CN101618718B - 一种混合动力系统及其控制方法 - Google Patents
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Abstract
本发明提供了一种混合动力系统及其控制方法,所述系统包括发动机(10)、离合器(20)、变速箱(30)、电机(40)和储能装置(50),所述电机(40)与储能装置(50)相连,所述发动机(10)通过离合器(20)与所述变速箱(30)的输入轴相连,其特征在于,所述变速箱(30)的输出轴与所述电机(40)的输出轴相连以共同输出动力。在本发明提供的混合动力系统中,变速箱(30)的输出轴与电机(40)的输出轴相连,这样当变速箱(30)在换挡过程中无动力输出的情况,电机(40)仍然可以提供动力输出,从而使得整个混合动力系统的动力输出变得连续,而不存在动力中断的情况。
Description
技术领域
本发明涉及一种混合动力系统及其控制方法。
背景技术
如图1所示,现有的混合动力系统通常包括发动机10、离合器20、电机40和储能装置50,所述电机40与储能装置50相连,所述发动机10通过离合器20与所述变速箱30的输入轴相连,所述变速箱30的输入轴与所述电机40的输出轴相连,从而所述发动机10和电机40的动力均经由所述变速箱30的输出轴而被输出。上述混合动力系统在换挡过程中会存在一段动力中断的时间,这样会影响混合动力系统的动力连续性。
发明内容
针对现有的混合动力系统在换挡过程中存在动力中断的缺陷,本发明提供了能够在换挡时输出动力平顺的混合动力系统以及该混合动力系统的控制方法。
本发明提供的混合动力系统包括发动机、离合器、变速箱、电机和储能装置,所述电机与储能装置相连,所述发动机通过离合器与所述变速箱的输入轴相连,其中,所述变速箱的输出轴与所述电机的输出轴相连以共同输出动力。
本发明提供的针对上述混合动力系统的控制方法包括:工作模式确定步骤,根据发动机的所需转速和储能装置中的电量来确定混合动力系统的工作模式为纯电动模式或并联模式;动力分配步骤,在纯电动模式下根据需求功率控制来电机的输出功率,发动机的输出功率为0;在并联模式下根据发动机的当前转速对发动机与电机的功率进行分配。
在本发明提供的混合动力系统中,变速箱的输出轴与电机的输出轴相连,这样当变速箱在换挡过程中无动力输出的情况,电机仍然可以提供动力输出,从而使得整个混合动力系统的动力输出变得连续,而不存在动力中断的情况。本发明提供的上述混合动力系统的控制方法的优点将在下面进行描述。
附图说明
图1是现有的混合动力系统的结构示意图;
图2是本发明提供的一种混合动力系统的结构示意图;
图3A和图3B是本发明提供的混合动力系统的控制方法的流程图;以及
图4是混合动力系统的工作模式与当前车速和SOC之间的关系的示意图。
具体实施方式
下面参考附图详细描述本发明。
如图2所示,本发明提供了一种混合动力系统,该混合动力系统包括发动机10、离合器20、变速箱30、电机40和储能装置50,所述电机40与储能装置50相连,其中,所述发动机10通过离合器20与所述变速箱30的输入轴相连,所述变速箱30的输出轴与所述电机40的输出轴相连以共同输出动力。
上述混合动力系统很好地解决了在换挡时的动力中断问题。本发明还针对上述混合动力系统提供了一种控制方法。该方法主要涉及确定混合动力系统的工作模式以及在并联模式的动力分配。图3A和图3B是本发明提供的混合动力系统的控制方法的流程图,具体而言,图3A是确定工作模式的流程图,图3B是控制动力分配的流程图。下面结合图3A和图3B描述本发明提供的控制方法。
本发明提供了一种上述混合动力系统的控制方法,该方法包括:工作模式确定步骤,根据当前车速和储能装置50中的电量来确定混合动力系统的工作模式为纯电动模式或并联模式;动力分配步骤,在纯电动模式下根据需求功率控制来电机40的输出功率,发动机10的输出功率为0;在并联模式下根据发动机10的转速对发动机10与电机40的功率进行分配。
