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汽车安全与节能学报

汽车安全与节能学报 ›› 2014, Vol. 5 ›› Issue (04): 407-412.DOI: 10.3969/j.issn.1674-8484.2014.04.015

• 汽车节能与环保 • 上一篇    

等热值替代的天然气双燃料发动机的改装和控制策略

杨博，尉星，习成训，宁小康，曾科*   

  1. 西安交通大学 能源与动力工程学院，西安710049，中国
  • 收稿日期:2014-09-09 出版日期:2014-12-25 发布日期:2014-12-29
  • 通讯作者: 曾科，教授。E-mail: kezeng_xjtu@126.com
  • 作者简介:杨博（1984 －），男（汉），宝鸡，博士研究生。E-mail: feiying121@126.com
  • 基金资助:

    国家“九七三”重点基础研究发展计划资助项目（2011CB707200）

Modification and the control strategy of equivalent heating value substitution with pilot-ignited natural gas dual-fuel engine

YANG Bo, WEI Xing, XI Chengxun, NING Xiaokang, ZENG Ke*   

  1. Xi’an Jiaotong University, School of Energy and Power Engineering, Xi’an 710049, China
  • Received:2014-09-09 Online:2014-12-25 Published:2014-12-29

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摘要：

为提高经济性和降低排放，开发了双燃料发动机电控单元（ECU）；对一高压共轨柴油发动
机进行了双燃料改装，以实现柴油引燃天然气的燃烧模式。用实验方法，验证了基于柴油等热值替
代的双燃料控制策略。结果表明：相比纯柴油模式原机，双燃料模式下给定替代率的实时控制的误
差不超过5.2% ；外特性曲线基本一致，最大扭矩增加了2.6% ；CO2 排放降低了40%，NOx 排放降低了
33% ；但总碳氢化合物排放的最大值比原机高出20 倍，CO 排放的最大值高出6 倍。这说明，本控制
策略合理可行, 适合天然气双燃料发动机。

关键词: 柴油发动机, 高压共轨, 双燃料, 天然气, 控制策略, 等热值替代

Abstract:

A direct injection, high-pressure common-rail diesel engine was converted into a diesel pilot-ignited
dual fuel engine using a developed dual-fuel engine control unit (ECU) for better economy and lower emissions.
A real-time diesel substitution rate control strategy for a dual fuel engine was proposed, and the control
strategy was validated by experiments. The results show that the substitution rate error between the target and
experiment was less than 5.2%, and the control strategy meets the demands of the dual fuel engine operation.
For the engine performance curves and emissions, the curves of the dual fuel mode were consistent with those
of the pure fuel mode. The maximum torque of the dual fuel mode increases 2.6% compared with that in diesel
mode with CO2 and NOx emissions decreasing 40% and 33%, and with the total hydrocarbon and CO peak
emissions increasing 20 and 6 times compared with those in the diesel mode. Therefore, the strategy is rational
and feasible for controlling natural gas dual-fuel engines.

Key words: diesel engine, high-pressure common-rail, dual fuel, natural gas, control strategy, equivalent heating value substitution