CN110035937A - 车辆制动系统和方法 - Google Patents
车辆制动系统和方法 Download PDFInfo
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- CN110035937A CN110035937A CN201780077219.3A CN201780077219A CN110035937A CN 110035937 A CN110035937 A CN 110035937A CN 201780077219 A CN201780077219 A CN 201780077219A CN 110035937 A CN110035937 A CN 110035937A
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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
- 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
- B60T8/321—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
- B60T8/3255—Systems in which the braking action is dependent on brake pedal data
- B60T8/3275—Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity
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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
- 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
- B60T13/143—Master cylinder mechanically coupled with booster
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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
- 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
- B60T13/161—Systems with master cylinder
- B60T13/162—Master cylinder mechanically coupled with booster
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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
- 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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- 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
- 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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- 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
- 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
- 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
- B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- 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
- B60T8/4081—Systems with stroke simulating devices for driver input
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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
- 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
- B60T8/44—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
- B60T8/441—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters
- B60T8/442—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters the booster being a fluid return pump, e.g. in combination with a brake pedal force booster
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2400/00—Special features of vehicle units
- B60Y2400/81—Braking systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
Abstract
一种车辆制动系统包括制动踏板(32)、主缸(28)以及电控助力器(B),电控助力器(B)具有输入构件和输出构件,该输出构件适于向主缸提供输入力,该输入力组合了驾驶员供应的输入力和由电控助力器提供的助动力。轮缸(36)流体地联接到主缸(28)的出口,并且可操作以向主缸提供与输入力成比例的轮制动力。泵(60‑1、60‑2)可操作以将流体朝向轮缸泵送,以提供辅助轮制动力。控制器(40)被编程为触发液压制动辅助例程,在液压制动辅助例程中,泵被激活以提供辅助轮制动力。控制器被编程为在液压制动辅助例程期间减小由电控助力器提供的助动力。
Description
技术领域
本公开涉及车辆制动系统。特别地,本发明涉及一种包括电控助力器的车辆制动系统和一种在车辆制动系统的操作期间控制电控助力器的方法。
发明内容
在一个方面中,本发明提供了一种车辆制动系统,所述车辆制动系统包括制动踏板、主缸以及电控助力器,电控助力器具有联接到制动踏板的输入构件并且具有输出构件,该输出构件联接到主缸并且适于向主缸提供输入力,该输入力组合了由输入构件提供的驾驶员供应的输入力和由电控助力器提供的助动力。轮缸流体地联接到主缸的出口,并且可操作以向主缸提供与输入力成比例的轮制动力。泵可操作以将流体朝向轮缸泵送,以提供辅助轮制动力。控制器被编程为触发液压制动辅助例程,在液压制动辅助例程中,泵被激活以当在主缸出口和轮缸之间进行流体连通时提供辅助轮制动力。控制器被编程为在液压制动辅助例程期间减小由电控助力器提供的助动力。
在另一个方面中,本发明提供了一种操作车辆制动系统的方法。提供电控助力器,该电控助力器具有联接到制动踏板的输入杆并且具有联接到主缸的输出杆。感测由制动踏板供应给助力器输入杆的驾驶员输入。从电控助力器提供助动力以补充由驾驶员输入供应的力,使得由驾驶员输入供应的力和助动力相组合以产生由助力器输出杆施加到主缸的总输出力。通过液压流体将总输出力从主缸输送到至少一个轮缸,以提供车辆制动力。将至制动踏板的驾驶员输入识别为紧急制动需求。响应于识别出紧急制动需求来致动泵以向至少一个轮缸提供辅助轮制动力。致动电控助力器以在泵的致动以提供辅助轮制动力期间减小助动力。
通过考虑详细描述和附图,本公开的其他方面将变得明显。
附图说明
图1是根据本发明的一个实施例的车辆制动系统的示意图。
图2是电控助力器的示意图,该电控助力器操作地联接在图1的车辆制动系统的制动踏板和主缸之间。
具体实施方式
在详细解释本公开的任何实施例之前,将理解,本公开在其应用方面并不限于在以下描述中阐述的或者在以下附图中图示的部件的构造和布置的细节。本公开能够具有其他实施例并且能够以各种方式实践或实施。
图1中图示了车辆制动系统20。制动系统20设置在轮式车辆中,并且能够具有防抱死制动功能以用于防止在硬制动事件或在低摩擦表面上制动下的车轮抱死和打滑。制动系统20包括在主缸28和多个轮缸36之间的多个独立液压制动回路26A、26B。如下文进一步详细讨论的,主缸28可以由用户可操作的制动踏板32结合助力器B致动。制动回路26A、26B物理地设置在液压单元24中。在所图示的构造中,制动回路26A、26B提供前/后分割,并且包括联接到前轮LF、RF的第一或主回路26A以及联接到后轮LR、RR的第二或次(secondary)回路26B。尽管轮缸36在图1中被示为与盘式制动系统的卡钳合并,但是可在每个车轮处设置其他类型的液压制动系统。液压制动回路可控制对来自轮缸36的液压流体压力的选择性释放,使得保持低于牵引力极限的制动力。多个传感器联接到制动系统20的控制器40以提供输入信息(包括车轮速度、踏板行程、回路流体压力等),使得控制器40可以控制液压单元24的操作。液压单元24还可被构造成提供制动力分配和/或牵引力控制以作为车辆的整体电子稳定程序(ESP)的一部分,因为已经通过制动系统20提供了许多相同的硬件部件。尽管液压单元24可以用于具有防抱死和其他功能的汽车制动系统中,但其应用并不限于此类系统。
