CN106762986B - A kind of detection method of double-clutch speed changer hydraulic system filter failure - Google Patents
A kind of detection method of double-clutch speed changer hydraulic system filter failure Download PDFInfo
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Abstract
本发明公开了一种双离合变速器液压系统过滤器失效的检测方法，包括步骤为：车辆启动步骤；变速器油温大于设定值判断步骤；挡位在挡数量检测步骤，仅有一个挡位在挡；设定时间内换挡请求判断步骤；非工作离合器充油步骤；压力差计算步骤；过滤器故障判断步骤及过滤器失效判定步骤。本发明在不改变机械结构及加装外部传感器的情况下，实时检测过滤器过滤能力的方法，当过滤器失效时，能及时识别并发出信号，避免对变速器液压系统造成进一步污染。同时，该方法是利用原本液压系统中的传感器，不需要外加传感器，节省了硬件的设计变更和生产成本。另外，还能根据不同变速器液压系统特性的不同，对关键参数进行标定，通用性强。
The invention discloses a method for detecting the failure of a filter in a hydraulic system of a dual-clutch transmission, which comprises the following steps: a step of starting the vehicle; a step of judging that the transmission oil temperature is greater than a set value; shifting request judging step within a set time; non-working clutch oil filling step; pressure difference calculation step; filter failure judging step and filter failure judging step. The present invention detects the filtration capacity of the filter in real time without changing the mechanical structure and installing an external sensor. When the filter fails, it can identify and send a signal in time to avoid further pollution to the hydraulic system of the transmission. At the same time, the method utilizes the sensors in the original hydraulic system without adding additional sensors, which saves hardware design changes and production costs. In addition, key parameters can be calibrated according to the characteristics of different transmission hydraulic systems, which is highly versatile.
Description
技术领域technical field
本发明涉及自动变速器液压系统，特别是一种双离合变速器液压系统过滤器失效的检测方法。The invention relates to a hydraulic system of an automatic transmission, in particular to a detection method for a filter failure of a hydraulic system of a dual-clutch transmission.
背景技术Background technique
双离合变速器（DCT）是在传统单离合变速器的基础上增加了一个离合器，在换挡过程中通过两个离合器的配合工作，完成挡位切换。与传统的单离合变速器相比，解决了换挡动力中断的问题。由于DCT的成本比自动变速器（AT）以及无级变速器（CVT）低很多，并且国内轴齿的加工制造技术相对成熟，传动效率高，工作可靠，因此国内对DCT的应用越来越多。The dual-clutch transmission (DCT) adds a clutch to the traditional single-clutch transmission. During the shifting process, the gears are switched through the cooperation of the two clutches. Compared with the traditional single-clutch transmission, it solves the problem of interruption of shifting power. Since the cost of DCT is much lower than that of automatic transmission (AT) and continuously variable transmission (CVT), and the processing and manufacturing technology of domestic shaft teeth is relatively mature, the transmission efficiency is high, and the work is reliable, so the domestic application of DCT is increasing.
湿式双离合变速器的离合器动作是通过液压系统控制完成的，液压系统的清洁度是通过油路中的过滤器来保障的，如果过滤器因为杂质堆积导致失效，液压油中的杂质没有经过过滤进入液压控制系统，将会造成液压控制系统的失效，最终导致变速器故障。The clutch action of the wet dual-clutch transmission is controlled by the hydraulic system. The cleanliness of the hydraulic system is guaranteed by the filter in the oil circuit. If the filter fails due to the accumulation of impurities, the impurities in the hydraulic oil will not enter after filtering. The hydraulic control system will cause the failure of the hydraulic control system, which will eventually lead to transmission failure.
一般的双离合变速器过滤器的更换里程都是通过整车试验得到的，但这种方法不能解决在非正常工况造成的过滤器提前失效情况。The replacement mileage of the general dual-clutch transmission filter is obtained through the whole vehicle test, but this method cannot solve the premature failure of the filter caused by abnormal working conditions.
发明内容Contents of the invention
本发明要解决的技术问题是针对上述现有技术的不足，而提供一种双离合变速器液压系统过滤器失效的检测方法，该双离合变速器液压系统过滤器失效的检测方法能在变速器使用过程中，能自动检测液压系统中高压油路过滤器的状态，能及时识别因非正常工况所造成的过滤器提前失效情况。The technical problem to be solved by the present invention is to provide a detection method for the filter failure of the hydraulic system of the dual-clutch transmission in view of the above-mentioned deficiencies in the prior art. , It can automatically detect the state of the high-pressure oil circuit filter in the hydraulic system, and can timely identify the premature failure of the filter caused by abnormal working conditions.
