CN110015286B - 在具有机电制动力放大的、能够电子滑动调节的车辆制动系统中增强制动力的方法 - Google Patents
在具有机电制动力放大的、能够电子滑动调节的车辆制动系统中增强制动力的方法 Download PDFInfo
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- B60—VEHICLES IN GENERAL
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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
- B60T13/12—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
- 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
- B60T13/145—Master cylinder integrated or hydraulically coupled with booster
- B60T13/146—Part of the system directly actuated by booster pressure
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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
- B60T13/12—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
- B60T13/16—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 pumps directly, i.e. without interposition of accumulators or reservoirs
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- B60T13/166—Part of the system directly actuated by booster pressure
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- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
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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
- B60T13/74—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 electrical assistance or drive
- B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
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- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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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
- 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
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- B60T8/321—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 deceleration
Abstract
在具有机电制动力放大的、能够电子滑动调节的车辆制动系统(110)中增强制动力的方法。所述车辆制动系统(110)装备有制动愿望检测装置(112)、制动力放大器(120)和制动压力调节装置(124)。当所述制动力放大器(120)受到干扰时,替代地由所述制动压力调节装置(124)来增强所述制动压力。根据本发明,如果在进行制动力放大时受到干扰,则检查是否能够生成并且从所述制动力放大器(120)的第一电子控制器(122)到所述制动压力调节装置(124)的第二电子控制器(130)传输触发信号(240),所述触发信号代表对所述制动愿望检测装置(112)的操纵,如果这是能够实现的话,则经由存在的通信连接(132)在所述控制器(122、130)之间传输所述触发信号(240)。
Description
技术领域
本发明涉及一种根据本发明的、用于在具有机电制动力放大的、能够电子滑动调节的车辆制动系统中增强制动力的方法。
背景技术
车辆制动系统通常装备有用于检测制动愿望的装置。这个制动愿望检测装置能够从外部利用可变的操纵力来加载,并且将所述操纵力转化为与此相关联的操纵行程。通常,制动愿望检测装置为此包括能够由驾驶员借助于制动踏板或者制动杠杆操纵的主制动缸。
本发明所基于的车辆制动系统此外还装备有机电制动力放大器,该制动力放大器由第一电子控制器根据该制动愿望检测装置的操纵路径实施操纵冲程,以便增强由驾驶员产生的制动压力。
现有的行程传感机构在这个背景下为所述第一电子控制器提供与该制动愿望检测装置的操纵行程相关联的行程信号。已知的行程传感机构为此能够例如装备有绝对行程传感器或者对此替代地装备有差别行程传感器。该制动愿望检测装置的操纵行程利用绝对行程传感器来测量,而该制动愿望检测装置相对于该电子制动力放大器的操纵冲程的操纵行程、进而这两个装置之间的行程差利用差别行程传感器来测量。