如图1中所示,主液压制动回路26A包括与主缸28的主室C1的出口流体连通的入口管线44(来自主缸28的主出口的输出管线)(图4)。入口管线44与先导阀48(例如,常开的电磁控制的2位置阀)、高压开关阀52(例如,常闭的电磁控制的2位置阀)和压力传感器54连通。先导阀48的出口通过并行压力管线59上的相应入口阀58(例如,常开的电磁控制的2位置阀)联接到两个前轮缸36。每个前轮缸36还经由并行释放管线63上的相应出口阀62(例如,常闭的电磁控制的多位置阀)联接到泵60-1的吸入侧。泵60-1可以包括一个或多个泵元件(例如,三个元件)。可以由控制器40在多种打开位置之间控制出口阀62,以放掉来自轮缸36的被认为是过度的或很可能超过牵引力极限的压力。蓄积器64(例如,低压蓄积器)并联联接在出口阀62和泵60-1之间,并且被构造成在来自(一个或多个)出口阀62的流体被泵60-1移除和返回之前接收并临时存储所述流体。泵60-1由马达70驱动。马达70与助力器B以及主回路26A和次回路26B的所有电控阀一起可以电联接到控制器40。
次液压制动回路26B包括与主缸28的次室C2的出口流体连通的入口管线80(来自主缸28的次输出端的输出管线)(图4)。入口管线80与入口管线44流体地分离,使得主回路26A和次回路26B可以向每组相应的轮缸(所述轮缸在所图示的构造中被分离为前轮轴和后轮轴)提供单独的独立制动。入口管线80与分离阀84(例如,常开的电磁控制的2位置阀)连通。分离阀84的出口通过并行压力管线59上的相应入口阀58(例如,常开的电磁控制的2位置阀)联接到两个后轮缸36。每个后轮缸36还经由并行释放管线63上的相应出口阀62(例如,常闭的电磁控制的多位置阀)联接到泵60-2的吸入侧。泵60-2可以包括一个或多个泵元件(例如,三个元件)。可以由控制器40在多种打开位置之间控制出口阀62,以放掉来自轮缸36的被认为是过度的或很可能超过牵引力极限的压力。泵60-2由马达70驱动(例如,与主制动回路26A的泵60-1共同驱动)。泵60-2的压力侧通过返回管线90上的压力控制调节器阀88(例如,常闭的电磁控制的多位置阀)联接到主缸28的储器R。
现在转向主缸28,室C1、C2中的每一者是如由相应的第一活塞P1和第二活塞P2控制的可变容积室。制动踏板32通过助力器B来致动第一活塞P1,该助力器B是如下文所描述的电控助力器。第二活塞P2是浮动活塞,其仅通过第一活塞P1的移动而被间接地致动。制动踏板32联接到用作至助力器B的输入构件的杆94(本文中被称为助力器输入杆),该联接是直接的而其间没有任何中间助力器。第一活塞P1联接到用作助力器B的输出构件的杆95(本文中被称为助力器输出杆),使得第一活塞P1随着助力器输出杆95的移动而移动。助力器B被构造成使得在低于阈值或“切入(cut-in)”力的情况下,来自制动踏板32的致动的力被传递到助力器输出杆95和第一活塞P1而没有另外的助动力,并且在高于切入力的情况下,来自制动踏板32的致动的在助力器输出杆95上的力仅构成被传递到助力器输出杆95和第一活塞P1的总力的一部分,因为制动器B提供了剩余部分。为了施加助力器辅助的制动,由踏板行程传感器74检测制动踏板32或助力器输入杆94的行程量,并且该行程量被报告给控制器40。对应的控制器输出被发送到助力器B以将某个力施加到输出杆95,该力将被加到来自制动踏板32的助力器输入杆94的驾驶员供应的力。在车辆制动系统20的正常操作或主操作模式期间,助力器B主动地辅助驾驶员在主缸28内产生流体压力,以在轮缸36处实现目标制动力且因此实现与驾驶员施加的力成比例的目标车辆减速率。助力器B可根据预定算法来操作以实现预定的助力因子,该助力因子由从助力器B输出到主缸的总力相对于驾驶员供应的力来限定。
