CN104265478A - Method for determining if intake pressure sensor of diesel engine is abnormal and for fault diagnosis - Google Patents
Method for determining if intake pressure sensor of diesel engine is abnormal and for fault diagnosis Download PDFInfo
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Abstract
本发明公开了一种确定增压柴油机进气压力传感器是否异常及故障诊断方法，其中确定增压柴油机进气压力传感器是否异常的方法包括如下步骤：步骤1，在柴油机运行状态下，测量前2秒内进气压力传感器的输出电压的平均值，由柴油机控制器判断该平均值是否处于进气压力传感器的许用电压范围内；步骤2，若平均值超出进气压力传感器的许用电压范围，则柴油机控制器确定进气压力传感器为异常，若进气压力传感器确定为异常，然后根据异常持续的时间来判断传感器是否为故障。该方法可以现实快速诊断和准确定位，实现快速维护。
The invention discloses a method for determining whether the intake pressure sensor of a supercharged diesel engine is abnormal and a fault diagnosis method, wherein the method for determining whether the intake pressure sensor of a supercharged diesel engine is abnormal comprises the following steps: Step 1, under the running state of the diesel engine, measure the first 2 The average value of the output voltage of the intake air pressure sensor within seconds, and the diesel engine controller judges whether the average value is within the allowable voltage range of the intake air pressure sensor; step 2, if the average value exceeds the allowable voltage range of the intake air pressure sensor , the diesel engine controller determines that the intake air pressure sensor is abnormal, and if the intake air pressure sensor is determined to be abnormal, then judges whether the sensor is faulty or not according to the duration of the abnormality. This method can realize rapid diagnosis and accurate positioning, and realize rapid maintenance.
Description
技术领域technical field
本发明涉及柴油机电子控制领域，特别涉及一种确定增压柴油机进气压力传感器是否异常及故障诊断方法。The invention relates to the field of electronic control of diesel engines, in particular to a method for determining whether an air intake pressure sensor of a supercharged diesel engine is abnormal and a fault diagnosis method.
背景技术Background technique
进气压力传感器是柴油机电子控制系统的重要部件，电控系统根据进气压力的大小来计算实际进入气缸的气量，进而修正和限制实际喷油量，所以，进气压力传感器的状态正常与否，对柴油机动力性、经济性和排放都有重要影响。The intake pressure sensor is an important part of the electronic control system of the diesel engine. The electronic control system calculates the actual gas volume entering the cylinder according to the intake pressure, and then corrects and limits the actual fuel injection volume. Therefore, whether the status of the intake pressure sensor is normal or not , has an important impact on the power, economy and emissions of diesel engines.
目前，在柴油机电控系统故障诊断技术中，通过直接测量传感器输出的电压来判断故障。当输出电压超过控制器设定的最大范围时，即判断传感器出现故障。其缺点是用输出电压判断故障不准确，如传感器特性发生改变或是出现零点漂移时，该方法无法检测，易出现漏检。其次，输出电压受电源系统影响，若电源系统不稳定时，该方法易出现误检。At present, in the fault diagnosis technology of the diesel engine electronic control system, the fault is judged by directly measuring the output voltage of the sensor. When the output voltage exceeds the maximum range set by the controller, it is judged that the sensor has failed. Its disadvantage is that it is inaccurate to use the output voltage to judge the fault. For example, when the characteristics of the sensor change or the zero point drift occurs, this method cannot detect and is prone to missed detection. Secondly, the output voltage is affected by the power system. If the power system is unstable, this method is prone to false detection.
公开于该背景技术部分的信息仅仅旨在增加对本发明的总体背景的理解，而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art.
发明内容Contents of the invention
本发明的目的在于提供一种确定增压柴油机进气压力传感器是否异常及故障诊断方法，通过对进气压力传感器运行中对比检测，实现对进气压力传感器的快速诊断和准确定位，增加电控系统的可靠性，实现快速维护。The purpose of the present invention is to provide a method for determining whether the intake pressure sensor of a supercharged diesel engine is abnormal and for fault diagnosis. By comparing and detecting the intake pressure sensor during operation, the rapid diagnosis and accurate positioning of the intake pressure sensor can be realized, and the electronic control system can be increased. System reliability and rapid maintenance.
