CN108361113B - 汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法 - Google Patents
汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法 Download PDFInfo
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Abstract
本发明公开了一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,其中,在本发明中,由于计算出了瞬态过程中的油膜量,因此通过汽油喷射量计算得到的天然气喷射量可以更好的与当前进气量对应上,使得瞬态过程燃烧空燃比更为可控,减小污染物排放。
Description
技术领域
本发明涉及一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,属于发动机排放控制系统技术领域。
背景技术
对于从汽油发动机改装而来的汽油天然气两用燃料发动机,当以天然气模式进行工作时,由于不需要进行汽油喷射,因此都通过天然气ECU来截断原汽油喷射信号,在截断的过程中采集到汽油喷嘴的喷射脉宽信号,同时为了防止汽油ECU识别到喷嘴驱动信号被截断,天然气ECU还向汽油ECU反馈一个模拟的汽油喷嘴响应信号。在天然气喷射量的控制上,目前比较主流的做法是,是根据截取汽油喷射信号时采集到的汽油喷射脉宽计算出当前汽油喷射量,然后以一定的比例转换成天然气喷射量,然后驱动天然气喷嘴执行。
在稳态工况下,通过标定或喷射参数设置,可以使得天然气燃烧模式下的空燃比与汽油模式下的空燃比非常接近,但是在瞬态工况下,由于汽油需要考虑油膜的建立和消除,因此汽油ECU所计算的汽油喷射量中是考虑了油膜量的,而天然气燃烧模式下没有油膜效应,如果此时依然以汽油喷射量同比例计算天然气喷射量,将会发生在瞬态加速过程中空燃比偏浓,瞬态减速过程中空燃比偏稀的问题,使得排放超标。
因此,如果能提出一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,能够识别到瞬态过程中汽油喷射量中的油膜量,使得根据汽油喷射脉宽计算得到的天然气喷射量刚好与当前的进气量对应上,实际燃烧的空燃比依然与原汽油模式下一致,降低瞬态过程中的污染物排放量,对于使用过程中经常处于瞬态工况的两用燃料发动机而言,意义重大。
发明内容
本发明目的就在于针对上述问题,提出一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法。
本发明解决技术问题采用如下技术方案:一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,其包括:
S10、天然气ECU实时监测采集汽油喷嘴驱动电流波形,并计算出汽油喷嘴驱动信号的脉宽;
S20、根据汽油喷嘴流量特性,汽油喷油压力信息,计算出汽油喷射量;
S30、当发动机工作在汽油燃烧模式时,汽油ECU向汽油喷嘴发出的驱动信号传递给天然气ECU后,天然气ECU不经处理直接发送给汽油喷嘴;当发动机工作在天然气燃烧模式,执行S40至S70;
S40、天然气ECU根据节气门开度信号计算出节气门开度变化率,根据节气门开度变化率绝对值是否大于门限值判断当前是否处于瞬态工况;
S50、在非瞬态工况下,天然气ECU根据发动机转速信号及负荷信号计算出发动机每循环进气量,然后根据目标空燃比以及当前喷油量,计算出当前工况下进气量和喷油量的转换系数,并得到天然气喷射量;
S60、在瞬态工况下,根据去除油膜量之后的汽油净喷油量,得到天然气喷射量;
S70、根据天然气喷射量,天然气喷嘴流量特性,天然气喷射温度,天然气喷射压力信号,以及天然气分压对进气量的修正系数计算出天然气喷嘴的喷射脉宽,并送给天然气喷嘴执行。
可选的,S60具体为:
根据当前发动机每循环进气量及空燃比,以及进气量和净喷油量之间的转换系数,计算出不包含油膜的净喷油量;
