CN111491834B - 用于车辆的液压制动系统以及相应的运行方法 - Google Patents
用于车辆的液压制动系统以及相应的运行方法 Download PDFInfo
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- B60—VEHICLES IN GENERAL
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- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
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- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/142—Systems with master cylinder
- B60T13/147—In combination with distributor valve
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
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- B60T13/142—Systems with master cylinder
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
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- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
- B60T13/148—Arrangements for pressure supply
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/10—ABS control systems
- B60T2270/14—ABS control systems hydraulic model
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- B60—VEHICLES IN GENERAL
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- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/20—ASR control systems
- B60T2270/203—ASR control systems hydraulic system components
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- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/30—ESP control system
- B60T2270/306—ESP control system hydraulic system components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/84—Driver circuits for actuating motor, valve and the like
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- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
- B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
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Abstract
本发明涉及一种用于车辆的液压制动系统(1),所述液压制动系统具有主制动缸(5)、液压单元(9)和多个车轮制动器(RR、FL、FR、RL),其中,所述液压单元(9)包括至少一个制动回路(BC1、BC2),所述制动回路用于所述车轮制动器(RR、FL、FR、RL)中的制动压力调制,并且本发明涉及一种用于这种制动系统(1)的相应的运行方法。对此,至少一个车轮制动器(RR、FL、FR、RL)配备有双稳态电磁阀(BM),所述双稳态电磁阀直接在所配属的车轮制动器(RR、FL、FR、RL)上游接入到相应的流体通道中,并且在无电流打开位置中实现在所配属的车轮制动器(RR、FL、FR、RL)中的制动压力调制,并且在无电流闭合位置中将当前的制动压力锁定在所配属的所述车轮制动器(RR、FL、FR、RL)中,其中,包括可接通的蓄能器(12)的体积补偿装置(10、10A)在所述双稳态电磁阀(BM)和所配属的车轮制动器(RR、FL、FR、RL)之间通到相应的流体通道中。
