CN115014565A - Coil temperature detection circuit and detection method - Google Patents
Coil temperature detection circuit and detection method Download PDFInfo
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- CN115014565A CN115014565A CN202210617304.7A CN202210617304A CN115014565A CN 115014565 A CN115014565 A CN 115014565A CN 202210617304 A CN202210617304 A CN 202210617304A CN 115014565 A CN115014565 A CN 115014565A
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- 238000001514 detection method Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 description 11
- 238000009529 body temperature measurement Methods 0.000 description 9
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- 238000013461 design Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
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Abstract
The embodiment of the invention provides a coil temperature detection circuit and a detection method. Aiming at any coil, one end of the invention is connected with a detection loop, and the other end is grounded through a switch module respectively; the detection loop at least comprises a voltage divider, and the voltage divider is used for controlling the voltage value of a coil connected in series in the detection loop within a preset range; when the temperature of the target coil needs to be detected, the switch module connected with the target coil is controlled to be closed, so that the target coil is connected in the detection loop in series. According to the embodiment of the invention, the voltage value of the current target coil is obtained through detection, the temperature of the current target coil is further obtained based on the voltage value of the target coil, the temperature of each coil in the ABS can be measured, the detected temperature value can be ensured to be almost the real temperature value in the coil, and the accuracy of coil temperature detection is ensured.
Description
Technical Field
The invention relates to the technical field of temperature detection, in particular to a coil temperature detection circuit and a detection method aiming at the interior of an ABS (antilock brake system).
Background
With the continuous progress of ABS technology, higher requirements are put on the acquisition of relevant data of products in the product development stage. In order to further understand the influence of various working conditions of the ABS on the ABS, the coil inside the ABS is used as one of important executive devices, and the temperature of the coil naturally becomes an important observed value.
In order to ensure the authenticity of the coil temperature data, the hermeticity of the ABS cannot be destroyed. The best rule is therefore to acquire the temperature of the individual coils directly within the ABS.
The current coil temperature detection mode is as follows: a wireless temperature sensor is arranged in the ABS, and the temperature of the coil is measured by the wireless temperature sensor. However, the wireless temperature sensors are large in size and cannot be placed in multiple positions, and the wireless temperature sensors cannot be distributed to each coil due to structural limitations of the test positions, namely, the temperature of each coil in the ABS cannot be measured respectively.
The current coil temperature detection mode is two: a plurality of patch temperature sensors are additionally designed on a PCB (Printed Circuit Board), but the IO port resources of more MCUs are needed, the layout of electronic elements of an original product is changed, and the method can only measure the surface temperature of a coil in a PCB accessory space, the actual temperature of the coil cannot be measured, namely the accuracy of detected coil temperature data cannot be guaranteed.
Disclosure of Invention
In view of this, the present invention provides a coil temperature detection circuit and a detection method, which not only can detect the temperature of each coil inside the ABS, but also can effectively ensure the accuracy of the detected coil temperature data. The technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a coil temperature detection circuit, including:
at least one coil;
one end of any coil is connected with the detection loop, and the other end of the coil is grounded through a switch module; the detection loop at least comprises a voltage divider, and the voltage divider is used for controlling the voltage value of a coil connected in series in the detection loop within a preset range;
when the temperature of a target coil needs to be detected, a switch module connected with the target coil is controlled to be closed, so that the target coil is connected in the detection loop in series, wherein the target coil is any one of the at least one coil.
Optionally, the voltage dividing device is a resistor, and a resistance value of the resistor and a resistance value of the coil satisfy: when the resistor is connected with the coil in series, the voltage value of the coil is controlled within a preset range.
Optionally, the voltage divider is a voltage dividing loop, and the voltage dividing loop and the coil satisfy: when the voltage division loop is connected with the coil in series, the voltage value of the coil is controlled within a preset range.
Optionally, the preset range includes: greater than or equal to 0.3V and less than or equal to 1V.
Optionally, the voltage divider is a constant current circuit, and the constant current circuit is used for controlling the current flowing through the coil within a threshold range.
Optionally, the detection circuit further includes a first power supply module and a switch module;
the first power supply module is used for providing input voltage meeting a first preset condition;
and the switch module on the detection loop is used for controlling whether the detection loop is communicated with the coil or not.
Optionally, the coil temperature detection circuit further includes:
and the output end of the second power supply module is provided with a switch module which is used for controlling whether the external power supply is communicated with the coil or not, and the second power supply module is a normal coil working power supply module.
Optionally, the power supply of the voltage divider includes: and the third power supply module is used for providing input voltage meeting a second preset condition, or the second power supply module is used for supplying power for normal coil operation.
Optionally, the switch module comprises at least one of: MOS tube, triode, IGBT.
In a second aspect, an embodiment of the present invention provides a coil temperature detection method, which is applied to the coil temperature detection circuit described in the first aspect, and the coil temperature detection method includes:
controlling the corresponding switch module to be switched on or switched off according to the received switch control instruction;
detecting the voltage value of the current target coil;
and obtaining the current temperature of the target coil based on the current voltage value of the target coil.
