CN115217624B - Crankcase ventilation pipeline falling diagnosis method and device, vehicle and storage medium - Google Patents
Crankcase ventilation pipeline falling diagnosis method and device, vehicle and storage medium Download PDFInfo
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- CN115217624B CN115217624B CN202110462571.7A CN202110462571A CN115217624B CN 115217624 B CN115217624 B CN 115217624B CN 202110462571 A CN202110462571 A CN 202110462571A CN 115217624 B CN115217624 B CN 115217624B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating or supervising devices
- F02B77/088—Safety, indicating or supervising devices relating to tightness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention belongs to the technical field of vehicles, and relates to a crankcase ventilation pipeline falling-off diagnosis method, a crankcase ventilation pipeline falling-off diagnosis device, a vehicle and a computer readable storage medium. The method for diagnosing the falling off of the crankcase ventilation pipeline comprises the following steps: acquiring the current working condition of the vehicle; when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value; performing a relative pressure amplitude process to obtain a relative pressure amplitude maximum value; comparing all relative pressure amplitude maxima within a drive cycle with diagnostic criteria; and diagnosing according to the comparison result, and outputting a diagnosis result. Therefore, the invention can greatly reduce the probability of false alarm of diagnosis, has high robustness, brings guiding significance for the pipeline drop diagnosis of the installation pressure sensor, and reduces the time and human resources of calibration work.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a crankcase ventilation pipeline falling-off diagnosis method, a crankcase ventilation pipeline falling-off diagnosis device, a vehicle and a computer readable storage medium.
Background
During operation of the engine, unburned gas mixture in the cylinder may blow-by into the crankcase through the clearance between the piston and the cylinder liner. The function of a crankcase ventilation (PCV) system is to reintroduce unburned mixture into the cylinder for combustion. However, as the PCV valve is connected with the pipeline between the air inlet pipe after air filtration in a clamping manner by two clamps, the risk that the clamp loosens the pipeline and falls off exists, and the unburned mixer enters the atmosphere to cause the evaporation emission to exceed the standard. The prior art generally adopts an energy value method to diagnose the faults of the pipeline falling and formulate a fault management mechanism: recording measured pressure p in crankcase ventilation pipe 1 And p is taken 1 Converting the energy value into an energy value and accumulating the energy value; at the same time, calculating from the current engine speed and engine loadModel pressure p in crankcase ventilation duct 2 And p is taken 2 And converting the energy value into an energy value and accumulating the energy value. Calculation of p 1 And p 2 The deviation between the accumulated values dppcv, was calculated as follows:wherein, enegy (p) 1 ) Is the energy value of the measured pressure; enegy (p) 2 ) Is the energy value of the model pressure. When the high load ventilation pipe is disconnected, the enegy (p 1 )≈0，enegy(p 2 ) Unchanged, dppcv is approximately equal to 1; when the high load ventilation pipe is connected normally, enegy (p 1 )≈enegy(p 2 )，dppcv≈0。
However, the energy value method has two disadvantages: 1. the existing diagnosis scheme is used for simultaneously diagnosing falling faults at two ends of a high-load ventilation pipeline, and because the energy ratio dppc calculated by falling near the end of an air inlet pipe is larger (about 0.99), the energy ratio calculated by falling near the end of a PCV valve is smaller (about 0.8), the fault threshold value is set to be smaller than 0.8 in order to avoid missing the fault, and the risk of false alarm of the fault is increased. 2. The existing diagnosis scheme adopts the actual pressure of a crankcase ventilation pipe and the ratio of model pressure marked according to a marked vehicle to judge, the actual pressure is less than 1Kpa in partial diagnosis working conditions, is greatly influenced by vehicle differences and PCV pipeline hardware differences, the coverage of the model pressure on the vehicle differences is insufficient, and when the absolute value of the actual measured pressure is smaller than the absolute value of the model pressure, the dppcv is close to 1, so that the false alarm fault risk is increased. How to solve the defect that the current diagnosis scheme has insufficient coverage on the vehicle difference and is easy to misreport faults, so as to solve the problem to be solved urgently.
In view of the above problems, those skilled in the art have sought solutions.
The foregoing description is provided for general background information and does not necessarily constitute prior art.
Disclosure of Invention
The invention solves the technical problem of providing a crankcase ventilation pipeline falling off diagnosis method, a crankcase ventilation pipeline falling off diagnosis device, a vehicle and a computer readable storage medium, which can distinguish whether the pipeline falls off or not according to pressure fluctuation in the crankcase ventilation pipeline so as to meet the diagnosis purpose. Therefore, compared with an energy value method, the method does not need to calibrate the model pressure of the crankcase ventilation system under different engine working conditions according to a test vehicle, reduces the influence of vehicle difference on calibration data, and distinguishes fault and fault-free states according to the pressure amplitude after the PCV pressure sensor actual measurement pressure processing. The false alarm probability is extremely low, and the robustness is high. The method has guiding significance for the pipeline drop diagnosis of the installation pressure sensor, and reduces the time and human resources of calibration work while greatly reducing the false alarm rate.
The invention solves the technical problems by adopting the following technical scheme:
the invention provides a method for diagnosing falling off of a crankcase ventilation pipeline, which comprises the following steps: acquiring the current working condition of the vehicle; when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value; performing a relative pressure amplitude process to obtain a relative pressure amplitude maximum value; comparing all relative pressure amplitude maxima within a drive cycle with diagnostic criteria; and diagnosing according to the comparison result, and outputting a diagnosis result.
Further, the step of obtaining the current working condition of the vehicle includes: acquiring current temperature information, wherein the current temperature information comprises an ambient temperature, a current engine coolant temperature and a delay time; acquiring current engine working condition information, wherein the engine working condition information comprises an engine air inlet flow value, an engine air inlet flow change value, an engine rotating speed and a supercharging pressure; and acquiring the current working information of the pressure sensor.
