CN110005536A - A kind of method of calibration of rail pressure sensor, device and engine - Google Patents

A kind of method of calibration of rail pressure sensor, device and engine Download PDF

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Publication number
CN110005536A
CN110005536A CN201910488828.9A CN201910488828A CN110005536A CN 110005536 A CN110005536 A CN 110005536A CN 201910488828 A CN201910488828 A CN 201910488828A CN 110005536 A CN110005536 A CN 110005536A
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CN
China
Prior art keywords
rail pressure
value
rail
pressure sensor
atmospheric
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CN201910488828.9A
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Chinese (zh)
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CN110005536B (en
Inventor
吕宪勇
宋国梁
王立国
穆大芸
胡永慧
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潍柴动力股份有限公司
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Priority to CN201910488828.9A priority Critical patent/CN110005536B/en
Publication of CN110005536A publication Critical patent/CN110005536A/en
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Publication of CN110005536B publication Critical patent/CN110005536B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D41/222Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices

Abstract

This application discloses a kind of method of calibration of rail pressure sensor, device and engine, method includes: to carry out row pressure to the common rail pipe of engine;Using rail pressure sensor, the first rail pressure value in the common rail pipe is obtained;Based on the first rail pressure value and atmospheric value, the check results of the rail pressure sensor are obtained;The check results at least characterize the deviation fault of the rail pressure sensor.

Description

A kind of method of calibration of rail pressure sensor, device and engine

Technical field

This application involves technical field of engines, in particular to a kind of method of calibration of rail pressure sensor, device and start Machine.

Background technique

In engine start, the movement of fuel injector is controlled using the pressure in common rail pipe as parameter, and the pressure of common rail is logical It is often acquired using rail pressure sensor, under the collected common rail pressure of rail pressure sensor institute, the movement of fuel injector is controlled, with control System enters the amount of fuel of cylinder.

As it can be seen that rail pressure sensor the accuracy of collected pressure parameter directly affect the normal operation of engine.

Therefore, need whether one kind the accurate school of deviation progress can occurs to the collected pressure parameter of rail pressure sensor institute The technical solution tested.

Summary of the invention

In view of this, the method for calibration for being designed to provide a kind of rail pressure sensor, device and the engine of the application, are used To solve to need whether the technical issues of deviation is accurately verified occur to rail pressure sensor in the prior art.

This application provides a kind of methods of calibration of rail pressure sensor, comprising:

Row pressure is carried out to the common rail pipe of engine;

Using rail pressure sensor, the first rail pressure value in the common rail pipe is obtained;

Based on the first rail pressure value and atmospheric value, the check results of the rail pressure sensor are obtained;The check results are extremely The deviation fault of the rail pressure sensor is characterized less.

The above method, it is preferred that be based on the first rail pressure value and atmospheric value, obtain the verification of the rail pressure sensor As a result, comprising:

If the difference that the first rail pressure value is greater than between atmospheric value and the first rail pressure value and the atmospheric value is big In first threshold, generate the first check results, first check results show the rail pressure sensor there are positivity bias and The degree of the positivity bias is corresponding with the difference;

If the first rail pressure value is less than the difference between the atmospheric value and the first rail pressure value and the atmospheric value Value is greater than second threshold, generates the second check results, and second check results show the rail pressure sensor there are negative senses inclined The degree of the poor and described negative sense deviation is corresponding with the difference.

The above method, it is preferred that utilize rail pressure sensor, obtain the first rail pressure value in the common rail pipe, comprising:

Using rail pressure sensor, multiple rail pressure values of the common rail pipe in the first duration are acquired;

Based on the multiple rail pressure value, the first rail pressure value is obtained.

The above method, it is preferred that if the engine is in the resting state after powering on, start at described Dui Before the common rail pipe of machine carries out row pressure, the method also includes:

Using the rail pressure sensor, the second rail pressure value in the common rail pipe is obtained;

If the second rail pressure value is greater than atmospheric value, executes the common rail pipe to engine and carry out row pressure, and utilize rail Pressure sensor obtains the first rail pressure value in the common rail pipe, then is based on the first rail pressure value and atmospheric value, described in acquisition The check results of rail pressure sensor;

If showing that the second rail pressure value is less than the atmospheric value, execution is described to utilize rail pressure sensor, obtains described total The first rail pressure value in rail pipe, then it is based on the first rail pressure value and atmospheric value, obtain the verification knot of the rail pressure sensor Fruit.

