CN104724100B - 控制混合动力车辆的扭矩的系统和方法 - Google Patents
控制混合动力车辆的扭矩的系统和方法 Download PDFInfo
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- B60K6/20—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
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
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Abstract
一种控制混合动力车辆的扭矩的系统,包括动力源,所述动力源包括发动机和电动机。在发动机和电动机之间设置发动机离合器。行驶信息检测器检测行驶需求扭矩。牵引控制器控制提供给制动器的油压,以避免车轮滑转,并且当检测到车轮滑转时,向车辆控制器请求扭矩减小控制。车辆控制器控制发动机离合器的接合,以便以混合动力电动车辆(HEV)模式行驶,其中车辆控制器确定发动机和电动机的输出扭矩,以便根据扭矩减小控制执行扭矩减小控制,并且当扭矩减小控制的请求被解除时,车辆控制器设定发动机和电动机的扭矩恢复的梯度,并应用所述梯度以依循行驶需求扭矩。
Description
技术领域
本发明涉及混合动力车辆。更具体地,本发明涉及一种控制混合动力车辆的扭矩的系统和方法,所述系统和方法在牵引力控制系统(TCS)的扭矩减小控制被解除时,可通过以恒定的扭矩恢复梯度控制发动机和电动机,维持扭矩的连续性而不产生扭矩阶跃。
背景技术
按照提高车辆燃油效率的持续需求和各国对尾气排放的规定,对环保车辆的需求已有所增长,混合动力车辆和燃料电池车辆已成为满足这种需求的备选方案。尽管混合动力车辆可能不同于燃料电池车辆和电动车辆,不过,这里把混合动力车辆定义成具备一个或多个电池,以利用保存在电池中的能量作为车辆的驱动动力的车辆,包括普通电动车辆和燃料电池车辆。
混合动力车辆具有作为动力源的发动机和电动机。混合动力车辆的最佳输出扭矩取决于如何根据行驶状态组合和操作发动机和电动机。混合动力车辆可以是安装变速器电气装置(TMED)式混合动力车辆,或者安装飞轮电气装置(FMED)式混合动力车辆。
在混合动力车辆行驶时,如果驱动轮发生车轮滑转,那么牵引力控制系统(TCS)向通过网络连接的车辆控制器发送扭矩减小控制的请求,以减小发动机和电动机的扭矩。响应于来自TCS的请求,车辆控制器比较当前输出扭矩和由TCS请求的扭矩,以确定扭矩减小控制的执行条件,并设定扭矩减小值。车辆控制器随后减小发动机和电动机的输出扭矩,防止发生车轮滑转,以便稳定运转。
当根据车辆控制器的扭矩减小控制不发生车轮滑转时,TCS向车辆控制器发送解除扭矩减小控制的请求。响应于来自TCS的解除请求,车辆控制器将发动机和电动机的输出扭矩恢复到行驶需求扭矩。
当包括一个动力源的车辆中解除TCS的扭矩减小控制时,由于可以所述一个动力源的输出扭矩可被平顺地改变,因此可避免输出扭矩的急剧变化。然而,在其中运行两个或者更多的动力源、比如发动机和电动机的混合动力车辆中,当两个动力源恢复行驶需求扭矩时,由于在这两个动力源之间会出现扭矩需求和响应性能方面的阶跃型差异,因此起动线性会恶化,从而出现突然的冲击。
另外,在包括两个或者更多的动力源的车辆中,当解除TCS的扭矩减小控制,并且最后操作的动力源的输出扭矩急剧改变时,即使行驶需求扭矩的总和相同,实际输出扭矩也会随着每个动力源的动态特性而不同,从而使驾驶性能恶化。
在背景技术部分中公开的以上信息仅用于增进对本发明的背景的理解,因此可能包含不构成本领域普通技术人员公知的现有技术的信息。
发明内容
本发明提供一种控制混合动力车辆的扭矩的系统和方法,所述系统和方法具有以下优点:当牵引力控制系统(TCS)的扭矩减小控制被解除时,通过以恒定的扭矩恢复梯度控制发动机和电动机,维持扭矩的连续性而不产生扭矩阶跃。
根据本发明的示例性实施例,控制混合动力车辆的扭矩的系统包括动力源,所述动力源包括发动机和电动机。在发动机和电动机之间设置发动机离合器。行驶信息检测器被配置成检测行驶需求扭矩。牵引控制器被配置成控制提供给制动器的油压,以避免车轮滑转,并且还被配置成,当检测到车轮滑转时,向车辆控制器请求扭矩减小控制。车辆控制器被配置成控制发动机离合器的接合,以便以混合动力电动车辆(HEV)模式行驶,其中车辆控制器确定发动机和电动机的输出扭矩,以便根据由牵引控制器请求的扭矩减小控制执行扭矩减小控制,并且当扭矩减小控制的请求被解除时,车辆控制器设定发动机和电动机的扭矩恢复梯度,并应用所述梯度以依循行驶需求扭矩。
