CN102883927A - 用于调节尤其是机动车用液压制动***中的间隙的方法 - Google Patents
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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
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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
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- 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
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Abstract
本发明涉及一种用于调节液压制动***(1)的间隙的方法。根据本发明,执行如下方法步骤:a)借助于配属于液压泵(3)的位置传感器检测泵部件的第一旋转位置;b)通过借助于作为控制变量的PWM信号在步进式电机运行期间控制电机(4),泵部件的预定的目标旋转角使泵部件旋转至第二旋转位置,从而在轮制动器的压力腔中通过经由在抽吸侧与压力腔的液压连接从压力腔中抽吸由泵部件的预定的目标旋转角确定的制动介质的体积而产生导致活塞复位的压力降低,其中借助于位置传感器来检测第二旋转位置,且根据基于第二旋转位置确定的实际旋转角与目标旋转角的偏差来确定控制变量。
Description
技术领域
本发明涉及一种根据权利要求1的前序部分所述的、用于调节尤其是用于机动车的液压制动***中的间隙(制动间隙)的方法。
背景技术
在尤其具有盘式制动器的制动***中,当制动活塞上的复位力不足以使制动器摩擦衬片足够远地离开制动盘时,在制动过程之后可能出现剩余制动效应。由此产生的摩擦功率对机动车的燃料消耗具有不利影响。
此外,为了解决该问题研究出一种回卷密封件,其在制动过程结束后使制动活塞运动并借助于制动活塞使制动器摩擦衬片离开制动盘。然而,制动活塞上的密封环的回卷能力是有限的且不足以完全补偿制动卡钳中和摩擦衬片上的污物、老化和弹性形变。此外,为了产生回卷(也称为间隙),该活塞密封件具有极高的公差,进而因此不能始终确保适当的间隙。
DE 102008051316A1公开了一种用于机动车的制动***,其中借助于压力降低可以在轮制动器的液压供给管路中产生或设定间隙,从而借助于压力降低有效地使轮制动器的制动活塞复位,其中压力降低的大小和其持续时间引起活塞的确定的调节并进而得到确定的间隙。压力降低可以或者借助于主制动缸产生或者借助于与相关轮制动器的液压供给管路连接的额外的组件产生。
已知的这种方法的缺点是存在制动活塞回退过度的危险,从而在紧急情况下需要过长的制动踏板行程,该过长的制动踏板行程将导致制动功率损失。
发明内容
本发明的目的在于,进一步改进这种已知的用于调节液压制动***的间隙的方法,使得在所有运行条件下都能够实现确定的间隙设定。
该目的通过具有权利要求1所述的特征的方法来实现。
在用于调节尤其用于机动车的液压制动***的间隙的这种方法中,该机动车包括
-至少一个具有制动活塞的制动卡钳,该制动卡钳可以借助于制动件进入摩擦接合状态,
-液压泵,所述液压泵可与制动卡钳的压力腔液压连接,以移动制动卡钳的制动活塞,以及
-驱动液压泵的电机,该电机使可旋转的泵部件处于旋转运动中以输送制动介质,
根据本发明,执行如下方法步骤:
a)借助于配属于液压泵的位置传感器检测泵部件的第一旋转位置;
b)通过借助于作为控制变量的PWM信号在步进式电机运行中控制电机,泵部件的预定的目标旋转角使泵部件旋转至第二旋转位置,从而
-通过经由在抽吸侧与压力腔的液压连接从压力腔中抽吸由泵部件的预定的目标旋转角确定的制动介质的体积而在压力腔中产生使活塞复位的压力降低,其中
-借助于位置传感器来检测第二旋转位置,并且
-根据基于第二旋转位置确定的实际旋转角与目标旋转角的偏差来确定控制变量。
据此,根据本发明的方法的特征在于,借助于布置在液压泵中的位置传感器,能够精确地确定由PWM信号引起的液压泵的旋转的旋转角,并进而也可以精确地确定泵活塞的位置。因此,利用由位置传感器的传感器信号确定的该旋转角,也已知了从制动卡钳的压力腔中抽吸的制动介质的体积,该体积对应于特定的间隙。通过在步进式电机运行中控制电机,从压力腔抽吸出的体积被分成足够小的份,从而能够精确地设定期望的间隙。
优选地,位置传感器既可以布置在液压泵中或上,也可以布置在电机中,其中感应的传感器尤其适合于此。
