WO2021258702A1 - 一种汽车制动器所需液量测试方法 - Google Patents

一种汽车制动器所需液量测试方法 Download PDF

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WO2021258702A1
WO2021258702A1 PCT/CN2020/141263 CN2020141263W WO2021258702A1 WO 2021258702 A1 WO2021258702 A1 WO 2021258702A1 CN 2020141263 W CN2020141263 W CN 2020141263W WO 2021258702 A1 WO2021258702 A1 WO 2021258702A1
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brake
pedal
pressure
testing
fluid volume
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PCT/CN2020/141263
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English (en)
French (fr)
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李磊
蒋帅
彭凯
杨永健
张建斌
隋清海
郝占武
史亨波
孙曙光
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中国第一汽车股份有限公司
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Publication of WO2021258702A1 publication Critical patent/WO2021258702A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts

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  • the invention relates to a method for testing the required fluid volume of an automobile brake, which can be used to provide a test basis for the optimization of the comfort of a brake pedal, and belongs to the technical field of brake design.
  • the amount of fluid required for the brake has an important influence on the comfort of the brake pedal.
  • the engineer cannot lock without disassembling the brakes. Specifically, which of the four brakes on the car has a problem.
  • Patent Document 1 discloses a P-V relationship test method for brakes, which is an analysis method that predicts the P-V relationship before the actual development is completed. The main idea is to determine the brake gap ⁇ and brake rigid deformation ⁇ s under the set brake pressure; determine the original brake fluid demand Vy under the set pressure; determine the original brake fluid demand Vy The theoretical brake fluid demand V1; the final brake fluid demand Vz is determined by the theoretical brake fluid demand V1. It can be seen that this patent is a theoretical method for predicting the P-V relationship of the brake, rather than measuring the required fluid of the brake in the actual working conditions of the vehicle.
  • Patent Document 2 discloses a brake fluid requirement test device for an automobile brake system, which is used to measure the brake fluid requirement of a small flow and large pressure.
  • the device is mainly composed of a cavity tube, a linear displacement sensor, an I-shaped piston and a metal rod.
  • the two ends of the cavity tube are respectively screwed to the interface of the brake hard tube and the brake hose; in the cavity tube
  • a metal rod is vertically installed on the connecting rod of the I-shaped piston;
  • a linear displacement sensor is provided on the top of the metal rod, and the linear displacement sensor
  • the slider and the top of the metal rod are fixed together; the linear displacement sensor is fixedly connected with the inner wall of the cavity tube.
  • This patent is a bench test method for measuring the amount of brake fluid required, rather than measuring the fluid required by the brake in the actual working conditions of the vehicle.
  • Patent Document 3 discloses a hydraulic brake caliper comprehensive performance test bench liquid consumption test device and test method, the essence of which is that the rotary motion can be converted into linear motion through a ball screw, and the linear feed is transmitted to the clutch
  • the push rod of the master pump and the test component have a simple and practical structure.
  • the servo motor connected to the reducer is connected to the ball screw through a coupling, which is simple and reliable.
  • the test loading mechanism has a simple structure and high precision, and is equipped with a zero adjustment device.
  • the fixed components of the liquid consumption test device are fast and accurate.
  • the fixed component of the liquid consumption testing device has a simple structure, and the positioning is accurate and convenient.
  • This patent is a bench test method for measuring the amount of brake fluid required, rather than measuring the fluid required by the brake in the actual working conditions of the vehicle.
  • the prior art is mainly based on theoretical predictions and bench tests, and they cannot accurately grasp the gap between the friction lining and the brake disc after a certain mileage of the vehicle, and therefore cannot accurately determine the amount of fluid required for the brake.
  • the present invention Provides a method for testing the required fluid volume of automobile brakes, which can accurately determine the required fluid volume of the brake without disassembling the brake. It provides great help to solve the problem of vehicle brake pedal feel, optimize the bench test method, and optimize the brake design.
  • a method for testing the required fluid volume of automobile brakes By calculating the difference between the pedal stroke of the brake pipeline before and after the oil circuit is closed under the same oil pressure, the corresponding brake requirement under the oil pressure value is calculated. Liquid volume.
