CN106382165A - On-line fault detection method and system for diesel engine - Google Patents
On-line fault detection method and system for diesel engine Download PDFInfo
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- CN106382165A CN106382165A CN201611060445.4A CN201611060445A CN106382165A CN 106382165 A CN106382165 A CN 106382165A CN 201611060445 A CN201611060445 A CN 201611060445A CN 106382165 A CN106382165 A CN 106382165A
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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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Abstract
The invention discloses an on-line fault detection method and system for a diesel engine. The on-line fault detection method comprises the following steps of obtaining a first rotating speed signal and a second rotating speed signal, which are measured in a real-time manner, wherein the first rotating speed signal is generated by a flywheel end rotating speed sensor, and the second rotating speed signal is generated by a free end rotating speed sensor; detecting whether the first rotating speed signal and the second rotating speed signal jump or not; when the condition that the first rotating speed signal and/or the second rotating speed signal do/does not jump is detected, adding the fault count values/a fault count value of the flywheel end rotating speed sensor corresponding to the first rotating speed signal and/or the free end rotating speed sensor corresponding to the second rotating speed signal and a fixed value; judging whether the fault count value of the flywheel end rotating speed sensor and the fault count value of the free end rotating speed sensor exceed the limit value or not; and if the fault count values exceed the limit value, judging the rotating speed sensors corresponding to the fault count values as fault rotating speed sensors. Under the conditions that the diesel engine does not need to be stopped and an operator is not needed, on-line fault detection of the diesel engine is achieved by detecting whether jump signals exist in the rotating speed signals or not in a real-time manner.
Description
Technical field
The present invention relates to electronic Control for Diesel Engine field, the online fault detection method particularly to a kind of diesel engine and be
System.
Background technology
Crankshaft rotational speed sensor is the vitals 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.Whether normal crankshaft rotational speed sensor is, and speed of crankshaft
The quality of signal, has a strong impact on engine power performance, economy and discharge, declines in dropout or serious unfavorable condition
Will result in diesel engine stop.
In existing diesel electric-controlled system fault diagnostic techniques, the voltage that diesel engine is exported by direct measurement sensor
Carry out failure judgement.When output voltage exceedes the maximum magnitude of controller setting, that is, judge sensor experiences failure.
There is shortcoming in prior art：
Shortcoming 1：Not accurate enough by voltage failure judgement, for example, when sensor characteristics changes or zero point
During drift, existing detection method cannot detect the system failure of diesel engine, missing inspection easily.
Shortcoming 2：The voltage of output is affected by power-supply system, if power-supply system is unstable, existing detection method easily occurs
Flase drop.
Based on the problems referred to above, technical scheme is proposed.The present invention is not needing to shut down and is not needing driver
In the case of operation, propose a kind of succinct, fast and effectively diesel engine online fault detection method, electric-control system can be improved
Stability and reliability.
Content of the invention
It is an object of the invention to provide a kind of online fault detection method of diesel engine, by technical scheme,
In the case of not needing diesel engine stop and not needing operator, online fault detect can be carried out to diesel engine.
To achieve these goals, the invention provides a kind of online fault detection method of diesel engine, bent in diesel engine
The flywheel end of axle and free end are respectively provided with flywheel end speed probe and free end speed probe, flywheel end speed probe
It is connected with controller with free end speed probe, the method includes：The flywheel end speed probe obtaining measurement in real time produces
The first tach signal and free end speed probe produce the second tach signal；Detect the first tach signal and the second rotating speed
Whether signal saltus step；When being not detected by the first tach signal and/or the second tach signal saltus step, by the first rotating speed
The fault count value of signal and/or the corresponding crankshaft rotational speed sensor of the second tach signal reinforces definite value；Judge flywheel end bent axle
Whether the fault count value of the fault count value of speed probe and free end crankshaft rotational speed sensor exceedes limits value；If exceeding
Limits value, then judge the corresponding crankshaft rotational speed sensor of fault count value as fault speed probe.
Wherein, whether detection the first tach signal and the second tach signal saltus step and include：Detect the first tach signal
Whether reach threshold value with the quantity of accumulative orthodont before hypodontia in the second tach signal；If reaching threshold value, the first rotating speed letter
Number and/or the second tach signal working properly；Otherwise, the first tach signal and/or the work of the second tach signal are abnormal.
Wherein, controller assert the corresponding speed probe of fault count value be fault speed probe step it
Afterwards, also include：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 with speed probe, switch to flywheel end
Speed probe.If fault speed probe does not switch over speed probe for non-, it is continuing with described free end and turns
Fast sensor.When diesel engine is in the operation phase, if fault sensor is flywheel end speed probe, judge flywheel end rotating speed
Whether sensor is with speed probe.If flywheel end speed probe is with speed probe, free end is switched to turn
Fast sensor.When fault speed probe does not switch over when using speed probe for non-, it is continuing with flywheel end rotating speed and passes
Sensor.If fault speed probe is free end speed probe and flywheel end speed probe, select flywheel end revolution speed sensing
Device.When diesel engine is in the shutdown stage, if fault sensor is free end speed probe, does not switch over, be continuing with
Free end speed probe.When diesel engine is in the shutdown stage, if fault sensor is flywheel end speed probe, do not carry out
Switching, is continuing with flywheel end speed probe.
