WO2022063211A1 - 一种车辆的制动系统漏液检测方法和装置 - Google Patents
一种车辆的制动系统漏液检测方法和装置 Download PDFInfo
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- WO2022063211A1 WO2022063211A1 PCT/CN2021/120192 CN2021120192W WO2022063211A1 WO 2022063211 A1 WO2022063211 A1 WO 2022063211A1 CN 2021120192 W CN2021120192 W CN 2021120192W WO 2022063211 A1 WO2022063211 A1 WO 2022063211A1
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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
- 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
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- the present disclosure relates to the technical field of vehicles, and in particular, to a method and device for detecting fluid leakage in a braking system of a vehicle.
- the vehicle generally adopts the hydraulic braking method, that is, the brake fluid is used as the working medium for braking.
- the brake fluid In order to ensure safe braking, the brake fluid cannot leak. If the leakage occurs, the braking will occur due to insufficient working medium. Ineffective or even brake failure, whichever situation is fatal to the safe driving of the vehicle.
- the present disclosure provides a method and device for detecting fluid leakage in a braking system of a vehicle, so as to ensure the safe driving of the vehicle.
- the present disclosure discloses a method for detecting fluid leakage in a braking system of a vehicle, comprising the steps of:
- the described pressing interval based on the pump motor of the braking system of the vehicle, to judge whether the current condition meets the first condition comprising the steps:
- the pressing interval is smaller than the pressing interval threshold, it is determined that the current condition meets the first condition, otherwise, the first condition is not met.
- the master cylinder target pressure value includes a non-braking target pressure value, an emergency braking target pressure value and a parking brake target pressure value.
- the judging whether the current condition meets the second condition based on the pressure change of the accumulator of the braking system includes the steps of:
- the recording of the number of times that the accumulator fails to depressurize within a preset period includes the steps of:
- the pressure value of the accumulator decreases by more than a preset pressure drop threshold within a preset time period, it is determined that the failure to depressurize once;
- a vehicle brake system leakage detection device comprising:
- a first judging module configured to judge whether the current condition meets the first condition based on the pressing interval of the pump motor of the braking system of the vehicle;
- a second judging module configured to judge whether the braking system is in a stable operating condition based on the master cylinder target pressure if the current condition satisfies the first condition
- a third judging module configured to judge whether the current condition complies with the second condition based on the pressure change of the accumulator of the braking system if the braking system is in the stable working condition;
- the determination output module is configured to determine that the brake system has a fluid leakage fault if the current condition meets the second condition, and output fault information.
- the first judgment module includes:
- a pressing recording unit configured to record the pressing interval between two pressings of the pump motor
- an interval judging unit configured to judge whether the pressing interval is less than the pressing interval threshold
- the result determination unit is configured to determine that the current condition complies with the first condition if the pressing interval is smaller than the pressing interval threshold, and otherwise does not meet the first condition.
- the master cylinder target pressure value includes a non-braking target pressure value, an emergency braking target pressure value and a parking brake target pressure value.
- the third judgment module includes:
- a pressure acquisition unit configured to acquire an accumulator pressure value of the accumulator
- a depressurization recording unit configured to record the number of times that the accumulator fails to depressurize in each preset cycle when the pressure value of the accumulator is lower than a preset low-pressure threshold
- the result determination unit is configured to determine that the current condition complies with the second condition if the number of times the fault is depressurized in each preset period exceeds a preset number of times.
- the step-down recording unit is specifically configured as:
- the pressure drop of the accumulator exceeds the preset pressure drop threshold within a preset period of time, it is determined that the fault drop occurs once; the number of times of the fault drop is recorded. .
- the present disclosure provides a method and device for detecting fluid leakage in a braking system of a vehicle, specifically determining whether the current condition meets the first condition based on the pressure interval of the pump motor of the braking system of the vehicle; If the current condition satisfies the first condition, it is determined whether the braking system is in a stable working condition based on the target pressure of the master cylinder; if the braking system is in a stable working condition, whether the current condition is met based on the pressure change of the accumulator of the braking system The second condition is judged; if the current condition complies with the second condition, it is judged that the brake system has a leakage fault, and the fault information is output to the driver. The driver can take corresponding measures in time according to the corresponding fault information, thereby ensuring the safe driving of the vehicle.