  • the present invention includes the following steps:
  • Step 1 Equipment installation and debugging, used for pedal stroke measurement, master cylinder pressure signal measurement, and control the closing of the four outlet valves of the body stability control system;
  • Step 2 Run the vehicle according to the working conditions to be tested
  • Step 3 Measured pedal stroke-pressure curve 1: Depress the brake pedal in place, select multiple oil pressure values to test, and record the brake pressure P and pedal stroke S1 of each test;
  • Step 4 Measured pedal stroke-pressure curve 2: Close a certain brake pipe outlet valve of the body stability control system control unit, step on the brake pedal, and read the stroke S2 of each oil pressure value in step three;
  • Step 5 Calculation of brake fluid demand:
  • a pedal displacement measuring device is installed at the brake pedal to measure the pedal stroke.
  • a CAN development tool is connected to read the pressure signal of the master cylinder on the CAN bus and control the closing of the four outlet valves of the ESP.
  • the CAN development tool uses Alyzer.
  • the main cylinder pressure is read by an external hydraulic sensor and corresponding equipment at the oil inlet of the body stability control system, and the outlet valve is closed by using a threaded metal plug to block the oil outlet of the body stability control system.
  • step 3 actually measured pedal stroke-pressure curve 1, step on the brake pedal in situ, and take no less than 10 pressure values within the specified pipeline pressure range for the test, and the interval between the test pressure values equal.
  • the present invention has the following beneficial effects:
  • the prior art is mainly based on theoretical predictions and bench tests. They cannot accurately grasp the gap between the friction lining and the brake disc after a certain mileage of the vehicle, and therefore cannot accurately determine the amount of fluid required for the brake.
  • the present invention can determine the gap values of different brakes, and accurately determine the required fluid volume of the brakes without disassembling the brakes, thereby improving the accuracy of the bench test and solving the problem of vehicle brake pedal feel.
  • the optimization of the bench test method and the optimization of the brake design depth provide great help.
  • Figure 1 is an overall flow chart of a method for testing the required fluid volume of an automobile brake according to the present invention.
  • a method for testing the required fluid volume of automobile brakes is to calculate the difference between the pedal stroke of the brake line before and after the oil line is closed under the same oil pressure to convert the corresponding brake in the brake line. The amount of fluid required under the oil pressure value.
  • the present invention includes the following steps:
  • Step 1 Equipment installation and debugging, used for pedal stroke measurement, master cylinder pressure signal measurement, and control the closing of the four outlet valves of the body stability control system;
  • Step 2 Run the vehicle according to the working conditions to be tested
  • Step 3 Measured pedal stroke-pressure curve 1: Depress the brake pedal in place, select multiple oil pressure values to test, and record the brake pressure P and pedal stroke S1 of each test;
  • Step 4 Measured pedal stroke-pressure curve 2: Close a certain brake pipe outlet valve of the body stability control system control unit, step on the brake pedal, and read the stroke S2 of each oil pressure value in step three;
  • Step 5 Calculation of brake fluid demand:
  • a pedal displacement measuring device is installed at the brake pedal to measure the pedal stroke.
  • a CAN development tool is connected to read the pressure signal of the master cylinder on the CAN bus and control the closing of the four outlet valves of the ESP.
  • the CAN development tool uses Alyzer.
  • the main cylinder pressure is read by an external hydraulic sensor and corresponding equipment at the oil inlet of the body stability control system, and the outlet valve is closed by using a threaded metal plug to block the oil outlet of the body stability control system.
  • step 3 actually measured pedal stroke-pressure curve 1, step on the brake pedal in situ, and take no less than 10 pressure values within the specified pipeline pressure range for the test, and the interval between the test pressure values Try to be equal.
  • Depress the brake pedal on the spot and take 10 points for testing within the specified pipeline pressure range, with the interval between the test points as equal as possible. Record the brake pressure P and pedal stroke S1 for each test.
  • An external hydraulic sensor and corresponding equipment are used to read the pressure of the master cylinder at the oil inlet of the body stability control system, and the outlet valve of the body stability control system is blocked by using a threaded metal plug to close the outlet valve .
  • Depress the brake pedal on the spot and take 10 points for testing within the specified pipeline pressure range, with the interval between the test points as equal as possible. Record the brake pressure P and pedal stroke S1 for each test.
