WO2023005982A1 - 八挡双离合变速器的倒挡控制方法 - Google Patents

八挡双离合变速器的倒挡控制方法 Download PDF

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WO2023005982A1
WO2023005982A1 PCT/CN2022/108289 CN2022108289W WO2023005982A1 WO 2023005982 A1 WO2023005982 A1 WO 2023005982A1 CN 2022108289 W CN2022108289 W CN 2022108289W WO 2023005982 A1 WO2023005982 A1 WO 2023005982A1
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gear
speed
reverse
zero
reverse gear
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PCT/CN2022/108289
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English (en)
French (fr)
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刘君祺
付超
白秀超
刘彦超
王伟
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中国第一汽车股份有限公司
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Publication of WO2023005982A1 publication Critical patent/WO2023005982A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • 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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0202—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 characterised by the signals used the signals being electric
    • F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • 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
    • F16H61/04—Smoothing ratio shift

Definitions

  • the present application relates to the technical field of automobiles, for example, to a reverse gear control method of an eight-speed dual-clutch transmission.
  • An eight-speed dual-clutch transmission is one of the transmissions.
  • the driver realizes the shifting of the car by operating the eight-speed dual-clutch transmission.
  • the driver When the car is running, the driver will have a reverse gear demand.
  • the driver When the driver performs a reverse gear operation, there may be rattling noise when the reverse gear is engaged.
  • the rattling noise will affect the driving experience of the driver and passengers; and the rattling noise is caused by the hard collision of the gears in the transmission. Multiple collisions will inevitably lead to gear wear and affect the service life of the eight-speed dual-clutch transmission.
  • the present application provides a reverse gear control method of an eight-speed dual-clutch transmission.
  • the present application discloses a reverse gear control method of an eight-speed dual-clutch transmission.
  • the current vehicle speed of the vehicle is not zero.
  • the reverse gear control method of the eight-speed dual-clutch transmission includes:
  • Fig. 1 is the flow chart of the reverse gear control method of the eight-speed dual-clutch transmission provided by the embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of an eight-speed dual-clutch transmission provided by an embodiment of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection can be a fixed connection or a detachable connection. Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • the present embodiment provides a reverse gear control method of an eight-speed dual-clutch transmission, which does not produce rattling noise during reverse gear operation, and avoids reducing the service life of the transmission.
  • the reverse gear control method of the eight-speed dual-clutch transmission includes:
  • step S2 Judging whether the current vehicle speed is greater than the set vehicle speed; when the current vehicle speed is greater than the set vehicle speed, the pre-engage reverse gear operation is invalid and an alarm is issued; in response to the current vehicle speed being less than or equal to the set vehicle speed, step S3 is executed;
  • the reverse gear control method of the eight-speed dual-clutch transmission can control the reverse gear operation during driving. If the vehicle speed is high during driving, directly engaging the reverse gear at this time will inevitably produce rattling noise. When it is judged that the current vehicle speed is greater than the set speed, the pre-engage reverse gear operation is invalid to prevent the car from directly engaging the reverse gear at a high speed. Rattling noise from operation. In one example, when the current vehicle speed is not greater than the set vehicle speed, the rotation speed of the reverse driven gear 92 and the reverse driving gear 91 are all reduced to zero by controlling the rotation speed of the reverse driven gear 92 and the reverse driving gear 91. There is no speed difference between them. At this time, the reverse gear operation is performed, and there will be no rattling noise, and the hard collision of the internal gear of the reducer will be avoided.
  • step S2 when the pre-engagement reverse gear operation is invalid, an alarm message is sent to prompt that the pre-engagement reverse gear operation is invalid.
  • the alarm information is at least one of a sound signal or a light signal sent by the car dashboard.
  • step S2 when the pre-engagement reverse gear operation is invalid, the vehicle is controlled to decelerate to a speed not greater than the set speed, and then step S3 is executed.
