CN116907871A - Method, device, equipment and storage medium for detecting abnormality of automobile cooling circuit - Google Patents
Method, device, equipment and storage medium for detecting abnormality of automobile cooling circuit Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001816 cooling Methods 0.000 title claims abstract description 36
- 230000005856 abnormality Effects 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 43
- 239000000110 cooling liquid Substances 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000004590 computer program Methods 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 13
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 239000002826 coolant Substances 0.000 description 12
- 230000033228 biological regulation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The application relates to an abnormality detection method, device, equipment and storage medium for an automobile cooling loop, wherein the method comprises the steps of obtaining a quadrature axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop; the quadrature axis current value is subjected to low-pass filtering according to a first cut-off frequency, and a low-pass processing value is obtained; acquiring a quadrature current average value of the pump according to the low-pass processing value in the target duration; carrying out high-pass filtering on the quadrature current value according to a second cut-off frequency to obtain a high-pass processing value; acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value; judging whether the quadrature current difference value is larger than or equal to a range threshold value, if so, executing a bubble removal instruction, and adopting the method of the application can solve the problem of untimely bubble removal in the prior art.
Description
Technical Field
The present application relates to the field of automotive technologies, and in particular, to a method, an apparatus, a device, and a storage medium for detecting an abnormality of an automotive cooling circuit.
Background
The cooling system is an important component of the automobile power assembly, is responsible for temperature regulation and control of the fuel engine in a traditional automobile, ensures that the fuel engine works in a proper temperature range, and in a new energy automobile, power devices such as a battery, a motor controller, a charger and the like all need to be cooled, so that the cooling system of the electric automobile becomes more complex.
When the cooling liquid circulates in the loop, air can be mixed into the cooling liquid to generate bubbles, and the bubbles appear in the cooling liquid of the automobile, so that a plurality of hazards can be caused: the heat dissipation capacity decreases, resulting in an increase in temperature of the engine, electrical components, and even overheating; the bubbles may cause air pressure fluctuation in the coolant to form bubble impact, thereby generating vortex and impact force, causing abrasion of the metal surface, and the like.
Therefore, bubbles in the automobile cooling liquid need to be treated in time, but bubbles in a loop are difficult to detect, and timeliness of bubble treatment is difficult to ensure.
Disclosure of Invention
Based on the method, the device, the equipment and the storage medium for detecting the abnormality of the cooling circuit of the automobile are provided, and the problem that bubbles are not removed timely in the prior art is solved.
In one aspect, a method for detecting an abnormality of a cooling circuit of an automobile is provided, the method comprising:
acquiring a quadrature axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the quadrature axis current value is subjected to low-pass filtering according to a first cut-off frequency, and a low-pass processing value is obtained;
acquiring a quadrature current average value of the pump according to the low-pass processing value in the target duration;
carrying out high-pass filtering on the quadrature current value according to a second cut-off frequency to obtain a high-pass processing value;
acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
judging whether the quadrature current difference value is larger than or equal to a range threshold value, if so, determining that bubbles exist in the automobile cooling liquid loop to execute a bubble removal instruction.
In one embodiment, after the obtaining the quadrature current difference value, the method further includes:
acquiring the rotating speed of the pump;
determining a quadrature current reference value of the pump from a reference corresponding relation according to the rotating speed;
determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value;
and when the quadrature current deviation value is greater than or equal to a deviation threshold value and the quadrature current deviation value is greater than or equal to a range threshold value, determining that the automobile cooling liquid loop leaks so as to execute a shutdown instruction of the pump.
In one embodiment, the acquiring the quadrature current value of the pump includes:
acquiring phase current values of three phases of the pump;
converting the phase current according to a first mathematical expression to obtain a current component in a two-phase stationary coordinate system, wherein the first mathematical expression is as follows:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively I α 、I β Two-phase current components under a two-phase static coordinate system respectively;
converting the current components in the two-phase static coordinate system according to a second mathematical expression to obtain a quadrature current value in the two-phase rotating coordinate system, wherein the second mathematical expression is as follows:
wherein I is q And theta is the phase angle for the quadrature current value.
