CN106553640B - 混合动力车辆的倒车控制方法 - Google Patents
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Abstract
公开了一种混合动力车辆的倒车控制方法。该倒车控制方法包括:如果换档杆位于R档位置,确认车辆的驱动模式;根据驱动模式的确认结果,如果驱动模式是电动机驱动模式,将道路表面的倾斜度与预定倾斜度进行比较;以及,根据倾斜度的比较结果,如果确定道路表面的倾斜度低于预定倾斜度时,接合第一档位作为换挡档位,并且在反方向上驱动电动机。
Description
技术领域
本公开涉及一种混合动力车辆的倒车控制方法。
背景技术
本部分的说明仅用于提供与本发明有关的背景信息,并且不构成现有技术。
一般地,双离合变速器(DCT)包括多个前进档位和一个倒车档位,并且控制偶数离合器以便接合R档齿轮来执行倒车。这里,在预先接合第一档位的条件下释放奇数离合器,因此减少在使用R档的行驶过程中产生的齿轮侧隙(gear backlash)噪声。进一步地,在向前行驶过程中,R档齿轮将被释放。
因此,在低速R-D或是D-R的突然倾斜行驶的过程中,第一档位和R档位被频繁地接合/释放,因此将引起诸如在驱动响应中的延迟以及过量的噪声的问题。具体地,对于混合动力车辆而言,驾驶员在EV模式中听见更多的噪声。
为了解决这些问题,在现有技术中,将使用不使用R档的而是在接合第一档位时将电动机在反方向驱动来执行倒车的技术(原文)。
然而,如果在倒车过程中电动机的动力或是电池的充电状态(SOC)不足,EV模式(例如,仅通过电动机的驱动模式)应当转换为HEV模式(例如,通过电动机和发动机驱动)。这里,在将电动机反向驱动变换为电动机正向驱动的过程中,车辆将发生打滑。
发明内容
本公开提供了一种混合动力车辆的倒车控制方法,其中,根据混合动力车辆的驱动模式以及道路表面的倾斜度来控制第一档位的接合以及电动机在反方向上的驱动,从而抑制或是防止车辆的滑移。
用于混合动力车辆的行驶控制方法的本公开包括:确认步骤,如果换档杆位于R档位置,则确认车辆的驱动模式;比较步骤,作为驱动模式的确认结果,如果驱动模式是电动机模式,则将道路表面的倾斜度与预定倾斜度进行比较;以及,接合步骤,作为倾斜度的比较结果,如果道路表面倾斜度低于预定倾斜度,则接合第一档位作为档位,并且在反方向上驱动电动机。
作为驱动模式的确认结果,如果驱动模式不是电动机驱动模式,则可接合R档齿轮作为换挡档位。
作为倾斜度的比较结果,如果道路表面倾斜度不低于预定倾斜度,则可接合R档齿轮作为换挡档位。
倒车控制方法可进一步地包括:根据倾斜度的比较结果,如果道路表面倾斜度低于预定倾斜度,则将高压电池的SOC与预定值进行比较,并且,根据高压电池的SOC与预定值的比较结果,如果高压电池的SOC超过预定值,则执行电动机的反方向驱动。
根据高压电池的SOC与预定值进行比较的结果,如果高压电池的SOC不超过预定值,则将接合R档齿轮作为档位。
当接合R档齿轮时,电动机将在正向方向上驱动。
本公开的更多的应用领域将从本文所提供的描述中显而易见。应当理解的是,描述和特定示例仅用于示例性目的,并不意在限制本发明的范围。
附图说明
为了更好地理解本发明,现在将参考附图描述以示例方式给出的本发明的各种形式,其中:
图1是示出混合动力车辆的倒车控制方法的流程图;以及
图2是示出混合动力车辆的倒车控制装置的视图。
本文所描述的附图仅用于示例性目的,并且其不旨在以任何方式限制本发明的范围。
具体实施方式