  • Step on the brake pedal on the spot and take 15 points to test within the specified pipeline pressure range, and the interval between the test points should be as equal as possible. Record the brake pressure P and pedal stroke S1 for each test.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

一种汽车制动器所需液量测试方法，通过计算制动管路在关闭油路前与关闭油路后，同一油压下的踏板行程差值，来换算相应制动器在该油压值下的需液量。首先进行设备安装及调试，然后按待测工况运行车辆；原地踩下制动踏板，选取多个油压值进行试验，记录每次试验的制动压力P及踏板行程S1；关闭车身稳定控制系统控制单元的某一制动管路出液阀，踩下制动踏板，读取各油压值的行程S2；通过公式计算制动管路在各油压值下的制动器需液量,能在不拆制动器的情况下，准确判断制动器的所需液量，对于车辆制动踏板感问题解决、台架试验方法优化以及制动器设计优化提供较大帮助。

Description

一种汽车制动器所需液量测试方法 技术领域
本发明涉及一种汽车制动器所需液量测试方法，可用于为制动踏板舒适性优化提供测试依据，属于制动器设计技术领域。
背景技术
制动器所需液量对于制动踏板感舒适性有着重要影响。当出现踏板感问题时，工程师在不拆卸制动器的情况下无法锁定具体是车上四个制动器中的哪一个出现了问题。
目前通常的做法是，将车上的制动器拆下，进行台架试验，但是这种操作改变了摩擦片与制动盘在车辆上的间隙状态，而且台架所需液量试验均是在常温下进行，无法考虑温度对所需液量的影响，因此常常导致工程师无法找到踏板感问题出现的真因。
另外，在台架上测量制动器的需液量需要预设摩擦片与制动盘之间的间隙，通常这个间隙是根据经验设定的定值，但是不同的制动器的间隙是不同的，因此现有技术无法精准体现制动器在车辆上的实际需液量。
专利文献1公开了一种制动器的P-V关系测试方法，是一种在完成实物开发之前预测其P-V关系的分析方法。要义是确定制动器在设定制动压力下的制动间隙δ及制动器刚性变形量△s；确定在设定压力下的原始制动需液量Vy；通过所述原始制动需液量Vy确定理论制动需液量V1；通过所述理论制动需液量V1确定最终制动需液量Vz。可以看出此专利是一种预测制动器P-V关系的理论方法，而非测量制动器在整车实际工况中的所需液。
专利文献2公开了一种汽车制动系统的制动液需液量测试装置，用于测量小流量大压力制动需液量。该装置主要由空腔圆管、直线位移传感器、工字型活塞和金属杆组成，空腔圆管的两端分别与制动硬管和制动软管的接口螺纹连接；在空腔圆管内设置有一工字型活塞；工字型活塞与空腔圆管过渡配合；在 工字型活塞的连接杆上垂直设置有一金属杆；在金属杆的顶端设置有直线位移传感器，且直线位移传感器的滑块与金属杆顶端固定在一起；直线位移传感器与空腔圆管内壁固定连接。该专利是一种测量制动需液量的台架试验方法，而非测量制动器在整车实际工况中的所需液。
专利文献3公开了一种液压制动钳综合性能试验台的耗液量测试装置及测试方法，其要义为通过滚珠丝杆可以把旋转运动转化成直线运动，并且把直线进给量传递给离合器总泵的推杆，测试组件结构简单实用，与减速机相连的伺服电机通过联轴器与滚珠丝杆连接简单可靠。测试加载机构结构简单精度高，并且配有调零装置。耗液量测试装置的固定组件快速准确。耗液量测试装置的固定组件结构简单，定位精确方便。该专利是一种测量制动需液量的台架试验方法，而非测量制动器在整车实际工况中的所需液。
综上，现有技术主要为理论预测及台架试验，皆未能准确把握车辆行驶一段里程后，摩擦片与制动盘之间的间隙，因此无法准确判断制动器所需液量。
发明内容
为了解决现有技术主要为理论预测及台架试验，皆未能准确把握车辆行驶一段里程后，摩擦片与制动盘之间的间隙，因此无法准确判断制动器所需液量的问题，本发明提供一种汽车制动器所需液量测试方法，能在不拆制动器的情况下，准确判断制动器的所需液量。对于车辆制动踏板感问题解决、台架试验方法优化以及制动器设计优化提供较大帮助。
