CN106382165B - A kind of online fault detection method and system of diesel engine - Google Patents
A kind of online fault detection method and system of diesel engine Download PDFInfo
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- CN106382165B CN106382165B CN201611060445.4A CN201611060445A CN106382165B CN 106382165 B CN106382165 B CN 106382165B CN 201611060445 A CN201611060445 A CN 201611060445A CN 106382165 B CN106382165 B CN 106382165B
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- 238000001514 detection method Methods 0.000 title claims abstract description 60
- 239000000523 sample Substances 0.000 claims abstract description 367
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 206010055001 Hypodontia Diseases 0.000 claims description 15
- 206010002583 anodontia Diseases 0.000 claims description 15
- 230000005213 hypodontia Effects 0.000 claims description 15
- 201000006680 tooth agenesis Diseases 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 230000009191 jumping Effects 0.000 claims description 4
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000012217 deletion Methods 0.000 description 10
- 230000037430 deletion Effects 0.000 description 10
- 239000002283 diesel fuel Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 238000007726 management method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses the online fault detection methods and system of a kind of diesel engine, this method comprises: the second tach signal that the first tach signal and free end speed probe that the flywheel end speed probe for obtaining real-time measurement generates generate；Detect the first tach signal, whether the second tach signal jumps；When detecting that the first tach signal and/or the second tach signal jump do not occur, the fault count value of the corresponding flywheel end speed probe of the first tach signal and/or the corresponding free end speed probe of the second tach signal is reinforced into definite value；Whether the fault count value of the fault count value and free end speed probe that judge flywheel end speed probe is more than limits value；If being more than limits value, determine the corresponding speed probe of the fault count value for failure speed probe.The present invention realizes in the case where not needing to shut down and driver operates by whether there is skip signal in real-time detection tach signal, carries out online fault detection to diesel engine.
Description
Technical field
The present invention relates to electronic Control for Diesel Engine field, in particular to the online fault detection method of a kind of diesel engine and it is
System.
Background technique
Crankshaft rotational speed sensor is the important component of electronic diesel control, and electric-control system is known according to crankshaft signal
The position of piston, and then determine fuel feeding moment and fuel delivery.Crankshaft rotational speed sensor normally whether and speed of crankshaft
The quality of signal seriously affects engine power performance, economy and discharge, declines in dropout or serious unfavorable condition
It will cause diesel engine stop.
In existing diesel electric-controlled system fault diagnostic techniques, voltage that diesel engine is exported by direct measurement sensor
To judge failure.When output voltage is more than the maximum magnitude of controller setting, that is, judge that sensor breaks down.
The prior art has the disadvantage that
Disadvantage 1: judging that failure is not accurate enough by voltage, for example, when sensor characteristics changes or occur zero point
When drift, existing detection method can not detect the system failure of diesel engine, missing inspection easily occur.
Disadvantage 2: the voltage of output is influenced by power-supply system, if power-supply system is unstable, existing detection method easily occurs
Erroneous detection.
Based on the above issues, technical solution of the present invention is proposed.The present invention is not needing to shut down and do not need driver
In the case where operation, proposes a kind of succinct, quickly and effectively diesel engine online fault detection method, electric-control system can be improved
Stability and reliability.
Summary of the invention
The object of the present invention is to provide a kind of online fault detection methods of diesel engine, according to the technical solution of the present invention,
In the case where not needing diesel engine stop and not needing driver's operation, online fault detection can be carried out to diesel engine.
To achieve the goals above, the present invention provides a kind of online fault detection methods of diesel engine, in diesel engine song
The flywheel end of axis and free end are respectively provided with flywheel end speed probe and free end speed probe, flywheel end speed probe
It is connect with free end speed probe with controller, this method comprises: the flywheel end speed probe for obtaining real-time measurement generates
The first tach signal and free end speed probe generate the second tach signal；Detect the first tach signal and the second revolving speed
Whether signal jumps；When the first tach signal being not detected and/or the second tach signal jumps, by the first revolving speed
Signal and/or the fault count value of the corresponding crankshaft rotational speed sensor of the second tach signal reinforce definite value；Judge flywheel end crankshaft
Whether the fault count value of speed probe and the fault count value of free end crankshaft rotational speed sensor are more than limits value；If being more than
Limits value then determines the corresponding crankshaft rotational speed sensor of fault count value for failure speed probe.
Wherein, it includes: the first tach signal of detection that whether the first tach signal of detection and the second tach signal, which jump occur,
Whether reach threshold value with the quantity of the orthodont added up before hypodontia in the second tach signal；If reaching threshold value, the first revolving speed letter
Number and/or the second tach signal it is working properly；Otherwise, the first tach signal and/or the work of the second tach signal are abnormal.
Wherein, controller assert the step of corresponding speed probe of fault count value is failure speed probe it
Afterwards, further includes: when diesel engine is in the operation phase, if fault sensor is free end speed probe, judge that free end turns
Whether fast sensor is with speed probe.If free end speed probe is to be switched to flywheel end with speed probe
Speed probe.If failure speed probe is continuing to use the free end and is turning with speed probe to be non-without switching
Fast sensor.When diesel engine is in the operation phase, if fault sensor is flywheel end speed probe, flywheel end revolving speed is judged
Whether sensor is with speed probe.If flywheel end speed probe is to turn with speed probe, being switched to free end
Fast sensor.When failure speed probe be it is non-when with speed probe, without switching, continue to use flywheel end revolving speed biography
Sensor.If failure speed probe is free end speed probe and flywheel end speed probe, flywheel end revolution speed sensing is selected
Device.When diesel engine is in shutdown phase, if fault sensor is that free end speed probe is continued to use without switching
Free end speed probe.When diesel engine is in shutdown phase, if fault sensor is flywheel end speed probe, without
Switching, continues to use flywheel end speed probe.