The above method, it is preferred that if the second rail pressure value is greater than atmospheric value, correspondingly, described based on described the One rail pressure value and atmospheric value, obtain the check results of the rail pressure sensor, comprising:

If the first rail pressure value is persistently greater than atmospheric value and/or the first rail pressure value and described big in the first duration Difference between atmospheric pressure value is greater than first threshold, generates the first check results, and first check results show that the rail pressure passes That there are the degree of positivity bias and the positivity bias is corresponding with the difference for sensor.

The above method, it is preferred that the common rail pipe to engine carries out row pressure, comprising:

Based on preset row pressure duration value, row pressure is carried out to the common rail pipe of engine.

Present invention also provides a kind of calibration equipments of rail pressure sensor, comprising:

Row pressure control unit carries out row pressure for the common rail pipe to engine;

Acquisition control unit obtains the first rail pressure value in the common rail pipe for utilizing rail pressure sensor;

Verification unit obtains the check results of the rail pressure sensor for being based on the first rail pressure value and atmospheric value;Institute State the deviation fault that check results at least characterize the rail pressure sensor.

Present invention also provides a kind of engines, comprising:

Common rail pipe;

Fuel injector carries out row pressure for the common rail pipe to engine;

Rail pressure sensor, for obtaining the first rail pressure value in the common rail pipe;

Processor obtains the check results of the rail pressure sensor for being based on the rail pressure value and atmospheric value;The verification As a result the deviation fault of the rail pressure sensor is at least characterized.

As it can be seen from the above scheme method of calibration, device and the engine of a kind of rail pressure sensor provided by the present application, pass through Row pressure is carried out to the common rail pipe in engine, so that it is oil-free in common rail pipe, it recycles in rail pressure sensor acquisition common rail pipe After first rail pressure value, and then the check results of rail pressure sensor are obtained with based on the first rail pressure value and atmospheric value, with Characterize the deviation fault in rail pressure sensor.As it can be seen that in the application before being verified to rail pressure sensor, first to common rail Pipe carries out row pressure, so that the situation for having oil in common rail pipe is excluded in verification, as a result, being on common rail pipe inner principle Normal atmospheric pressure condition, and then verified based on atmospheric value first rail pressure value collected to rail pressure sensor, so that school Test result is not influenced by other factors, and then improves the accuracy of the check results of rail pressure sensor.

Detailed description of the invention

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of application for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.

Fig. 1 is a kind of flow chart of the method for calibration for rail pressure sensor that the embodiment of the present application one provides;

Fig. 2 is a kind of partial process view of the method for calibration for rail pressure sensor that the embodiment of the present application one provides;

Fig. 3 is a kind of another flow chart of the method for calibration for rail pressure sensor that the embodiment of the present application one provides;

Fig. 4 is a kind of structural schematic diagram of the calibration equipment for rail pressure sensor that the embodiment of the present application two provides;

Fig. 5 is a kind of structural schematic diagram for engine that the embodiment of the present application two provides;

Fig. 6 and Fig. 7 is respectively the example flow diagram of the embodiment of the present application.

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall in the protection scope of this application.

It is a kind of implementation flow chart of the method for calibration for rail pressure sensor that the embodiment of the present application one provides with reference to Fig. 1, this Rail pressure sensor of the method for calibration suitable for engine in common rail pipe in embodiment is verified with the presence or absence of deviation.

Specifically, this method may comprise steps of in the present embodiment:

Step 101: row pressure is carried out to the common rail pipe of engine.

Wherein, it can use fuel injector in the present embodiment and empty injection carried out to the common rail pipe of engine, to realize row pressure, and The result of row pressure theoretically makes the pressure state in common rail pipe consistent with the atmospheric pressure state outside common rail pipe, i.e., with it is common big Atmospheric pressure state is consistent, the atmospheric pressure state of surrounding enviroment where atmospheric pressure state here refers to engine.

It should be noted that the premise verified in the present embodiment to rail pressure sensor is, the common rail pipe of engine It is able to carry out row pressure, engine is now in inactive state as a result, or engine is in shutdown status.And if to rail Pressure sensor carries out in checking procedure, and engine start starts turning, and checking process terminates at this time, and engine is waited to shut down it Decide whether to be verified again afterwards.

Step 102: utilizing rail pressure sensor, obtain the first rail pressure value in common rail pipe.

Wherein, rail pressure sensor is that the sensor detected in common rail pipe to its internal pressure is arranged in, as originally Need to carry out the rail pressure sensor of deviation verification in case.The acquisition of rail pressure value is carried out simultaneously by using rail pressure sensor in the present embodiment Rail pressure value is verified, to determine rail pressure sensor with the presence or absence of deviation fault.

Step 103: being based on the first rail pressure value and atmospheric value, obtain the check results of rail pressure sensor.