本发明的目的是通过以下技术方案实现的：
一种汽车制动器所需液量测试方法，通过计算制动管路在关闭油路前与关闭油路后，同一油压下的踏板行程差值，来换算相应制动器在该油压值下的需液量。
进一步地，本发明包括以下步骤：
步骤一、设备安装及调试，用于进行踏板行程测量、主缸压力信号测量以及控制车身稳定控制系统四个出液阀的关闭；
步骤二、按待测工况运行车辆；
步骤三、实测踏板行程-压力曲线1：原地踩下制动踏板，选取多个油压值进行试验，记录每次试验的制动压力P及踏板行程S1；
步骤四、实测踏板行程-压力曲线2：关闭车身稳定控制系统控制单元的某一制动管路出液阀，踩下制动踏板，读取步骤三中各油压值的行程S2；
步骤五、制动器需液量计算：
通过公式V＝((S1-S2)/a)*πd 2/4计算步骤四中所述制动管路在各油压值下的制动器需液量。
作为优选的，所述步骤一中，在制动踏板处安装踏板位移测量装置，用于测量踏板行程。
作为优选的，所述步骤一中，连接CAN开发工具，用于读取CAN总线上的主缸压力信号，并控制ESP四个出液阀的关闭。
更为优选的，CAN开发工具采用Alyzer。
作为替代的，主缸压力的读取在车身稳定控制系统进油口处外接液压传感器及相应设备，出液阀的关闭通过使用带螺纹的金属堵头将车身稳定控制系统出油口堵死。
进一步地，所述步骤三实测踏板行程-压力曲线1中，原地踩下制动踏板，在规定的管路压力范围内取不少于10个压力值进行试验，各试验压力值间的间隔相等。
与现有技术相比，本发明具有以下有益效果：
现有技术主要为理论预测及台架试验，皆未能准确把握车辆行驶一段里程后，摩擦片与制动盘之间的间隙，因此无法准确判断制动器所需液量。与现有技术相比，本发明可以确定不同制动器的间隙值，在不拆制动器的情况下，准确判断制动器的所需液量，进而提高台架试验精度，对于车辆制动踏板感问题解决、台架试验方法优化以及制动器设计深度优化提供较大帮助。
附图说明
图1为本发明一种汽车制动器所需液量测试方法整体流程图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构。
如图1所示，一种汽车制动器所需液量测试方法，通过计算制动管路在关闭油路前与关闭油路后，同一油压下的踏板行程差值，来换算相应制动器在该油压值下的需液量。
进一步地，本发明包括以下步骤：
步骤一、设备安装及调试，用于进行踏板行程测量、主缸压力信号测量以及控制车身稳定控制系统四个出液阀的关闭；
步骤二、按待测工况运行车辆；
步骤三、实测踏板行程-压力曲线1：原地踩下制动踏板，选取多个油压值进行试验，记录每次试验的制动压力P及踏板行程S1；
步骤四、实测踏板行程-压力曲线2：关闭车身稳定控制系统控制单元的某一制动管路出液阀，踩下制动踏板，读取步骤三中各油压值的行程S2；
步骤五、制动器需液量计算：
通过公式V＝((S1-S2)/a)*πd 2/4计算步骤四中所述制动管路在各油压值下的制动器需液量。
作为优选的，所述步骤一中，在制动踏板处安装踏板位移测量装置，用于测量踏板行程。
作为优选的，所述步骤一中，连接CAN开发工具，用于读取CAN总线上的主缸压力信号，并控制ESP四个出液阀的关闭。
更为优选的，CAN开发工具采用Alyzer。
作为替代的，主缸压力的读取在车身稳定控制系统进油口处外接液压传感 器及相应设备，出液阀的关闭通过使用带螺纹的金属堵头将车身稳定控制系统出油口堵死。
进一步地，所述步骤三实测踏板行程-压力曲线1中，原地踩下制动踏板，在规定的管路压力范围内取不少于10个压力值进行试验，各试验压力值间的间隔尽量相等。
实施例1
一、设备安装及调试
1.在制动踏板处安装踏板位移测量装置，用于测量踏板行程(踏板行程也可使用其它可达相同目的的设备测量)；
2.连接CAN开发工具Alyzer，用于读取CAN总线上的主缸压力信号，并控制ESP(车身稳定控制系统)四个出液阀的关闭。
二、按待测工况运行车辆：
启动车辆，按需求在特定工况下停车。
三、实测踏板行程-压力曲线1：
原地踩下制动踏板，在规定的管路压力范围内取10个点进行试验，各试验点间的间隔尽量相等。记录每次试验的制动压力P及踏板行程S1。
四、实测踏板行程-压力曲线2：