Wherein, when the first tach signal is detected and/or the second tach signal saltus step, the first of saltus step will be occurred
Tach signal corresponding flywheel end speed probe or the failure count of the second tach signal corresponding free end speed probe
Value resets.
Wherein, before obtaining the step of the first tach signal and the second tach signal, also include：Judge whether to detect
Key door enabling signal or the start signal of car load bus；After enabling signal is detected, execution obtain the first tach signal and
The step of the second tach signal.
Present invention also offers a kind of online fault detection system corresponding with said method, this system includes：Signal
Acquisition module, the first tach signal and free end revolution speed sensing that the flywheel end speed probe for obtaining real-time measurement produces
The second tach signal that device produces.Signal detection module, for detecting whether the first tach signal and the second tach signal occur
Saltus step.First computing module, for detecting the first tach signal and/or the second tach signal does not occur when signal detection module
During saltus step, by corresponding for the first tach signal flywheel end speed probe or the second tach signal corresponding free end revolution speed sensing
The fault count value of device reinforces definite value.First judge module, for judge flywheel end speed probe fault count value or from
Whether limits value is exceeded by the fault count value of end speed probe.Fault determination module, for the judgement based on judge module
As a result, determine fault speed probe.
Wherein, signal detection module includes：Number of teeth amount statistic unit, for detecting the first tach signal or the second rotating speed letter
Before hypodontia in number, whether the quantity of accumulative orthodont reaches threshold value.Signal determining unit, for when number of teeth amount statistic unit
When statistics reaches threshold value for the quantity of orthodont, judge that the first tach signal and/or the second tach signal are working properly.No
Then, judge that the first tach signal and/or the work of the second tach signal are abnormal.
Wherein, this system also includes：Second judge module, for when diesel engine is in the operation phase and fault determines mould
When block judges fault sensor as free end speed probe, judge that whether free end speed probe is with revolution speed sensing
Device.Handover module, is when using speed probe for the judged result when the second judge module for free end speed probe,
Switch to flywheel end speed probe.Be additionally operable to when the second judge module judged result be fault speed probe for non-with
Speed probe, does not switch over, and is continuing with free end speed probe.Second judge module, is additionally operable at diesel engine
When the operation phase and when fault determination module judges fault sensor as flywheel end speed probe, judge that flywheel end rotating speed passes
Whether sensor is with speed probe.Handover module, being additionally operable to when the judged result of the second judge module is flywheel end rotating speed
Sensor is when using speed probe, switches to free end speed probe.It is additionally operable to the judgement knot when the second judge module
Fruit does not switch over when using speed probe for non-for fault speed probe, is continuing with flywheel end speed probe.Cut
Die change block, is additionally operable to judge that fault speed probe is free end speed probe and flywheel end rotating speed passes when fault determination module
Sensor, selects flywheel end speed probe.Handover module, is additionally operable to when diesel engine is in the shutdown stage and fault determination module
Judge that fault sensor, as free end speed probe, does not switch over, is continuing with free end speed probe.Switching mould
Block, is additionally operable to when diesel engine is in the shutdown stage and fault determination module judges that described fault sensor passes as flywheel end rotating speed
During sensor, do not switch over, be continuing with flywheel end speed probe.
Wherein, this system also includes：Second computing module, for when signal detection module detect the first tach signal and
When saltus step at least one of second tach signal tach signal, the corresponding revolution speed sensing of tach signal of saltus step will be there is
The fault count value of device resets.
Wherein, this system also includes：3rd judge module, is used for judging whether key door enabling signal or car load is detected
The start signal of bus.Signal acquisition module, for after the second judge module detects enabling signal, obtaining the first rotating 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 of not needing operator, online fault detect can be carried out to diesel engine.Secondly, using speed probe certainly
Body tach signal is judged, reduces the complexity of diagnostic logic, it is to avoid lead because other sampling sensors go wrong
Cause the generation of wrong diagnosis；It is capable of fault detect and the automatic switchover of flywheel end or free end crankshaft rotational speed sensor, improve
The reliability of monoblock pump diesel engine electric control system, eliminates the parking phenomenon leading to because of crankshaft rotational speed sensor.
Brief description
Fig. 1 is the diesel engine online fault detection method flow chart of the present invention；
Fig. 2 is the diesel engine operation phase signal fault detection method flow chart of the present invention；
Fig. 3 is a kind of online test method flow chart after the fault speed probe identification of the present invention；
Fig. 4 is another kind of online test method flow chart after the fault speed probe identification of the present invention；
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 shutdown stage online fault detection method flow chart of specific embodiment of the invention diesel engine；
Fig. 8 is that the flywheel end crankshaft rotational speed sensor of the online fault detection method of the diesel engine of the present invention is bent with free end
Shaft speed transducer signal introduces controller schematic diagram；
Fig. 9 is that the internal double-crankshaft signals of rotational speed sensor switch logic of programmable logic device (CPLD) of the present invention is illustrated
Figure；
Figure 10 is the module diagram of the online fault detection system of diesel oil that the present invention provides.