Wherein, check results at least characterize the deviation fault of rail pressure sensor, specifically, may include in check results Have: rail pressure sensor whether the parameter value of deviation, rail pressure sensor Deviation Type parameter value and rail pressure sensor in phase Answer the parameter value of extent of deviation, etc. on Deviation Type.

It should be noted that carrying out the acquisition of rail pressure value by using rail pressure sensor in the present embodiment and being based on atmospheric value The collected rail pressure value of rail pressure sensor is verified, to obtain the check results of rail pressure sensor, at least to characterize rail pressure The deviation fault of sensor.

As it can be seen from the above scheme a kind of method of calibration for rail pressure sensor that the embodiment of the present application one provides, by hair Common rail pipe in motivation carries out row pressure, so that it is oil-free in common rail pipe, recycle first in rail pressure sensor acquisition common rail pipe After rail pressure value, and then the check results of rail pressure sensor are obtained with based on the first rail pressure value and atmospheric value, with characterization Deviation fault in rail pressure sensor.As it can be seen that in the present embodiment before being verified to rail pressure sensor, first to common rail pipe Row pressure is carried out, so that the situation for having oil in common rail pipe is excluded in verification, as a result, theoretically general in common rail pipe Logical atmospheric pressure state, and then verified based on atmospheric value first rail pressure value collected to rail pressure sensor, so that verification As a result it is not influenced by other factors, and then improves the accuracy of the check results of rail pressure sensor.

In one implementation, step 103 can be accomplished by the following way in the present embodiment, as shown in Figure 2:

Step 201: the size relation between the first rail pressure value and atmospheric value is judged, if the first rail pressure value is greater than atmospheric value And the first difference between rail pressure value and atmospheric value is greater than first threshold, executes step 202, if the first rail pressure value be less than it is big Difference between atmospheric pressure value and the first rail pressure value and atmospheric value is greater than second threshold, executes step 203.

Wherein, atmospheric value can be obtained by network, such as wifi or bluetooth or other communication modules, in network server Or atmospheric value in current surrounding enviroment is obtained in other equipment.

It should be noted that first threshold and second threshold are the positive number greater than 0, the two can be identical or different, For pre-set value, in the practical application of the present embodiment, can according to demand such as checking precision setting first threshold and The size of second threshold.

Step 202: generating the first check results.

Wherein, the first check results show rail pressure sensor there are the degree of positivity bias and positivity bias is opposite with difference It answers.Specifically, the difference between the first rail pressure value and atmospheric value is got in the case where the first rail pressure value is greater than atmospheric value Greatly, show that deviation of the rail pressure sensor on positivity bias is bigger, difference is smaller, shows rail pressure sensor on positivity bias Deviation is smaller.

Step 203: generating the second check results.

Wherein, the second check results show rail pressure sensor there are the degree of negative sense deviation and negative sense deviation is opposite with difference It answers.Specifically, the difference between the first rail pressure value and atmospheric value is got in the case where the first rail pressure value is less than atmospheric value Greatly, show that deviation of the rail pressure sensor in negative sense deviation is bigger, difference is smaller, shows rail pressure sensor in negative sense deviation Deviation is smaller.

In addition, if the first rail pressure value is equal or approximately uniform with atmospheric value, as difference is less than first threshold or difference Less than second threshold, then then thinking that rail pressure sensor does not have failure, belong to normal operation.

Further, when occurring positivity bias or negative sense deviation in check results, warning message is exported, such as in display screen Upper output alarm mark plays alarm signal by loudspeaker, to remind driver to repair in time.

In one implementation, step 102, can be in the following manner when obtaining the first rail pressure value in the present embodiment It realizes:

Firstly, acquiring multiple rail pressure values of the common rail pipe in the first duration using rail pressure sensor.And then it is more based on these A rail pressure value obtains the first rail pressure value.

Specifically, can be averaged to multiple rail pressure values in the present embodiment, to obtain the first rail pressure value or this implementation It can take in multiple rail pressure values and be most worth in example, such as maximum value or minimum value, as the first rail pressure value.

Wherein, the first duration can such as checking precision be arranged according to demand, such as 1 minute or half an hour duration, In first duration, the rail pressure value in common rail pipe is continued to monitor using rail pressure sensor, after obtaining multiple rail pressure values, to more A rail pressure value summation averages or selects again the most value in multiple rail pressure values to participate in subsequent school to obtain the first rail pressure value The the first rail pressure value tested can be the collected average value of rail pressure sensor in the first duration, or maximum value or most Small value.

In one implementation, in the present embodiment before executing step 101, following steps, such as Fig. 3 can be first carried out Shown in:

Step 104: monitor the working condition of engine, if engine power on after resting state, execute step Rapid 105, otherwise, execute step 101.