Further, the aforementioned diagnostic conditions include: when the ambient temperature is higher than a preset temperature threshold, and the delay time reaches a first time threshold; or when the ambient temperature is lower than a preset temperature threshold, the temperature of the engine coolant reaches a corresponding coolant temperature threshold, and the corresponding delay time reaches a second time threshold; the engine intake air flow value is within a flow threshold range; the variation value of the air inlet flow of the engine is in the variation threshold range; the engine speed is within a preset speed range; the boost pressure is greater than the boost threshold; the working information of the pressure sensor accords with the normal working condition.
Further, when the current working condition meets the diagnostic condition, the step of obtaining the diagnostic information includes: when the current working condition meets the diagnosis condition, acquiring a plurality of pressure values according to a preset frequency; calculating a pressure sample difference value of two adjacent pressure values; judging whether the pressure sample difference value is larger than 0: if yes, assigning a new pressure value of the two pressure values to the pressure wave peak value; if not, assigning a new pressure value in the two pressure values to the pressure trough value; and calculating the difference between the current pressure wave peak value and the current pressure trough value after each assignment to obtain corresponding relative pressure amplitude, and storing the relative pressure amplitude.
Further, the step of performing the relative pressure amplitude processing to obtain the maximum value of the relative pressure amplitude includes: when the current working condition does not meet the diagnosis condition, the timer is controlled to stop timing; when the current working condition meets the diagnosis condition, controlling a timer to start timing; judging whether the accumulated time counted by the timer reaches a preset duration or not; if yes, all the relative pressure amplitudes in the accumulated time counted by the timer are obtained to obtain the maximum value of the relative pressure amplitudes, and the timer is reset.
Further, in the step of comparing all the maximum values of the relative pressure amplitudes within one driving cycle with the diagnostic criteria, the diagnostic criteria include a failure threshold and a repair threshold: the step of comparing with the diagnostic criteria comprises: if a relative pressure amplitude maximum value is smaller than the fault threshold value, the fault counter counts up by 1; if there is a relative pressure amplitude maximum greater than the repair threshold, the no fault counter counts up by 1.
Further, the step of diagnosing according to the comparison result and outputting the diagnosis result includes: when the sum of the fault counter and the fault counter meets a counting threshold value, comparing the counting numerical values of the fault counter and the fault counter; outputting a drop fault warning when the fault counter value is greater than the no fault counter; and outputting repair fault prompt information or no fault prompt information when the fault counter value is smaller than the no fault counter value.
The invention also provides a crankcase ventilation pipeline falling diagnosis device which is characterized by comprising a processor and a memory: the processor is configured to execute a computer program stored in the memory to perform the crankcase ventilation circuit fallout diagnostic method steps as described above.
The invention also provides a vehicle comprising the crankcase ventilation pipeline falling-off diagnosis device.
The invention also provides a computer readable storage medium storing a computer program which when executed by a processor performs the steps of the crankcase ventilation line fall-off diagnostic method as described hereinbefore.
The invention also provides a crankcase ventilation line drop diagnosis method, a crankcase ventilation line drop diagnosis device, a vehicle and a computer readable storage medium. The method for diagnosing the falling off of the crankcase ventilation pipeline comprises the following steps: acquiring the current working condition of the vehicle; when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value; performing a relative pressure amplitude process to obtain a relative pressure amplitude maximum value; comparing all relative pressure amplitude maxima within a drive cycle with diagnostic criteria; and diagnosing according to the comparison result, and outputting a diagnosis result. Therefore, the invention can distinguish whether the pipeline falls off or not according to the pressure fluctuation in the crankcase ventilation pipe so as to meet the diagnosis purpose. Compared with the prior art, the false alarm rate is greatly reduced, and the robustness is improved. The method has guiding significance for the pipeline drop diagnosis of the installation pressure sensor, reduces the time and human resources of calibration work while greatly reducing the false alarm rate, reduces the operation of users, increases the convenience of the users, and improves the use experience of the users.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a method for diagnosing a drop of a crankcase ventilation pipeline according to a first embodiment of the invention;
FIG. 2 is a schematic and schematic illustration of a PCV system configuration;
FIG. 3a is a plot of the test results of the amplitude method according to the first embodiment of the present invention;
FIG. 3b is a chart showing the false alarm fault risk 3 sigma statistics of the amplitude method according to the first embodiment of the present invention;
FIG. 4a is a plot of energy value method test results;
FIG. 4b is a 3 sigma statistical plot of the false positive failure risk for the energy value method;
FIG. 5 is a flowchart of a method for diagnosing a drop of a crankcase ventilation pipeline according to a first embodiment of the invention;
fig. 6 is a schematic structural diagram of a crankcase ventilation pipeline falling-off diagnosis device according to a second embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the described embodiments are merely some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
First embodiment
FIG. 1 is a flow chart of a method for diagnosing a crankcase ventilation conduit loss according to a first embodiment of the invention; FIG. 2 is a schematic and schematic illustration of a PCV system configuration; FIGS. 3 a-3 b are graphs showing experimental results of an amplitude method according to a first embodiment of the present invention; fig. 4a to 4b are graphs showing experimental results of the energy value method according to the first embodiment of the present invention. For a clear description of the method for diagnosing the falling off of the ventilation pipeline of the crankcase according to the first embodiment of the invention, please refer to fig. 1-5.
During operation of the engine, unburned gas mixture in the cylinder may blow-by into the crankcase through the clearance between the piston and the cylinder liner. The function of a crankcase ventilation (PCV) system is to reintroduce unburned mixture into the cylinder for combustion. A schematic of the PCV system is shown in FIG. 2. The PCV valve 2 is connected with the air inlet pipe 7 through the crankcase ventilation pipes 3, the crankcase ventilation pipes 3 are two, and the two ends are connected in a clamping mode. In the middle-high load working condition, no negative pressure exists in the air inlet manifold 4, and the negative pressure exists in the air inlet pipe 7 after air filtration at the moment, blow-by gas in the crankcase can be sucked into the air inlet pipe 7 through the crankcase ventilation pipe 3, so the ventilation pipe is also called a high-load ventilation pipe. The pressure sensor 6 is installed on the high-load ventilation pipe through the pressure sensor 5 seat, and can monitor whether the high-load ventilation pipe falls off or not through the pressure condition in the pipe. Therefore, the invention designs a device for diagnosing, controlling and processing faults of the falling-off of the crankcase ventilation pipeline based on the pressure fluctuation condition in the pipeline. The method for diagnosing the falling of the crankcase ventilation pipeline based on the actually measured pressure fluctuation of the pressure sensor is provided, so that the OBD function of the crankcase ventilation pipeline is finally realized.