Wherein, when detecting that the first tach signal and/or the second tach signal jump, will jump first
The failure count of the corresponding flywheel end speed probe of tach signal or the corresponding free end speed probe of the second tach signal
Value is reset.
Wherein, before the step of obtaining the first tach signal and the second tach signal, further includes: judge whether to detect
The start signal of key door enabling signal or vehicle bus；After detecting enabling signal, execute obtain the first tach signal and
The step of second tach signal.
The present invention also provides a kind of online fault detection systems corresponded to the above method, which includes: signal
Module is obtained, the first tach signal and free end revolution speed sensing that the flywheel end speed probe for obtaining real-time measurement generates
The second tach signal that device generates.Signal detection module, for detecting whether the first tach signal and the second tach signal occur
Jump.First computing module, for detecting that the first tach signal and/or the second tach signal do not occur when signal detection module
When jump, by the corresponding flywheel end speed probe of the first tach signal or the corresponding free end revolution speed sensing of the second tach signal
The fault count value of device reinforces definite value.First judgment module, for judge flywheel end speed probe fault count value or from
It whether is more than limits value by the fault count value of end speed probe.Fault determination module, for the judgement based on judgment module
As a result, determining failure speed probe.
Wherein, signal detection module includes: number of teeth amount statistic unit, for detecting the first tach signal or the second revolving speed letter
Whether the quantity of the orthodont added up before hypodontia in number reaches threshold value.Signal determination unit, for when number of teeth amount statistic unit
When statistical result is that the quantity of orthodont reaches threshold value, determine that the first tach signal and/or the second tach signal are working properly.It is no
Then, determine that the first tach signal and/or the work of the second tach signal are abnormal.
Wherein, the system further include: the second judgment module, for when diesel engine is in the operation phase and failure determines mould
When block determines fault sensor for free end speed probe, judge whether free end speed probe is with revolution speed sensing
Device.Switching module, for when the judging result of the second judgment module be free end speed probe be when with speed probe,
It is switched to flywheel end speed probe.Be also used to the judging result when the second judgment module be failure speed probe be it is non-with
Speed probe continues to use free end speed probe without switching.Second judgment module is also used at diesel engine
When the operation phase and when fault determination module determines fault sensor for flywheel end speed probe, judge that flywheel end revolving speed passes
Whether sensor is with speed probe.Switching module is also used to when the judging result of the second judgment module be flywheel end revolving speed
Sensor is to be switched to free end speed probe when with speed probe.It is also used to the judgement knot when the second judgment module
Fruit is that failure speed probe is non-when with speed probe, without switching, continues to use flywheel end speed probe.It cuts
Block is changed the mold, is also used to determine that failure speed probe passes for free end speed probe and flywheel end revolving speed when fault determination module
Sensor selects flywheel end speed probe.Switching module, is also used to when diesel engine is in shutdown phase and fault determination module
Determine that fault sensor is free end speed probe, without switching, continues to use free end speed probe.Switch mould
Block, is also used to when diesel engine is in shutdown phase and fault determination module determines the fault sensor for flywheel end revolving speed biography
When sensor, without switching, flywheel end speed probe is continued to use.
Wherein, the system further include: the second computing module, for when signal detection module detect the first tach signal and
When at least one tach signal in second tach signal jumps, by the corresponding revolution speed sensing of the tach signal jumped
The fault count value of device is reset.
Wherein, system further include: third judgment module detects key door enabling signal or vehicle for judging whether
The start signal of bus.Signal acquisition module, for after the second judgment module detects enabling signal, obtaining the first revolving speed letter
Number and the second tach signal.
A kind of online fault detection method of diesel engine provided by the present invention and corresponding system, do not need shut down with
And in the case where not needing driver's operation, online fault detection can be carried out to diesel engine.Secondly, certainly using speed probe
Body tach signal is judged, the complexity of diagnostic logic is reduced, and is avoided and is led because other sampling sensors go wrong
Cause the generation of wrong diagnosis；It can be realized the fault detection and automatic switchover of flywheel end or free end crankshaft rotational speed sensor, improve
The reliability of monoblock pump diesel engine electric control system, parking phenomenon caused by eliminating because of crankshaft rotational speed sensor.
Detailed description of the invention
Fig. 1 is the online fault detection method flow chart of diesel engine of the invention；
Fig. 2 is diesel engine operation phase signal fault detection method flow chart of the invention；
Fig. 3 is a kind of online test method flow chart after failure speed probe of the invention is assert；
Fig. 4 is another online test method flow chart after failure speed probe of the invention is assert；
Fig. 5 is the startup stage online fault detection method flow chart of specific embodiment of the invention diesel engine；
Fig. 6 is the operation phase online fault detection method flow chart of specific embodiment of the invention diesel engine；
Fig. 7 is the online fault detection method flow chart of shutdown phase of specific embodiment of the invention diesel engine；
Fig. 8 is the flywheel end crankshaft rotational speed sensor and free end song of the online fault detection method of diesel engine of the invention
Shaft speed transducer signal introduces controller schematic diagram；
Fig. 9 is double-crankshaft signals of rotational speed sensor switch logic signal inside programmable logic device (CPLD) of the invention
Figure；
Figure 10 is the module diagram of the online fault detection system of diesel oil provided by the invention.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
Fig. 1 is the flow chart of the online fault detection method of diesel engine provided by the invention.
