An automobile cooling circuit abnormality detection method, device, equipment and storage medium

Abstract

The application relates to an automobile cooling loop anomaly detection method, device, equipment and storage medium, the method comprises the following steps: acquiring a cross-axis current value of a pump machine, the pump machine is a three-phase driving pump arranged on an automobile cooling liquid loop; the cross-axis current value is low-pass filtered according to a first cutoff frequency, and a low-pass processing value is obtained; the cross-axis current average value of the pump machine is obtained according to the low-pass processing value in a target time length; the cross-axis current value is high-pass filtered according to a second cutoff frequency, and a high-pass processing value is obtained; the cross-axis current average value and the high-pass processing value are used to obtain a cross-axis current range value; whether the cross-axis current range value is greater than or equal to a range threshold value is judged, if yes, a bubble elimination instruction is executed, and the method can improve the problem that bubble elimination is not timely in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a method, device and equipment for detecting abnormality of automobile cooling circuit and a storage medium. BACKGROUND

[0002] The cooling system is an important component of the automobile power assembly. In traditional automobiles, it is responsible for temperature regulation of the fuel engine to ensure that it works within a suitable temperature range. In new energy automobiles, the battery, motor, motor controller and charger need to be cooled, making the cooling system of the electric automobile more complex.

[0003] When the coolant circulates in the circuit, air may be mixed in to generate bubbles. The presence of bubbles in the automobile coolant may cause many hazards: the heat dissipation capacity decreases, which may cause the temperature of the engine and electrical components to rise and even overheat; the bubbles may cause air pressure fluctuations in the coolant, forming bubble impact, thereby generating vortex and impact force, causing wear of the metal surface, etc.

[0004] Therefore, the bubbles in the automobile coolant need to be handled in a timely manner, but it is difficult to detect the bubbles in the circuit, and the timeliness of bubble handling cannot be guaranteed. SUMMARY

[0005] Therefore, the present application provides a method, device and equipment for detecting abnormality of automobile cooling circuit and a storage medium to solve the problem of untimely bubble elimination in the prior art.

[0006] In one aspect, a method for detecting abnormality of automobile cooling circuit is provided, which comprises:

[0007] Obtaining an inter-axis current value of a pump, wherein the pump is a three-phase drive pump arranged on an automobile coolant circuit;

[0008] Low-pass filtering the inter-axis current value according to a first cutoff frequency to obtain a low-pass processed value;

[0009] Obtaining an inter-axis current average value of the pump according to the low-pass processed value within a target time length;

[0010] High-pass filtering the inter-axis current value according to a second cutoff frequency to obtain a high-pass processed value;

[0011] Obtaining an inter-axis current range value according to the inter-axis current average value and the high-pass processed value;

[0012] Determining whether the inter-axis current range value is greater than or equal to a range threshold value, and if so, determining that the automobile coolant circuit has bubbles to execute a bubble elimination instruction.

[0013] In one embodiment, after the obtaining the extreme difference value of the quadrature axis current, further comprising:

[0014] Obtaining the rotating speed of the pump;

[0015] Determining the reference value of the quadrature axis current of the pump from the reference corresponding relationship according to the rotating speed;

[0016] Determining the deviation value of the quadrature axis current according to the average value of the quadrature axis current and the reference value of the quadrature axis current;

[0017] When the deviation value of the quadrature axis current is greater than or equal to the deviation threshold value, and the extreme difference value of the quadrature axis current is greater than or equal to the extreme difference threshold value, it is determined that the automobile cooling liquid circuit leaks, and a pump shutdown instruction is executed.

[0018] In one embodiment, the obtaining the quadrature axis current value of the pump comprises:

[0019] Obtaining the phase current value of the three-phase of the pump;

[0020] Converting the phase current according to a first mathematical expression to obtain the current component in the two-phase static coordinate system, and the first mathematical expression is:

[0021]

[0022] Wherein, I a , I b , I c are the phase current values of the three-phase of the pump, and I α , I β are the two-phase current components in the two-phase static coordinate system;

[0023] Converting the current component in the two-phase static coordinate system according to a second mathematical expression to obtain the quadrature axis current value in the two-phase rotating coordinate system, and the second mathematical expression is:

[0024]

[0025] Wherein, I q is the quadrature axis current value, and θ is the phase angle.

[0026] In one embodiment, the executing the bubble elimination instruction comprises:

[0027] Controlling the pump to run according to a preset exhaust rotating speed, so that the cooling liquid flows through the exhaust device on the automobile cooling liquid circuit.