其中,所述工作模式确定步骤包括:判断是否是第一次确定工作模式;如果是第一次确定工作模式,则确定工作模式为纯电动模式;否则,比较当前车速与预定车速;当所述当前车速小于预定车速V1时,确定工作模式为纯电动模式;当所述当前车速大于预定车速V1时,根据所述储能装置50中的电量SOC来确定工作模式为纯电动模式或并联模式。所述预定车速V1为车辆在发动机10以最低工作转速转动时的车速。图4显示了混合动力系统的工作模式与当前车速和SOC之间的关系。当所述当前车速小于预定车速V1时,表明此时需要发动机10以小于其最低工作转速的转速转动,因此此时发动机10不可能工作,只能由电机40单独进行驱动,工作模式为纯电动模式。而当所述当前车速大于预定车速V1时,则需要进一步考虑储能装置50中的储能情况来确定混合动力系统的工作模式。
通常所述储能装置50具有放电下限SOC1和充电上限SOC2,且0%<SOC1<SOC2<100%;当所述前车速大于预定车速时,通过将储能装置50中的电量SOC与SOC1和SOC2进行比较来确定混合动力系统的工作模式:当SOC≤SOC1时,确定工作模式为并联模式;当SOC1<SOC<SOC2时,确定工作模式为前一次的工作模式;当SOC≥SOC2时,确定工作模式为纯电动模式。所述放电下限SOC1可以根据储能装置50本身的性能而定,例如可以为10%;基于避免过多地利用发动机10发电而过度消耗燃油的考虑,所述充电上限SOC2一般可以被设置为60%。充电上限SOC2。上述工作模式的确定方式使得混合动力系统最大可能地利用了储能装置50的电量进行驱动,从而减小了发动机10中燃油的消耗。
众所周知,发动机10在一定转速下,不同的输出功率对应着不同的输出效率,即每个转速点下都会有对应的最佳输出功率,以满足最佳输出效率。当发动机10在某转速下的输出功率不是最佳输出功率,则会导致燃料不能充分燃烧,会额外损失一定的油耗并且所排放的气体会对环境造成污染。为了减小能量浪费和保护环境,在并联工作模式下进行动力分配时需要应该优先考虑发动机10的输出效率,本发明的控制方法在混合动力系统处于并联模式下时的具体动力分配策略为:根据混合动力系统的最大输出功率P_max和当前油门深度Acc来确定需求功率P,即通过公式P=P_max×Acc来进行计算;根据发动机10的转速确定发动机10在当前转速下的最佳输出功率Pe_opt;控制发动机10的输出功率为最佳输出功率pe_opt,控制电机40的输出功率为所述需求功率P与最佳输出功率。Pe_opt之差。当P与Pe_opt之差为正数时,电机40处于驱动状态,而当P与Pe_opt之差为负数时,电机40处于发电状态。由此而在满足发动机10工作效率的情况下进行了对发动机10和电机40的输出功率进行了分配,使得发动机10可以发挥最大的工作效率。
所述发动机10的最佳输出功率的确定包括:确定发动机10的转速;在发动机10的转速功率对照表中查询与该转速对应的最佳输出功率。所述转速功率对照表通常存储在发动机10的控制器中。
发动机10的转速可以通过以下方式获得:(1)根据车速v、当前档位下车轮转速与发动机10的转速之间的减速比i以及车轮半径r来进行计算发动机10的转速Ve,计算公式为 (2)通过在发动机10中设置转速检测传感器而直接确定发动机10的转速。当然发动机10的转速的确定并不限于上述两种方式,本领域常用的其他方法也是可以的。
本发明还针对所述混合动力系统提供了换挡步骤,该步骤包括:在保持发动机10的输出功率和电机40的输出功率之和不变的情况下,减小发动机10的输入功率且增大所述电机40的输出功率;当发动机10的输出功率减小到0时,控制离合器20分离并控制变速箱30进行换档;换挡结束之后,根据新档位重新调整发动机10的转速,并吸合离合器20;吸合离合器20之后,控制发动机10的输出功率逐渐变化到与所述发动机10的转速相对应的最佳输出功率。在上述换挡过程中,在断开发动机10的功率输出时通过增大电机40的输出功率,使得混合动力系统的总输出功率不便,保证了整个动力系统的动力的连续性。