Description
技术领域
本发明涉及一种根据独立权利要求1所述类型的、用于车辆的液压制动系统。一种用于这种制动系统的相应的运行方法也是本发明的主题。
背景技术
由现有技术公开了用于车辆的液压制动系统,其具有主制动缸、液压单元以及多个车轮制动器,所述液压制动系统包括不同的安全系统,比如防抱死系统(ABS)、电子稳定程序(ESP)等等,并且可以实施不同的安全功能,比如防抱死功能、驱动防滑调节(ASR)等等。通过液压单元可以在防抱死系统(ABS)中或者在驱动防滑调节系统(ASR系统)中或者在电子稳定程序系统(ESP系统)中执行控制和/或调节过程,以用于在相应的车轮制动器中形成压力或者降低压力。为了执行控制和/或调节过程,液压单元包括电磁阀,所述电磁阀由于相反作用的力,比如“磁力”、“弹力”和“液压力”,大多保持在明确的位置中。相应地,存在“无电流打开”和“无电流闭合”的阀类型。此外,已知双稳态电磁阀,其在每次通电时改变其状态并且即使没有保持电流也保持在该状态中直至下一次通电。
发明内容
具有独立权利要求1的特征的用于车辆的液压制动系统和具有独立权利要求10的特征的用于液压制动系统的相应的运行方法具有以下优点,即使用在通电时在稳定的状态“打开”和“闭合”之间变换的双稳态电磁阀,以便将当前的制动压力锁定在所配属的车轮制动器中。因为相应的制动液的体积强烈地取决于温度,所以由于温度变化可以产生被锁定在相应的车轮制动器中的制动压力的大的压力变化。在本发明的实施方式中,能够以有利的方式补偿被锁定在车轮制动器中的制动压力的压力变化,所述压力变化例如可能由于这样的温度变化而产生。
本发明的实施方式提供了一种用于车辆的液压制动系统,液压制动系统具有主制动缸、液压单元和多个车轮制动器,其中,所述液压单元包括至少一个用于在所述车轮制动器中的制动压力调制的制动回路。在此,为至少一个车轮制动器配设双稳态电磁阀,该电磁阀直接在所配属的车轮制动器上游接入相应的流体通道中,并且在无电流打开位置中实现在所配属的车轮制动器中的制动压力调制,并且在无电流闭合位置中将当前的制动压力锁定在所配属的车轮制动器中。此外,包括可接通的蓄能器的体积补偿装置在所述双稳态电磁阀和所配属的车轮制动器之间通到相应的流体通道中。
此外,提出一种用于这种液压制动系统的运行方法,该液压制动系统在压力保持功能中将配属于至少一个车轮制动器的双稳态电磁阀切换到无电流闭合位置中并且将当前的制动压力锁定在所配属的车轮制动器中。此外,体积补偿装置的可接通的蓄能器在行驶运行中与所配属的车轮制动器分离,并且在压力保持功能期间与所配属的车轮制动器连接,以便在所配属的车轮制动器中恒定地保持被锁定的制动压力。
通过双稳态电磁阀能够利用较小的附加耗费在大多存在的、具有ESP功能的液压单元上实现附加功能,该附加功能能够将当前的制动压力电动液压地锁定在相应的车轮制动器中并且在较小的能量需求的情况下在更长的时间间隔内得到保持。这意味着,现有的压力供应部、从液压单元直至车轮制动器的管路以及传感器信号和通信信号不仅可以用于ESP功能和/或ABS功能和/或ASR功能,而且也可以用于车轮制动器中的电动液压的压力保持功能。由此能够以有利的方式伴随积极的效果节省成本、结构空间、重量和布线,从而降低制动系统的复杂性。
因为所述双稳态电磁阀直接在所配属的车轮制动器上游被接入到相应的流体通道中,所以能够以有利的方式减少可能的泄漏位置,由此使得借助于体积补偿装置恒定地保持被锁定的制动压力更加简单。
通过在从属权利要求中所列举的措施和改进方案,可以有利地改进在独立权利要求1中所说明的、用于车辆的液压制动系统以及在独立权利要求10中所说明的、用于液压制动系统的运行方法。
特别有利的是,所述所述体积补偿装置能够包括至少一个蓄能器阀,所述蓄能器阀在打开位置中将所述蓄能器与相应的车轮制动器连接,并且在闭合位置中将所述蓄能器与相应的车轮制动器分离。
在所述液压制动系统的有利的设计方案中,所述至少一个蓄能器阀能够使得所述蓄能器在行驶运行中与相应的车轮制动器分离。这意味着,当车辆处于行驶运行中时,所述双稳态电磁阀打开并且所述至少一个蓄能器阀闭合。由此,以有利的方式保持了用于所属的车轮制动器的制动压力调制的典型功能不受影响。此外,能够通过在行驶运行中将蓄能器与相应的车轮制动器分离以有利的方式避免踏板行程延长。此外,所述至少一个蓄能器阀能够使得所述蓄能器与相应的车轮制动器连接,以便在所配属的车轮制动器中恒定地保持被锁定的制动压力。由此,所述蓄能器能够在温度上升时吸收体积或者在温度下降时释放体积,以便能够恒定地保持被锁定的制动压力。