[0028] In one embodiment, after the determining the deviation value of the quadrature axis current, further comprising:

[0029] when the inter-axis current difference value is less than the difference threshold value and the inter-axis current deviation value is less than the deviation threshold value, the gradient increases the rotation speed of the pump to obtain an inter-axis current deviation value corresponding to each gradient rotation speed;

[0030] when it is determined that the inter-axis current deviation value is greater than or equal to the deviation threshold value, it is determined that the corresponding gradient rotation speed is a rotation speed extreme value, so as to control the rotation speed of the pump to be less than the rotation speed extreme value when the pump is running.

[0031] In one embodiment, the gradient increasing the rotation speed of the pump comprises:

[0032] According to the cumulative driving distance of the automobile and / or the historical rotation speed of the pump, a gradient increase amount is determined, wherein the gradient increase amount is in a negative correlation with the cumulative driving distance, and the gradient increase amount is in a negative correlation with the historical rotation speed of the pump.

[0033] In another aspect, an automobile cooling loop abnormality detection device is provided, and the device comprises:

[0034] An acquisition module is configured to acquire an inter-axis current value of a pump, wherein the pump is a three-phase driving pump arranged on an automobile cooling liquid loop.

[0035] A calculation module is configured to perform low-pass filtering on the inter-axis current value according to a first cutoff frequency to obtain a low-pass processing value, to obtain an inter-axis current average value of the pump according to the low-pass processing value within a target time length, and to perform high-pass filtering on the inter-axis current value according to a second cutoff frequency to obtain a high-pass processing value, and to obtain an inter-axis current difference value according to the inter-axis current average value and the high-pass processing value.

[0036] A judgment module is configured to judge whether the inter-axis current difference value is greater than or equal to a difference threshold value.

[0037] An execution module is configured to execute a bubble elimination instruction when the inter-axis current difference value is greater than or equal to the difference threshold value.

[0038] In another aspect, a computer device is provided, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the steps of the method.

[0039] A computer readable storage medium is also provided, which stores a computer program, and the computer program is executable on a processor to implement the steps of the method.

[0040] The automobile cooling circuit abnormality detection method, device, computer device and storage medium described above, by monitoring the cross-axis current value of the pump machine, performing low-pass filtering on the cross-axis current value, calculating the cross-axis current average value which can reflect the steady-state performance of the pump machine, performing high-pass filtering on the cross-axis current value, calculating the high-pass processing value, obtaining the cross-axis current range value according to the difference between the cross-axis current average value and the high-pass processing value, when the cross-axis current range value reaches or exceeds the range threshold value, it can be considered that there is bubble impact on the pump machine, and therefore the bubble elimination strategy is started. The automobile cooling circuit abnormality detection method provided in the present application can quickly identify whether there is bubble in the cooling liquid circuit, so as to quickly start the bubble elimination strategy. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 A flowchart of an automobile cooling circuit abnormality detection method in an embodiment;

[0042] Figure 2 A flowchart of judging cooling liquid leakage in an embodiment;

[0043] Figure 3 A flowchart of an automobile cooling circuit abnormality detection method in another embodiment;

[0044] Figure 4 A schematic diagram of the corresponding relationship between the cross-axis current and the pump machine speed in an embodiment;

[0045] Figure 5 A structural block diagram of an automobile cooling circuit abnormality detection device in an embodiment;

[0046] Figure 6 An internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0048] The automobile cooling system for temperature control by cooling liquid is a very important part of the vehicle. In new energy vehicles, cooling liquid is used as a heat transfer medium to cool power batteries, drive motors, chargers and other components, so as to ensure that these components work within a safe temperature range. When bubbles are mixed into the cooling liquid, the heat dissipation function of the components is affected. In order to reduce this risk and ensure normal operation of the vehicle, it is necessary to detect and eliminate whether there are bubbles in the cooling liquid.

[0049] The automobile cooling circuit abnormality detection method provided in the present application, as shown in Figure 1 includes the following steps

[0050] Step 101, obtain the quadrature axis current value of the pump machine.

[0051] It can be understood that the pump machine is a three-phase driving pump arranged on the cooling liquid circuit of the automobile, and the controller of the pump machine controls the pump machine to work at a stable rotating speed to drive the cooling liquid to flow through the target component along the cooling liquid circuit.

[0052] In the cooling system of the new energy automobile, the pump machine can be driven by a, b and c three-phase phase currents, and the a, b and c three-phase phase currents are monitored in real time. The three-phase phase currents can be converted to a two-phase stationary coordinate system according to the following first mathematical expression:

[0053]

[0054] wherein I a , I b , and I c are the three-phase phase current values of the pump machine.

[0055] Then, the two-phase current components I α and I β in the two-phase stationary coordinate system are converted to a two-phase rotating coordinate system according to a second mathematical expression, that is, the quadrature axis current value I q and the direct axis current value I d in the two-phase rotating coordinate system are obtained, and the second mathematical expression is:

[0056]

[0057] wherein θ is the phase angle of the motor rotor in the pump machine.