为实现上述目的，本发明提供了一种确定增压柴油机进气压力传感器是否异常的方法，包括如下步骤：步骤1，在柴油机运行状态下，测量前2秒内进气压力传感器的输出电压的平均值，由柴油机控制器判断该平均值是否处于进气压力传感器的许用电压范围内；步骤2，若平均值超出进气压力传感器的许用电压范围，则柴油机控制器确定进气压力传感器为异常。In order to achieve the above object, the present invention provides a method for determining whether the intake air pressure sensor of a supercharged diesel engine is abnormal, comprising the following steps: Step 1, under the running state of the diesel engine, measure the output voltage of the intake air pressure sensor within the first 2 seconds average value, the diesel engine controller judges whether the average value is within the allowable voltage range of the intake pressure sensor; step 2, if the average value exceeds the allowable voltage range of the intake pressure sensor, the diesel engine controller determines that the intake pressure sensor is abnormal.
优选地，在步骤2中，若平均值处于进气压力传感器的许用电压范围内时，则执行如下步骤：步骤1a，计算前2s内进气压力的均方差，由柴油机控制器判断该均方差是否小于0.15bar；步骤2a，若均方差大于0.15bar，则柴油机控制器确定进气压力传感器为异常。Preferably, in step 2, if the average value is within the allowable voltage range of the intake air pressure sensor, the following steps are performed: Step 1a, calculate the mean square error of the intake air pressure within the previous 2s, and the diesel engine controller judges the mean square error of the intake air pressure Whether the variance is less than 0.15 bar; step 2a, if the mean variance is greater than 0.15 bar, the diesel engine controller determines that the intake air pressure sensor is abnormal.
优选地，在步骤2a中，若均方差小于0.15bar时，则执行如下步骤：步骤1b，在柴油机运行状态下，计算进气压力的估计值，同时采集进气压力传感器的测量值，并由柴油机控制器判断估计值与测量值的相对偏差是否大于30％；步骤2b，若估计值与实际值的相对偏差大于30％，则柴油机控制器确定进气压力传感器为异常。Preferably, in step 2a, if the mean square error is less than 0.15 bar, the following steps are performed: step 1b, in the running state of the diesel engine, calculate the estimated value of the intake air pressure, and collect the measured value of the intake air pressure sensor at the same time, and by The diesel engine controller determines whether the relative deviation between the estimated value and the measured value is greater than 30%; step 2b, if the relative deviation between the estimated value and the actual value is greater than 30%, the diesel engine controller determines that the intake pressure sensor is abnormal.
本发明还提供了一种增压柴油机进气压力传感器的故障诊断方法，若柴油机控制器根据上述方法确定进气压力传感器为异常，则柴油机控制器进行异常持续时间累积；若异常持续时间累积达到第一预定值，则柴油机控制器认定进气压力传感器故障发生。The present invention also provides a fault diagnosis method for the intake air pressure sensor of a supercharged diesel engine. If the diesel engine controller determines that the intake air pressure sensor is abnormal according to the above method, then the diesel engine controller performs abnormal duration accumulation; if the abnormal duration accumulation reaches the first predetermined value, the diesel engine controller determines that the failure of the intake air pressure sensor occurs.
优选地，若柴油机控制器认定进气压力传感器故障发生，则柴油机控制器进行故障消除的持续时间累积；若故障消除的持续时间累积达到第二预定值，则柴油机控制器认定进气压力传感器故障消除。Preferably, if the diesel engine controller determines that the intake air pressure sensor failure occurs, then the diesel engine controller carries out accumulation of the duration of fault elimination; if the accumulation of the duration of fault elimination reaches a second predetermined value, then the diesel engine controller determines that the intake air pressure sensor failure eliminate.
与现有技术相比，本发明具有如下有益效果：通过对进气压力传感器运行中的对比检测，实现对进气压力传感器的快速诊断和准确定位，增加电控系统的可靠性，实现快速维护。Compared with the prior art, the present invention has the following beneficial effects: rapid diagnosis and accurate positioning of the intake air pressure sensor can be realized through comparative detection of the intake air pressure sensor during operation, the reliability of the electronic control system can be increased, and rapid maintenance can be realized .