  • the eight-speed dual-clutch transmission includes a first input shaft 1 , a second input shaft 2 , a first output shaft 3 , a second output shaft 4 and a reverse idler shaft 5 .
  • the fixed sleeve on the first input shaft 1 is provided with fifth and seventh gear driving gears 51 , first gear driving gear 11 and third gear driving gear 31 .
  • the second input shaft 2 and the first input shaft 1 are in a coaxial nesting structure, and the second input shaft 2 is fixedly set with a second gear driving gear 21, a fourth gear driving gear 41, a reverse gear driving gear 91 and six or eight gear driving gears. gear61.
  • the rotatable cover on the first output shaft 3 is provided with the second gear driven gear 22, the sixth gear driven gear 62, the fifth gear driven gear 52, and the first gear driven gear 12.
  • Gear driven gear 92 and first output gear 301 are provided with the second gear driven gear 22, the sixth gear driven gear 62, the fifth gear driven gear 52, and the first gear driven gear 12.
  • a first synchronizer 101 and a second synchronizer 102 are also arranged on the first output shaft 3 , and the first synchronizer 101 controls the second gear driven gear 22 or the sixth gear driven gear 62 to be synchronously connected to the first output shaft 3 .
  • the second synchronizer 102 controls the fifth gear driven gear 52 or the first gear driven gear 12 to be synchronously connected to the first output shaft 3 .
  • the reverse driven gear 92 is connected to the first synchronizer 101 .
  • the second output shaft 4 is arranged in parallel with the first output shaft 3 at intervals, and the second output shaft 4 is rotatably sleeved with a fourth gear driven gear 42, an eighth gear driven gear 82, a seventh gear driven gear 72, and a third gear driven gear.
  • the driving gear 32 and the second output gear 401 are arranged in parallel with the first output shaft 3 at intervals, and the second output shaft 4 is rotatably sleeved with a fourth gear driven gear 42, an eighth gear driven gear 82, a seventh gear driven gear 72, and a third gear driven gear.
  • a third synchronizer 103 and a fourth synchronizer 104 are also arranged on the second output shaft 4 .
  • the third synchronizer 103 controls the fourth-speed driven gear 42 or the eighth-speed driven gear 82 to be synchronously connected with the second output shaft 4, and the fourth synchronizer 104 controls the seventh-speed driven gear 72 or the third-speed driven gear 32 and the second output shaft 4.
  • Output shaft 4 is connected synchronously.
  • the reverse idler shaft 5 is arranged in parallel with the first output shaft 3 at intervals, and the reverse idler shaft 5 is fixedly provided with a reverse idler 93, and the reverse idler shaft 5 can reciprocate along its own axis to control the reverse idler 93 It is combined or separated with the reverse driven gear 92 and the reverse drive gear 91 at the same time; that is, the reverse idle gear shaft 5 can move along the first direction parallel to its own axis to control the reverse idle gear 93 and the reverse driven gear 92 and The reverse drive gear 91 is combined simultaneously, or the reverse idle gear shaft 5 can move along a second direction parallel to its own axis, and the reverse drive idler 93 is controlled to separate from the reverse driven gear 92 and the reverse drive gear 91 simultaneously, and the second direction opposite to the first direction.
  • the reciprocating movement of the idler gear shaft 5 along its own axis is realized through hydraulic control.
  • both ends of the idler reverse gear shaft 5 are provided with hydraulic piston chambers, and the idler reverse gear shaft 5 can reciprocate along its own axis direction by adjusting the pressure change of the two hydraulic piston chambers.
  • Step S3 includes: performing a light braking operation, controlling the pressure of the forward gear clutch to decrease to the half-mesh point or to zero, and controlling the vehicle speed to evenly decrease to zero. After the vehicle speed decreases to zero, the rotational speed of the reverse gear driven gear 92 down to zero.
  • step S3 ESC (Electronic Stability Control, vehicle body stability system) or EPB (Electrical Park Brake, electronic handbrake) performs a light braking operation.
  • ESC Electrical Stability Control, vehicle body stability system
  • EPB Electrical Park Brake, electronic handbrake
  • step S3 the reverse driven gear 92 is synchronously connected to the first output shaft 3 through the first synchronizer 101, and the first output shaft 3 is connected to the wheels of the automobile with a fixed speed ratio. , the rotational speed of the reverse driven gear 92 drops to zero.
  • step S4 is executed.
  • step S4 includes:
  • step S5 includes: when it is detected that the rotational speed of the first input shaft 1 is zero, control the synchronizer sleeve of the fourth synchronizer 104 to return to the neutral position, and at the same time control the reverse gear idler shaft 5 to move along its own axis to gear position.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Transmissions (AREA)
  • Control Of Transmission Device (AREA)

