CN117705426A - Diagnostic calibration method for engine crankcase ventilation system - Google Patents
Diagnostic calibration method for engine crankcase ventilation system Download PDFInfo
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- CN117705426A CN117705426A CN202311458889.3A CN202311458889A CN117705426A CN 117705426 A CN117705426 A CN 117705426A CN 202311458889 A CN202311458889 A CN 202311458889A CN 117705426 A CN117705426 A CN 117705426A
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- 238000012360 testing method Methods 0.000 claims abstract description 42
- 238000003745 diagnosis Methods 0.000 claims abstract description 28
- 230000008439 repair process Effects 0.000 claims abstract description 15
- 238000007689 inspection Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 239000013255 MILs Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
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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
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Abstract
The invention discloses a diagnosis and calibration method for an engine crankcase ventilation system, which belongs to the technical field of whole vehicle calibration and comprises the following steps: s1, diagnosing and calibrating a conductive tube, which comprises the following steps: pipeline disconnection test, PCV conductive pipeline voltage too low test and PCV conductive pipeline voltage too high test; s2, diagnosing and calibrating the idle speed, comprising the following steps: testing whether the vehicle to be calibrated is qualified or not and performing fault diagnosis test when the PCV pipeline is disconnected; s3, diagnosing and calibrating the primary and secondary charging deviation, including: fault-free misjudgment trend test, fault detection and repair inspection and WLTC circulation IUPR molecular growth inspection. The calibration method can accurately judge whether the crankcase ventilation system has faults or not by monitoring the voltage or idling performance of the two ends of the conducting tube circuit; the crankcase ventilation system can be ensured to timely report response faults when faults occur, a driver is reminded to timely go to a relevant maintenance place for maintenance, and pollutants are reduced to be discharged into the atmosphere.
Description
Technical Field
The invention belongs to the technical field of whole vehicle calibration, and particularly relates to a diagnosis and calibration method for an engine crankcase ventilation system.
Background
With the increasing level of national economy, environmental awareness is becoming more and more stringent, and current light vehicle emission regulations are executing "GB 18352.6-2016 light vehicle pollutant emission limits and measurement methods (chinese sixth phase)", wherein no pollutant is allowed to be discharged into the atmosphere from the crankcase ventilation system (PCV) of an engine. The crankcase ventilation system re-draws unburned mixture that leaks into the crankcase into the cylinder for combustion. The national six-emission regulation monitors the crankcase ventilation system, requires the production enterprises to monitor the crankcase ventilation system, ensures the system integrity, and detects faults if the crankcase is disconnected with the PCV valve or the PCV valve is disconnected with the air inlet manifold, namely the crankcase diagnosis function is to monitor whether the crankcase ventilation pipe breaks down or not, and if the break down fault is detected, a fault lamp needs to be lighted to remind a user to go to a relevant maintenance place for maintenance as soon as possible so as to prevent the crankcase blowby gas from leaking into the atmosphere to cause environmental pollution.
Therefore, engine crankcase ventilation system diagnostics are very important.
Disclosure of Invention
Aiming at the defects in the diagnosis aspect of the engine crankcase ventilation system in the prior art, the invention provides a diagnosis and calibration method of the engine crankcase ventilation system, which comprises a calibration method adopting a conducting tube diagnosis scheme and an idle speed diagnosis scheme, and can accurately judge whether the crankcase ventilation system has faults or not by monitoring the voltage or idle speed performance of the two ends of a conducting tube circuit. The method can ensure that the crankcase ventilation system can timely report response faults when faults occur, remind a driver to timely go to a relevant maintenance place for maintenance, and reduce pollutant emission into the atmosphere.
The invention is realized by the following technical scheme:
a diagnosis and calibration method for a crankcase ventilation system of an engine specifically comprises the following steps:
s1, diagnosing and calibrating a conductive tube, which comprises the following steps:
s11, pipeline disconnection test;
s12, testing the voltage of the PCV conductive pipeline to be too low;
s13, testing the voltage of the PCV conductive pipeline to be too high;
s2, diagnosing and calibrating the idle speed, comprising the following steps:
s21, testing whether the vehicle to be calibrated is qualified or not;
s22, performing fault diagnosis test when the PCV pipeline is disconnected;
s3, diagnosing and calibrating the primary and secondary charging deviation, including:
s31, testing fault-free misjudgment tendency;
s32, fault detection and repair inspection;
s33, checking the molecular growth of WLTC circulation IUPR.