[0058] The direct axis current is the excitation current, and the quadrature axis current is the torque current. When the bubbles pass through the pump machine, the bubbles impact the quadrature axis current.

[0059] Step 102, low-pass filter the quadrature axis current value.

[0060] Exemplarily, the low-pass filter is used to filter the quadrature axis current value in a speed regulation period, and the cut-off frequency of the low-pass filter is a first cut-off frequency.

[0061] The quadrature axis current value after low-pass filtering has excluded the influence of high-frequency noise, and the low-pass filtered quadrature axis current value in a certain time in the history is continuously recorded.

[0062] Step 103, obtain the quadrature axis current average value of the pump machine according to the low-pass processed value in the target time length.

[0063] It can be understood that the target time length can be determined according to design requirements. In the embodiment, the target time length is one speed regulation period, and the pump runs at a fixed speed in the period. Therefore, the low-pass processing value in the target time length is a stable value in an ideal state, which can reflect the steady-state performance of the pump. The average value of the quadrature axis current can be obtained by integrating the low-pass processing value and dividing the target time length.

[0064] In step 104, the quadrature axis current value is high-pass filtered.

[0065] It is exemplarily illustrated that the high-pass filter is used to filter the quadrature axis current value in one speed regulation period, and the cutoff frequency of the high-pass filter is the second cutoff frequency.

[0066] The quadrature axis current value filtered by the high-pass filter has suppressed the low-frequency influence, and the influence of the quadrature axis current caused by the bubble impact is revealed.

[0067] In some embodiments, the first cutoff frequency is less than or equal to 2 Hz, and a preferred value is, for example, 1 Hz. Under the low-pass filtering processing of the cutoff frequency of 1 Hz, the noise of the quadrature axis current can be accurately removed, and the interference of the bubble impact on the average value calculation is reduced.

[0068] In another embodiment, the second cutoff frequency is greater than or equal to 35 Hz, and a preferred value is, for example, 40 Hz. Under the high-pass filtering processing of the cutoff frequency of 40 Hz, the fluctuation of the quadrature axis current caused by the bubble impact can be accurately retained.

[0069] In step 105, the quadrature axis current range value is obtained according to the average value of the quadrature axis current and the high-pass processing value.

[0070] It can be understood that the quadrature axis current range value can be the difference between the maximum value of the high-pass processing value and the average value of the quadrature axis current in the target time length (one speed regulation period), or the difference between the minimum value of the high-pass processing value and the average value of the quadrature axis current.

[0071] When the bubble impact passes through the pipeline part where the pump is located, the pressure fluctuation causes the appearance of the quadrature axis current range value.

[0072] In step 106, it is judged whether the quadrature axis current range value is greater than or equal to a range threshold value. If yes, a bubble elimination instruction is executed.

[0073] It is exemplarily illustrated that the range threshold value can be obtained according to calibration, and a typical value is, for example, 0.5 A.

[0074] The bubble elimination instruction can include starting an air exhaust device located on the cooling liquid circuit, sending prompt information to a driver, etc.

[0075] By monitoring and calculating the cross-axis current value of the pump machine, it can be monitored whether there is a bubble in the cooling liquid circuit, which can be realized at low cost, the method is simple, the existence of the bubble can be found in time, and the bubble elimination strategy is started, thereby improving the timeliness of bubble elimination.

[0076] As an embodiment of the above embodiment, when it is monitored that there is a bubble, the speed of the pump machine is forced to be increased to a preset exhaust speed, for example, 6000 rpm, in the next speed regulation period, and is maintained for a certain time length. Under high speed, the cooling liquid flows through the exhaust device, for example, the cooling liquid tank, on the automobile cooling liquid circuit.

[0077] The above-mentioned method directly forces the pump machine to operate at the maximum speed, which will cause high energy consumption problem for the electric vehicle.

[0078] In another embodiment, the exhaust speed is determined according to the cross-axis current difference value. Generally, the larger the cross-axis current difference value, the larger the exhaust speed; the smaller the cross-axis current difference value, the smaller the exhaust speed. The corresponding relationship between the cross-axis current difference value and the exhaust speed can be determined based on real vehicle calibration and stored for direct calling.

[0079] The exhaust speed is generally greater than the current speed. By increasing the speed, the bubble can be eliminated. As an optional embodiment, the speed increase Δn can be determined according to the cross-axis current difference value. The larger the cross-axis current difference value, the larger the speed increase Δn; the smaller the cross-axis current difference value, the smaller the speed increase Δn. The corresponding relationship between the two can also be determined based on real vehicle calibration. After the speed increase Δn is determined based on the cross-axis current difference value, the speed increase Δn is added to the current speed as the exhaust speed.

