CN106968812B - 天然气发动机蝶阀式egr控制方法 - Google Patents
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- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
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- F02D2200/00—Input parameters for engine control
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- F02D2200/1002—Output torque
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Abstract
本发明公开了一种天然气发动机蝶阀式EGR控制方法,本方法以EGR阀需求开度作反馈信号进行内层小闭环控制,以EGR率需求值作反馈信号进行外层大闭环控制,从而精确控制通过EGR阀的废气流量。本发明通过EGR率的准确闭环和EGR阀开度闭环的控制响应,可在实际标定或者运行中,对废气流量的控制特别是瞬态的控制都可达到相对精确,进而保证更加充分的燃烧和高规格的排放指标。
Description
技术领域
本发明属于发动机技术领域,具体涉及一种天然气发动机蝶阀式EGR控制方法。
背景技术
随着城市环境污染越来越严重,政府对发动机的排放要求越来越高,欧六排放限值已确定,欧六的推广不可避免。天然气发动机欧六系统可采用稀燃和当量燃烧,但是稀燃成本高,耐久性弱,缺点明显;而当量燃烧热负荷较大,为了降低NOx排放,发动机将引进废气再循环技术,即EGR技术。
目前使用的EGR阀为蝶阀式节流阀,对于车用发动机来说,一般情况下,脚踏板是最重要的需求来源,因此计算EGR开度或者EGR率的源头均是脚踏板开度,然后进行一系列计算设定。运行时根据踏板需求控制EGR阀开度,实行EGR阀开度闭环,根据氧传感器反馈修正EGR率。其控制流程参考图1,以脚踏板开度为源头计算节气门开度,根据发动机不同的转速和节气门开度,计算出节气门前后压力,根据节气门后压力,计算出所需要的EGR率继而得到EGR阀需求开度,根据EGR闭环PID调节得到实际的EGR阀开度。从控制流程看,并没有实行EGR率闭环,仅靠EGR阀开度闭环,随着工作环境的变化,EGR率变化不可控。
由此而见,由于蝶阀式节流阀流体特性并不是线性的,因此这种控制方法存在运行过程中EGR率瞬态偏差较大、修正慢的弊端,可能会恶化排放和经济性。
发明内容
本发明所要解决的技术问题是提供一种能够更精确控制通过EGR阀的废气流量、从而更精确控制燃烧和排放的天然气发动机蝶阀式EGR控制方法。
为解决上述技术问题,本发明的技术方案是:
天然气发动机蝶阀式EGR控制方法,以EGR阀需求开度作反馈信号进行内层小闭环控制,以EGR率需求值作反馈信号进行外层大闭环控制,从而精确控制通过EGR阀的废气流量。
具体步骤如下:
步骤一、计算EGR率需求值和EGR阀需求开度
以脚踏板开度为源头得到发动机扭矩需求,根据发动机扭矩需求得到扭矩对应的总充气量需求值,然后计算出EGR率需求值,继而得到EGR阀废气流量需求值,进一步得到EGR阀需求开度;
步骤二、EGR闭环控制
根据节流阀的流体特性,在EGR闭环控制方面分成节流区控制和非节流区控制:
(a)节流区控制
根据EGR阀前后压比计算EGR阀废气实际流量值、EGR率实际值和EGR阀实际开度,此时EGR阀实际开度也是EGR阀需求开度;根据节气门控制调节和EGR率的自学习功能来修正计算的EGR率实际值;即此处控制为EGR率闭环控制、EGR阀开度开环控制;
(b)非节流区控制
根据总充气量计算节气门处空气流量,减去发动机进入的纯空气流量,得到EGR阀废气实际流量值,进而计算得到EGR率实际值和EGR阀实际开度,此时EGR阀实际开度控制由PI调节,形成EGR阀开度闭环控制;EGR率实际值由EGR率的自学习功能修正来实现;即此处控制为EGR率闭环控制、EGR阀开度闭环控制。