As shown in Figure 1, the online fault detection method of diesel engine of the invention, in the flywheel end and freedom of crankshaft of diesel engine
End is respectively provided with flywheel end speed probe and free end speed probe, flywheel end speed probe and free end revolution speed sensing
Device is connect with controller, which comprises
Step S100 obtains the first tach signal and free end turn that the flywheel end speed probe of real-time measurement generates
The second tach signal that fast sensor generates.
It should be understood that the flywheel end of diesel engine is arranged in flywheel end speed probe, free end speed probe is set
It sets in the free end of diesel engine, flywheel end speed probe is used to detect the revolving speed of flywheel end and generates the first tach signal, from
It is used to detect the revolving speed of free end by end speed probe and generates the second tach signal.
Step S200, detects the first tach signal and whether the second tach signal jumps.
Step S300, when detecting that at least one tach signal jumps in the first tach signal and the second tach signal
When the fault count value of the corresponding speed probe of the tach signal jumped is reset.
In this step, for example, if only the first tach signal jumps, only by corresponding turn of the first tach signal
The fault count value of fast sensor is reset；It is only that the second tach signal is corresponding if only the second tach signal jumps
Speed probe fault count value reset；If the first tach signal and the second tach signal all jump, by
The fault count value of the corresponding speed probe of one tach signal and the failure meter of the corresponding speed probe of the second tach signal
Numerical value is all reset.
Step S400, when detecting that the first tach signal and/or the second tach signal jump do not occur, by the first revolving speed
The fault count value of the corresponding flywheel end speed probe of signal and/or the corresponding free end speed probe of the second tach signal
Reinforce definite value.In this step, for example, fixed value can be set to 1.When detecting that the first tach signal jump does not occur, then
The fault count value of the corresponding speed probe of first tach signal is added 1；When detecting that the second tach signal do not jump
When, then the fault count value of the corresponding speed probe of the second tach signal is added 1；When detecting that the first tach signal do not occur
Jump and the second tach signal is not when occurring jump yet, then respectively by the failure meter of the corresponding speed probe of the first tach signal
Numerical value add 1 and second the fault count value of the corresponding speed probe of tach signal add 1.
Step S500 judges the failure count of the fault count value and free end speed probe of flywheel end speed probe
Whether value is more than limits value.
In this step, for example, limits value can be set to 2, then judge flywheel end speed probe fault count value and
Whether the fault count value of free end speed probe is more than limits value 2.
Step S600 determines the corresponding speed probe of fault count value for failure revolution speed sensing if being more than limits value
Device.
In this step, for example, if fault count value is set to 3 at this time, and limits value is 2, then determines that fault count value is corresponding
Speed probe be failure speed probe.
Step S700, if being less than limits value, return step S100.
If being less than limits value, determine that the corresponding speed probe of fault count value is not failure speed probe, together
When return step S100.
In this step, for example, if fault count value is set to 1 at this time, and limits value is set to 2, then controller assert failure meter
The corresponding speed probe of numerical value is not failure speed probe, and return step S100 continues to obtain the first tach signal and second
Tach signal.
Fig. 2 is diesel engine operation phase signal fault detection method flow chart of the invention.
As shown in Fig. 2, the operation phase signal fault detection method of diesel engine of the invention further include:
Step S210, detect the orthodont added up before hypodontia in the first tach signal and the second tach signal quantity whether
Reach threshold value.
In this step, for example, if the quantity of the orthodont added up before signal hypodontia is 58, by what is added up before signal hypodontia
The quantity of orthodont is compared with threshold value.
Step S211, if so, the first tach signal and/or the second tach signal are working properly, then it will be working properly
The signal fault count value of the corresponding speed probe of tach signal is reset.
In this step, for example, if the threshold value of the quantity of the orthodont added up before signal hypodontia is set to 58, and before signal hypodontia
The quantity of accumulative orthodont is also 58, illustrates that the quantity of the orthodont added up before signal hypodontia reaches threshold value, then illustrates first
Tach signal and/or the second tach signal are working properly, then by the letter of the corresponding speed probe of the tach signal jumped
Number fault count value is reset.
Step S212, if it is not, then the first tach signal and/or the work of the second tach signal are abnormal, not just by work
The signal fault count value of the corresponding speed probe of normal tach signal reinforces definite value.
In this step, for example, not being if detecting the quantity of the orthodont added up before hypodontia in the first, second tach signal
58, then the first tach signal and/or the work of the second tach signal are abnormal, then will work corresponding turn of abnormal tach signal
The signal fault count value of fast sensor adds 1.
Step S213 judges the failure count of the fault count value and free end speed probe of flywheel end speed probe
Whether value is more than limits value.
In this step, for example, limits value is positioned 3, fault count value or the free end of flywheel end speed probe are judged
Whether the fault count value of speed probe is more than 3.
