CN106335505B - 学习混合动力电动车辆的发动机离合器的接触点的装置和方法 - Google Patents
学习混合动力电动车辆的发动机离合器的接触点的装置和方法 Download PDFInfo
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Abstract
本发明提供一种学习混合动力电动车辆的发动机离合器的接触点的装置和方法,其中当混合动力电动车辆行驶时,所述装置和方法基于发动机转矩的变化来学习发动机离合器的接触点。所述方法包括:确定换挡后是否需要发动机离合器结合,以及当换挡后需要发动机离合器结合时,确定基于混合动力电动车辆的行驶状态的学习条件是否被满足。当学习条件被满足时,增加发动机离合器的结合压力,并且比较基于发动机离合器所增加的结合压力的发动机转矩的变化量与预定值。当发动机转矩的变化量大于或等于预定值时,学习发动机离合器的接触点。
Description
相关申请交叉参考
本申请要求2015年7月8日向韩国知识产权局提交的韩国专利申请No.10-2015-0097012的优先权和权益,其全部内容以参考方式并入本申请。
技术领域
本发明涉及用于学习混合动力电动车辆的发动机离合器的接触点的装置和方法,并且更具体地,涉及在混合动力电动车辆行驶期间基于发动机转矩的变化来学习发动机离合器的接触点的学习混合动力电动车辆的发动机离合器的接触点的装置和方法。
背景技术
通常,混合动力电动车辆是由从燃料燃烧产生转矩的发动机和从电池产生转矩的电动机来进行驱动。当车辆由两种动力源即发动机和电动机进行驱动时,基于发动机和电动机如何被操作,混合动力电动车辆可具有最佳输出转矩。
在混合动力电动车辆中,为了将发动机的功率传输至驱动轴,发动机离合器安装在发动机和电动机之间。混合车辆基于发动机离合器是否被结合具有电动车辆(EV)模式和混合动力电动车辆(HEV)模式,其中EV模式利用电动机转矩提供车辆行驶,HEV模式利用发动机转矩与电动机转矩的总和来提供车辆行驶。混合动力电动车辆确定和学习用于稳定功率输送和迅速转矩响应的发动机离合器的接触点。
包括自动变速器的安装有变速器的电动设备(TMED)类型的混合动力电动车辆使用湿式发动机离合器,并且当换挡档位处于停车(P)档位或空挡(N)档位时,学习发动机离合器的接触点。然而,包括双离合变速器(DCT)的混合动力电动车辆使用干式发动机离合器,所以与湿式发动机离合器相比,频繁地学习发动机离合器的接触点是必要的。而且,应用于湿式发动机离合器的学习发动机离合器的接触点的常规方法可能不太精确。
上述在背景部分公开的信息仅用于对本公开的背景做进一步的理解,因此它可以包含对于该国本领域普通技术人员已知的不构成现有技术的信息。
发明内容
本发明提供用于学习混合动力电动车辆的发动机离合器的接触点的装置和方法,其具有在混合动力电动车辆行驶期间基于发动机转矩变化来学习发动机离合器的接触点的优点。
本发明的示例性实施例提供用于学习混合动力电动车辆的发动机离合器的接触点的方法,混合动力电动车辆包括连接到变速器上的电动机和经由发动机离合器选择性地连接到电动机的发动机,该方法可包括:确定换挡后是否需要发动机离合器结合;当换挡后需要发动机离合器结合时,确定基于混合动力电动车辆的行驶状态的学习条件是否被满足;当学习条件满足时,增加发动机离合器的结合压力;比较基于发动机离合器所增加的结合压力的发动机转矩的变化量与预定值;以及当发动机转矩的变化量大于或等于预定值时,学习发动机离合器的接触点。
考虑到电池的放电电力,当驾驶员的需求转矩大于或等于预定转矩,并且当前电动机速度小于或等于换挡后的目标速度时,换挡后需要发动机离合器结合。当电池充电状态(SOC)是在预定范围内、换挡状态处于驱动(D)档位,且混合动力电动车辆正在换挡时,满足学习条件。发动机离合器的结合压力可通过具有增加形式的信号等级(signal rating)而增加。该方法还可包括确定发动机速度与电动机速度是否同步;以及在学习发动机离合器的接触点之后,当发动机速度与电动机速度同步时,结合发动机离合器。
