CN115045780A - 一种增加低压egr覆盖工况布置结构 - Google Patents
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Abstract
一种增加低压EGR覆盖工况布置结构,属于汽车发动机技术领域。用于解决低压EGR所能应用的转速和负荷工况范围局限的问题。包括依次连通的三元催化器、EGR冷却器、EGR阀和EGR连接管、进气管及增压器;并在所述进气管前端增加混合阀,燃烧后废气经过三元催化器、EGR冷却器、EGR阀、EGR连接管与从混合阀流入的新鲜空气在进气管会合一同流入增压器进行压缩增大压力,通过调节混合阀的开度制造负压增大EGR管路压力差。本发明涡轮后端取气,不会损失涡轮效率;可有效提升涡轮增压器工作效率。通过调节阀口开度制造负压,增大EGR气体流量,特殊进气管路设计,提高EGR气体充气效率,可实现低压EGR覆盖全转速和多种负荷工况。
Description
技术领域
本发明属于汽车发动机技术领域,具体涉及一种增加低压EGR覆盖工况布置结构。
背景技术
EGR系统是降低NOX的排放、降低油耗的有效手段,增压发动机EGR系统根据取气位置分为高压EGR(涡轮前取气)、低压EGR(涡轮后取气),低压EGR改善油耗效果更优,但是低压EGR取气位置的原因,与进气系统间的压差相对更小,所能应用的转速和负荷工况范围更加局限。
发明内容
本发明为了解决低压EGR所能应用的转速和负荷工况范围局限的问题,进而提供一种增加低压EGR覆盖工况布置结构,该结构使EGR系统涡轮后端取气,涡轮效率没有损失。
本发明所采取的技术方案是:一种增加低压EGR覆盖工况布置结构,包括依次连通的三元催化器、EGR冷却器、EGR阀和EGR连接管、进气管及增压器;并在所述进气管前端增加混合阀,燃烧后废气经过三元催化器、EGR冷却器、EGR阀、EGR连接管与从混合阀流入的新鲜空气在进气管会合一同流入增压器进行压缩增大压力,通过调节混合阀的开度制造负压增大EGR管路压力差。
本发明与现有技术相比具有以下有益效果:
本发明涡轮后端取气,不会损失涡轮效率;废气流入增压器的压轮,提升其响应速率,可有效提升涡轮增压器工作效率。在低压EGR系统中增加混合阀,通过调节阀口开度制造负压,增大EGR气体流量,特殊进气管路设计,提高EGR气体充气效率,可实现低压EGR覆盖全转速和多种负荷工况,达到更好的节油减排效果。温度传感器、压差传感器、混合阀、特殊进气管路的组合使用,实现精准控制,增加EGR率,降低缸内温度,抑制爆震,利于增大点火角和压比,提高燃烧效率。且三元后端取气,有效降低对冷却器和EGR阀的污染。
附图说明
图1是本发明结构示意图;
图2是本发明进气管结构示意图;
图3是本发明进气管侧视图;
图4是本发明塑料硬管二特殊形状流道;
图5是本发明高压EGR map图;
图6是本发明低压EGR map图;
其中:1、三元催化器;2、EGR冷却器;3、EGR阀;4、EGR连接管;5、混合阀;6、进气管;7、增压器;61、法兰盘一;62、进气口;63、线束支架一;64、安装点一;65、线束支架二;66、油气脱附管咀;67、卡箍;68、TPV胶管;69、安装点二;610、法兰盘二;611、安装点三;612、安装点四;613、油气脱附管咀;614、塑料硬管二;615、塑料硬管一。
具体实施方式
为了更好地了解本发明的目的、结构及功能,下面结合附图,对本发明的做进一步详细的描述。
参照图1~图4所示,本发明的一种增加低压EGR覆盖工况布置结构,包括依次连通的三元催化器1、EGR冷却器2、EGR阀3和EGR连接管4、进气管6及增压器7;并在进气管6前端增加混合阀5,燃烧后废气经过三元催化器1、EGR冷却器2、EGR阀3、EGR连接管4与从混合阀5流入的新鲜空气在进气管6会合一同流入增压器7进行压缩增大压力,最后经过其他进气管路流入气缸盖燃烧室燃烧,通过调节混合阀5的开度制造负压增大EGR管路压力差。进气管6内的气流流通,突然开合混合阀5,混合阀5两侧会产生压力差,从而制造负压。
低压EGR气体从三元催化器1到进气管6通道两端压差低,部分工况压差小于5kPa,无EGR作用。低压EGR气体从三元催化器1到进气管6通道两端压差低,部分工况压差小于5kPa,无EGR作用。本发明在进气管6前端增加混合阀5,新鲜空气经过空气滤后流入混合阀5,通过调节混合阀5的阀体开度制造负压,增大EGR管路压力差,保证EGR流量满足需求。同时,为了精准控制EGR流量,在进气管6进气口6-2位置增加压差传感器9和EGR冷却器上增加EGR温度传感器8,ECU通过压差传感器9测得的压力差、温度传感器8测得的温度、混合阀5翻板开度计算废气流量。