Specific embodiment
For making the object, technical solutions and advantages of the present invention of greater clarity, with reference to specific embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are simply exemplary, and it is not intended to limit this
Bright scope.Additionally, in the following description, eliminate the description to known features and technology, to avoid unnecessarily obscuring this
The concept of invention.
Fig. 1 is the flow chart of the online fault detection method of diesel engine that the present invention provides.
As shown in figure 1, the online fault detection method of the diesel engine of the present invention, in flywheel end and the 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 connected with controller, and methods described includes：
Step S100, obtains the first tach signal and the free end rotating speed that the flywheel end speed probe of measurement in real time produces
The second tach signal that sensor produces.
It should be noted that：Flywheel end speed probe is arranged on the flywheel end of diesel engine, and free end speed probe sets
Put the free end in diesel engine, flywheel end speed probe is used for detecting the rotating speed of flywheel end and producing the first tach signal, from
It is used for detecting the rotating speed of free end and producing the second tach signal by end speed probe.
Whether step S200, detection the first tach signal and the second tach signal saltus step.
, saltus step when at least one tach signal in the first tach signal and the second tach signal is detected in step S300
When will occur saltus step the corresponding speed probe of tach signal fault count value reset.
In this step, for example, if saltus step in the only first tach signal, only by corresponding for the first tach signal turn
The fault count value of fast sensor resets；If saltus step in the only second tach signal, only the second tach signal is corresponded to
Speed probe fault count value reset；If saltus step all in the first tach signal and the second tach signal, by
The fault count value of the corresponding speed probe of one tach signal and the fault meter of the corresponding speed probe of the second tach signal
Numerical value all resets.
Step S400, when the first tach signal is detected and/or the second tach signal saltus step, by the first rotating speed
Signal corresponding flywheel end speed probe and/or the fault count value of the second tach signal corresponding free end speed probe
Reinforce definite value.In this step, for example, it is possible to fixed value is set to 1.When the first tach signal is detected saltus step not occurring, then
The fault count value of corresponding for the first tach signal speed probe is added 1；When the second tach signal is detected, saltus step does not occur
When, then the fault count value of corresponding for the second tach signal speed probe is added 1；Do not occur when the first tach signal is detected
Saltus step and when the second tach signal saltus step yet, then respectively by the fault meter of corresponding for the first tach signal speed probe
Numerical value adds 1 and the fault count value of the corresponding speed probe of the second tach signal adds 1.
Step S500, judges the fault count value of flywheel end speed probe and the failure count of free end speed probe
Whether value exceedes limits value.
In this step, for example, it is possible to limits value is set to 2, then judge flywheel end speed probe fault count value and
Whether the fault count value of free end speed probe exceedes limits value 2.
Step S600, if exceeding limits value, judges the corresponding speed probe of fault count value as fault revolution speed sensing
Device.
In this step, for example, if now fault count value is set to 3, and limits value is 2, then judge that fault count value corresponds to
Speed probe be fault speed probe.
Step S700, if not less than limits value, return to step S100.
If not less than limits value, judge that the corresponding speed probe of fault count value is not fault speed probe, with
When return to step S100.
In this step, for example, if now fault count value is set to 1, and limits value is set to 2, then fault meter assert by controller
The corresponding speed probe of numerical value is not fault speed probe, and return to step S100 continues to obtain the first tach signal and second
Tach signal.
Fig. 2 is the diesel engine operation phase signal fault detection method flow chart of the present invention.
As shown in Fig. 2 the operation phase signal fault detection method of the diesel engine of the present invention also includes：
Step S210, before hypodontia in detection the first tach signal and the second tach signal, whether the quantity of accumulative orthodont
Reach threshold value.
In this step, for example, if the quantity of accumulative orthodont before signal hypodontia is 58, by add up before signal hypodontia
The quantity of orthodont and threshold value are compared.
Step S211, if so, then the first tach signal and/or the second tach signal are working properly, then will be working properly
The signal fault count value of the corresponding speed probe of tach signal resets.
In this step, for example, if the threshold value of the accumulative quantity of orthodont before signal hypodontia is set to 58, and before signal hypodontia
The quantity of accumulative orthodont is also 58, and before signal hypodontia is described, the quantity of accumulative orthodont reaches threshold value, then illustrate first
Tach signal and/or the second tach signal are working properly, then the letter of the corresponding speed probe of tach signal of saltus step will occur
Number fault count value resets.
Step S212, if it is not, then the first tach signal and/or the work of the second tach signal are abnormal, by work not just
The signal fault count value of the corresponding speed probe of normal tach signal reinforces definite value.
In this step, for example, if the quantity of accumulative orthodont before hypodontia in first, second tach signal is detected is not
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 fault count value of flywheel end speed probe and the failure count of free end speed probe
Whether value exceedes limits value.
In this step, for example, limits value is positioned 3, judge fault count value or the free end of flywheel end speed probe
Whether the fault count value of speed probe is more than 3.
Step S214, if exceeding limits value, controller assert that the corresponding speed probe of fault count value turns for fault
Fast sensor.