- FIG. 1 is a flowchart of a method for detecting fluid leakage in a braking system of a vehicle according to an embodiment of the disclosure
- FIG. 2 is a schematic diagram of a braking system
- FIG. 3 is a block diagram of a vehicle brake system leakage detection device according to an embodiment of the disclosure.
- FIG. 1 is a flowchart of a method for detecting fluid leakage in a braking system of a vehicle according to an embodiment of the disclosure.
- the liquid leakage detection method provided in this embodiment is used to detect whether liquid leakage occurs in the braking system of the vehicle, so that the driver can obtain the corresponding information in time.
- the vehicle in the present disclosure can be understood as any vehicle driven on land by power, such as a car, a train, etc., and the vehicle in the present disclosure can also be understood as a rail vehicle running on a rail in a narrow sense. That is, any mechanical device that relies on hydraulic power to brake.
- the braking system mentioned in the present disclosure is shown in FIG. 2 , the pump motor in the hydraulic unit is used to drive the hydraulic pump to press the accumulator, and the accumulator supplies pressure to the master cylinder through the pipeline, so that the master cylinder is When the corresponding braking signal is received, the brake components of the wheel output pressure to make the wheel brake.
- the method for detecting fluid leakage in the braking system of a vehicle includes the following steps:
- the judgment is made based on the pressing interval of the pump motor of the vehicle's brake system, that is, the pressing interval is regarded as a prerequisite for judging whether the brake system leaks fluid.
- the braking system monitors the accumulator pressure of the accumulator at any time.
- the braking system controls the pump motor to pressurize the accumulator, and records the accumulator at all times.
- the time of each pressing of the energy device By monitoring the time of each pressing, we can obtain the pressing interval between any two adjacent layers of the accumulator. time difference. It was recorded after each suppression interval was monitored.
- each stamping interval is compared with a stamping interval threshold, which can be obtained by monitoring or calculation during actual operation, and this stamping interval threshold is selected as 300 seconds in the present disclosure.
- the comparison here is to compare whether the suppression interval is less than 300 seconds.
- the pressing interval is less than 300 seconds, that is, less than the preselected pressing interval threshold, it is determined that the current condition satisfies the first condition, where the first condition refers to the pressure maintaining condition of the accumulator. If the interval is greater than 300 seconds, that is, it is greater than the pressure interval threshold, which indicates that the brake system is not suspected of leaking fluid at present.
- the selected master cylinder target pressures in the present disclosure are respectively the unbraking target pressure value, the emergency braking target pressure and the parking brake target pressure value.
- the non-braking target pressure value is 0 bar
- the emergency braking target pressure value is 90 bar
- the parking braking target pressure value is 100 bar.
- the target pressure value of the parking brake is selected to be a larger pressure value called the target pressure value of the emergency brake.
- target pressure value That is, according to whether the current target pressure value satisfies the above-mentioned pressure value when not braking, emergency braking or parking braking. If it is satisfied, it is determined that the braking system is in a stable working condition, and if not, it is determined that the braking system is in an unstable working condition.
- the current pressure of the accumulator is obtained at any time, that is, the pressure value of the accumulator is obtained.
- the pressure value of the accumulator is monitored at any time.
- the preset low pressure threshold is selected as 150 bar.
- the preset period here can be selected as 48 seconds. Specifically: in the preset period, if the voltage drop that occurs within a preset time period exceeds the preset voltage drop threshold, it is determined that a fault voltage reduction occurs, that is, abnormal voltage reduction occurs, and it is recorded once if it does not occur. For example, when the pressure drop that occurs within 2 seconds reaches or exceeds 1.5 bar in the preset period, 48 seconds, this pressure drop is recorded as a fault drop occurred.
- the present embodiment provides a method for detecting fluid leakage in a braking system of a vehicle, specifically determining whether the current condition meets the first condition based on the pressure interval of the pump motor of the braking system of the vehicle; if If the current condition satisfies the first condition, it is determined whether the braking system is in a stable working condition based on the master cylinder target pressure; The second condition is judged; if the current condition complies with the second condition, it is judged that the brake system has a leakage fault, and the fault information is output to the driver.