另外,本发明所基于的车辆制动系统还装备有电子制动压力调节装置。这个电子制动压力调节装置使各个车轮制动器的制动压力适配于该车辆的相应配属的车轮的滑动率。所述制动压力调节装置为此装备有第二电子控制器,该第二电子控制器除了操控能够电子加载的阀之外还操控能够电动驱动的压力产生器。根据功能范围,具有这样的制动压力调节装置的车辆制动系统也被称为ABS车辆制动系统、ASR车辆制动系统或者ESP车辆制动系统。
在制动力放大器的第一电子控制器与制动压力调节装置的第二电子控制器之间存在数据总线连接或者通信连接,经由该数据总线连接或者通信连接能够传输第一信号和第二信号,该第一信号代表制动力放大器的正常运行,该第二信号代表对制动愿望检测装置的操纵。这个第二信号优选是二进制触发信号,当驾驶员超过了能够确定的操纵阈值、例如该制动愿望检测装置的最小操纵行程时,设置该二进制触发信号。
当存在对制动力放大的功能干扰时,在已知的车辆制动系统中,替代地由该制动压力调节装置的压力产生器来增强制动力。用于所述压力产生器的操控信号在此由配属的第二电子控制器来提供。在较早的专利申请DE 10 2016 225 694中说明了用于计算这个操控信号的方法。这个方法基于所阐述的二进制触发信号。利用一信号来进行计算,该信号考虑由于操纵该制动愿望检测装置而在制动压力调节系统中产生的系统压力或者制动压力。
其缺点在于,所述二进制触发信号必须经由离散的线路连接传输到该制动压力调节装置的第二电子控制器处,因为不再可能经由在该制动力放大器的第一电子控制器与该制动压力调节装置的第二电子控制器之间的通信连接来传递这个触发信号。其原因是,在所述触发信号上叠加由状态信号,当在所述电子制动力放大器处识别出干扰时,该状态信号将该触发信号的状态从到目前为止的“信号有效”设置为“信号无效”。即便如此,当该制动愿望检测装置的行程信号仍可供使用时,仍使用所阐述的方法,因为用于产生和传输这个行程信号的部件未改变地正常运行。后者例如在下述情况下能够发生:当在所述制动力放大器处仅出现机械方面的故障、但是电子部件仍正常运行时,当由于确定出现了温度升高或者由于车载电网电压过高或者过低而关闭该电子制动力放大器时,或者当触发的事件在读取保存有例如该制动力放大器的功能状态的信息存储器时出现故障时。
发明内容
根据本发明的、根本发明的、用于在能够电子滑动调节的车辆制动系统中增强制动力的方法相对于已知的现有技术具有下述优点:在尽管存在对制动力放大的干扰、但用于生成和传输代表该制动愿望检测装置的操纵行程的行程信号所需的部件仍正常运行的所有情况下,经由在该制动力放大器的和该制动压力调节装置的电子控制器之间的通信连接来传递触发信号。根据本发明,这通过下述方式实现:确定该触发信号的状态的状态信号根据本发明在所阐述的情况下被设置为“信号有效”。因此,所述触发信号现在能够经由所述通信连接从该制动力放大器的第一控制器传输到该制动压力调节装置的第二电子控制器处,并且能够无需替代地省去用于传递这个信号的单独的线路连接。根据本发明的方法工作的车辆制动系统在其回落水平(Rückfallebene)中、即在制动力放大受到干扰时在零件花费和安装花费较低的情况下具有改善的运行特性。因此,装备有本发明所基于的车辆制动系统的机动车的运行安全性以及尤其是制动性能得到扩展和改善。即使没有附加的机械的或者电子的构件,根据本发明的方法也足以胜任,并且能够成本有利地实施,其方式是利用本来就存在的、在电子控制器之间的通信连接。
本发明的其他优点或者有利的扩展方案由下面的说明书得出。
附图说明
在下面的说明书中详细阐述本发明所基于的方法。这个说明书基于图1至3,其中,
图1示出本发明所基于的车辆制动系统的原理结构,
图2示出方法相关的信号的行程/时间曲线图,和
图3示出根据本发明的流程图。
具体实施方式
本发明以具有机电制动力放大的、能够电子滑动调节的车辆制动系统为前提。这样一种车辆制动系统的示例性结构在图1中示出。所示出的车辆制动系统110具有制动愿望检测装置112,该制动愿望检测装置示范性地能够经由制动踏板114来操纵,并且分别为两个闭合式制动回路134;136供应制动压力。
制动愿望检测装置112与机电制动力放大器120共同起作用,以产生该制动压力。这个机电制动力放大器例如具有电动驱动器121,该电动驱动器能够由第一电子控制器122来操控,该第一电子控制器配属于制动力放大器120。为了生成用于驱动器121的操控信号,电子控制器122评估行程传感机构116的行程信号118,该行程传感机构检测制动愿望检测装置112的操纵行程。
除此之外,车辆制动系统110装备有电子制动压力调节装置124,该电子制动压力调节装置将由制动力放大器120和制动愿望检测装置112共同提供的制动压力分配到车轮制动器128上,所述车轮制动器与这个制动压力调节装置124连接。在此,制动压力调节装置124使各个车轮的制动压力适配于相应配属的车轮的滑动率。为此,制动压力调节装置124具有第二电子控制器130,该第二电子控制器除其他外操控制动压力调节装置124的、电动操纵的压力产生器126。
两个控制器122和130经由通信连接132相互交换控制信号。例如当在制动力放大器120处存在运行干扰时,由此能够替代地通过制动压力调节装置124的压力产生器126来增强制动力。
然而,在制动力放大受到干扰期间使用制动愿望检测装置112的行程信号118的基本前提是,尽管存在干扰,制动力放大器120的第一电子控制器122仍正常运行,用于产生代表制动愿望检测装置112的操纵行程的行程信号118的行程传感机构116以及在机电制动力放大器120的第一电子控制器122与配属于制动压力调节装置124的第二电子控制器130之间的通信连接132也同样仍正常运行。
如果存在这些前提,则在由行程传感机构116操纵制动愿望检测装置112时,行程信号118被放置(abgesetzt)到第一电子控制器122处。在控制器122中保存有能够根据具体应用情况来确定的阈值。当超过这个阈值时,由控制器122产生一信号,该信号代表驾驶员对操纵制动愿望检测装置112的操纵。这个信号优选是二进制触发信号240(图2)。