在所述液压制动系统的另一种有利的设计方案中,所述至少一个蓄能器阀能够是双稳态电磁阀。由此能够以有利的方式在较小的能量需求下在更长的时间间隔中补偿被锁定的制动压力的由温度引起的压力变化。替代地,所述至少一个蓄能器阀能够是无电流打开的电磁阀。对此,在行驶运行中在识别出踏板操纵时所述至少一个蓄能器阀被通电并且由此闭合,从而总是主动地分隔所述蓄能器的蓄能器体积。
在所述液压制动系统的另一种有利的设计方案中,能够设有用于至少两个车轮制动器的共同的体积补偿装置。由此,当在多个车轮制动器中在更长的时间间隔中恒定地保持制动压力时,能够以有利的方式较少地保持体积补偿装置的数量。所述共同的体积补偿装置的蓄能器能够经由第一蓄能器阀和接下来的支路与至少两个车轮制动器的流体通道连接。替代地,所述共同的体积补偿装置针对每个所配属的车轮制动器都包括一蓄能器阀,经由所述蓄能器阀能够将所述共同的体积补偿装置的蓄能器与所配属的车轮制动器的流体通道连接。
在运行方法的有利的设计方案中,能够估算或者测量环境温度和/或制动器温度。此外,能够取决于所述环境温度和/或制动器温度估算被锁定在所配属的车轮制动器中的制动压力的温度变化。由此以有利的方式,当所估算的温度变化预示着制动压力的降低时,能够将更高的制动压力锁定在所配属的车轮制动器中。此外,当所估算的温度变化预示着制动压力的升高时,将最小制动压力锁定在所配属的车轮制动器中。
在附图中示出了本发明的实施例并且在下文的说明中进行具体阐释。在附图中,相同的附图标记表示实施相同的或类似的功能的组件或元件。
附图说明
图1示出了根据本发明的用于车辆的液压制动系统的第一实施例的示意性的液压线路图;
图2示出了根据本发明的用于车辆的液压制动系统的第二实施例的示意性的液压线路图;
图3示出了根据本发明的用于车辆的液压制动系统的第三实施例的示意性的液压线路图。
具体实施方式
如从图1至图3中可以看出的那样,所示出的根据本发明的用于车辆的液压制动系统1、1A、1B的实施例分别包括一主制动缸5、一液压单元9、9A、9B和多个车轮制动器RR、FL、FR、RL。为了对在车轮制动器RR、FL、FR、RL中的制动压力进行调制,所述液压单元9、9A、9B包括至少一个制动回路BC1、BC2。在此,至少一个车轮制动器RR、FL、FR、RL配备有双稳态电磁阀BM,该双稳态电磁阀直接在所配属的车轮制动器RR、FL、FR、RL上游接入到相应的流体通道中,并且在无电流打开位置中实现对在所配属的车轮制动器RR、FL、FR、RL中的制动压力进行调制,并且在无电流闭合位置中将当前的制动压力锁定在所配属的车轮制动器RR、FL、FR、RL中,其中,包括可接通的蓄能器12的体积补偿装置10、10A在所述双稳态电磁阀BM和所配属的车轮制动器RR、FL、FR、RL之间通到相应的流体通道中。
如由图1至图3进一步可见,所示出的根据本发明的、用于车辆的液压制动系统1、1A、1B的实施例分别包括两个制动回路BC1、BC2,四个车轮制动器RR、FL、FR、RL中的两个车轮制动器分别配属于所述两个制动回路。于是,例如在右侧布置在车辆前桥上的第一车轮制动器FR和例如在左侧布置在车辆后桥上的第二车轮制动器RL配属于第一制动回路BCl。例如在右侧布置在车辆后桥上的第三车轮制动器RR和例如在左侧布置在车辆前桥上的第四车轮制动器FL配属于第二制动回路BC2。输入阀EV11、EV21、EV12、EV22和排出阀AV11、AV21、AV12、AV22配属于每个车轮制动器RR、FL、FR、RL,其中,通过所述输入阀EV11、EV21、EV12、EV22可以分别在相应的车轮制动器RR、FL、FR、RL中建立压力,并且其中,通过所述排出阀AV11、AV21、AV12、AV22可以分别在相应的车轮制动器RR、FL、FR、RL中降低压力。为了在各个车轮制动器RR、FL、FR、RL中形成压力,打开相应的输入阀EV11、EV12、EV21、EV22并且闭合相应的排出阀AV11、AV12、AV21、AV22。为了在各个车轮制动器RR、FL、FR、RL中降低压力,闭合相应的输入阀EV11、EV21、EV12、EV22,并且打开相应的排出阀AV11、AV21、AV12、AV22。
如图1至图3进一步可见,第一输入阀EV11和第一排出阀AV11配属于第一车轮制动器FR,第二输入阀EV21和第二排出阀AV21配属于第二车轮制动器RL,第三输入阀EV12和第三排出阀AV12配属于第三车轮制动器RR,并且第四输入阀EV22和第四排出阀AV22配属于第四车轮制动器FL。经由输入阀EVll、EV21、EV12、EV22和排出阀AV11、AV21、AV12、AV22可以执行用于实施ABS功能的控制过程和/或调节过程。