根据本发明的方法作为算法在制动***的制动控制单元中执行,从而除了泵位置传感器之外不需要额外的部件用于该方法的实施。
由从属权利要求的特征得到根据如权利要求1所述的发明的制动***的有利的设计方案。
附图说明
下面参考唯一的附图1更详细地说明和描述根据本发明的方法,该附图1示出了用于执行根据本发明的方法的、用于车辆的液压制动***。
具体实施方式
图1中示出的制动***1仅示出了用于左前轮10和右后轮11的、连接至制动缸(串联主缸/双活塞主缸,THZ)9的单个制动回路,第二制动回路相对应地构造并且同样通过与阀块12连接的液压管线连接至制动缸9。车轮10和11的具有制动卡钳的轮制动器2或2’同样通过液压管线连接至阀块12。
制动***1具有与制动缸9连接的制动助力器13和用于制动液或液压流体的贮存容器5。制动缸9在出口侧产生对应于与制动助力器13连接且由驾驶员操纵的制动踏板(未示出)的制动压力。该制动压力通过打开的分离阀15分别在入口侧供给/输入至打开的入口阀7或7’,因此可以借助于制动卡钳2和2’在车轮10和11处建立相应的制动压力。两个入口阀7和7’通常在无电流的情况下打开。
通常在无电流的情况下关闭的出口阀8或8’使轮制动器2或2’和低压蓄存器14相连接,该低压蓄存器14又与液压泵3在抽吸侧连接且可以通过切换阀6与制动缸9连接。
为轮制动器2和2’设置了液压泵3,以便例如在ABS干涉或ESP干涉的情况下再次输出当压力下降时转移至低压蓄存器中的制动介质。
液压泵3——例如布置在阀块12中或上的离心泵——由电机4驱动,电机4又通过控制单元(未示出)以脉冲宽度调制(PWM)的方式控制。如此控制电机4,使得液压泵3通过在抽吸侧抽吸制动液而能够在高压侧建立制动压力。
液压泵3配备了位置传感器,该位置传感器检测液压泵3的旋转的偏心泵部件的位置,即旋转位置。该位置传感器既可以定位在液压泵3中或上,也可以定位在电机4中。因此,在借助于引起泵部件的确定的旋转的PWM脉冲在步进式电机运行中控制电机4之后,可以借助于位置传感器检测新的旋转位置并可与在旋转之前确定的旋转位置一起确定实际的旋转角。利用已知的旋转角不仅可以计算出排出的液压流体的体积,还可以计算出由液压泵3经由至制动卡钳2或2’的压力腔的液压连接抽吸出的体积。至压力腔的液压连接通过打开的出口阀8或8’建立。
因此,可以通过利用相应地控制电机4来控制旋转角而从制动卡钳2或2’的压力腔抽吸出与旋转角成比例的体积,从而基于由此产生的压力腔中的压力降低而以限定的方式使制动活塞返回。可以基于已知的横截面将抽吸出的体积转换为间隙。
由于在步进式电机运行中控制液压泵3,所以能把由压力腔抽吸出的体积分成足够小的份,从而高精确度地设定期望的间隙。
例如,当在轮制动器2和2’中压力已被解除且进而不再存在制动压力之后,根据每个由驾驶员执行的制动过程进行间隙的调节。
首先,借助于位置传感器确定液压泵3的旋转位置,接着利用具有预定的脉冲占空因数的PWM脉冲来控制电机4,其中PWM脉冲对应于由控制单元预先给出的目标旋转角,从而由此在入口阀7关闭时通过出口阀8抽吸出对达到期望的间隙来说必要的体积,并在入口阀7之前输入制动回路中,从而该体积可以通过制动缸9流回贮存容器5中。
利用该预定的PWM脉冲的控制使液压泵3旋转至一旋转位置中,借助于位置传感器确定该旋转位置以确定实际的旋转角,即旋转角的实际值。基于实际旋转角与目标旋转角的偏差,借助于另一个具有较大的脉冲占空因数的PWM脉冲来控制电机。一直进行这种控制,直至在预定的公差的范围内出现实际值-目标值一致。
为了当在步进式电机运行中控制液压泵3时能够从制动卡钳2或2’的压力腔中抽出制动液,切换阀6和入口阀7或7’关闭,同时出口阀8或8’打开从而建立至压力腔的连接。
可以在驾驶员不操纵制动器时对每个车轴或每个单独的车轮执行这种用于调节间隙的方法。
只有当存在正的发动机力矩时,才适合执行该方法。
当在驾驶员的每个制动过程之后实施该方法时,车辆不应处于静止状态中。
当然也可以在有效建立制动压力之后执行该方法。
该方法作为算法存储在制动***的控制单元中。
当低压蓄存器14为空或近似为空且进而不能把制动介质输送返回制动回路时,还可以借助于布置在液压泵3中的位置传感器来保护该低压蓄存器14。从低压蓄存器14取出的体积同样可以根据借助于位置传感器检测出的液压泵3的旋转位置确定。为了防止制动活塞非控制地回退,当通过相应的传感***或通过压力模块检测到近似为0bar的轮制动缸压力时,关闭出口阀。
附图标记列表
1液压制动***
2左前轮10的制动卡钳或轮制动器
2’右后轮11的制动卡钳或轮制动器
3液压泵
4电机
5贮存容器
6切换阀
7制动卡钳2的入口阀
7’制动卡钳2’的入口阀
