CN101655406A - Method and device for zero point calibration of gas pressure sensor - Google Patents
Method and device for zero point calibration of gas pressure sensor Download PDFInfo
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- CN101655406A CN101655406A CN200910092600A CN200910092600A CN101655406A CN 101655406 A CN101655406 A CN 101655406A CN 200910092600 A CN200910092600 A CN 200910092600A CN 200910092600 A CN200910092600 A CN 200910092600A CN 101655406 A CN101655406 A CN 101655406A
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Abstract
The invention provides a method and a dehvice for the zero point calibration of a gas pressure sensor, which comprises the steps that: when a brake cylinder is released, the pressure value of the brake cylinder is obtained; the releasing process is judged to be normal or abnormal according to the time the pressure value is obtained and according to the pressure value; when the releasing process isnormal, the pressure value of the brake value is judged to whether reach zero or not; when the pressure value of the brake reaches zero, the pressure value obtained currently is compared with a pre-stored composite error nominal value; when the pressure value obtained currently is smaller than or equal to the composite error nominal value, the pressure value obtained currently is regarded as a zero point correct value; and the zero point of the gas pressure sensor is calibrated according to the zero point correct value. The method and the device can solve the problem of zero point drift and have simple operation and lowered workload and calibration cost.
Description
Technical field
The present invention relates to passenger vehicle braking detection range, particularly, relate to a kind of zero point calibration of gas pressure sensor method and device.
Background technology
At present, 104 type air dampers (hereinafter to be referred as 104 brakes) occupy very big proportion in the use of passenger train brake, are the principal mode brakes of 25 type passenger vehicles.In long-term use, unusual braking can appear in 104 brakes, as alleviates bad.Unusual braking is bigger to the train operating safety influence, for this reason, has developed passenger vehicle brake monitoring diagnostic system, and this system is used for the running status of monitoring, diagnosing passenger train brake system.Fig. 1 is the rough schematic of passenger vehicle brake monitoring diagnostic system, as shown in Figure 1, passenger vehicle brake monitoring diagnostic system comprises: the passenger vehicle braking detects diagnostic system compartment main frame, train tube pressure sensor (not shown), checking cylinder gas pressure sensor, this system adopts intelligent diagnostics technology that the pressure of 104 brakes is monitored, with real-time detection diagnosis motor vehicle braking system fault whether.
In passenger vehicle brake monitoring diagnostic system, the collection of checking cylinder pressure is the basis of intelligent diagnostics technology.The accuracy of image data directly influences diagnostic result, and the long gas pressure sensor of loading time can produce the zero drift phenomenon, and zero drift makes the output of gas pressure sensor produce bigger error.
The zero drift of gas pressure sensor mainly comprises two parts: temperature drift and time drift.Wherein, the temperature drift is because the change of the zero-pressure strong point output valve that the temperature variation of gas pressure sensor working environment causes; The time drift is owing to long-term use, the change of the aging zero-pressure strong point output valve that causes of circuit.
In most of watch-dogs, the zero drift problem of gas pressure sensor can solve by artificial demarcation, that is, regularly use the adjustment sensor to demarcate by the professional, and still, present artificial proving operation is comparatively complicated.In addition, because present passenger vehicle quantity is more,, then can produce bigger workload and higher cost if all adopt artificial the demarcation.
In sum, there is complicated operation in artificial demarcation, workload is big and the high problem of cost, how effectively to solve the zero drift problem of gas pressure sensor, does not propose clear and definite solution at present as yet.
Summary of the invention
The fundamental purpose of the embodiment of the invention is to provide a kind of zero point calibration of gas pressure sensor scheme, and artificial demarcation solves zero drift problem, the complicated operation that exists, workload is big and the high problem of cost to solve above-mentioned passing through.
To achieve these goals, the embodiment of the invention provides a kind of zero point calibration of gas pressure sensor method, and this method comprises: when checking cylinder is alleviated, obtain the pressure values of described checking cylinder; According to the moment of obtaining described pressure values and described pressure values, judge whether the process of described alleviation is normal; In the process of described alleviation just often, whether the pressure values of judging described checking cylinder reaches zero; When the pressure values of described checking cylinder reaches zero, current pressure values of obtaining and pre-stored composite error nominal are compared; In the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as the modified value at zero point; According to modified value at described zero point, to demarcating the zero point of described gas pressure sensor.
Wherein, when satisfying following condition, described checking cylinder is alleviated: the pressure values of described checking cylinder reaches first predetermined pressure value; And the pressure values fall off rate of described checking cylinder reaches set rate.
Above-mentionedly judge whether the process of described alleviation normally comprises:, judge whether described pressure values is always decrement states and whether does not exceed the alleviation zone boundary that prestores all the time according to the moment of obtaining described pressure values and described pressure values; If described pressure values is always decrement states and does not exceed described alleviation zone boundary all the time, then the process of described alleviation is normal; Wherein, described alleviation zone boundary is used to the effective range of indicating pressure values to change.
