CN103912345B - 混合动力电动车辆颗粒再生方法和系统 - Google Patents
混合动力电动车辆颗粒再生方法和系统 Download PDFInfo
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Abstract
一种方法应用于再生混合动力电动车辆的颗粒过滤器中的颗粒物质,所述车辆具有内燃发动机和电动马达的组合,用于推进车辆,所述混合动力电动车辆具有设置成与车辆的排气系统中的颗粒过滤器流动连通的电加热催化剂。所述方法确定内燃发动机是否燃烧燃料,且在内燃发动机不燃烧燃料的情况下,电加热所述催化剂,直到其达到适合于引起颗粒物质点火的温度。电动马达用于利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过催化剂进入颗粒过滤器,以利于过滤器中的颗粒点火。
Description
技术领域
本发明涉及混合动力电动车辆(HEV),且更具体地涉及用于HEV或插电式混合动力电动车辆(PHEV)的颗粒再生方法和系统。
背景技术
PHEV在电荷消耗操作模式期间可能具有显著的发动机关闭操作时段,从而形成发动机可能多次冷起动的情况,这潜在地增加颗粒物质(PM)的形成和排放。
因此,期望提供用于收集和再生PM的方法和系统,以避免增加HEV和PHEV中的PM排放。
发明内容
在本发明的一个示例性实施例中,一种方法应用于再生混合动力电动车辆(HEV)的颗粒过滤器(PF)中的颗粒物质(PM),所述HEV具有内燃发动机和电动马达的组合,用于推进HEV,所述HEV具有设置成与HEV的排气系统中的PF流动连通的电加热催化剂(EHC)。所述方法确定内燃发动机是否燃烧燃料,且在内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度。电动马达用于利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
在本发明的另一个示例性实施例中,一种颗粒再生系统配置用于混合动力电动车辆(HEV),所述HEV具有内燃发动机和电动马达的组合,用于推进HEV。电加热催化剂(EHC)设置成与内燃发动机的排气系统成排气流动连通。颗粒过滤器(PF)设置成与EHC成排气流动连通且在EHC的下游。控制器操作性地设置成与内燃发动机的控制系统、电动马达的控制系统、EHC的控制系统和PF的控制系统成信号连通,所述控制器响应于计算机可执行指令,在由控制器执行时,利于再生PF中的颗粒物质(PM)的方法。所述方法确定内燃发动机是否燃烧燃料;且在内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度;使用电动马达以利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
方案1. 一种用于再生混合动力电动车辆(HEV)的颗粒过滤器(PF)中的颗粒物质(PM)的方法,所述HEV具有内燃发动机和电动马达的组合,用于推进HEV,所述HEV具有设置成与HEV的排气系统中的PF成流动连通的电加热催化剂(EHC),所述方法包括:
确定内燃发动机是否燃烧燃料;
在内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度;以及使用电动马达以利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
方案2. 根据方案1所述的方法,还包括:
在PF中的PM处于点火下的情况下,监测表示PF中的PM温度的温度;以及使用电动马达以在PM温度指示比阈值更高或更低时分别升高或降低内燃发动机的旋转速度。
方案3. 根据方案2所述的方法,还包括:
确定PF的再生是否完成;以及如果是,那么停止内燃发动机的旋转以停止通过排气系统的进一步空气流。
方案4. 根据方案1所述的方法,还包括:
在EHC达到适合于利于PF中的PM点火的温度之后,关闭EHC。
方案5. 根据方案1所述的方法,其中:
HEV在没有来自于内燃发动机的排气流的情况下由电动马达推进。
方案6. 根据方案3所述的方法,其中:
如果确定PF的再生未完成,那么继续监测PM温度,且响应于PM温度指示比阈值更高还是更低而分别升高和降低内燃发动机的旋转速度。