Further, the pipeline disconnection test in step S11 specifically includes the following:
a. disconnecting the PCV high-load pipeline, and checking whether the voltage high fault of the crankcase ventilation pipe diagnosis circuit can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. inserting the PCV pipeline back, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
Further, the test for the low voltage of the PCV conductive line in step S12 specifically includes the following steps:
a. short-circuiting the Pin of the PCV conductive pipeline, and checking whether the fault of the PCV conductive pipeline with too low voltage can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
Further, the test for the excessive voltage of the PCV conductive line in step S13 specifically includes the following steps:
a. a Pin of the PCV conductive pipeline is short in power supply, and whether the fault of the PCV conductive pipeline with excessive voltage can be reported is checked;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
Further, the step S21 of testing whether the vehicle to be calibrated is qualified specifically includes the following steps:
when the PCV pipeline is normal, under the state of full heat engine, checking the value of the leakage quantity of the throttle valve and the difference between the primary charge and the secondary charge under the idle working condition;
if the leakage amount of the throttle valve is larger than 8kg/h, indicating that the condition of overlarge difference between the air leakage amount of the throttle valve or the main charge and the secondary charge exists, continuously analyzing whether the leakage exists in the air inlet system of the vehicle or not, and judging whether the PCV diagnosis and check are influenced or not; if so, the vehicle should be replaced for a match check.
Further, the fault diagnosis test for the PCV line disconnection in step S22 specifically includes the following:
after the PCV low-load ventilation pipeline is disconnected, idling is continued for a period of time, and after the self-learning stability of the throttle leakage is achieved, the idle speed is checked to be continuously higher than the target idle speed or to fluctuate severely.
Further, if it is checked that the idle rotation speed is continuously higher than the target idle speed, the following parameters are checked:
a. whether the idle speed deviation can continuously exceed a high idle diagnostic threshold;
b. checking the values of the ignition angle and the minimum ignition angle, which should be equal;
c. and whether the high idle speed fault can be reported.
Further, if it is checked that the idle rotation speed is in a severe fluctuation, the following parameters are checked:
a. whether the rationality fault flag bit of the pressure sensor is frequently set and reset or not, if not, the reason of idle speed fluctuation needs to be ascertained;
b. the idle speed fluctuation is too large, and whether the engine idle speed is low or not can be reported;
c, performing fault repair inspection after the PCV pipeline is recovered; and c, after the step b is finished, recovering the PCV low-load pipeline, and checking whether the engine speed is recovered to be normal or not and whether the fault can be repaired or not.
Further, the fault-free erroneous-judgment tendency test in step S31, specifically, checking whether there is a risk of erroneous judgment by the normally driven vehicle when the magnitude of the air leakage self-learning value is greater than 8kg/h, and indicating that there is no risk of erroneous judgment when the air leakage self-learning value is greater than 8 kg/h.
Further, the fault detection and repair check in step S32 specifically includes the following:
disconnecting the PCV low-load pipeline, driving the vehicle normally, and checking whether the fault of excessive deviation of the inflation model can be reported; and after the fault is reported, recovering the PCV pipeline, and checking whether the fault can be repaired.
Compared with the prior art, the invention has the following advantages:
the invention relates to a diagnosis and calibration method for a crankcase ventilation system of an engine, which comprises a calibration method adopting a conducting tube diagnosis scheme and an idle speed diagnosis scheme, and can accurately judge whether the crankcase ventilation system has faults or not by monitoring the voltage or idle speed performance of two ends of a conducting tube circuit. The method can ensure that the crankcase ventilation system can timely report response faults when faults occur, remind a driver to timely go to a relevant maintenance place for maintenance, and reduce pollutant emission into the atmosphere.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a flow chart of a diagnostic calibration method for an engine crankcase ventilation system of the present invention;
FIG. 2 is a schematic diagram of a PCV system configuration of a supercharged engine;
FIG. 3 is a schematic diagram of a conductive tube diagnostic calibration flow;
FIG. 4 is a schematic diagram of an idle diagnostic calibration flow;
FIG. 5 is a schematic diagram of a primary and secondary charge bias diagnostic calibration flow.