附图说明Description of drawings
图1是根据本发明的确定增压柴油机进气压力传感器是否异常及故障诊断方法示意图；Fig. 1 is a schematic diagram of determining whether the intake pressure sensor of a supercharged diesel engine is abnormal and a fault diagnosis method according to the present invention;
图2是根据本发明的确定增压柴油机进气压力传感器是否异常的方法中进行硬件自检测和逻辑自检测的原理示意图；Fig. 2 is a principle schematic diagram of hardware self-test and logic self-test in the method for determining whether the intake pressure sensor of a supercharged diesel engine is abnormal according to the present invention;
图3是本发明中涉及到的进气压力传感器的特性曲线图；Fig. 3 is a characteristic curve diagram of the intake pressure sensor involved in the present invention;
图4是根据本发明的确定增压柴油机进气压力传感器是否异常的方法中进行稳定性检测和估计值对比检测的原理示意图；Fig. 4 is a schematic diagram of the principle of stability detection and estimated value comparison detection in the method for determining whether the intake pressure sensor of a supercharged diesel engine is abnormal according to the present invention;
图5是根据本发明的增压柴油机进气压力传感器的故障诊断方法的原理示意图；Fig. 5 is a principle schematic diagram of the fault diagnosis method of the supercharging diesel engine air intake pressure sensor according to the present invention;
图6是在运行中确定增压柴油机进气压力传感器是否异常及故障诊断方法示意图。Fig. 6 is a schematic diagram of determining whether the intake pressure sensor of a supercharged diesel engine is abnormal and a fault diagnosis method during operation.
具体实施方式Detailed ways
下面结合附图，对本发明的具体实施方式进行详细描述，但应当理解本发明的保护范围并不受具体实施方式的限制。The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
除非另有其它明确表示，否则在整个说明书和权利要求书中，术语“包括”或其变换如“包含”或“包括有”等等将被理解为包括所陈述的元件或组成部分，而并未排除其它元件或其它组成部分。Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.
如图1及图6所示，根据本发明具体实施方式的确定增压柴油机进气压力传感器是否异常及故障诊断方法是基于现有传感器的基础上，通过停机自检或运行中对比检测来快速、准确地对增压柴油机进气压力传感器进行故障诊断，无论是对增加电控系统可靠性，还是对提高快速维护性都有着重要的实际意义。具体地，在电控系统上电后，在停机状态下，柴油机控制器根据采集到的进气压力传感器信号，对进气压力传感器进行自检。在柴油机运行中，控制器根据传感器信号进行对比检测。自检和对比检测可判断传感器是否异常，控制器再依据传感器异常持续的时间认定传感器是否发生故障。最后，控制器还可以依据传感器恢复正常的持续时间来认定故障是否已经消除。As shown in Fig. 1 and Fig. 6, according to the specific embodiment of the present invention, the method for determining whether the air intake pressure sensor of a supercharged diesel engine is abnormal and the fault diagnosis method are based on the existing sensor, and are quickly detected by shutting down self-inspection or comparison detection during operation. 1. Accurately diagnose the fault of the intake pressure sensor of the supercharged diesel engine, which has important practical significance for increasing the reliability of the electronic control system and improving the quick maintenance. Specifically, after the electronic control system is powered on, the diesel engine controller performs a self-check on the intake air pressure sensor according to the collected intake air pressure sensor signal in the shutdown state. When the diesel engine is running, the controller performs comparative detection according to the sensor signal. Self-inspection and comparative inspection can determine whether the sensor is abnormal, and the controller determines whether the sensor is faulty according to the duration of the sensor abnormality. Finally, the controller can also determine whether the fault has been eliminated based on the duration of the sensor returning to normal.
如图2所示，柴油机电控系统上电后，停机时，进气压力传感器上电自检共分为硬件自检测和逻辑自检测。As shown in Figure 2, after the diesel engine electronic control system is powered on and shut down, the power-on self-test of the intake pressure sensor is divided into hardware self-test and logic self-test.