[0080] As a more serious fault, whether the cooling liquid leaks needs the vehicle system to pay more cost to monitor and identify.

[0081] As an embodiment of the above embodiment, the present application realizes the liquid leakage detection based on the bubble detection.

[0082] Exemplarily, as shown in Figure 2 After the cross-axis current difference value is obtained, the following steps are further included:

[0083] Step 201, acquiring the speed of the pump machine.

[0084] In the present embodiment, the pump machine speed of the current speed regulation period is calculated using a sliding mode observer.

[0085] Step 202, determining the cross-axis current reference value of the pump machine from the reference corresponding relationship according to the speed.

[0086] It can be understood that the benchmark correspondence can be obtained by testing in the calibration case, which is exemplarily illustrated as follows:

[0087] First, build a real vehicle cooling circuit bench, fill in 12L coolant and exhaust, ensure that there is no bubble in the pipeline.

[0088] Set the working speed of the pump machine to 1000 rpm, and collect the phase current values of the a, b, and c three phases of the current pump machine.

[0089] According to the first mathematical expression and the second mathematical expression, the phase current values of the a, b, and c three phases are subjected to coordinate transformation, and then the cross-axis current benchmark value under the speed of 1000 rpm is obtained.

[0090] Repeat the above process under different working speeds, that is, the speed-cross-axis current benchmark correspondence can be obtained, and the benchmark correspondence is stored, and in the real vehicle, the corresponding cross-axis current benchmark value can be obtained according to the speed.

[0091] Step 203, determining the cross-axis current deviation value according to the cross-axis current average value and the cross-axis current benchmark value.

[0092] It can be understood that in the case of no leakage, the cross-axis current average value is consistent with the cross-axis current benchmark value or the deviation is very small.

[0093] In actual implementation, the leakage causes the pressure change in the coolant circuit, and at the same time, it may also be accompanied by bubbles, which will cause the change of the cross-axis current average value in a speed regulation period, and the deviation between the cross-axis current average value and the cross-axis current benchmark value increases.

[0094] Step 204, judging the size of the cross-axis current deviation value and the range value, generally considering that when the cross-axis current deviation value is greater than or equal to the deviation threshold value, it can be determined that there is leakage, in the embodiment, when the two conditions of too large deviation and the existence of bubbles in the circuit are met at the same time, it is regarded as the premise of the execution of the leakage treatment strategy, therefore, when the cross-axis current deviation value is greater than or equal to the deviation threshold value, and the cross-axis current range value is greater than or equal to the range threshold value, the stop command of the pump machine is executed.

[0095] Exemplarily, the deviation threshold value can be a pre-calibrated proportion value, for example, 10% of the cross-axis current benchmark value, when the difference between the cross-axis current average value and the cross-axis current benchmark value reaches or exceeds 10%, and the cross-axis current range value reaches or exceeds 0.5A, the coolant leakage is identified, and the pump machine is stopped.

[0096] As Figure 3The diagram shows a flowchart of an embodiment for monitoring the presence of air bubbles and leakage in the coolant circuit based on the cross-axis current. In this flowchart, the presence of air bubbles is first determined based on the magnitude of the cross-axis current range. If so, the pump speed is forcibly increased to forcibly remove the air bubbles. After maintaining this speed for a certain period of time, such as 30 seconds, the speed before the forced venting is restored, and the forced venting flag is set to valid, indicating that one air bubble has been removed.

[0097] If the cross-axis current range is found to be greater than or equal to the range threshold, the pump speed will be monitored. Based on the cross-axis current reference value and the average cross-axis current value corresponding to the speed, it will be determined whether the cross-axis current deviation value is greater than or equal to the deviation threshold. If so, the pump will be stopped.

[0098] The aforementioned method for detecting abnormalities in the automotive cooling circuit can be applied during pump operation to detect and handle sudden leaks and air bubble impacts. This application also provides a self-test strategy for the automotive coolant circuit after the pump starts, as follows:

[0099] When the pump is started, it is kept at a low speed (i.e., the predefined self-test speed, which is generally the pump's starting speed). The presence of air bubbles or leakage is checked using the aforementioned method. If the cross-axis current deviation is less than the deviation threshold and the cross-axis current range is less than the range threshold, it can be considered that there are no air bubbles or leakage at the self-test speed.

[0100] Then, the pump speed is gradually increased to obtain the mean cross-axis current at each speed gradient, and the deviation value of the cross-axis current at each speed gradient is calculated. When the deviation value of the cross-axis current is greater than or equal to the deviation threshold, the corresponding speed gradient is determined as the speed extreme value. In subsequent operation, the pump speed is kept below the speed extreme value.