方案7. 根据方案1所述的方法,还包括:
在内燃发动机燃烧燃料的情况下,将内燃发动机的空气-燃料比设定为大约等于与内燃发动机有关的化学计量比,使得由内燃发动机使用以燃烧燃料的所有氧气都被消耗。
方案8. 根据方案7所述的方法,还包括:
监测表示PF中的PM温度的温度;
如果PM温度指示比阈值更高,那么继续将空气-燃料比设定为等于化学计量比;
如果PM温度指示比阈值更低,那么停止将空气-燃料比设定为等于化学计量比。
方案9. 根据方案1所述的方法,还包括:
监测颗粒过滤器的状态,以确定颗粒过滤器是否需要再生;
如果确定颗粒过滤器不需要再生,那么继续监测颗粒过滤器的状态,直到其需要再生或者直到监测以其他方式中断。
方案10. 一种用于混合动力电动车辆(HEV)的颗粒再生系统,所述HEV具有内燃发动机和电动马达的组合,用于推进HEV,所述系统包括:
电加热催化剂(EHC),设置成与内燃发动机的排气系统成排气流动连通;
颗粒过滤器(PF),设置成与EHC成排气流动连通且在EHC的下游;
控制器,操作性地设置成与内燃发动机的控制系统、电动马达的控制系统、EHC的控制系统和PF的控制系统成信号连通,所述控制器响应于计算机可执行指令,在由控制器执行时,所述计算机可执行指令利于再生PF中的颗粒物质(PM)的方法,所述方法包括:
确定内燃发动机是否燃烧燃料;
在内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度;以及使用电动马达以利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
方案11. 根据方案10所述的颗粒再生系统,其中,由控制器利于的方法还包括:
在PF中的PM处于点火下的情况下,监测表示PF中的PM温度的温度;以及使用电动马达以在PM温度指示比阈值更高或更低时分别升高或降低内燃发动机的旋转速度。
方案12. 根据方案11所述的颗粒再生系统,其中,由控制器利于的方法还包括:
确定PF的再生是否完成;以及如果是,那么停止内燃发动机的旋转以停止通过排气系统的进一步空气流。
方案13. 根据方案12所述的颗粒再生系统,其中,由控制器利于的方法还包括:
如果确定PF的再生未完成,那么继续监测PM温度,且响应于PM温度指示比阈值更高还是更低而分别升高和降低内燃发动机的旋转速度。
方案14. 根据方案10所述的颗粒再生系统,其中,由控制器利于的方法还包括:
在内燃发动机燃烧燃料的情况下,将内燃发动机的空气-燃料比设定为大约等于与内燃发动机有关的化学计量比,使得由内燃发动机使用以燃烧燃料的所有氧气都被消耗。
方案15. 根据方案14所述的颗粒再生系统,其中,由控制器利于的方法还包括:
监测表示PF中的PM温度的温度;
如果PM温度指示比阈值更高,那么继续将空气-燃料比设定为等于化学计量比;
如果PM温度指示比阈值更低,那么停止将空气-燃料比设定为等于化学计量比。
本发明的上述特征和优点以及其它特征和优点将通过下面结合附图对本发明的详细描述而变得显而易见。
附图说明
在下面对实施例的详细描述中,仅通过示例来呈现其它特征、优点和细节,所述详细描述参阅附图进行,在附图中:
图1以单线框图形式示出了根据本发明实施例的用于混合动力电动车辆(HEV)或插电式混合动力电动车辆(PHEV)的示例性颗粒再生系统;
图2示出了根据本发明实施例使用的示例性颗粒过滤器(PF);和
图3示出了根据本发明实施例的用于再生HEV或PHEV中的PF的示例性方法。
具体实施方式
下面的描述本质上仅是示例性的,并非旨在限制本公开、其应用或使用。应当理解的是,贯穿附图,对应的附图标记表示类似或对应的部件和特征。
根据涉及HEV或PHEV(具有电动马达(EM)和内燃发动机(ICE)两者)的本发明的示例性实施例,本文所述的控制方案和系统利用电加热催化剂(EHC)和颗粒过滤器(PF)的操作特性以启动收集在PF中的颗粒物质(PM)的再生,且利用未供应燃料(unfueled)的ICE的操作特性以提供空气流来控制PM再生温度,其中,PM变为给PF再生过程提供动力的燃料,且来自于ICE的未供应燃料的空气流变为PF再生过程中的控制元件。