Step S214, if being more than limits value, controller assert that the corresponding speed probe of fault count value turns for failure
Fast sensor.
In this step, for example, if the fault count value of flywheel end speed probe is 4 at this time, and limits value is 3, then flies
Wheel end speed probe is failure speed probe；If the fault count value of free end speed probe is 4 at this time, free end
Speed probe is failure speed probe.
Step S215, if being less than limits value, controller assert that the corresponding speed probe of fault count value is not event
Hinder speed probe.
In this step, for example, if the fault count value of flywheel end speed probe is 2 at this time, and limits value is 3, then flies
Taking turns end speed probe is not failure speed probe；If the fault count value of free end speed probe is 2 at this time, freely
End speed probe is failure speed probe.
Fig. 3 is a kind of online test method flow chart after failure speed probe of the invention is assert.
As shown in figure 3, assert that the corresponding speed probe of the fault count value is failure speed probe in controller
The step of after, further includes:
Step T601, if fault sensor is free end speed probe, judges institute when diesel engine is in the operation phase
State whether free end speed probe is with speed probe.
It should be noted that when diesel engine is in the operation phase, flywheel end speed probe and free end revolution speed sensing
The revolving speed of device is greater than rotary speed threshold value.
Step T602, if free end speed probe is to be switched to flywheel end speed probe with speed probe.
Step T603, if failure speed probe is continuing to use free end without switching with speed probe to be non-
Speed probe.
Whether step T604 judges flywheel end speed probe if fault sensor is the flywheel end speed probe
For with speed probe.
Step T605, if flywheel end speed probe is to be switched to free end speed probe with speed probe.
Step T606, when failure speed probe be it is non-when with speed probe, without switching, continue to use flywheel
Hold speed probe.
If failure speed probe is free end speed probe and flywheel end speed probe, the flywheel end is selected to turn
Fast sensor.
When the diesel engine is in shutdown phase, it should be noted that when diesel engine is in shutdown phase, fly at this time
The revolving speed for taking turns end speed probe and free end speed probe is less than rotary speed threshold value.At this time regardless of failure speed probe is certainly
By end speed probe and/or flywheel end speed probe, all no longer switch over.
Specifically, if fault sensor is free end speed probe, without switching, free end revolving speed biography is continued to use
Sensor.
If fault sensor be flywheel end speed probe, without switching, continue to use flywheel end speed probe.
The online test method after the identification of failure speed probe can also be carried out according to the following steps, as shown in Figure 4:
Step S601 judges whether failure speed probe is with speed probe.
In this step, for example, judge failure speed probe be for rotate forward the speed probe also right and wrong that use
Speed probe.
Step S602, when failure speed probe be it is non-when with speed probe, continue to use current rotating speed sensor.
In this step, for example, when failure speed probe is not then to continue to use current rotating speed when with speed probe
Sensor.
Step S603 then judges whether the revolving speed of failure speed probe is greater than rotary speed threshold value if with sensor.
In this step, for example, rotary speed threshold value is set to 500 revs/min, if failure speed probe be with sensor,
By the revolving speed and threshold value comparison of failure speed probe.
Step S604 continues to use current revolving speed and passes when the revolving speed of failure speed probe is not more than rotary speed threshold value
Sensor.
It for example, the revolving speed of failure speed probe at this time is 400 revs/min, and is 500 by rotary speed threshold value in this step
Rev/min, then continue to use current speed probe.
Step S605 then judges that failure speed probe turns for flywheel end speed probe or free end if more than threshold value
Fast sensor.
It for example, the revolving speed of failure speed probe at this time is 550 revs/min, and is 500 by rotary speed threshold value in this step
Rev/min, then the revolving speed of failure speed probe is greater than rotary speed threshold value, then further judges that failure speed probe turns for flywheel end
Fast sensor or free end speed probe.
Step S606, when failure speed probe be flywheel end speed probe, then use free end speed probe.
In this step, for example, beginning to use certainly if the sensor to break down at this time is flywheel end speed probe
By end speed probe.
Step S607, when failure speed probe be freewheel end speed probe, then use flywheel end speed probe.
In this step, for example, beginning to use if the sensor to break down at this time is freewheel end speed probe
Fly end speed probe.
Step S608 then uses flywheel when free end speed probe and flywheel end speed probe break down
Hold speed probe.
In this step, for example, being used if free end speed probe and flywheel end speed probe all break down
Flywheel end speed probe.
Fig. 5 is the startup stage online fault detection method flow chart of specific embodiment of the invention diesel engine.
As shown in figure 4, the online fault detection method of diesel engine of the invention, method includes: to obtain in a period of time
The second tach signal that the first tach signal and free end speed probe that flywheel end speed probe generates generate.Detection the
One, whether the second tach signal jumps.It, will when the first tach signal being not detected or the second tach signal jumps
The fault count value of first tach signal or the corresponding speed probe of the second tach signal reinforces definite value.Judge flywheel end revolving speed
Whether the fault count value of sensor or the fault count value of free end speed probe are more than limits value.If being more than limits value,
Then controller assert that the corresponding speed probe of fault count value is failure speed probe.
Wherein, when detecting that at least one tach signal in the first tach signal and the second tach signal jumps
When, the fault count value of the corresponding speed probe of the tach signal jumped is reset.