In one embodiment, the executing bubble removal instructions comprises:
and controlling the operation of the pump according to a preset exhaust rotating speed so that the cooling liquid flows through an exhaust device on the automobile cooling liquid loop.
In one embodiment, after the determining the quadrature current bias value, the method further includes:
when the quadrature current deviation value is smaller than the range threshold, and the quadrature current deviation value is smaller than the deviation threshold, the rotating speed of the pump is increased in a gradient mode, and the quadrature current deviation value corresponding to each gradient rotating speed is obtained;
and when the quadrature axis current deviation value is determined to be greater than or equal to a deviation threshold value, determining the corresponding gradient rotating speed as a rotating speed extremum so as to control the rotating speed of the pump to be less than the rotating speed extremum when the pump is operated.
In one embodiment, the gradient increases the rotational speed of the pump, comprising:
and determining gradient increment according to the accumulated driving distance of the automobile and/or the historical rotating speed of the pump, wherein the gradient increment and the accumulated driving distance form a negative correlation, and the gradient increment and the historical rotating speed of the pump form a negative correlation.
In still another aspect, there is provided an abnormality detection apparatus for an automotive cooling circuit, the apparatus including:
the acquisition module is used for acquiring the quadrature axis current value of the pump, and the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the calculating module is used for carrying out low-pass filtering on the quadrature axis current value according to the first cut-off frequency to obtain a low-pass processing value; the method is also used for obtaining the quadrature current average value of the pump according to the low-pass processing value in the target duration; the high-pass filter is further used for carrying out high-pass filtering on the quadrature axis current value according to a second cut-off frequency to obtain a high-pass processing value; acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
the judging module is used for judging whether the quadrature current difference value is larger than or equal to a range threshold value;
and the execution module is used for executing the bubble removal instruction when the quadrature current difference value is greater than or equal to the range threshold value.
In yet another aspect, a computer apparatus is provided comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when the computer program is executed.
There is also provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method.
According to the automobile cooling circuit abnormality detection method, the device, the computer equipment and the storage medium, the intersecting axis current value is monitored, low-pass filtering is carried out on the intersecting axis current value, so that the intersecting axis current average value which can represent the steady state of the pump is calculated, high-pass filtering is carried out on the intersecting axis current value, a high-pass processing value is calculated, the intersecting axis current difference value is obtained according to the difference value between the intersecting axis current average value and the high-pass processing value, when the intersecting axis current difference value reaches or exceeds the range threshold, the bubble impact pump can be considered to exist, and therefore a bubble removal strategy is started.
Drawings
FIG. 1 is a flow chart of a method for detecting an anomaly in a cooling circuit of an automobile according to one embodiment;
FIG. 2 is a schematic flow chart of judging leakage of cooling liquid in one embodiment;
FIG. 3 is a flow chart of an abnormality detection method for an automotive cooling circuit according to another embodiment;
FIG. 4 is a schematic diagram showing the correspondence between the quadrature current and the pump speed in one embodiment;
FIG. 5 is a block diagram showing a configuration of an abnormality detection device for a cooling circuit of an automobile in one embodiment;
fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The automobile cooling system realizing temperature control by using the cooling liquid is an important component part in the automobile, and the cooling liquid in the new energy automobile is used as a heat transfer medium to cool parts such as a power battery, a driving motor, a charger and the like, so that the parts are ensured to work within a safe temperature range. When bubbles are mixed in the cooling liquid, the heat dissipation function of the component is affected. In order to reduce this risk and ensure proper operation of the vehicle, it is necessary to detect and exclude the presence or absence of air bubbles in the coolant.
The method for detecting the abnormality of the cooling circuit of the automobile, as shown in figure 1, comprises the following steps of
And 101, acquiring a quadrature current value of the pump.
It can be understood that the pump is a three-phase driving pump arranged on the cooling liquid loop of the automobile, and the controller of the pump controls the pump to work according to a stable rotating speed so as to drive the cooling liquid to flow through the target parts along the cooling liquid loop.