本发明的另一个示例性实施例提供用于学习混合动力电动车辆的发动机离合器的接触点的装置,混合动力电动车辆包括连接到变速器的电动机和通过发动机离合器选择性地连接到电动机的发动机,该装置可包括:驱动信息检测器,其配置成检测混合动力电动车辆的行驶状态;以及控制器,其配置成基于来自驱动信息检测器的信号来结合或释放发动机离合器。此外,控制器可配置成:当换挡后需要发动机离合器结合时,确定学习条件是否满足,并且当学习条件满足时,通过增加发动机离合器的结合压力来学习发动机离合器的接触点。
控制器还可配置成比较基于发动机离合器所增加的结合压力的发动机转矩的变化量与预定值,且当发动机转矩的变化量大于或等于预定值时,学习发动机离合器的接触点。考虑到电池的放电电力,当驾驶员的需求转矩大于或等于预定转矩,并且当前电动机速度小于或等于换挡后的目标速度时,控制器可配置成确定出换挡后需要发动机离合器结合。
更进一步,当电池充电状态(SOC)是在预定范围内、换挡状态处于D档位且混合动力电动车辆正在换挡时,控制器可配置成确定满足学习条件。然后控制器配置成通过具有增加形式的信号等级来增加发动机离合器的结合压力。发动机离合器可包括干式发动机离合器。在学习发动机离合器的接触点之后,当发动机速度与电动机速度同步时,控制器可配置成结合发动机离合器。
如上所述,根据本发明的示例性实施例,当混合动力电动车辆正在行驶时,发动机离合器的接触点可被学习,且发动机离合器的接触点的精确性可被提高。因此,发动机离合器的结合影响可被减小,从而提高混合动力电动车辆的驾驶性能。
附图说明
从结合附图的下面详细的描述中,本发明的目的、特征和优点将是更显然的,其中:
图1是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法所应用的混合动力系统的图。
图2是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的装置的方框图。
图3是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法的流程图。
具体实施方式
在下面详细的描述中,本发明的示例性实施例仅以示例的方式已经被示出和描述。本领域技术人员应该认识到,所述的示例性实施例可用各种不同的方式进行修改,其全部都不偏离本发明的精神或范围。
本文使用的术语仅出于说明具体实施方式的目的,而不意在限制本发明。如本文所使用的,单数形式“一个”、“一种”、“该”也意在包括复数形式,除非上下文中另外明确指明。还应当理解的是,在说明书中使用的术语“包括”和/或“包含”是指存在所述特征、整数、步骤、操作、元件和/或部件,但是不排除存在或添加一个或多个其他特征、整数、步骤、操作、元件、部件和/或其组合。如本文所使用的,术语“和/或”包括一个或多个相关所列项的任何和所有结合。
贯穿说明书,相同的附图标记指代相同的要素。
应该理解的是,本文中使用的术语“车辆”、“车辆的”或其他类似术语包括一般的机动车辆,其包括混合动力车辆、插电式混合动力电动车辆和其它替代燃料车辆(例如,燃料是从非石油资源中提炼出来的)。如本文所述,混合动力车是具有两种或多种动力源的车辆,例如同时具有汽油动力和电动力的车辆。
除非特别说明或从上下文中是显而易见的,如本文所用,术语“约”应理解为本领域中一个正常容差的范围,例如在平均值的2个标准差之内。“约”可以理解为在规定值的10%,9%,8%,7%,6%,5%,4%,3%,2%,1%,0.5%,0.1%,0.05%或0.01%内。除非在上下文中明确规定,否则本文提供的所有数值都被术语“约”修饰。
尽管示例性实施例被描述为使用多个单元来执行示例性进程,可以理解的是,上述示例性进程也可以由一个或多个模块或至少一个控制器/控制部件执行。此外,应该理解的是,术语控制器/控制单元指的是包括存储器和处理器的一个硬件设备,其配置成执行应该理解为其算法结构的一个或多个步骤。上述存储器被配置为存储该算法步骤,以及处理器被专门配置为执行该算法步骤以实现其在下面进一步描述的一个或多个进程。
此外,本发明的控制逻辑可被实施为计算机可读介质上的非暂时性计算机可读介质,该计算机可读介质包含由处理器、控制器/控制单元等执行的可执行程序指令。计算机可读介质的例子包括但不限于ROM、RAM、光盘(CD)-ROM、磁带、软盘、闪存盘、智能卡和光学数据存储设备。计算机可读记录介质也可以分布在网络耦接的计算机系统上,这样可以通过分布式方式例如通过远程服务器或控制器局域网络(CAN)存储和执行计算机可读介质。