Wherein, before the step of obtaining the first tach signal and the second tach signal, further includes: judge whether to detect
The start signal of key door enabling signal or vehicle bus.After detecting enabling signal, execute obtain the first tach signal and
The step of second tach signal.Wherein, it when failure speed probe is flywheel end speed probe, is then passed using free end revolving speed
Sensor.When failure speed probe is free end speed probe, then flywheel end speed probe is used.When free end revolving speed
When sensor and flywheel end speed probe break down, then flywheel end speed probe is used.
As shown in figure 5, the embodiment of the online fault detection method as diesel engine of the invention, in diesel engine starting rank
Section, method include:
Whether step Q001, key door or vehicle bus signals receive more than 3s.
In this step, judge that whether controller receives more than 3s key door or vehicle bus signals.
Step Q002, when being not above 3s, starting motor endurance period is too short, does not enter startup stage.
In this step, if the starting time is less than 3s, illustrates that motor endurance period is too short, be equivalent to and do not open
It is dynamic, then do not enter startup stage.
Step Q003 judges whether signal jumps in 200ms when more than 3s.
In this step, if the starting time is more than 3s, judge that controller detects whether that revolving speed can be received in 200ms
The skip signal of sensor.
Step Q004 resets the fault count value that the speed probe of signal jump occurs when signal jumps.
In this step, if the signal of received speed probe jump, the corresponding of signal jump will occur
The fault count value of speed probe is reset.
Step Q005, when signal is there is no jumping, by the failure meter of the speed probe jumped there is no signal
Numerical value adds 1.
In this step, if the signal of received speed probe do not jump, will there is no signals to jump
The fault count value of corresponding speed probe add 1.
Step Q006, whether judge fault count value >=2.
In this step, by the size of the fault count value in step Q005 compared with 2.
Step Q007, as fault count value < 2, then corresponding speed probe is normal.
In this step, if current fault count value less than 2, is 1 or is 0, then illustrate corresponding speed probe
For normal speed probe.
Step Q007 records error code, and press 1 speed-changing sensor of table when fault count value >=2.
In this step, if when current fault count value >=2, recording error code, and switch sensing according to following table 1
Device.
Table 1
The initial value of flywheel end crankshaft rotational speed sensor error code and free end crankshaft rotational speed sensor error code is all zero.
When the initial value of flywheel end crankshaft rotational speed sensor error code and free end crankshaft rotational speed sensor error code is all
When zero, diesel engine selects flywheel end speed probe.
When flywheel end crankshaft rotational speed sensor error code is 0, and free end crankshaft rotational speed sensor error code is 1, diesel oil
Machine selects flywheel end speed probe.
When flywheel end crankshaft rotational speed sensor error code is 1, and free end crankshaft rotational speed sensor error code is 0, diesel oil
Machine selects free end speed probe.
When flywheel end crankshaft rotational speed sensor error code is 1, and free end crankshaft rotational speed sensor error code is 1, diesel oil
Machine selects flywheel end speed probe.
Fig. 6 is the operation phase online fault detection method flow chart of specific embodiment of the invention diesel engine.
As shown in fig. 6, the embodiment of the online fault detection method as diesel engine of the invention, runs rank in diesel engine
Section, method include:
Whether skip signal is detected in step Y001,20ms.
In this step, in diesel engine operation, whether there is skip signal in 20ms internal controller detection speed probe.
Step Y002 then resets the signal deletion count value of corresponding speed probe when detecting skip signal.
In this step, if detecting that skip signal occurs in speed probe in 20ms internal controller, it will go out accordingly
The signal deletion count value of the speed probe of existing signal jump is reset.
Step Y003 then gives the signal deletion count value of corresponding speed probe when not detecting skip signal
Add 1.
It, will accordingly not if speed probe, which is not detected, in 20ms internal controller skip signal occurs in this step
The signal deletion count value for the speed probe of signal jump occur adds 1.
Step Y004, whether signal is 58 at hypodontia.
In this step, the flywheel end of diesel engine and free end sensor export 58 tooth form signals, wherein each tooth form
Signal represents 6 ° of crank angles.The tooth form signal period changes with engine speed, and the period is short when revolving speed is high, otherwise revolving speed is low
Period is long.It is 2 deleted signals after the 58th tooth signal (signal voltage 0 is kept for two tooth form periods).At this point, judgement lacks
Whether the tooth number recorded when tooth is 58.
Step Y005, if so, the signal fault count value of corresponding speed probe is reset.
In this step, if the tooth number recorded when hypodontia is equal to 58, illustrate that corresponding rotation speed sensor signal does not have
It is interfered, is then reset to corresponding speed probe fault count value.
Step Y006, if it is not, the signal fault count value of corresponding speed probe is then added 1.
In this step, if the tooth number recorded when hypodontia be not equal to 58, illustrate corresponding rotation speed sensor signal by
Interference, then add 1 to the signals of rotational speed sensor fault count value.
Step Y007, signal deletion count value or signal fault count value whether >=3.
In this step, by the size of signal deletion count value or signal fault count value compared with 3.
Step Y008, when signal deletion count value or signal fault count value whether < 3 when, then corresponding speed probe
Normally.
In this step, when whether signal deletion count value or signal fault count value are less than 3, when being 0 or 1 or 2, then
It can conclude that corresponding speed probe is normal speed probe.