为解决上述技术问题，本发明采用的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种双离合变速器液压系统过滤器失效的检测方法，包括如下步骤。A method for detecting filter failure of a hydraulic system of a dual-clutch transmission includes the following steps.
步骤1，车辆启动：离合器压力传感器实时采集对应离合器的工作腔压力，并将采集的工作腔压力值反馈给自动变速器控制单元TCU；自动变速器控制单元TCU能自动记录两个离合器的实际压力值与命令压力值。Step 1, start the vehicle: the clutch pressure sensor collects the working chamber pressure of the corresponding clutch in real time, and feeds back the collected working chamber pressure value to the automatic transmission control unit TCU; the automatic transmission control unit TCU can automatically record the actual pressure values of the two clutches and Command pressure value.
步骤2，变速器油温判断：对变速器油温进行实时检测，并将检测的变速器油温值与设定值T进行比较判定。Step 2, judging the transmission oil temperature: real-time detection of the transmission oil temperature, and comparing the detected transmission oil temperature with the set value T for judgment.
步骤3，挡位在挡数量检测：当步骤2检测的变速器油温值大于设定值T时，对挡位在挡数量及预挂挡进行检测。Step 3, detection of the number of gears in gear: when the transmission oil temperature detected in step 2 is greater than the set value T, the number of gears in gear and the pre-engagement gear are detected.
步骤4，设定时间内换挡请求判断：当步骤3检测后确认只有一个挡位在挡且无预挂挡后，自动变速器控制单元TCU判断设定时间t1内是否有换挡请求，其中t1>3s。Step 4, shift request judgment within the set time: when only one gear is in gear and no pre-engagement is confirmed after the detection in step 3, the automatic transmission control unit TCU judges whether there is a shift request within the set time t1, where t1 >3s.
步骤5，非工作离合器充油：当步骤4判断结果为设定时间t1内没有换挡请求时，对非工作离合器进行充油，充油持续时间为t2，且t2<t1。Step 5, non-working clutch oil filling: when the judgment result of step 4 is that there is no shift request within the set time t1, oil filling is performed on the non-working clutch, and the oil filling duration is t2, and t2<t1.
步骤6：压力差计算：压力差计算包括如下步骤。Step 6: Pressure difference calculation: The pressure difference calculation includes the following steps.
步骤61，充油前压力差计算：非工作离合器充油前，工作离合器的工作腔压力的实际采集值为P1，此时，工作离合器的命令压力与实际压力的差值计算为△P11。Step 61, calculation of pressure difference before oil filling: before oil filling of the non-working clutch, the actual collected value of the working chamber pressure of the working clutch is P1, at this time, the difference between the command pressure and the actual pressure of the working clutch is calculated as ΔP11.
步骤62，充油过程中最大压力差计算：非工作离合器充油过程中，工作离合器的工作腔压力所采集到的最小值为P2，此时，工作离合器的命令压力与实际压力的最大差值计算为△P12。Step 62, calculation of the maximum pressure difference during the oil filling process: during the oil filling process of the non-working clutch, the minimum value collected from the working chamber pressure of the working clutch is P2, at this time, the maximum difference between the command pressure and the actual pressure of the working clutch Calculated as ΔP12.
步骤63，充油前后最大压差计算：充油前后，工作离合器的压力变化最大差值记为△P13，则△P13=△P12-△P11。Step 63, calculation of maximum pressure difference before and after oil filling: before and after oil filling, the maximum difference in pressure change of the working clutch is recorded as △P13, then △P13=△P12-△P11.
步骤7，过滤器故障判断：将步骤63计算的△P13与设定的压降边界条件P3进行比较判断；当△P13>P3，且△P12大于0时，则判定为过滤器故障，记录1次过滤器故障。Step 7, filter failure judgment: compare and judge △P13 calculated in step 63 with the set pressure drop boundary condition P3; when △P13>P3, and △P12 is greater than 0, it is judged as filter failure, record 1 Secondary filter failure.