Wherein, the inactive state after engine powers on after T15 is powered in engine it is to be understood that be controlled electronically single First ECU(Electronic Control Unit) initialization state, engine does not start turning at this time, in rail pressure usually There is no fuel oil, step 105 can be first carried out at this time.In addition to this, if engine is in into shutdown phase certain time length State, after electricity under T15, engine starts to postpone lower electricity, at this point, may exist remaining fuel oil in common rail pipe, at this point, holding Row step 101 carries out row pressure to the common rail pipe of engine.

Step 105: utilizing rail pressure sensor, obtain the second rail pressure value in common rail pipe, if the second rail pressure value is greater than greatly Otherwise atmospheric pressure value, executes step 102 then executing step 101.

Wherein, the second rail pressure value can be the collected instantaneous rail pressure value of rail pressure sensor, or rail pressure sensor Mean rail pressure value in collected second duration is most worth.

If the second rail pressure value is greater than atmospheric value, show in rail pressure sensor positivity bias at this time or common rail pipe There is oil, at this time, it may be necessary to exclude to the situation for having oil in common rail pipe, i.e., execution step 101 carries out row pressure, row pressure to common rail pipe And then step 102 and step 103 are executed, as a result, to the collected first rail pressure value of rail pressure sensor institute after row pressure using greatly Atmospheric pressure value is verified, so that verifying out rail pressure sensor is positivity bias or negative sense deviation and corresponding extent of deviation;

And if the second rail pressure value is less than atmospheric value, showing rail pressure sensor, there are negative sense deviations, and in order to further The accuracy of verification is improved, step 102 and step 103 are executed, further to collected first rail pressure of rail pressure sensor institute The value such as average value in the first duration or most value carry out secondary verification using atmospheric value, are such as to verify out rail pressure sensor Positivity bias or negative sense deviation and corresponding extent of deviation.

Specifically, step 102 specifically can be real in the following manner if the second rail pressure value is greater than atmospheric value It is existing:

Judge whether persistently (the first rail pressure value is the first rail pressure value i.e. in the first duration greater than atmospheric value in the first duration It is no to drop under atmospheric value) and/or the first rail pressure value and atmospheric value between difference whether be greater than first threshold, if The first rail pressure value does not decline or drops under atmospheric value or the first rail pressure value and atmospheric value in the first duration Between difference be still greater than first threshold, then generate the first check results, the first check results show that rail pressure sensor exists The degree of positivity bias and positivity bias is corresponding with difference.

In one implementation, the present embodiment, can be by presetting a row when carrying out row pressure to common rail pipe Duration value is pressed, and then using fuel injector is carried out to common rail pipe the time that empty spray maintains the row pressure duration value, to guarantee common rail pipe Interior oil can empty, and further increase the verification accuracy to rail pressure sensor as a result,.

It is a kind of structural schematic diagram of the calibration equipment for rail pressure sensor that the embodiment of the present application two provides with reference to Fig. 4, it should Calibration equipment can be set in the rail pressure sensor of engine, to the rail pressure sensor in common rail pipe in engine whether There are deviations to be verified.

In the present embodiment, the apparatus may include with lower unit:

Row pressure control unit 401 carries out row pressure for the common rail pipe to engine.

Wherein, row pressure control unit 401 can be set on fuel injector, control to fuel injector and then utilize spray Oily device carries out empty injection to the common rail pipe of engine, to realize row pressure, for example, preset row pressure duration value is based on, to engine Common rail pipe carry out row pressure.And the result of row pressure theoretically makes the atmospheric pressure outside pressure state and common rail pipe in common rail pipe State consistency, i.e., consistent with normal atmospheric pressure condition, the atmosphere of surrounding enviroment where atmospheric pressure state here refers to engine Pressure condition.

It should be noted that the premise verified in the present embodiment to rail pressure sensor is, the common rail pipe of engine It is able to carry out row pressure, engine is now in inactive state as a result, or engine is in shutdown status.And if to rail Pressure sensor carries out in checking procedure, and engine start starts turning, and checking process terminates at this time, and engine is waited to shut down it Decide whether to be verified again afterwards.

Acquisition control unit 402 obtains the first rail pressure value in common rail pipe for utilizing rail pressure sensor.

Wherein, rail pressure sensor is that the sensor detected in common rail pipe to its internal pressure is arranged in, as originally Need to carry out the rail pressure sensor of deviation verification in case.Acquisition control unit 402 can trigger rail pressure sensor in the present embodiment, And then the acquisition of rail pressure value is carried out by using rail pressure sensor and rail pressure value is verified, to determine whether rail pressure sensor deposits In deviation fault.