车辆控制器可通过应用所述梯度,维持发动机和电动机的输出扭矩的连续性,以防止出现输出扭矩的阶跃。
根据本发明的另一个示例性实施例,控制混合动力车辆的扭矩的方法包括确定发动机和电动机的输出扭矩,根据行驶需求扭矩使混合动力车辆以混合动力电动车辆(HEV)模式行驶。当牵引控制器请求扭矩减小控制时,控制发动机和电动机的输出扭矩。当牵引控制器请求解除扭矩减小控制时,设定发动机和电动机的扭矩恢复的梯度。利用所述梯度恢复发动机和电动机的输出扭矩,并且依循行驶需求扭矩。
所述方法还包括,当发动机和电动机的输出扭矩被恢复时,维持发动机和电动机的输出扭矩的连续性,以防止出现输出扭矩的阶跃。
根据本发明的示例性实施例,由于能够在解除TCS的扭矩减小控制时,维持来自具有不同响应性能的发动机和电动机的扭矩的连续性,因此可以改善驾驶性能。
附图说明
图1表示根据本发明示例性实施例的控制混合动力车辆的扭矩的系统的示意图。
图2表示根据本发明示例性实施例的控制混合动力车辆的扭矩的方法的流程图。
图3是说明本发明的示例性实施例的操作的示图。
具体实施方式
下面参考表示本发明示例性实施例的附图,更详细地说明本发明。
本领域的技术人员会认识到,可按各种不同的方式修改说明的实施例,所有这些方式都不脱离本发明的精神或范围。与本说明无关的各个部分将被省略,以清楚地说明本发明,说明书中,相同的元件将用相同的附图标记表示。另外,为了便于说明,附图中示出的各个结构被随意地表示,不过本发明并不局限于此。
图1表示根据本发明示例性实施例的控制混合动力车辆的扭矩的系统的示意图。参见图1,根据本发明示例性实施例的系统包括行驶信息检测器101、车辆控制器102、逆变器103、电池104、电池管理器105、牵引控制器106、电动机107、发动机108、混合式起动机和发动机(HSG)109、发动机离合器110、变速器111和车轮200。
在混合动力车辆行驶期间,行驶信息检测器101向车辆控制器102提供行驶信息,包括车速、档位、加速踏板的位移和制动踏板的位移。车辆控制器102可被称为混合控制器。车辆控制器102是最高控制器,完全控制连接到网络的各种控制器(未图示)。车辆控制器102根据行驶需求扭矩、电池104的荷电状态(SOC)等等,设定发动机108和电动机107的输出扭矩,并且控制总的输出扭矩,以便以效率最佳的混合动力电动车辆(HEV)模式行驶。
当牵引控制器106请求扭矩减小控制时,车辆控制器102从当前输出扭矩中减去扭矩减小控制的请求扭矩,以便设定发动机108和电动机107的减小扭矩,并控制发动机108和电动机107的运转,以减小输出扭矩。换句话说,车辆控制器102执行预置控制,防止车轮滑转,以稳定行驶。
在车辆控制器102针对发动机108和电动机107的输出扭矩控制减小控制的时候,当牵引控制器106请求的扭矩减小控制被解除时,车辆控制器102设定恢复的梯度,以便将发动机108和电动机107的扭矩恢复到行驶需求扭矩。车辆控制器102利用设定的恢复梯度恢复发动机108和电动机107的扭矩,从而在防止发生扭矩阶跃的同时,依循行驶需求扭矩。当将发动机108和电动机107的输出扭矩恢复到行驶需求扭矩时,车辆控制器102根据行驶需求扭矩执行对发动机108和电动机107的输出扭矩的正常控制。
逆变器103具备多个电功率开关,并且根据从车辆控制器102传送的控制信号,将直流(DC)电功率逆变成3相交流(AC)电功率,以便运转电动机107。逆变器103的所述多个电功率开关可包括绝缘栅双极型晶体管(IGBT)、金属氧化物半导体场效应晶体管(MOSFET)、场效应晶体管(FET)、晶体管和继电器中的至少一种。逆变器103包括保护电路单元,所述保护电路单元监控电力功率的流动,并且当因诸如碰撞和雷击之类的各种原因而使过电压或过电流流入动力源时,保护混合动力车辆中的整个系统和保护乘客安全,防止高电压的伤害。
电池104由多个单元电池构成,用以保存高电压,以便向电动机107供给电压。电池管理器105通过检测电流、电压和处在工作范围内的单元电池的温度来管理SOC,并通过控制电池104的充电/放电电压,避免由低于临界电压的过放电或高于临界电压的过充电而引起的寿命缩短。
当检测到驱动轮中的车轮滑转时,牵引控制器106通过调节器(未图示)控制提供给制动器缸的油压,并向通过网络与之相连的车辆控制器102发送扭矩减小控制的请求,以使得发动机108和电动机107的输出扭矩可被减小。电动机107由从逆变器103施加的3相AC电压操作,以产生扭矩,起到动力产生器的作用,并且在滑行时将再生能量提供给电池104。