如图1中所示并且在图2中进一步详细所示的,助力器B可以是机电助力器,其包括助力器马达97、传动装置98以及可由助力器马达97通过传动装置98驱动的助力体99。助力体99联接到助力器输出杆95。如图2中所示,助力体99可以通过阀体100和弹性体反作用盘102联接到输出杆95。在所图示的构造中,传动装置98包括联接到助力器马达97的输出端的驱动螺杆和形成在助力体99上的外螺纹,但是其他布置是可选的。复位弹簧96使助力器输出杆95且因此使助力体99远离主缸28偏置。当助力器输入杆94未由制动踏板32致动时,切入弹簧104使助力器输入杆94远离阀体100偏置到初始或原始位置。在正常操作模式中,切入弹簧104的变形允许助力器输入杆94接触弹性体反作用盘102的中心部分,该中心部分继而将力传输到助力器输出杆95。同时,弹性体反作用盘102的外周边部分由阀体100致动,该阀体100由助力器马达97通过助力体99驱动。控制器40可以被编程为使得阀体100的移动跟随或跟踪助力器输入杆94的移动。因此,助力器B的助力因子可以由反作用盘102的致动区域的比率限定。在倒车(back-up)或故障保护操作模式中(其中助力器B不可操作来辅助致动主缸28),助力器输入杆94与阀体100邻接并且至少部分地通过阀体100来致动助力器输出杆95。
如下文所描述的,控制器40可以被编程为控制助力器B以在制动辅助例程期间调整制动踏板施加的力与助力器施加的力的比率(即,减小助力器施加的力),使得即使当第一主缸室C1中发生大幅度的压降时驾驶员也不会觉察到踏板反作用力的变化。当制动踏板32由驾驶员致动时,控制器40确定制动踏板32被致动多远以及输入被多么快地供应给制动踏板32。当制动踏板32和助力器输入杆94具有预定的运动学关系时,可以从利用踏板行程传感器74观察助力器输入杆94的位置或行程来确定这些值。控制器40还可考虑其他输入或因素,包括但不限于主缸28或回路26A、26B内的流体压力、或设置在车辆上的防撞传感器。基于这些输入中的一些或全部,控制器40被编程为识别对液压制动辅助例程的需求并触发对液压制动辅助例程的实施,借以当泵60-1与主缸室C1和第一回路26A的相应轮缸36流体连通时操作该泵60-1。在一个方面中,在控制器40将驾驶员的制动请求识别为紧急制动请求同时进一步识别驾驶员的输入即使具有助力也是不够的情况下,可以触发液压制动辅助例程,以实现最大制动力和减速度。因此,液压制动辅助例程通过致动泵60-1来辅助正常制动,以实现最大制动力和减速度。在一些构造中,控制器40可计算从助力器B到主缸28的输出是否能够触发防抱死制动操作,并且当控制器40确定它不会时,控制器40可制定液压制动辅助例程以使车辆制动系统20进入防抱死制动操作中。在其他构造中,当制动系统20经历“衰减”(即,由于过热所引起的制动衬片的相互摩擦减小)时,可触发液压制动辅助例程,在“衰减”期间,相对于给定的主缸压力或轮缸力经历了制动扭矩的减小。
当在液压制动辅助例程期间操作泵60-1时,由于第一回路26A的泵60-1不直接连接到流体储器R,因此流体从主缸室C1被吸取到泵60-1的吸入侧。因此,液压制动辅助例程导致室C1内的流体压力降低,这继而导致从主缸28内部的流体施加到助力器输出杆95的反作用力FTMC减小。当流体由泵60-1抽空以供应给轮缸36时,助力器输出杆95还可进一步前进到主缸28中。由助力器输出杆95施加的反向力FOUT也响应于液压制动辅助例程而下降。在没有对策的情况下,这导致从助力器输入杆94到制动踏板32的反作用力(与图2的输入力FIN相等且相反的力)突然下降,这给驾驶员的印象是他们没有制动或者他们失去了与制动踏板32的接触。一些驾驶员还可具有虽然他们没有制动但是制动辅助仍然有效的印象。为了适应主缸28和助力器输出杆95之间的力FTMC、FOUT的必要减小而输入力FIN和至制动踏板32的对应反作用力没有相应地减小,控制器40被编程为减小助动力FBOOST。
可以计算助动力减小量以对应于主缸28内的压降,使得当驾驶员保持制动踏板32的下压时,液压制动辅助例程对他们来说是难以觉察的。因而,总输出力FOUT中的由驾驶员供应的相对部分实际上增加。通过经由助力减小使驾驶员对至主缸的总输出更负责,即使在制动踏板仍然联接到回路26A时,液压制动辅助例程也可操纵回路26A中的流体压力,而不影响对制动踏板32的感觉。这可以在液压制动辅助例程和整体驾驶体验期间改善驾驶员的信心和满意度。控制器40可被编程为在预定范围或阈值内执行与主缸压力减小成比例的助动力减小,使得在液压制动辅助例程期间助动力所能被减小的量存在有限的极限或上限。该极限可以确保助力器B在任何情况下都不会违背驾驶员至制动踏板32的输入来致动。
在以下权利要求中阐述了本公开的各种特征和优点。
Claims (18)
1.一种车辆制动系统,包括:
制动踏板;
主缸;
电控助力器,其具有联接到所述制动踏板的输入构件并且具有输出构件,所述输出构件联接到所述主缸并且适于向所述主缸提供输入力,所述输入力组合了由所述输入构件提供的驾驶员供应的输入力和由所述电控助力器提供的助动力;
轮缸,其流体地联接到所述主缸的出口并且可操作以向所述主缸提供与所述输入力成比例的轮制动力;