[0101] Understandably, the above self-testing strategies can detect hidden leaks in the vehicle's coolant circuit, such as... Figure 4 In the schematic diagram of the reference correspondence shown, the horizontal axis represents the pump speed range, the vertical axis represents the cross-axis current range, line A represents the cross-axis current reference value corresponding to the speed, region S is the reasonable range of cross-axis current determined based on the cross-axis current reference value and the deviation threshold, and line B is the average cross-axis current corresponding to each speed gradient as the speed gradient increases.

[0102] When the rotation speed of the pump machine is below Nmax, the average of the quadrature axis current is within a reasonable range. When the average of the quadrature axis current exceeds the reasonable range, it can be considered that the automobile cooling liquid circuit is at risk of liquid leakage due to some potential factors, such as a decrease in the performance of a sealing element, a decrease in the pressure bearing capacity caused by aging of a pipeline interface, and the like. The above-mentioned potential factors have little effect on the pump machine when it is running at low speed, but they can cause safety risks when the pump machine is running at high speed and the flow rate is increased. When the above-mentioned potential risks are found, the rotation speed of the pump machine can be limited, and the user can be notified in a timely manner.

[0103] In the above-mentioned self-checking strategy, a long time is required to complete the self-checking because the rotation speed is increased in steps. The automobile cooling circuit abnormality detection method provided in the present application uses a dynamic quantity as the step increase quantity, thereby shortening the self-checking time.

[0104] For example, the step increase quantity is determined according to the cumulative driving distance of the automobile. The shorter the cumulative driving distance, the lower the possibility of potential risks in the automobile cooling liquid circuit, and therefore a larger step increase quantity is used to shorten the self-checking time.

[0105] For another example, the step increase quantity is determined according to the historical rotation speed of the pump machine. The higher the historical rotation speed, the higher the possibility of potential risks in the automobile cooling liquid circuit when it is working at high load, and therefore a lower step increase quantity is used to obtain a more accurate self-checking result, and vice versa.

[0106] Exemplarily, when the rotation speed of the pump machine is increased in steps, the step increase quantity h is determined according to the following mathematical expression:

[0107]

[0108] wherein D is the cumulative driving distance of the vehicle within time 0-T, n is the rotation speed of the pump machine within time 0-T, n0 is a rotation speed reference value of the pump machine, representing the general rotation speed of the pump machine of most vehicles, which can be obtained through long-term testing of vehicles of the same type under a calibration vehicle condition, H0 is a basic step length obtained through calibration, and a typical value thereof is, for example, 1000 revolutions / S, θ1 and θ2 are adjustment coefficients, which can have different values for different vehicle models, and can also be obtained through real vehicle calibration, and are positive values.

[0109] Based on the above-mentioned mathematical expression, when the driving distance of the vehicle is short and the pump machine is not running for a long time, the possibility of potential risks in the cooling liquid circuit is low, and therefore the step increase quantity is large, and the self-checking process can be completed quickly. With the increase in the driving distance or the long-term high rotation speed of the pump machine, the step increase quantity gradually decreases, the self-checking process is prolonged, and a more accurate self-checking result is obtained.

[0110] It can be understood that the 0-T time can be understood as a time period from the last time the automobile cooling liquid circuit is overhauled to the current time, and each time the overhaul can reset the gradient increase amount, in addition, it needs to be pointed out that the above mathematical expression needs to be enabled after the vehicle travels a certain distance, and before that, the vehicle pump machine can increase the gradient according to a larger gradient increase amount (for example, H0).

[0111] It should be understood that although Figures 1-3 The steps in the flowchart of the above embodiment are displayed in sequence according to the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, Figures 1-3 At least part of the steps in the above embodiment can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or sub-steps or stages of other steps.

[0112] In one embodiment, as shown in Figure 5 An automobile cooling circuit anomaly detection device is provided, comprising: an acquisition module 301, a calculation module 302, a judgment module 303 and an execution module 304, wherein:

[0113] The acquisition module 301 is configured to acquire the quadrature axis current value of the pump machine, and the pump machine is a three-phase driven pump arranged on the automobile cooling liquid circuit.

[0114] The calculation module 302 is configured to perform low-pass filtering on the quadrature axis current value according to a first cutoff frequency to obtain a low-pass processing value, and is further configured to obtain a quadrature axis current average value of the pump machine according to the low-pass processing value within a target time length, and is further configured to perform high-pass filtering on the quadrature axis current value according to a second cutoff frequency to obtain a high-pass processing value, and is configured to obtain a quadrature axis current range value according to the quadrature axis current average value and the high-pass processing value.