Step Y009 records error code, and switch by table 1 when signal deletion count value or signal fault count value >=3
Speed probe.
In this step, when signal deletion count value or signal fault count value >=3, then corresponding speed probe be therefore
Hinder speed probe, then records error code, and press the handoff relation speed-changing sensor of table 1.
Fig. 7 is the online fault detection method flow chart of shutdown phase of specific embodiment of the invention diesel engine.
As shown in fig. 7, the embodiment of the online fault detection method as diesel engine of the invention, runs rank in diesel engine
Section, method include:
Whether step T001, revolving speed are greater than 500r/min.
In this step, judge the revolving speed of speed probe is how many, if be greater than 500r/min.
Step T002, if it is not, then diesel engine does not enter shutdown phase also.
In this step, if the revolving speed of speed probe is greater than 500r/min, illustrates that diesel engine is not introduced into and shut down rank
Section, diesel engine is also in the operation phase.
Step T003, if so, whether signal jumps in detection 100ms.
In this step, if the revolving speed of speed probe is less than 500r/min, illustrate that diesel engine comes into shutdown phase,
Then detect whether signals of rotational speed sensor in 100ms jumps.
Step T004 resets corresponding speed probe fault count value if jumping.
In this step, if detecting in 100ms, signals of rotational speed sensor is jumped, and will occur signal jump accordingly
Speed probe fault count value reset.
Corresponding speed probe fault count value is added 1 if not jumping by step T005.
In this step, jumps, will not occur accordingly if being examined in 100ms and not measuring signals of rotational speed sensor
The fault count value of the speed probe of signal jump adds 1.
Step T006, fault count value whether >=4.
In this step, the size of fault count value and 4 is judged.
Step T007, if it is not, then corresponding speed probe is normal.
In this step, if fault count value is not greater than 4, fault count value is 0 or 1 or 2 or 3, then illustrates
Corresponding speed probe is normal speed probe.
Step T008, if so, corresponding speed probe breaks down.
In this step, if fault count value is more than or equal to 4, corresponding speed probe breaks down.
Whether step T009, failure speed probe are with sensor.
In this step, judge the speed probe to break down whether be speed probe.
Step T010, if so, the error code of record corresponding failure speed probe, no longer switches over.
In this step, if the sensor to break down is only to record error code with failure speed probe, no longer carry out
Switching.
Step T011, if it is not, then continuing to use current rotating speed sensor.
In this step, if the sensor to be broken down is non-with speed probe, current revolving speed is continued to use
Sensor.
In shutdown phase, either break down with speed probe or spare speed probe, all without cutting
Operation is changed, error code initial value of the error code for next diesel engine starting when is only recorded and reads use.
Fig. 8 is that the flywheel end speed probe of the online fault detection method of diesel engine of the invention and free end revolving speed pass
Sensor signal introduces controller schematic diagram.
As shown in fig. 7, the online fault detection method of diesel engine of the invention, the input signal packet of Diesel Engine Management System
Include flywheel end speed probe analog signal and free end speed probe analog signal.Flywheel end signals of rotational speed sensor and from
By in the equal input pickup processing circuit of end signals of rotational speed sensor, rectified and amplification is converted into digital signal, and is introduced into
In programmable logic device (CPLD).Microcontroller selects flywheel end crankshaft signal using the logic in I/O triggering CPLD
(Crank1) or free end crankshaft signal (Crank2) with signal as exporting, and another way is as space signal.With signal
Into after microcontroller, time reference is exported as fuel injection signal.And another way signal enters microcontroller as space signal
Only detect.
Fig. 9 is double-crankshaft signals of rotational speed sensor switch logic signal inside programmable logic device (CPLD) of the invention
Figure.
As shown in figure 9, revolving speed switch logic is constituted by combining with door, NOT gate in CPLD, 1 logic, i.e. I/O control are selected for 2
As exporting with signal, switch logic is as shown in table 2 by signal deciding Crank1 or Crank2.Microcontroller only judges spare song
Whether shaft speed transducer signal is normal, to avoid the interruption frequency of spare crankshaft rotational speed sensor signal generation excessively high,
4 frequency counters are added in CPLD to reduce signal frequency, and it is stable to improve program.
Table 2
| I/O signal | With signal | Space signal |
| H | Crank1 | Crank2 |
| L | Crank2 | Crank1 |
Figure 10 is the module diagram of the online fault detection system of diesel oil provided by the invention.
As shown in Figure 10, which includes: signal acquisition module 10, for obtaining the flywheel end revolution speed sensing of real-time measurement
The second tach signal that the first tach signal and free end speed probe that device generates generate.Signal detection module 20, is used for
It detects the first tach signal or whether the second tach signal jumps.First computing module 30, for working as signal detection module
20 when detecting that the first tach signal or the second tach signal do not occur jump, by the corresponding flywheel end revolving speed of the first tach signal
The fault count value of sensor or the corresponding free end speed probe of the second tach signal reinforces definite value.Specifically, fixed value
It can freely set.First judgment module 40, for judging fault count value or the free end of the flywheel end speed probe
Whether the fault count value of speed probe is more than limits value.Fault determination module 50, for based on first judgment module 40
Judging result determines failure speed probe.Specifically, fault determination module 50 is for determining free end speed probe failure
And/or flywheel end speed probe failure.