In this step, for example, if now the fault count value of flywheel end speed probe is 4, and limits value is 3, then fly
Wheel end speed probe is fault speed probe；If now the fault count value of free end speed probe is 4, free end
Speed probe is fault speed probe.
Step S215, if not less than limits value, controller assert that the corresponding speed probe of fault count value is not event
Barrier speed probe.
In this step, for example, if now the fault count value of flywheel end speed probe is 2, and limits value is 3, then fly
Wheel end speed probe is not fault speed probe；If now the fault count value of free end speed probe is 2, freely
End speed probe is fault speed probe.
Fig. 3 is a kind of online test method flow chart after the fault speed probe identification of the present invention.
As shown in figure 3, assert that the corresponding speed probe of described fault count value is fault speed probe in controller
Step after, also include：
Step T601, when diesel engine is in the operation phase, if fault sensor is free end speed probe, judges institute
Whether state 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 rotating speed of device is more than rotary speed threshold value.
Step T602, if free end speed probe is with speed probe, switches to flywheel end speed probe.
Step T603, if fault speed probe be non-with speed probe, do not switch over, be continuing with free end
Speed probe.
Whether step T604, if fault sensor is described flywheel end speed probe, judge flywheel end speed probe
It is with speed probe.
Step T605, if flywheel end speed probe is with speed probe, switches to free end speed probe.
Step T606, when fault speed probe does not switch over when using speed probe for non-, is continuing with flywheel
End speed probe.
If fault speed probe is free end speed probe and flywheel end speed probe, described flywheel end is selected to turn
Fast sensor.
When described diesel engine is in the shutdown stage, it should be noted that when diesel engine is in the shutdown stage, now flying
The rotating speed of wheel end speed probe and free end speed probe is less than rotary speed threshold value.Now no matter fault 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, do not switch over, be continuing with free end rotating speed and pass
Sensor.
If fault sensor is flywheel end speed probe, does not switch over, be continuing with flywheel end speed probe.
Online test method after fault speed probe identification can also be carried out according to the following step, as shown in Figure 4：
Step S601, whether failure judgement speed probe is with speed probe.
In this step, for example, failure judgement speed probe be for rotate forward use speed probe also right and wrong
Speed probe.
Step S602, when fault speed probe be non-when using speed probe, be continuing with current speed probe.
In this step, for example, when fault speed probe is not when using speed probe, then it is continuing with current rotating speed
Sensor.
Step S603, if with sensor, then whether the rotating speed of failure judgement speed probe is more than rotary speed threshold value.
In this step, for example, rotary speed threshold value is set to 500 revs/min, if fault speed probe is with sensor,
The rotating speed of fault speed probe is compared with threshold value.
Step S604, when the rotating speed of fault speed probe is not more than rotary speed threshold value, is continuing with current rotating speed and passes
Sensor.
In this step, for example, the rotating speed of fault speed probe now is 400 revs/min, and rotary speed threshold value is 500
Rev/min, then it is continuing with current speed probe.
Step S605, if being more than threshold value, failure judgement speed probe is flywheel end speed probe or free end turns
Fast sensor.
In this step, for example, the rotating speed of fault speed probe now is 550 revs/min, and rotary speed threshold value is 500
Rev/min, then the rotating speed of fault speed probe is more than rotary speed threshold value, then determine whether that fault speed probe turns for flywheel end
Fast sensor or free end speed probe.
Step S606, when fault speed probe is flywheel end speed probe, then using free end speed probe.
In this step, for example, if the sensor now breaking down is flywheel end speed probe, begin to use certainly
By end speed probe.
Step S607, when fault speed probe is freewheel end speed probe, then using flywheel end speed probe.
In this step, for example, if the sensor now breaking down is freewheel end speed probe, begin to use
Fly end speed probe.
Step S608, when free end speed probe and flywheel end speed probe all break down, then using flywheel
End speed probe.
In this step, for example, if free end speed probe and flywheel end speed probe all break down, use
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 the diesel engine of the present invention, method includes：Obtain in a period of time
The first tach signal and the second tach signal of free end speed probe generation that flywheel end speed probe produces.Detection the
First, whether the second tach signal saltus step.When being not detected by the first tach signal or the second tach signal saltus step, will
The fault count value of the first tach signal or the corresponding speed probe of the second tach signal reinforces definite value.Judge flywheel end rotating speed
Whether the fault count value of the fault count value of sensor or free end speed probe exceedes limits value.If exceeding limits value,
Then controller assert that the corresponding speed probe of fault count value is fault speed probe.
Wherein, saltus step occurs when at least one of the first tach signal and the second tach signal tach signal is detected
When, the fault count value that the corresponding speed probe of tach signal of saltus step occurs is reset.
Wherein, before obtaining the step of the first tach signal and the second tach signal, also include：Judge whether to detect
Key door enabling signal or the start signal of car load bus.After enabling signal is detected, execution obtain the first tach signal and
The step of the second tach signal.Wherein, when fault speed probe is flywheel end speed probe, then passed using free end rotating speed
Sensor.When fault speed probe is free end speed probe, then using flywheel end speed probe.When free end rotating speed
When sensor and flywheel end speed probe all break down, then using flywheel end speed probe.