根据本发明的示例性实施例,且参考图1,以单线框图的形式示出了用于HEV或PHEV的颗粒再生系统100。如本文使用的且根据本发明的实施例,参考HEV旨在涵盖HEV和PHEV两者。这就是说,由于HEV与PHEV相比通常不具有长的发动机关闭时间,因为HEV具有相对较小的蓄电池,因此,与HEV相比,本文公开的本发明实施例更可应用于PHEV。然而,由于PHEV是HEV(插电式与非插电式)的特定形式,前文参考术语HEV旨在涵盖HEV和PHEV两者仍然适用。典型HEV,仅由附图标记10部分地示出,包括ICE 102和由蓄电池组106供电的EM 104两者,例如,蓄电池组106适当地定尺寸以提供足够的DC功率来在期望距离内操作EM 104。在实施例中,蓄电池组106提供250-400 Vdc范围内的DC电压和8-80 KW-hrs(千瓦-小时)范围内的DC功率。
排气歧管108将排气从ICE 102引导到再生系统100,在实施例中,包括EHC 110、PF 112和控制器200。适合于本文公开目的的示例性EHC是可从NGK Insulators, Ltd.获得的挤压成型EHC,具有设置在挤压模型的相对表面上的正电极和负电极。适合于本文公开目的的示例性PF在US专利No. 7524360中描述。EHC 110设置成与排气歧管108成排气流动连通,PF 112设置成与EHC 110成排气流动连通且在EHC 110的下游。在实施例中,三效催化剂(TWC)114可以任选地设置成与PF 112成排气流动连通且在PF 112的上游。
控制器200操作性地设置成与ICE 102的控制系统202、EM 104的控制系统204、EHC 110的控制系统和PF 112的控制系统成信号连通。在实施例中,控制系统202是电子控制模块,其监测ICE 102的操作特性,例如燃料消耗和发动机RPM(转每分),且给ICE 102提供管理控制,例如控制用于燃烧的燃料-空气比。在实施例中,控制系统204是电子控制模块,其监测EM 104的操作特性,例如功率消耗和扭矩输出,且给EM 104提供管理控制,例如控制用于产生扭矩的功率。在实施例中,控制系统202和204可以整体形成为单个电子控制模块。在实施例中,EHC 110的控制系统包括设置在EHC 110上游的排气流中的氧气传感器(O1)205、以及开关206,开关206设置和配置成连接和断开从蓄电池组106到EHC 110的功率。在实施例中,PF 112的控制系统包括设置在EHC 110下游和PF 112上游的排气流中的氧气传感器(O2)208、设置在EHC 110下游和PF 112上游的排气流中的入口温度传感器(T1)210、设置在PF 112下游的排气流中的出口温度传感器(T2)212、以及跨过PF 112的入口和出口端口的差压力传感器(P1,P2)214,216。参考图1和2,温度传感器(T1,T2)210,212近距离联接到PF 112的相应入口和出口端口118,120,从而在PF 112内处于点火下的颗粒物质(PM)116(参考图2最佳地可见)的温度可以直接或间接地确定,例如通过推导。在图2所示的实施例中,PM 116的点火首先在入口端口118处发生,且朝向出口端口120附近的捕获PM 116'传播。进入和通过PM 112的排气流在图2中由附图标记250(进入PF 112的排气流)、252(预先过滤的排气流)和254(过滤的排气流)总体上示出。
在实施例中,控制器200响应于计算机可执行指令,在由控制器200执行时,计算机可执行指令利于再生PF 112内的PM 116的方法,现在参考图3讨论,图3示出了示例性控制流程图(方法)300。
流程图300的框302代表混合动力PM再生连续循环的起始点,其中,本发明的实施例以连续循环运行所示过程,以利于HEV 10的PF 112内的PM 116的连续再生。在实施例中,方法300连续地循环,除非以其他方式中断,例如在HEV 10关闭和未使用时。
在框304,确定PF 112是否需要再生,例如过滤器是充满(PF充满)还是没有(PF未充满)。如果确定PF 112不需要再生,那么方法300在路径330上继续且循环到框302,以继续监测PF 112的状态,直到其需要再生或者直到监测以其他方式中断。确定PF 112是否需要再生的这种监测可以使用多种技术完成。第一种技术使用跨过PF 112的入口和出口端口的差压力传感器(P1,P2)214,216,以估计PM负载,高压力差表示需要再生。第二种技术使用PM模型来估计PM负载。第三种技术使用里程来估计PM负载,自上一次再生以来的里程差大于限定阈值表示需要再生。可以采用用于确定需要再生的任何合适技术或技术组合。所述三种技术可以一起使用,其中,PF 112的再生将取决于任何一种技术横穿限定标定阈值而触发。