In the cooling system of the new energy automobile, the pump can be driven by the phase currents of the a, b and c phases, the phase currents of the a, b and c phases are monitored in real time, and the phase currents of the three phases can be converted into a two-phase static coordinate system according to the following first mathematical expression:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively.
And then the two-phase current component I under the two-phase static coordinate system α 、I β Down-converting to two-phase rotation coordinate system according to the second mathematical expression to obtain quadrature current value I under two-phase rotation coordinate system q Direct axis current value I d The second mathematical expression is:
and θ is the phase angle of the motor rotor in the pump.
The direct axis current is excitation current, the quadrature axis current is torque current, and when bubbles pass through the pump, bubble impact influences the quadrature axis current.
And 102, performing low-pass filtering on the quadrature current value.
Illustratively, the quadrature current values within one governor period are filtered using a low pass filter having a cut-off frequency that is a first cut-off frequency.
The low-pass filtered quadrature current value is subjected to continuous recording within a certain time of history, and the high-frequency noise influence is eliminated.
And step 103, obtaining the quadrature current average value of the pump according to the low-pass processing value in the target duration.
It can be understood that the target duration may be determined according to design requirements, in this embodiment, the target duration is a speed regulation period, and the pump operates at a fixed rotation speed in the period, so that the low-pass processing value in the target duration is a stable value in an ideal state, which can reflect the steady state performance of the pump, and the quadrature current average value can be obtained by dividing the integrated low-pass processing value by the target duration.
And 104, performing high-pass filtering on the quadrature axis current value.
Illustratively, the quadrature current values within one governor period are filtered using a high pass filter having a cut-off frequency that is a second cut-off frequency.
The cross-axis current value through the high-pass filter has suppressed the low-frequency influence, and the cross-axis current influence caused by the bubble impact is manifested.
In some embodiments, the first cut-off frequency is less than or equal to 2 hz, preferably, for example, 1 hz, and under the low-pass filtering treatment of the cut-off frequency of 1 hz, the noise of the quadrature current can be accurately removed, and the interference of the bubble impact on the mean value calculation is reduced.
In another embodiment, the second cutoff frequency is greater than or equal to 35 hz, and a preferred value is, for example, 40 hz, and the cross-axis current fluctuation caused by the bubble impact can be accurately preserved under the high-pass filtering treatment with the cutoff frequency of 40 hz.
And 105, obtaining a quadrature current difference value according to the quadrature current average value and the high-pass processing value.
It is understood that the quadrature current margin value may be a difference between a maximum value of the high-pass processing value and a quadrature current average value within a target period (one speed regulation period), or a difference between a minimum value of the high-pass processing value and the quadrature current average value.
Pressure fluctuations cause the occurrence of quadrature current limit values as the bubble impinges through the portion of the pipeline in which the pump is located.
And step 106, judging whether the quadrature current difference value is greater than or equal to a range threshold, and if so, executing a bubble removal instruction.
Illustratively, the margin threshold may be obtained from a calibration, a typical value of which is, for example, 0.5A.
The bubble removal instructions may include activating an exhaust located on the coolant circuit, sending a prompt to the driver, etc.
By adopting the method for detecting the abnormality of the automobile cooling loop, whether bubbles exist in the cooling liquid loop can be monitored by monitoring and calculating the quadrature axis current value of the pump, the method can be realized at low cost, the method is simple, the existence of the bubbles can be found in time, and the bubble elimination strategy is started, so that the timeliness of bubble elimination is improved.
As an implementation of the above embodiment, when the presence of bubbles is detected, the next speed regulation cycle forces the rotational speed of the pump to a preset exhaust rotational speed, for example 6000rpm, and holds for a certain period of time, and at high rotational speeds, the coolant is caused to rapidly flow through an exhaust device, for example a coolant tank, on the car coolant circuit.
The mode directly forces the pump to operate according to the maximum rotation speed, and the problem of high energy consumption can be caused for the electric automobile.
In another embodiment, the exhaust speed is determined based on the quadrature current margin value, and in general, the greater the quadrature current margin value, the greater the exhaust speed; the smaller the quadrature current difference value is, the smaller the exhaust rotating speed is, the corresponding relation between the quadrature current difference value and the exhaust rotating speed can be determined based on real vehicle calibration and stored for direct calling.