Abstract

本申请公开了一种八挡双离合变速器的倒挡控制方法，汽车的当前车速不为零，所述八挡双离合变速器的倒挡控制方法包括：执行预挂倒挡操作；判断当前车速是否大于设定车速；在当前车速大于设定车速时，预挂倒挡操作无效；响应于当前车速小于或等于设定车速，控制倒挡从动齿轮的转速降为零；控制倒挡主动齿轮的转速降为零；执行挂倒挡操作。

Description

八挡双离合变速器的倒挡控制方法
本申请要求在2021年07月28日提交中国专利局、申请号为202110857082.1的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及汽车技术领域，例如涉及一种八挡双离合变速器的倒挡控制方法。
背景技术
八挡双离合变速器是变速器之一。驾驶员通过操作八挡双离合变速器实现汽车的换挡。在汽车行驶过程中驾驶员会有倒挡需求。驾驶员在执行倒挡操作时，可能会在倒挡挂挡时产生打齿噪声。
打齿噪声会影响驾驶员和乘客的驾乘感受；且打齿噪声是由于变速器内的齿轮发生硬碰撞而产生的，多次碰撞必然会导致齿轮磨损，影响八挡双离合变速器的使用寿命。
因此，亟需一种八挡双离合变速器的倒挡控制方法来改善上述情况。
发明内容
本申请提供一种八挡双离合变速器的倒挡控制方法。
本申请公开一种八挡双离合变速器的倒挡控制方法，汽车的当前车速不为零，所述八挡双离合变速器的倒挡控制方法包括：
执行预挂倒挡操作；
判断当前车速是否大于设定车速；在当前车速大于设定车速时，预挂倒挡操作无效；响应于当前车速小于或等于设定车速，控制倒挡从动齿轮的转速降为零；
控制倒挡主动齿轮的转速降为零；
执行挂倒挡操作。
附图说明
图1是本申请实施例提供的八挡双离合变速器的倒挡控制方法的流程图；
图2是本申请实施例提供的八挡双离合变速器的结构示意图。
图中：
1、第一输入轴；2、第二输入轴；3、第一输出轴；4、第二输出轴；5、倒挡惰轮轴；
11、一挡主动齿轮；12、一挡从动齿轮；
21、二挡主动齿轮；22、二挡从动齿轮；
31、三挡主动齿轮；32、三挡从动齿轮；
41、四挡主动齿轮；42、四挡从动齿轮；
51、五七挡主动齿轮；52、五挡从动齿轮；
61、六八挡主动齿轮；62、六挡从动齿轮；
72、七挡从动齿轮；
82、八挡从动齿轮；
91、倒挡主动齿轮；92、倒挡从动齿轮；93、倒挡惰轮；
301、第一输出齿轮；401、第二输出齿轮；
101、第一同步器；102、第二同步器；103、第三同步器；104、第四同步器。
具体实施方式
为使本申请解决的技术问题、采用的技术方案和达到的技术效果更加清楚，下面结合附图并通过具体实施方式来进一步说明本申请的技术方案。可以理解的是，此处所描述的具体实施例仅仅用于解释本申请，而非对本申请的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本申请相关的部分而非全部。