首先，进行传感器硬件自检测，即利用传感器采集的电压信号进行判断。具体地，检测传感器输出电压值是否超出许用电压范围，若超出上限电压值的110％或低于下限电压值的90％，则控制器判断传感器出现异常，反之传感器硬件无异常。因为传感器设计完成后，其特性曲线(所测压力与传感器输出电压的关系)必须满足使用范围要求。因此，当传感器输出的电压在特性曲线之外(参见图3)，如超出上限电压值的110％或低于下限电压值的90％，则说明所测压力已不在使用范围之内，不符合传感器设计，因此控制器检测出传感器出现异常。另外，一般传感器加工均有误差，因此上下限并不是一个特定值，会有些许偏差但必须在5％以内，如设计的传感器上限电压为3V，则真实传感器上限电压应在2.85V～3.15V之间。因此检测条件应大于5％，故取上限电压的110％，下限的90％。若传感器输出电压超出10％这个范围，则说明传感器有异常。First, the sensor hardware self-test is carried out, that is, the voltage signal collected by the sensor is used for judgment. Specifically, it detects whether the output voltage value of the sensor exceeds the allowable voltage range. If it exceeds 110% of the upper limit voltage value or is lower than 90% of the lower limit voltage value, the controller judges that the sensor is abnormal, otherwise the sensor hardware is normal. Because after the design of the sensor is completed, its characteristic curve (the relationship between the measured pressure and the output voltage of the sensor) must meet the requirements of the use range. Therefore, when the output voltage of the sensor is outside the characteristic curve (see Figure 3), such as exceeding 110% of the upper limit voltage value or lower than 90% of the lower limit voltage value, it means that the measured pressure is no longer within the use range and does not meet the requirements. The sensor is designed so that the controller detects an abnormality in the sensor. In addition, there are errors in general sensor processing, so the upper and lower limits are not a specific value, there will be a slight deviation but must be within 5%. For example, if the designed sensor upper limit voltage is 3V, the real sensor upper limit voltage should be 2.85V ~ 3.15V between. Therefore, the detection condition should be greater than 5%, so take 110% of the upper limit voltage and 90% of the lower limit. If the sensor output voltage exceeds the range of 10%, it means that the sensor is abnormal.
其次，若传感器通过硬件自检测，再进行逻辑自检测，否则跳过逻辑自检，如图2所示，在逻辑自检测中，首先判断当前进气压力的测量值有无超出环境压力值的最大范围。其中，环境压力是指在柴油机停止运转时所测进气压力，而环境压力与海拔高度相关，在考虑柴油机所有可能使用的地域，进气压力应大于0.04Mpa(对应5000m海拔)，小于0.12Mpa(对应负海拔)，我国发动机使用范围在海拔5000m到-200m的地形范围内，5000m对应0.04MPa的环境压力，-200m对应0.12 MPa，使用中所测环境压力必须在这个范围内，因此超出这个范围是不合理的。如果进气压力不在此范围，即高于0.12MPa或低于0.04MPa时，控制器判断传感器硬件出现异常，反之无异常。当出现异常时，不进行下一步判断。若当前进气压力的测量值没有超出环境压力值最大范围(如图2中间部分所示)，再具体检测当前测量进气压力值与前一次停机时存储的有效环境压力值，如图2右侧部分所示，若两者偏差的绝对值大于0.03MPa，则说明本次上电时与前一次正常停机时，车辆所处海拔相差3000m以上，不符合使用常理。我国境内不存在垂直落差在3000m，且迅速就能爬到山顶(中途不停车)的地形。采用此种判断方法是由于海拔逐渐变化过程中，所以前后两次停机时的进气压力是缓变的，若存在突变则说明进气压力异常。因此，偏差大时柴油机控制器判断传感器硬件出现异常，反之传感器硬件无异常。Secondly, if the sensor passes the hardware self-test, then perform logical self-test, otherwise skip the logical self-test, as shown in Figure 2, in the logical self-test, first judge whether the measured value of the current intake pressure exceeds the ambient pressure value maximum range. Among them, the ambient pressure refers to the intake air pressure measured when the diesel engine stops running, and the ambient pressure is related to the altitude. Considering all possible areas where the diesel engine can be used, the intake air pressure should be greater than 0.04Mpa (corresponding to an altitude of 5000m) and less than 0.12Mpa (corresponding to negative altitude), the range of engine use in my country is within the terrain range of 5000m to -200m above sea level, 5000m corresponds to an ambient pressure of 0.04MPa, and -200m corresponds to 0.12 MPa. The ambient pressure measured during use must be within this range, so beyond this The scope is unreasonable. If the intake pressure is not in this range, that is, when it is higher than 0.12MPa or lower than 0.04MPa, the controller judges that the sensor hardware is abnormal, otherwise there is no abnormality. When an exception occurs, no further judgment is made. If the measured value of the current intake pressure does not exceed the maximum range of the ambient pressure value (as shown in the middle part of Figure 2), then specifically detect the current measured intake pressure value and the effective ambient pressure value stored at the previous shutdown, as shown in the right of Figure 2 As shown in the side part, if the absolute value of the deviation between the two is greater than 0.03MPa, it means that the altitude difference between the current power-on and the previous normal shutdown is more than 3000m, which is not in line with common sense. There is no terrain in my country where the vertical drop is 3000m and you can climb to the top of the mountain quickly (without stopping halfway). This judgment method is used because the altitude changes gradually, so the intake pressure changes slowly during the two shutdowns. If there is a sudden change, it indicates that the intake pressure is abnormal. Therefore, when the deviation is large, the diesel engine controller judges that the sensor hardware is abnormal, otherwise the sensor hardware is normal.