As shown in figure 5, the embodiment of the online fault detection method as the diesel engine of the present invention, in diesel engine starting rank
Section, method includes：
Whether step Q001, key door or car load bus signals receive more than 3s.
In this step, judge that whether controller receives more than 3s to key door or car load bus signals.
Step Q002, when being not above 3s, startup motor endurance period is too short, is introduced into startup stage.
In this step, if starting time is not less than 3s, illustrates that motor endurance period is too short, be equivalent to and do not open
Dynamic, then it is introduced into startup stage.
Step Q003, when more than 3s, judges in 200ms signal whether saltus step.
In this step, if starting time is more than 3s, judge that controller detects whether to receive rotating speed in 200ms
The skip signal of sensor.
Step Q004, when signal occurs saltus step, the fault count value that the speed probe of signal saltus step occurs is reset.
In this step, if saltus step in the signal of the speed probe being received, the corresponding of signal saltus step will be there is
The fault count value of speed probe resets.
, when signal does not occur saltus step, be there is not the fault meter of the speed probe of signal saltus step in step Q005
Numerical value adds 1.
In this step, if the signal of the speed probe being received saltus step, signal saltus step will not occur
The fault count value of corresponding speed probe add 1.
Step Q006, failure judgement count value whether >=2.
In this step, the size of the fault count value in step Q005 is compared with 2.
Step Q007, as fault count value ＜ 2, then corresponding speed probe is normal.
In this step, if current fault count value is less than 2, when being 1 or being 0, then corresponding speed probe is described
For rated speed sensor.
Step Q007, when fault count value >=2, records DTC, and presses table 1 speed-changing sensor.
In this step, if during current fault count value >=2, record DTC, and switch sensing according to table 1 below
Device.
Table 1
The initial value of flywheel end crankshaft rotational speed sensor DTC and free end crankshaft rotational speed sensor DTC is all zero.
When the initial value of flywheel end crankshaft rotational speed sensor DTC and free end crankshaft rotational speed sensor DTC is all
When zero, diesel engine selects flywheel end speed probe.
When flywheel end crankshaft rotational speed sensor DTC is 0, and free end crankshaft rotational speed sensor DTC is 1, diesel oil
Machine selects flywheel end speed probe.
When flywheel end crankshaft rotational speed sensor DTC is 1, and free end crankshaft rotational speed sensor DTC is 0, diesel oil
Machine selects free end speed probe.
When flywheel end crankshaft rotational speed sensor DTC is 1, and free end crankshaft rotational speed sensor DTC 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 the diesel engine of the present invention, run rank in diesel engine
Section, method includes：
Whether skip signal is detected in step Y001,20ms.
In this step, when diesel engine runs, whether skip signal occurs in 20ms internal controller detection speed probe.
The signal deletion count value of corresponding speed probe when skip signal is detected, is then reset by step Y002.
In this step, if speed probe is detected in 20ms internal controller to occur in that skip signal, gone out accordingly
The signal deletion count value of the speed probe of existing signal saltus step resets.
Step Y003, when being not detected by skip signal, then gives the signal deletion count value of corresponding speed probe
Plus 1.
In this step, if being not detected by speed probe in 20ms internal controller skip signal occurs, will accordingly not
The signal deletion count value speed probe of signal saltus step adds 1.
Step Y004, at hypodontia, whether signal is 58.
In this step, the flywheel end of diesel engine and free end sensor all export 58 profile of tooth signals, wherein each profile of tooth
Signal represents 6 ° of crank angles.This profile of tooth signal period changes with engine speed, cycle is short when rotating speed is high, otherwise when rotating speed is low
Cycle is long.After the 58th tooth signal, it is 2 deleted signal (signal voltage is 0, keeps two profile of tooth cycles).Now, judge to lack
Whether the tooth number recording during tooth is 58.
If so, the signal fault count value of corresponding speed probe is then reset by step Y005.
In this step, if the tooth number recording during hypodontia is equal to 58, illustrate that corresponding rotation speed sensor signal does not have
It is interfered, then reset to corresponding speed probe fault count value.
Step Y006, if it is not, then add 1 by the signal fault count value of corresponding speed probe.
In this step, if the tooth number recording during hypodontia is not equal to 58, illustrate that corresponding rotation speed sensor signal is subject to
Interference, then add 1 to this signals of rotational speed sensor fault count value.
Step Y007, signal deletion count value or signal fault count value whether >=3.
In this step, the size of signal deletion count value or signal fault count value is compared with 3.
Step Y008, as signal deletion count value or signal fault count value whether ＜ 3, 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
Can conclude that corresponding speed probe is rated speed sensor.
Step Y009, when signal deletion count value or signal fault count value >=3, records DTC, and switches by table 1
Speed probe.
In this step, when signal deletion count value or signal fault count value >=3, then corresponding speed probe is event
Barrier speed probe, then record DTC, and press the handoff relation speed-changing sensor of table 1.