在本申请的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、仅用于描述目的，而不能理解为指示或暗示相对重要性。其中，术语“第一位置”和“第二位置”为两个不同的位置。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人 员而言，可以具体情况理解上述术语在本申请中的具体含义。
参见图1和图2，本实施例提供一种八挡双离合变速器的倒挡控制方法，在进行挂倒挡操作时不会产生打齿噪声，避免降低变速器的使用寿命。
示例性地，在进行挂倒挡操作前，汽车的当前车速不为零，八挡双离合变速器的倒挡控制方法包括：
S1、执行预挂倒挡操作；
S2、判断当前车速是否大于设定车速；在当前车速大于设定车速时，预挂倒挡操作无效并发出报警；响应于当前车速小于或等于设定车速，执行步骤S3；
S3、控制倒挡从动齿轮92的转速降为零；
S4、控制倒挡主动齿轮91的转速降为零；
S5、执行挂倒挡操作。
本实施例提供的八挡双离合变速器的倒挡控制方法可以对行车过程中的倒挡操作进行控制。若行车过程中车速较高，此时直接挂倒挡必然会产生打齿噪声，当判断当前车速大于设定车速时，预挂倒挡操作无效避免汽车在较高速度状态下直接进行挂倒挡操作而产生的打齿噪声。在一示例中，当前车速不大于设定车速时，通过控制倒挡从动齿轮92的转速和倒挡主动齿轮91的转速均降为零，使得倒挡从动齿轮92和倒挡主动齿轮91之间没有转速差，此时执行挂倒挡操作，不会产生打齿噪声，避免减速器内齿轮发生硬碰撞。
在一实施例中，在步骤S2中，当预挂倒挡操作无效时，发出报警信息，提示预挂倒挡操作无效。例如，步骤S2中，报警信息为汽车仪表盘发出的声音信号或光信号中的至少一个。
例如，在步骤S2中，当预挂倒挡操作无效时，控制汽车减速至不大于设定车速，随后执行步骤S3。
在一实施例中，八挡双离合变速器包括第一输入轴1、第二输入轴2、第一输出轴3、第二输出轴4和倒挡惰轮轴5。
第一输入轴1上固定套设有五七挡主动齿轮51、一挡主动齿轮11和三挡主动齿轮31。
第二输入轴2与第一输入轴1为同轴嵌套结构，第二输入轴2上固定套设有二挡主动齿轮21、四挡主动齿轮41、倒挡主动齿轮91和六八挡主动齿轮61。
第一输出轴3上可转动套设有二挡从动齿轮22、六挡从动齿轮62、五挡从动齿轮52、一挡从动齿轮12，第一输出轴3上固定套设有倒挡从动齿轮92和第一输出齿轮301。
第一输出轴3上还设置有第一同步器101和第二同步器102，第一同步器101控制二挡从动齿轮22或者六挡从动齿轮62与第一输出轴3同步连接。第二同步器102控制五挡从动齿轮52或者一挡从动齿轮12与第一输出轴3同步连接。倒挡从动齿轮92与第一同步器101连接。