In an embodiment, the crankcase ventilation line drop diagnosis method may be applied to a crankcase ventilation line drop diagnosis device, specifically, the device may be a functional module of a vehicle-mounted terminal, and may be a diagnosis device separately provided in a PCV system by acquiring vehicle information for diagnosis, and the specific setting and application scenario is not limited by technology. Still further, a first embodiment of the present invention provides a crankcase ventilation circuit fallout diagnosis method including the steps of:
step S1: the current working condition of the vehicle is obtained.
In one embodiment, in step S1: the step of obtaining the current working condition of the vehicle comprises the following steps: acquiring current temperature information, wherein the current temperature information comprises an ambient temperature, a current engine coolant temperature and a delay time; acquiring current engine working condition information, wherein the engine working condition information comprises an engine air inlet flow value, an engine air inlet flow change value, an engine rotating speed and a supercharging pressure; and acquiring the current working information of the pressure sensor.
In one embodiment, all the above information for obtaining the current working condition can be broadly divided into three types of information: current temperature information, engine operating condition information, and pressure sensor operating information. Specifically, regarding the present temperature information, since the lower the ambient temperature and/or the lower the engine coolant temperature, the risk of icing exists for the PCV pressure sensor 6, affecting the accuracy of the obtained pressure value and thus affecting the determination of the diagnostic result. It is thus necessary to determine that the pressure sensor 6 is not at risk of icing, i.e. to obtain the ambient temperature engine coolant temperature and the delay time. For the engine working condition, the distinction between failure and non-failure is more obvious in the supercharging and stabilizing working condition, and the engine rotation speed interval, the engine air inlet flow interval and the engine air inlet flow gradient interval which are needed to be calibrated and enter diagnosis under the engine supercharging working condition are needed. There is a need to correspondingly acquire the engine intake air flow value, the engine intake air flow variation value, the engine rotational speed, and the boost pressure. Finally, the pressure value collected by the pressure sensor working information, namely the affirmative pressure sensor 6, is accurate and effective, so that the validity of the diagnosis result is ensured.
In one embodiment, the diagnostic conditions described above include: when the ambient temperature is higher than a preset temperature threshold, and the delay time reaches a first time threshold; or when the ambient temperature is lower than a preset temperature threshold, the temperature of the engine coolant reaches a corresponding coolant temperature threshold, and the corresponding delay time reaches a second time threshold; the engine intake air flow value is within a flow threshold range; the variation value of the air inlet flow of the engine is in the variation threshold range; the engine speed is within a preset speed range; the boost pressure is greater than the boost threshold; the working information of the pressure sensor accords with the normal working condition.
In an embodiment, the present temperature information is that the pressure sensor 6 is ensured not to have a risk of icing, so when the ambient temperature is lower than the preset temperature threshold value for the risk of icing, in this case, the temperature of the engine coolant is required to reach a certain coolant temperature threshold value, and when the corresponding delay time exceeds the second time threshold value, the diagnosis operation is performed again, so as to eliminate the influence of the temperature influence on the diagnosis result. It is understood that the temperature is a variable value in real life, so there is a certain correspondence between the ambient temperature, the coolant temperature and the delay time, and reference is made to tables 1 and 2.
TABLE 1 ambient temperature vs. engine coolant temperature
| Ambient temperature (. Degree. C.) | -30 | -9.8 | -6.8 | 0 | 5.3 | 9.8 |
| Temperature of coolant (. Degree. C.) | 81.8 | 80.3 | 69.8 | 69.8 | 69.8 | 50.3 |
TABLE 2 ambient temperature versus delay time
| Ambient temperature (. Degree. C.) | -30 | -9.8 | -6.8 | 0 | 5.3 | 9.8 |
| Delay time(s) | 6000 | 4500 | 1500 | 200 | 900 | 300 |
Meanwhile, it can be seen from the table that the highest ambient temperature in the table is 9.8 ℃, that is, the preferred choice for the preset temperature threshold is 9.8 ℃ in the present embodiment, that is, when the ambient temperature is higher than 9.8 ℃, the risk of icing of the pressure sensor 6 is considered to be absent, so that the cooling liquid temperature is not needed to be considered any more, and only the delay time is needed to meet the preferred corresponding 300s in the table, so that diagnosis can be started. When the ambient temperature is lower than 9.8 ℃, the influence of the temperature of the cooling liquid needs to be considered, and whether the corresponding delay time is met or not needs to be considered, for example, when the ambient temperature is near 0 ℃, the engine cooling liquid is required to reach 69.8 ℃ and then delay for 1200s to enter the diagnosis, so that the influence of icing on the diagnosis is reduced. Wherein, although the table has written ambient temperature that can be below-30 ℃, this is for extreme cases, preferably the ambient temperature is at least not below-10 ℃.
In one embodiment, for the embodiment of obtaining engine operating condition information, the engine operating condition information specifically includes an engine intake air flow value, an engine intake air flow variation value, an engine speed, and a boost pressure. As the distinction between fault and no fault is more obvious in the supercharging and stable working conditions, the corresponding engine working condition information meets the diagnosis conditions including that the engine intake air flow value is in the flow threshold range; the variation value of the air inlet flow of the engine is in the variation threshold range; the engine speed is within a preset speed range; the boost pressure is greater than the boost threshold. Further, in the present embodiment, the flow threshold range for the engine intake air flow value is preferably an intake air flow greater than 110kg/h and less than 190kg/h; the range of the variation threshold value of the variation of the air inlet flow is preferably more than-20 kg/h and less than 30kg/h; the preferred preset speed range for the engine speed may be speeds greater than 1800rpm, less than 2900rpm; the boost threshold of the boost pressure may particularly preferably be required to be greater than 1200hpa.