Perhaps, whether the process of judging described alleviation normally can comprise: the tangent slope numerical value that calculates the pressure change curve according to the moment of obtaining described pressure values and described pressure values; Judge whether described tangent slope numerical value is always decrement states; When described tangent slope numerical value is always decrement states, judge whether described pressure change curve is positioned at alleviation curve regions border; Alleviate the curve regions border if described pressure change curve is positioned at, then the process of described alleviation is normal; Wherein, described alleviation curve regions border is used to indicate the effective range of pressure change curve.。
Preferably, carry out the match of described pressure change curve by following formula:
y＝aX
3+bX
2+cX+d，
Wherein, X represents to obtain the moment of pressure values, and y represents pressure values, and a, b, c, d are rational number.
Described alleviation curve regions border comprises curve regions left margin and curve regions right margin, determine described curve regions left margin and described curve regions right margin in the following way:, determine the pressure change curve according to the pressure values of the volume of checking cylinder and/or the checking cylinder that obtains; With the time coordinate axle of the described pressure change curve curve that predetermined value obtains that moves to left, as described curve regions left margin; With the time coordinate axle of the described pressure change curve curve that predetermined value obtains that moves to right, as described curve regions right margin.
Whether the above-mentioned pressure values of judging described checking cylinder reaches zero comprises: if the pressure values of described checking cylinder reaches second predetermined pressure value, and the variation of the pressure values of described checking cylinder does not surpass the predetermined variation value in the given time, and then the pressure values of described checking cylinder reaches zero.
Particularly, in the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as zero point modified value comprise: during smaller or equal to described composite error nominal, store the described current pressure values of obtaining in the described current pressure values of obtaining; Alleviate once more at described checking cylinder, and the process of alleviating just often, when the pressure values of described checking cylinder reaches zero, obtain and store another current pressure values of obtaining; With the mean value of a plurality of current pressure values of obtaining of any one or storage in a plurality of current pressure values of obtaining of storage as modified value at described zero point.
After the current pressure values of obtaining and pre-stored composite error nominal compared, described method also comprised: during greater than described composite error nominal, abandon the described current pressure values of obtaining in the described current pressure values of obtaining.
The embodiment of the invention also provides a kind of zero point calibration of gas pressure sensor device, and described device comprises: the pressure acquiring unit is used to the moment of obtaining the pressure values of checking cylinder and obtaining described pressure values; First judging unit is used for judging according to the moment and the described pressure values of obtaining described pressure values whether the process of described alleviation is normal; Second judging unit is used in the process of described alleviation just often, judges whether the pressure values of described checking cylinder reaches zero; Comparing unit is used for when the pressure values of the described checking cylinder of described second judgment unit judges reaches zero current pressure values of obtaining of described pressure acquiring unit and pre-stored composite error nominal being compared; Zero point, the modified value determining unit was used in the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as the modified value at zero point; The Zero calibration unit is used for according to the described modified value at zero point that zero point, the modified value determining unit was determined, to demarcating the zero point of described gas pressure sensor.
Preferably, this device also comprises: alleviate judging unit, be used to judge whether described checking cylinder carries out the alleviation process.Storer is used to store the moment and the described pressure values of the described pressure values that described pressure acquiring unit obtains.
Particularly, above-mentioned first judging unit comprises: condition judgment module is used for judging according to the moment and the described pressure values of obtaining described pressure values whether described pressure values is always decrement states; The effective range judge module is used for judging according to the moment and the described pressure values of obtaining described pressure values whether described pressure values does not exceed the alleviation zone boundary that prestores all the time; Wherein, described alleviation zone boundary is used to the effective range of indicating pressure values to change.
Perhaps, first judging unit also can comprise: computing module is used for according to the tangent slope numerical value that obtains the moment of described pressure values, described pressure values calculating pressure change curve; Condition judgment module is used to judge whether described tangent slope numerical value is always decrement states; The effective coverage judge module is used for when described tangent slope numerical value is always decrement states, judges whether described pressure change curve is positioned at the alleviation curve regions border that prestores; Wherein, described alleviation curve regions border is used to indicate the effective range of pressure change curve.
Above-mentioned zero point, the modified value determining unit comprised: control module is used to dispatch described pressure acquiring unit, described first judging unit, described second judging unit, described comparing unit, to obtain a plurality of described current pressure values of obtaining; Memory module is used to store a plurality of described current pressure values of obtaining; Zero point, the modified value determination module was used for any one or mean value of a plurality of described current pressure values of obtaining of described memory module storage as modified value at described zero point.
