CN102307767B - 用于联接并联式混合传动系的内燃机的方法 - Google Patents
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Abstract
本发明公开了一种用于通过布置于内燃机(2)与电机(3)之间布置的离合器装置(4)来联接并联式混合传动系(1)的内燃机(2)的方法,其从离合器装置(4)打开的运行状态、内燃机(2)的至少近似相应于空转转速的转速、以及电机(3)的大于内燃机(2)的空转转速的转速出发来进行。根据本发明,当存在大于转矩阈值的驱动转矩值的要求时,将内燃机(2)的转速调到电机(3)的转速之上的转速值,并且离合器装置(4)在达到该转速值时被有滑差地闭合,而在传动系(1)的滑行运行中,内燃机(2)当存在联接内燃机(2)的要求时被转换为滑行燃料切断模式,并且内燃机(2)的转速在离合器装置(4)的闭合过程期间依赖于离合器装置(4)的传递能力而被调到电机(3)的转速。
Description
技术领域
本发明涉及一种用于通过布置于内燃机与电机之间的离合器装置来联接并联式混合传动系的内燃机的方法。
背景技术
由实践公知的并联式混合传动系,通常布置有:内燃机、电机以及布置于内燃机与电机之间的离合器装置。电机抗相对转动地与关于电机布置在从动侧的变速器的变速器输入轴相连接,在该变速器范围内可以表现出不同的传动比。因此,电机的转速基本上相应于变速器输入转速。
在实施有并联式混合传动系的混合动力汽车进行纯电的行驶运行期间,其中,内燃机与电机之间的离合器装置是打开的,并且电机的转速高于内燃机的空转转速,并且内燃机在空转中运行,当依赖于运行状态地需要将内燃机联接到传动系上,并且因此表现为混合行驶运行时,所述离合器装置会被闭合。
如果存在闭合离合器装置的相应要求,在离合器装置的闭合过程之前将内燃机的转速提升到与电机转速相同的变速器输入转速,并且使该离合器装置同步化。在此,内燃机的转速以转速受调节的方式或者还通过转矩调节来向离合器装置的同步转速的方向加速,所述离合器装置在达到其同步点时以小负荷被闭合。接下来,内燃机侧的负荷建立通过对内燃机转矩的调节来进行。
如果内燃机的联接过程例如在如下的上坡期间实施,即在传动系的牵引运行中需要高转矩的上坡期间实施的话,内燃机直接在闭合离合器装置之后提供由内燃机的转速-转矩特征曲线得出的转矩值,作为最大的驱动转矩。
不利的是,由内燃机在闭合离合器装置后所提供的驱动转矩在离合器装置的相应低的转速或同步转速的情况下,不足以执行驾驶员所期待的功率增长。这意味着,汽车在传动系的这种运行状态中通过内燃机首先仅能受制约()地加速。同时,在这种内燃机的低转速水平上,在内燃机的转矩输出同时很高的情况下,就促成了马达接下来熄火的感觉。
当驾驶员在将内燃机联接到传动系期间操作汽车的行驶踏板,并且突然地例如依赖于行驶状况而需要明显更高的驾驶员期望转矩时,则出现类似不利的运行状态变化进程。在传动系通过同步闭合离合器装置而处于混合行驶运行中的时刻,可以通过内燃机又提供用于执行所期望的汽车加速而必需的要求的转矩,而不伴随有相应的突然性。
在并联式混合传动系的滑行运行(Schubbetrieb)中需要内燃机制动力矩的运行状态变化进程期间,内燃机的前面介绍的达到电机水平或传动系的变速器输入转速水平的主动加速导致了内燃机不希望的燃料消耗。
此外,将内燃机联接到传动系的要求在行驶阻力变化剧烈的运行状态变化进程期间被视为是很严峻的。这一点由如下事实引起,即,在其并联式混合传动系的牵引运行中当存在突然上坡时,汽车在如下的范围内被延迟,即,内燃机的联接在技术上不再具有意义,并且必须再次打开离合器装置,这是因为在这种情况下,驱动侧的牵引力供应太小,并且在变速器的区域内开始换倒档。这样的运行状态变化进程的特征在于:高运行噪音、低驾驶舒适性以及不期望的高不稳定性以及高构件负荷。