如图4所示，在柴油机运转后，控制器根据进气压力传感器信号进行对比检测，包括：对传感器所输出电压值的稳定性检测，以及进气压力测量值与柴油机控制器计算出的估计值对比检测。As shown in Figure 4, after the diesel engine is running, the controller performs comparative detection according to the signal of the intake pressure sensor, including: the stability detection of the output voltage value of the sensor, and the estimation calculated by the intake pressure measurement value and the diesel engine controller Value comparison test.
首先，进行进气压力传感器稳定性检测。控制器将2s内采集到的传感器电压值(2s内共有8次采集，分别为u1,u2…u8)，遵循先入先出的原则存放在其内存中。随后对8次采集的电压平均，见公式1，判断电压平均值u是否在传感器许用范围内，若平均值超过传感器许用范围，则表示运行状态下传感器电压过低(断路、与地短路)或过高(与电源短路)，则控制器判断运行中传感器硬件出现异常。若正常则进入下一步检测，否则不进入下一步均方差检测。First, check the stability of the intake pressure sensor. The controller stores the sensor voltage values collected within 2s (a total of 8 collections within 2s, namely u 1 , u 2 ... u 8 ) in its memory according to the first-in-first-out principle. Then average the voltage collected for 8 times, see formula 1, judge whether the average voltage u is within the allowable range of the sensor, if the average value exceeds the allowable range of the sensor, it means that the sensor voltage is too low in the running state (open circuit, short circuit to ground ) or too high (short circuit with the power supply), the controller judges that the sensor hardware is abnormal during operation. If it is normal, it will enter the next step of detection, otherwise it will not enter the next step of mean square error detection.
其次，控制器将上一步计算出的电压平均值依据传感器特性换算成进气压力，并存储在控制器内存中。连续记录2s内计算出的8个进气压力值(分别为x1,x2…x8)，对8个进气压力值求解均方差δ，计算公式见公式2。控制判断均方差δ是否小于0.15bar，若不满足条件，传感器出现异常，不再进行估计值对比检测。Secondly, the controller converts the average voltage calculated in the previous step into the intake pressure according to the characteristics of the sensor, and stores it in the memory of the controller. Continuously record the 8 intake pressure values calculated within 2s (respectively x 1 , x 2 ... x 8 ), and calculate the mean square error δ for the 8 intake pressure values. See formula 2 for the calculation formula. The control judges whether the mean square error δ is less than 0.15bar. If the condition is not met, the sensor is abnormal, and the estimated value comparison test is no longer performed.
其中，控制器每250ms采集一次，2s共采集8次，这8个测量值通过上述公式2计算可得到均方差。若运行中传感器出现虚接故障，即传感器测量值时而最大(或最小)，时而正常，此时测量值剧烈跳变。当传感器正常时，测量值缓变，均方差在0.05以内。以前真实试验中出现过虚接故障，根据故障数据处理得到均方差在0.15bar以上，故取0.15bar。所以，0.15bar是由试验数据获得。Among them, the controller collects once every 250ms, and collects 8 times in 2s. These 8 measured values can be calculated by the above formula 2 to obtain the mean square error. If the sensor has a virtual connection fault during operation, that is, the measured value of the sensor is sometimes the maximum (or minimum) and sometimes normal, and the measured value jumps sharply at this time. When the sensor is normal, the measured value changes slowly, and the mean square error is within 0.05. There have been virtual connection faults in previous real tests. According to the fault data processing, the mean square error is above 0.15 bar, so 0.15 bar is taken. Therefore, 0.15bar is obtained from experimental data.