如果在框304确定PF 112需要再生,那么方法300在路径332上继续框306,其中,确定ICE 102是否运行且燃烧燃料。在实施例中,控制系统202提供与ICE 102操作状态有关的所需信息。在ICE 102不燃烧燃料的情况下,方法300的控制逻辑经由路径334转到框308,其中,控制器200使得开关206打开,即闭合或致动,以将EHC 110电连接到蓄电池组106,以电加热EHC 110,直到其达到适合于引起PF 112中的PM 116点火的温度。在实施例中,PM 116的点火温度是700摄氏度。在框310,控制器200经由从温度传感器210接收的信息来确定EHC 110是否达到点火温度。如果否,那么方法300的控制逻辑经由路径336循环回到框308。当PM 116的温度充分地升高以便点火时,方法300的逻辑经由逻辑338转到框312,其中,控制器200与控制系统204通信以操作EM 104,以利于ICE 102以适合于将空气抽吸到ICE 102中且从ICE 102排出、经过EHC 110进入PF 112的旋转速度旋转,以利于PF 112中的PM 116的持续点火,且关闭(即断开或停用)开关206,以将EHC 110从蓄电池组106断开。EM 104可以用于在HEV 10被电动推进或者没有被电动推进的情况下将空气抽吸到ICE 102中。来自于EHC 110的热量与来自于由ICE 102抽吸的空气的氧气的组合,在根据用作空气泵的上述条件操作时,点火PF 112中的PM 116和保持其点火。在实施例中,EM 104通过变速器(TR)122、离合皮带轮和传动带系统(也由附图标记122指代)或者用于将EM 104机械地联接到ICE 102的任何其它合适器件(也由附图标记122指代)起作用,以利于ICE 102以受控RPM操作。虽然框312处的上述逻辑表示至EHC 110的电功率关闭与EM 104利于ICE 102旋转同时进行,但是将理解的是,EHC 110可以在EM 104用于旋转ICE 102之前或之后关闭,取决于PF 112中的PM 116是否处于点火状态(可以由控制器200经由来自于温度传感器210的任何合适信息确定,以作出该确定)。
在PF 112中的PM 116处于点火下且EHC 110关闭的情况下,控制逻辑转到框314,其中,控制器200监测表示PF 112中的PM 116的温度,在实施例中根据从温度传感器210接收的信息导出。为了保持PF 112中的PM 116的点火和再生,控制器200使用EM 104在框316升高或者在框318降低ICE 102的RPM,分别取决于PM 116的温度是指示高于还是低于限定阈值,例如700摄氏度。即,如果PM 116的温度高于阈值,那么控制逻辑经由路径340转到框316,以增加ICE 102的RPM,如果PM 116的温度低于阈值,那么控制逻辑经由路径342转到框318,以减少ICE 102的RPM。
在框320,控制器200确定PF 112的再生是否完成,可以根据适合于作出该确定的任何信息确定,包括从温度传感器210,212、差压力传感器214,216或其组合接收的信息。例如,在实施例中,如果温度传感器T1 210和温度传感器T2 212之间的温度曲线在再生期间内在T1 210处显示温度升高,随后在T2 212处显示温度升高,随后在T1 210和T2 212两者处显示温度下降,可以判定完成再生。在另一个实施例中,如果压力传感器P1 214和压力传感器P2 216之间的压力曲线在再生期间内在P1 214和P2 216之间显示高压力差,随后在它们之间显示低压力差,可以判定完成再生。如果PF 112的再生未完成,那么方法300的逻辑经由路径344循环回到框314。如果PF 112的再生完成,那么方法300的逻辑经由路径346继续框322,其中,控制器200发送信号给EM 104的控制系统204,以将EM 104从ICE 102断开,以停止ICE 102旋转,以便防止任何进一步空气抽吸到ICE 102中且从ICE 102排出并通过PF 112。从框322,方法300的逻辑经由路径348循环回到框302,其中,再生方法300连续循环,除非以其他方式中断。