由于采用了上述技术方案,本发明具有以下有益效果:EGR阀开度控制是基于EGR率的需求值,而不仅是单纯的基于EGR阀开度位置需求值,即采取双闭环控制。内层闭环以EGR阀开度位置作反馈信号,而外层大闭环以计算的EGR率作为反馈,这样有了EGR率的准确闭环和EGR阀开度闭环的控制响应,可在实际标定或者运行中,对废气流量的控制特别是瞬态的控制都可达到相对精确,进而保证更加充分的燃烧和高规格的排放指标。
附图说明
以下附图仅旨在于对本发明做示意性说明和解释,并不限定本发明的范围。其中:
图1是现有技术中EGR控制方法的流程示意图;
图2是本发明实施例中EGR控制方法的流程示意图。
具体实施方式
下面结合附图和实施例,进一步阐述本发明。在下面的详细描述中,只通过说明的方式描述了本发明的某些示范性实施例。毋庸置疑,本领域的普通技术人员可以认识到,在不偏离本发明的精神和范围的情况下,可以用各种不同的方式对所描述的实施例进行修正。因此,附图和描述在本质上是说明性的,而不是用于限制权利要求的保护范围。
天然气发动机蝶阀式EGR控制方法,其基本控制原理为:以EGR阀需求开度作反馈信号进行内层小闭环控制,以EGR率需求值作反馈信号进行外层大闭环控制,从而精确控制通过EGR阀的废气流量。
参考图2,具体步骤如下:
步骤一、计算EGR率需求值和EGR阀需求开度
以脚踏板开度为源头得到发动机扭矩需求,根据发动机扭矩需求得到扭矩对应的总充气量需求值,然后计算出EGR率需求值,继而得到EGR阀废气流量需求值(设定值),进一步得到EGR阀需求开度(设定开度);
步骤二、EGR闭环控制
根据EGR阀(为节流阀)的流体特性可知,流经节流阀的气体流量和压比不是线性化的,在节流区和非节流区差异很大,因此在EGR闭环控制方面分成节流区控制和非节流区控制:
(a)节流区控制
根据EGR阀前后压比,计算EGR阀废气实际流量值、EGR率实际值和EGR阀实际开度,此时EGR阀实际开度也是EGR阀需求开度(设定开度);根据节气门控制调节和EGR率的自学习功能来修正计算的EGR率实际值,此功能可近似相当于节气门自学习或者氧传感器的自学习;此处控制可看成为EGR率闭环控制、EGR阀开度开环控制;
(b)非节流区控制
根据总充气量计算节气门处空气流量,减去发动机进入的纯空气流量,得到EGR阀废气实际流量值,进而计算得到EGR率实际值和EGR阀实际开度,但是计算可能会有偏差,因此此时EGR阀实际开度控制由PI(比例积分)调节,形成EGR阀开度闭环控制;EGR率实际值由EGR率的自学习功能修正来实现;此处控制为双闭环,即EGR率闭环控制、EGR阀开度闭环控制。
以上所述仅为本发明示意性的具体实施方式,并非用以限定本发明的范围。任何本领域的技术人员,在不脱离本发明的构思和原则的前提下所作出的等同变化与修改,均应属于本发明保护的范围。
Claims (1)
1.天然气发动机蝶阀式EGR控制方法,其特征在于:以EGR阀需求开度作反馈信号进行内层小闭环控制,以EGR率需求值作反馈信号进行外层大闭环控制,从而精确控制通过EGR阀的废气流量;
具体步骤如下:
步骤一、计算EGR率需求值和EGR阀需求开度
以脚踏板开度为源头得到发动机扭矩需求,根据发动机扭矩需求得到扭矩对应的总充气量需求值,然后计算出EGR率需求值,继而得到EGR阀废气流量需求值,进一步得到EGR阀需求开度;
步骤二、EGR闭环控制
根据节流阀的流体特性,在EGR闭环控制方面分成节流区控制和非节流区控制:
(a)节流区控制
根据EGR阀前后压比计算EGR阀废气实际流量值、EGR率实际值和EGR阀实际开度,此时EGR阀实际开度也是EGR阀需求开度;根据节气门控制调节和EGR率的自学习功能来修正计算的EGR率实际值;即此处控制为EGR率闭环控制、EGR阀开度开环控制;
(b)非节流区控制
根据总充气量计算节气门处空气流量,减去发动机进入的纯空气流量,得到EGR阀废气实际流量值,进而计算得到EGR率实际值和EGR阀实际开度,此时EGR阀实际开度控制由PI调节,形成EGR阀开度闭环控制;EGR率实际值由EGR率的自学习功能修正来实现;即此处控制为EGR率闭环控制、EGR阀开度闭环控制。
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