通过Alyzer关闭ESP控制单元的左前制动管路出液阀，踩下制动踏板，读取前述各压力点的行程S2。
五、制动器需液量计算：
通过公式V＝((S1-S2)/a)*πd 2/4计算各压力点下的左前制动器所需液量。
实施例2
一、设备安装及调试
1.在制动踏板处安装踏板位移测量装置，用于测量踏板行程(踏板行程也可使用其它可达相同目的的设备测量)；
2.在车身稳定控制系统进油口处外接液压传感器及相应设备用于主缸压力的读取，通过使用带螺纹的金属堵头将车身稳定控制系统出油口堵死进行出液 阀的关闭。
二、按待测工况运行车辆：
启动车辆，按需求在特定工况下停车。
三、实测踏板行程-压力曲线1：
原地踩下制动踏板，在规定的管路压力范围内取10个点进行试验，各试验点间的间隔尽量相等。记录每次试验的制动压力P及踏板行程S1。
四、实测踏板行程-压力曲线2：
通过Alyzer关闭ESP控制单元的左前制动管路出液阀，踩下制动踏板，读取前述各压力点的行程S2。
五、制动器需液量计算：
通过公式V＝((S1-S2)/a)*πd 2/4计算各压力点下的左前制动器所需液量。
实施例3
一、设备安装及调试
1.在制动踏板处安装踏板位移测量装置，用于测量踏板行程(踏板行程也可使用其它可达相同目的的设备测量)；
2.连接CAN开发工具Alyzer，用于读取CAN总线上的主缸压力信号，并控制ESP(车身稳定控制系统)四个出液阀的关闭。
二、按待测工况运行车辆：
启动车辆，按需求在特定工况下停车。
三、实测踏板行程-压力曲线1：
原地踩下制动踏板，在规定的管路压力范围内取15个点进行试验，各试验点间的间隔尽量相等。记录每次试验的制动压力P及踏板行程S1。
四、实测踏板行程-压力曲线2：
通过Alyzer关闭ESP控制单元的右前制动管路出液阀，踩下制动踏板，读取前述各压力点的行程S2。
五、制动器需液量计算：
通过公式V＝((S1-S2)/a)*πd 2/4计算各压力点下的右前制动器所需液量。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (8)

  1. 一种汽车制动器所需液量测试方法，其特征在于，通过计算制动管路在关闭油路前与关闭油路后，同一油压下的踏板行程差值，来换算相应制动器在该油压值下的需液量。
  2. 如权利要求1所述的一种汽车制动器所需液量测试方法，其特征在于，包括以下步骤：
    步骤一、设备安装及调试，用于进行踏板行程测量、主缸压力信号测量以及控制车身稳定控制系统四个出液阀的关闭；
    步骤二、按待测工况运行车辆；
    步骤三、实测踏板行程-压力曲线1：原地踩下制动踏板，选取多个油压值进行试验，记录每次试验的制动压力P及踏板行程S1；
    步骤四、实测踏板行程-压力曲线2：关闭车身稳定控制系统控制单元的某一制动管路出液阀，踩下制动踏板，读取步骤三中各油压值的行程S2；
    步骤五、制动器需液量计算：
    通过公式V＝((S1-S2)/a)*πd 2/4计算步骤四中所述制动管路在各油压值下的制动器需液量。
  3. 如权利要求2所述的一种汽车制动器所需液量测试方法，其特征在于，所述步骤一中，在制动踏板处安装踏板位移测量装置，用于测量踏板行程。
  4. 如权利要求2所述的一种汽车制动器所需液量测试方法，其特征在于，所述步骤一中，连接CAN开发工具，用于读取CAN总线上的主缸压力信号，并控制ESP四个出液阀的关闭。
  5. 如权利要求4所述的一种汽车制动器所需液量测试方法，其特征在于，CAN开发工具采用Alyzer。
  6. 如权利要求2所述的一种汽车制动器所需液量测试方法，其特征在于，主缸压力的读取在车身稳定控制系统进油口处外接液压传感器，出液阀的关闭通过使用带螺纹的金属堵头将车身稳定控制系统出油口堵死。
  7. 如权利要求2所述的一种汽车制动器所需液量测试方法，其特征在于，所述步骤三实测踏板行程-压力曲线1中，原地踩下制动踏板，在规定的管路压力 范围内取不少于10个压力值进行试验.
  8. 如权利要求7所述的一种汽车制动器所需液量测试方法，其特征在于，所述选取的各试验压力值间的间隔相等。
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