回到框306,在PF 112先前确定需要再生且ICE 102运行并燃烧燃料的情况下,例如在HEV 10的操作者踩下HEV 10的加速踏板导致超出EM 104 单独容量的速度和/或功率需求时,方法300的逻辑经由路径350转到框324,其中,控制器200发送信号给ICE 102的控制单元202,以给ICE 102提供足以终止燃烧的空气-燃料比,例如大约等于与ICE 102有关的化学计量比的比,从而由ICE 102使用以燃烧燃料的所有氧被消耗,这用于窒息和熄灭PF 112中的PM 116的燃烧,以防止PF 112内的热逸出情况。
在框326,控制器200监测表示PF 112中的PM 116温度的温度,例如使用温度传感器T1 201,以确定PF 112再生是否完成。如果确定再生未完成,温度传感器T1 201将记录仍然是热条件,即,温度传感器T1 201将记录比限定阈值(例如,700摄氏度)更高的值,表示PM 116的燃烧还没有窒息和熄灭,导致方法300的控制逻辑经由路径353循环回到框324,以保持将熄灭燃烧的条件,例如空气-燃料比保持在大约化学计量比。如果在框326确定PF 112的再生完成,温度传感器T1 201将记录存在冷条件,即,温度传感器T1 201将记录比限定阈值更低的值,表示PM 116的燃烧已经窒息和熄灭,于是方法300的控制逻辑经由路径354循环回到框302,其中,再生方法300连续地循环,除非以其他方式中断。
在实施例中,方法300的连续再生循环通过控制器200实施,同时HEV 10在没有来自于ICE 102的排气流的情况下由EM104推进。
如上所述,可以计算机实施的过程和实践这些过程的设备的形式实施本发明的实施例。本发明也可实施为具有计算机程序代码的计算机程序产品的形式,该计算机程序代码包括实施在有形介质(例如软盘、CD-ROM、硬盘驱动器、USB(通用串行总线)驱动器或任何其它计算机可读存储介质(例如随机存取存储器(RAM)、只读存储器(ROM)、可擦除可编程只读存储器(EPROM)、电可擦除可编程只读存储器(EEPROM)或闪存))中的指令,其中,当计算机程序代码被载入计算机并被计算机执行时,计算机成为实践本发明的设备。本发明也可实施为计算机程序代码的形式,例如无论是存储在存储介质中、载入和/或被计算机执行、还是通过一些传输介质被传输(例如经过电线或电缆、通过光纤或通过电磁辐射无线地),其中,当计算机载入并执行计算机程序代码时,计算机成为实践本发明的设备。当在通用目的基于微处理器的控制器(例如,控制器200)上实施时,计算机程序代码段配置微处理器以生成特定逻辑电路。根据本文所述的本发明实施例,可执行指令的技术效果是再生PF中的PM,以避免增加HEV和PHEV中的PM排放。
鉴于前述说明和图示,将理解的是,方法和系统在本文描述为具有如下优点中的至少一个:减少HEV中由于多次冷发动机起动引起的PM排放;使用来自于未供应燃料ICE的空气流来利于控制PF中的PM再生;使用EHC以提供足够的催化剂温度以在没有来自于ICE的排气流的情况下(包括HEV被电动推进的时段)启动PM再生;使用来自于没有燃料燃烧的旋转ICE的空气流以将热能从EHC传输以开始PF上游端的PM的燃烧;利用PM中的内在能量来再生PF,同时使用来自于未供应燃料ICE的空气流来精确地控制燃烧温度;快速和燃料高效的PF再生过程;以及未供应燃料ICE的受控操作,以窒息和熄灭PM燃烧,例如,受控地使用化学计量比操作,以防止不受控PM再生温度。
虽然本发明已经参考示例性实施例进行描述,但是本领域技术人员将理解的是,可以作出各种变化且等价物可替代其元件,而不偏离本发明的范围。此外,可以作出许多修改以使得具体情况或材料适合于本发明的教导,而不偏离其实旨范围。因而,本发明并不旨在限于所公开的具体实施例,而本发明将包括落入本申请范围内的所有实施例。
Claims (15)
1.一种用于再生混合动力电动车辆(HEV)的颗粒过滤器(PF)中的颗粒物质(PM)的方法,所述HEV具有内燃发动机和电动马达的组合,用于推进HEV,所述HEV具有设置成与HEV的排气系统中的PF成流动连通的电加热催化剂(EHC),所述方法包括:
确定颗粒过滤器是否需要再生;