By means of technique scheme one of at least, by alleviating principle, in the time of can being zero in the pressure values of checking cylinder, pressure values and the pre-stored composite error nominal that obtained this moment compare, under the situation smaller or equal to composite error nominal, the pressure values that can be obtained this moment is carried out the Zero calibration of gas pressure sensor as the modified value at zero point, than the artificial demarcation of prior art, the embodiment of the invention is simple to operate and can reduce workload and calibration cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the rough schematic of the passenger vehicle brake monitoring diagnostic system of correlation technique;
Fig. 2 is the synoptic diagram that the brake of correlation technique is alleviated gas circuit;
Fig. 3 is the pressure change curve of 104 brakes braking cylinder in the train travelling process of correlation technique;
Fig. 4 is the process flow diagram according to the zero point calibration of gas pressure sensor method of the embodiment of the invention;
Fig. 5 is the pressure change curve according to formula (2) match;
Fig. 6 is alleviated the pressure change curve that test obtains to the checking cylinder of three different-diameters;
Fig. 7 is the detail flowchart according to the zero point calibration of gas pressure sensor method of the embodiment of the invention;
Fig. 8 is the structured flowchart according to the zero point calibration of gas pressure sensor device of the embodiment of the invention;
Fig. 9 is the detailed block diagram according to the zero point calibration of gas pressure sensor device of the embodiment of the invention;
Figure 10 a, 10b are the concrete structure block diagrams according to first judging unit in the zero point calibration of gas pressure sensor device of the embodiment of the invention;
Figure 11 be according in the zero point calibration of gas pressure sensor device of the embodiment of the invention zero point modified value determining unit the concrete structure block diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Because, solve at present that there is complicated operation in the zero drift problem, workload is big and the high problem of cost by artificial demarcation, based on this, the embodiment of the invention provides a kind of zero point calibration of gas pressure sensor method and apparatus.
In order to understand the present invention better, at first introduce the alleviation principle of checking cylinder.Fig. 2 is the synoptic diagram that brake is alleviated gas circuit, as shown in Figure 2, when the supercharging of train pipe, when causing the chamber volume exhaust, the pressure balance of equalizing lever both sides is destroyed, and the pressure of checking cylinder moves down equalizing lever, after equalizing lever masthead face leaves balanced valve, the axial center hole of equalizing lever is opened, at this moment, to atmosphere, checking cylinder carries out exhaust alleviates process to the air in the checking cylinder by valve internal channel row.Chamber volume is together with equalizing lever cavity of resorption air single voiding, and the pressure of chamber volume can once be discharged to zero.The pressure of checking cylinder is controlled by chamber volume, because the pressure of chamber volume once is discharged to zero, the pressure of checking cylinder also once is discharged to zero.
A large amount of pressure change curves to 1 04 brakes braking cylinder in the train travelling process presents rule as shown in Figure 3, and when checking cylinder was alleviated, the pressure of checking cylinder can be discharged to zero.The present invention utilizes the pressure of checking cylinder in the alleviation process can be discharged to zero according to this principle of work, and the gas pressure sensor that obtains checking cylinder pressure is carried out Zero calibration.
The present invention is described in detail below in conjunction with accompanying drawing.
Embodiment one
The embodiment of the invention provides a kind of zero point calibration of gas pressure sensor method, and Fig. 4 is the process flow diagram of this method, and as shown in Figure 4, this method comprises:
Step 401 when checking cylinder is alleviated, is obtained the pressure values of checking cylinder;
Step 402 according to the moment of obtaining pressure values and pressure values, judges whether the process of alleviating is normal;
Step 403 in the alleviation process just often, judges whether the pressure values of checking cylinder reaches zero;
Step 404 when the pressure values of checking cylinder reaches zero, compares current pressure values of obtaining and pre-stored composite error nominal;
Step 405, in the current pressure values of obtaining during smaller or equal to composite error nominal, with the current pressure values of obtaining as the modified value at zero point;
Step 406 is according to the modified value at zero point, to demarcating the zero point of gas pressure sensor.
By above description as can be seen, by alleviating principle, in the time of can being zero in the pressure values of checking cylinder, pressure values and the pre-stored composite error nominal that obtained this moment compare, under the situation smaller or equal to composite error nominal, the pressure values that can be obtained this moment is carried out the Zero calibration of gas pressure sensor as the modified value at zero point, than the artificial demarcation of prior art, the embodiment of the invention is simple to operate and can reduce workload and calibration cost.
Below above steps is described in detail.
(1) step 401
When satisfying following condition, checking cylinder begins the alleviation process: the pressure values of (1) checking cylinder reaches predetermined pressure value; (2) the pressure values fall off rate of checking cylinder reaches set rate.When checking cylinder begins to alleviate, trigger Zero calibration method.
Above-mentioned predetermined pressure value can be 240kpa, and set rate can be 30kPa/s, below introduces determining of these two numerical value.
Can calculate the pressure of checking cylinder by following formula (1):
P
R＝2.6r-10????(1)
Wherein, r is a train pipe pressure reduction, P
RPressure for checking cylinder.
Consider the service braking state of brake generally speaking, according to the working specification requirement, the minimum decompression amount during train braking is 50kPa, by the observation to the process data of bus safety monitoring system registers, the decompression of train pipe is more for the operating mode of 100kPa, by formula (1) as can be known, when train pipe pressure reduction was 100kPa, the pressure of checking cylinder was 250kPa, therefore, pressure values in the time of 250kPa can being begun to alleviate as checking cylinder, that is, 250kPa is for triggering the initial checking cylinder pressure of Zero calibration.Consider the inconsistency of train system, can be triggered when the initial about 250kPa of brake-cylinder pressure that should provide certain surplus, rule of thumb value can be decided to be 240kPa with the initial pressure of triggering Zero calibration for guaranteeing in different systems Zero calibration.