Detailed Description
For a clear and complete description of the technical scheme and the specific working process thereof, the following specific embodiments of the invention are provided with reference to the accompanying drawings in the specification:
in the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Example 1
A diagnosis and calibration method for a crankcase ventilation system of an engine specifically comprises the following steps:
s1, diagnosing and calibrating a conductive tube, which comprises the following steps:
s11, pipeline disconnection test;
s12, testing the voltage of the PCV conductive pipeline to be too low;
s13, testing the voltage of the PCV conductive pipeline to be too high;
s2, diagnosing and calibrating the idle speed, comprising the following steps:
s21, testing whether the vehicle to be calibrated is qualified or not;
s22, performing fault diagnosis test when the PCV pipeline is disconnected;
s3, diagnosing and calibrating the primary and secondary charging deviation, including:
s31, testing fault-free misjudgment tendency;
s32, fault detection and repair inspection;
s33, checking the molecular growth of WLTC circulation IUPR.
Example 2
A schematic structure diagram of a PCV system of a supercharged engine is shown in FIG. 2, a low-load ventilation pipeline is connected with an intake manifold and a crankcase, and under a low-load working condition, a large negative pressure exists in the intake manifold, so that blow-by gas in the crankcase can be sucked into the intake manifold through the low-load pipeline. When the low-load vent pipe breaks down, blow-by gas in the crankcase leaks to the atmosphere, and therefore the low-load vent pipe breaks down needs to be monitored.
The high-load ventilation pipeline is connected with the pressurizing forward air inlet pipeline and the crankcase. In the middle-high load working condition, no negative pressure exists in the air inlet manifold, and the negative pressure exists in the air inlet pipe after the air filtration, so that blow-by gas in the crankcase can be sucked into the air inlet pipe through the high-load ventilation pipe, and the ventilation pipe is also called as a high-load ventilation pipe. High load line disconnection also causes blow-by gas leakage, and thus high load vent line disconnection failure needs to be monitored.
Before the diagnosis and calibration test of the crankcase ventilation system, the corresponding module work should be completed and calibration data are preset. The test vehicle links the calibration test tool. Wherein the test car crankcase ventilation system should be consistent with batch conditions. The vehicle state is normal. Fig. 1 is a schematic flow chart of a diagnostic calibration method for an engine crankcase ventilation system according to the present embodiment, where the calibration method specifically includes the following steps:
1. as shown in fig. 3, the calibration and inspection method for the conductive tube diagnostic scheme is as follows:
(1) Pipeline disconnection inspection (both ends are disconnected and need to be inspected);
a. disconnecting the PCV high-load pipeline, and checking whether the voltage high fault of the crankcase ventilation pipe diagnosis circuit can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. inserting the PCV pipeline back, and checking whether the fault can be repaired;
d. after three driving cycles of repairing, checking whether the fault can be completely repaired or not, and whether the MIL lamp can be extinguished or not;
(2) Checking the voltage of PCV conductive pipelines to be too low;
a. short-circuiting the Pin of the PCV conductive pipeline, and checking whether the fault of the PCV conductive pipeline with too low voltage can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repairing, checking whether the fault can be completely repaired or not, and whether the MIL lamp can be extinguished or not;
(3) Detecting the over-high voltage of the PCV conductive pipeline;
a. a Pin of the PCV conductive pipeline is short in power supply, and whether the fault of the PCV conductive pipeline with excessive voltage can be reported is checked;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repairing, checking whether the fault can be completely repaired or not, and whether the MIL lamp can be extinguished or not;
2. as shown in fig. 4, the idle diagnostic protocol calibration checking method is as follows:
(1) Calibrating and testing the vehicle for inspection;
when the PCV pipeline is normal, under the state of a full heat engine, the value of the leakage amount of the throttle valve and the difference between the primary charge and the secondary charge are checked under the idle working condition. Normally, the throttle leakage should be less than 8kg/h, and the main charge and the sub-charge should be substantially equal. If there is a condition that the throttle air leakage amount or the difference between the main charge and the sub charge is too large, it should be analyzed whether there is a serious leakage of the vehicle air intake system or whether the PCV diagnostic check is affected. If so, a better replacement condition of the vehicle should be required for a match check.
