CN117760585A - Temperature estimation and fault diagnosis method for temperature sensor of inflating pump of air spring system - Google Patents
Temperature estimation and fault diagnosis method for temperature sensor of inflating pump of air spring system Download PDFInfo
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- CN117760585A CN117760585A CN202311786342.6A CN202311786342A CN117760585A CN 117760585 A CN117760585 A CN 117760585A CN 202311786342 A CN202311786342 A CN 202311786342A CN 117760585 A CN117760585 A CN 117760585A
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- temperature sensor
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- air spring
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003745 diagnosis Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000007613 environmental effect Effects 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 6
- 238000011217 control strategy Methods 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000000725 suspension Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a temperature estimation and fault diagnosis method for a temperature sensor of an inflating pump of an air spring system, which relates to the technical field of chassis suspension control and comprises the following steps: s1, confirming the measured temperature ranges Ta-Tb under the current pull-up resistor; s2, establishing an inflation pump thermal model by measuring the temperature rise and the temperature drop rate of the inflation pump working under different environmental temperatures: s3, powering up the controller, and detecting whether the temperature measured by the temperature sensor is in a trusted range (Ta-Tb); s4, judging whether the temperature measured by the detection temperature sensor is in a temperature range Ta-Tb. The invention utilizes the accurate temperature estimation and accurate fault diagnosis, avoids the panic of drivers caused by false alarm faults, and avoids the burning of the inflation pump caused by failure in reporting.
Description
Technical Field
The invention relates to the technical field of chassis suspension control, in particular to a temperature estimation and fault diagnosis method for a temperature sensor of an inflating pump of an air spring system.
Background
In the air spring system, the inflating pump is a main part and is responsible for the establishment of the pressure of the whole air spring system, the temperature of the inflating pump rises faster during working, the overheat burning of the inflating pump is easy to cause, and the temperature sensor used for the inflating pump has a large resistance and a wide temperature measuring range because the working temperature of the inflating pump is wide (-40 ℃ to 250 ℃), so that the requirement on a temperature sampling circuit is higher.
At present, most temperature sampling circuits adopt a 5V pull-up circuit to measure an accessed NTC resistor, the low temperature area and the high temperature area of the circuit are not easy to measure accurately, the measured voltage change corresponding to the larger temperature change is very small, and the open-circuit voltage of a temperature sensor and the measured voltage of the low temperature are indistinguishable (the measured voltage of the low temperature area is close to 5V), so that the faults of the open-circuit and the short-circuit of the temperature sensor to a power supply cannot be diagnosed, and if the temperature sensor is open-circuit, the faults cannot be diagnosed, and the temperature of an inflating pump is too high to burn. The invention thus proposes a method for temperature estimation and fault diagnosis of a temperature sensor of an air pump of an air spring system.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the problems of inaccurate measurement and difficult fault diagnosis in a high-low temperature interval, and provides a temperature estimation and fault diagnosis method for a temperature sensor of an inflating pump of an air spring system.
Technical proposal
In order to achieve the above purpose, the present invention provides the following technical solutions: the temperature estimation method of the inflating pump temperature sensor of the air spring system is characterized by comprising the following steps of: the method comprises the following steps:
s1, confirming the measured temperature ranges Ta-Tb under the current pull-up resistor;
s2, establishing an inflation pump thermal model by measuring the temperature rise and the temperature drop rate of the inflation pump working under different environmental temperatures:
T p ＝T old +ΔT inc ·P+(1-P)ΔT dec ；
s3, powering up the controller, and detecting whether the temperature measured by the temperature sensor is in a trusted range (Ta-Tb);
s4, judging whether the temperature measured by the detection temperature sensor is in a temperature range Ta-Tb, and if the temperature measured by the detection temperature sensor is in the temperature range Ta-Tb, estimating the temperature to be the same as the actual test temperature; if the temperature detected by the temperature sensor is not within the temperature range Ta-Tb, the time t of ending the last driving cycle stored by the controller is used off And calculating the current temperature by the temperature Ttppre before ending, and correcting the estimated temperature once the air pump is started and the temperature enters the trusted interval.
Fault diagnosis method based on air spring system inflating pump temperature sensor estimation method, wherein the estimated temperature Tp is greater than the actual sampling temperature Tm, and the difference exceeds delta T tbd If the suspected fault error is judged to be 1, after the air pump control module receives the error error=1, the air pump is started by combining with a control strategy, and when Tp-Tm>ΔT cfm (ΔT cfm >ΔT tbd ) When error status = 2 failure confirmation.
Preferably, said T p To estimate the temperature, T old As a result of the calculation in the previous calculation cycle, P is the pump-on state, pump-on p=1, pump-off p=0.
Preferably, the DeltaT inc The temperature rise rate of the inflating pump at different ambient temperatures is obtained through temperature rise tests at different ambient temperatures.
Preferably, the DeltaT dec The temperature drop rate of the air pump at different ambient temperatures after the air pump is closed is obtained through temperature drop tests at different ambient temperatures.
The beneficial effects are that:
compared with the prior art, the temperature estimation and fault diagnosis method for the temperature sensor of the inflating pump of the air spring system has the following beneficial effects:
1. the invention has accurate temperature estimation and accurate fault diagnosis, avoids the panic of drivers caused by false alarm faults, and also avoids the burning of the inflation pump caused by failure.
2. According to the invention, when the sensor specification is changed, the hardware circuit of the temperature sensor does not need to be matched and changed again, so that the cost brought by the test and hardware change is reduced.
