CN105593091A - 用于控制具有双离合变速器的动力传动系的方法 - Google Patents

用于控制具有双离合变速器的动力传动系的方法 Download PDF

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CN105593091A
CN105593091A CN201480054099.1A CN201480054099A CN105593091A CN 105593091 A CN105593091 A CN 105593091A CN 201480054099 A CN201480054099 A CN 201480054099A CN 105593091 A CN105593091 A CN 105593091A
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friction
clutch
sub
speed changer
moment
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CN105593091B (zh
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格奥尔格·格佩特
阿图尔·施拉帕
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Schaeffler Technologies AG and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/68—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings
    • F16H61/684—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive
    • F16H61/688—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
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Abstract

本发明涉及一种用于控制动力传动系的方法，所述动力传动系具有：内燃机；双离合变速器，所述双离合变速器具有第一和第二子变速器，其具有至少一个能切换的传动级；设置在内燃机和第一子变速器之间的第一摩擦离合器以及设置在内燃机和第二子变速器之间的第二摩擦离合器，用于通过经由摩擦离合器传递为此设定的发动机力矩来提供施加在双离合变速器的变速器输出端上的驱动系力矩。为了能够继续运行具有可能先前损坏的摩擦衬片的摩擦离合器，在经由第一摩擦离合器传递第一离合器力矩的情况下，依据第二摩擦离合器的第二摩擦衬片的当前温度和摩擦系数，将第二摩擦离合器在传动级接入第二子变速器中的情况下滑动地施加并且将所述摩擦衬片加热到预设的温度。

Description

用于控制具有双离合变速器的动力传动系的方法
技术领域
本发明涉及一种用于控制动力传动系的方法，所述动力传动系具有：内燃机；双离合变速器，所述双离合变速器具有第一子变速器和第二子变速器，所述第一子变速器和第二子变速器具有至少一个能切换的传动级；设置在内燃机和第一子变速器之间的第一摩擦离合器；以及设置在内燃机和第二子变速器之间的第二摩擦离合器，用于借助于经由摩擦离合器传递为此设定的发动机力矩来提供施加在双离合变速器的变速器输出端上的驱动系力矩。
背景技术
从DE102005036894A1中已知一种这种类型的具有并联变速器如双离合变速器的动力传动系，其中内燃机的发动机力矩借助于具有两个摩擦离合器的双离合器受控制地经由两个子变速器传递到变速器输出端上。在此，在断开的配属于子变速器的摩擦离合器中，切换并且规划传动级。双离合变速器的本来的切换在传动级接入两个子变速器中时通过所谓的、例如由WO2007/124710A1中已知的重叠切换实现，其中传递力矩的子变速器的闭合的摩擦离合器断开并且另一子变速器的断开的摩擦离合器交叉地闭合。在此，摩擦离合器在其传递能力方面设计为，在摩擦离合器完全闭合时至少能够传递最大发动机力矩。在此，在使用寿命期间持续地确定或估算发动机力矩和摩擦离合器的离合器力矩。如果确定例如由于摩擦衬片的先前损坏，用于施加的发动机力矩的传递能力不再是足够的，那么将发动机力矩限定为还能经由所涉及的摩擦离合器传递的离合器力矩。这在具有受限制地工作的摩擦离合器的子变速器运行时造成动力传动系的功率损耗。
发明内容
本发明的目的是，改进用于运行具有双离合变速器的动力传动系的方法，所述双离合变速器具有子变速器的受限制地工作的摩擦离合器。
所述目的通过权利要求1的方法的特征组合实现。其从属权利要求描述权利要求1的方法的有利的实施方式。
提出的方法用于控制动力传动系，所述动力传动系具有：内燃机；双离合变速器，所述双离合变速器具有的第一子变速器和第二子变速器，所述第一子变速器和第二子变速器具有至少一个能切换的传动级；设置在内燃机和第一子变速器之间的第一摩擦离合器以及设置在内燃机和第二子变速器之间的第二摩擦离合器，用于借助于经由摩擦离合器传递为此设定的发动机力矩来提供施加在双离合变速器的变速器输出端上的驱动系力矩。为了在具有先前损坏的摩擦衬片的摩擦离合器在其功能方面受限制时继续运行动力传动系，在经由第一摩擦离合器传递第一离合器力矩的情况下，依据第二摩擦离合器的第二摩擦衬片的当前温度和摩擦系数，将第二摩擦离合器在传动级接入第二子变速器中的情况下滑动地施加并且将摩擦衬片加热到预设的温度。
在此确定，例如由于过度加热而先前损坏的摩擦衬片在低的温度下、例如在低于摩擦离合器的运行温度的温度下具有比在运行温度的范围中的温度下更低的摩擦系数。在此，通过加热先前损坏的摩擦衬片能够在另一子变速器运行期间通过滑动地操作另一子变速器的功能受损害的摩擦离合器将摩擦衬片优选在动力传动系的低负荷和部分负荷阶段中再生。
在此，证实为有利的是，在加热第二摩擦衬片期间，借助于经由摩擦离合器传递的离合器力矩的分配，将驱动系力矩分别在联接到子变速器中的一个传动级中保持恒定。由此，摩擦衬片的再生能够基本上不被驾驶员和可能的乘客察觉地进行，因为不能发觉功率损耗。也就是说，经由两个摩擦离合器传递部分力矩，所述部分力矩的总和得出驱动系力矩。在此，能够通过提高发动机力矩来补偿在为了加热先前损坏的摩擦衬片而滑动地运行的第二摩擦离合器上的损失力矩。损失力矩例如能够由要再生的摩擦衬片上的放热等构成。
为了使滑动地运行的摩擦离合器能够不借助于其他的构件抵抗负荷，有利地在具有功能受损的摩擦离合器的子变速器中同样接入传动级，所述传动级将施加在滑动地运行的摩擦离合器上的离合器力矩传递到变速器输出端上进而提供驱动系力矩的部分值。为了保持所述驱动系力矩恒定，在加热先前损坏的摩擦衬片期间，在考虑接入子变速器中的传动级的传动比的情况下，依据施加在第二摩擦离合器上的第二离合器力矩地减少第一离合器力矩。
如果为了加热先前损坏的摩擦片衬片将第二摩擦离合器滑动地设定到预设的离合器力矩上，那么依据在第二子变速器上施加的损失力矩减少施加在变速器输出端上的驱动系力矩。为了保持驱动系力矩恒定，因此优选地依据在第二子变速器中的损失力矩提高发动机力矩。为此，能够相应地提高第一摩擦离合器的要传递的离合器力矩。还证实为有利的是，在加热摩擦衬片期间依据在第二子变速器中接入的传动级提高发动机力矩。在此，在加热摩擦衬片期间在第二子变速器中设有下述传动级，所述传动级具有与在第一子变速器中接入的传动级的传动比相比更大的传动比。
在不考虑可能存在的驱动系损耗、摩擦、效率限制等的情况下，这在例如100Nm的驱动系力矩下例如造成参与的力矩的下述设定：在断开第二摩擦离合器时，第一摩擦离合器在恒定的行驶中传递100Nm。如果在驱动系力矩恒定的情况下为了将先前损坏的摩擦片衬片再生或加热，第二摩擦离合器闭合以20Nm的离合器力矩滑动传递，那么在双离合变速器的变速器输出端上在传动比为1.5时仅13Nm是有效的。因此，依据接入的传动级将发动机力矩提高到87Nm，使得例如传递最大或最小87Nm的第一摩擦离合器将与100Nm的差值传递到变速器输出端上进而驱动系力矩与在第二摩擦离合器上的加热过程无关地保持不变。
还证实为有利的是，在第一摩擦离合器的传递能力受限制时超过传递能力的要传递的发动机力矩通过由第二摩擦离合器提供的离合器力矩传递。以这种方式，能够在例如一个或多个摩擦衬片先前损坏的情况下基本上完全地传递一个或两个摩擦离合器的受限制的传递性能。
不言而喻，以相应的方式能够进行第一摩擦离合器的第一摩擦衬片的加热，其中在第二子变速器中的动力传动系的运行期间，第一子变速器的功能受损害的第一摩擦离合器相应地滑动地运行。