最后，对比进气压力传感器估计值(控制器根据其它数据计算出的进气压力值)和测量值(由传感器实际测量出来的进气压力值)。其中，进气压力传感器估计值计算包括如下几步：Finally, compare the estimated value of the intake pressure sensor (the intake pressure value calculated by the controller based on other data) and the measured value (the intake pressure value actually measured by the sensor). Among them, the calculation of the estimated value of the intake air pressure sensor includes the following steps:
1)柴油机控制器根据转速和循环喷油量计算进气压力的基本估计值p′im，计算方法如公式3所示。控制器中已存储基本进气压力估计值p′im与转速n和循环油量Q的特性图，控制器通过查表函数获得p′im。1) The diesel engine controller calculates the basic estimated value p′ im of the intake air pressure according to the rotational speed and the cycle fuel injection quantity, and the calculation method is shown in formula 3. The controller has stored the characteristic map of the basic intake pressure estimated value p′ im and the rotational speed n and the circulating oil quantity Q, and the controller obtains p′ im through a look-up table function.
p′im＝f(n,Q) (3) p'im = f(n,Q) (3)
2)计算修正系数ε，该修正系数用于不同工况下，进气管内压力随时间变化的修正。计算修正系数ε计算公式如公式4所示。其中系数a通过公式5获得。系数a与转速n和循环油量Q的特性图，控制器通过查表函数获得a。2) Calculating the correction coefficient ε, which is used to correct the pressure change in the intake pipe with time under different working conditions. The formula for calculating the correction coefficient ε is shown in formula 4. Among them, the coefficient a is obtained by formula 5. The characteristic diagram of the coefficient a, the speed n and the circulating oil quantity Q, the controller obtains a through the look-up table function.
ε＝e-at (4)ε＝e -at (4)
a＝f(n,Q) (5)a＝f(n,Q) (5)
3)计算进气压力传感器估计值 3) Calculate the estimated value of the intake pressure sensor
4)计算估计值与测量值偏差α，计算公式如公式7所示。4) Calculate the estimated value Deviation α from the measured value, the calculation formula is shown in formula 7.
当估计值与测量值pim的偏差α大于30％时认定传感器出现异常，反之传感器硬件无异常。需要说明的是，估计值在线计算中，由于控制器计算能力不够，因此与实际测量值存在误差，一般在25％左右。故取30％，防止因计算误差导致故障误诊。When the estimated value When the deviation α from the measured value p im is greater than 30%, it is determined that the sensor is abnormal, otherwise the sensor hardware is normal. It should be noted that in the online calculation of the estimated value, due to the insufficient computing power of the controller, there is an error with the actual measured value, which is generally about 25%. Therefore, take 30% to prevent misdiagnosis of faults caused by calculation errors.
如图5所示，上述进气压力传感器的自检和对比检测仅判断出传感器有无异常，还需通过基于连续时间的故障认定方法判断传感器有无故障。即当异常出现的持续时间超过第一预定值时，认定故障发生。当传感器故障已经发生，则控制器开始判断传感器有无恢复正常，若异常状态消失，正常状态持续时间超过第二预定值时，认定故障已经消除。其中，上述第一预定值和第二预定值具体可以设置为500，因为，一般的，控制系统的计时时钟为4ms，只要在2s内，异常一直出现且不中断的话，柴油机控制器认定故障发生，同理，异常状态消失，恢复正常持续的时间达到2s时，柴油机控制器认定故障已经消除。具体如下：As shown in Fig. 5, the self-test and comparative detection of the above-mentioned intake air pressure sensor only judge whether the sensor is abnormal, and it is necessary to judge whether the sensor is faulty or not through the fault identification method based on continuous time. That is, when the duration of abnormal occurrence exceeds the first predetermined value, it is determined that a fault has occurred. When the sensor fault has occurred, the controller starts to judge whether the sensor has returned to normal. If the abnormal state disappears and the duration of the normal state exceeds the second predetermined value, the fault is determined to have been eliminated. Among them, the above-mentioned first predetermined value and second predetermined value can be specifically set to 500, because, generally, the timing clock of the control system is 4ms, as long as the abnormality occurs continuously without interruption within 2s, the diesel engine controller will determine that a fault has occurred , in the same way, when the abnormal state disappears and the duration of returning to normal reaches 2s, the diesel engine controller determines that the fault has been eliminated. details as follows:
1)当进气压力传感器未曾出现过故障，则进行进气压力传感器故障判断；若进气压力传感器已经认定出现故障，则进行进气压力传感器故障解除判断。1) When the intake pressure sensor has never failed, the intake pressure sensor failure judgment is performed; if the intake pressure sensor has been determined to be faulty, the intake pressure sensor failure determination is performed.