泵,其可操作以将流体朝向所述轮缸泵送,以提供辅助轮制动力;以及
控制器,其被编程为触发液压制动辅助例程,在所述液压制动辅助例程中,所述泵被激活以当在所述主缸出口和所述轮缸之间进行流体连通时提供所述辅助轮制动力,
其中,所述控制器被编程为在所述液压制动辅助例程期间减小由所述电控助力器提供的所述助动力。
2. 根据权利要求1所述的车辆制动系统,其中,所述控制器被编程为当发生以下情况时触发所述制动辅助例程:
基于所述制动踏板的致动速度和致动量中的一者或两者识别出正在请求紧急制动;以及
识别出至所述主缸的所述输入力不足以最大化减速度。
3.根据权利要求1所述的车辆制动系统,其中,所述电控助力器的所述输出构件联接到能够由电马达驱动的助力体以用于接收所述助动力。
4.根据权利要求3所述的车辆制动系统,其中,所述助力体绕阀体同心地布置,所述输入构件被可滑动地接收于所述阀体中。
5.根据权利要求1所述的车辆制动系统,其中,所述电控助力器包括弹性体反作用盘,所述助动力和所述驾驶员供应的输入力两者通过所述弹性体反作用盘被施加到所述输出构件。
6.根据权利要求1所述的车辆制动系统,其中,所述轮缸被第一流体回路联接到所述主缸的第一室,所述车辆制动系统还包括至少一个另外的轮缸,所述至少一个另外的轮缸被第二流体回路联接到所述主缸的第二室。
7.根据权利要求6所述的车辆制动系统,其中,所述泵是第一泵,并且其中,所述第二流体回路包括第二泵,所述第二泵具有联接到流体储器的吸入侧。
8.根据权利要求1所述的车辆制动系统,其中,所述控制器被编程为在开始所述液压制动辅助例程的同时开始减少助动力。
9.根据权利要求1所述的车辆制动系统,其中,所述控制器被编程为在所述液压制动辅助例程期间与由所述泵的致动造成的流体压力减小成比例地减小助动力。
10.根据权利要求1所述的车辆制动系统,其中,所述电控助力器的所述输入构件直接联接到所述制动踏板而没有任何中间助力器。
11.一种操作车辆制动系统的方法,所述方法包括:
提供电控助力器,所述电控助力器具有联接到制动踏板的输入杆并且具有联接到主缸的输出杆;
感测由所述制动踏板供应给所述助力器输入杆的驾驶员输入;
从所述电控助力器提供助动力以补充由所述驾驶员输入供应的力,使得由所述驾驶员输入供应的所述力和所述助动力相组合以产生由所述助力器输出杆施加到所述主缸的总输出力;
通过液压流体将所述总输出力从所述主缸输送到至少一个轮缸,以提供车辆制动力;
将至所述制动踏板的所述驾驶员输入识别为紧急制动需求;
响应于识别出所述紧急制动需求来致动泵以向所述至少一个轮缸提供辅助轮制动力;以及
致动所述电控助力器以在所述泵的致动以提供所述辅助轮制动力期间减小所述助动力。
12.根据权利要求11所述的方法,其中,所述驾驶员输入由所述制动踏板供应给所述助力器输入杆而没有任何中间助力器。
13.根据权利要求11所述的方法,其中,至所述制动踏板的所述驾驶员输入根据制动踏板下压量和制动踏板应用速度中的一者或两者而被识别为紧急制动需求。
14.根据权利要求11所述的方法,还包括:不管所述主缸内的流体压力下降,贯穿所述泵的致动而将所述助力器输入杆处的一致的踏板反作用力保持等于由所述驾驶员输入供应的力。
15.根据权利要求14所述的方法,其中,所述助动力被减小与所述主缸内的所述流体压力下降成比例的量。
16.根据权利要求11所述的方法,其中,在开始致动所述泵的同时开始减少所述助动力。
17.根据权利要求11所述的方法,其中,在同时进行的泵致动和助动力减小期间增加所述至少一个轮缸处的所述总制动力。
18.根据权利要求11所述的方法,还包括将所述助动力的减小量限制到预定的最大量,以保证所述电控助力器不会违背所述驾驶员输入来致动。
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JP2020513376A (ja) | 2020-05-14 |
US20180162336A1 (en) | 2018-06-14 |
US10099670B2 (en) | 2018-10-16 |
KR102430147B1 (ko) | 2022-08-08 |
EP3554902A1 (en) | 2019-10-23 |
CN110035937B (zh) | 2021-08-31 |
EP3554902B1 (en) | 2020-08-19 |
JP6756920B2 (ja) | 2020-09-16 |
KR20190098140A (ko) | 2019-08-21 |
WO2018108348A1 (en) | 2018-06-21 |
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