- the driver can take corresponding measures in time according to the corresponding fault information, thereby ensuring the safe driving of the vehicle.
- FIG. 3 is a block diagram of an apparatus for detecting fluid leakage in a braking system of a vehicle according to an embodiment of the disclosure.
- the liquid leakage detection device provided in this embodiment is used to detect whether liquid leakage occurs in the braking system of the vehicle, so that the driver can obtain the corresponding information in time.
- the vehicle in the present disclosure can be understood as any vehicle driven on land by power, such as a car, a train, etc., and the vehicle in the present disclosure can also be understood as a rail vehicle running on a rail in a narrow sense. That is, any mechanical device that relies on hydraulic power to brake.
- the device for detecting fluid leakage in the braking system of the vehicle includes a first judgment module 10 , a second judgment module 20 , a third judgment module 30 and a judgment output module 40 .
- the first judgment module is used for judging whether the current condition satisfies the first condition.
- the judgment is made based on the pressing interval of the pump motor of the vehicle's brake system, that is, the pressing interval is regarded as a prerequisite for judging whether the brake system leaks fluid.
- This module is specific for the recording unit, the interval judging unit and the result judging unit.
- the braking system monitors the accumulator pressure of the accumulator at any time.
- the braking system controls the pump motor to pressurize the accumulator, and records the accumulator at all times.
- the time of each pressing of the energy device By monitoring the time of each pressing, we can obtain the pressing interval between any two adjacent layers of the accumulator. time difference.
- the squeezing recording unit is used to record each squeezing interval after monitoring it.
- the interval judging unit is used to compare each pressing interval with a pressing interval threshold, which can be obtained by monitoring or calculation during actual operation.
- the pressing interval threshold is selected as 300 seconds.
- the comparison here is to compare whether the suppression interval is less than 300 seconds.
- the result determination unit is configured to determine that the current condition satisfies the first condition if the pressing interval is less than 300 seconds, that is, less than the preselected pressing interval threshold, where the first condition refers to the pressure maintaining condition of the accumulator. If the interval is greater than 300 seconds, that is, it is greater than the pressure interval threshold, which indicates that the brake system is not suspected of leaking fluid at present.
- the second judgment module is used for judging whether the target pressure of the master cylinder is in a stable working condition.
- the selected master cylinder target pressures in the present disclosure are respectively the unbraking target pressure value, the emergency braking target pressure and the parking brake target pressure value.
- the non-braking target pressure value is 0 bar
- the emergency braking target pressure value is 90 bar
- the parking braking target pressure value is 100 bar.
- the target pressure value of the parking brake is selected to be a larger pressure value called the target pressure value of the emergency brake.
- target pressure value That is, according to whether the current target pressure value satisfies the above-mentioned pressure value when not braking, emergency braking or parking braking. If it is satisfied, it is determined that the braking system is in a stable working condition, and if not, it is determined that the braking system is in an unstable working condition.
- the third judgment module is configured to judge whether the current condition satisfies the second condition based on the pressure change of the accumulator.
- the module includes a pressure acquisition unit, a pressure reduction recording unit and a result determination unit.
- the pressure acquisition unit is used to acquire the current pressure of the accumulator at any time, that is, to acquire the pressure value of the accumulator.
- the pressure value of the accumulator is monitored at any time. When the pressure value of the accumulator is lower than the preset low pressure threshold, the following steps are performed, and if it is not lower than the preset low pressure threshold, the monitoring is continued.
- the preset low pressure threshold is selected as 150 bar.
- the depressurization recording unit is used to record the number of times that the accumulator fails to depressurize in a preset period when the pressure value of the accumulator is found to be lower than the preset low pressure threshold, and the preset period here can be selected as 48 seconds. Specifically: in the preset period, if the voltage drop that occurs within a preset time period exceeds the preset voltage drop threshold, it is determined that a fault voltage drop occurs, that is, abnormal voltage drop occurs, and it is recorded once if it does not occur. For example, when the pressure drop that occurs within 2 seconds reaches or exceeds 1.5 bar in the preset period, 48 seconds, this pressure drop is recorded as a fault drop occurred.