As shown in Figure 10, signal detection module 20 includes: number of teeth amount statistic unit 21, for detect the first tach signal or
Whether the quantity of the orthodont added up before hypodontia in the second tach signal reaches threshold value.Signal determination unit 22, for working as the number of teeth
When the statistical result of amount statistic unit 21 is that the quantity of orthodont reaches threshold value, first tach signal and/or second are determined
Tach signal is working properly.Otherwise, it is determined that the first tach signal and/or the work of the second tach signal are abnormal.
As shown in Figure 10, the system further include: the second judgment module 41, for when diesel engine is in the operation phase and former
When hindering determining module 50 and determining fault sensor for free end speed probe, judge free end speed probe whether be with
Speed probe.
It is with revolving speed that switching module 60, which is free end speed probe for the judging result when the second judgment module 41,
When sensor, receives and instruct and be switched to flywheel end speed probe.Being also used to the judging result when the second judgment module 41 is
Failure speed probe be it is non-do not switch over speed probe, receiving instruction, continue to use free end revolution speed sensing
Device.
Second judgment module 41, is also used to when diesel engine is in the operation phase and fault determination module 50 determines that failure passes
When sensor is flywheel end speed probe, judge whether flywheel end speed probe is with speed probe.
Switching module 60, it is with turning that be also used to the judging result when the second judgment module 41, which be flywheel end speed probe,
When fast sensor, receives and instruct and be switched to free end speed probe.It is also used to the judging result when the second judgment module 41
It is non-when with speed probe for failure speed probe, receives instruction and do not switch over, continue to use flywheel end revolving speed
Sensor.
Switching module 60 is also used to determine the failure speed probe for free end revolving speed biography when fault determination module 50
Sensor and flywheel end speed probe receive and instruct and select flywheel end speed probe.
Switching module 60, is also used to when diesel engine is in shutdown phase and fault determination module 50 determines fault sensor
For free end speed probe, receives instruction and do not switch over, continue to use free end speed probe；
Switching module 60, is also used to when diesel engine is in shutdown phase and fault determination module 50 determines fault sensor
When for flywheel end speed probe, receives instruction and do not switch over, continue to use flywheel end speed probe.
As shown in Figure 10, the system further include: the second computing module 31, for detecting first when signal detection module 20
When at least one tach signal in tach signal and/or the second tach signal jumps, the tach signal that will jump
The fault count value of corresponding speed probe is reset.
Specifically, if it is free end speed probe that signal, which jumps, by the failure of free end speed probe
Count value is reset, if it is flywheel end speed probe that signal, which jumps, by the failure count of flywheel end speed probe
Value is reset, if the signal of flywheel end speed probe and free end speed probe all jumps, flywheel end revolving speed is passed
The fault count value of sensor and free end speed probe is all reset.
As shown in Figure 10, system further include: third judgment module 42 detects key door starting letter for judging whether
Number or vehicle bus start signal.Signal acquisition module 10, for detecting the enabling signal when third judgment module 42
Afterwards, the first tach signal and the second tach signal are obtained.
As described above, the present invention describes online fault detection method and the corresponding system of this method of a kind of diesel engine in detail
System according to the technical solution of the present invention, can be right in the case where not needing diesel engine stop and not needing driver's operation
Diesel engine carries out online fault detection.According to the technical solution of the present invention, it also avoids exporting by direct measurement sensor
Voltage judges failure, when being changed due to sensor characteristics or null offset occurred, the case where missing inspection occurs.Also avoid
Output voltage is influenced by power-supply system, if power-supply system is unstable, erroneous detection situation occurs.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (8)
1. a kind of online fault detection method of diesel engine, which is characterized in that the described method includes:
What the first tach signal and free end speed probe for obtaining the flywheel end speed probe generation of real-time measurement generated
Second tach signal；
It detects first tach signal and whether the second tach signal jumps；Detection first tach signal and second
Whether tach signal there is jump
Whether the quantity for detecting the orthodont added up before hypodontia in first tach signal and the second tach signal reaches threshold value；
If so, determining that first tach signal and/or the second tach signal are working properly；
Otherwise, it is determined that first tach signal and/or the work of the second tach signal are abnormal；
When detecting that first tach signal and/or the second tach signal jump do not occur, by first tach signal
The fault count value of corresponding flywheel end speed probe or the corresponding free end speed probe of the second tach signal is fixed
Value；
Whether the fault count value of the fault count value and free end speed probe that judge flywheel end speed probe is more than limit
Value processed；
If being more than limits value, determine the corresponding speed probe of the fault count value for failure speed probe.
2. according to the method described in claim 1, being event in the corresponding speed probe of described judgement fault count value wherein
After the step of hindering speed probe, further includes:
When the diesel engine is in the operation phase, if the failure speed probe is the free end speed probe, sentence
Whether the free end speed probe that breaks is with speed probe；
If the free end speed probe is to be switched to the flywheel end speed probe with speed probe；If described
Failure speed probe is continuing to use the free end speed probe without switching with speed probe to be non-；
When the diesel engine is in the operation phase, if the failure speed probe is the flywheel end speed probe, sentence
Whether the flywheel end speed probe that breaks is with speed probe:
If the flywheel end speed probe is to be switched to the free end speed probe with speed probe；When described
Failure speed probe be it is non-when with speed probe, without switching, continue to use the flywheel end speed probe；
If the failure speed probe is the free end speed probe and the flywheel end speed probe, described in selection
Flywheel end speed probe；
When the diesel engine is in shutdown phase, if the failure speed probe is the free end speed probe, no
It switches over, continues to use the free end speed probe；
When the diesel engine is in shutdown phase, if the failure speed probe is the flywheel end speed probe, no
It switches over, continues to use the flywheel end speed probe.