下文中根据附图将详细描述本发明的示例性实施例。
图1是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法所应用的混合动力系统的图。为了更好的理解和易于描述,如图1所示的混合动力系统是本发明的示例性实施例。因此,根据本发明的示例性实施例,用于学习混合动力电动车辆的发动机离合器的接触点的方法不仅适用于如图1所示的混合动力系统,而且还适用于所有其他的混合动力系统。
如图1所示,根据本发明的示例性实施例,用于学习混合动力电动车辆的发动机离合器的接触点的方法所适用的混合动力系统可包括:混合动力控制单元(HCU)10、电子控制单元(ECU)12、电动机控制单元(MCU)14、变速器控制单元(TCU)16、发动机20、发动机离合器22、电动机24、变速器26和电池28。
HCU 10可配置成操作在混合动力电动车辆整体运行中互相交换信息的其它控制器(例如,控制单元),且因此,HCU 10可配置成通过与其它控制器合作来调节发动机20和电动机24的输出转矩。具体地,ECU 12可配置成基于发动机20的条件来操作发动机20,其中发动机20的条件可以是例如驾驶员的需求转矩、冷却剂温度和发动机转矩。MCU 14可配置成基于驾驶员的需求转矩、混合动力电动车辆的驱动模式和电池28的充电状态(SOC)条件来操作电动机24。TCU 16可配置成基于发动机20和电动机24的输出转矩以及再生制动量来操作变速器26,例如变速器26的速度比。
当发动机20启动时,发动机20可配置成输出功率作为动力源。发动机离合器22可设置在发动机20和电动机24之间以接收HCU 10的控制信号,且基于混合动力电动车辆的驱动模式来选择性地连接发动机20和电动机24。利用逆变器使电池28施加三相交流电流(AC)电压到电动机24,使得电动机24可运行以产生转矩,且电动机24可配置成操作为功率发电机以及在滑行模式下提供再生能量给电池28。
当输入转矩基于车辆速度和驱动条件来选择任何换挡齿轮以输出驱动力给驱动车轮且维持驱动时,变速器26可配置成提供由发动机离合器22的结合和释放确定出的电动机24输出转矩和发动机20输出转矩的总和。变速器26可以是包括多个行星齿轮组和多个摩擦元件的自动变速器(AT)或是包括多个同步器和致动器的双离合变速器(DCT),但是不限于此。电池28可包括多个单位元件,且可配置成支持用于提供电压给电动机24的高电压,例如,约400V或450V DC。
如上所述的混合动力系统对本领域技术人员是显而易见的,那么其详细说明将被省略。
图2是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的装置的方框图。如图2所示,根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的装置可包括发动机离合器22、驱动信息检测器30和控制器11,控制器可配置成操作发动机离合器22和驱动信息检测器30(例如,传感器)。
在下文将要描述的根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法中的过程可由每个控制器通过整合或拆分来执行。因此,为了方便描述,在本说明书和权利要求中,在混合动力电动车辆内设置的许多控制器都被称为控制器11。
本发明的实施例应用的混合动力电动车辆可包括至少一个发动机20和至少一个电动机24。此外,混合动力电动车辆可提供驱动模式,在该模式中,发动机20和电动机24作为动力源分开或同时操作。为了这个目的,发动机离合器可设置在发动机20和电动机24之间以选择性地连接发动机20和电动机24。具体地,在本发明的示例性实施例中,发动机离合器22可以是干式发动机离合器。
驱动信息检测器30可配置成检测混合动力电动车辆的行驶状态且可包括车辆速度传感器31、电动机速度传感器32、发动机速度传感器33和加速器踏板位置传感器(APS)34。车辆速度传感器31可配置成检测车辆的速度,且发送相应的信号至控制器11。电动机速度传感器32可配置成检测电动机24的旋转速度,且发送相应的信号至控制器11。发动机速度传感器33可配置成检测发动机20的旋转速度,且发送相应的信号至控制器11。