Fig. 7 is the shutdown stage online fault detection method flow chart of specific embodiment of the invention diesel engine.
As shown in fig. 7, the embodiment of the online fault detection method as the diesel engine of the present invention, run rank in diesel engine
Section, method includes：
Step T001, whether rotating speed is more than 500r/min.
In this step, judge that the rotating speed of speed probe is how many, if more than 500r/min.
Step T002, if it is not, then diesel engine is also introduced into the shutdown stage.
In this step, if the rotating speed of speed probe is more than 500r/min, illustrate that diesel engine is not introduced into shutting down rank
Section, diesel engine is also in the operation phase.
Step T003, if so, then signal whether saltus step in detection 100ms.
In this step, if the rotating speed of speed probe is less than 500r/min, illustrate that diesel engine comes into the shutdown stage,
Then signals of rotational speed sensor whether saltus step in detection 100ms.
Step T004, if saltus step, corresponding speed probe fault count value is reset.
In this step, if signals of rotational speed sensor is detected in 100ms saltus step occurs, signal saltus step is occurred accordingly
Speed probe fault count value reset.
Step T005, if saltus step, corresponding speed probe fault count value is added 1.
In this step, if inspection does not measure signals of rotational speed sensor and saltus step in 100ms, will not occur accordingly
The fault count value of the speed probe of signal saltus step adds 1.
Step T006, fault count value whether >=4.
In this step, failure judgement count value and 4 size.
Step T007, if it is not, then corresponding speed probe is normal.
In this step, if fault count value is not more than 4, fault count value is 0 or 1 or 2 or 3, then illustrate
Corresponding speed probe is rated speed sensor.
Step T008, if so, then corresponding speed probe breaks down.
In this step, if fault count value is more than or equal to 4, corresponding speed probe breaks down.
Step T009, whether fault speed probe is with sensor.
In this step, judge the speed probe that breaks down be whether speed probe.
Step T010, if so, then records the DTC of corresponding failure speed probe, no longer switches over.
In this step, if the sensor breaking down is to use fault speed probe, only record DTC, is no longer carried out
Switching.
Step T011, if it is not, be then continuing with current speed probe.
In this step, if the sensor being broken down be non-with speed probe, be continuing with current rotating speed
Sensor.
In the stage of shutdown, either broken down with speed probe or standby speed probe, do not cut
Change operation, only record DTC reads for DTC initial value during next diesel engine starting and uses.
Fig. 8 is that the flywheel end speed probe of the online fault detection method of the diesel engine of the present invention is passed with free end rotating speed
Sensor signal introduces controller schematic diagram.
As shown in fig. 7, the online fault detection method of the diesel engine of the present invention, the input signal bag 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 signals of rotational speed sensor equal input pickup process circuit of end, rectified and amplification is converted into data signal, and is incorporated into
In PLD (CPLD).Microcontroller utilizes I/O to trigger the logic in CPLD, selects flywheel end crankshaft signal
(Crank1) or free end crankshaft signal (Crank2) is as with signal output, another road is as space signal.With signal
After entering microcontroller, as fuel injection signal output time benchmark.And another road signal enters microcontroller as space signal
Only detect.
Fig. 9 is that the internal double-crankshaft signals of rotational speed sensor switch logic of programmable logic device (CPLD) of the present invention is illustrated
Figure.
As shown in figure 9, rotating speed switch logic is constituted by being combined with door, not gate in CPLD, it is 2 to select 1 logic, that is, I/O controls
, as with signal output, switch logic is as shown in table 2 for signal deciding Crank1 or Crank2.Microcontroller only judges standby song
Whether shaft speed transducer signal is normal, for avoiding the interruption frequency that standby crankshaft rotational speed sensor signal produces too high,
Add 4 frequency counters in CPLD to reduce signal frequency, improve program stable.
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 that the present invention provides.
As shown in Figure 10, this system includes：Signal acquisition module 10, for obtaining the flywheel end revolution speed sensing of real-time measurement
The first tach signal and the second tach signal of free end speed probe generation that device produces.Signal detection module 20, is used for
Detect whether the first tach signal or the second tach signal saltus step.First computing module 30, for working as signal detection module
20 detect the first tach signal or when the second tach signal saltus step, by corresponding for the first tach signal flywheel end rotating speed
The fault count value of sensor or the second tach signal corresponding free end speed probe reinforces definite value.Specifically, fixed value
Can freely set.First judge module 40, for judging fault count value or the free end of described flywheel end speed probe
Whether the fault count value of speed probe exceedes limits value.Fault determination module 50, for based on the first judge module 40
Judged result, determines fault speed probe.Specifically, fault determination module 50 is used for determining free end speed probe fault
And/or flywheel end speed probe fault.
As shown in Figure 10, signal detection module 20 includes：Number of teeth amount statistic unit 21, for detect the first tach signal or
Before hypodontia in second tach signal, whether the quantity of accumulative orthodont reaches threshold value.Signal determining unit 22, for working as the number of teeth
When the statistics of amount statistic unit 21 reaches threshold value for the quantity of orthodont, judge described first tach signal and/or second
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, this system also includes：Second judge module 41, for when diesel engine is in the operation phase and former
Barrier determining module 50 is when judging fault sensor as free end speed probe, judge free end speed probe be whether with
Speed probe.