Claims (7)

1.一种用于控制动力传动系的方法，所述动力传动系具有：内燃机；双离合变速器，所述双离合变速器具有第一子变速器和第二子变速器，所述第一子变速器和第二子变速器具有至少一个能切换的传动级；设置在所述内燃机和所述第一子变速器之间的第一摩擦离合器以及设置在所述内燃机和所述第二子变速器之间的第二摩擦离合器，用于借助于经由所述摩擦离合器传递为此设定的发动机力矩来提供施加在所述双离合变速器的变速器输出端上的驱动系力矩，
其特征在于，在经由所述第一摩擦离合器传递第一离合器力矩的情况下，依据所述第二摩擦离合器的第二摩擦衬片的当前温度和摩擦系数，将所述第二摩擦离合器在传动级接入所述第二子变速器中的情况下滑动地施加并且将所述摩擦衬片加热到预设的温度。
2.根据权利要求1所述的方法，其特征在于，在加热所述第二摩擦衬片期间，借助于经由所述摩擦离合器传递的离合器力矩的分配，将所述驱动系力矩在分别联接到所述子变速器中的一个传动级时保持恒定。
3.根据权利要求2所述的方法，其特征在于，在加热期间在考虑接入所述子变速器中的传动级的传动比的情况下，依据施加在所述第二摩擦离合器上的第二离合器力矩减少所述第一离合器力矩。
4.根据权利要求2或3所述的方法，其特征在于，为了保持所述驱动系力矩恒定，依据在所述第二子变速器中的损失力矩提高所述发动机力矩。
5.根据权利要求4所述的方法，其特征在于，在加热所述摩擦衬片期间依据所接入的传动级来提高所述发动机力矩。
6.根据权利要求1至5中任一项所述的方法，其特征在于，在加热所述摩擦衬片期间，在所述第二子变速器中设有下述传动级，所述传动级具有与接入在所述第一子变速器中的传动级的传动比相比更大的传动比。
7.根据权利要求1至6中任一项所述的方法，其特征在于，在所述第一摩擦离合器的传递能力受限制时，超过所述传递能力的要传递的发动机力矩通过由所述第二摩擦离合器提供的离合器力矩传递。
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