Drawings
FIG. 1 is a flow chart of a temperature estimation method of a temperature sensor according to the present invention;
FIG. 2 is a flow chart of a temperature sensor fault diagnosis method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the present invention provides a technical solution: the temperature estimation method of the inflating pump temperature sensor of the air spring system comprises the following steps: s1, aiming at the existing hardware scheme, confirming the measured temperature ranges Ta-Tb under the current pull-up resistance; s2, establishing an inflation pump thermal model by measuring the temperature rise and the temperature drop rate of the inflation pump working under different environmental temperatures:
T p ＝T old +ΔT inc ·P+(1-P)ΔT dec ；
based on the thermal model of the inflation pump, the temperature sensor temperature estimation method comprises the following steps: powering up the controller, and detecting whether the temperature measured by the temperature sensor is in a trusted range (Ta-Tb); if the temperature measured by the detection temperature sensor is within the temperature range Ta-Tb, the estimated temperature is the same as the actual test temperature; if the temperature detected by the temperature sensor is not within the temperature range Ta-Tb, the time t of ending the last driving cycle stored by the controller is used off And calculating the current temperature by the temperature Ttppre before ending, and correcting the estimated temperature once the air pump is started and the temperature enters the trusted interval.
Wherein T in the present application p To estimate the temperature, T old For the calculation result of the previous calculation period, P is the pumping-on state, pumping-on p=1, pumping-off p=0, Δt inc For the temperature rising rate under different environment temperatures when the inflating pump is started, the delta T is obtained through temperature rising tests under different environment temperatures dec The temperature drop rate of the air pump at different ambient temperatures after the air pump is closed is obtained through temperature drop tests at different ambient temperatures.
Based on the thermal model of the inflation pump, the fault diagnosis method of the temperature sensor is as follows: the estimated temperature Tp is greater than the actual sampling temperature Tm and the difference exceeds DeltaT tbd If the suspected fault error is judged to be 1, after the air pump control module receives the error error=1, the air pump is started by combining with a control strategy, and when Tp-Tm>ΔT cfm (ΔT cfm >ΔT tbd ) When error status = 2 failure confirmation.
In summary, on the basis of not changing the existing hardware scheme, the invention carries out temperature estimation and fault diagnosis by establishing the thermal model of the inflating pump and adopting the scheme of combining the hardware sampling circuit with the inflating pump control strategy, thereby utilizing the accurate temperature estimation and the accurate fault diagnosis, avoiding the panic of a driver caused by false alarm fault and avoiding the burning of the inflating pump caused by failure reporting.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The temperature estimation method of the inflating pump temperature sensor of the air spring system is characterized by comprising the following steps of: the method comprises the following steps:
s1, confirming the measured temperature ranges Ta-Tb under the current pull-up resistor;
s2, establishing an inflation pump thermal model by measuring the temperature rise and the temperature drop rate of the inflation pump working under different environmental temperatures:
T p ＝T old +ΔT inc ·P+(1-P)ΔT dec ；
s3, powering up the controller, and detecting whether the temperature measured by the temperature sensor is in a temperature range Ta-Tb;
s4, if the temperature measured by the detection temperature sensor is within the temperature range Ta-Tb, the estimated temperature is the same as the actual test temperature; if the temperature detected by the temperature sensor is not within the temperature range Ta-Tb, the time t of ending the last driving cycle stored by the controller is used off And calculating the current temperature by the temperature Ttppre before ending, and correcting the estimated temperature once the air pump is started and the temperature enters the trusted interval.
2. The fault diagnosis method based on the air spring system inflating pump temperature sensor estimation method of claim 1, characterized in that:
the estimated temperature Tp is greater than the actual sampling temperature Tm and the difference exceeds DeltaT tbd If the suspected fault error is judged to be 1, after the air pump control module receives the error error=1, the air pump is started by combining with a control strategy, and when Tp-Tm>ΔT cfm (ΔT cfm >ΔT tbd ) When error status = 2 failure confirmation.
3. The method for estimating a temperature of a temperature sensor of an air spring system inflation pump of claim 1, wherein: the T is p To estimate the temperature, T ol d is the calculation result of the previous calculation cycle, P is the pumping-on state, pumping-on p=1, pumping-off p=0.
4. A method for temperature estimation and fault diagnosis of an air spring system inflation pump temperature sensor according to claim 3, wherein: said DeltaT inc For the temperature rising speed under different environment temperatures when the inflating pump is startedThe rate is obtained by temperature rise tests at different ambient temperatures.
5. The method for estimating and diagnosing a temperature of a temperature sensor of an air spring system according to claim 4, wherein: said DeltaT dec The temperature drop rate of the air pump at different ambient temperatures after the air pump is closed is obtained through temperature drop tests at different ambient temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311786342.6A CN117760585A (en) | 2023-12-25 | 2023-12-25 | Temperature estimation and fault diagnosis method for temperature sensor of inflating pump of air spring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311786342.6A CN117760585A (en) | 2023-12-25 | 2023-12-25 | Temperature estimation and fault diagnosis method for temperature sensor of inflating pump of air spring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117760585A true CN117760585A (en) | 2024-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311786342.6A Pending CN117760585A (en) | 2023-12-25 | 2023-12-25 | Temperature estimation and fault diagnosis method for temperature sensor of inflating pump of air spring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117760585A (en) |
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2023
- 2023-12-25 CN CN202311786342.6A patent/CN117760585A/en active Pending
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