CN103847498A - 限制发动机扭矩以保护车辆的分离离合器的方法和装置 - Google Patents
限制发动机扭矩以保护车辆的分离离合器的方法和装置 Download PDFInfo
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- B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
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Abstract
本发明公开了一种限制发动机扭矩以保护车辆的分离离合器的方法和装置。动力传动系统包含发动机、马达、连接在发动机和马达之间的分离离合器以及变速器。变速器通过启动离合器连接至马达并通过分离离合器选择性地且间接地连接至发动机。控制器接收发动机扭矩输出信号并将发动机的扭矩输出减小至离合器容量极限值。还提供了一种控制混合动力车辆的动力传动系统的系统和方法。
Description
技术领域
本发明涉及混合动力车辆的动力传动系统,该动力传动系统具有组合或独立提供扭矩以驱动车辆的发动机和电机(或马达/发电机)。
背景技术
通过限制至变速器的输入扭矩的接口而保护用于具有内燃发动机的车辆的变速器。在一些混合动力车辆中内燃发动机和电机(或马达/发电机)都可用于产生扭矩并且它们可通过分离离合器分离。通过启动离合器将内燃发动机和电机提供的扭矩的总和传输至变速器的输入。启动离合器必须被定级(rate)以控制住来自发动机和电机的扭矩,包括惯性扭矩。
变速器接口可用于限制至变速器输入的扭矩以保护连接扭矩产生器(例如内燃发动机)和变速器的启动离合器。在具有不止一个扭矩源的混合动力车辆的动力传动系统中这些变速器接口不能分别限制发动机扭矩和电机扭矩。结果是,使用现有的变速器接口没有保护分离离合器。为了弥补缺少的保护,可能需要系统控制器将总的输入扭矩减小到驾驶员需求以下以防止分离离合器超过扭矩负荷。
本发明集中于涉及分离离合器过度扭矩的保护的上述问题和其它问题。
发明内容
可通过建立包括可以集成进混合动力变速器的分离离合器的独立子系统来处理上述问题。建立将分离离合器的限制传递至车辆系统控制器的接口。在车辆运转期间车辆系统控制来限制发动机扭矩和/或电机扭矩。在限制发动机扭矩的事件中,可通过添加电机扭矩来满足驾驶员需求的扭矩。
根据本发明的一个方面,动力传动系统包含发动机、马达、连接在发动机和马达之间的分离离合器、以及变速器。变速器通过启动离合器连接至马达并通过分离离合器选择性地以及间接地连接至发动机。控制器接收发动机扭矩输出信号并将发动机的扭矩输出减小至离合器容量(clutch capacity)极限值。
根据本发明的另一方面,公开了一种控制动力传动系统的方法,该动力传动系统包括通过分离离合器分离的并提供扭矩至变速器的发动机和马达。在某种程度上,该方法包含将发动机产生的扭矩减小至分离离合器容量极限。
根据本发明的又一方面,提供了一种用于控制混合动力车辆的动力传动系统的系统。该动力传动系统包括发动机、连接至发动机的马达以及连接至马达的变速器。分离离合器可操作地连接在发动机和马达之间并操作用于分离发动机和马达。发动机和马达选择性地连接至变速器。控制器将发动机产生的扭矩减小至分离离合器容量极限。
之前描述的动力传动系统、控制动力传动系统的方法以及用于控制动力传动系统的系统还可以包括额外的特征,其中控制器可以指令马达增加来自马达的扭矩输出,以满足驾驶员对扭矩的需求并补偿发动机扭矩输出的减小。当启动离合器打开或滑动时控制器可以减小马达扭矩至负的分离离合器容量极限值。发动机输出扭矩信号对应于发动机产生的扭矩和发动机惯性扭矩的总和。马达扭矩信号是马达产生的扭矩和马达惯性扭矩的总和。发动机输出扭矩信号可以是发动机产生的扭矩和发动机惯性扭矩的总和。控制器将发动机输出扭矩信号与分离离合器容量极限值比较。