In one embodiment, the pressure sensor operating information may be, for example, whether the operating voltage of the pressure sensor 6 is within an operating voltage range. It will be appreciated that since a failure of the PCV sensor circuit may result in an erroneous pressure measurement, it is necessary to detect a failure of the PCV pressure sensor 6 and then to suppress the crankcase ventilation line from falling off, i.e. there is no associated failure suppression for the pressure sensor 6, in order to be sure that the pressure sensor 6 is in a normal operating state.
Step S2: when the current working condition meets the diagnosis condition, the pressure value in the crankcase ventilation pipe is obtained, and the obtained relative pressure amplitude is corresponding to the pressure value.
In one embodiment, in step S2: when the current working condition meets the diagnosis condition, the step of obtaining the diagnosis information comprises the following steps: when the current working condition meets the diagnosis condition, acquiring a plurality of pressure values according to a preset frequency; calculating a pressure sample difference value of two adjacent pressure values; judging whether the pressure sample difference value is larger than 0: if yes, assigning a new pressure value of the two pressure values to the pressure wave peak value; if not, assigning a new pressure value in the two pressure values to the pressure trough value; and calculating the difference between the current pressure wave peak value and the current pressure trough value after each assignment to obtain corresponding relative pressure amplitude, and storing the relative pressure amplitude.
In one embodiment, the preset frequency is preferably 10ms, that is, the PCV pressure sensor 6 reads the pressure value ppcv in the crankcase ventilation pipe 3 at a sampling frequency of 10 ms. The pressure sample difference dppcv between two adjacent new and old pressure values is calculated, wherein the new pressure value is ppcv_new and the old pressure value is ppcv_old, i.e. dppcv=ppcv_new-ppcv_old. Judging whether the pressure sample difference value dppcv is larger than 0: if dppcv > 0, assigning a new pressure value ppcv_new to the pressure wave peak ppcvp; if dppcv is less than or equal to 0, the new pressure value ppcv_new is assigned to the pressure trough value ppcvv. The difference between the current pressure wave peak ppcvp and the current pressure valley value ppcvv is calculated after each assignment to obtain the corresponding relative pressure amplitude ppcvamp tmp_w, that is: ppcvomptmp_w=ppcvp-ppcvv, and saves the relative pressure amplitude ppcvomptmp_w for subsequent reading. Specifically, a simple example is provided that 5 pressure value ppcv samples are obtained in total from t=1 to t=5 at a preset frequency: 3. 4, 5, 2 and 1. Since the calculation is required for both the old and new pressure values, the calculation is started from t=2, and at this time ppcv_new 2=4 and ppcv_old 2=3, the pressure sample difference dppcv2=1 at t=2 can be obtained. Because dppcv2 > 0, a new pressure value ppcv_new2 at t=2 is assigned to a pressure trough value ppcvv2=4 at t=2. Similarly, when t=3 is available, ppcvv3=5, since the pressure wave peak ppcvp does not exist yet at this time, the relative pressure amplitude ppcvamp tmp_w is not calculated. Whereas at t=4, the pressure trough value ppcvv4=ppcvjnew 4=2 is calculated, and the peak value ppcvp3=5 at the current pressure wave peak value t=3 is subtracted to obtain the relative pressure amplitude ppcvamp tmp_w4=3, and this value is stored. At t=5, the same applies to the pressure trough value ppcvv5=1. The difference between the adjacent pressure peak ppcvp and the pressure trough ppcvv at this time is calculated, wherein the pressure trough value ppcvv5 at t=5 is updated compared to ppcvv4 at t=4, so that the current relative pressure amplitude ppcvamp tmp_w5 at t=5 is actually obtained, and the current relative pressure amplitude ppcvamp tmp_w5=4 needs to be calculated by using the current pressure wave peak ppcvv3 and the current pressure trough value ppcvv 5. Wherein two relative pressure amplitudes are obtained during the five samplings, and all the relative pressure amplitudes need to be stored. Specifically, the corresponding values of the time t, the pressure value ppcv, the pressure wave peak value ppcvp, the pressure trough value ppcvv, and the like in the case exemplified in the present embodiment can be seen in table 3.
Sample and corresponding calculation results listed in Table 3
In one embodiment, it is noted that the whole step S2 is performed to obtain and store the relative pressure amplitude ppcvamp tmp_w. The subsequent diagnosis is also made for the relative pressure amplitude ppcvamp tmp_w, in which the initial phase of step S2 for obtaining the relative pressure amplitude ppcvamp tmp_w is performed when the current operating condition meets the diagnostic conditions, due to the problems related to the periodic extraction. That is, the relative pressure amplitude ppcvomptmp_w may be calculated and stored in the present embodiment if and only if the current operating condition satisfies the corresponding condition; however, since the pressure value ppcv may be obtained by the pressure sensor 6, the pressure value ppcv may be obtained and the relative pressure amplitude ppcvomptmp_w may be calculated and obtained, and the relative pressure amplitude ppcvomptmp_w may be stored when the current operating condition satisfies the diagnostic condition. It will be appreciated that the above explanation of the technical process of when to obtain the pressure value ppcv and calculating the stored relative pressure amplitude ppcvamp tmp_w is not limited as long as a record of the relative pressure amplitude ppcvamp tmp_w can be obtained during a significant period of time.
Step S3: the relative pressure amplitude processing is performed to obtain a relative pressure amplitude maximum value.
In one embodiment, in step S3: the step of performing the relative pressure amplitude processing to obtain a maximum value of the relative pressure amplitude includes: when the current working condition does not meet the diagnosis condition, the timer is controlled to stop timing; when the current working condition meets the diagnosis condition, controlling a timer to start timing; judging whether the accumulated time counted by the timer reaches a preset duration or not; if yes, all the relative pressure amplitudes in the accumulated time counted by the timer are obtained to obtain the maximum value of the relative pressure amplitudes, and the timer is reset.