In the starting stage that checking cylinder is alleviated, the pressure of checking cylinder descends rapidly, and therefore, the pressure values fall off rate of checking cylinder also is one of major parameter that triggers Zero calibration.This parameter can obtain by the structure of analyzing 104 brakes and the process data of observing a large amount of bus safety monitoring system registers.When checking cylinder is alleviated, the pressure balance of equalizing lever both sides is destroyed, the pressure of checking cylinder moves down equalizing lever, after the equalizing lever end face leaves balanced valve, the axial center hole of equalizing lever is opened, air row in the checking cylinder is to atmosphere, and this moment, checking cylinder pressure was the highest in whole alleviation process, checking cylinder pressure fall off rate maximum.As can be known, if pressure is 240kPa when alleviating, then the pressure fall off rate can reach about 40kPa/s on the process data of bus safety monitoring system registers.
According to the single car test performance data of 104 type brakes, the direct release time of mitigation is 5～7 seconds, and this process data with the bus safety monitoring system registers conforms to.Therefore, the initial pressure fall off rate that can trigger Zero calibration is set to 40kPa/s.In practical operation, because the model difference of checking cylinder, diameter is also different, makes the pressure fall off rate also different.The brake system of forming for the checking cylinder that adapts to different-diameter, guarantee that Zero calibration can be triggered in different systems, the initial pressure descending slope that can trigger Zero calibration is set to more than or equal to 30kPa/s, that is, as long as can trigger the Zero calibration operation more than or equal to 30kPa.
Therefore, when the initial pressure of checking cylinder greater than 240kPa and pressure fall off rate more than or equal to 30kPa/s, when this two condition satisfied simultaneously, the expression checking cylinder began the alleviation process, at this moment, can trigger the Zero calibration operation.
For the operation of the pressure values of obtaining checking cylinder, particularly, can be by experiment, checking cylinder is carried out quantitative test obtain pressure values in the checking cylinder alleviation process; Also can be in actual driving process, the checking cylinder alleviation process that detects the diagnostic system record by the passenger vehicle braking obtains the pressure values in the checking cylinder alleviation process, and this recording operation can be finished by gas pressure sensor, and the sampling period can be 200ms.
(2) step 402
Judge whether the alleviation process normally can have two kinds of methods, below describe this two methods respectively.
Method one:
According to the moment of obtaining pressure values and pressure values, judge whether pressure values is always decrement states and whether does not exceed the alleviation zone boundary that prestores all the time; Alleviate the zone boundary if pressure values is always decrement states and does not exceed all the time, it is normal then to alleviate process; Wherein, alleviate the effective range that the zone boundary is used to indicate the pressure values variation.
Method two:
According to the moment of obtaining pressure values and pressure values calculate the tangent slope numerical value of pressure change curve; Judge whether tangent slope numerical value is always decrement states; When tangent slope numerical value is always decrement states, judge whether the pressure change curve is positioned at alleviation curve regions border; Alleviate the curve regions border if the pressure change curve is positioned at, it is normal then to alleviate process.The tangent slope numerical value of the pressure change curve here promptly is above-mentioned pressure fall off rate value, alleviates the effective range that the curve regions border is used to indicate the pressure change curve.
Particularly, according to the pressure values of obtaining and corresponding constantly, by following formula (2) match pressure change curve (also can be called checking cylinder alleviation curve):
y＝aX
3+bX
2+cX+d，(2)
Wherein, X represents to obtain the moment of pressure values, and y represents pressure values, and a, b, c, d are rational number.
Table 1 is the pressure values in the checking cylinder alleviation process of the 25T type passenger vehicle that obtains and obtains constantly that by the numerical value shown in the table 1, can simulate curve as shown in Figure 5, wherein, the longitudinal axis among Fig. 5 is represented pressure, the transverse axis express time.
Table 1
| Second time (x) | Pressure values (y) kPa |
| ??0 | ??251 |
| ??1 | ??202 |
| ??3 | ??124 |
| ??5 | ??49 |
| ??8 | ??0 |
| ??10 | ??0 |
Because the diameter of checking cylinder can be between 152～457mm, the volume difference of checking cylinder is bigger, therefore, should determine to alleviate the scope of curve again after the structure of brake system has been determined, and the structure of brake system is determined, just represented that also the volume of checking cylinder is definite.