发明内容
因此,本发明基于如下任务,即,提供一种用于联接并联式混合传动系的内燃机的方法,凭借所述方法能避免前面介绍的缺点。
根据本发明,所述任务凭借具有下述特征的方法而得以解决:
在根据本发明的用于通过布置于内燃机与电机之间的离合器装置来联接并联式混合传动系内燃机的方法中,其中,该方法从离合器装置的打开运行状态、至少近似地相应于空转转速的内燃机转速、以及大于内燃机空转转速的电机转速出发来进行,其中,在传动系的牵引运行中并且存在联接内燃机的要求以及存在小于转矩阈值的驱动转矩值时,内燃机的转速被调到电机的转速,并且离合器装置至少近似地在同步运行状态中被闭合,而且接下来提升内燃机的转矩;当存在大于转矩阈值的驱动转矩值的要求时,内燃机的转速被调到电机的转速之上的转速值,并且离合器装置在达到该转速值时被有滑差地闭合,而内燃机在传动系的滑行运行中,当存在联接内燃机的要求时,被转换为滑行燃料切断模式(Schubabschaltung),并且内燃机的转速在离合器装置的闭合过程期间依赖于离合器装置的传递能力而被调到电机的转速。
相对于以传统方式运行的内燃机,根据本发明运行的并联式混合传动系的内燃机,当在并联式混合传动系的牵引运行中存在联接内燃机的要求时,当同时需要在离合器装置闭合过程结束时内燃机的高驱动转矩时,已经在如下转速水平上运行,在该转速水平上,所述内燃机分别提供至少近似相应于根据要求的转矩的转矩。附加地,基于在闭合过程期间有滑差地运行的离合器装置,旋转中的内燃机的飞轮质量是可以利用的,也就是说,不仅静态的马达力矩还有动态份额也可以利用,从而在从动件的区域内能分别至少近似表现出所要求的驱动力矩。
在并联式混合传动系的滑行运行中,借助依据本发明的方法在从动件的区域内,通过联接内燃机在内燃机不消耗燃料的情况下,就分别可以提供所期望的滑行力矩,这是因为离合器装置将分别在滑行燃料切断模式中运行的内燃机在滑差运行中调至电机的转速水平上。
在依照本发明的方法的具有优点的改进方案中,当存在联接内燃机的要求而且存在大于转矩阈值的内燃机侧驱动转矩值时,内燃机的转速得到受调节地调整。
对此可选的是,当存在联接内燃机的要求和存在大于转矩阈值的内燃机侧驱动转矩值时,在内燃机转速提升期间,内燃机的驱动力矩可以被界定至一预先限定的转矩值上,以便以很少的控制和调节花费来避免内燃机转速的不受限定的升高。
对离合器装置的操作在内燃机侧驱动力矩的要求变换时和/或当传动系在牵引运行与滑行运行之间发生变换时,是可以改变的,由此例如可以避免传动系内妨碍汽车驾驶舒适性的反作用力矩。
附图说明
本发明的其他优点和具有优点的改进方案可以由权利要求和参考附图进行原理性介绍的实施例而得出。
其中:
图1示出汽车的并联式混合传动系的简化图示;
图2示出随时间推移当要求驱动转矩值小于转矩阈值时在内燃机联接过程期间,依据图1的并联式混合传动系的运行参数的不同变化进程;
图3示出当存在驱动转矩值大于转矩阈值的要求时在内燃机联接过程期间,运行状态参数的变化进程的与图2相应的图示;以及
图4示出在并联式混合传动系的滑行运行中,在内燃机联接过程期间,运行状态参数的变化进程的与图2相应的图示。
具体实施方式
图1示出汽车的具有内燃机2和电机3的并联式混合传动系1。在内燃机2与电机3之间布置有离合器装置4,通过离合器装置4,内燃机2可以与传动系1分开或者可以连接到该传动系1上。与内燃机2相关地,在电机3的从动侧上设置有另一离合器装置5、变速器装置6以及并联式混合传动系1的从动件7,其中,所述另一离合器装置5在打开状态中使电机3与变速器装置6之间的有效连接失效。