In one embodiment, the method is equivalent to that when the vehicle working condition meets the diagnosis condition, the relative pressure amplitude ppcvamp tmp_w is subjected to unified standardization processing, so that two conditions of fault and no fault can be obviously distinguished in the diagnosis process. The method comprises the steps of judging whether the current working condition meets the diagnosis condition or not, and if yes, controlling a timer to start timing; if not, the timing is not performed or stopped. When the accumulated time counted by the timer reaches the preset time length, the preset time length can be preferably 5s, namely, whether the accumulated time length of the timer reaches 5s is judged. It should be noted that, when the judgment condition is not satisfied, the timer is not timed, that is, the 5s of actual cumulative timing is not necessarily continuous, or the current working condition satisfies the diagnosis condition in the corresponding time of timing. After that, if the accumulated time length reaches 5s, acquiring all the relative pressure amplitudes ppcvomptmp_w in the accumulated time counted by the timer, and counting the maximum value of the relative pressure amplitudes ppcvomptmp in the crankcase ventilation pipe 3 in 5s, namely the maximum value ppcvompds (1) of the pressure amplitudes; if the timer cannot reach 5s, the pressure amplitude will not be processed. And if the accumulated time length reaches the preset time length, the timer returns to zero again to wait for the period corresponding to the next preset time length, namely if the timer returns to zero again, the maximum value ppcvamp (n) of the pressure amplitude in the next period of 5s is counted again. Wherein, as such, all pressure amplitude maxima ppcvampds (n) are stored for extraction for unified analysis during subsequent diagnostic procedures.
Step S4: all relative pressure amplitude maxima within a driving cycle are compared with diagnostic criteria.
In one embodiment, at step S4: in the step of comparing all the maximum values of the relative pressure amplitude in one driving cycle with diagnostic criteria including a failure threshold and a repair threshold: the step of comparing with the diagnostic criteria comprises: if a relative pressure amplitude maximum value is smaller than the fault threshold value, the fault counter counts up by 1; if there is a relative pressure amplitude maximum greater than the repair threshold, the no fault counter counts up by 1.
In one embodiment, after the vehicle has completed the complete ignition, operation, and extinction process, all the pressure amplitude maxima ppcvampds (n) are extracted and analyzed. The main analysis procedure is to compare the pressure amplitude maximum ppcvampds (n) with diagnostic criteria comprising: fault threshold and repair threshold. Wherein for specific values of the fault threshold and the repair threshold, the fault threshold may be preferably 4hPa; the repair threshold was 12hPa. Comparing all the pressure amplitude maximum values ppcvampds (n) in one driving cycle with the fault threshold value and the repair threshold value one by one, and if one of the pressure amplitude maximum values ppcvampds (n) is smaller than or equal to the fault threshold value 4hPa, increasing the count of the fault counter by 1; if there is a maximum value ppcvamp ds (n) greater than or equal to the repair threshold 12hPa, the no fault counter counts up by 1. The specific values of the fault threshold and the repair threshold are preferred results obtained through the post-experiment test of the method, and specifically reference may be made to fig. 3a, where fig. 3a is a plot of the test results of the amplitude method provided in the first embodiment of the present invention. It can be seen that a large number of points fall in the range of more than 12hPa and a small number fall in the range of less than 4hPa, so that it is preferable to consider that more than 12hPa belongs to the normal state and less than 4hPa belongs to the fault state, and diagnosis false alarm is presumed in the range of 4 to 12hPa. As can be seen from the above, the failure threshold value of 4hPa and the repair threshold value of 12hPa are preferable results obtained by experiments, and the present invention is not limited to the values exemplified in the present embodiment, and can be adjusted accordingly depending on the vehicle.
Step S5: and diagnosing according to the comparison result, and outputting a diagnosis result.
In one embodiment, in step S5: the step of diagnosing according to the comparison result and outputting the diagnosis result comprises the following steps: when the sum of the fault counter and the fault counter meets a counting threshold value, comparing the counting numerical values of the fault counter and the fault counter; outputting a drop fault warning when the fault counter value is greater than the no fault counter; and outputting repair fault prompt information or no fault prompt information when the fault counter value is smaller than the no fault counter value.
In one embodiment, after step S4 is performed, since the no-fault counter and the fault counter are both technical, when both sum only to meet the count threshold, wherein the technical threshold is preferably 5, that is, when the sum of the no-fault counter and the fault counter is equal to 5, the no-fault counter and the fault counter are compared in size: if the fault counter is larger than the fault counter, outputting a falling fault warning, namely, a falling fault exists in the high-load pipeline (close to the end of the crankcase); and if the fault counter is smaller than the fault-free counter, outputting repair fault prompt information or fault-free prompt information. The specific output mode may include, but is not limited to, a corresponding indicator lamp or informing the corresponding information to the user or the maintenance personnel through output equipment such as a screen, a loudspeaker and the like in a mode of not limited to graphics and texts and voice. It will be appreciated that the counting threshold and the output diagnosis result are both simple enumeration processes in the present embodiment, and are not limited to the technology, and the actual implementation may be changed according to the specific situation.