3. according to the method described in claim 1, wherein, when detecting first tach signal and/or the second tach signal
When jumping, the corresponding flywheel end speed probe of first tach signal jumped or the second revolving speed are believed
The fault count value of number corresponding free end speed probe is reset.
4. method according to any one of claim 1-3, wherein in the first tach signal of the acquisition and the second revolving speed
Before the step of signal, further includes:
Judge whether to detect the start signal of key door enabling signal or vehicle bus；
After detecting the enabling signal, the first tach signal of the acquisition is executed and the step of the second tach signal.
5. a kind of online fault detection system of diesel engine, which is characterized in that the system comprises:
Signal acquisition module (10), for obtain real-time measurement flywheel end speed probe generate the first tach signal and from
The second tach signal generated by end speed probe；
Signal detection module (20), for detecting whether first tach signal and the second tach signal jump；
The signal detection module (20) includes: number of teeth amount statistic unit (21) and signal determination unit (22)；
The number of teeth amount statistic unit (21) adds up before hypodontia for detecting in first tach signal and the second tach signal
The quantity of orthodont whether reach threshold value；
The signal determination unit (22) reaches for the quantity that the statistical result when number of teeth amount statistic unit (21) is orthodont
When threshold value, determine that first tach signal and/or the second tach signal are working properly；Otherwise, it is determined that the first revolving speed letter
Number and/or the second tach signal work it is abnormal；
First computing module (30), for detecting first tach signal and/or second turn when signal detection module (20)
When fast signal does not occur jump, by the corresponding flywheel end speed probe of first tach signal or second tach signal
The fault count value of corresponding free end speed probe reinforces definite value；
First judgment module (40), for judging the fault count value or free end revolution speed sensing of the flywheel end speed probe
Whether the fault count value of device is more than limits value；
Fault determination module (50) determines failure revolution speed sensing for the judging result based on the first judgment module (40)
Device.
6. system according to claim 5, wherein the system also includes:
Second judgment module (41), is used for when the diesel engine is in the operation phase and the fault determination module (50) determines
When the failure speed probe is free end speed probe, judge whether the free end speed probe is with revolving speed
Sensor；
Switching module (60), for when the second judgment module (41) judging result be the free end speed probe be with
When speed probe, it is switched to the flywheel end speed probe；It is also used to the judgement knot when second judgment module (41)
Fruit is that the failure speed probe is non-with speed probe, without switching, is continuing to use the free end revolving speed and is passing
Sensor；
Second judgment module (41), is also used to when the diesel engine is in the operation phase and the fault determination module
(50) when determining the failure speed probe for flywheel end speed probe, judge the flywheel end speed probe whether be
With speed probe；
The switching module (60) is also used to when the judging result of the second judgment module (41) be the flywheel end speed probe
When with speed probe, to be switched to the free end speed probe；It is also used to the judgement when the second judgment module (41)
As a result it is non-when with speed probe for the failure speed probe, without switching, continues to use flywheel end revolving speed biography
Sensor；
The switching module (60) is also used to determine that the failure speed probe turns for free end when fault determination module (50)
Fast sensor and flywheel end speed probe select the flywheel end speed probe；
The switching module (60), is also used to when the diesel engine is in shutdown phase and the fault determination module (50) is sentenced
The failure speed probe is determined for free end speed probe, without switching, continues to use free end speed probe；
The switching module (60), is also used to when the diesel engine is in shutdown phase and the fault determination module (50) is sentenced
When the fixed failure speed probe is flywheel end speed probe, without switching, continues to use the flywheel end revolving speed and pass
Sensor.
7. system according to claim 5, wherein the system also includes:
Second computing module (31), for detecting first tach signal and/or second turn when signal detection module (20)
When fast signal jumps, by the corresponding flywheel end speed probe of first tach signal jumped or second
The fault count value of the corresponding free end speed probe of tach signal is reset.
8. the system according to any one of claim 5-7, wherein the system also includes:
Third judgment module (42), for judging whether to detect the start signal of key door enabling signal or vehicle bus；
The signal acquisition module (10), for obtaining after the third judgment module (42) detects the enabling signal
First tach signal and second tach signal.
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| CN111366370A (en) * | 2020-04-15 | 2020-07-03 | 东风汽车集团有限公司 | Engine fault injection method and system |
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| CN110397512A (en) * | 2019-07-29 | 2019-11-01 | 壹站科技服务(武汉)有限公司 | A kind of diesel electric-controlled management system |
| CN111255566B (en) * | 2020-05-06 | 2020-09-25 | 南京金城机械有限公司 | System and method for acquiring rotating speed signal of magnetoelectric double-trigger electronic injection engine |
| CN115142974A (en) * | 2021-08-31 | 2022-10-04 | 徐州汉凯汽车科技有限公司 | Engine operation control method and control system |
| CN113791239A (en) * | 2021-09-01 | 2021-12-14 | 哈尔滨工程大学 | Diesel engine rotating speed signal preamplification device |
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