在颗粒过滤器需要再生的情况下,确定内燃发动机是否燃烧燃料;
在颗粒过滤器需要再生且内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度;以及使用电动马达以利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
2.根据权利要求1所述的方法,还包括:
在PF中的PM处于点火下的情况下,监测表示PF中的PM温度的温度;以及使用电动马达以在PM温度指示比阈值更高或更低时分别升高或降低内燃发动机的旋转速度。
3.根据权利要求2所述的方法,还包括:
确定PF的再生是否完成;以及如果是,那么停止内燃发动机的旋转以停止通过排气系统的进一步空气流。
4.根据权利要求1所述的方法,还包括:
在EHC达到适合于利于PF中的PM点火的温度之后,关闭EHC。
5.根据权利要求1所述的方法,其中:
HEV在没有来自于内燃发动机的排气流的情况下由电动马达推进。
6.根据权利要求3所述的方法,其中:
如果确定PF的再生未完成,那么继续监测PM温度,且响应于PM温度指示比阈值更高还是更低而分别升高和降低内燃发动机的旋转速度。
7.根据权利要求1所述的方法,还包括:
在内燃发动机燃烧燃料的情况下,将内燃发动机的空气-燃料比设定为大约等于与内燃发动机有关的化学计量比,使得由内燃发动机使用以燃烧燃料的所有氧气都被消耗。
8.根据权利要求7所述的方法,还包括:
监测表示PF中的PM温度的温度;
如果PM温度指示比阈值更高,那么继续将空气-燃料比设定为等于化学计量比;
如果PM温度指示比阈值更低,那么停止将空气-燃料比设定为等于化学计量比。
9.根据权利要求1所述的方法,还包括:
监测颗粒过滤器的状态,以确定颗粒过滤器是否需要再生;
如果确定颗粒过滤器不需要再生,那么继续监测颗粒过滤器的状态,直到其需要再生或者直到监测以其他方式中断。
10.一种用于混合动力电动车辆(HEV)的颗粒再生系统,所述HEV具有内燃发动机和电动马达的组合,用于推进HEV,所述系统包括:
电加热催化剂(EHC),设置成与内燃发动机的排气系统成排气流动连通;
颗粒过滤器(PF),设置成与EHC成排气流动连通且在EHC的下游;
控制器,操作性地设置成与内燃发动机的控制系统、电动马达的控制系统、EHC的控制系统和PF的控制系统成信号连通,所述控制器响应于计算机可执行指令,在由控制器执行时,所述计算机可执行指令利于再生PF中的颗粒物质(PM)的方法,所述方法包括:
确定颗粒过滤器是否需要再生;
在颗粒过滤器需要再生的情况下,确定内燃发动机是否燃烧燃料;
在颗粒过滤器需要再生且内燃发动机不燃烧燃料的情况下,电加热EHC,直到EHC达到适合于引起PF中的PM点火的温度;以及使用电动马达以利于内燃发动机以如下旋转速度旋转:所述旋转速度适合于将空气抽吸到内燃发动机中且排出内燃发动机进入排气系统、经过EHC进入PF,以利于PF中的PM点火。
11.根据权利要求10所述的颗粒再生系统,其中,由控制器利于的方法还包括:
在PF中的PM处于点火下的情况下,监测表示PF中的PM温度的温度;以及使用电动马达以在PM温度指示比阈值更高或更低时分别升高或降低内燃发动机的旋转速度。
12.根据权利要求11所述的颗粒再生系统,其中,由控制器利于的方法还包括:
确定PF的再生是否完成;以及如果是,那么停止内燃发动机的旋转以停止通过排气系统的进一步空气流。
13.根据权利要求12所述的颗粒再生系统,其中,由控制器利于的方法还包括:
如果确定PF的再生未完成,那么继续监测PM温度,且响应于PM温度指示比阈值更高还是更低而分别升高和降低内燃发动机的旋转速度。
14.根据权利要求10所述的颗粒再生系统,其中,由控制器利于的方法还包括:
在内燃发动机燃烧燃料的情况下,将内燃发动机的空气-燃料比设定为大约等于与内燃发动机有关的化学计量比,使得由内燃发动机使用以燃烧燃料的所有氧气都被消耗。
15.根据权利要求14所述的颗粒再生系统,其中,由控制器利于的方法还包括:
监测表示PF中的PM温度的温度;
如果PM温度指示比阈值更高,那么继续将空气-燃料比设定为等于化学计量比;
如果PM温度指示比阈值更低,那么停止将空气-燃料比设定为等于化学计量比。
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