In one embodiment, the invention does not require calibrating the model pressure of the crankcase ventilation system under different engine working conditions according to the test vehicle, reduces the influence of vehicle difference on calibration data, and distinguishes fault and fault-free states according to the maximum value ppcvampds (n) of the pressure amplitude obtained after the processing of the actual measured pressure value ppcv of the PCV pressure sensor 6. The false alarm probability is extremely low, and the robustness is high. According to 3 sigma statistical analysis, the energy value method adopted by the normal pipeline near the air filtering end has the current fault threshold value of 0.68 and the false alarm fault risk rate of 5 per mill (probability of more than 0.68 in normal distribution (mu=0.14 and sigma=0.21); the amplitude method adopted by the invention is adopted at the end of the normal pipeline close to the crankcase, the current fault threshold value is 4hpa, the false alarm fault risk is 1.3 per mill (probability of less than 4hpa in normal distribution (mu=20.12, sigma=5.36)), and the false alarm rate is reduced by nearly 3/4. Reference is specifically made to fig. 3a to 4b. In general, the specific implementation flow of the crankcase ventilation pipeline drop diagnosis method provided in the first embodiment of the present invention may refer to fig. 5, and actually refer to the expansion of steps S1 to S5, and specific details may refer to the description of the corresponding steps in the foregoing, where the diagnosis condition for step S2 is already given in detail in fig. 5, and specific values of the fault threshold and the repair threshold included in the diagnosis standard value of S4 are therefore preferred in fig. 5, and thus, each value and the diagnosis standard value of the actual diagnosis condition are not limited to the examples in the drawings, and may be correspondingly adjusted according to the actual situation.
The method for diagnosing the falling off of the crankcase ventilation pipeline provided by the first embodiment of the invention comprises the following steps: step S1: acquiring the current working condition of the vehicle; step S2: when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value; step S3: performing a relative pressure amplitude process to obtain a relative pressure amplitude maximum value; step S4: comparing all relative pressure amplitude maxima within a drive cycle with diagnostic criteria; step S5: and diagnosing according to the comparison result, and outputting a diagnosis result. Therefore, the invention can distinguish whether the pipeline falls off or not according to the pressure fluctuation in the crankcase ventilation pipe so as to meet the diagnosis purpose. Compared with the prior art, the false alarm rate is greatly reduced, and the robustness is improved. The method has guiding significance for the pipeline drop diagnosis of the installation pressure sensor, reduces the time and human resources of calibration work while greatly reducing the false alarm rate, reduces the operation of users, increases the convenience of the users, and improves the use experience of the users.
Second embodiment
Fig. 6 is a schematic diagram of a first structure of a crankcase ventilation pipeline falling-off diagnosis device according to a second embodiment of the invention. For a clear description of the crankcase ventilation circuit drop-off diagnostic device 110 provided in the second embodiment of the present invention, please refer to fig. 1 and 6.
The crankcase ventilation line drop diagnosis device 110 according to the second embodiment of the present invention at least includes: a processor a101 and a memory a201, wherein the processor a101 is configured to execute a computer program A6 stored in the memory a201 to implement the steps of the crankcase ventilation conduit drop diagnosis method as described in the first embodiment.
In one embodiment, the crankcase ventilation line drop diagnosis device 110 provided in this embodiment includes at least one processor a101 and at least one memory a201. Wherein the at least one processor a101 may be referred to as a processing unit A1 and the at least one memory a201 may be referred to as a storage unit A2. Specifically, the storage unit A2 stores a computer program A6, which when executed by the processing unit A1, causes the crankcase ventilation line drop diagnosis device 110 provided in the present embodiment to implement the steps of the crankcase ventilation line drop diagnosis method as described in the first embodiment. For example, step S1 shown in fig. 1: acquiring the current working condition of the vehicle; step S2: when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value; step S3: performing a relative pressure amplitude process to obtain a relative pressure amplitude maximum value; step S4: comparing all relative pressure amplitude maxima within a drive cycle with diagnostic criteria; step S5: and diagnosing according to the comparison result, and outputting a diagnosis result.
In an embodiment, the crankcase ventilation line drop diagnosis device 110 provided in this embodiment may include a plurality of memories a201 (simply referred to as a storage unit A2).
The storage unit A2 may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Wherein the nonvolatile Memory may be Read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory cell A2 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
In one embodiment, the storage unit A2 preferably stores the crankcase ventilation circuit drop diagnosis method provided by the first embodiment of the present invention. Still further, the value of the obtained pressure value ppcv obtained by the pressure sensor 6 may be temporarily stored, and the processor a101 may correspond to the obtained series of values such as the pressure sample difference value dppcv, the pressure wave peak value ppcvp, the pressure trough value ppcvv, the relative pressure amplitude ppcvmptmp_w, and finally the pressure amplitude maximum value ppcvmpds (n) for diagnosis. When the processor a101 needs to perform calculation or reading for diagnosis, the corresponding value stored in the previous execution step can be read from the storage unit A2.
In one embodiment, the crankcase ventilation line fall-off diagnostic device 110 may also include a bus that connects the different components (e.g., the processor A101 and the memory A201, the output device A3, etc.). The output device A3 can output a corresponding diagnosis result after the diagnosis is completed, and the specific output device may include, but is not limited to, a display device displaying the diagnosis result to a user through an image-text manner; the voice broadcasting device displays the voice broadcasting information to a user in a voice playing mode; the display device can also be an icon display device, and the display device can be used for displaying corresponding icons, such as fault icons on a vehicle dashboard, for prompting a user, and can be more succinctly used as corresponding indicator lamps, such as red indicator lamps corresponding to falling fault warning, yellow corresponding to repairing fault prompting information, green corresponding to no-fault prompting information and the like. The above output device may be any one of the above examples, or may be any combination of two or more, and the above examples are not particularly limited, and the examples are merely illustrative of techniques, and any device that can divise the diagnosis result to the user may be used.
In one embodiment, the crankcase ventilation line disconnection diagnostic device 110 of the present embodiment may further include a communication interface (e.g., I/O interface A4) that may be used to communicate with an external device. For example, as shown in the figure, the output device A3 is connected to the processor a101 through the I/O interface A4, and serves as an intermediary for data transmission, a bridge, and the like.
In one embodiment, an I/O interface A4 may be connected to the vehicle can bus to obtain information about the current operating condition of the vehicle, so that the processor a101 determines whether the operating condition of the vehicle meets the diagnostic condition to perform diagnosis.