下文描述本质上仅为示例性的而不旨在限制本发明的范围、应用或是用途。应当理解的是,贯穿附图,相应的附图标记指代相同或相应的部件和特征。
在下文中,将参考附图描述根据本发明的一个实施例的混合动力车辆的倒车控制方法。
图1是示出混合动力车辆的倒车控制方法的流程图,并且图2是示出混合动力车辆的倒车控制装置的视图。
参考图1和图2,混合动力车辆的倒车控制方法可包括:如果换档杆113位于R档位置上(操作S10),确认车辆的驱动模式;你驱动模式确认(操作S10)的结果,如果驱动模式是电动机驱动模式,则将道路表面的倾斜度与预定倾斜度进行比较(操作S20);以及,作为倾斜度(操作S20)的比较结果,如果道路表面倾斜度低于预定倾斜度,则接合第一档位,并且在反方向上驱动电动机105(操作S40)。
即,在本发明的倒车控制方法中,在通过第一档位的接合和在反方向上驱动电动机来执行车辆的倒车前,可判断混合动力车辆的驱动模式从电动机驱动模式切换至发动机驱动模式的可能性,因此,能够抑制或是防止车辆的滑移,以及抑制或是防止由于车辆的驱动模式的转换导致的动力切断的感觉的产生。
更具体地,如果感测到换档杆113的位置处于R档位置,控制器110确定车辆的驱动模式是否是电动机驱动模式(操作S10)。如果车辆的驱动模式是电动车辆(EV)模式,则车辆仅使用电动机105进行驱动,并且因此,通过接合第一档位作为变速器109的奇数档位以及随后在反方向上驱动电动机105,车辆可在后退方向上被驱动,从而减少由于换档产生的噪声。在此种情况下,尽管变速杆113从R档位置改变至D,由于第一档位处于接合状态,可通过使电动机105在正向方向上驱动来执行向前行驶,因此在不换档的情况下,可执行突然倾斜行驶。因此在突然倾斜行驶情况下可抑制或防止噪声的产生。
在另一方面,作为驱动模式确认(操作S10)的结果,如果车辆的驱动模式不是电动机驱动模式,则将接合R档齿轮作为档位。例如,如果车辆的驱动模式是HEV模式或是发动机模式,则控制器110使用发动机101驱动车辆,并且因此,将不执行通过第一档位的接合而进行的倒车。反而,可通过变速器109的偶数换挡档位接合R档齿轮。
更进一步地,作为驱动模式确认(操作S10)的结果,如果车辆的驱动模式是电动机驱动模式,则控制器110可将道路表面的倾斜度值与预定倾斜度值进行比较(操作S20)。此处,控制器110可通过倾斜度传感器115感测道路表面倾斜度值。
如果车辆在陡峭倾斜状态的道路上持续地驱动在EV模式中,则由于电动机105的输出不足,将导致车辆的驱动模式可转换至HEV模式或是发动机模式。在此种情况下,控制器110释放第一档位并且接合R档齿轮作为偶数换挡档位,并且这样的换档将向驾驶员提供动力切断的感觉,从而使驾驶员在行驶过程中感到不便。
因此,在需要倒车的情况中,仅当车辆的驱动模式是EV模式,并且道路表面倾斜度低于预定倾斜度时,控制器110接合第一档位并且随后在反方向驱动电动机105来执行倒车,因此减少噪声的产生。
在另一方面,作为倾斜度的比较(操作S20)的结果,如果道路表面的倾斜度不低于预定倾斜度,则将接合R档齿轮。即,在驱动在EV模式中的混合动力车辆中,如果道路表面的倾斜度不低于预定倾斜度,则由于电动机105的输出不足将导致发生驱动模式的转换的情况。因此,为了抑制或防止动力切断的感觉,以及抑制或防止由于变速器109的换档而导致的车辆的滑移,将从初始档位通过R档执行倒车。
此外,本发明的倒车控制方法可进一步地包括:作为倾斜度比较(操作S20)的结果,如果道路表面倾斜度低于预定倾斜度,将高压电池107的SOC与预定值进行比较(操作S30),并且,作为SOC的比较(操作S30)的结果,如果高压电池107的SOC超过预定值时,将执行在反方向上的电动机的驱动(操作S40)。