The checking cylinder alleviation curve that Fig. 6 obtains for the checking cylinder of three different-diameters being alleviated test, as shown in Figure 6, alleviate in the curve at three checking cylinders, solid line is represented the alleviation curve of the brake that alleviation speed is moderate, and two dotted lines are represented the alleviation curve of two brakes that alleviation speed is very fast and slower.Though three curve does not overlap but all is that normal checking cylinder is alleviated curve.In monitoring in real time,, just can judge that the alleviation process is normal as long as the checking cylinder of actual monitoring is alleviated curve in certain scope.In theory, for the checking cylinder of same type, pressure descends fast more in the more little pressure change curve of volume;
Because the volume of actual checking cylinder has certain error, in the alleviation process, pressure values changes can certain inconsistency, as long as within the specific limits, pressure values changes can regard normal as.Alleviation zone boundary in the method one can be equal to the alleviation curve regions border in the method two, all is used to the validity of judging that pressure values changes.Wherein, alleviate the zone boundary numeric representation, alleviate curve regions border curve representation, to the zone boundary that just can be eased of sampling, alleviation curve regions border.Below be described in detail alleviating the curve regions border.
Alleviate the curve regions border and comprise curve regions left margin and curve regions right margin, can determine curve regions left margin and curve regions right margin in the following way:
According to the pressure values of the volume of checking cylinder and/or the checking cylinder that obtains, determine the pressure change curve.
Because the volume of actual checking cylinder has certain error, therefore the difference of tracing pattern can appear alleviating, and the setting on border should adapt to the alleviation curve of different shape.Suitably the time shaft coordinate with the pressure change curve determined moves to left about 20% as the curve regions left margin, and the time shaft coordinate of the pressure change curve determined is moved to right about 20% as the curve regions right margin.By the observation to monitoring curve, the change of the alleviation tracing pattern that the error of volume causes can not surpass such margin range.
In practical operation, can obtain curve regions left margin and curve regions right margin by following two kinds of methods:
Method one: obtain pressure, the time relation data that brake is alleviated process by test, obtain many and alleviate normal pressure change curve, will be wherein one be defined as the pressure change curve, then, the time shaft coordinate of this pressure change curve is moved to left about 20% as left margin, the time shaft coordinate of this pressure change curve is moved to right about 20% as the right dividing value.
Method two: the process data by passenger vehicle brake monitoring system log (SYSLOG) obtains pressure, the time relation data that brake is alleviated process, obtain many and alleviate normal pressure change curve, then, the time shaft coordinate of a pressure change curve is wherein moved to left about 20% as left margin, the time shaft coordinate of this pressure change curve is moved to right about 20% as the right dividing value.
Particularly, can be with formula (2) to adjusted data, carrying out curve fitting obtains to alleviate the curve regions border.Calculate the pressure values of alleviating corresponding point on the curve regions border according to the sampling period of monitoring system and make the boundary curve table, what write down in this boundary curve table is exactly to alleviate the zone boundary.Required pressure change curved boundary condition data is stored in the boundary curve table, when real-time monitoring system starts the Zero calibration operation, relatively the regional edge dividing value in the boundary curve table determines whether the alleviation process is normal, whether real-time curve meets the requirement that triggers the Zero calibration operation, and judges the validity of calibration result.
(3) step 403
Whether the pressure values of judging checking cylinder reaches zero operation comprises: if the pressure values of checking cylinder reaches second predetermined pressure value, and the variation of the pressure values of checking cylinder surpasses the predetermined variation value in the given time, represents that then the pressure values of checking cylinder reaches zero point.Second predetermined pressure value here can be 20kpa, and the schedule time can be 1 minute.
Particularly, the major parameter of the feature of judgement checking cylinder pressure change curve comprises: the pressure values that reaches in the pressure of checking cylinder, the pressure decline process during alleviation and the tangent slope of pressure change curve.Be always decrement states when the pressure of checking cylinder is the tangent slope numerical value that as shown in Figure 3 curve drops to 20kpa and pressure change curve, can think that the alleviation process is normal, equalizing lever axial hole gas circuit is unobstructed.After pressure is stablized 1 minute, just can think that the pressure of checking cylinder has arrived zero point.
Above-mentioned 20kpa is the empirical value that obtains by the process data of observing a large amount of bus safety monitoring system registers.Because the range of the gas pressure sensor that native system is selected for use is 1MP (1000kPa), full warm area composition error is 0.25%, therefore, the error at pressure place at zero point should be greater than 2.5kPa, above-mentioned 20kpa is much larger than sensor nominal error numerical value, and therefore, this numerical value of 20kpa can not be subjected to the influence of error and can't measure, thereby the judgement that the pressure values of checking cylinder reaches zero point can be triggered by this numerical value of 20kpa.
(4) step 404
When the pressure of checking cylinder arrived zero point, the pressure values of the checking cylinder that can be obtained this moment was as modified value at accurate zero point, and then, pressure values and the pre-stored composite error nominal that obtained this moment compare, to verify the validity of modified value at this at accurate zero point.This pre-stored composite error nominal can be provided by gas pressure sensor supplier, is used to represent that this gas pressure sensor comprises the maximum error value of zero drift.