In an embodiment, the crankcase ventilation line drop diagnosis device 110 provided in this embodiment may further include a communication device A5. Specifically, the communication device A5 may output the diagnosis result to the other terminal associated with the crankcase ventilation line fall-off diagnosis device 110 after the diagnosis is completed. In particular, techniques employed by the communication connection include, but are not limited to, wireless, wired communication techniques. Still further, for wired communication techniques, it may include, but is not limited to, ethernet (ETH), M-BUS, power line communication (Power Line Communication, PLC), universal serial BUS (Universal Serial Bus, USB), RS-485, RS-232, etc.; for Wireless communication technologies including, but not limited to, global system for mobile communications (Global System for Mobile Communication, GSM), enhanced mobile communications technology (Enhanced Data GSM Environment, EDGE), wideband code division multiple access (wideband code division multiple access, W-CDMA), code division multiple access (Code division access, CDMA), time division multiple access (time division multiple access, TDMA), bluetooth, wireless Fidelity (WiFi) (e.g., american society of electrical and electronic engineers standards IEEE802.11 a, IEEE802.11b, IEEE802.11g, and/or IEEE802.11 n), internet telephony (Voice over internet protocal, voIP), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wi-Max), other protocols for mail, instant messaging, and short messaging, as well as any other suitable communication protocols, even those not currently developed. In a specific embodiment, after the user extinguishes, the crankcase ventilation line falling off diagnostic device 110 performs a complete diagnosis, and sends the diagnosis result to the mobile terminal of the user or the maintenance terminal of the maintenance personnel through the communication device A5, so that the user or the maintenance personnel can review the diagnosis result through the corresponding terminal, and the diagnosis result is not troublesome to acquire through the crankcase ventilation line falling off diagnostic device 110 arranged in the vehicle.
The crankcase ventilation line drop diagnosis device 110 provided in the second embodiment of the present invention includes a memory a101 and a processor a201, and the processor a101 is configured to execute a computer program A6 stored in the memory a201 to implement the steps of the crankcase ventilation line drop diagnosis method as described in the first embodiment, so that the crankcase ventilation line drop diagnosis device 110 provided in the present embodiment can distinguish whether the line is dropped or not according to the "crankcase ventilation line pressure fluctuation" to satisfy the diagnosis purpose. Compared with the prior art, the false alarm rate is greatly reduced, and the robustness is improved. The method has guiding significance for the pipeline drop diagnosis of the installation pressure sensor, reduces the time and human resources of calibration work while greatly reducing the false alarm rate, reduces the operation of users, increases the convenience of the users, and improves the use experience of the users.
The second embodiment of the present invention also provides a vehicle including the crankcase ventilation pipeline falling-off diagnosis device 110 provided in the second embodiment of the present invention.
In one embodiment, the specific method of installing the crankcase ventilation circuit fall-off diagnostic device 110 may include, but is not limited to, being a separate device in the vehicle; or may be a unit in the PCV system, i.e., contained within the PCV system; and the system can also be a functional module in the vehicle-mounted terminal, and all the embodiments can be correspondingly executed by the vehicle-mounted terminal in the vehicle. It will be appreciated that the above examples are illustrative of techniques and that the actual placement is not limited to the above examples.
The second embodiment of the present application also provides a computer-readable storage medium storing a computer program A6, which when executed by the processor a101, implements the steps of the crankcase ventilation conduit drop diagnosis method as described in the first embodiment.
In an implementation, the computer readable storage medium provided by the present embodiment may include any entity or device capable of carrying computer program code, a recording medium, e.g., ROM, RAM, magnetic discs, optical discs, flash memories, etc.
The technical effects that can be achieved when the computer program A6 stored in the computer readable storage medium provided in the second embodiment of the present application is executed by the processor a101 are already described in more detail, and will not be described in detail herein.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the application may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment. In this document, unless otherwise indicated, the meaning of "a plurality", "a number" is two or more.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It will be appreciated by those of ordinary skill in the art that all or part of the steps of implementing the above-described method embodiments may be implemented by hardware associated with program instructions, and the above-described program may be stored in a computer readable storage medium, which when executed, performs the steps comprising the above-described method embodiments. The aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method for diagnosing the falling-off of a crankcase ventilation pipeline is characterized by comprising the following steps:
acquiring the current working condition of the vehicle;
when the current working condition meets the diagnosis condition, acquiring a pressure value in the crankcase ventilation pipe, and correspondingly acquiring a relative pressure amplitude according to the pressure value;
when the current working condition does not meet the diagnosis condition, the timer is controlled to stop timing; when the current working condition meets the diagnosis condition, a timer is controlled to start timing; judging whether the accumulated time counted by the timer reaches a preset duration or not; if yes, acquiring all the relative pressure amplitudes in the accumulated time counted by the timer to obtain the maximum value of the relative pressure amplitudes, and resetting the timer;
comparing all of said relative pressure amplitude maxima within a drive cycle to diagnostic criteria; the diagnosis standard value comprises a fault threshold value and a repair threshold value; if one of the relative pressure amplitude maxima is less than the fault threshold, the fault counter counts up by 1; if one of the maximum values of the relative pressure amplitude is greater than the repair threshold, the fault-free counter counts by 1;
When the sum of the fault counter and the fault counter meets a counting threshold value, comparing the counting numerical values of the fault counter and the fault counter; outputting a drop fault warning when the fault counter value is greater than the no fault counter; and outputting repair fault prompt information or no fault prompt information when the fault counter value is smaller than the no fault counter value.
2. The crankcase ventilation conduit disconnection diagnosing method according to claim 1, wherein the step of acquiring the current operating condition of the vehicle includes:
acquiring current temperature information, wherein the current temperature information comprises an ambient temperature, a current engine coolant temperature and a delay time;
acquiring current engine working condition information, wherein the engine working condition information comprises an engine air inlet flow value, an engine air inlet flow change value, an engine rotating speed and a supercharging pressure;
and acquiring the current working information of the pressure sensor.
3. The crankcase ventilation line sloughing diagnostic method of claim 2, the diagnostic conditions comprising:
when the ambient temperature is higher than a preset temperature threshold, and the delay time reaches a first time threshold; or when the ambient temperature is lower than a preset temperature threshold, the temperature of the engine coolant reaches a corresponding coolant temperature threshold, and the corresponding delay time reaches a second time threshold;
The engine intake air flow value is within a flow threshold range;
the engine intake air flow change value is in a change threshold range;
the engine speed is within a preset speed range;
the boost pressure is greater than a boost threshold;
the working information of the pressure sensor accords with normal working conditions.