制动力放大器120的第一电子控制器122经由未改变地功能正常的通信连接132将这个触发信号传递到制动压力调节装置124的第二电子控制器130处。然而,为此必需的是:虽然所述制动力放大本身受到干扰,叠加在触发信号240上的状态信号360(图3)仍标明“信号有效”的状态。在第二电子控制器130中,到来的触发信号被用于计算操控信号350(图3),利用该操控信号来操控制动压力调节装置124的压力产生器126,以便增强所述制动压力。
由于驾驶员在此不能够感知到由其所施加的制动力被制动压力调节装置124并且没有按照规定被制动力放大器120增强,因此,向该驾驶员显示制动力放大器120的干扰运行,优选通过在车辆驾驶员座舱中的视觉信号来显示。
在示出行程/时间曲线图的附图中示出了所提到的信号的走向。
第一信号210显示绝对行程,驾驶员利用该绝对行程来操纵制动愿望检测装置112。在此,理想情况下该信号是一直线,该直线以与水平线成倾斜角度的方式伸展。在此,所述倾斜角度取决于驾驶员加载制动愿望检测装置112所用的操纵速度。
第二信号220表示差别行程,通过该差别行程显示制动愿望检测装置112如何相对于制动力放大器120的操纵冲程运动。在开始操纵制动愿望检测装置112时,根据第一信号210的绝对行程和根据第二信号220的差别行程彼此相同,因为制动力放大器120由于所观察到的存在的干扰而不实施操纵冲程,因此只有制动愿望检测装置112被移动。然而,由于结构上的原因,制动愿望检测装置112装备有机械止挡部,该机械止挡部阻止所述差别行程在到达这个止挡部时仍继续增加。到达所述止挡部时,制动愿望检测装置112和制动力放大器120相互机械耦合并且一起继续运动。因此,自时间点t2起,所述差别行程已到达其最大值,不再增加。
在纵坐标上画出保存在第一电子控制器122中的阈值230。这个阈值230标明何时能够可靠地推断出对制动愿望检测装置112的操纵。这能够根据具体应用情况自由选择。当在时间点t1超过这个阈值230时,产生第三信号。这个第三信号是二进制触发信号240,即在阶跃函数中改变其值的信号。该信号标明驾驶员是否或者在何时操纵了制动愿望检测装置112。
图3根据流程图示出本发明所基于的方法。
在第一方法步骤310中,执行对制动力放大器120的功能检查。如果在这个功能检查中确定发生故障,则在步骤320中进一步检查现有的行程传感机构116、制动力放大器120的第一电子控制器122和在电子控制器122与130之间的通信连接132是否未改变地正常运行。如果确定这些部件116、120、132正常运行,则在发生制动过程的情况下,由第一电子控制器122在步骤330中产生与行程传感机构116的行程信号118有关的触发信号240,该触发信号代表对制动愿望检测装置112的操纵。此外,叠加在触发信号240上状态信号360被设置(gesetzt auf)为“信号有效”,从而使得利用步骤340经由功能正常的通信连接132将触发信号240传递到制动压力调节装置124的第二电子控制器130处。在那里,到来的触发信号240用作计算用于电动驱动的压力产生器126的、考虑所述制动压力放大的操控信号350的基础。然后,制动压力调节装置124的利用这个操控信号350被操控的压力产生器126为所附接的车轮制动器128供应处在对应地被增强的制动压力下的压力介质。
相反,如果在步骤310中不能够确定制动力放大器120受到功能干扰,则中断所提出的方法并且在任意的稍晚的时间点再次重复该方法。同样地,如果所述三个部件(行程传感机构116;控制器122或者通信连接132)中的至少一个部件不能够正常工作(根据步骤320的检查),则不能够执行所说明的方法,对应地中断并且必要时重复该方法。
当然,也能够考虑对所说明的实施例的改变或者补充,而不偏离本发明的基本思想。
Claims (4)
1.用于在具有机电制动力放大的、能够电子滑动调节的车辆制动系统(110)中增强制动力的方法,其中,所述车辆制动系统(110)装备有:
制动愿望检测装置(112),所述制动愿望检测装置能够被给予操纵行程,所述操纵行程与施加的制动力相关联,
制动力放大器(120),所述制动力放大器能够被第一电子控制器(122)根据所述制动愿望检测装置(112)的操纵行程驱动以执行操纵冲程,
行程传感机构(116),所述行程传感机构发射行程信号(118),所述行程信号与所述制动愿望检测装置(112)的操纵行程相关联,和
制动压力调节装置(124),所述制动压力调节装置具有第二电子控制器(130)以及能够被驱动的压力产生器(126),
其中,在所述制动力放大器(120)的第一电子控制器(122)与所述制动压力调节装置(124)的第二电子控制器(130)之间存在通信连接(132),
其特征在于,
如果在进行制动力放大时出现干扰,则检查所述行程传感机构(116)、所述制动力放大器(120)的第一电子控制器(122)和在所述控制器(122、130)之间的通信连接(132)是否正常运行,如果行程传感机构(116)、制动力放大器(120)和通信连接(132)正常运行,则由所述第一电子控制器(122)产生与所述行程传感机构(116)的行程信号(118)有关的触发信号(240),所述触发信号经由所述通信连接(132)被传输到所述第二电子控制器(130)处。
2.根据权利要求1所述的方法,
其特征在于,
二进制信号被用作触发信号(240)。
3.根据权利要求1或者2所述的方法,
其特征在于,
所述触发信号(240)被状态信号(360)叠加,所述状态信号确定这个触发信号(240)的状态。
4.根据权利要求3所述的方法,
其特征在于,
利用所述状态信号(360)能够赋予第一状态“触发信号有效”或者第二状态“触发信号无效”,并且如果在利用受干扰的制动力放大器(120)执行制动过程时已确定,所述行程传感机构(116)、所述制动力放大器(120)的第一电子控制器(122)和在所述制动力放大器(120)的第一电子控制器与所述制动压力调节装置(124)的第二电子控制器(130)之间的通信连接(132)正常运行,则分配所述第一状态。
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