Verification unit 403 obtains the check results of rail pressure sensor for being based on the first rail pressure value and atmospheric value.

Wherein, check results at least characterize the deviation fault of rail pressure sensor, specifically, may include in check results Have: rail pressure sensor whether the parameter value of deviation, rail pressure sensor Deviation Type parameter value and rail pressure sensor in phase Answer the parameter value of extent of deviation, etc. on Deviation Type.

It should be noted that in the present embodiment verification unit 403 by using rail pressure sensor carry out the acquisition of rail pressure value simultaneously The collected rail pressure value of rail pressure sensor is verified based on atmospheric value, to obtain the check results of rail pressure sensor, with At least characterize the deviation fault of rail pressure sensor.

As it can be seen from the above scheme a kind of calibration equipment for rail pressure sensor that the embodiment of the present application two provides, by hair Common rail pipe in motivation carries out row pressure, so that it is oil-free in common rail pipe, recycle first in rail pressure sensor acquisition common rail pipe After rail pressure value, and then the check results of rail pressure sensor are obtained with based on the first rail pressure value and atmospheric value, with characterization Deviation fault in rail pressure sensor.As it can be seen that in the present embodiment before being verified to rail pressure sensor, first to common rail pipe Row pressure is carried out, so that the situation for having oil in common rail pipe is excluded in verification, as a result, theoretically general in common rail pipe Logical atmospheric pressure state, and then verified based on atmospheric value first rail pressure value collected to rail pressure sensor, so that verification As a result it is not influenced by other factors, and then improves the accuracy of the check results of rail pressure sensor.

In one implementation, verification unit 403 is being based on the first rail pressure value and atmospheric value, obtains rail pressure sensor Check results when, realized especially by following manner:

If the first rail pressure value is greater than the difference between atmospheric value and the first rail pressure value and atmospheric value and is greater than first threshold, raw At the first check results, the first check results show rail pressure sensor, and there are the degree of positivity bias and positivity bias and difference phase It is corresponding;

If the first rail pressure value is less than the difference between atmospheric value and the first rail pressure value and atmospheric value and is greater than second threshold, raw At the second check results, the second check results show rail pressure sensor, and there are the degree of negative sense deviation and negative sense deviation and difference phase It is corresponding.

In one implementation, acquisition control unit 402 is utilizing rail pressure sensor, obtains the first rail in common rail pipe When pressure value, realized especially by following manner:

Using rail pressure sensor, multiple rail pressure values of the common rail pipe in the first duration are acquired;It is based on multiple rail pressure values again, obtains the One rail pressure value.

In one implementation, it if engine is in the resting state after powering on, is total to engine Before rail pipe carries out row pressure, acquisition control unit 402 can also utilize rail pressure sensor, obtain the second rail pressure in common rail pipe Value;If the second rail pressure value is greater than atmospheric value, first triggers row pressure control unit 401 and row pressure is carried out to the common rail pipe of engine, Recycle rail pressure sensor, obtain common rail pipe in the first rail pressure value, later trigger verification unit 403 be based on the first rail pressure value with Atmospheric value obtains the check results of rail pressure sensor;If showing that the second rail pressure value is less than atmospheric value, passed first with rail pressure Sensor obtains the first rail pressure value in common rail pipe, then triggers verification unit 403 and be based on the first rail pressure value and atmospheric value, obtains The check results of rail pressure sensor.

Further, if the second rail pressure value is greater than atmospheric value, correspondingly, verification unit 403 is being based on the first rail pressure Value and atmospheric value are specifically as follows when obtaining the check results of rail pressure sensor:

If the first rail pressure value is persistently being greater than between atmospheric value and/or the first rail pressure value and atmospheric value in the first duration Difference is greater than first threshold, generates the first check results, and the first check results show rail pressure sensor there are positivity bias and just Degree to deviation is corresponding with difference.

With reference to Fig. 5, for a kind of structural schematic diagram for engine that the embodiment of the present application three provides, which may include With flowering structure:

Common rail pipe 501.

Fuel injector 502 carries out row pressure for the common rail pipe 501 to engine.

Wherein, fuel injector 502 carries out empty injection to the common rail pipe 501 of engine in the present embodiment, to realize row pressure, and arranges The result of pressure theoretically makes the pressure state in common rail pipe 501 consistent with the atmospheric pressure state outside common rail pipe 501, i.e., with it is general Logical atmospheric pressure state is consistent, the atmospheric pressure state of surrounding enviroment where atmospheric pressure state here refers to engine.

