CN103161570A - 具有无结垢egr系统的柴油-汽油双燃料动力内燃机系统 - Google Patents

具有无结垢egr系统的柴油-汽油双燃料动力内燃机系统 Download PDF

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CN103161570A
CN103161570A CN2012105444175A CN201210544417A CN103161570A CN 103161570 A CN103161570 A CN 103161570A CN 2012105444175 A CN2012105444175 A CN 2012105444175A CN 201210544417 A CN201210544417 A CN 201210544417A CN 103161570 A CN103161570 A CN 103161570A
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崔坮
丁玹声
奇旼莹
李兴雨
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Hyundai Motor Co
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Abstract

本发明提供了一种具有无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中汽油和空气被均匀结合并供应至汽缸，然后柴油燃料被喷射并在一起燃烧。所述系统可以包括：多个汽缸和排放管路，所述多个汽缸各自具有燃料喷射器，并且随着每个汽缸的燃料燃料，排出的排放气体流动通过所述排放管路；其中汽油燃料燃烧类型适用于所述多个汽缸中的一个或多个汽缸，并且柴油-汽油燃料预混合燃烧类型适用于其它汽缸。

Description

具有无结垢EGR系统的柴油-汽油双燃料动力内燃机系统
相关申请的交叉引用
本申请要求2011年12月16日提交的韩国专利申请第10-2011-0136614号的优先权，该申请的全部内容结合于此用于通过该引用的所有目的。
技术领域
本发明涉及一种具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力的内燃机系统，特别地涉及一种汽油和柴油燃料结合的均质充量压缩点火发动机的排放气体再生控制系统及其方法，其有可能以控制汽油和柴油燃料结合的HCCI发动机的点火正时的方式来抑制在EGR系统中所产生的沉淀物的产生。
背景技术
排放气体再循环（EGR）系统广泛安装于车辆中，从而以使来自发动机的排放气体再循环并引入汽缸内部中的方式来减少NOx。提供如上所述EGR系统以满足发动机的排放气体规定。
将描述适于柴油燃料发动机的EGR系统。由于排放气体再循环并引入汽缸，因此在EGR系统发生由颗粒物质（PM）所导致的问题，所述颗粒物质包括可溶性有机馏分（SOF）和烟灰。这种问题会导致性能、燃料效率和排放特性劣化。
另外，作为有效处理加强的规定和高的燃料效率需求的方式之一，推荐的是采用并结合柴油燃料发动机和汽油燃料发动机的优点。
作为特定方式之一，存在一种柴油-汽油双燃料动力的内燃机，其能够减少NOx，并实现等同于柴油发动机的燃料里程的高燃料里程。
然而，对于具有EGR系统的柴油-汽油双燃料动力的内燃机，不能有效减少结垢。
因此，如上所述的方式不能减少颗粒物质（从而会产生结垢）。
因此，需要通过用汽油燃烧代替柴油-汽油双燃料动力燃烧来防止颗粒物质被包含于EGR气体再循环中。
公开于该背景技术部分的信息仅仅旨在加深对本发明的一般背景技术的理解，而不应当被视为承认或以任何形式暗示该信息构成已为本领域技术人员所公知的现有技术。
发明内容
因此，本发明致力于解决在常规技术中遇到的问题。本发明的各个方面提供了一种具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力的内燃机系统，其可以以控制汽油和柴油双燃料动力的内燃机的点火方法的方式来抑制在EGR系统中颗粒物质的产生。
本发明的各个方面提供了一种具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中汽油和空气被均匀结合并喷射至汽缸，然后柴油燃料被喷射并在一起燃烧，所述内燃机系统包括多个汽缸和排放管路，所述多个汽缸各自具有燃料喷射器，并且随着每个汽缸的燃料燃烧，排出的排放气体流动通过所述排放管路，其中汽油燃料燃烧类型适用于所述多个汽缸中的一个或多个汽缸，并且柴油-汽油燃料预混合燃烧类型适用于其它汽缸。
另外，火花塞可以不安装于所述多个汽缸。
另外，其中安装火花塞的汽缸可以配置为燃烧汽油，其它汽缸配置为燃烧汽油和柴油燃料的混合物。
另外，仅有来自其中可以安装火花塞的汽缸的排放气体流动通过EGR管路。
另外，旁路阀安装于所述EGR管路的中间部分，并且所述旁路阀配置为选择性地将来自其中可以安装火花塞的汽缸的排放气体排出至涡轮侧或后处理装置。
根据具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统的EGR控制系统，有可能分别有效控制在点燃预混合的双燃料的汽缸中和点燃汽油的汽缸中的点火正时，从而降低在EGR系统中积聚的颗粒物质。因此，可以提高EGR系统的操作性能。
通过纳入本文的附图以及随后与附图一起用于说明本发明的某些原理的具体实施方式，本发明的方法和装置所具有的其它特征和优点将更为具体地变得清楚或得以阐明。
附图说明
图1为根据本发明的具有火花助燃无结垢EGR系统的示例性的柴油-汽油双燃料动力内燃机系统的示意图。
图2为示出了根据本发明的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统的示例性EGR控制系统的示意图。
具体实施方式
下面将对本发明的各个实施方式详细地作出引用，这些实施方式的实例被显示在附图中并描述如下。尽管本发明将与示例性实施方式相结合进行描述，但是应当意识到，本说明书并非旨在将本发明限制为那些示例性实施方式。相反，本发明旨在不但覆盖这些示例性实施方式，而且覆盖可以被包括在由所附权利要求所限定的本发明的精神和范围之内的各种选择形式、修改形式、等价形式及其它实施方式。
