吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (2): 483-489.doi: 10.13229/j.cnki.jdxbgxb201702019

• • 上一篇    下一篇

怠速转速和节气门开度对停机特性及直接起动模式实现的影响

孙文旭, 洪伟, 解方喜, 苏岩, 姜北平, 李翔宇   

  1. 吉林大学 汽车仿真与控制国家重点试验室,长春 130022
  • 收稿日期:2015-12-12 出版日期:2017-03-20 发布日期:2017-03-20
  • 通讯作者: 解方喜(1982-),男,讲师,博士.研究方向:内燃机工作过程优化与控制.E-mail:xiefx2011@jlu.edu.cn
  • 作者简介:孙文旭(1983-),男,博士研究生.研究方向:内燃机工作过程优化与控制.E-mail:sunwenxu2009@126.com
  • 基金资助:
    国家自然科学基金项目(51206059).

Effects of idle speed and throttle opening on engine shutdown characteristics and realization of direct start mode

SUN Wen-xu, HONG Wei, XIE Fang-xi, SU Yan, JIANG Bei-ping, LI Xiang-yu   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2015-12-12 Online:2017-03-20 Published:2017-03-20

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241

摘要： 针对一台4G15 缸内直喷汽油机试验研究了停机前怠速转速及停机过程节气开度对发动机停机特性及直接起动模式实现的影响。研究结果表明:随着停机前怠速转速的升高,停机过程曲轴平均转过的圈数显著增加。然而,在节气门开度较小的条件下,单纯提高停机前怠速转速对缸内废气的清除效果有限,且膨胀缸活塞最终停止相位具有极大的随机性,直接起动模式均难以实现。随着停机过程节气门开度的增加,曲轴平均转过的圈数增大,膨胀缸活塞最终停止的相位变化范围减小,在气缸中间位置的停止概率显著升高。同时,增大节气门开度也是一种极为有效清除缸内残余废气的技术措施,可使直接起动模式首循环着火和直起成功的概率显著升高。

关键词: 动力机械工程, 缸内直喷汽油机, 怠速转速, 节气门开度, 转动特性, 直接起动模式实现

Abstract: The effects of idle speed and throttle opening on the engine shutdown characteristics and the realization of direct start mode were studied on a 4G15 gasoline direct injection engine. Results show that the average number of rotations during the shutdown process significantly increases with the idle speed. However, when the throttle opening is small, simply raising the idle speed before shutdown, the effect for cylinder exhaust scavenging is limited, and the final stop phase of the expansion cylinder piston has great randomness, which was difficult to the realization of direct start mode. With the increase in the throttle opening, the number of rotations of the crankshaft increases, the final stop phase range of the piston in the expansion cylinder decreases, and the stop probability in the middle position of the cylinder significantly decreases. At the same time, increasing the throttle opening is also a very effective method to remove the residual gas inside the cylinder, which can significantly increase the success probability of the first cycle ignition and the direct starting.

Key words: power machinery and engineering, direct injection gasoline engine, idle speed, throttle opening, engine shutdown characteristics, realization of direct start mode

中图分类号: 

  • TK411
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