It should be noted that the premise verified in the present embodiment to rail pressure sensor 503 is, the common rail of engine Pipe 501 is able to carry out row pressure, and engine is now in inactive state as a result, or engine is in shutdown status.And if It is carried out in checking procedure to rail pressure sensor 503, engine start starts turning, and checking process terminates at this time, waits pending Motivation decides whether to be verified again after shutting down.

Rail pressure sensor 503, for obtaining the first rail pressure value in common rail pipe 501.

Wherein, rail pressure sensor 503 is that the sensor detected in common rail pipe 501 to its internal pressure is arranged in, As need to carry out the rail pressure sensor of deviation verification in this case.Rail is carried out by using rail pressure sensor 503 in the present embodiment Pressure value is acquired and is verified to rail pressure value, to determine rail pressure sensor 503 with the presence or absence of deviation fault.

Processor 504 obtains the check results of rail pressure sensor 503 for being based on rail pressure value and atmospheric value.

Wherein, processor 504 can be realized for the ECU of engine.Check results at least characterize the inclined of rail pressure sensor 503 Poor failure, specifically, may include having in check results: rail pressure sensor 503 whether the parameter value of deviation, rail pressure sensor The parameter value of extent of deviation, etc. of the parameter value and rail pressure sensor of Deviation Type on corresponding Deviation Type.

It should be noted that carrying out the acquisition of rail pressure value by using rail pressure sensor in the present embodiment and being based on atmospheric value The collected rail pressure value of rail pressure sensor is verified, to obtain the check results of rail pressure sensor, at least to characterize rail pressure The deviation fault of sensor.

As it can be seen from the above scheme a kind of engine that the embodiment of the present application three provides, by the common rail pipe in engine Row pressure is carried out, so that it is oil-free in common rail pipe, after recycling the first rail pressure value in rail pressure sensor acquisition common rail pipe, in turn The check results of rail pressure sensor are obtained with based on the first rail pressure value and atmospheric value, it is inclined in rail pressure sensor to characterize Poor failure.As it can be seen that row pressure is carried out to common rail pipe first, to make in the present embodiment before verifying to rail pressure sensor The situation that have oil in common rail pipe is excluded in verification, as a result, in theoretically normal atmospheric pressure condition in common rail pipe, into And verified based on atmospheric value first rail pressure value collected to rail pressure sensor, so that check results are not by other factors Influence, and then improve rail pressure sensor check results accuracy.

In one implementation, processor 504 is being based on the first rail pressure value and atmospheric value, obtains rail pressure sensor When check results, realized especially by following manner:

If the first rail pressure value is greater than the difference between atmospheric value and the first rail pressure value and atmospheric value and is greater than first threshold, raw At the first check results, the first check results show rail pressure sensor, and there are the degree of positivity bias and positivity bias and difference phase It is corresponding;

If the first rail pressure value is less than the difference between atmospheric value and the first rail pressure value and atmospheric value and is greater than second threshold, raw At the second check results, the second check results show rail pressure sensor, and there are the degree of negative sense deviation and negative sense deviation and difference phase It is corresponding.

In one implementation, rail pressure sensor 503 is specific logical when obtaining the first rail pressure value in common rail pipe 501 Cross following manner realization:

Rail pressure sensor 503 acquires multiple rail pressure values of the common rail pipe 501 in the first duration;It is based on multiple rail pressure values again, obtains First rail pressure value.

In one implementation, it if engine is in the resting state after powering on, is total to engine Before rail pipe carries out row pressure, rail pressure sensor 503 first obtains the second rail pressure value in common rail pipe;If the second rail pressure value is greater than big Atmospheric pressure value then triggers fuel injector 502 and carries out row pressure to the common rail pipe of engine, rail pressure sensor 503 is recycled to obtain common rail pipe The first interior rail pressure value, preprocessor 504 be based on the first rail pressure value and atmospheric value, obtain rail pressure sensor 503 verification As a result;If showing that the second rail pressure value is less than atmospheric value, first in common rail pipe 501 is obtained first with rail pressure sensor 503 Rail pressure value, then the first rail pressure value and atmospheric value are based on by processor, obtain the check results of rail pressure sensor.

Further, if the second rail pressure value is greater than atmospheric value, correspondingly, processor 504 is being based on the first rail pressure value It is specifically as follows when obtaining the check results of rail pressure sensor with atmospheric value:

If the first rail pressure value is persistently being greater than between atmospheric value and/or the first rail pressure value and atmospheric value in the first duration Difference is greater than first threshold, generates the first check results, and the first check results show rail pressure sensor there are positivity bias and just Degree to deviation is corresponding with difference.

