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| Experimental Study on Fuel Injection in Diesel Engine Start-up Condition of Heavy Vehicle |
| Received:May 22, 2018 Revised:August 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.08.017 |
| KeyWord:injection rule start-up condition bench test diesel engine |
| Author | Institution |
| WANG Xue |
Department of Vehicle Engineering, Academy of Army Armored Force, Beijing , China |
| XU Dong-dong |
Department of Vehicle Engineering, Academy of Army Armored Force, Beijing , China |
| YANG Shao-qing |
Department of Vehicle Engineering, Academy of Army Armored Force, Beijing , China |
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| Abstract: |
| Objective To study fuel injection in diesel engine start-up condition of heavy vehicle. Methods Based on the Bosch long tube method, a test bench of fuel injection law of a heavy-duty diesel engine mechanical pump during start-up process was set up. The variation of pressure, injection rate and fuel injection duration of fuel injection pump under different start-up operating conditions was analyzed. Results With the increase of pump speed during start-up, the peak value of pump increased by 36.18% and peak phase position forward leaded by 13.9°(CA), and the injection rate increased. After the pump speed was stabilized, the shape of pump pressure curve and fuel injection rate curve became stable. The variation law of the pressure at the pump end was consistent with that of the pressure at the pump end. The duration of the fuel injection increased gradually with the increase of the average speed during the start-up process, and the amount of circulating fuel injection tended to be stable. Conclusion Under the condition of low speed starting conditions, the mechanical fuel pump has small circulating pump pressure, rear phase, low circulating ejection rate and rear phase, short injection duration, small cycle fuel injection quantity, and poor starting performance. With the increase of the fuel injection pump speed, circulating pump pressure, injection rate, injection cycle duration and circulating cycle fuel injection quantity tend to be stable. The diesel engines are more likely to be started. |
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