当发动机108被启动时,其作为动力源输出第一动力。HSG 109作为起动机或发电机运行,其响应于来自车辆控制器102的控制信号启动发动机108,并在发动机108保持运转的时候,通过作为发电机运行而发电,并通过逆变器103将产生的电力作为充电电压提供给电池104。
发动机离合器110被布置在发动机108和电动机107之间,以便能够提供以电动车辆(EV)模式和HEV模式行驶。变速器111是自动变速器或者无阶跃速器(CVT),通过利用液压操作接合元件和解离元件,换档到期望的档位。
控制根据本发明具有包括上述功能的构造的混合动力车辆的扭矩的操作通过如下所述实现。图2是根据本发明的示例性实施例的控制混合动力车辆的扭矩的方法的流程图。
本发明示例性实施例适用的混合动力车辆在步骤S101以混合动力电动车辆(HEV)模式行驶的时候,在步骤S102和S103,车辆控制器102根据从行驶信息检测器101供给的行驶需求扭矩,设定发动机108和电动机107的各自输出扭矩,以控制总输出扭矩。车辆控制器102如上所述基于发动机108和电动机107各自设定的输出扭矩控制总输出扭矩的时候,在步骤S104,车辆控制器102判定是否由牵引控制器106请求了扭矩减小控制。
当由牵引控制器106请求了扭矩减小控制时,在步骤S105,车辆控制器102从当前输出扭矩中减去扭矩减小控制的请求扭矩,以设定发动机108和电动机107的各自减小扭矩,并在步骤S106,应用所设定的各自减小扭矩,并基于所应用的减小扭矩执行扭矩减小控制,从而防止发生车轮滑转,以稳定行驶。在车辆控制器针对发动机108和电动机107的各自输出扭矩执行扭矩减小控制的时候,在步骤S107,车辆控制器102判定牵引控制器106是否请求解除扭矩减小控制。
当牵引控制器106请求解除扭矩减小控制时,在步骤S108,车辆控制器102设定恢复的梯度,将发动机108和电动机107的扭矩恢复到行驶需求扭矩。在步骤S109,车辆控制器102利用在步骤S108设定的恢复梯度,如图3中所示恢复发动机108和电动机107的输出扭矩,从而在防止出现输出扭矩的阶跃的同时,依循行驶需求扭矩。在通过应用和利用恢复梯度维持输出扭矩的连续性的状态下,当发动机108和电动机107的输出扭矩在步骤S110被恢复到行驶需求扭矩时,在步骤S111,车辆控制器102根据行驶需求扭矩正常控制发动机108和电动机107的输出扭矩。
尽管结合目前认为可实施的示例性实施例对本发明进行了说明,但应该理解本发明并不局限于公开的实施例,相反,本发明意图覆盖各种修改和等同物。
Claims (3)
1.一种控制混合动力车辆的扭矩的系统,包括:
动力源,其包括发动机和电动机;
发动机离合器,其设置在所述发动机和所述电动机之间;
行驶信息检测器,其被配置成检测行驶需求扭矩;
牵引控制器,其被配置成控制提供给制动器的油压,以防止车轮滑转,并且其被配置成,当检测到车轮滑转时,向车辆控制器请求扭矩减小控制;以及
车辆控制器,其被配置成控制所述发动机离合器的接合,以便以混合动力电动车辆(HEV)模式行驶,
其中所述车辆控制器根据来自所述牵引控制器的扭矩减小控制的请求,确定所述发动机和所述电动机的扭矩,以便执行所述扭矩减小控制,并且当所述扭矩减小控制的请求被解除时,所述车辆控制器设定所述发动机和所述电动机的扭矩恢复的梯度,并应用所述梯度以维持所述发动机和所述电动机的输出扭矩的连续性并依循所述行驶需求扭矩。
2.一种控制混合动力车辆的扭矩的方法,包括以下步骤:
根据行驶需求扭矩确定发动机和电动机的输出扭矩,以便使所述混合动力车辆以混合动力电动车辆(HEV)模式行驶;
当由牵引控制器请求扭矩减小控制时,控制所述发动机和所述电动机的输出扭矩;
当由所述牵引控制器请求解除所述扭矩减小控制时,设定所述发动机和所述电动机的扭矩恢复的梯度;以及
利用所述梯度恢复所述发动机和所述电动机的输出扭矩,并且维持所述发动机和所述电动机的输出扭矩的连续性并依循所述行驶需求扭矩。
3.一种控制混合动力电动车辆(HEV)的扭矩的系统,包括:
动力源,其包括发动机和电动机,
发动机离合器,其被设置在所述发动机和所述电动机之间,
牵引控制器,其被配置成控制车轮滑转,
车辆控制器,其被配置成控制所述发动机离合器的接合,以便以HEV模式行驶,
其中所述车辆控制器根据预设指令工作,以便根据权利要求2所述的方法,在扭矩减小控制被解除时,维持具有不同响应性能的动力源间扭矩的连续性。
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