其中:进气管6包括用两个卡箍67依次串接的塑料硬管一615、TPV胶管68和塑料硬管二614;塑料硬管一615前端设置用于连接混合阀5的法兰盘一61,塑料硬管二614后端设置用于连接增压器7的法兰盘二610,在塑料硬管一615在进气口62处设置传感器安装台,在塑料硬管一615靠近TPV胶管68处设置油气脱附管咀66用于与EGR连接管4连接,塑料硬管二614上设置油气脱附管咀613。
TPV胶管68采用波纹管,增强容差能力,同时规避混合阀5突然关闭时压力突变导致胶管被吸瘪的风险。
油气脱附管咀66与气流流入方向的夹角α为50~55°。优选为54°。使新鲜空气与废气夹角小于90度,是两股气流不会对冲,废气会顺着新鲜空气流动方向,推着废气进增压器7。
塑料硬管一615上设置安装点一64、塑料硬管二614上设置安装点二69,法兰盘一61上设置安装点三611和安装点四612,管路无外置支架,通过四个安装点在发动机上固定及支撑管体6和混合阀5,安装点一64和安装点三611采用长圆孔设计增强容差能力,塑料硬管一615上设置线束支架一63和线束支架二65。
塑料硬管二614采用NACA变形技术,形成特殊形状流道,能够在管路截面积不变的前提下,增大管路转弯半径,降低管路气体流通阻力,提高EGR气体充气效率。
根据某车厂提供的7个工况点及发动机已有数据,分别计算高压EGR及低压EGR压差情况,绘制图5应用高压EGR map图及图6应用低压EGR map图。
转速/rpm | 功率/kW | 缸内平均有效压力/bar |
1250±200 | 10 | 6.4 |
2000±200 | 20 | 8.0 |
2500±200 | 30 | 9.6 |
3000±200 | 40 | 10.7 |
3600±200 | 50 | 11.1 |
3800±200 | 60 | 12.6 |
4000±200 | 70 | 14.0 |
从map图5和图6中可以看出,使用高压EGR仅有4个点落在压差小于5kPa区域,改用低压EGR后,7个点均落在压差小于5kPa区域,较高压EGR有明显改善。充分证明本发明的布置方案能覆盖全转速和多种负荷工况。
可以理解,本发明是通过一些实施例进行描述的,本领域技术人员知悉的,在不脱离本发明的精神和范围的情况下,可以对这些特征和实施例进行各种改变或等效替换。另外,在本发明的教导下,可以对这些特征和实施例进行修改以适应具体的情况及材料而不会脱离本发明的精神和范围。因此,本发明不受此处所公开的具体实施例的限制,所有落入本申请的权利要求范围内的实施例都属于本发明所保护的范围内。
Claims (7)
1.一种增加低压EGR覆盖工况布置结构,其特征在于:包括依次连通的三元催化器(1)、EGR冷却器(2)、EGR阀(3)和EGR连接管(4)、进气管(6)及增压器(7);并在所述进气管(6)前端增加混合阀(5),燃烧后废气经过三元催化器(1)、EGR冷却器(2)、EGR阀(3)、EGR连接管(4)与从混合阀(5)流入的新鲜空气在进气管(6)会合一同流入增压器(7)进行压缩增大压力,通过调节混合阀(5)的开度制造负压,增大EGR管路压力差。
2.根据权利要求1所述的一种增加低压EGR覆盖工况布置结构,其特征在于:所述进气管(6)包括用两个卡箍(67)依次串接的塑料硬管一(615)、TPV胶管(68)和塑料硬管二(614);所述塑料硬管一(615)前端设置用于连接混合阀(5)的法兰盘一(61),所述塑料硬管二(614)后端设置用于连接增压器(7)的法兰盘二(610),在所述塑料硬管一(615)在进气口(62)处设置传感器安装台,在塑料硬管一(615)靠近TPV胶管(68)处设置油气脱附管咀(66)用于与EGR连接管(4)连接,塑料硬管二(614)上设置油气脱附管咀(613)。
3.根据权利要求2所述的一种增加低压EGR覆盖工况布置结构,其特征在于:所述TPV胶管(68)采用波纹管,增强容差能力。
4.根据权利要求3所述的一种增加低压EGR覆盖工况布置结构,其特征在于:所述油气脱附管咀(66)与气流流入方向的夹角α为50~55°。
5.根据权利要求4所述的一种增加低压EGR覆盖工况布置结构,其特征在于:所述塑料硬管一(615)上设置安装点一(64)、塑料硬管二(614)上设置安装点二(69),所述法兰盘一(61)上设置安装点三(611)和安装点四(612),通过四个安装点在发动机上固定及支撑管体(6)和混合阀(5),所述安装点一(64)和安装点三(611)采用长圆孔设计增强容差能力,所述塑料硬管一(615)上设置线束支架一(63)和线束支架二(65)。
6.根据权利要求5所述的一种增加低压EGR覆盖工况布置结构,其特征在于:所述塑料硬管二(614)采用NACA变形技术,能够增大管路转弯半径。
7.根据权利要求5所述的一种增加低压EGR覆盖工况布置结构,其特征在于:在进气管(6)的传感器安装台上安装压差传感器(9),在EGR冷却器(2)上设置EGR温度传感器(8)。
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