Using Electric Supercharger to Reduce Smoke Emission from
Diesel Engine at Acceleration Process

YAO Chunde¹  LIU Xiaoping¹  ZHOU Hongxiu^{1, 2}  HUANG Yu¹  LI Shuai¹

(1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072;
2. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023)

Abstract: During quickly accelerating and sharply increasing load, the mass rate of air to engine doesn’t consist with the variation of fuel flow, which results in air-fuel ratio decrease and makes the quality of mixture bad. As a result, the combustion of engine becomes worse and the smoke emission increases. To solve this problem, the air intake is modified by installing an electric supercharger (ES) in parallel with the original intake manifold, which makes the intake air be boosted to engine by the ES during the transient operations. Test results showed that ES injecting air to engine under transient operating conditions of increasing speed or torque improves the combustion quality of engine and reduces the smoke emission, as well as boost power output. The improvement is more remarkable especially under the low speed and high torque transient conditions.

Key words: Electric supercharger Diesel engine Transient state Emission smoke

CLC No: TG156

国家自然科学基金资助项目(20533040, 50376045, 50576064). Received 20070405, received in revised form 20070929

References

[1] ZOU Jitian, BAI Gang, SHEN Qingyan et al. Study on reduce smoke emission from diesel engine at free acceleration process[J]. Internal Combustion Engines, 1997(2): 28-30.
[2] WANG Jun. Free acceleration smoke from diesel and adjustable smoke limiter[J]. Modern Vehicle Power, 2001(3): 16-18.
[3] BAZARI Z. The transient performance analysis of a turbocharged vehicle diesel engine with electronic fuelling control [G], SAE, 900236, 1990.
[4] MA Jie, GU Hongzhong. Improvement on transient response of turbocharged diesel engine by the combined charging with changeover System[J]. Transactions of CSICE, 1989, 7(2): 111-116.
[5] ZHANG Yusong, YIN Qi, WU Jingchuan. A study on reducing exhaust smoke of diesel bus engines in rapid acceleration by additional air injection[J]. Chinese Internal Combustion Engine Engineering, 2002, 23(1): 53-55.
[6] LORENZO D, GIUSEPPE P, BERNARDO F. VGT turbocharger controlled by an adaptive technique[J]. IEEE/ASME Transactions on Mechatronics, 2003, 8(4):  492-499.
[7] KOLMANOVSKY I, STEFANOPOULOU A G, POWELL B K. Improve turbocharged diesel engine operation with turbo power assist system[C]//International Conference on Control Applications, Hawaii. 1999, 6: 454-459.
[8] KATRASNIK T, RODMAN S, TRENC F. Improvement of the dynamic characteristic of an automotive engine by a turbocharger assisted by an electric motor[J]. Transactions of the ASME, Journal of Engineering for Gas Turbines and Power, 2003, 125: 590-595.
[9] YAO Chunde, ZHOU Hongxiu. Design and characteristics on electric supercharger for diesel engine acceleration by additional air rapid injection[J]. Chinese Journal of Mechanical Engineering, 2006, 42(6): 184-187.