此外,加速器踏板位置传感器34可配置成持续检测加速器踏板的位置值,且发送监测信号至控制器11。当加速器踏板完全齿合时,加速器踏板的位置值可以是100%,且当加速器踏板分离(例如,没有压力施加给踏板)时,加速器踏板的位置值可以是0%。安装在进气管上的节流阀位置传感器(TPS)可以用于代替加速器踏板位置传感器34。因此,在本说明书和所附权利要求的范围中,加速器踏板位置传感器34可包括节流阀位置传感器,且加速器踏板的位置值可以理解为节流阀的开度值。
控制器11可配置成当换挡后需要发动机离合器结合时,确定学习条件是否满足,并且当学习条件满足时,通过增加发动机离合器的结合压力来学习发动机离合器22的接触点。控制器11还可配置成比较基于发动机离合器所增加的结合压力的发动机的转矩变化量与预定值,并且当发动机的转矩变化量大于或等于预定值时,学习发动机离合器的接触点。
此外,控制器11可配置成在学习发动机离合器22的接触点后,当发动机速度与电动机速度同步时,结合发动机离合器。为了这些目的,控制器11可实施为由预定程序操作的至少一个处理器,且预定程序可被编程以执行根据本发明实施例的用于学习混合动力电动车辆的发动机离合器的接触点方法的每一个步骤。本文描述的各种示例性实施例可以在记录介质内被实现,其中该记录介质可以通过使用例如软件、硬件或其组合来由计算机或相似设备读取。
根据硬件实施,本文描述的实施例可通过使用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑设备(PLD)、现场可编程门阵列(FPGA)、处理器、控制器、微控制器、微处理器和经设计以执行任何其他功能的电子单元中的至少一个来实施。
根据软件实施,诸如本实施例中描述的程序和功能的实施例可由分开的软件模块来实现。每一个软件模块都可执行本发明中描述的一个或多个功能和操作。软件编码可通过由适当的程序语言编写的软件应用程序来实现。
以下,根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法将参考图3被详细描述。
图3是示出根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法的流程图。如图3所示,根据本发明示例性实施例的用于学习混合动力电动车辆的发动机离合器的接触点的方法可以在步骤S100中基于来自驱动信息检测器30的信号开始确定换挡后是否需要发动机离合器结合。
当换挡前需要发动机离合器结合时,根据本发明示例性实施例的方法可以不学习发动机离合器的接触点。当在换挡前发动机离合器被结合时,发动机离合器22可被迅速结合以用于迅速功率输出。因此,当混合动力电动车辆行驶时,没有时间学习发动机离合器的接触点。此外,当在换挡后发动机离合器被结合时,发动机20可等待完成换挡,同时维持发动机速度。因此,当混合动力电动车辆行驶时,发动机离合器接触点可被学习。
换挡后是否需要发动机离合器结合可通过考虑电池的放电电力进而检测驾驶员的需求功率或需求转矩以及比较当前电动机速度与换挡后的目标速度而进行确定。换句话说,控制器11配置成:考虑电池放电电力,当驾驶员的需求转矩大于或等于预定转矩,并且当前电动机速度小于或等于换挡后的目标速度时,确定换挡后需要发动机离合器结合。例如,当因为驾驶员的需求转矩大于或等于预定转矩而执行降速换挡时,可增加电动机速度。发动机速度同步化跟随电动机速度并可由HSG调节,且因此电池的放电电力应该被考虑。
当在步骤S100中换挡后需要发动机离合器结合时,控制器11可配置成在步骤S110中确定基于混合动力电动车辆行驶状态的学习条件是否被满足。当电池充电状态(SOC)是在预定范围内、换挡状态是在D档位且混合动力电动车辆正在换挡时,学习条件可被确定为是满足的。例如,变速器的摩擦元件可重复执行接合且在D档位换挡期间释放,从而更迅速地产生空挡状态。此时,可学习发动机离合器的接触点。因此,当电池充电状态(SOC)是在预定范围内、换挡状态是在D档位,且混合动力电动车辆正在换挡时,控制器11可配置成确定出学习条件是满足的。
当在步骤S110中学习条件是满足的时,控制器11可配置成在步骤S120中增加发动机离合器的结合压力。发动机离合器的结合压力可由具有增加形式的信号等级而增加。例如,可以使用具有斜坡状单调递增或逐步增加的信号。当在步骤S120中发动机离合器的结合压力被增加时,控制器11可配置成在步骤S130中比较基于发动机离合器所增加的结合压力的发动机转矩的变化量与预定值。
