Stability test of cold starting speed rising stage for heavy duty diesel engine under plateau environment(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年01期
- Page:
- 120-126
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Stability test of cold starting speed rising stage for heavy duty diesel engine under plateau environment
- Author(s):
- LOU Di-ming; KAN Ze-chao; CAO Zhi-yi; ZHI Huai-bin; LIU Sheng; HU Zhi-yuan
- 1. School of Automobile, Tongji University, Shanghai 201804, China; 2. China North Engine Research Institute, Datong 037036, Shanxi, China
- Keywords:
- automobile engineering; heavy duty diesel engine; plateau environment; low temperature; cold starting; speed rising stage
- PACS:
- U464.172; TK421
- DOI:
- -
- Abstract:
- To improve the stability of diesel engine in the speed rising stage of starting process in plateau, taking a heavy duty diesel with a high pressure common rail system as test prototype, the stability of heavy duty diesel in cold starting speed rising stage was investigated at the altitude from 1 to 4 km by a test platform with simulated environment of plateau and low temperature. Moreover, the cold starting performance of engine in the environment was improved through reducing faltering in the speed rising stage by adjusting the fuel injection mass and the advanced injection angle. The results show that faltering appears in speed rising stage of the test prototype at an altitude of over 2 km, under the temperature of -30 ℃. With the increase of altitude, the speed reduces in faltering stage, the occurrence proportion of faltering rises, and the stability in the speed rising stage becomes poor. With the rising of each 1 km in altitude, speed reduces 195 r/min, and the proportion of faltering increases 30.9%. The occurrence of faltering in speed rising stage can be prevented by properly reducing injection mass and increasing advanced injection angle. When the cyclic injection mass is properly reduced, for the test prototype under -30 ℃ at altitude lower than 3 km, the proportion of faltering reduces from 83.7% in scheme A to 68.3% in scheme C, the range of the faltering stage reduces from 75 to 40 r/min, and the speed increases from 346 to 385 r/min. When advanced injection angle is properly increased, the proportion of faltering reduces from 68.3% in case 1 to 34.8% in case 3, the range of which reduces from 40 to 24 r/min, and the speed increases from 401 to 638 r/min. Therefore the cold starting performance of heavy duty diesel engine in the speed rising stage is improved under plateau environment.
Last Update: 2017-01-22