8制动卡钳2的出口阀
8’制动卡钳2’的出口阀
9制动缸
10左前轮
11右后轮
12阀块
13制动助力器
14低压蓄存器
15分离阀
Claims (8)
1.一种用于调节尤其是用于机动车的液压制动***(1)中的间隙的方法,所述液压制动***包括:
-至少一个具有制动活塞的制动卡钳(2),所述制动卡钳能够借助于制动件进入摩擦接合状态,
-液压泵(3),所述液压泵能够与所述制动卡钳(2)的压力腔液压连接,以移动所述制动卡钳的制动活塞,以及
-驱动所述液压泵(3)的电机(4),所述电机使可旋转的泵部件处于旋转运动中以输送制动介质,
其特征在于,所述方法包括如下方法步骤:
a)借助于配属于所述液压泵(3)的位置传感器检测泵部件的第一旋转位置;
b)通过借助于作为控制变量的PWM信号在步进式电机运行中控制所述电机(4),所述泵部件的预定的目标旋转角使所述泵部件旋转至第二旋转位置,从而
-通过经由在抽吸侧与所述压力腔的液压连接从所述压力腔中抽吸由泵部件的预定的目标旋转角确定的制动介质的体积而在所述压力腔中产生导致活塞复位的压力降低,其中
-借助于所述位置传感器来检测所述第二旋转位置,并且
-根据基于所述第二旋转位置确定的实际旋转角与目标旋转角的偏差来确定所述控制变量。
2.根据权利要求1所述的方法,其特征在于,根据方法步骤b)的控制以作为控制变量的、具有预定的脉冲占空因数的PWM信号为开始,并且必要时随后的控制步骤中的PWM信号具有增大的脉冲占空因数。
3.根据权利要求1或2所述的方法,其特征在于,在所述方法步骤a)和b)期间,所述液压制动***的贮存容器(5)经由切换阀(6)与所述液压泵(3)隔离。
4.根据上述权利要求中任一项所述的方法,其特征在于,在所述方法步骤a)和b)期间,与所述制动卡钳(2)的压力腔连接的入口阀(7)关闭。
5.根据上述权利要求中任一项所述的方法,其特征在于,在所述方法步骤a)和b)期间,与所述制动卡钳(2)的压力腔连接的出口阀(8)打开。
6.根据上述权利要求中任一项所述的方法,其特征在于,在每次制动过程之后和/或在每次有效的制动压力建立之后执行所述方法步骤a)和b)。
7.根据上述权利要求中任一项所述的方法,其特征在于,所述位置传感器布置在所述液压泵(3)中、布置在所述液压泵(3)上或者布置在所述电机(4)中。
8.根据上述权利要求中任一项所述的方法,其特征在于,所述位置传感器设计为感应传感器。
Applications Claiming Priority (3)
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DE102010028909A DE102010028909A1 (de) | 2010-05-12 | 2010-05-12 | Verfahren zur Lüftspieleinstellung einer hydraulischen Bremsanlage, insbesondere für ein Kraftfahrzeug |
DE102010028909.4 | 2010-05-12 | ||
PCT/EP2011/057602 WO2011141507A1 (de) | 2010-05-12 | 2011-05-11 | Verfahren zur lüftspieleinstellung einer hydraulischen bremsanlage; insbesondere für ein kraftfahrzeug |
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CN102883927A true CN102883927A (zh) | 2013-01-16 |
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CN2011800235410A Pending CN102883927A (zh) | 2010-05-12 | 2011-05-11 | 用于调节尤其是机动车用液压制动***中的间隙的方法 |
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US (1) | US20130140115A1 (zh) |
EP (1) | EP2569193A1 (zh) |
KR (1) | KR20130067278A (zh) |
CN (1) | CN102883927A (zh) |
DE (1) | DE102010028909A1 (zh) |
WO (1) | WO2011141507A1 (zh) |
Cited By (1)