4. The crankcase ventilation line dropout diagnosis method according to claim 1, wherein the step of acquiring diagnosis information when the current operating condition satisfies a diagnosis condition includes:
when the current working condition meets the diagnosis condition, acquiring a plurality of pressure values according to a preset frequency;
calculating a pressure sample difference value of two adjacent pressure values;
judging whether the pressure sample difference value is larger than 0:
if yes, assigning a new pressure value in the two pressure values to a pressure wave peak value;
if not, assigning a new pressure value in the two pressure values to a pressure trough value;
and calculating the difference between the current pressure wave peak value and the current trough value after each assignment to obtain the corresponding relative pressure amplitude, and storing the relative pressure amplitude.
5. A crankcase ventilation line dropout diagnostic device comprising a processor and a memory:
The processor is configured to execute a computer program stored in the memory to implement the crankcase ventilation conduit sloughing diagnostic method steps of any one of claims 1 to 4.
6. A vehicle comprising the crankcase ventilation line dropout diagnostic device according to claim 5.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the steps of the crankcase ventilation line fall-off diagnosis method according to any one of claims 1 to 4.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4271402A (en) * | 1979-08-29 | 1981-06-02 | General Motors Corporation | Motor vehicle diagnostic and monitoring device having keep alive memory |
| US5546795A (en) * | 1994-05-26 | 1996-08-20 | Unisia Jecs Corporation | Method and apparatus for diagnosis of trouble in supercharging pressure sensor |
| JPH1026055A (en) * | 1996-07-09 | 1998-01-27 | Toyota Motor Corp | Trouble diagnosing device for fuel steam treating device |
| JP2010096029A (en) * | 2008-10-14 | 2010-04-30 | Toyota Motor Corp | Blow-by gas treatment device for internal combustion engine |
| WO2016050742A1 (en) * | 2014-10-02 | 2016-04-07 | Hengst Se & Co. Kg | Internal combustion engine comprising a crankcase ventilation device, and method for monitoring a crankcase ventilation device |
| CN109026277A (en) * | 2018-06-29 | 2018-12-18 | 联合汽车电子有限公司 | Internal combustion engine crankcase ventilation system leakage monitoring structure and its monitoring method |
| CN111120041A (en) * | 2019-12-25 | 2020-05-08 | 中国第一汽车股份有限公司 | Crankcase ventilation system for supercharged engine and detection method of ventilation system |
| DE102020103520A1 (en) * | 2019-02-12 | 2020-08-13 | Ford Global Technologies, Llc | PROCEDURE AND SYSTEM FOR MONITORING CRANKCASE VENTILATION |
| CN112360627A (en) * | 2020-10-26 | 2021-02-12 | 安徽江淮汽车集团股份有限公司 | Crankcase ventilation pipeline diagnosis method, device, equipment and storage medium |
| CN112412667A (en) * | 2020-12-04 | 2021-02-26 | 安徽江淮汽车集团股份有限公司 | Low desorption pipeline diagnosis method, diagnosis terminal, vehicle and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10320054A1 (en) * | 2003-05-06 | 2004-11-25 | Robert Bosch Gmbh | Method and device for operating an internal combustion engine |
| US10619534B2 (en) * | 2012-09-14 | 2020-04-14 | Ford Global Technologies, Llc | Crankcase integrity breach detection |
| US10043352B2 (en) * | 2016-09-14 | 2018-08-07 | Fca Us Llc | Techniques for detecting a disconnected engine air hose using an in-line pressure sensor |
-
2021
- 2021-04-27 CN CN202110462571.7A patent/CN115217624B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4271402A (en) * | 1979-08-29 | 1981-06-02 | General Motors Corporation | Motor vehicle diagnostic and monitoring device having keep alive memory |
| US5546795A (en) * | 1994-05-26 | 1996-08-20 | Unisia Jecs Corporation | Method and apparatus for diagnosis of trouble in supercharging pressure sensor |
| JPH1026055A (en) * | 1996-07-09 | 1998-01-27 | Toyota Motor Corp | Trouble diagnosing device for fuel steam treating device |
| JP2010096029A (en) * | 2008-10-14 | 2010-04-30 | Toyota Motor Corp | Blow-by gas treatment device for internal combustion engine |
| WO2016050742A1 (en) * | 2014-10-02 | 2016-04-07 | Hengst Se & Co. Kg | Internal combustion engine comprising a crankcase ventilation device, and method for monitoring a crankcase ventilation device |
| CN109026277A (en) * | 2018-06-29 | 2018-12-18 | 联合汽车电子有限公司 | Internal combustion engine crankcase ventilation system leakage monitoring structure and its monitoring method |
| DE102020103520A1 (en) * | 2019-02-12 | 2020-08-13 | Ford Global Technologies, Llc | PROCEDURE AND SYSTEM FOR MONITORING CRANKCASE VENTILATION |
| CN111550313A (en) * | 2019-02-12 | 2020-08-18 | 福特全球技术公司 | Method and system for crankcase ventilation monitoring |
| CN111120041A (en) * | 2019-12-25 | 2020-05-08 | 中国第一汽车股份有限公司 | Crankcase ventilation system for supercharged engine and detection method of ventilation system |
| CN112360627A (en) * | 2020-10-26 | 2021-02-12 | 安徽江淮汽车集团股份有限公司 | Crankcase ventilation pipeline diagnosis method, device, equipment and storage medium |
| CN112412667A (en) * | 2020-12-04 | 2021-02-26 | 安徽江淮汽车集团股份有限公司 | Low desorption pipeline diagnosis method, diagnosis terminal, vehicle and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 重型柴油机失火诊断研究;张韬略;孙强;何建辉;田丰;杨林;;车用发动机(01);全文 * |
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| Publication number | Publication date |
|---|---|
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