第二输出轴4与第一输出轴3平行间隔设置，第二输出轴4上可转动套设有四挡从动齿轮42、八挡从动齿轮82、七挡从动齿轮72、三挡从动齿轮32和第二输出齿轮401。
第二输出轴4上还设置有第三同步器103和第四同步器104。第三同步器103控制四挡从动齿轮42或者八挡从动齿轮82与第二输出轴4同步连接，第四同步器104控制七挡从动齿轮72或者三挡从动齿轮32与第二输出轴4同步连接。
倒挡惰轮轴5与第一输出轴3平行间隔设置，倒挡惰轮轴5上固定套设有倒挡惰轮93，倒挡惰轮轴5能够沿自身轴线方向往复移动以控制倒挡惰轮93与倒挡从动齿轮92和倒挡主动齿轮91同时结合或者同时分离；即倒挡惰轮轴5能够沿平行自身轴线的第一方向移动，控制倒挡惰轮93与倒挡从动齿轮92和倒挡主动齿轮91同时结合，或者倒挡惰轮轴5能够沿平行自身轴线的第二方向移动，控制倒挡惰轮93与倒挡从动齿轮92和倒挡主动齿轮91同时分离，第二方向与第一方向相反。
在一实施例中，通过液压控制实现倒挡惰轮轴5沿自身轴线方向往复移动。例如，倒挡惰轮轴5的两端均设置有液压活塞腔，通过调节两个液压活塞腔的压力变化实现倒挡惰轮轴5沿自身轴线方向往复移动。
步骤S3包括：进行轻制动操作，控制前进挡离合器控制压力减小到半啮合点或者降为零，控制汽车车速均匀降为零，汽车车速降为零后，倒挡从动齿轮92的转速降为零。
在一实施例中，步骤S3中，ESC(Electronic Stability Control，车身稳定系统)或EPB(Electrical Park Brake，电子手刹)进行轻制动操作。
在一实施例中，步骤S3中，倒挡从动齿轮92通过第一同步器101与第一输出轴3同步连接，第一输出轴3与汽车的车轮固定速比连接，汽车车速为零后，倒挡从动齿轮92的转速降为零。
发动机处于怠速状态，离合器主动端转速与发动机怠速转速相同，由于离合器的主动端与从动端存在拖曳作用，与倒挡主动齿轮91所在第一输入轴1连接的离合器从动端会被主动端拉起一定转速，导致倒挡主动齿轮91与倒挡从动 齿轮92之间存在转速差，如果此时倒挡惰轮93移动挂挡并与倒挡从动齿轮92和倒挡主动齿轮91同时啮合，则会发生打齿情况。此时，执行步骤S4。
在一实施例中，步骤S4包括：
控制三挡从动齿轮32通过第四同步器104与第二输出轴4同步连接，则此时三挡从动齿轮32的转速降为零，与三挡从动齿轮32常啮合的三挡主动齿轮31的转速也降为零，从而使得第一输出轴3的转速也降为零。
在一实施例中，步骤S5包括：检测到第一输入轴1的转速为零时，控制第四同步器104的同步器齿套退回空挡位置，同时控制倒挡惰轮轴5沿自身轴线移动至挂挡位置。
本申请不受上述实施方式限制，本申请实施例还有各种变化和改变，这些变化和改变都落入要求保护的本申请范围内。本申请要求保护范围由所附的权利要求书及其等效物界定。