The exhaust rotational speed is generally greater than the current rotational speed, and by increasing the rotational speed to begin bubble removal, as an alternative embodiment, the rotational speed increase Δn may be determined from the quadrature current limit value, the greater the rotational speed increase Δn; the smaller the quadrature current difference value is, the smaller the rotational speed increment delta n is, and the corresponding relation between the quadrature current difference value and the rotational speed increment delta n can be determined based on real vehicle calibration, and the rotational speed increment delta n is added on the basis of the current rotational speed to serve as the exhaust rotational speed after the rotational speed increment delta n is determined based on the quadrature current difference value.
As a more serious fault, whether the cooling liquid leaks or not requires the vehicle-machine system to pay more cost for monitoring and identification.
As an embodiment mode of the above embodiment, the present application realizes liquid leakage detection on the basis of bubble detection.
Illustratively, as shown in fig. 2, after obtaining the quadrature current difference value, the method further includes:
step 201, obtaining the rotating speed of the pump.
In this embodiment, the slip-form observer is used to calculate the pump speed in the current speed regulation cycle.
And 202, determining a quadrature current reference value of the pump from the reference corresponding relation according to the rotating speed.
It will be appreciated that the reference correspondence may be obtained by testing under calibration, as exemplified below:
firstly, a real vehicle cooling loop bench is built, 12L of cooling liquid is filled and exhausted, and no bubbles in a pipeline are ensured.
Setting the working rotating speed of the pump to 1000rpm, and collecting the phase current values of a, b and c three phases of the current pump.
And carrying out coordinate transformation on the phase current values of the a, b and c three phases according to the first mathematical expression and the second mathematical expression, and further obtaining a quadrature axis current reference value at the rotating speed of 1000 rpm.
And repeating the above processes at different working speeds to obtain the reference corresponding relation of the speed and the quadrature current, storing the reference corresponding relation, and obtaining the corresponding quadrature current reference value according to the speed inquiry in the real vehicle.
And 203, determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value.
It is understood that the mean value of the quadrature current coincides with or deviates little from the reference value of the quadrature current without leakage.
In practical implementation, the leakage causes pressure change in the cooling liquid loop, and possibly air bubbles, and causes change of the average value of the quadrature current in one speed regulation period, and deviation of the average value of the quadrature current from a quadrature current reference value is increased.
In step 204, the magnitudes of the quadrature current deviation value and the difference value are determined, and it is generally considered that when the quadrature current deviation value is greater than or equal to the deviation threshold value, the existence of the leakage is determined, and in this embodiment, when two conditions of the overlarge deviation and the existence of the bubbles in the loop are simultaneously established, the two conditions are used as the precondition for executing the leakage processing strategy, so that when the quadrature current deviation value is greater than or equal to the deviation threshold value, and the quadrature current difference value is greater than or equal to the difference threshold value, a shutdown instruction of the pump is executed.
Illustratively, the deviation threshold may be a pre-calibrated ratio value, such as 10% of the quadrature current reference value, and the coolant leakage is identified when the quadrature current average value and the quadrature current reference value differ by even more than 10% and the quadrature current differential value reaches even more than 0.5A, and the pump is shut down.
In fig. 3, a flow chart of monitoring whether bubbles exist in the coolant loop or not according to the quadrature current is shown, in the flow chart, whether bubbles exist is firstly judged according to the magnitude of the quadrature current difference value, if yes, the rotation speed of the pump is forcedly increased to forcedly discharge the bubbles, after a certain period of time, for example 30s, the rotation speed before forcedly discharging is restored again, and the position of the forcedly discharging mark is enabled, so that the bubbles are discharged once.
If the value of the cross current is continuously monitored to be greater than or equal to the range threshold, the rotating speed of the pump is further monitored, whether the value of the cross current deviation is greater than or equal to the deviation threshold is determined based on the cross current reference value and the cross current average value corresponding to the rotating speed, and if the value of the cross current deviation is greater than or equal to the deviation threshold, the pump is stopped.