2)当进气压力传感器未曾出现过故障，进气压力传感器也未出现过异常，此时说明进气压力传感器处于正常工作状态，因此异常计数值清零，进气压力传感器无故障。2) When the intake pressure sensor has never failed and the intake pressure sensor has no abnormality, it means that the intake pressure sensor is in normal working condition, so the abnormal count value is cleared to zero, and the intake pressure sensor is not faulty.
3)当进气压力传感器未曾出现过故障，但进气压力传感器出现异常，此时说明进气压力传感器有问题但不能认定故障发生，因此增加异常计数，通过异常持续的时间(异常计数说明故障持续的时间)判断故障是否真实发生。若运行过程中，异常计数累积达到第一预定值时，则控制器认定故障发生。此时，故障恢复计数值要清零，以备进气压力传感器恢复判断时使用。若运行过程中，异常计数未达到第一预定值，则不改变进气压力传感器状态，即进气压力传感器被视为正常状态。3) When the intake pressure sensor has never failed, but the intake pressure sensor is abnormal, it means that there is a problem with the intake pressure sensor but it cannot be determined that the fault has occurred, so increase the abnormal count, and pass the abnormal duration time (the abnormal count indicates the fault duration) to determine whether the fault actually occurred. If the accumulation of abnormal counts reaches the first predetermined value during operation, the controller determines that a fault has occurred. At this time, the fault recovery count value should be cleared to be used when the intake pressure sensor recovers to judge. If the abnormal count does not reach the first predetermined value during operation, the state of the intake pressure sensor is not changed, that is, the intake pressure sensor is regarded as a normal state.
4)当进气压力传感器已经出现故障，但进气压力传感器检测时未见异常，此时说明进气压力传感器异常消失但不能认定故障已经解除，因此增加故障恢复计数，通过异常消失持续的时间(故障恢复计数说明故障消除持续的时间)判断故障是否真正消除。若运行过程中，故障恢复计数累积达到第二预定值时，则控制器认定故障消除。此时，异常计数值要清零，以备进气压力传感器故障判断时使用。若运行过程中，故障恢复计数未达到第二预定值，则不改变进气压力传感器状态，即进气压力传感器被视为故障状态。4) When the intake pressure sensor has failed, but there is no abnormality in the detection of the intake pressure sensor, it means that the intake pressure sensor has disappeared abnormally, but it cannot be determined that the fault has been resolved, so increase the fault recovery count and pass the duration of the abnormal disappearance (Fault recovery count shows the duration of fault elimination) to judge whether the fault is really eliminated. If the accumulation of the fault recovery count reaches the second predetermined value during the operation, the controller determines that the fault has been eliminated. At this time, the abnormal count value should be cleared to be used in case of failure judgment of the intake air pressure sensor. If the failure recovery count does not reach the second predetermined value during operation, the state of the intake pressure sensor is not changed, that is, the intake pressure sensor is regarded as a failure state.
5)当进气压力传感器已经出现故障，同时进气压力传感器检测也出现异常，此时说明进气压力传感器仍然处于故障状态。因此故障恢复计数值清零，控制器认为进气压力传感器始终处于故障状态。5) When the intake pressure sensor has failed and the detection of the intake pressure sensor is also abnormal, it means that the intake pressure sensor is still in a fault state. Therefore, the fault recovery count value is cleared, and the controller thinks that the intake pressure sensor is always in a fault state.
前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。这些描述并非想将本发明限定为所公开的精确形式，并且很显然，根据上述教导，可以进行很多改变和变化。对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用，从而使得本领域的技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。本发明的范围意在由权利要求书及其等同形式所限定。The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling others skilled in the art to make and use various exemplary embodiments of the invention, as well as various Choose and change. It is intended that the scope of the invention be defined by the claims and their equivalents.
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