Claims (11)

  1. 一种八挡双离合变速器的倒挡控制方法，汽车的当前车速不为零，所述八挡双离合变速器的倒挡控制方法包括：
    执行预挂倒挡操作；
    判断当前车速是否大于设定车速；在当前车速大于设定车速时，预挂倒挡操作无效；响应于当前车速小于或等于设定车速，控制倒挡从动齿轮(92)的转速降为零；
    控制倒挡主动齿轮(91)的转速降为零；
    执行挂倒挡操作。
  2. 根据权利要求1所述的八挡双离合变速器的倒挡控制方法，其中，所述八挡双离合变速器包括：
    第一输入轴(1)，所述第一输入轴(1)上固定套设有五七挡主动齿轮(51)、一挡主动齿轮(11)和三挡主动齿轮(31)；
    第二输入轴(2)，与所述第一输入轴(1)为同轴嵌套结构，所述第二输入轴(2)上固定套设有二挡主动齿轮(21)、四挡主动齿轮(41)、所述倒挡主动齿轮(91)和六八挡主动齿轮(61)；
    第一输出轴(3)，所述第一输出轴(3)上可转动套设有二挡从动齿轮(22)、六挡从动齿轮(62)、五挡从动齿轮(52)和一挡从动齿轮(12)，所述第一输出轴(3)上固定套设有所述倒挡从动齿轮(92)和第一输出齿轮(301)；
    第二输出轴(4)，与所述第一输出轴(3)平行间隔设置，所述第二输出轴(4)上可转动套设有四挡从动齿轮(42)、八挡从动齿轮(82)、七挡从动齿轮(72)、三挡从动齿轮(32)和第二输出齿轮(401)；
    倒挡惰轮轴(5)，与所述第一输出轴(3)平行间隔设置，所述倒挡惰轮轴(5)上固定套设有倒挡惰轮(93)，所述倒挡惰轮轴(5)能够沿自身轴线方向往复移动以控制所述倒挡惰轮(93)与所述倒挡从动齿轮(92)和所述倒挡主动齿轮(91)同时结合或者同时分离；
    所述控制倒挡从动齿轮(92)的转速降为零，包括：进行轻制动操作，控制前进挡离合器控制压力减小到半啮合点或者降为零，控制汽车车速均匀降为零，以使汽车车速降为零后，所述倒挡从动齿轮(92)的转速降为零。
  3. 根据权利要求2所述的八挡双离合变速器的倒挡控制方法，其中，所述倒挡从动齿轮(92)通过第一同步器(101)与所述第一输出轴(3)连接，所述第一输出轴(3)与汽车的车轮固定速比连接，汽车车速为零后，所述倒挡从动齿轮(92)的转速降为零。
  4. 根据权利要求2所述的八挡双离合变速器的倒挡控制方法，其中，所述控制倒挡主动齿轮(91)的转速降为零，包括：
    控制所述三挡从动齿轮(32)通过第四同步器(104)与所述第二输出轴(4)连接，以使所述三挡从动齿轮(32)的转速降为零，与所述三挡从动齿轮(32)啮合的三挡主动齿轮(31)的转速降为零，从而使得所述第一输出轴(3)的转速降为零。
  5. 根据权利要求4所述的八挡双离合变速器的倒挡控制方法，其中，所述执行挂倒挡操作，包括：响应于检测到所述第一输入轴(1)的转速为零，控制所述第四同步器(104)的同步器齿套退回空挡位置，同时控制所述倒挡惰轮轴(5)沿自身轴线移动至挂挡位置。
  6. 根据权利要求2所述的八挡双离合变速器的倒挡控制方法，其中，通过液压控制实现所述倒挡惰轮轴(5)沿自身轴线方向往复移动。
  7. 根据权利要求6所述的八挡双离合变速器的倒挡控制方法，其中，所述倒挡惰轮轴(5)的两端分别设置有液压活塞腔。
  8. 根据权利要求1-7任一项所述的八挡双离合变速器的倒挡控制方法，还包括：响应于预挂倒挡操作无效，发出报警信息，提示预挂倒挡操作无效。
  9. 根据权利要求8所述的八挡双离合变速器的倒挡控制方法，其中，所述报警信息为汽车仪表盘发出的声音信号或光信号中的至少一个。
  10. 根据权利要求1-7任一项所述的八挡双离合变速器的倒挡控制方法，还包括：响应于预挂倒挡操作无效，控制汽车减速至小于或等于所述设定车速，执行所述控制倒挡从动齿轮(92)的转速降为零。
  11. 一种八挡双离合变速器的倒挡控制方法，所述八挡双离合变速器的倒挡控制方法包括：
    执行预挂倒挡操作；
    判断当前车速是否大于设定车速；
    响应于当前车速小于或等于设定车速，控制倒挡从动齿轮(92)的转速降为零；
    控制倒挡主动齿轮(91)的转速降为零；
    执行挂倒挡操作。
PCT/CN2022/108289 2021-07-28 2022-07-27 八挡双离合变速器的倒挡控制方法 WO2023005982A1 (zh)

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