The method for detecting the abnormality of the automobile cooling loop can be applied to the operation process of the pump to realize the detection and treatment of sudden liquid leakage and bubble impact, and the application also provides a self-checking strategy for the automobile cooling loop after the pump is started, which comprises the following steps:
when the pump is started, the pump is kept to run at a lower rotating speed (namely a predefined self-checking rotating speed, generally the starting rotating speed of the pump), whether bubbles or liquid leakage exists is detected according to the method, and when the cross current deviation value is smaller than the deviation threshold value and the cross current deviation value is smaller than the range threshold value, the situation that no bubbles or liquid leakage exists at the self-checking rotating speed can be considered.
And then gradient increasing the rotating speed of the pump, obtaining the average value of the intersecting-axis currents at each gradient rotating speed, solving the intersecting-axis current deviation value at each gradient rotating speed, determining the corresponding gradient rotating speed as a rotating speed extremum when the intersecting-axis current deviation value is larger than or equal to a deviation threshold value, and keeping the rotating speed of the pump below the rotating speed extremum in the following operation process.
It can be understood that the self-checking strategy can detect the hidden leakage risk of the automobile coolant loop, as shown in the reference correspondence schematic diagram of fig. 4, the horizontal axis represents the rotation speed range of the pump, the vertical axis represents the cross current range, the line a represents the cross current reference value corresponding to the rotation speed, the area S is the cross current reasonable range determined according to the cross current reference value and the deviation threshold, and the line B is the cross current average value corresponding to each gradient rotation speed when the rotation speed gradient increases.
When the rotation speed of the pump is below Nmax, the average value of the cross-axis currents is in a reasonable range, and when the average value of the cross-axis currents exceeds the reasonable range, the automobile coolant loop can be considered to be subject to some potential influences, such as reduced performance of sealing elements and reduced bearing capacity caused by ageing of pipeline interfaces, and when the pump runs at a low speed, the potential influences are small, but when the high-speed running and the flow rate are increased, the safety risk exists. When the potential risk is found, the rotation speed of the pump is limited, and the user can be informed timely.
In the self-checking strategy, the rotating speed is increased according to the gradient, so that the self-checking can be completed in a longer time.
For example, the gradient increment is determined according to the accumulated driving distance of the automobile, and the shorter the accumulated driving distance is, the lower the potential risk exists in the cooling liquid loop of the automobile, so that the gradient increment adopts a larger value, and the self-checking duration is shortened.
For example, the gradient increment is determined according to the historical rotation speed of the pump, the higher the historical rotation speed is, the higher the potential risk is caused when the automobile coolant loop works in a high-load state, so that a more accurate self-checking result is obtained by adopting a lower gradient increment, otherwise, the higher gradient increment can be adopted, and the self-checking duration is shortened.
Illustratively, when the rotational speed gradient of the pump increases, the gradient increase h is determined according to the following mathematical expression:
wherein D is the accumulated driving distance of the vehicle in 0-T time, n is the rotating speed of the pump in 0-T time, n 0 For the speed reference value of the pump, the general speed of the pump of most vehicles is represented, which can be used for calibrating the length of the same type of vehicle under the condition of vehicleAcquisition of phase test, H 0 For the base step obtained by calibration, typical values thereof are, for example, 1000 revolutions/S, θ 1 、θ 2 For adjusting the coefficients, different vehicle types can have different values, and the values can be obtained through real vehicle calibration and are positive values.
Based on the mathematical expression, when the vehicle driving distance is short and the pump is not running much, the potential risk of the cooling liquid loop is small, and the gradient increment is large at the moment, so that the self-checking process can be completed quickly; along with the increase of the driving distance or the long-term higher than the common rotating speed of the pump, the gradient increment is gradually reduced, the self-checking process is prolonged, and a more accurate self-checking result is obtained.
It is understood that the 0-T time is understood to be the time period from the previous maintenance of the coolant circuit of the vehicle to the current time, and the gradient increment is reset for each maintenance, and it should be noted that the mathematical expression is required to be activated after the vehicle has traveled a certain distance, and the vehicle pump may be activated according to a larger gradient increment (e.g., H 0 ) A gradient increase is performed.