(2) Fault diagnosis and inspection when the PCV pipeline is disconnected;
after the PCV low-load ventilation pipeline is disconnected, idling is continued for a period of time, after the self-learning stability of the throttle leakage is achieved, whether the idling rotation speed is continuously higher than the target idling or severely fluctuates is checked, and if the idling rotation speed is continuously higher, the following parameters are checked:
a. whether the idle speed deviation can continue to exceed the high idle diagnostic threshold. In order to ensure that the high idle speed can be successfully reported and confirmed, the rotation speed deviation should be continuously higher than a Gao Daisu diagnosis threshold;
b. checking the values of the ignition angle and the minimum ignition angle, which should be equal;
c. whether the high idle speed fault can be reported;
if the rotational speed fluctuates drastically, the following parameters are checked:
a. whether the rationality fault flag bit of the pressure sensor is frequently set and reset or not, if not, the reason of idle speed fluctuation needs to be ascertained;
b. the idle speed fluctuation is too large, and whether the engine idle speed is low or not can be reported;
and c, performing fault repair inspection after the PCV pipeline is recovered. And c, after the step b is finished, recovering the PCV low-load pipeline, and checking whether the engine speed is recovered to be normal or not and whether the fault can be repaired or not.
3. As shown in fig. 5, the primary and secondary charging deviation diagnosis scheme calibration checking method comprises the following steps:
a. and (5) checking no fault misjudgment tendency. In a fault-free state, the vehicle is normally driven, the magnitude of the self-learning value of the air leakage is checked, and whether the risk of misjudgment exists or not (under the general condition, the value is not more than 8 kg/h);
b. fault detection and repair inspection. Disconnecting the PCV low-load pipeline, driving the vehicle normally, and checking whether the fault of excessive deviation of the inflation model can be reported; after the fault is reported, recovering the PCV pipeline, and checking whether the fault can be repaired;
wltc cycle IUPR molecular growth check. In the no fault state, WLTC drain cycle is performed to check if the molecular denominator of IUPR can be grown.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The diagnosis and calibration method for the engine crankcase ventilation system is characterized by comprising the following steps of:
s1, diagnosing and calibrating a conductive tube, which comprises the following steps:
s11, pipeline disconnection test;
s12, testing the voltage of the PCV conductive pipeline to be too low;
s13, testing the voltage of the PCV conductive pipeline to be too high;
s2, diagnosing and calibrating the idle speed, comprising the following steps:
s21, testing whether the vehicle to be calibrated is qualified or not;
s22, performing fault diagnosis test when the PCV pipeline is disconnected;
s3, diagnosing and calibrating the primary and secondary charging deviation, including:
s31, testing fault-free misjudgment tendency;
s32, fault detection and repair inspection;
s33, checking the molecular growth of WLTC circulation IUPR.
2. The diagnostic calibration method for an engine crankcase ventilation system of claim 1, wherein the line disconnection test of step S11 specifically comprises the following steps:
a. disconnecting the PCV high-load pipeline, and checking whether the voltage high fault of the crankcase ventilation pipe diagnosis circuit can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. inserting the PCV pipeline back, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
3. The diagnostic calibration method for an engine crankcase ventilation system of claim 1, wherein the step S12 of testing the PCV conductive line for a too low voltage comprises the following steps:
a. short-circuiting the Pin of the PCV conductive pipeline, and checking whether the fault of the PCV conductive pipeline with too low voltage can be reported;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
4. The diagnostic calibration method for an engine crankcase ventilation system of claim 1, wherein the step S13 of testing the excessive voltage of the PCV conductive line specifically comprises the following steps:
a. a Pin of the PCV conductive pipeline is short in power supply, and whether the fault of the PCV conductive pipeline with excessive voltage can be reported is checked;
b. restarting the vehicle, checking whether the fault can be confirmed, and whether the MIL lamp is lighted;
c. recovering Pin pins of the PCV conductive pipeline, and checking whether the fault can be repaired;
d. after three driving cycles of repair, it is checked whether the fault can be completely repaired and the MILs lamp can be extinguished.
