlled high pressure common rail system, supercharged intercooling and multi valves lie on reasonable cooperation with each other (Ishikawa et al., 2004; Johnson, 2009). As a result, after-treatment technology has become the main measure to control PM emissions (Xu et al., 2010). The utilization of diesel
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