此外,第一制动回路BC1包括第一抽吸阀HSV1、第一系统压力调节阀USV1、带有第一止回阀RSV1的第一平衡容器A1和第一流体泵PE1。第二制动回路BC2包括第二抽吸阀HSV2、第二系统压力调节阀USV2、带有第二止回阀RSV2的第二平衡容器A2和第二流体泵PE2,其中,所述第一和第二流体泵PE1、PE2由共同的电动马达M驱动。此外,液压单元9、9A、9B为了确定当前的系统压力或制动压力而包括传感器单元9.1。液压单元9、9A、9B为了制动压力调制并且为了在第一制动回路BC1中实施ASR功能和/或ESP功能而使用第一系统压力调节阀USV1、第一抽吸阀HSV1和第一回供泵PEl,并且在第二制动回路BC2中使用第二系统压力调节阀USV2、第二抽吸阀HSV2和第二回供泵PE2。如从图1至图3中还可看到的那样,每个制动回路BC1、BC2与主制动缸5连接,主制动缸可以通过制动踏板3操纵。此外,流体容器7与主制动缸5连接。在不存在驾驶员请求的情况下,所述抽吸阀HSVl、HSV2能够实现对制动系统的干预。为此,通过所述抽吸阀HSV1、HSV2打开用于相应的流体泵PE1、PE2的、通向主制动缸5的相应抽吸路径,从而该流体泵可以代替驾驶员提供用于调节所需的压力。系统压力调节阀USV1、USV2布置在主制动缸5和至少一个所配属的车轮制动器RR、FL、FR、RL之间并且调节所属的制动回路BC1、BC2中的系统压力或制动压力。如从图1至图3中还可以看出的那样,第一系统压力调节阀USV1调节第一制动回路BC1中的系统压力或制动压力,并且第二系统压力调节阀USV2调节第二制动回路BC2中的系统压力或制动压力。
如从图1至图3中还可以看出的那样,在所示出的实施例中,四个双稳态电磁阀BM分别直接在所配属的车轮制动器RR、FL、FR、RL之前接入到各个流体通道中。
如从图1至图3中还可以看出的那样,所述体积补偿装置10、10A在所示出的实施例中包括至少一个蓄能器阀14,所述蓄能器阀在打开位置中将所述蓄能器12与相应的车轮制动器RR、FL、FR、RL连接,并且在闭合位置中将所述蓄能器12与相应的车轮制动器RR、FL、FR、RL分离。所述至少一个蓄能器阀14使得所述蓄能器12在行驶运行中与相应的车轮制动器RR、FL、FR、RL分离。除了行驶运行之外,所述至少一个蓄能器阀14使得所述蓄能器12与相应的车轮制动器RR、FL、FR、RL连接,以便在所配属的车轮制动器RR、FL、FR、RL中恒定地保持被锁定的制动压力。在所示出的实施例中,所述至少一个蓄能器阀14是双稳态电磁阀。在一种替代的、未示出的实施例中,所述至少一个蓄能器阀14是是无电流打开的电磁阀
如从图1和图2中进一步可以看出的那样,在液压制动系统1、1A的所示出的实施例中,设有用于制动回路BC1、BC2的各两个车轮制动器RR、FL、FR、RL的共同的体积补偿装置10、10A。
如从图1中进一步可以看出的那样,在所示出的第一实施例中,所述共同的体积补偿装置10的两个蓄能器12分别经由一第一切换阀14和一随后构造为T形块的支路与两个所配属的车轮制动器RR、FL、FR、RL的流体通道连接。
如从图2中进一步可以看出的那样,在所示出的第二实施例中,所述共同的体积补偿装置10A的两个蓄能器12分别经由两个切换阀14与两个所配属的车轮制动器RR、FL、FR、RL的流体通道连接。这意味着,所述共同的体积补偿装置10A针对每个所配属的车轮制动器RR、FL、FR、RL都包括一蓄能器阀14,经由所述蓄能器阀能将所述共同的体积补偿装置10A的蓄能器12与所配属的车轮制动器RR、FL、FR、RL的流体通道连接。
如从图3中进一步可以看出的那样,每个车轮制动器RR、FL、FR、RL配备有一带有蓄能器12和蓄能器阀14的体积补偿装置10。
根据按照本发明的运行方法的实施方式,在压力保持功能中,配属于至少一个车轮制动器RR、FL、FR、RL的双稳态电磁阀10被切换到无电流闭合位置中并且将当前的制动压力锁定在所配属的车轮制动器RR、FL、FR、RL中,其中,所述体积补偿装置10、10A的可接通的蓄能器12在行驶运行中与所配属的车轮制动器RR、FL、FR、RL分离,并且除了行驶运行之外在压力保持功能期间与所配属的车轮制动器RR、FL、FR、RL连接,以便在所配属的车轮制动器RR、FL、FR、RL中恒定地保持被锁定的制动压力。
为了改善所述运行方法,估算或者测量环境温度和/或制动器温度。取决于所述环境温度和/或制动器温度来估算被锁定在所配属的车轮制动器RR、FL、FR、RL中的制动压力的温度变化。基于所述估算,当所估算的温度变化预示着制动压力的降低时,能够将更高的制动压力锁定在所配属的车轮制动器RR、FL、FR、RL中。替代地,当所估算的温度变化预示着制动压力的升高时,将最小制动压力锁定在所配属的车轮制动器RR、FL、FR、RL中。