根据采集的汽油喷射脉宽计算出包含油膜的汽油总喷射量,然后通过包含油膜的汽油总喷射量减去不包含油膜的净喷油量,得到当前工况下的油膜量;
对所述油膜量滤波;
通过包含油膜的汽油总喷射量减去滤波后的油膜量,得到用于天然气喷射量计算的汽油净喷油量;
根据汽油净喷油量,得到天然气喷射量。
本发明具有如下有益效果:本发明中,由于计算出了瞬态过程中的油膜量,因此通过汽油喷射量计算得到的天然气喷射量可以更好的与当前进气量对应上,使得瞬态过程燃烧空燃比更为可控,减小污染物排放。
附图说明
图1为本发明的汽油天然气两用燃料发动机燃气喷射系统的结构示意图;
具体实施方式
下面结合实施例及附图对本发明的技术方案作进一步阐述。
实施例1
本实施例提供了一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,其通过汽油天然气两用燃料发动机燃气喷射系统实现,所述汽油天然气两用燃料发动机燃气喷射系统包括汽油ECU 1,天然气ECU 2,CAN线3,汽油喷嘴驱动信号线4,汽油喷嘴驱动信号线5,汽油喷嘴6,汽油燃油导轨7,燃气气轨8,燃气温度压力传感器9,天然气喷嘴10,燃气喷射导管11,天然气喷嘴驱动线12和通用诊断线13。
所述汽油ECU1与所述天然气ECU2通过汽油喷嘴驱动信号线4连接,汽油ECU向汽油喷嘴6发出的驱动信号先通过汽油喷嘴驱动信号线4发送至天然气ECU,天然气ECU通过汽油喷嘴驱动信号线5连接汽油喷嘴6。
所述汽油喷嘴6与汽油燃油导轨7连通,以将汽油燃油导轨7中的高压油喷射入气缸或者进气歧管。
天然气喷嘴10经天然气喷嘴驱动线12连接至天然气ECU,接收天然气ECU发出的驱动信号并执行,并通过燃气喷射导管11向各缸进气歧管里喷射适量的天然气。
燃气温度压力传感器9安装于燃气气轨8上,用于以10ms为周期实时采集燃气气轨里燃气温度与压力信号,并将该压力信号传输至所述天然气ECU,用于对汽油喷射脉宽进行修正。
在汽油燃烧模式时,汽油ECU向汽油喷嘴6发出的驱动信号传递给天然气ECU后,天然气ECU不经处理直接发送给汽油喷嘴6,天然气ECU此时的作用就相当于一个传递信号的导线。
在天然气燃烧模式时,汽油ECU向汽油喷嘴6发出的驱动信号传递给天然气ECU后,天然气ECU截断此驱动信号,同时通过硬件电路返回一个模拟汽油喷嘴6响应的电气信号,使汽油ECU不会诊断出汽油喷嘴6的开路电气故障。
天然气ECU通过CAN线3或者通用诊断线13(CAN线3和通用诊断线13不同时存在)以10ms周期获取到汽油ECU发送的发动机转速信号、发动机负荷信号(进气歧管压力信号或空气量信号)、节气门开度信号和目标空燃比,天然气ECU以此计算当前发动机负荷和是否处于瞬态工况。
天然气ECU在截断送往汽油喷嘴6的驱动信号时,通过采集驱动信号的驱动波形,获取当前工况的汽油喷射时间,然后根据天然气与汽油的燃料成分差异,以及其他相关修正,计算出为获得同样缸内燃烧空燃比所需要的天然气的喷射时间,并送给天然气喷嘴10执行。
在稳态工况下,汽油ECU所计算的汽油喷射量是不包含油膜量的,因此便可以计算出进气量和净喷油量之间的转换参数。在天然气模式时的瞬态工况下,先通过发动机进气量计算出不包含油膜的净喷油量,然后用通过汽油喷射脉宽计算得到的包含油膜量的总喷油量减去这个净喷油量,就得到当前瞬态工况下的油膜量,然后对这个油膜量滤波,以模拟油膜的建立和消除过程,最后用包含油膜量的总喷油量减去滤波后的油膜量,得到用于计算天然气喷射量的不包含油膜的喷油量。
其中,所述汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法包括:
S10、天然气ECU实时监测采集汽油喷嘴驱动电流波形,并计算出汽油喷嘴驱动信号的脉宽(以ms计);
S20、根据汽油喷嘴流量特性,汽油喷油压力信息,计算出汽油喷射量(以mg计);
S30、当发动机工作在汽油燃烧模式时,汽油ECU向汽油喷嘴发出的驱动信号传递给天然气ECU后,天然气ECU不经处理直接发送给汽油喷嘴;当发动机工作在天然气燃烧模式,执行S40至S70;