Handover module 60, is with rotating speed for the judged result when the second judge module 41 for free end speed probe
During sensor, receive and instruct and switch to flywheel end speed probe.Being additionally operable to the judged result when the second judge module 41 is
Fault speed probe be non-do not switch over speed probe, receiving to instruct, be continuing with free end revolution speed sensing
Device.
Second judge module 41, is additionally operable to when diesel engine is in the operation phase and fault determination module 50 judges that fault passes
When sensor is flywheel end speed probe, judge that whether flywheel end speed probe is with speed probe.
Handover module 60, being additionally operable to when the judged result of the second judge module 41 is with turning for flywheel end speed probe
During fast sensor, receive and instruct and switch to free end speed probe.It is additionally operable to the judged result when the second judge module 41
For fault speed probe be non-when using speed probe, receive and instruct and do not switch over, be continuing with flywheel end rotating speed
Sensor.
Handover module 60, is additionally operable to judge that described fault speed probe passes as free end rotating speed when fault determination module 50
Sensor and flywheel end speed probe, receive and instruct and select flywheel end speed probe.
Handover module 60, is additionally operable to when diesel engine is in the shutdown stage and fault determination module 50 judges fault sensor
For free end speed probe, reception instructs and does not switch over, and is continuing with free end speed probe；
Handover module 60, is additionally operable to when diesel engine is in the shutdown stage and fault determination module 50 judges fault sensor
During for flywheel end speed probe, reception instructs and does not switch over, and is continuing with flywheel end speed probe.
As shown in Figure 10, this system also includes：Second computing module 31, for detecting first when signal detection module 20
When saltus step at least one of tach signal and/or the second tach signal tach signal, the tach signal of saltus step will be there is
The fault count value of corresponding speed probe resets.
Specifically, if signal occur saltus step for free end speed probe, by the fault of free end speed probe
Count value resets, if signal occur saltus step for flywheel end speed probe, by the failure count of flywheel end speed probe
Value resets, if the signal of flywheel end speed probe and free end speed probe all occurs saltus step, flywheel end rotating speed is passed
Sensor and free end speed probe fault count value all reset.
As shown in Figure 10, this system also includes：3rd judge module 42, is used for judging whether that key door is detected starts letter
Number or car load bus start signal.Signal acquisition module 10, for detecting described enabling signal when the second judge module 42
Afterwards, the first tach signal and the second tach signal are obtained.
As described above, the present invention describes a kind of online fault detection method and the corresponding system of the method for diesel engine in detail
System, by technical scheme, in the case of not needing diesel engine stop and not needing operator, can be right
Diesel engine carries out online fault detect.By technical scheme, it also avoid exporting by direct measurement sensor
Voltage carrys out failure judgement, when being changed or null offset due to sensor characteristics, the situation of missing inspection.Also avoid
Output voltage is affected by power-supply system, if power-supply system is unstable, flase drop situation.
It should be appreciated that the above-mentioned specific embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, and be not construed as limiting the invention.Therefore, that is done in the case of without departing from the spirit and scope of the present invention is any
Modification, equivalent, improvement etc., should be included within the scope of the present invention.Additionally, claims purport of the present invention
Covering the whole changes falling in scope and border or the equivalents on this scope and border and repair
Change example.
Claims (10)
1. a kind of online fault detection method of diesel engine is it is characterised in that methods described includes：
Obtain the first tach signal that the flywheel end speed probe of in real time measurement produces and free end speed probe produces
Second tach signal；
Detect whether described first tach signal and the second tach signal saltus step；
When described first tach signal is detected and/or the second tach signal saltus step, by described first tach signal
The fault count value of corresponding flywheel end speed probe or the second tach signal corresponding free end speed probe is fixed
Value；
Judge whether the fault count value of flywheel end speed probe and the fault count value of free end speed probe exceed limit
Value processed；
If exceeding limits value, judge the corresponding speed probe of this fault count value as fault speed probe.
2. method according to claim 1, wherein, whether described detection the first tach signal and the second tach signal occur
Saltus step includes：
Before detecting hypodontia in described first tach signal and the second tach signal, whether the quantity of accumulative orthodont reaches threshold value；
If so, judge that described first tach signal and/or the second tach signal are working properly；
Otherwise, it is determined that described first tach signal and/or the work of the second tach signal are abnormal.
3. method according to claim 1, wherein, judges the corresponding speed probe of this fault count value as event described
After the step of barrier speed probe, also include：
When described diesel engine is in the operation phase, if described fault sensor is described free end speed probe, judge institute
Whether state free end speed probe is with speed probe；
If described free end speed probe is with speed probe, switch to described flywheel end speed probe；If described
Fault speed probe does not switch over speed probe for non-, is continuing with described free end speed probe；
When described diesel engine is in the operation phase, if described fault sensor is described flywheel end speed probe, judge institute
Whether state flywheel end speed probe is with speed probe：
If described flywheel end speed probe is with speed probe, switch to described free end speed probe；When described
Fault speed probe does not switch over when using speed probe for non-, is continuing with described flywheel end speed probe；
If described fault speed probe is described free end speed probe and described flywheel end speed probe, select described
Flywheel end speed probe；
When described diesel engine is in the shutdown stage, if described fault sensor is described free end speed probe, do not carry out
Switching, is continuing with described free end speed probe；
When described diesel engine is in the shutdown stage, if described fault sensor is described flywheel end speed probe, do not carry out
Switching, is continuing with described flywheel end speed probe.