Below by taking automobile engine system as an example, the above scheme in the present embodiment is illustrated:

The present embodiment the principle on which is: when in common rail pipe without fuel oil, the collected practical rail pressure of rail pressure sensor is answered Equal to atmospheric pressure.Therefore can system operation before, in a period of time after system-down, actively create oil-free in common rail pipe Environment, then acquire practical rail pressure, compared with atmospheric pressure.Illustrate rail pressure if practical rail pressure is greater than atmospheric pressure There are positivity bias for sensor, and illustrating rail pressure sensor if practical rail pressure is less than atmospheric pressure, there are negative sense deviations.

Further, after detecting that rail pressure sensor has positive or negative sense deviation, failure is quoted, reminds driver Repair processing.

Specifically, being illustrated in the state of difference to the specific implementation of this case with engine below:

Power-up initializing stage rail pressure sensor testing process is as shown in Figure 6:

1, T15 powers on rear ECU and starts to initialize, and engine not yet starts at this time, usually without fuel oil in common rail pipe, but to ensure to examine The accuracy for surveying result, is tentatively judged according to collected practical rail pressure.Illustrate if practical rail pressure is more than atmospheric pressure There are fuel oil or rail pressure sensor, there are positivity bias in rail, then carry out row pressure.

2, it carries out row pressure: can be sprayed by fuel injector sky to carry out row pressure, unsnatch rail pressure fuel oil within the set time.If Practical rail pressure is still higher than atmospheric pressure after the completion of row pressure and the duration maintained is more than certain time length, then illustrates that rail pressure sensor exists Positivity bias terminates detection.

3, one section of practical rail pressure signal of continuous acquisition in detection process, calculate their average value, later by this practical rail It flattens mean value to be compared with atmospheric pressure, if it exceeds atmospheric pressure then quotes rail pressure sensor, there are positivity bias failures;If Subatmospheric, quoting rail pressure sensor, there are negative sense deviation faults.Terminate detection.

If detecting that engine starts turning during 4, detecting, detection process is exited, terminates detection

Shutdown phase rail pressure sensor testing process is as shown in Figure 7:

1, under T15 after electricity, system starts to postpone lower electricity, while carrying out pressure release by empty injection, sets row pressure deadline, row pressure Rail pressure signal acquisition is carried out after the completion.

2, one section of practical rail pressure signal of continuous acquisition calculates average value and is used for subsequent calculating.

If 3, practical rail pressure (average value) is more than atmospheric pressure, quoting rail pressure sensor, there are positivity bias failures;Such as Fruit border rail pressure is subatmospheric, then quoting rail pressure sensor, there are negative sense deviation faults.

4, terminate detection.

As it can be seen that acquiring practical rail pressure by creating environment oil-free in common rail pipe in the present embodiment and being compared with atmospheric pressure Compared with monitoring rail pressure sensor quotes failure with the presence or absence of exception in time, guarantees engine emission effect.

It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged Except there is also other identical elements in the process, method, article or apparatus that includes the element.

Detailed Jie has been carried out to method of calibration, device and the engine of a kind of rail pressure sensor provided herein above It continues, the foregoing description of the disclosed embodiments makes professional and technical personnel in the field can be realized or use the application.To these A variety of modifications of embodiment will be readily apparent to those skilled in the art, general original as defined herein Reason can be realized in other embodiments without departing from the spirit or scope of the application.Therefore, the application will not Be intended to be limited to the embodiments shown herein, and be to fit to it is consistent with the principles and novel features disclosed in this article most Wide range.

Claims (8)