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CN110920595A (zh) * | 2019-10-28 | 2020-03-27 | 上海汇众汽车制造有限公司 | 电卡钳制动间隙估算方法 |
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DE102011087118B4 (de) * | 2011-11-25 | 2016-10-06 | Ford Global Technologies, Llc | Verfahren zum Betrieb eines Bremssystems eines Fahrzeuges, Bremssystem für ein Fahrzeug und Fahrzeug |
US8899030B2 (en) * | 2011-12-13 | 2014-12-02 | Continental Automotive Systems, Inc. | Method of using a pump position sensor for an EBS pump check |
DE102012018955A1 (de) | 2012-02-10 | 2013-03-14 | Daimler Ag | Niederdruckspeicher für ein hydraulisches Bremssystem eines Fahrzeugs mit Rekuperationsfunktionalität und Verfahren zum Betrieb eines solchen Niederdruckspeichers |
DE102012023790A1 (de) * | 2012-12-05 | 2014-06-05 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Bremsvorrichtung, Kraftfahrzeug und Verfahren |
DE102015220249A1 (de) | 2015-10-16 | 2017-04-20 | Continental Automotive Gmbh | Verfahren zum automatisierten Führen eines mit einem Fahrer besetzten Kraftfahrzeugs und zur Information des Fahrers |
DE102016218337A1 (de) * | 2016-09-23 | 2018-03-29 | Continental Teves Ag & Co. Ohg | Verfahren zum Betreiben eines Bremssystems |
US10363912B2 (en) * | 2017-03-09 | 2019-07-30 | Ford Global Technologies, Llc | Hydraulic brake actuators and related methods |
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- 2011-05-11 EP EP11720749A patent/EP2569193A1/de not_active Withdrawn
- 2011-05-11 KR KR1020127032540A patent/KR20130067278A/ko not_active Application Discontinuation
- 2011-05-11 US US13/697,427 patent/US20130140115A1/en not_active Abandoned
- 2011-05-11 WO PCT/EP2011/057602 patent/WO2011141507A1/de active Application Filing
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EP2569193A1 (de) | 2013-03-20 |
WO2011141507A1 (de) | 2011-11-17 |
US20130140115A1 (en) | 2013-06-06 |
DE102010028909A1 (de) | 2011-11-17 |
KR20130067278A (ko) | 2013-06-21 |
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