步骤8，过滤器失效判定：将步骤1-步骤7连续循环N次，N≥3，若每次过滤器故障判断均为故障时，则判断过滤器失效。Step 8, filter failure determination: continuously cycle steps 1 to 7 N times, N≥3, if each filter failure is determined to be a failure, it is determined that the filter is invalid.
所述步骤2中，变速器油温的设定值T为20℃。In the step 2, the set value T of the transmission oil temperature is 20°C.
所述步骤4中，换挡请求的设定时间t1为10s。In the step 4, the set time t1 of the shift request is 10s.
所述步骤7中，设定的压降边界条件P3=0.6bar。In the step 7, the set pressure drop boundary condition P3=0.6 bar.
所述步骤8中，将步骤1-步骤7连续循环5次，当5次过滤器故障判断均为故障时，则判断过滤器失效。In the step 8, step 1-step 7 are continuously cycled 5 times, and when all 5 filter fault judgments are faulty, it is judged that the filter is invalid.
本发明采用上述方法后，具有如下有益效果：After the present invention adopts above-mentioned method, have following beneficial effect:
1.在不改变机械结构及加装外部传感器的情况下，实时检测过滤器过滤能力的方法，当过滤器失效时，能及时识别并发出信号，避免对变速器液压系统造成进一步污染。同时，该方法是利用原本液压系统中的传感器，不需要外加传感器，节省了硬件的设计变更和生产成本。1. Without changing the mechanical structure and installing external sensors, the method of real-time detection of filter filtration capacity, when the filter fails, can identify and send a signal in time to avoid further pollution to the transmission hydraulic system. At the same time, the method utilizes the sensors in the original hydraulic system without adding additional sensors, which saves hardware design changes and production costs.
2.能根据不同变速器液压系统特性的不同，对关键参数进行标定，通用性强。具体方法为：上述步骤1至8中，油温设定值T，换挡请求时间t1，非工作离合器充油压力P4，充油时间t2，工作离合器压力变化最大差值P13均为标定量。在使用该方法过程中可以根据变速器油粘温特性，离合器分离弹簧压力，离合器油腔容积，过滤器压降损失等进行标定，可以满足不同的双离合变速器液压系统对过滤器失效的判断。2. According to the different characteristics of the transmission hydraulic system, the key parameters can be calibrated, and the versatility is strong. The specific method is: in the above steps 1 to 8, the oil temperature setting value T, the shift request time t1, the non-working clutch oil filling pressure P4, the oil filling time t2, and the maximum difference of the working clutch pressure change P13 are all calibration values. In the process of using this method, the calibration can be carried out according to the viscosity-temperature characteristics of the transmission oil, the pressure of the clutch release spring, the volume of the clutch oil chamber, and the pressure drop loss of the filter.
附图说明Description of drawings
图1显示了现有技术中双离合变速器液压系统的压力控制示意图。Fig. 1 shows a schematic diagram of pressure control of a hydraulic system of a dual-clutch transmission in the prior art.
图2显示了本发明双离合变速器液压系统过滤器失效的检测方法中的压力差示意图。Fig. 2 shows a schematic diagram of the pressure difference in the method for detecting the filter failure of the hydraulic system of the dual-clutch transmission according to the present invention.
图3显示了本发明双离合变速器液压系统过滤器失效的检测方法中的流程图。Fig. 3 shows a flow chart of the detection method for filter failure of the hydraulic system of the dual-clutch transmission of the present invention.
具体实施方式Detailed ways
下面结合附图和具体较佳实施方式对本发明作进一步详细的说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.
如图1所示，现有技术中的双离合器压力控制系统包括变速器液压系统主油路、过滤器、双离合器压力调节阀和两个离合器压力传感器。As shown in FIG. 1 , a dual clutch pressure control system in the prior art includes a transmission hydraulic system main oil circuit, a filter, a dual clutch pressure regulating valve and two clutch pressure sensors.
变速器液压系统主油路中的液压油经过过滤器过滤后，传递到两个离合器压力调节阀入口，离合器压力传感器位于离合器压力调节阀与离合器之间，实时测量对应离合器的实际工作腔压力。The hydraulic oil in the main oil circuit of the transmission hydraulic system is filtered by the filter, and then transmitted to the inlets of the two clutch pressure regulating valves. The clutch pressure sensor is located between the clutch pressure regulating valve and the clutch, and measures the actual working chamber pressure of the corresponding clutch in real time.
如图3所示，一种双离合变速器液压系统过滤器失效的检测方法，包括如下步骤。As shown in FIG. 3 , a method for detecting filter failure in a hydraulic system of a dual-clutch transmission includes the following steps.