It should be understood that, although the steps in the flowcharts of fig. 1-3 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur in sequence, but may be performed alternately or alternately with at least a portion of the other steps or sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided an abnormality detection device for a cooling circuit of an automobile, comprising: an acquisition module 301, a calculation module 302, a judgment module 303 and an execution module 304, wherein:
the acquisition module 301 is configured to acquire a quadrature current value of a pump, where the pump is a three-phase driving pump disposed on a cooling liquid circuit of an automobile;
the calculation module 302 is configured to perform low-pass filtering on the quadrature axis current value according to a first cut-off frequency, so as to obtain a low-pass processing value; the method is also used for obtaining the quadrature current average value of the pump according to the low-pass processing value in the target duration; the high-pass filter is further used for carrying out high-pass filtering on the quadrature axis current value according to a second cut-off frequency to obtain a high-pass processing value; acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
a judging module 303, configured to judge whether the quadrature current margin value is greater than or equal to a margin threshold;
and the execution module 304 is configured to execute a bubble removal instruction when the quadrature current margin value is greater than or equal to a range threshold.
According to the automobile cooling circuit abnormality detection device, the intersecting axis current value of the pump is monitored, low-pass filtering is carried out on the intersecting axis current value, so that the intersecting axis current average value which can represent the steady state of the pump is calculated, high-pass filtering is carried out on the intersecting axis current value, a high-pass processing value is calculated, the intersecting axis current difference value is obtained according to the difference value between the intersecting axis current average value and the high-pass processing value, when the intersecting axis current difference value reaches or exceeds the range threshold value, the pump is considered to be impacted by air bubbles, and therefore an air bubble removal strategy is started.
In one embodiment, the obtaining module 301 is further configured to obtain a rotation speed of the pump, for example, obtain the rotation speed by using a sliding film observer, and the calculating module 302 is further configured to determine a quadrature current reference value of the pump from a reference correspondence according to the rotation speed; further, determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value; the judging module 303 is further configured to judge whether the quadrature current deviation value is greater than or equal to a deviation threshold, and if yes, and if the quadrature current deviation value is greater than or equal to a range threshold, the executing module 304 executes a shutdown instruction of the pump.
By adopting the device for detecting the abnormality of the automobile cooling loop, whether the cooling liquid leaks or not can be judged, and the pump machine is automatically shut down when the cooling liquid leaks.
In one embodiment, the obtaining module 301 obtains a quadrature current value of the pump, including:
acquiring phase current values of three phases of the pump;
converting the phase current according to a first mathematical expression to obtain a current component in a two-phase stationary coordinate system, wherein the first mathematical expression is as follows:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively I α 、I β Two-phase current components under a two-phase static coordinate system respectively;
converting the current components in the two-phase static coordinate system according to a second mathematical expression to obtain a quadrature current value in the two-phase rotating coordinate system, wherein the second mathematical expression is as follows:
wherein I is q And theta is the phase angle for the quadrature current value.
In some embodiments, the device for detecting abnormality of an automotive cooling circuit is further configured to perform self-checking of the automotive cooling circuit, including when the determining module 303 determines that the value of the quadrature current deviation is less than the range threshold, and the value of the quadrature current deviation is less than the deviation threshold, the performing module 304 gradient-increases the rotational speed of the pump, so that the computing module 302 obtains the value of the quadrature current deviation corresponding to each gradient rotational speed;
when the quadrature axis current deviation value is determined to be greater than or equal to the deviation threshold, the execution module 304 determines the corresponding gradient rotational speed as a rotational speed extremum, so as to control the rotational speed of the pump to be less than the rotational speed extremum during operation.