- the result determination unit is configured to determine that the current condition complies with the preset second condition if the predicted number of occurrences, such as 3 faults and voltage drops, are recorded within the preset period.
- the judging output module is used for judging that a fluid leakage fault occurs in the braking system when the current condition satisfies the second condition.
- the present embodiment provides a vehicle brake system leakage detection device, which specifically determines whether the current condition meets the first condition based on the pressure interval of the pump motor of the vehicle brake system; if If the current condition satisfies the first condition, it is determined whether the braking system is in a stable working condition based on the master cylinder target pressure; The second condition is judged; if the current condition complies with the second condition, it is judged that the brake system has a leakage fault, and the fault information is output to the driver.
- the driver can take corresponding measures in time according to the corresponding fault information, thus ensuring the safe driving of the vehicle.
- embodiments of the embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, CD-ROM, optical storage, and the like.
- Embodiments of the present disclosure are described with reference to flowcharts and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present disclosure. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing terminal equipment to produce a machine that causes the instructions to be executed by the processor of the computer or other programmable data processing terminal equipment Means are created for implementing the functions specified in the flow or flows of the flowcharts and/or the blocks or blocks of the block diagrams.
- These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing terminal equipment to operate in a particular manner, such that the instructions stored in the computer readable memory result in an article of manufacture comprising instruction means, the The instruction means implement the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.
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Abstract