更具体地,如果在EV模式中车辆需要倒车,则控制器110将检查高压电池107的SOC以驱动电动机105。如果高压电池107的SOC不超过预定值,则由于在倒车过程中高压电池107的放电,将导致不能驱动电动机105,并且因此驱动模式将被改变。因此,仅当高压电池107的SOC超过预定值时,可接合第一档位,并且在反方向上驱动电动机105来执行倒车。
在另一方面。作为倾斜度对比(操作S30)的结果,如果高压电池107的SOC不超过预定值,则将接合R档齿轮。即,如果高压电池107的SOC不超过预定值,控制器110可抑制或是防止通过在反方向上驱动电动机105进行的车辆的倒车,因此可抑制或防止车辆的滑移以及在倒车过程中由于驱动模式的转换而导致的动力切断。
更进一步地,当接合R档齿轮时,电动机105可在正向方向上驱动。即,在确定车辆的驱动模式改变的可能性高时,在接合R档齿轮时可通过在正向方向上驱动电动机105来通过R档执行车辆的倒车。
在一个形式中,变速器109可以是包括多个离合器的DCT,离合器103可设置在发动机101和电动机105之间从而连接/断开发动机101和电动机105,并且控制器110可通过控制对应的离合器改变车辆的驱动模式。
从上文描述中显而易见的是,在车辆通过接合第一档位并且在反方向上驱动电动机进行倒车过程中,当车辆的驱动模式改变时,根据本发明混合动力车辆的倒车控制方法可抑制或是防止变速器档位的改变,因此抑制或是防止车辆的滑移并且降低动力传输的感觉。
更进一步地,可通过接合第一档位并且在反方向上驱动电动机执行车辆的倒车,因此减少由于突然倾斜行驶而导致的档位接合而产生的噪声,提高驾驶响应,抑制或是防止R档止步,并且改善电动机的再生制动。
尽管本发明的实施例为了示例性目的已被公开,但本领域的技术人员应当意识到的是,在不违背本发明的范围和精神的情况下,可做出各种修改、增添和替换。
Claims (8)
1.一种混合动力车辆的倒车控制方法,包括以下步骤:
确认步骤,当换档杆位于R档位置时,通过控制器确认车辆的驱动模式;
比较步骤,当所述确认步骤确定所述驱动模式是电动机驱动模式时,通过所述控制器,将道路表面的倾斜度值与预定倾斜度值进行比较;以及
接合步骤,当所述比较步骤确定所述道路表面的倾斜度值低于所述预定倾斜度值时,接合第一档位,并且在反方向上驱动电动机。
2.根据权利要求1所述的倒车控制方法,其中当所述确认步骤确定驱动模式不是电动机驱动模式时,接合R档齿轮。
3.根据权利要求2所述的倒车控制方法,其中当接合R档齿轮时,在正向方向上驱动所述电动机。
4.根据权利要求1所述的倒车控制方法,其中当所述比较步骤确定所述道路表面的倾斜度值不低于所述预定倾斜度值时,接合R档齿轮。
5.根据权利要求4所述的倒车控制方法,其中,当接合所述R档齿轮时,在正向方向上驱动所述电动机。
6.根据权利要求1所述的倒车控制方法,还包括:充电状态比较步骤,当所述比较步骤确定所述道路表面倾斜度值低于所述预定倾斜度值时,将高压电池的充电状态和预定值进行比较,
其中,当所述充电状态比较步骤确定所述高压电池的充电状态超过所述预定值时,在反方向上驱动所述电动机。
7.根据权利要求6所述的倒车控制方法,其中当所述充电状态比较步骤确定所述高压电池的充电状态不超过所述预定值时,接合R档齿轮。
8.根据权利要求7所述的倒车控制方法,其中,当接合所述R档齿轮时,在正向方向上驱动所述电动机。
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