当发动机离合器被结合时,发动机20可被维持在基本恒速中,以基于电动机和变速器的负载而改变发动机转矩。因此,当发动机转矩的变化量大于或等于预定值时,控制器11可配置成在步骤S140中学习发动机离合器的接触点。之后,控制器11可配置成在步骤S150中确定发动机速度与电动机速度是否同步,且当在步骤S160中发动机速度与电动机速度同步时,结合发动机离合器22。
如上所述,根据本发明的实施例,在混合动力电动车辆行驶期间发动机离合器的接触点可被学习,且发动机离合器接触点的精确性可被提高。因此,发动机离合器的结合影响可被减小,从而提高混合动力电动车辆的驾驶性能。
虽然本发明已经接合目前被认为是示例性的实施例进行了描述,但是应该理解本发明并不限于所公开的示例性实施例。相反,本发明旨在覆盖包括在所附权利要求的精神和范围内的各种修改和等效配置。
Claims (10)
1.一种用于学习混合动力电动车辆的发动机离合器的接触点的方法,其中所述车辆具有连接至变速器的电动机和经由发动机离合器选择性地连接至所述电动机的发动机,所述方法包括以下步骤:
由控制器确定换挡后是否需要发动机离合器结合;
当换挡后需要发动机离合器结合时,由所述控制器确定基于所述混合动力电动车辆的行驶状态的学习条件是否被满足;
当满足所述学习条件时,由所述控制器增加所述发动机离合器的结合压力;
由所述控制器比较基于所述发动机离合器所增加的结合压力的发动机转矩的变化量与预定值;以及
当所述发动机转矩的变化量大于或等于所述预定值时,由所述控制器学习发动机离合器的接触点,
其中考虑电池的放电电力,当驾驶员的需求转矩大于或等于预定转矩,并且当前电动机速度小于或等于换挡后的目标速度时,换挡后需要发动机离合器结合。
2.如权利要求1所述的方法,其中当电池充电状态(SOC)是在预定范围内、换挡状态处于驱动(D)档位并且混合动力电动车辆正在换挡时,满足所述学习条件。
3.如权利要求1所述的方法,其中所述发动机离合器的结合压力由具有增加形式的信号等级而增加。
4.如权利要求1所述的方法,所述方法还包括以下步骤:
在学习所述发动机离合器的接触点后,由所述控制器确定发动机速度与电动机速度是否同步;以及
当所述发动机速度与所述电动机速度同步时,由所述控制器结合所述发动机离合器。
5.一种用于学习混合动力电动车辆的发动机离合器的接触点的装置,其中所述车辆具有连接至变速器的电动机和经由发动机离合器选择性地连接至所述电动机的发动机,所述装置包括:
驱动信息检测器,其配置成检测所述混合动力电动车辆的行驶状态;以及
控制器,其配置成基于来自所述驱动信息检测器的信号来结合或释放所述发动机离合器,
其中所述控制器配置成:当换挡后需要发动机离合器结合时,确定学习条件是否满足,并且当所述学习条件满足时,通过增加所述发动机离合器的结合压力来学习所述发动机离合器的接触点;
其中所述控制器配置成比较基于所述发动机离合器所增加的结合压力的发动机的转矩变化量与预定值,且当所述发动机转矩的变化量大于或等于所述预定值时,学习所述发动机离合器的接触点;以及
其中考虑电池的放电电力,当驾驶员的需求转矩大于或等于预定转矩,并且当前电动机速度小于或等于换挡后的目标速度时,所述控制器配置成确定出换挡后需要发动机离合器结合。
6.如权利要求5所述的装置,其中当电池充电状态(SOC)是在预定范围内、换挡状态处于驱动(D)档位并且所述混合动力电动车辆正在换挡时,所述控制器配置成确定满足所述学习条件。
7.如权利要求5所述的装置,其中所述控制器配置成通过具有增加形式的信号等级来增加所述发动机离合器的结合压力。
8.如权利要求5所述的装置,其中所述发动机离合器包括干式发动机离合器。
9.如权利要求5所述的装置,其中在学习所述发动机离合器的接触点之后,当发动机速度与电动机速度同步时,所述控制器配置成结合所述发动机离合器。
10.如权利要求5所述的装置,其中所述驱动信息检测器包括:车辆速度传感器、电动机速度传感器、发动机速度传感器以及加速器踏板位置传感器(APS)。
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