步骤1，车辆启动：离合器压力传感器实时采集对应离合器的工作腔压力，并将采集的工作腔压力值反馈给自动变速器控制单元TCU；自动变速器控制单元TCU能自动记录两个离合器的实际压力值与命令压力值。Step 1, start the vehicle: the clutch pressure sensor collects the working chamber pressure of the corresponding clutch in real time, and feeds back the collected working chamber pressure value to the automatic transmission control unit TCU; the automatic transmission control unit TCU can automatically record the actual pressure values of the two clutches and Command pressure value.
步骤2，变速器油温判断：采用油温传感器对变速器油温进行实时检测，并将检测的变速器油温值与设定值T进行比较判定。Step 2, judging the transmission oil temperature: using an oil temperature sensor to detect the transmission oil temperature in real time, and comparing the detected transmission oil temperature with the set value T for judgment.
这里，变速器油温的设定值T优选为20℃。变速器油温的设定值T不能太低，因为低油温下，变速器油粘度大，流动性差，过滤器前后压降大，会对判断结果造成干扰。Here, the set value T of the transmission oil temperature is preferably 20°C. The setting value T of the transmission oil temperature should not be too low, because at low oil temperature, the transmission oil has high viscosity, poor fluidity, and large pressure drop before and after the filter, which will interfere with the judgment result.
步骤3，挡位在挡数量检测：当步骤2检测的变速器油温值大于设定值T时，也即大于20℃时，对挡位在挡数量及预挂挡进行检测。Step 3, detection of the number of gears in gear: when the transmission oil temperature detected in step 2 is greater than the set value T, that is, greater than 20°C, the number of gears in gear and the pre-engagement gear are detected.
在挡数量及预挂挡的优选检测方式为：自动变速器控制单元TCU根据换挡拨叉位置对挡位在挡数量及预挂挡进行检测。The optimal detection method for the number of gears in gear and the gear in advance is as follows: the automatic transmission control unit TCU detects the number of gears in gear and the gear in advance according to the position of the shift fork.
步骤4，设定时间内换挡请求判断：当步骤3检测后确认只有一个挡位在挡且无预挂挡后，自动变速器控制单元TCU判断设定时间t1内是否有换挡请求，其中t1>3s，优选为10s，从而保证非工作离合器有足够的充油时间。Step 4, shift request judgment within the set time: when only one gear is in gear and no pre-engagement is confirmed after the detection in step 3, the automatic transmission control unit TCU judges whether there is a shift request within the set time t1, where t1 >3s, preferably 10s, so as to ensure sufficient oil filling time for non-working clutches.
设定时间t1内是否有换挡请求的判断依据可以为变速器手柄位置、油门踏板开度或变速器输出轴转速加速度值等中的一种。The basis for judging whether there is a shift request within the set time t1 can be one of the position of the transmission handle, the opening of the accelerator pedal, or the rotational speed acceleration value of the transmission output shaft.
假设，车辆启动后，变速器油温值大于20℃，自动变速器控制单元TCU检测到1挡处于工作状态，偶数轴上没有预挂挡。此时，自动变速器控制单元TCU判断根据当前输出轴转速变换率预挂2挡的等待时间大于10s，因此，过滤器失效检测方法进入激活状态。Suppose, after the vehicle is started, the transmission oil temperature is greater than 20°C, the automatic transmission control unit TCU detects that the 1st gear is in the working state, and there is no pre-engagement gear on the even-numbered shaft. At this time, the automatic transmission control unit TCU judges that the waiting time for pre-engaging the second gear according to the current output shaft speed conversion rate is greater than 10s, so the filter failure detection method enters the active state.
步骤5，非工作离合器充油：当步骤4判断结果为设定时间t1内没有换挡请求时，对非工作离合器进行充油，充油持续时间为t2，且t2<t1。Step 5, non-working clutch oil filling: when the judgment result of step 4 is that there is no shift request within the set time t1, oil filling is performed on the non-working clutch, and the oil filling duration is t2, and t2<t1.
本步骤中，如图2所示，充油命令压力为P4，充油命令压力达到P4的时间应小于100ms，然后进行充油，充油持续时间为t2，且优选为0.5s<t2<t1。In this step, as shown in Figure 2, the oil filling command pressure is P4, and the time for the oil filling command pressure to reach P4 should be less than 100ms, and then the oil filling is performed, and the oil filling duration is t2, and preferably 0.5s<t2<t1 .