如图1所示，根据本发明的第一示例性实施方式的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统包括多个汽缸101、102、103和104，来自汽缸101、102、103和104的排放气体沿着排放管路200流动，由此驱动涡轮300。由于压缩机400安装在与涡轮300旋转相同的轴线上，因此在吸入管路220中发生增压压力（boostpressure）。在此时，在汽缸101、102、103和104中，第四汽缸104与EGR管路210连通，从而使得EGR气体可供应至吸入管路220。另外，旁路阀210a设置于EGR管路210上，由此控制EGR速率。
同时，图2为示出了根据本发明的第二示例性实施方式的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统的EGR控制系统的示意图。如其中所示，根据本发明的实施方式的汽油和柴油燃料结合的HCCI发动机的EGR控制系统包括多个汽缸101、102、103和104，排放管路200，涡轮300和压缩机400，所述多个汽缸101、102、103和104各自配备燃料喷射器，来自汽缸101、102、103和104的燃料通过所述排放管路200燃烧并耗尽，所述涡轮300通过从所述排放管路提供的排放气体而旋转，所述压缩机400与涡轮300一起旋转，并将压缩的排放气体供应至EGR冷却器230。在此处，多个汽缸101、102、103和104中的一个形成EGR气体供应汽缸，在所述EGR气体供应汽缸中安装火花塞104a。换言之，EGR气体供应汽缸104属于通过燃烧汽油燃料来产生驱动力的汽油发动机。
另外，EGR气体供应汽缸104与用于供应EGR气体的EGR管路210连接。
在本发明的本实施方式中采用4缸发动机，但也可以采用具有超过4个汽缸的发动机。作为一个例子，如图2所示，当采用由第一汽缸101、第二汽缸102、第三汽缸103和第四汽缸104形成的4缸发动机时，第一汽缸101、第二汽缸102和第三汽缸103配置为属于柴油和汽油燃料结合点火式发动机，第四汽缸104配置为属于汽油发动机。
在进气冲程时或在进气冲程过程中，之前通过端口喷射的汽油燃料和空气以及EGR气体以混合在一起的状态被供应至第一汽缸101、第二汽缸102和第三汽缸103。在活塞的压缩冲程过程中，柴油燃料经由燃料喷射器101a、102a和103a喷射。在此时，柴油燃料用作均匀分布于汽缸中的预混合柴油-汽油燃料的点火源，从而使火焰传播至结合的气体，进而产生驱动力。
第一汽缸101、第二汽缸102和第三汽缸103配置为属于燃料结合点火式发动机，以确保可以使用无烟燃烧特性（所述无烟燃烧特性为混合燃烧的特征），第四汽缸104配置为属于汽油发动机，因此当第四汽缸104被驱动时，火焰点火可以通过火花塞104a进行。
连接EGR管路210，使得来自第四汽缸104的部分排放气体可被再循环。从四个汽缸101、102、103和104选择一个汽缸来作为EGR气体供应专用汽缸，从而使得在产生驱动力之后排出的排放气体可用作EGR气体。优选的是剩余的汽缸配置为在产生驱动力之后进行排气操作。
旁路阀210a和210b安装于EGR管路210的中间部分处。旁路阀210a和210b安装在两个位置，因此部分排放气体可以被供应至涡轮300侧，或者可以被供应至后处理装置。通过控制旁路阀210a和210b的打开比例，来自第四汽缸104的排放气体可以唯一用于EGR或者仅部分用于EGR，因此可以简化HCCI发动机EGR系统。
根据本发明的第二示例性实施方式的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统意在通过控制第四汽缸104的火花塞104a的操作的正时来调节点火的正时，并意在将属于汽油发动机的第四汽缸104的排放气体供应至EGR管路210，因此可以通过第一汽缸101、第二汽缸102和第三汽缸103的预混燃烧而使在EGR管路210和EGR冷却器230处积聚的颗粒物质达到最少。
为了方便解释和精确限定所附权利要求，术语上或下，前或后，内或外等被用于参考附图中所显示的这些特征的位置来描述示例性实施方式的特征。
前面对本发明具体示例性实施方式所呈现的描述是出于说明和描述的目的。前面的描述并不想要成为毫无遗漏的，也不是想要把本发明限制为所公开的精确形式，显然，根据上述教导很多改变和变化都是可能的。选择示例性实施方式并进行描述是为了解释本发明的特定原理及其实际应用，从而使得本领域的其它技术人员能够实现并利用本发明的各种示例性实施方式及其不同选择形式和修改形式。本发明的范围意在由所附权利要求书及其等价形式所限定。

Claims (5)

1.一种具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中汽油和空气被均匀结合并供应至汽缸，然后柴油燃料被喷射并在一起燃烧，所述内燃机系统包括：
多个汽缸，所述多个汽缸各自具有燃料喷射器；和
排放管路，随着每个汽缸的燃料燃烧，排出的排放气体流动通过所述排放管路；
其中汽油燃料燃烧适用于所述多个汽缸中的一个或多个，并且柴油-汽油燃料预混合燃烧类型适用于其它汽缸。
2.根据权利要求1所述的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中火花塞未安装于所述多个汽缸。
3.根据权利要求2所述的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中安装火花塞的汽缸配置为燃烧汽油，其它汽缸配置为燃烧汽油和柴油燃料的混合物。
4.根据权利要求3所述的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中仅有来自其中安装火花塞的汽缸的排放气体流动通过EGR管路。
5.根据权利要求4所述的具有火花助燃无结垢EGR系统的柴油-汽油双燃料动力内燃机系统，其中旁路阀安装于所述EGR管路的中间部分，并且所述旁路阀配置为选择性地将来自其中安装火花塞的汽缸的排放气体排出至涡轮侧或后处理装置。
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