The specific limitation of the device for detecting the abnormality of the cooling circuit of the automobile can be referred to as limitation of the method for detecting the abnormality of the cooling circuit of the automobile, and is not repeated herein. The above-described respective modules in the vehicle cooling circuit abnormality detection device may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method for detecting anomalies in a cooling circuit of a vehicle. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of when executing the computer program:
acquiring a quadrature axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the quadrature axis current value is subjected to low-pass filtering according to a first cut-off frequency, and a low-pass processing value is obtained;
acquiring a quadrature current average value of the pump according to the low-pass processing value in the target duration;
carrying out high-pass filtering on the quadrature current value according to a second cut-off frequency to obtain a high-pass processing value;
acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
and judging whether the quadrature current difference value is greater than or equal to a range threshold, if so, executing a bubble removal instruction, for example, controlling the pump to operate according to a preset exhaust rotating speed so as to enable the cooling liquid to flow through an exhaust device on the automobile cooling liquid loop.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring the rotating speed of the pump;
determining a quadrature current reference value of the pump from a reference corresponding relation according to the rotating speed;
determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value;
and executing a shutdown instruction of the pump when the quadrature current deviation value is greater than or equal to a deviation threshold value and the quadrature current deviation value is greater than or equal to a range threshold value.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring phase current values of three phases of the pump;
converting the phase current according to a first mathematical expression to obtain a current component in a two-phase stationary coordinate system, wherein the first mathematical expression is as follows:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively I α 、I β Two-phase current components under a two-phase static coordinate system respectively;
converting the current components in the two-phase static coordinate system according to a second mathematical expression to obtain a quadrature current value in the two-phase rotating coordinate system, wherein the second mathematical expression is as follows:
wherein I is q And theta is the phase angle for the quadrature current value.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a quadrature axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the quadrature axis current value is subjected to low-pass filtering according to a first cut-off frequency, and a low-pass processing value is obtained;
acquiring a quadrature current average value of the pump according to the low-pass processing value in the target duration;
carrying out high-pass filtering on the quadrature current value according to a second cut-off frequency to obtain a high-pass processing value;
acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
judging whether the quadrature current difference value is larger than or equal to a range threshold value, and if so, executing a bubble removal instruction.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring the rotating speed of the pump;
determining a quadrature current reference value of the pump from a reference corresponding relation according to the rotating speed;
determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value;
and executing a shutdown instruction of the pump when the quadrature current deviation value is greater than or equal to a deviation threshold value and the quadrature current deviation value is greater than or equal to a range threshold value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring phase current values of three phases of the pump;
converting the phase current according to a first mathematical expression to obtain a current component in a two-phase stationary coordinate system, wherein the first mathematical expression is as follows:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively I α 、I β Two-phase current components under a two-phase static coordinate system respectively;
converting the current components in the two-phase static coordinate system according to a second mathematical expression to obtain a quadrature current value in the two-phase rotating coordinate system, wherein the second mathematical expression is as follows:
wherein I is q And theta is the phase angle for the quadrature current value.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. An abnormality detection method for an automotive cooling circuit, comprising:
acquiring a quadrature axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the quadrature axis current value is subjected to low-pass filtering according to a first cut-off frequency, and a low-pass processing value is obtained;
acquiring a quadrature current average value of the pump according to the low-pass processing value in the target duration;
carrying out high-pass filtering on the quadrature current value according to a second cut-off frequency to obtain a high-pass processing value;
acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
judging whether the quadrature current difference value is larger than or equal to a range threshold value, if so, determining that bubbles exist in the automobile cooling liquid loop to execute a bubble removal instruction.
2. The method for detecting an abnormality of an automotive cooling circuit according to claim 1, further comprising, after the obtaining of the quadrature current margin value:
acquiring the rotating speed of the pump;
determining a reference value of the cross-axis current of the pump according to the rotation speed from a reference corresponding relation, wherein the reference corresponding relation is the corresponding relation between the rotation speed of the pump and the cross-axis current of the pump;
determining a quadrature current deviation value according to the quadrature current average value and the quadrature current reference value;
and when the quadrature current deviation value is greater than or equal to a deviation threshold value, and the quadrature current deviation value is greater than or equal to a range threshold value, determining that the automobile cooling liquid loop leaks so as to execute a shutdown instruction of the pump.