(5) step 405
When the pressure of checking cylinder arrives zero point, if this moment the checking cylinder that obtains pressure values (be accurate zero point modified value) smaller or equal to composite error nominal, represent that then this modified value effective at accurate zero point, can be used as the modified value at zero point, otherwise, abandon modified value at this at accurate zero point.
Generally speaking, in train travelling process, repeatedly braking-alleviation action can occur, demarcate the checking cylinder gas pressure sensor during zero point, utilize the above method of checking repeatedly of demarcating twice, can improve the reliability that automatic zero point is demarcated.Therefore, accuracy for data, generally can get modified value at two or three at accurate zero point, promptly, repeat above-mentioned steps 401-405 successively, obtain modified value at two or three, the mean value that can get any one numerical value (comprising numerical value minimum or numerical value maximum) in modified value at this or this modified value at several zero point as the modified value at zero point at several accurate zero point at effective accurate zero point.
(6) step 406
According to the modified value at zero point, to demarcating the zero point of gas pressure sensor.For example, zero point, modified value was 2kpa, represented that then the zero drift amount of gas pressure sensor is 2kpa, that is to say that the pressure of brake is at 0 o'clock, and the reading of gas pressure sensor is 2kpa.When the pressure of system log (SYSLOG) brake, only the reading of gas pressure sensor need be deducted 2kpa just can obtain the real pressure of brake.
By above description as can be seen, when checking cylinder is alleviated, the sampling of pressure values, in that pressure is stable when reaching zero point, with this moment the checking cylinder that obtains force value as the modified value at zero point, carry out the Zero calibration of gas pressure sensor with this, than the artificial demarcation of prior art, the embodiment of the invention is simple to operate and can reduce workload and calibration cost.
In order to understand the present invention better, be described below in conjunction with the detailed process of zero point calibration of gas pressure sensor method according to the embodiment of the invention shown in Figure 7.As shown in Figure 7, this flow process comprises:
Step 701 is provided with the checking cylinder pressure data table of FIFO mechanism, and this tables of data can be stored above checking cylinder pressure data in 20 seconds, and this operation can be finished in computer data acquisition system;
Step 702 is carried out the pressure collection of checking cylinder, and stores the checking cylinder pressure data of constant duration in tables of data, utilizes the checking cylinder pressure data and the known time interval, calculates the tangent slope of pressure change curve;
Step 703 is judged when whether checking cylinder pressure descends greater than 240kPa and with the speed greater than 30kpa/s, if, then carry out step 704, otherwise, step 702 returned;
Step 704 judges whether the tangent slope of pressure change curve successively decreases all the time, if, then proceed to step 705, otherwise, this demarcation abandoned;
Step 705 judges whether the pressure change curve exceeds alleviation curve regions border, if not, then proceeds to step 706, otherwise, abandon this demarcation;
Step 706 judges that whether pressure plant less than 20kpa, if then timer picks up counting, and proceeds to step 708, otherwise, proceed to step 707;
Step 707 continues the pressure sampling, and changes step 706 over to;
Whether step 708 judges timer timing 1 minute, if, then proceed to step 711, otherwise, proceed to step 709;
Step 709 continues the pressure sampling, and carry out step 710;
Step 710 judges whether pressure has fluctuation, if do not have, then returns step 708, otherwise, abandon this demarcation;
Whether step 712 judges above-mentioned new zero point modified value greater than composite error nominal, if it is undesired to represent that then checking cylinder is alleviated process, proceeds to step 713, otherwise, proceed to step 717;
Step 713 is abandoned new modified value at zero point, and carry out step 714;
Whether step 715, failure judgement Counter Value greater than 2, if, then carry out step 716, otherwise, step 702 returned;
Step 716 is sent the fault prompting that the pressure transducer zero drift transfinites, and is abandoned this demarcation;
Whether step 718 judges the Zero calibration Counter Value greater than 2, if, then carry out step 719, otherwise, step 702 returned;
Embodiment two
The embodiment of the invention also provides a kind of zero point calibration of gas pressure sensor device, and Fig. 8 is the structured flowchart of this device, and as shown in Figure 8, this device comprises:
First judging unit 2 is connected to pressure acquiring unit 1, is used for the moment and the pressure values of the pressure values obtained according to pressure acquiring unit 1, judges whether the process of alleviating is normal;
Comparing unit 4 is connected to the pressure acquiring unit 1 and second judging unit 3, is used for when second judging unit 3 judges that the pressure values of checking cylinder reaches zero pressure acquiring unit 1 current pressure values of obtaining and pre-stored composite error nominal being compared;
Zero point, the modified value determining unit 5, were connected to comparing unit 4, be used in the current pressure values of obtaining during smaller or equal to composite error nominal, with the current pressure values of obtaining as the modified value at zero point;
Zero calibration unit 6 is connected to modified value determining unit 5 at zero point, is used for the modified value at zero point that modified value determining unit 5 is determined according to zero point, to demarcating the zero point of gas pressure sensor.