[0115] The judgment module 303 is configured to judge whether the quadrature axis current range value is greater than or equal to a range threshold value.

[0116] The execution module 304 is configured to execute a bubble elimination instruction when the quadrature axis current range value is greater than or equal to the range threshold value.

[0117] The automobile cooling circuit abnormality detection device can quickly identify whether there is air bubble in the cooling liquid circuit, so that the air bubble elimination strategy can be quickly started.

[0118] In one embodiment, the acquisition module 301 is further configured to acquire the rotating speed of the pump machine, for example, the rotating speed is calculated by using a sliding film observer, and the calculation module 302 is further configured to determine the cross-axis current reference value of the pump machine from the reference corresponding relationship according to the rotating speed; and then determine the cross-axis current deviation value according to the cross-axis current average value and the cross-axis current reference value; and the judgment module 303 is further configured to judge whether the cross-axis current deviation value is greater than or equal to the deviation threshold value, if yes, and the cross-axis current range value is greater than or equal to the range threshold value, the execution module 304 executes the shutdown instruction of the pump machine.

[0119] The automobile cooling circuit abnormality detection device can determine whether the cooling liquid leaks, and automatically shut down the pump machine when the leakage occurs.

[0120] In one embodiment, the acquisition module 301 acquires the cross-axis current value of the pump machine, including:

[0121] The three-phase phase current values of the pump machine are acquired;

[0122] The phase current is converted according to the first mathematical expression to obtain the current component in the two-phase stationary coordinate system, and the first mathematical expression is:

[0123]

[0124] wherein, I a , I b , I c are the three-phase phase current values of the pump machine, I α , I β are the two-phase current components in the two-phase stationary coordinate system;

[0125] The current component in the two-phase stationary coordinate system is converted according to the second mathematical expression to obtain the cross-axis current value in the two-phase rotating coordinate system, wherein the second mathematical expression is:

[0126]

[0127] wherein, I q is the quadrature axis current value, and θ is a phase angle.

[0128] In some embodiments, the automobile cooling circuit abnormality detection apparatus is further configured to perform self-checking of the automobile cooling circuit, including: when the judging module 303 judges that the quadrature axis current range value is less than the range threshold value, and the quadrature axis current deviation value is less than the deviation threshold value, the executing module 304 increases the rotating speed of the pump machine by a gradient, so that the calculating module 302 obtains a quadrature axis current deviation value corresponding to each gradient rotating speed.

[0129] When it is determined that the quadrature axis current deviation value is greater than or equal to the deviation threshold value, the executing module 304 determines that the corresponding gradient rotating speed is a rotating speed extreme value, so as to control the rotating speed of the pump machine to be less than the rotating speed extreme value when the pump machine is running.

[0130] The specific limitations of the automobile cooling circuit abnormality detection apparatus can be referred to the limitations of the automobile cooling circuit abnormality detection method described above, which will not be repeated here. Each module in the automobile cooling circuit abnormality detection apparatus described above can be realized by software, hardware and combinations thereof, in whole or in part. Each module described above can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0131] In one embodiment, a computer device is provided, which can be a terminal, and the internal structure diagram thereof can be as shown in Figure 6 The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. 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 operating system and the computer program in the non-volatile storage medium to run. The network interface of the computer device is configured to communicate with external terminals through network connection. The computer program is executed by the processor to implement an automobile cooling circuit abnormality detection method. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or can be a key, trackball or touchpad arranged on the shell of the computer device, or can be an external keyboard, touchpad or mouse, etc.

[0132] Those skilled in the art can understand that Figure 6The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0133] 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 following steps when executing the computer program:

[0134] Obtaining a quadrature axis current value of a pump machine, the pump machine being a three-phase driven pump arranged on an automobile coolant circuit;

[0135] Low-pass filtering the quadrature axis current value according to a first cutoff frequency to obtain a low-pass processed value;

[0136] Obtaining a quadrature axis current average value of the pump machine according to the low-pass processed value within a target time length;

[0137] High-pass filtering the quadrature axis current value according to a second cutoff frequency to obtain a high-pass processed value;

[0138] Obtaining a quadrature axis current range value according to the quadrature axis current average value and the high-pass processed value;

[0139] Determining whether the quadrature axis current range value is greater than or equal to a range threshold value, and if so, executing a bubble elimination instruction, for example, controlling the pump machine to operate according to a preset exhaust speed, so that the coolant flows through an exhaust device on the automobile coolant circuit.