4. method according to claim 1, wherein, when detecting described first tach signal and/or the second tach signal
When saltus step occurs, the corresponding described flywheel end speed probe of described first tach signal or the second rotating speed letter of saltus step will occur
The fault count value of number corresponding described free end speed probe resets.
5. the method according to any one of claim 1-4, wherein, in described acquisition the first tach signal and the second rotating speed
Before the step of signal, also include：
Judge whether start signal key door enabling signal or car load bus is detected；
After described enabling signal is detected, the described step obtaining the first tach signal and the second tach signal of execution.
6. a kind of online fault detection system of diesel engine is it is characterised in that described system includes：
Signal acquisition module (10), the first tach signal that the flywheel end speed probe for obtaining real-time measurement produces and from
The second tach signal being produced by end speed probe；
Signal detection module (20), for detecting whether described first tach signal and the second tach signal saltus step；
First computing module (30), for detecting described first tach signal and/or second turn when signal detection module (20)
When saltus step in fast signal, by corresponding for described first tach signal flywheel end speed probe or described second tach signal
The fault count value of corresponding free end speed probe reinforces definite value；
First judge module (40), for judging fault count value or the free end revolution speed sensing of described flywheel end speed probe
Whether the fault count value of device exceedes limits value；
Fault determination module (50), for the judged result based on described first judge module (40), determines fault revolution speed sensing
Device.
7. system according to claim 6, wherein, described signal detection module (20) includes：
Number of teeth amount statistic unit (21), just adds up before hypodontia in described first tach signal and the second tach signal for detecting
Often whether the quantity of tooth reaches threshold value；
Signal determining unit (22), for reaching threshold value when the quantity that the statistics of number of teeth amount statistic unit (21) is orthodont
When, judge that described first tach signal and/or the second tach signal are working properly；Otherwise, it is determined that described first tach signal and/
Or second tach signal work abnormal.
8. system according to claim 6, wherein, described system also includes：
Second judge module (41), for when described diesel engine is in the operation phase and described fault determination module (50) judge
When described fault sensor is free end speed probe, judge that whether described free end speed probe is with revolution speed sensing
Device；
Handover module (60), for when the second judge module (41) judged result for described free end speed probe be with
During speed probe, switch to described flywheel end speed probe；It is additionally operable to the judgement knot when described second judge module (41)
Fruit is that described fault speed probe does not switch over speed probe for non-, is continuing with described free end rotating speed and passes
Sensor；
Described second judge module (41), is additionally operable to when described diesel engine is in the operation phase and described fault determination module
(50) when judging described fault sensor as flywheel end speed probe, judge described flywheel end speed probe be whether with
Speed probe；
Described handover module (60), being additionally operable to when the judged result of the second judge module (41) is described flywheel end speed probe
It is when using speed probe, switch to described free end speed probe；It is additionally operable to the judgement when the second judge module (41)
Result is that described fault speed probe does not switch over when using speed probe for non-, is continuing with flywheel end rotating speed and passes
Sensor；
Described handover module (60), is additionally operable to judge that described fault speed probe turns as free end when fault determination module (50)
Fast sensor and flywheel end speed probe, select described flywheel end speed probe；
Described handover module (60), is additionally operable to when described diesel engine is in the shutdown stage and described fault determination module (50) is sentenced
Fixed described fault sensor is free end speed probe, does not switch over, is continuing with free end speed probe；
Described handover module (60), is additionally operable to when described diesel engine is in the shutdown stage and described fault determination module (50) is sentenced
When fixed described fault sensor is flywheel end speed probe, does not switch over, be continuing with described flywheel end speed probe.
9. system according to claim 6, wherein, described system also includes：
Second computing module (31), for detecting described first tach signal and/or second turn when signal detection module (20)
When saltus step in fast signal, the corresponding described flywheel end speed probe of described first tach signal or second of saltus step will be there is
The fault count value of tach signal corresponding described free end speed probe resets.
10. the system according to any one of claim 6-9, wherein, described system also includes：
3rd judge module (42), for judging whether start signal key door enabling signal or car load bus is detected；
Described signal acquisition module (10), for, after described second judge module (42) detects described enabling signal, obtaining
Described first tach signal and described second tach signal.
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Cited By (4)
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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 |
| CN111255566A (en) * | 2020-05-06 | 2020-06-09 | 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 |
| CN113791239A (en) * | 2021-09-01 | 2021-12-14 | 哈尔滨工程大学 | Diesel engine rotating speed signal preamplification device |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111366370B (en) * | 2020-04-15 | 2021-04-20 | 东风汽车集团有限公司 | Engine fault injection method and system |
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