1. a kind of method of calibration of rail pressure sensor characterized by comprising
Row pressure is carried out to the common rail pipe of engine;
Using rail pressure sensor, the first rail pressure value in the common rail pipe is obtained;
Based on the first rail pressure value and atmospheric value, the check results of the rail pressure sensor are obtained;The check results are extremely The deviation fault of the rail pressure sensor is characterized less.
2. obtaining institute the method according to claim 1, wherein being based on the first rail pressure value and atmospheric value State the check results of rail pressure sensor, comprising:
If the difference that the first rail pressure value is greater than between atmospheric value and the first rail pressure value and the atmospheric value is big In first threshold, generate the first check results, first check results show the rail pressure sensor there are positivity bias and The degree of the positivity bias is corresponding with the difference;
If the first rail pressure value is less than the difference between the atmospheric value and the first rail pressure value and the atmospheric value Value is greater than second threshold, generates the second check results, and second check results show the rail pressure sensor there are negative senses inclined The degree of the poor and described negative sense deviation is corresponding with the difference.
3. method according to claim 1 or 2, which is characterized in that utilize rail pressure sensor, obtain in the common rail pipe First rail pressure value, comprising:
Using rail pressure sensor, multiple rail pressure values of the common rail pipe in the first duration are acquired;
Based on the multiple rail pressure value, the first rail pressure value is obtained.
4. the method according to claim 1, wherein if the engine is in inactive after powering on State, before the common rail pipe to engine carries out row pressure, the method also includes:
Using the rail pressure sensor, the second rail pressure value in the common rail pipe is obtained;
If the second rail pressure value is greater than atmospheric value, executes the common rail pipe to engine and carry out row pressure, and utilize rail Pressure sensor obtains the first rail pressure value in the common rail pipe, then is based on the first rail pressure value and atmospheric value, described in acquisition The check results of rail pressure sensor;
If showing that the second rail pressure value is less than the atmospheric value, execution is described to utilize rail pressure sensor, obtains described total The first rail pressure value in rail pipe, then it is based on the first rail pressure value and atmospheric value, obtain the verification knot of the rail pressure sensor Fruit.
5. according to the method described in claim 4, it is characterized in that, if the second rail pressure value is greater than atmospheric value, accordingly , it is described to be based on the first rail pressure value and atmospheric value, obtain the check results of the rail pressure sensor, comprising:
If the first rail pressure value is persistently greater than atmospheric value and/or the first rail pressure value and described big in the first duration Difference between atmospheric pressure value is greater than first threshold, generates the first check results, and first check results show that the rail pressure passes That there are the degree of positivity bias and the positivity bias is corresponding with the difference for sensor.
6. the method according to claim 1, wherein the common rail pipe to engine carries out row pressure, comprising:
Based on preset row pressure duration value, row pressure is carried out to the common rail pipe of engine.
7. a kind of calibration equipment of rail pressure sensor characterized by comprising
Row pressure control unit carries out row pressure for the common rail pipe to engine;
Acquisition control unit obtains the first rail pressure value in the common rail pipe for utilizing rail pressure sensor;
Verification unit obtains the check results of the rail pressure sensor for being based on the first rail pressure value and atmospheric value;Institute State the deviation fault that check results at least characterize the rail pressure sensor.
8. a kind of engine characterized by comprising
Common rail pipe;
Fuel injector carries out row pressure for the common rail pipe to engine;
Rail pressure sensor, for obtaining the first rail pressure value in the common rail pipe;
Processor obtains the check results of the rail pressure sensor for being based on the rail pressure value and atmospheric value;The verification As a result the deviation fault of the rail pressure sensor is at least characterized.
CN201910488828.9A 2019-06-06 2019-06-06 A kind of method of calibration of rail pressure sensor, device and engine CN110005536B (en)

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EP1316720A1 (en) * 2001-11-29 2003-06-04 Denso Corporation Common rail fuel injection system
JP2009197756A (en) * 2008-02-25 2009-09-03 Honda Motor Co Ltd Abnormality decision device for common-rail system
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method
CN102037229A (en) * 2008-05-23 2011-04-27 欧陆汽车有限责任公司 Method for identifying an error function and in particular a drift of a rail pressure sensor in a common rail injection system
CN102644514A (en) * 2012-05-09 2012-08-22 浙江大学 Diagnosis method for drift failure of rail pressure sensor in common rail system
CN103016181A (en) * 2012-11-19 2013-04-03 奇瑞汽车股份有限公司 Method for acquiring and monitoring oil orbit pressure signal
CN105257417A (en) * 2015-10-12 2016-01-20 中国第一汽车股份有限公司无锡油泵油嘴研究所 Fault detecting method for rail pressure sensor in common rail system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1316720A1 (en) * 2001-11-29 2003-06-04 Denso Corporation Common rail fuel injection system
JP2009197756A (en) * 2008-02-25 2009-09-03 Honda Motor Co Ltd Abnormality decision device for common-rail system
CN102037229A (en) * 2008-05-23 2011-04-27 欧陆汽车有限责任公司 Method for identifying an error function and in particular a drift of a rail pressure sensor in a common rail injection system
CN101598073A (en) * 2009-07-10 2009-12-09 奇瑞汽车股份有限公司 A kind of collection of pressure signal of oil rail and monitoring method
CN102644514A (en) * 2012-05-09 2012-08-22 浙江大学 Diagnosis method for drift failure of rail pressure sensor in common rail system
CN103016181A (en) * 2012-11-19 2013-04-03 奇瑞汽车股份有限公司 Method for acquiring and monitoring oil orbit pressure signal
CN105257417A (en) * 2015-10-12 2016-01-20 中国第一汽车股份有限公司无锡油泵油嘴研究所 Fault detecting method for rail pressure sensor in common rail system

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