所述换挡步骤中的发动机10的最佳输出功率的确定与上述动力分配策略中的相同,于此不再详述。
本发明提供的混合动力系统以及该系统的控制方法很好地满足了动力输出的连续性,而且在工作模式确定和动力分配方面均保证了燃油利用效率,此外,还通过控制电机40来补偿发动机10与整车需求功率之间的差额而保证了换挡过程中动力的平稳输出。
Claims (7)
1.一种混合动力系统的控制方法,该混合动力系统包括发动机(10)、离合器(20)、变速箱(30)、电机(40)和储能装置(50),所述电机(40)与储能装置(50)相连,所述发动机(10)通过离合器(20)与所述变速箱(30)的输入轴相连,所述变速箱(30)的输出轴与所述电机(40)的输出轴相连以共同输出动力,该控制方法包括:
工作模式确定步骤,根据当前车速和储能装置(50)中的电量来确定混合动力系统的工作模式为纯电动模式或并联模式;
动力分配步骤,在纯电动模式下根据需求功率控制来电机(40)的输出功率,发动机(10)的输出功率为0;在并联模式下根据发动机(10)的转速对发动机(10)与电机(40)的输出功率进行分配;
该控制方法还包括换档步骤,所述换档步骤包括:在保持发动机(10)的输出功率和电机(40)的输出功率之和不变的情况下,减小发动机(10)的输入功率且增大所述电机(40)的输出功率;当发动机(10)的输出功率减小到0时,控制离合器(20)分离并控制变速箱(30)进行换档;换挡结束之后,根据新档位重新调整发动机(10)的转速,并吸合离合器(20);吸合离合器(20)之后,控制发动机(10)的输出功率变化到与所述发动机(10)的转速相对应的最佳输出功率。
2.根据权利要求1所述的方法,其中,在并联模式下,所述动力分配步骤包括,
根据混合动力系统的最大输出功率和当前油门深度来确定需求功率;
根据发动机(10)的转速确定发动机(10)在当前转速下的最佳输出功率;
控制发动机(10)的输出功率为最佳输出功率,控制电机(40)的输出功率为所述需求功率与最佳输出功率之差。
3.根据权利要求2所述的方法,其中,所述发动机(10)的最佳输出功率的确定包括:
确定发动机(10)的转速;
在发动机(10)的转速功率对照表中查询与该转速对应的最佳输出功率。
4.根据权利要求1-3中任一项所述的方法,其中,所述工作模式确定步骤包括:
判断是否是第一次确定工作模式;
如果是第一次确定工作模式,则确定工作模式为纯电动模式;
否则,比较当前车速与预定车速;
当所述当前车速小于预定车速时,确定工作模式为纯电动模式;
当所述当前车速大于或等于预定车速时,根据所述储能装置(50)中的电量SOC来确定工作模式为纯电动模式或并联模式。
5.根据权利要求4所述的方法,其中,所述预定车速为当发动机(10)以最低工作转速转动时的车速。
6.根据权利要求4所述的方法,其中,所述储能装置(50)具有放电下限SOC1和充电上限SOC2,且0%<SOC1<SOC2<100%;当所述前车速大于预定车速时,
当SOC≤SOC1时,确定工作模式为并联模式;
当SOC1<SOC<SOC2时,确定工作模式为前一次的工作模式;
当SOC≥SOC2时,确定工作模式为纯电动模式。
7.根据权利要求1所述的方法,其中,所述发动机(10)的最佳输出功率通过以下步骤来确定:
确定发动机(10)的转速;
在发动机(10)的转速功率对照表中查询与该转速对应的最佳输出功率。
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