3. The method for detecting abnormality of an automotive cooling circuit according to claim 1, characterized in that the obtaining of the quadrature current value of the pump includes:
acquiring phase current values of three phases of the pump;
converting the phase current according to a first mathematical expression to obtain a current component in a two-phase stationary coordinate system, wherein the first mathematical expression is as follows:
wherein I is a 、I b 、I c The phase current values of the three phases of the pump are respectively I α 、I β Two-phase current components under a two-phase static coordinate system respectively;
converting the current components in the two-phase static coordinate system according to a second mathematical expression to obtain a quadrature current value in the two-phase rotating coordinate system, wherein the second mathematical expression is as follows:
wherein I is q For the value of the quadrature axis current, I d And the direct axis current value of the pump is theta, and the theta is a phase angle.
4. The method for detecting an abnormality of an automotive cooling circuit according to claim 1, characterized in that said executing a bubble removal instruction includes:
and controlling the pump to operate according to the exhaust rotation speed so that the cooling liquid flows through an exhaust device on the automobile cooling liquid circuit, wherein the exhaust rotation speed is determined according to the quadrature current pole difference value.
5. The method for detecting abnormality of an automotive cooling circuit according to claim 2, characterized by further comprising, after said determining the value of the quadrature current bias:
when the quadrature current deviation value is smaller than the range threshold, and the quadrature current deviation value is smaller than the deviation threshold, the rotating speed of the pump is increased in a gradient manner, and a quadrature current deviation value corresponding to each gradient rotating speed is obtained;
and determining the gradient rotating speed of which the quadrature axis current deviation value is greater than or equal to a deviation threshold value as a rotating speed extremum so as to control the rotating speed of the pump to be less than the rotating speed extremum when the pump operates.
6. The method of claim 5, wherein the gradient increasing the rotational speed of the pump comprises:
and determining gradient increment according to the accumulated driving distance of the automobile and/or the historical rotating speed of the pump, wherein the gradient increment and the accumulated driving distance form a negative correlation, and the gradient increment and the historical rotating speed of the pump form a negative correlation.
7. The method of detecting an abnormality of an automotive cooling circuit according to claim 6, characterized in that the gradient increases the rotational speed of the pump, comprising:
the gradient increment was determined according to the following third mathematical expression:
wherein h is gradient increment, D is accumulated driving distance of the vehicle in 0-T time, n is rotation speed of the pump, n 0 For the reference value of the rotation speed of the pump, H 0 As the basic step length, theta 1 、θ 2 To adjust the coefficients.
8. An abnormality detection device for an automotive cooling circuit, the device comprising:
the acquisition module is used for acquiring the quadrature axis current value of the pump, and the pump is a three-phase driving pump arranged on an automobile cooling liquid loop;
the calculating module is used for carrying out low-pass filtering on the quadrature axis current value according to the first cut-off frequency to obtain a low-pass processing value; the method is also used for obtaining the quadrature current average value of the pump according to the low-pass processing value in the target duration; the high-pass filter is further used for carrying out high-pass filtering on the quadrature axis current value according to a second cut-off frequency to obtain a high-pass processing value; acquiring a quadrature current difference value according to the quadrature current average value and the high-pass processing value;
the judging module is used for judging whether the quadrature current difference value is larger than or equal to a range threshold value;
and the execution module is used for determining that bubbles exist in the automobile cooling liquid loop when the quadrature current difference value is greater than or equal to a range threshold value so as to execute a bubble elimination instruction.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 7 when the computer program is executed by the processor.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310785058.0A CN116907871A (en) | 2023-06-29 | 2023-06-29 | Method, device, equipment and storage medium for detecting abnormality of automobile cooling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310785058.0A CN116907871A (en) | 2023-06-29 | 2023-06-29 | Method, device, equipment and storage medium for detecting abnormality of automobile cooling circuit |
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| CN116907871A true CN116907871A (en) | 2023-10-20 |
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| CN202310785058.0A Pending CN116907871A (en) | 2023-06-29 | 2023-06-29 | Method, device, equipment and storage medium for detecting abnormality of automobile cooling circuit |
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| CN (1) | CN116907871A (en) |
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- 2023-06-29 CN CN202310785058.0A patent/CN116907871A/en active Pending
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