By above description as can be seen, by when checking cylinder is alleviated, the pressure acquiring unit is sampled to the pressure values of checking cylinder, in that pressure is stable when reaching zero point, with this moment the checking cylinder that obtains force value as the modified value at zero point, carry out the Zero calibration of gas pressure sensor with this, than the artificial demarcation of prior art, the embodiment of the invention can reduce workload and calibration cost.
Particularly, this device can also comprise alleviation judging unit 7 shown in Figure 9 and storer 8, wherein:
Alleviate judging unit 7, be connected, be used to judge whether checking cylinder carries out the alleviation process with pressure acquiring unit 1.When alleviating process, pressure acquiring unit 1 begins moment of obtaining the pressure values of checking cylinder and obtaining pressure values in judged result.The condition that checking cylinder begins to alleviate is: the pressure values fall off rate that the pressure values of checking cylinder reaches predetermined pressure value and checking cylinder reaches set rate.Predetermined pressure value can be 240kpa, and set rate can be 30kPa/s, and the introduction that these two data are detailed can repeat no more here with reference to the associated description of the foregoing description.
Figure 10 a, 10b are two kinds of concrete structure block diagrams of above-mentioned first judging unit, below in conjunction with Figure 10 a, 10b first judging unit are described in detail.
Shown in Figure 10 a, first judging unit can comprise: condition judgment module 20 and effective range judge module 21, first judging unit of this structure are preferably used for realizing the method one in the above-mentioned steps 402, wherein:
Effective range judge module 21 is used for judging according to the moment and the pressure values of obtaining pressure values whether pressure values does not exceed the alleviation zone boundary that prestores all the time; Wherein, alleviate the effective range that the zone boundary is used to indicate the pressure values variation.
Shown in Figure 10 b, first judging unit also can comprise: computing module 22, condition judgment module 23 and effective coverage judge module 24, first judging unit of this structure are preferably used for realizing the method two in the above-mentioned steps 402, wherein:
Effective coverage judge module 24 is connected to condition judgment module 23, is used for when tangent slope numerical value is always decrement states, judges whether the pressure change curve is positioned at the alleviation curve regions border that prestores; Wherein, alleviate the effective range that the curve regions border is used to indicate the pressure change curve.
Above-mentioned alleviation zone boundary, alleviation curve regions border can repeat no more here with reference to the associated description of the foregoing description one.
Figure 11 is modified value determining unit 5 a concrete structure block diagram at above-mentioned zero point, and as shown in figure 11, this, modified value determining unit comprised at zero point:
Zero point, the modified value determination module 52, were connected to memory module 51, were used for any one numerical value (comprising minimum value or maximal value) of a plurality of current pressure values of obtaining of memory module storage or mean value as the modified value at zero point.
The concrete operating process of above-mentioned each unit, each module can repeat no more here with reference to the associated description in the foregoing description one.
In sum, the embodiment of the invention is utilized the alleviation principle of passenger vehicle 104 brakes, when checking cylinder is alleviated, the sampling of pressure values, in that pressure is stable when reaching zero point, the force value of the checking cylinder that obtains this moment as the modified value at zero point, is carried out the Zero calibration of gas pressure sensor with this, than the artificial demarcation of prior art, the embodiment of the invention is simple to operate and can reduce workload and calibration cost.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method can instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, such as ROM/RAM, magnetic disc, CD etc.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. a zero point calibration of gas pressure sensor method is characterized in that, described method comprises:
When checking cylinder is alleviated, obtain the pressure values of described checking cylinder;
According to the moment of obtaining described pressure values and described pressure values, judge whether the process of described alleviation is normal;
In the process of described alleviation just often, whether the pressure values of judging described checking cylinder reaches zero;
When the pressure values of described checking cylinder reaches zero, current pressure values of obtaining and pre-stored composite error nominal are compared;
In the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as the modified value at zero point;
According to modified value at described zero point, to demarcating the zero point of described gas pressure sensor.
2. method according to claim 1 is characterized in that, when satisfying following condition, described checking cylinder is alleviated:
The pressure values of described checking cylinder reaches first predetermined pressure value; And
The pressure values fall off rate of described checking cylinder reaches set rate.
3. method according to claim 1 is characterized in that, judges whether the process of described alleviation normally comprises:
According to the moment of obtaining described pressure values and described pressure values, judge whether described pressure values is always decrement states and whether does not exceed the alleviation zone boundary that prestores all the time;
If described pressure values is always decrement states and does not exceed described alleviation zone boundary all the time, then the process of described alleviation is normal;
Wherein, described alleviation zone boundary is used to the effective range of indicating pressure values to change.
4. method according to claim 1 is characterized in that, judges whether the process of described alleviation normally also comprises:
Tangent slope numerical value according to the moment of obtaining described pressure values and described pressure values calculating pressure change curve;
Judge whether described tangent slope numerical value is always decrement states;
When described tangent slope numerical value is always decrement states, judge whether described pressure change curve is positioned at alleviation curve regions border;
Alleviate the curve regions border if described pressure change curve is positioned at, then the process of described alleviation is normal;
Wherein, described alleviation curve regions border is used to indicate the effective range of pressure change curve.