[0140] In one embodiment, the processor further implements the following steps when executing the computer program:

[0141] Obtaining a speed of the pump machine;

[0142] Determining a quadrature axis current reference value of the pump machine from a reference corresponding relationship according to the speed;

[0143] Determining a quadrature axis current deviation value according to the quadrature axis current average value and the quadrature axis current reference value;

[0144] When the quadrature axis current deviation value is greater than or equal to a deviation threshold value, and the quadrature axis current range value is greater than or equal to a range threshold value, executing a pump machine shutdown instruction.

[0145] In one embodiment, the processor further implements the following steps when executing the computer program:

[0146] Obtaining a phase current value of a three-phase of the pump machine;

[0147] According to the first mathematical expression, the phase current is converted to obtain a two-phase static coordinate system current component, the first mathematical expression being:

[0148]

[0149] wherein I a , I b , I c are three-phase phase current values of the pump machine, I α , I β are two-phase static coordinate system current components;

[0150] According to the second mathematical expression, the two-phase static coordinate system current component is converted to obtain a two-phase rotating coordinate system quadrature axis current value, wherein the second mathematical expression is:

[0151]

[0152] wherein I q is the quadrature axis current value, and θ is a phase angle.

[0153] In one embodiment, a computer readable storage medium is provided, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the following steps:

[0154] An acquisition of a quadrature axis current value of a pump machine, the pump machine being a three-phase driven pump arranged on a vehicle coolant circuit;

[0155] According to the first cutoff frequency, the quadrature axis current value is low-pass filtered to obtain a low-pass processed value;

[0156] According to the low-pass processed value within a target time length, a quadrature axis current average value of the pump machine is obtained;

[0157] According to the second cutoff frequency, the quadrature axis current value is high-pass filtered to obtain a high-pass processed value;

[0158] According to the quadrature axis current average value and the high-pass processed value, a quadrature axis current range value is obtained;

[0159] It is judged whether the quadrature axis current range value is greater than or equal to a range threshold value, and if so, a bubble elimination instruction is executed.

[0160] In one embodiment, the computer program is executed by the processor to further implement the following steps:

[0161] An acquisition of a rotational speed of the pump machine;

[0162] According to the rotational speed, a quadrature axis current reference value of the pump machine is determined from a reference corresponding relationship;

[0163] determining a quadrature axis current deviation value according to the average value of the quadrature axis current and the reference value of the quadrature axis current;

[0164] when the quadrature axis current deviation value is greater than or equal to a deviation threshold value and the quadrature axis current range value is greater than or equal to a range threshold value, executing a pump shutdown instruction.

[0165] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0166] obtaining phase current values of three phases of the pump;

[0167] converting the phase current according to a first mathematical expression to obtain current components in a two-phase stationary coordinate system, the first mathematical expression being:

[0168]

[0169] wherein I a , I b , and I c are phase current values of three phases of the pump, and I α and I β are two-phase current components in a two-phase stationary coordinate system;

[0170] converting the current components in the two-phase stationary coordinate system according to a second mathematical expression to obtain quadrature axis current values in a two-phase rotating coordinate system, wherein the second mathematical expression is:

[0171]

[0172] wherein I q is the quadrature axis current value, and θ is a phase angle.

[0173] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, databases, or other media in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile 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. As an illustration but not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0174] The technical features of the above embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0175] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. An automobile cooling circuit abnormality detection method characterized by comprising: The method comprises the following steps: obtaining the quadrature axis current value of the pump, wherein the pump is a three-phase driving pump arranged on the cooling liquid circuit of the automobile; performing low-pass filtering on the quadrature axis current value according to the first cutoff frequency to obtain a low-pass processed value; obtaining the average value of the quadrature axis current of the pump according to the low-pass processed value within the target time length; performing high-pass filtering on the quadrature axis current value according to the second cutoff frequency to obtain a high-pass processed value; obtaining the quadrature axis current range value according to the average value of the quadrature axis current and the high-pass processed value, wherein the quadrature axis current range value is the difference between the maximum value of the high-pass processed value and the average value of the quadrature axis current within the target time length, or the difference between the minimum value of the high-pass processed value and the average value of the quadrature axis current; obtaining the rotating speed of the pump; determining the quadrature axis current reference value of the pump from the reference corresponding relationship according to the rotating speed, wherein the reference corresponding relationship is the corresponding relationship between the rotating speed of the pump and the quadrature axis current of the pump; determining the quadrature axis current deviation value according to the average value of the quadrature axis current and the quadrature axis current reference value; when the quadrature axis current deviation value is greater than or equal to the deviation threshold value and the quadrature axis current range value is greater than or equal to the range threshold value, determining that the cooling liquid circuit of the automobile leaks liquid to execute the pump shutdown instruction; determining whether the quadrature axis current range value is greater than or equal to the range threshold value, and if yes, determining that the cooling liquid circuit of the automobile has bubbles to execute the bubble elimination instruction.