一种车辆的制动系统漏液检测方法和装置。该检测方法具体为基于车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；如果当前条件满足第一条件，则基于主缸目标压力判断制动系统是否处于稳定工况；如果制动系统处于稳定工况，则基于制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；如果当前条件符合第二条件，则判定制动系统发生漏液故障，并向驾驶人员输出故障信息。驾驶人员即可根据相应的故障信息及时采取相应的处置措施，从而保证了车辆的安全行驶。
Description
相关公开的交叉引用
本公开要求于2020年09月25日提交的申请号为202011026171.3，名称为“一种车辆的制动系统漏液检测方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
本公开涉及车辆技术领域，特别是涉及一种车辆的制动系统漏液检测方法和装置。
目前车辆一般采用液力制动方式，即采用制动液作为工作介质进行制动，为了保证安全制动，制动液不能发生泄漏，如果发生泄漏就会因工作介质量不够而导致发生制动效果不良甚至制动失效，无论哪种情况对于车辆的安全行驶来说都是致命的。
因此，有必要对车辆的制动液是否泄漏进行检测，当检测到制动液发生泄漏时及时报警，以使驾驶人员能够做出相应的处置，从而保证车辆的安全行驶。
公开内容
为了解决上述问题，本公开提供了一种车辆的制动系统漏液检测方法和装置，以保证车辆的安全行驶。
有鉴于此，本公开公开了一种车辆的制动系统漏液检测方法，包括步骤：
基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；
如果当前条件满足所述第一条件，则基于所述主缸目标压力判断所述制动系统是否处于稳定工况；
如果所述制动系统处于所述稳定工况，则基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；
如果当前条件符合所述第二条件，判定所述制动系统发生漏液故障，并输出故障信息。
可选的，所述基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符 合第一条件，包括步骤：
记录所述泵电机两次打压之间的所述打压间隔；
判断所述打压间隔是否小于打压间隔阈值；
如果所述打压间隔小于所述打压间隔阈值，则判定当前条件符合所述第一条件，反之则不符合所述第一条件。
可选的，所述主缸目标压力值包括未制动目标压力值、应急制动目标压力值和停车制动目标压力值。
可选的，所述基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断，包括步骤：
获取所述蓄能器的蓄能器压力值；
当所述蓄能器压力值低于预设低压阈值时，记录所述蓄能器在每个预设周期内发生故障降压的次数；
如果在所述每个预设周期内的所述故障降压的次数超过预设次数，则判定当前条件符合所述第二条件。
可选的，所述记录所述蓄能器在预设周期内发生故障降压的次数，包括步骤：
在一个所述预设周期内，如果在一个预设时长内所述蓄能器压力值降低超过预设压降阈值，则判定发生一次所述故障降压；
记录所述故障降压的次数。
还提供了一种车辆的制动系统漏液检测装置，包括：
第一判断模块，别配置为基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；
第二判断模块，被配置为如果当前条件满足所述第一条件，则基于所述主缸目标压力判断所述制动系统是否处于稳定工况；
第三判断模块，被配置为如果所述制动系统处于所述稳定工况，则基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；
判定输出模块，被配置为如果当前条件符合所述第二条件，则判定所述制动系统发生漏液故障，并输出故障信息。
可选的，所述第一判断模块包括：
打压记录单元，被配置为记录所述泵电机两次打压之间的所述打压间隔；
间隔判断单元，被配置为判断所述打压间隔是否小于打压间隔阈值；
结果判定单元，被配置为如果所述打压间隔小于所述打压间隔阈值，则判定当前条件符合所述第一条件，反之则不符合所述第一条件。
可选的，所述主缸目标压力值包括未制动目标压力值、应急制动目标压力值和停车制动目标压力值。
可选的，所述第三判断模块包括：
压力获取单元，被配置为获取所述蓄能器的蓄能器压力值；
降压记录单元，被配置为当所述蓄能器压力值低于预设低压阈值时，记录所述蓄能器在每个预设周期内发生故障降压的次数；
结果判定单元，被配置为如果在所述每个预设周期内的所述故障降压的次数超过预设次数，则判定当前条件符合所述第二条件。
可选的，所述降压记录单元具体被配置为：
在一个所述预设周期内，如果在一个预设时长内所述蓄能器压力值降压超过预设压降阈值，则判定发生一次所述故障降压；记录所述故障降压的次数。
从上述技术方案可以看出，本公开提供了一种车辆的制动系统漏液检测方法和装置，具体为基于车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；如果当前条件满足第一条件，则基于主缸目标压力判断制动系统是否处于稳定工况；如果制动系统处于稳定工况，则基于制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；如果当前条件符合第二条件，则判定制动系统发生漏液故障，并向驾驶人员输出故障信息。驾驶人员即可根据相应的故障信息及时采取相应的处置措施，从而保证了车辆的安全行驶。