在图2至图4中分别示出随时间推移在不同运行状态变化进程期间,依据图1的并联式混合传动系1的运行状态参数的变化进程,其中,根据图2和图3的运行状态变化进程分别至少近似地自并联式混合传动系1的相同的运行点出发。
依照图2至图4的运行状态变化进程所基于的并联式混合传动系1的起始点或运行点的特征在于,离合器装置4首先位于完全打开的运行状态中,并且内燃机2的转速n_mot至少近似地相应于内燃机2的空转转速n_mot_ll。此外,电机3的转速大于内燃机2的空转转速n_mot_ll。在整个接下来所关注的时间段,即在分别表现为变化进程所基于的运行状态变化进程的起始点的时间段T0与离合器装置4基本上完全闭合的时刻T2之间延伸的时间段期间,另外的离合器装置5处于完全闭合的运行状态中。
由此,变速器装置6的变速器输入转速n6_ein在整个时间段期间相应于电机3的转速n_EM。此外,实施有依照图1的并联式混合传动系1的混合动力汽车在需要将内燃机2联接到并联式混合传动系1时分别以纯电的方式运行,其中,存在于从动件7上的从动力矩在时刻T0时通过电机3单独提供。
例如当分配给电机3的蓄电器存在充电状态时,或当在并联式混合传动系1的牵引运行中适度提高驾驶员侧的所要求的驱动力矩抑或是在并联式混合传动系1的滑行运行中从动件7处的滑行力矩的提高需要将内燃机2联接到传动系1上的情况下,则产生联接内燃机2的要求。
在时刻T0,并联式混合传动系1分别处在其初始运行点中,其中,在并联式混合传动系1的牵引运行中并且存在联接内燃机2的要求时以及存在小于转矩阈值的驱动转矩值的情况下,当离合器装置4以图2中详细示出的方式和方法同时完全打开的情况下,内燃机2的转速n_mot被调到电机3的转速n_EM。内燃机2以转速或转矩受调节的方式被提升或加速到变速器输入转速n6_ein或电机的转速n_EM。
离合器装置4在时刻T1至少近似达到其同步运行状态,当获知其同步状态时通过提高操作力F4几乎无负载地闭合离合器装置4,并在时刻T2,离合器装置4存在于其完全闭合的运行状态中。接下来,内燃机2的转矩被提高,以提供所要求的转矩值。
当需要大于转矩阈值的驱动转矩值并且在传动系1的牵引运行中,所要求的转矩超过电机3的最大驱动力矩时,自传动系1在时刻T0时的前述运行状态出发,将内燃机2以图3中示出的方式和方法联接到传动系1上。于是,需要强制性地将内燃机2突然性地联接到传动系1上,以提高功率。
依赖于各所存在的应用情况,内燃机2以转速受调节、力矩受限制或自由加速(freihochlauf)的方式加速到电机3的转速n_EM之上的转速值,并且离合器装置4在达到该转速值时,通过操作力F4的斜坡形升高而被有滑差地闭合。基于离合器装置4的有滑差的运行,为了提高在并联式混合传动系1中可供使用的驱动力矩,附加地还利用了内燃机2的飞轮质量,也就是说,不仅利用静态马达力矩而且也利用动态份额。因为与在事先描述的操作方法中以及与以传统方式运行的并联式混合传动系相比较下,内燃机2在联接时刻已经在较高的转速水平上运动,所以在与汽车的以传统方式运行的传动系的比较中,在内燃机2的联接时刻,有更高的转矩可供使用。
因此,内燃机2的转速n_mot当存在大于转矩阈值的驱动转矩值的要求时,被调到电机的转速n_EM之上的转速值,并且离合器装置4在达到该转速值时被有滑差地闭合。在离合器装置4被以其闭合力加载的时刻T2时,离合器装置4被完全闭合。
在依据图4的并联式混合传动系1的运行状态参数的变化进程所基于的运行状态变化进程中,并联式混合传动系1位于牵引运行中,并且离合器装置4在时刻T0被打开,而内燃机2的转速n_mot相应于空转转速n_mot_ll,电机3的在另外的变速器5闭合时相应于变速器输入转速n6_ein的转速n_EM大于空转转速n_mot_ll。