2. The automobile cooling circuit abnormality detection method according to claim 1, characterized by The method for obtaining the quadrature axis current value of the pump comprises the following steps: obtaining the phase current value of the three phases of the pump; performing conversion on the phase current according to the first mathematical expression to obtain the current component in the two-phase static coordinate system, wherein the first mathematical expression is: ； wherein, , , are the three-phase phase current values of the pump machine, , are the two-phase current components in the two-phase stationary coordinate system. performing conversion on the current component in the two-phase static coordinate system according to the second mathematical expression to obtain the quadrature axis current value in the two-phase rotating coordinate system, wherein the second mathematical expression is: ； wherein is the quadrature axis current value of the pump machine, and is the direct axis current value of the pump machine, and θ is the phase angle.

3. The automobile cooling circuit abnormality detection method according to claim 1, characterized by The method for executing the bubble elimination instruction comprises the following steps: controlling the pump to operate according to the exhaust rotating speed to make the cooling liquid flow through the exhaust device on the cooling liquid circuit of the automobile, wherein the exhaust rotating speed is determined according to the quadrature axis current range value.

4. The automobile cooling circuit abnormality detection method according to claim 1, characterized by After determining the quadrature axis current deviation value, the method further comprises the following steps: when the quadrature axis current range value is less than the range threshold value and the quadrature axis current deviation value is less than the deviation threshold value, increasing the rotating speed of the pump by a gradient to obtain the quadrature axis current deviation value corresponding to each gradient rotating speed; determining that the gradient rotating speed, at which the quadrature axis current deviation value is greater than or equal to the deviation threshold value, is the rotating speed extreme value to control the rotating speed of the pump to be less than the rotating speed extreme value when the pump operates.

5. The automobile cooling circuit abnormality detection method according to claim 4, characterized by The method for increasing the rotating speed of the pump by a gradient comprises the following steps: determining the gradient increase amount according to the cumulative driving distance of the automobile and / or the historical rotating speed of the pump, wherein the gradient increase amount is in a negative correlation relationship with the cumulative driving distance, and the gradient increase amount is in a negative correlation relationship with the historical rotating speed of the pump.

6. The automobile cooling circuit abnormality detection method according to claim 5, characterized by The method for increasing the rotating speed of the pump by a gradient comprises the following steps: determining the gradient increase amount according to the third mathematical expression: ； wherein h is a gradient increase amount, D is a cumulative driving distance of the vehicle in 0-T time, n is a rotational speed of the pump, is a rotational speed reference value of the pump, is a basic step size, , is an adjustment coefficient.

7. An automobile cooling circuit abnormality detection device characterized by comprising: The device comprises: an obtaining module configured to obtain the quadrature axis current value of the pump, wherein the pump is a three-phase driving pump arranged on the cooling liquid circuit of the automobile; The computing module is configured to perform low-pass filtering on the quadrature-axis current value according to a first cutoff frequency to obtain a low-pass processed value; is further configured to obtain a mean value of the quadrature-axis current of the pump according to the low-pass processed value within a target time length; is further configured to perform high-pass filtering on the quadrature-axis current value according to a second cutoff frequency to obtain a high-pass processed value; and is further configured to obtain a quadrature-axis current range value according to the mean value of the quadrature-axis current and the high-pass processed value; the quadrature-axis current range value is a difference between a maximum value of the high-pass processed value within the target time length and the mean value of the quadrature-axis current, or a difference between a minimum value of the high-pass processed value and the mean value of the quadrature-axis current; The judging module is configured to judge whether the quadrature-axis current range value is greater than or equal to a range threshold value; The executing module is configured to determine that the automobile cooling liquid circuit has air bubbles when the quadrature-axis current range value is greater than or equal to the range threshold value, and execute an air bubble elimination instruction. The obtaining module is further configured to obtain a rotating speed of the pump; The computing module is further configured to determine a quadrature-axis current reference value of the pump from a reference corresponding relationship according to the rotating speed, the reference corresponding relationship being a corresponding relationship between the rotating speed of the pump and the quadrature-axis current of the pump; The judging module is further configured to judge whether the quadrature-axis current deviation value is greater than or equal to a deviation threshold value; The executing module is further configured to determine that the automobile cooling liquid circuit has liquid leakage when the quadrature-axis current deviation value is greater than or equal to the deviation threshold value and the quadrature-axis current range value is greater than or equal to the range threshold value, and execute a pump shutdown instruction. The processor executes the computer program to implement the steps of the method in any one of claims 1 to 6.

8. 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 computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 6.

9. A computer-readable storage medium having stored thereon a computer program, characterized in that, ​

Images