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还 可以根据这些附图获得其他的附图。
图1为本公开实施例的一种车辆的制动系统漏液检测方法的流程图；
图2为一种制动系统的示意图；
图3为公开亲实施例的一种车辆的制动系统漏液检测装置的框图。
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
实施例一
图1为本公开实施例的一种车辆的制动系统漏液检测方法的流程图。
本实施例提供的漏液检测方法用于对车辆的制动系统是否发生漏液进行检测，以便驾驶员能够及时获取相应信息。本公开的车辆可以理解为任意依靠动力驱动的陆上行驶的车辆，如汽车、火车等，本公开中的车辆还可以狭义理解为依托轨道行驶的轨道车辆。即任意依靠液力进行制动的机械装置。
本公开中所提及的制动系统如图2所示，液压单元中的泵电机用于驱动液压泵对蓄能器进行打压，蓄能器通过管路对主缸供压，这样主缸在接收到相应的制动信号时对车轮的制动部件输出压力，以使车轮进行制动。
如图1所示，本实施例提供的车辆的制动系统漏液检测方法包括.如下步骤：
S1、判断当前条件是否满足第一条件。
在具体实施时，是基于车辆的制动系统的泵电机的打压间隔进行判断，即将打压间隔作为判断制动系统是否漏液的先决条件。
在实际运行过中，制动系统随时监测蓄能器的蓄能器压力，当蓄能器低于系统设定的压力门限时，制动系统控制泵电机为蓄能器打压，并时刻记录蓄能器每次打压的时间。通过对每次打压的时间的监测，我们即可得到蓄能器任意相邻两层打压之间的打压间隔，所谓的打压间隔，即相邻两层为蓄能器打压的泵电机工作开始时间的时间差。在监 测到每个打压间隔后将其予以记录。
然后，将每个打压间隔与打压间隔阈值予以比较，该打印间隔阈值可以通过实际运行期间的监测或者计算得到，本公开中这个打压间隔阈值选定为300秒。这里的比较即比较该打压间隔是否小于300秒。
最后，如果打压间隔小于300秒，即小于预先选定的打压间隔阈值，则判定当前条件满足第一条件，这里的第一条件是指蓄能器的保压条件。如果大于间隔大于300秒，即大于该打压间隔阈值，此时表明制动系统目前没有漏液嫌疑。
S2、判断主缸目标压力是否处于稳定工况。
本公开中选定的主缸目标压力分别为未制动目标压力值、应急制动目标压力和停车制动目标压力值。在本公开的一个具体实施方式中，未制动目标压力值为0bar，应急制动目标压力值为90bar，停车制动目标压力值的100bar。
对于轨道车辆来说，为了保证其停车时能够稳定制动，避免给上下车人员造成危险，因此其在停车状态下也是需要施加制动力的，且为了避免较长停车时间下因泄压导致制动力降低，因此其停车制动目标压力值选用一个叫应急制动目标压力值较大的压力值。
在该车辆的制动系统满足第一条件时，即打压间隔较小时，判断该主缸目标压力是否处于稳定工况，即能够在相应具体工况下满足上述参数或者根据本原则选定的其他目标压力值。即根据未制动时、应急制动或停车制动时，当前的目标压力值是否满足上述压力值。如果满足则判定制动系统处于稳定工况，如果不满足则判定制动系统处于不稳定工况。
S3、基于蓄能器压力值判断当前条件是否满足第二条件。
即在制动系统满足稳定工况的情况下，对蓄能器的蓄能器压力值进行判断，根据蓄能器压力值的变化规律判断当前条件是否满足第二条件。该具体判断过程如下所述：
首先，随时获取蓄能器的当前压力，即获取蓄能器压力值。并随时对蓄能器压力值进行监测，当蓄能器压力值低于预设低压阈值时，执行下面的步骤，如果不低于该预设低压阈值则继续监控。在本公开的一个具体实施方式中，预设低压阈值选取150bar。
其次，当发现蓄能器压力值低于该预设低压阈值时，记录该蓄能器在一个预设周期内发生故障降压的次数，这里的预设周期可选用48秒。具体来说：在该预设周期内， 如果在一个预设时长内发生的压降超过预设压降阈值，则判定发生一次故障降压，即不正常降压，没发生一次则记录一次。例如，当在该预设周期、48秒内，在2秒内发生的压降达到或超过1.5bar，则将此次压降记录为发生一次故障降压。
最后，如果在该预设周期内记录到发生预测次数、如3次的故障降压，则判定当前条件符合预设的第二条件。
S4、判定制动系统发生漏液故障。
即当当前条件符合预设的第二条件时，判断发生漏液故障，此时将相应的故障信息发送至车辆的显控台，以使驾驶人员能够知道制动系统发生了漏液故障
从上述技术方案可以看出，本实施例提供了一种车辆的制动系统漏液检测方法，具体为基于车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；如果当前条件满足第一条件，则基于主缸目标压力判断制动系统是否处于稳定工况；如果制动系统处于稳定工况，则基于制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；如果当前条件符合第二条件，则判定制动系统发生漏液故障，并向驾驶人员输出故障信息。驾驶人员即可根据相应的故障信息及时采取相应的处置措施，从而保证了车辆的安全行驶。
需要说明的是，对于方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本公开实施例并不受所描述的动作顺序的限制，因为依据本公开实施例，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作并不一定是本公开实施例所必须的。
实施例二
图3为本公开实施例的一种车辆的制动系统漏液检测装置的框图。