5. method according to claim 4 is characterized in that, carries out the match of described pressure change curve by following formula:
y＝aX
3+bX
2+cX+d，
Wherein, X represents to obtain the moment of pressure values, and y represents pressure values, and a, b, c, d are rational number.
6. method according to claim 4 is characterized in that, described alleviation curve regions border comprises curve regions left margin and curve regions right margin, determines described curve regions left margin and described curve regions right margin in the following way:
According to the pressure values of the volume of checking cylinder and/or the checking cylinder that obtains, determine described pressure change curve;
With the time coordinate axle of the described pressure change curve curve that predetermined value obtains that moves to left, as described curve regions left margin;
With the time coordinate axle of the described pressure change curve curve that predetermined value obtains that moves to right, as described curve regions right margin.
7. method according to claim 1 is characterized in that, whether the pressure values of judging described checking cylinder reaches zero comprises:
If the pressure values of described checking cylinder reaches second predetermined pressure value, and the variation of the pressure values of described checking cylinder does not surpass the predetermined variation value in the given time, and then the pressure values of described checking cylinder reaches zero.
8. method according to claim 1 is characterized in that, in the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as zero point modified value comprise:
During smaller or equal to described composite error nominal, store the described current pressure values of obtaining in the described current pressure values of obtaining;
Alleviate once more at described checking cylinder, and the process of alleviating just often, when the pressure values of described checking cylinder reaches zero, obtain and store another current pressure values of obtaining;
With the mean value of a plurality of current pressure values of obtaining of any one or storage in a plurality of current pressure values of obtaining of storage as modified value at described zero point.
9. method according to claim 1 is characterized in that, described the current pressure values of obtaining and pre-stored composite error nominal are compared after, described method also comprises:
During greater than described composite error nominal, abandon the described current pressure values of obtaining in the described current pressure values of obtaining.
10. a zero point calibration of gas pressure sensor device is characterized in that, described device comprises:
The pressure acquiring unit is used to the moment of obtaining the pressure values of checking cylinder and obtaining described pressure values;
First judging unit is used for judging according to the moment and the described pressure values of obtaining described pressure values whether the process of described alleviation is normal;
Second judging unit is used in the process of described alleviation just often, judges whether the pressure values of described checking cylinder reaches zero;
Comparing unit is used for when the pressure values of the described checking cylinder of described second judgment unit judges reaches zero current pressure values of obtaining of described pressure acquiring unit and pre-stored composite error nominal being compared;
Zero point, the modified value determining unit was used in the described current pressure values of obtaining during smaller or equal to described composite error nominal, with the described current pressure values of obtaining as the modified value at zero point;
The Zero calibration unit is used for according to the described modified value at zero point that zero point, the modified value determining unit was determined, to demarcating the zero point of described gas pressure sensor.
11. device according to claim 10 is characterized in that, described device also comprises:
Alleviate judging unit, be used to judge whether described checking cylinder carries out the alleviation process.
12. device according to claim 10 is characterized in that, described first judging unit comprises:
Condition judgment module is used for judging according to the moment and the described pressure values of obtaining described pressure values whether described pressure values is always decrement states;
The effective range judge module is used for judging according to the moment and the described pressure values of obtaining described pressure values whether described pressure values does not exceed the alleviation zone boundary that prestores all the time;
Wherein, described alleviation zone boundary is used to the effective range of indicating pressure values to change.
13. device according to claim 10 is characterized in that, described first judging unit comprises:
Computing module is used for according to the tangent slope numerical value that obtains the moment of described pressure values, described pressure values calculating pressure change curve;
Condition judgment module is used to judge whether described tangent slope numerical value is always decrement states;
The effective coverage judge module is used for when described tangent slope numerical value is always decrement states, judges whether described pressure change curve is positioned at the alleviation curve regions border that prestores;
Wherein, described alleviation curve regions border is used to indicate the effective range of pressure change curve.
14. device according to claim 10 is characterized in that, described zero point, the modified value determining unit comprised:
Control module is used to dispatch described pressure acquiring unit, described first judging unit, described second judging unit, described comparing unit, to obtain a plurality of described current pressure values of obtaining;
Memory module is used to store a plurality of described current pressure values of obtaining;
Zero point, the modified value determination module was used for any one or mean value of a plurality of described current pressure values of obtaining of described memory module storage as modified value at described zero point.
15., it is characterized in that described device also comprises according to each described device in the claim 10 to 14:
Storer is used to store the moment and the described pressure values of the described pressure values that described pressure acquiring unit obtains.
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| CN200910092600A CN101655406A (en) | 2009-09-11 | 2009-09-11 | Method and device for zero point calibration of gas pressure sensor |
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| CN200910092600A CN101655406A (en) | 2009-09-11 | 2009-09-11 | Method and device for zero point calibration of gas pressure sensor |
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| CN102145689A (en) * | 2011-02-14 | 2011-08-10 | 中国铁道科学研究院机车车辆研究所 | Detecting method and device for failure of automatic air brake system of train |
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