本发明的实施方式提供了一种用于车辆的液压制动系统,该液压制动系统利用在液压单元上的很小的附加耗费包括以下附加功能:在车轮制动器中电动液压地保持压力。在此,本发明的实施方式能够以有利的方式实现对可能存在的内部泄漏和体积膨胀的补偿,所述内部泄漏和体积膨胀例如由于温度变化而发生。通过体积补偿装置能够在更长的时间间隔中在至少一个所配属的车轮制动器RR、FL、FR、RL中恒定地保持在双稳态电磁阀BM的无电流闭合位置中被锁定的制动压力。
Claims (12)
1.一种用于车辆的液压制动系统(1、1A、1B),所述液压制动系统具有主制动缸(5)、液压单元(9、9A、9B)和多个车轮制动器(RR、FL、FR、RL),其中,所述液压单元(9、9A、9B)包括至少一个用于对在所述车轮制动器(RR、FL、FR、RL)中的制动压力进行调制的制动回路(BC1、BC2),其特征在于,至少一个车轮制动器(RR、FL、FR、RL)配备有双稳态电磁阀(BM),所述双稳态电磁阀直接在所配属的车轮制动器(RR、FL、FR、RL)上游接入到相应的流体通道中,并且在无电流打开位置中实现在所配属的车轮制动器(RR、FL、FR、RL)中的制动压力调制,并且在无电流闭合位置中将当前的制动压力锁定在所配属的所述车轮制动器(RR、FL、FR、RL)中,其中,包括可接通的蓄能器(12)的体积补偿装置(10、10A)在所述双稳态电磁阀(BM)和所配属的车轮制动器(RR、FL、FR、RL)之间通到相应的流体通道中,并且其中,设有用于至少两个车轮制动器(RR、FL、FR、RL)的共同的体积补偿装置(10、10A),所述共同的体积补偿装置(10、10A)的所述蓄能器(12)经由一第一蓄能器阀(14)和支路与至少两个车轮制动器(RR、FL、FR、RL)的流体通道连接。
2.根据权利要求1所述的液压制动系统(1、1A、1B),其特征在于,所述体积补偿装置(10、10A)包括至少一个蓄能器阀(14),所述蓄能器阀在打开位置中将所述蓄能器(12)与相应的车轮制动器(RR、FL、FR、RL)连接,并且在闭合位置中将所述蓄能器(12)与相应的车轮制动器(RR、FL、FR、RL)分离。
3.根据权利要求2所述的液压制动系统(1、1A、1B),其特征在于,所述至少一个蓄能器阀(14)使得所述蓄能器(12)在行驶运行中与相应的车轮制动器(RR、FL、FR、RL)分离。
4.根据权利要求2或3所述的液压制动系统(1、1A、1B),其特征在于,所述至少一个蓄能器阀(14)将所述蓄能器(12)与相应的车轮制动器(RR、FL、FR、RL)连接,以便在所配属的车轮制动器(RR、FL、FR、RL)中恒定地保持被锁定的制动压力。
5.根据权利要求2或3所述的液压制动系统(1、1A、1B),其特征在于,所述至少一个蓄能器阀(14)是双稳态电磁阀。
6.根据权利要求2或3所述的液压制动系统(1、1A、1B),其特征在于,所述至少一个蓄能器阀(14)是无电流打开的电磁阀。
7.根据权利要求1所述的液压制动系统(1A),其特征在于,所述共同的体积补偿装置(10、10A)针对每个所配属的车轮制动器(RR、FL、FR、RL)都包括一蓄能器阀(14),经由所述蓄能器阀能将所述共同的体积补偿装置(10、10A)的所述蓄能器(12)与所配属的车轮制动器(RR、FL、FR、RL)的流体通道连接。
8.一种用于液压制动系统(1、1A、1B)的运行方法,所述液压制动系统根据权利要求1至7中至少任一项实施,其特征在于,在压力保持功能中,配属于至少一个车轮制动器(RR、FL、FR、RL)的双稳态电磁阀被切换到无电流闭合位置中并且将当前的制动压力锁定在所配属的车轮制动器(RR、FL、FR、RL)中,其中,所述体积补偿装置(10、10A)的可接通的蓄能器(12)在行驶运行中与所配属的车轮制动器(RR、FL、FR、RL)分离,并且在压力保持功能期间与所配属的车轮制动器(RR、FL、FR、RL)连接,以便在所配属的车轮制动器(RR、FL、FR、RL)中恒定地保持被锁定的制动压力。
9.根据权利要求8所述的运行方法,其特征在于,估算或者测量环境温度和/或制动器温度。
10.根据权利要求9所述的运行方法,其特征在于,取决于所述环境温度和/或制动器温度估算被锁定在所配属的车轮制动器(RR、FL、FR、RL)中的制动压力的温度变化。
11.根据权利要求10所述的运行方法,其特征在于,当所估算的温度变化预示着制动压力的降低时,将更高的制动压力锁定在所配属的车轮制动器(RR、FL、FR、RL)中。
12.根据权利要求10或11所述的运行方法,其特征在于,当所估算的温度变化预示着制动压力的升高时,将最小制动压力锁定在所配属的车轮制动器(RR、FL、FR、RL)中。
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