本实施例提供的漏液检测装置用于对车辆的制动系统是否发生漏液进行检测，以便驾驶员能够及时获取相应信息。本公开的车辆可以理解为任意依靠动力驱动的陆上行驶的车辆，如汽车、火车等，本公开中的车辆还可以狭义理解为依托轨道行驶的轨道车辆。 即任意依靠液力进行制动的机械装置。
如图3所示，本实施例提供的车辆的制动系统漏液检测装置包括.第一判断模块10、第二判断模块20、第三判断模块30和判定输出模块40。
第一判断模块用于判断当前条件是否满足第一条件。
在具体实施时，是基于车辆的制动系统的泵电机的打压间隔进行判断，即将打压间隔作为判断制动系统是否漏液的先决条件。本模块具体拗口打压记录单元、间隔判断单元和结果判定单元。
在实际运行过中，制动系统随时监测蓄能器的蓄能器压力，当蓄能器低于系统设定的压力门限时，制动系统控制泵电机为蓄能器打压，并时刻记录蓄能器每次打压的时间。通过对每次打压的时间的监测，我们即可得到蓄能器任意相邻两层打压之间的打压间隔，所谓的打压间隔，即相邻两层为蓄能器打压的泵电机工作开始时间的时间差。打压记录单元用于在监测到每个打压间隔后将其予以记录。
间隔判断单元用于将每个打压间隔与打压间隔阈值予以比较，该打印间隔阈值可以通过实际运行期间的监测或者计算得到，本公开中这个打压间隔阈值选定为300秒。这里的比较即比较该打压间隔是否小于300秒。
结果判定单元用于如果打压间隔小于300秒，即小于预先选定的打压间隔阈值，则判定当前条件满足第一条件，这里的第一条件是指蓄能器的保压条件。如果大于间隔大于300秒，即大于该打压间隔阈值，此时表明制动系统目前没有漏液嫌疑。
第二判断模块用于判断主缸目标压力是否处于稳定工况。
本公开中选定的主缸目标压力分别为未制动目标压力值、应急制动目标压力和停车制动目标压力值。在本公开的一个具体实施方式中，未制动目标压力值为0bar，应急制动目标压力值为90bar，停车制动目标压力值的100bar。
对于轨道车辆来说，为了保证其停车时能够稳定制动，避免给上下车人员造成危险，因此其在停车状态下也是需要施加制动力的，且为了避免较长停车时间下因泄压导致制动力降低，因此其停车制动目标压力值选用一个叫应急制动目标压力值较大的压力值。
在该车辆的制动系统满足第一条件时，即打压间隔较小时，判断该主缸目标压力是否处于稳定工况，即能够在相应具体工况下满足上述参数或者根据本原则选定的其他目 标压力值。即根据未制动时、应急制动或停车制动时，当前的目标压力值是否满足上述压力值。如果满足则判定制动系统处于稳定工况，如果不满足则判定制动系统处于不稳定工况。
第三判断模块用于基于蓄能器的压力变化判断当前条件是否满足第二条件。
即在制动系统满足稳定工况的情况下，对蓄能器的蓄能器压力值进行判断，根据蓄能器压力值的变化规律判断当前条件是否满足第二条件。该该模块包括压力获取单元、降压记录单元和结果判定单元。
压力获取单元用于随时获取蓄能器的当前压力，即获取蓄能器压力值。并随时对蓄能器压力值进行监测，当蓄能器压力值低于预设低压阈值时，执行下面的步骤，如果不低于该预设低压阈值则继续监控。在本公开的一个具体实施方式中，预设低压阈值选取150bar。
降压记录单元用于当发现蓄能器压力值低于该预设低压阈值时，记录该蓄能器在一个预设周期内发生故障降压的次数，这里的预设周期可选用48秒。具体来说：在该预设周期内，如果在一个预设时长内发生的压降超过预设压降阈值，则判定发生一次故障降压，即不正常降压，没发生一次则记录一次。例如，当在该预设周期、48秒内，在2秒内发生的压降达到或超过1.5bar，则将此次压降记录为发生一次故障降压。
结果判定单元用于如果在该预设周期内记录到发生预测次数、如3次的故障降压，则判定当前条件符合预设的第二条件。
判定输出模块用于在当前条件满足第二条件时判定制动系统发生漏液故障。
即当当前条件符合预设的第二条件时，判断发生漏液故障，此时将相应的故障信息发送至车辆的显控台，以使驾驶人员能够知道制动系统发生了漏液故障
从上述技术方案可以看出，本实施例提供了一种车辆的制动系统漏液检测装置，具体为基于车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；如果当前条件满足第一条件，则基于主缸目标压力判断制动系统是否处于稳定工况；如果制动系统处于稳定工况，则基于制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；如果当前条件符合第二条件，则判定制动系统发生漏液故障，并向驾驶人员输出故障信息。驾驶人员即可根据相应的故障信息及时采取相应的处置措施，从而保 证了车辆的安全行驶。
对于装置实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。
本领域内的技术人员应明白，本公开实施例的实施例可提供为方法、装置、或计算机程序产品。因此，本公开实施例可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开实施例可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD－ROM、光学存储器等)上实施的计算机程序产品的形式。