根据本发明的一个实施例,控制器指令马达增加来自马达的扭矩输出以满足驾驶员对扭矩的需求并补偿发动机的扭矩输出的减小。
根据本发明的一个实施例,当启动离合器打开或滑动时控制器减小马达扭矩至负分离离合器容量极限值。
根据本发明的一个实施例,发动机输出扭矩信号是发动机产生的扭矩和发动机惯性扭矩的总和,而马达扭矩信号是马达产生的扭矩和马达惯性扭矩的总和。
根据本发明的一个实施例,发动机输出扭矩信号是发动机产生的扭矩和发动机惯性扭矩的总和,并且其中将发动机输出扭矩信号与分离离合器容量极限值比较。
根据本发明的一个实施例,发动机产生的扭矩包括发动机惯性扭矩。
将会在具体实施方式中参考附图更详细地描述本发明的上述方面和其它方面。
附图说明
图1是混合动力车辆动力传动系统的示意代表;
图2是图1中显示的动力传动系统的简化示意图,其中启动离合器是接合的;
图3是显示控制器限制发动机扭矩至分离离合器容量的扭矩图表;
图4是显示控制器限制发动机扭矩至分离离合器容量并指令马达产生包括惯性扭矩的额外扭矩来满足驾驶员需求的扭矩图表;
图5是图1中显示的动力传动系统的简化图,其中启动离合器打开或滑动,发动机扭矩被限制至分离离合器容量而通过分离离合器负极限来限制电机扭矩;以及
图6是显示车辆系统控制限制发动机扭矩和电机扭矩的打开/滑动离合器的图表。
具体实施方式
下文提供了本发明说明的实施例的具体实施方式。公开的实施例是本发明的示例,其可以多种替代形式实施。附图无需按比例绘制;可放大或缩小一些特征以显示特定部件的细节。本申请公开的具体结构和功能细节不应解释为限定,而仅为教导本领域技术人员怎样实施本发明的代表性基础。
参考图1,示意地说明了用于混合动力车辆的动力传动系统10。发动机12和马达14单独或组合提供扭矩输入至动力传动系统10。变速器16接收来自发动机12和马达14的扭矩。
在发动机12和马达14之间提供有分离离合器20。分离离合器20允许通过发动机12、通过马达14或者通过发动机12和马达14两者提供扭矩。分离离合器20还允许发动机20连接至马达14用于充电。
在马达14和变速器16之间提供有启动离合器22。启动离合器22在无论何时变速器16需要扭矩时接合而在车辆泊车或处于空档时分离。
车辆系统控制器24响应于驾驶员需求扭矩而接收对应于驾驶员需求扭矩的信号并控制发动机12和马达14产生扭矩。
电池26电连接至马达14。电池26提供能量以驱动马达14。当发动机12正在运转且分离离合器20连接发动机12和马达14以运转马达14作为发电机时,马达14提供能量至电池用于存储。
来自变速器16的扭矩提供至差速器28以驱动车轮30。
参考图2,显示了简化的动力传动系统图表,其中可以通过分离离合器20将发动机12连接至马达14。如图2中说明的分离离合器20是打开的。通过图2中显示为闭合的启动离合器22将扭矩提供至变速器。
参考图3,提供了车辆系统控制器24将提供的发动机扭矩限制为分离离合器正极限的图示代表。通过线32说明限制的发动机扭矩。通过线34说明请求的发动机扭矩。通过线36说明马达扭矩。通过线40表示零扭矩线。
线32最初增加直到达到分离离合器正极限线42。然而,因为如虚线34指示的请求的发动机扭矩超过分离离合器正极限线42,所以来自发动机的扭矩被限制。马达扭矩线36最初减小到零扭矩线40以下指示随着发动机扭矩的增加而以更高的速率充电电池。马达扭矩36增加以补偿相对于驾驶员需求扭矩的扭矩差额,直到发动机扭矩线32超过分离离合器正极限线42。马达扭矩达到满足需求的水平之后减小发动机扭矩。
通过分离离合器20传输发动机12产生的包括惯性扭矩的扭矩。马达14可以产生包括满足驾驶员需求所需的并且不被分离离合器容量限制的惯性扭矩的扭矩。车辆系统控制器24减小包括惯性扭矩的发动机扭矩以保护分离离合器20。通过分离离合器容量限制包括惯性扭矩的发动机扭矩。对于特定档位或特定档位变换期间而言分离离合器容量可以不同。