为了可以在并联式混合传动系1的从动件7处生成不能由电机3单独产生的滑行力矩,则发出用于联接内燃机2的要求,并且内燃机2被转换为滑行燃料切断模式或在该滑行燃料切断模式下继续运行。离合器装置4依赖于其传递能力或由此可引导的转矩被受调节地有滑差地闭合。内燃机2的转速n_mot在离合器装置4的闭合过程期间以图4中示出的方式方法依赖于离合器装置4的传递能力被调到电机3的转速n_EM或变速器输入转速n6_ein的水平。在此,内燃机2在滑行燃料切断模式中不耗费燃料,并且处在从动件7处的滑行力矩在驱动机2已联接的情况下,可在所期望的范围内生成。
离合器装置4的传递能力在闭合过程期间被以如下方式受调节地调整,即,一方面内燃机的转速没有跳跃式的升高,另一方面从动件转速没有妨碍驾驶舒适性地下降或减少。
此外,附加地设置为,当改变输出条件时,特别是与各所要求的转矩相关地改变以及并联式混合传动系1在滑行运行与牵引运行之间变换时,在所述方法的结合图2至图4详细介绍的功能性的变化进程期间,分别在三个子功能之间实行无缝的过渡,通过这种无缝的过渡,各自保证了相应于行驶状况的优化规程。
附图标记:
1 并联式混合传动系
2 内燃机
3 电机
4 离合器装置
5 另外的离合器装置
6 变速器装置
7 从动件
F4 离合器装置的操作力
n_EM 电机的转速
n_mot 内燃机的转速
n6_ein 变速器输入转速
t 时间
T0至T2 离散的时刻
Claims (5)
1.用于通过布置于内燃机(2)与电机(3)之间的离合器装置(4)来联接并联式混合传动系(1)的内燃机(2)的方法,其从所述离合器装置(4)打开的运行状态、所述内燃机(2)的至少近似相应于空转转速(n_mot_ll)的转速(n_mot)、以及所述电机(3)的大于所述内燃机(2)的空转转速(n_mot_ll)的转速(n_EM)出发来进行,其中,在所述传动系(1)的牵引运行中以及当存在联接所述内燃机(2)的要求并且存在小于转矩阈值的驱动转矩值时,将所述内燃机(2)的转速(n_mot)调到所述电机(3)的转速(n_EM),并且将所述离合器装置(4)至少近似地在同步运行状态中闭合,并且其中,接下来,提高所述内燃机(2)的转矩,其特征在于,当存在对大于所述转矩阈值的驱动转矩值的要求时,将所述内燃机(2)的转速(n_mot)调到所述电机(3)的转速(n_EM)之上的转速值,并且将所述离合器装置(4)在达到所述转速值时有滑差地闭合,而将所述内燃机(2)在所述传动系(1)的滑行运行中,当存在联接所述内燃机(2)的要求时,转换为滑行燃料切断模式,而且将所述内燃机(2)的转速(n_mot)在所述离合器装置(4)的闭合过程期间,依赖于所述离合器装置(4)的传递能力来调到所述电机(3)的转速(n_EM)。
2.根据权利要求1所述的方法,其特征在于,当存在联接所述内燃机(2)的要求并且存在大于所述转矩阈值的驱动转矩值时,将所述内燃机(2)的转速(n_mot)受调节地调整。
3.根据权利要求1或2所述的方法,其特征在于,当存在联接所述内燃机(2)的要求而且存在大于所述转矩阈值的驱动转矩值时,在提高所述内燃机(2)的转速(n_mot)期间,将所述内燃机(2)的驱动力矩界定至预先限定的转矩值。
4.根据权利要求1或2所述的方法,其特征在于,在对驱动转矩的要求变换时,改变对所述离合器装置(4)的操作。
5.根据权利要求1或2所述的方法,其特征在于,在所述并联式混合传动系(1)在牵引运行与滑行运行之间变换时,改变对所述离合器装置(4)的操作。
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