本公开实施例是参照根据本公开实施例的方法、终端设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理终端设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理终端设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理终端设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理终端设备上，使得在计算机或其他可编程终端设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程终端设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本公开实施例的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本公开实施例范围的所有变更和修改。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者终端设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者终端设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者终端设备中还存在另外的相同要素。
以上对本公开所提供的技术方案进行了详细介绍，本文中应用了具体个例对本公开的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本公开的方法及其核心思想；同时，对于本领域的一般技术人员，依据本公开的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本公开的限制。
Claims (10)
- 一种车辆的制动系统漏液检测方法，其特征在于，包括步骤：基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；如果当前条件满足所述第一条件，则基于主缸目标压力判断所述制动系统是否处于稳定工况；如果所述制动系统处于所述稳定工况，则基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；如果当前条件符合所述第二条件，判定所述制动系统发生漏液故障，并输出故障信息。
- 如权利要求1所述的制动系统漏液检测方法，其特征在于，所述基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件，包括步骤：记录所述泵电机两次打压之间的所述打压间隔；判断所述打压间隔是否小于打压间隔阈值；如果所述打压间隔小于所述打压间隔阈值，则判定当前条件符合所述第一条件，反之则不符合所述第一条件。
- 如权利要求1所述的制动系统漏液检测方法，其特征在于，所述主缸目标压力值包括未制动目标压力值、应急制动目标压力值和停车制动目标压力值。
- 如权利要求1所述的制动系统漏液检测方法，其特征在于，所述基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断，包括步骤：获取所述蓄能器的蓄能器压力值；当所述蓄能器压力值低于预设低压阈值时，记录所述蓄能器在每个预设周期内发生故障降压的次数；如果在所述每个预设周期内的所述故障降压的次数超过预设次数，则判定当前条件符合所述第二条件。
- 如权利要求4所述的制动系统漏液检测方法，其特征在于，所述记录所述蓄能器在预设周期内发生故障降压的次数，包括步骤：在一个所述预设周期内，如果在一个预设时长内所述蓄能器压力值降低超过预设压降阈值，则判定发生一次所述故障降压；记录所述故障降压的次数。
- 一种车辆的制动系统漏液检测装置，其特征在于，包括：第一判断模块，别配置为基于所述车辆的制动系统的泵电机的打压间隔，判断当前条件是否符合第一条件；第二判断模块，被配置为如果当前条件满足所述第一条件，则基于主缸目标压力判断所述制动系统是否处于稳定工况；第三判断模块，被配置为如果所述制动系统处于所述稳定工况，则基于所述制动系统的蓄能器的压力变化对当前条件是否符合第二条件进行判断；判定输出模块，被配置为如果当前条件符合所述第二条件，则判定所述制动系统发生漏液故障，并输出故障信息。
- 如权利要求6所述的制动系统漏液检测装置，其特征在于，所述第一判断模块包括：打压记录单元，被配置为记录所述泵电机两次打压之间的所述打压间隔；间隔判断单元，被配置为判断所述打压间隔是否小于打压间隔阈值；结果判定单元，被配置为如果所述打压间隔小于所述打压间隔阈值，则判定当前条件符合所述第一条件，反之则不符合所述第一条件。
- 如权利要求6所述的制动系统漏液检测装置，其特征在于，所述主缸目标压力值包括未制动目标压力值、应急制动目标压力值和停车制动目标压力值。
- 如权利要求6所述的制动系统漏液检测装置，其特征在于，所述第三判断模块包括：压力获取单元，被配置为获取所述蓄能器的蓄能器压力值；降压记录单元，被配置为当所述蓄能器压力值低于预设低压阈值时，记录所述蓄能器在每个预设周期内发生故障降压的次数；结果判定单元，被配置为如果在所述每个预设周期内的所述故障降压的次数超过预设次数，则判定当前条件符合所述第二条件。
- 如权利要求9所述的制动系统漏液检测装置，其特征在于，所述降压记录单元具体被配置为：在一个所述预设周期内，如果在一个预设时长内所述蓄能器压力值降压超过预设压降阈值，则判定发生一次所述故障降压；记录所述故障降压的次数。
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