参考图4,如之前参考图3描述的,显示了动力传动系统10的运转而马达14添加扭矩以补偿发动机扭矩的限制。升高的马达扭矩线46说明马达14用于补偿而提供的扭矩,以通过将发动机12提供的扭矩减小至分离离合器正极限水平42而保护分离离合器20。未升高的马达扭矩线48代表如果没有限制发动机扭矩来保护分离离合器20,那么通过马达14将会正常提供的扭矩水平。结合极限线32的发动机扭矩和升高的马达扭矩线46的总和以提供需求的和传输的扭矩线50。
参考图5,显示了包括通过分离离合器20连接发动机12至马达14的动力传动系统的简化图表。可操作地连接在马达14和变速器16之间的启动离合器22在图5中是打开的以代表打开的或滑动的启动离合器状况。在空档、泊车或缓慢行驶(creep)运转模式中,当马达充电电池26(图1中显示的)时可以打开或滑动启动离合器。这种情况下,车辆系统控制器24必须限制包括各自惯性扭矩的发动机扭矩和马达扭矩两者以保护分离离合器20。
参考图6,如参考图3描述的限制发动机扭矩以防止分离离合器超过其正极限42。线52说明限制的电机扭矩。当充电时电机扭矩不能超过分离离合器负极限44。结果是,限制的马达扭矩54比请求的马达扭矩54负的更少。通过限制发动机扭矩和电机扭矩两者而防止分离离合器20超过其正极限线42。防止分离离合器20超过线44表示的它的负极限。
离合器容量方程式是施加至离合器的压力的函数。离合器容量方程式是:(发动机扭矩-发动机惯性扭矩)的绝对值=(马达扭矩-马达惯性扭矩-启动离合器扭矩)的绝对值。
尽管上文描述了示例性实施例,并非意味着这些实施例描述了公开的装置和方法的所有可能形式。相反,说明书中使用的词语为描述性词语而非限定,并且应理解可作出各种改变而不脱离本发明的精神和范围。此外,可组合各种执行实施例的特征以形成本发明进一步的实施例。
Claims (10)
1.一种动力传动系统,其特征在于,所述动力传动系统包含:
发动机;
马达;
连接在所述发动机和所述马达之间的分离离合器;
连接至所述马达并选择性地连接至所述发动机的变速器;
连接在所述马达和所述变速器之间的启动离合器;以及
控制器,用于接收发动机扭矩信号并将所述发动机的所述扭矩输出减小至分离离合器容量极限值。
2.一种用于控制动力传动系统的方法,所述动力传动系统包括通过分离离合器分离且提供扭矩至变速器的发动机和马达,其特征在于,所述方法包含:
将所述发动机产生的扭矩减小至分离离合器容量极限。
3.根据权利要求2所述的方法,其特征在于,所述方法进一步包含:
将所述马达的所述扭矩输出增加所述发动机扭矩减小的所述量。
4.根据权利要求2所述的方法,其特征在于,如果在所述马达和所述发动机之间的启动离合器是打开的或滑动的,将所述马达扭矩减小至负的分离离合器容量极限值。
5.根据权利要求4所述的方法,其特征在于,所述发动机产生的扭矩包括发动机惯性扭矩而所述马达产生的扭矩包括马达惯性扭矩。
6.一种用于控制动力传动系统的系统,其特征在于,所述系统包含:
发动机;
连接至所述发动机的马达;
连接至所述马达的变速器;
可操作地连接在所述发动机和所述马达之间且可操作用于分离所述发动机与所述马达的分离离合器,其中所述发动机和所述马达选择性地连接至所述变速器;以及
将所述发动机产生的扭矩减小至分离离合器容量极限的控制器。
7.根据权利要求6所述的系统,其特征在于,所述控制器指令所述马达增加来自所述马达的扭矩输出以满足驾驶员对扭矩的需求并补偿所述发动机的所述扭矩输出减小。
8.根据权利要求6所述的系统,其特征在于,当启动离合器打开或滑动时控制器减小通过所述马达产生的所述扭矩至负的分离离合器容量极限值。
9.根据权利要求8所述的系统,其特征在于,所述发动机输出扭矩信号是通过所述发动机产生的扭矩和发动机惯性扭矩的总和而所述马达扭矩信号是通过所述马达产生的扭矩和马达惯性扭矩的总和。
10.根据权利要求6所述的系统,其特征在于,所述发动机输出扭矩信号是通过所述发动机产生的扭矩和发动机惯性扭矩的总和。
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