其中充油命令压力P4应大于离合器分离弹簧的弹力，其中，t2>0.5s，使充油持续时间能保证离合器油腔完全充油；而t2<t1，则是保证非工作离合器充油过程中没有换挡请求。The oil filling command pressure P4 should be greater than the elastic force of the clutch release spring. Among them, t2>0.5s, so that the oil filling duration can ensure that the clutch oil chamber is completely filled with oil; while t2<t1, it is to ensure that the non-working clutch oil filling process There is no shift request.
步骤6：压力差计算：如图2所示，压力差计算包括如下步骤。Step 6: Pressure difference calculation: As shown in Figure 2, the pressure difference calculation includes the following steps.
步骤61，充油前压力差计算：非工作离合器充油前，工作离合器的工作腔压力的实际采集值为P1，此时，工作离合器的命令压力与实际压力的差值计算为△P11。Step 61, calculation of pressure difference before oil filling: before oil filling of the non-working clutch, the actual collected value of the working chamber pressure of the working clutch is P1, at this time, the difference between the command pressure and the actual pressure of the working clutch is calculated as ΔP11.
假设，此时，奇数轴离合器命令压力与实际压力差值为△P11=0.2bar。Assume, at this time, the difference between the odd-numbered shaft clutch command pressure and the actual pressure is ΔP 11 =0.2 bar.
步骤62，充油过程中最大压力差计算：非工作离合器充油过程中，工作离合器的工作腔压力所采集到的最小值为P2，此时，工作离合器的命令压力与实际压力的最大差值计算为△P12。Step 62, calculation of the maximum pressure difference during the oil filling process: during the oil filling process of the non-working clutch, the minimum value collected from the working chamber pressure of the working clutch is P2, at this time, the maximum difference between the command pressure and the actual pressure of the working clutch Calculated as ΔP12.
假设偶数轴离合器命令压力从非工作状态P4=0bar，10ms内变为P4=7bar，并持续3秒。此过程中记录奇数轴离合器命令压力与实际压力差值，最大差值△P12=1.0bar。Assume that the even-numbered shaft clutch command pressure changes from non-working state P4=0bar to P4=7bar within 10ms and lasts for 3 seconds. During this process, record the difference between the command pressure of the odd-numbered shaft clutch and the actual pressure, and the maximum difference is △P 12 =1.0bar.
步骤63，充油前后最大压差计算：充油前后，工作离合器的压力变化最大差值记为△P13，则△P13=△P12-△P11。Step 63, calculation of maximum pressure difference before and after oil filling: before and after oil filling, the maximum difference in pressure change of the working clutch is recorded as △P13, then △P13=△P12-△P11.
步骤7，过滤器故障判断：将步骤63计算的△P13与设定的压降边界条件P3进行比较判断；当△P13>P3，且△P12大于0时，则判定为过滤器故障，记录1次过滤器故障。Step 7, filter failure judgment: compare and judge △P13 calculated in step 63 with the set pressure drop boundary condition P3; when △P13>P3, and △P12 is greater than 0, it is judged as filter failure, record 1 Secondary filter failure.
设定的压降边界条件P3=0.6bar，此过程中奇数轴离合器压力差值△P13=△P12-△P11=0.8bar，大于设定的压降失效边界条件，记录此次过滤器失效检测为故障。The set pressure drop boundary condition P3=0.6bar, during this process, the odd shaft clutch pressure difference △P 13 =△P 12 -△P 11 =0.8bar, which is greater than the set pressure drop failure boundary condition, record this filtering Device failure is detected as a failure.
步骤8，过滤器失效判定：将步骤1-步骤7连续循环N次，N≥3，优选为5次。若每次过滤器故障判断均为故障时，则判断过滤器失效。Step 8, filter failure determination: continuously cycle steps 1-7 for N times, N≥3, preferably 5 times. If each filter fault judgment is a fault, it is judged that the filter is invalid.
以上详细描述了本发明的优选实施方式，但是，本发明并不限于上述实施方式中的具体细节，在本发明的技术构思范围内，可以对本发明的技术方案进行多种等同变换，这些等同变换均属于本发明的保护范围。The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be carried out to the technical solutions of the present invention. These equivalent transformations All belong to the protection scope of the present invention.
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