5. The diagnostic calibration method for the crankcase ventilation system of the engine according to claim 1, wherein the testing of whether the vehicle to be calibrated is qualified in step S21 specifically comprises the following steps:
when the PCV pipeline is normal, under the state of full heat engine, checking the value of the leakage quantity of the throttle valve and the difference between the primary charge and the secondary charge under the idle working condition;
if the leakage amount of the throttle valve is larger than 8kg/h, indicating that the condition of overlarge difference between the air leakage amount of the throttle valve or the main charge and the secondary charge exists, continuously analyzing whether the leakage exists in the air inlet system of the vehicle or not, and judging whether the PCV diagnosis and check are influenced or not; if so, the vehicle should be replaced for a match check.
6. The diagnostic calibration method for an engine crankcase ventilation system according to claim 1, wherein the fault diagnosis test for the PCV line disconnection in step S22 specifically comprises the following steps:
after the PCV low-load ventilation pipeline is disconnected, idling is continued for a period of time, and after the self-learning stability of the throttle leakage is achieved, the idle speed is checked to be continuously higher than the target idle speed or to fluctuate severely.
7. A method of diagnostic calibration of an engine crankcase ventilation system as defined in claim 6, wherein if the idle speed is checked to be consistently above the target idle speed, the following parameters are checked:
a. whether the idle speed deviation can continuously exceed a high idle diagnostic threshold;
b. checking the values of the ignition angle and the minimum ignition angle, which should be equal;
c. and whether the high idle speed fault can be reported.
8. A method for diagnostic calibration of an engine crankcase ventilation system as defined in claim 6, wherein if the idle speed is checked for severe fluctuations, the following parameters are checked:
a. whether the rationality fault flag bit of the pressure sensor is frequently set and reset or not, if not, the reason of idle speed fluctuation needs to be ascertained;
b. the idle speed fluctuation is too large, and whether the engine idle speed is low or not can be reported;
c, performing fault repair inspection after the PCV pipeline is recovered; and c, after the step b is finished, recovering the PCV low-load pipeline, and checking whether the engine speed is recovered to be normal or not and whether the fault can be repaired or not.
9. The diagnostic calibration method for the crankcase ventilation system of the engine according to claim 1, wherein the fault-free erroneous judgment tendency test in step S31, specifically, the normal driving vehicle checks the magnitude of the air leakage self-learning value, and if there is a risk of erroneous judgment, the air leakage self-learning value is greater than 8kg/h, indicating that there is no risk of erroneous judgment.
10. The diagnostic calibration method for the crankcase ventilation system of the engine according to claim 1, wherein the fault-free erroneous judgment tendency test in step S31, specifically, the normal driving vehicle checks the magnitude of the air leakage self-learning value, and if there is a risk of erroneous judgment, the air leakage self-learning value is greater than 8kg/h, indicating that there is no risk of erroneous judgment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311458889.3A CN117705426A (en) | 2023-11-04 | 2023-11-04 | Diagnostic calibration method for engine crankcase ventilation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311458889.3A CN117705426A (en) | 2023-11-04 | 2023-11-04 | Diagnostic calibration method for engine crankcase ventilation system |
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| CN117705426A true CN117705426A (en) | 2024-03-15 |
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| CN202311458889.3A Pending CN117705426A (en) | 2023-11-04 | 2023-11-04 | Diagnostic calibration method for engine crankcase ventilation system |
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- 2023-11-04 CN CN202311458889.3A patent/CN117705426A/en active Pending
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