汽油模式下,调整发动机转速和进气压力,使得发动机转速和进气压力覆盖整个发动机运行工况区,其中,转速每次调整间隔为200转/分,进气压力每次调整间隔为100hPa。
待发动机稳定后,根据计算的发动机进气量与汽油喷油量,以及当前空燃比,计算出当前工况下进气量与喷油量之间的转换系数;由于稳态工况下的汽油喷射量不包含油膜量,因此此时计算出的转换系数就能反应进气量与净喷油量之间的对应关系。
S40、天然气ECU根据通过CAN线或通用诊断线获取的节气门开度信号以10ms周期计算出节气门开度变化率,根据节气门开度变化率绝对值是否大于门限值判断当前是否处于瞬态工况,即当节气门开度变化率绝对值大于门限值,判定发动机当前处于瞬态工况,否则,则判定发动机当前处于非瞬态工况(稳态工况);
S50、在非瞬态工况(稳态工况)下,天然气ECU根据发动机转速信号及负荷信号(进气歧管压力或空气流量)以10ms周期计算出发动机每循环进气量,然后根据目标空燃比以及当前喷油量,计算出当前工况下进气量和喷油量的转换系数,由于稳态工况下的汽油喷油量是不包含油膜的,因此得到的这个转换系数反应的就是进气量和净喷油量之间的对应关系。
S60、在瞬态工况下,以10ms任务周期,根据当前发动机每循环进气量及空燃比,以及进气量和净喷油量之间的转换系数,计算出不包含油膜的净喷油量(以mg计),根据采集的汽油喷射脉宽计算出包含油膜的汽油总喷射量,然后用包含油膜的汽油总喷射量减去不包含油膜的净喷油量,得到当前工况下的油膜量(以mg计);然后用一个滤波函数对所述油膜量滤波,以模拟油膜的建立和消除过程;用包含油膜的汽油喷射量减去滤波后的油膜量,得到用于天然气喷射量计算的汽油净喷油量(以mg计)。
S70、根据天然气喷射量,天然气喷嘴流量特性,天然气喷射温度,天然气喷射压力信号,以及天然气分压对进气量的修正系数(约0.9)计算出天然气喷嘴的喷射脉宽(以ms计),并送给天然气喷嘴执行。
根据S60计算出的汽油净喷油量,结合汽油和天然气的空燃比转换参数,以及当前工况的目标空燃比,计算出当前工况下所需要的天然气喷射量;
根据天然气燃气喷射压力,燃气温度,天然气喷嘴流量特性,以及天然气分压信息,结合所计算的天然气喷射量,计算出所需要的天然气喷射脉宽。
以上实施例的先后顺序仅为便于描述,不代表实施例的优劣。
最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。
Claims (1)
1.一种汽油天然气两用燃料发动机瞬态过程中天然气喷射脉宽的计算方法,其特征在于,包括:
S10、天然气ECU实时监测采集汽油喷嘴驱动电流波形,并计算出汽油喷嘴驱动信号的脉宽;
S20、根据汽油喷嘴流量特性和汽油喷油压力信息,计算出汽油喷射量;
S30、当发动机工作在汽油燃烧模式时,汽油ECU向汽油喷嘴发出的驱动信号传递给天然气ECU后,天然气ECU不经处理直接发送给汽油喷嘴;当发动机工作在天然气燃烧模式,执行S40至S70;
S40、天然气ECU根据节气门开度信号计算出节气门开度变化率,根据节气门开度变化率绝对值是否大于门限值判断当前是否处于瞬态工况;
S50、在非瞬态工况下,天然气ECU根据发动机转速信号及负荷信号计算出发动机每循环进气量,然后根据目标空燃比以及当前喷油量,计算出当前工况下进气量和喷油量的转换系数,并得到天然气喷射量;
S60、在瞬态工况下,根据去除油膜量之后的汽油净喷油量,得到天然气喷射量;
S70、根据天然气喷射量、天然气喷嘴流量特性、天然气喷射温度、天然气喷射压力信号,以及天然气分压对进气量的修正系数计算出天然气喷嘴的喷射脉宽,并发送给天然气喷嘴执行;
其中,S60具体为:
根据当前发动机每循环进气量及空燃比,以及进气量和净喷油量之间的转换系数,计算出不包含油膜的净喷油量;
根据采集的汽油喷射脉宽计算出包含油膜的汽油总喷射量,然后通过包含油膜的汽油总喷射量减去不包含油膜的净喷油量,得到当前工况下的油膜量;
对所述油膜量滤波;
通过包含油膜的汽油总喷射量减去滤波后的油膜量,得到用于天然气喷射量计算的汽油净喷油量;
根据汽油净喷油量,得到天然气喷射量。
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