The technical scheme of the invention has the beneficial effects that:
in the coil temperature detection circuit provided by the embodiment of the invention, one end of each coil in the ABS is connected with the detection circuit, and the other end of each coil is grounded through a switch module, wherein the detection circuit at least comprises a voltage divider which is used for controlling the voltage value of the coil connected in series in the detection circuit within a preset range, for example, the preset range is greater than or equal to 0.3V and less than or equal to 1V, so that the temperature lost due to coil heating in the coil temperature measurement process can be reduced to be very small and can be almost ignored, and the accuracy of coil temperature measurement can be ensured. In practical application of the invention, when the temperature of the target coil needs to be detected, the switch module connected with the target coil is directly controlled to be closed, the target coil is connected in series in the detection loop, the voltage value of the current target coil is obtained through detection, and the temperature of the current target coil can be obtained further based on the voltage value. The coil temperature detection circuit is reasonably designed on the basis of the original circuit, so that the temperature of each coil in the ABS can be measured, the detected temperature value can be almost the real temperature value in the coil, and the accuracy of coil temperature detection is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a coil temperature detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another coil temperature detection circuit disclosed in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another coil temperature detection circuit according to an embodiment of the disclosure;
fig. 4 is a flowchart of a coil temperature detection method according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Before specifically introducing the technical solution protected by the present application, the applicant has conducted a lot of research and analysis on the problem that in the prior art, the temperature sensor is used to detect the coil temperature, but the detection data is inaccurate, and the reason for finding the inaccurate detection data is mainly: during actual measurement, the coil needs to be powered on, and the coil generates heat in the power-on process, that is, part of heat is generated and lost, and the lost heat can cause the detected temperature value to be lower than the actual real temperature value of the coil. Therefore, in order to ensure that an accurate coil temperature is obtained, it is desirable to minimize the generation of heat from the coil.
First, assume that the coil temperature at the time of measurement is expressed as: t is General assembly ＝T+ΔT；
Where T is the temperature of the coil before measurement and Δ T is the temperature at which the coil heats up during measurement.
According to the formula of specific heat capacity
Can derive that
Wherein C is the specific heat capacity, Q is the heat generated, and m is the coil enameled wire mass.
Because m and C of the coil are fixed, the coil temperature detection circuit designed by the invention reduces the heat quantity Q as much as possible, reduces the delta T, and when the delta T is reduced to a certain degree, the delta T can be considered to be ignored, and the measured coil temperature T can be considered to be the actual temperature T of the coil General (1) I.e. T General assembly ＝(T+ΔT)≈T。
Further, in how to reduce the heat Q, it is known that: the heat quantity Q can be expressed as
Wherein U is the voltage at two ends of the coil, R is the resistance value of the coil, and t is the time of getting electricity.
For the resistance R, if the generated heat Q is small, and the delta T is also considered to be small, the R is considered to be unchanged before and after the measurement, so that the generated heat Q can be reduced by reducing the voltage U at two ends of the coil and the power obtaining time T.
In the prior art, in the original circuit inside the ABS, each coil is provided with a normal input voltage by an external power supply, for example, the external power supply provides an input voltage of 12V. The invention designs a set of coil temperature detection circuit on the basis of not changing the original circuit design, and the coil temperature detection circuit can be used for measuring the temperature of each coil in the ABS, ensuring that the detected temperature value is almost the real temperature value in the coil and ensuring the accuracy of coil temperature detection.
As shown in fig. 1, the coil temperature detection circuit provided by the present invention includes:
at least one coil 100;
for any coil 100, one end is connected to the detection circuit 200, and the other end is grounded through a switch module 300; wherein the detection loop 200 at least comprises a voltage divider for controlling the voltage value of the coil serially connected in the detection loop 200 within a preset range. The predetermined range is, for example, 0V to 2V. Preferably, the preset range may be between 0.3V and 1V, and the preset range is not limited in the present invention.
When the temperature of the target coil needs to be detected, the switch module 300 connected with the target coil is controlled to be closed, so that the target coil is connected in the detection loop 200 in series. At this time, by detecting the voltage value of the current target coil, the temperature of the current target coil can be obtained based on the voltage value. Wherein the target coil is any one of the at least one coil 100.
In the embodiment of the present invention, the voltage divider in the detection circuit 200 may be a voltage divider circuit or a resistor. When the voltage divider is a voltage dividing loop, the voltage dividing loop and the coil satisfy the following conditions: when the voltage division loop is connected with the coil in series, the voltage value of the coil is controlled within a preset range; when the voltage divider is a resistor, the resistance value of the resistor and the resistance value of the coil meet the following conditions: when the resistor is connected with the coil in series, the voltage value of the coil is controlled within a preset range. It can be seen that, the embodiment of the present invention does not limit the specific representation form of the voltage divider in the detection circuit 200, and any circuit form that can ensure that the voltage value of the coil is controlled within the preset range when the voltage divider is connected in series with the coil is within the protection scope of the present invention.
In order to more clearly describe the embodiment of the present invention, it is shown in fig. 2. The embodiment of the invention takes the voltage divider as an example, specifically a resistor R, and the resistance value of the resistor R and the resistance value of the coil satisfy the following relationship: when the resistor R is connected in series with the coil, the voltage value of the coil is controlled to be about 1V through the voltage division of the resistor R.
The coil temperature detection circuit provided by the invention comprises a resistor R, a first power supply module and a switch module. Specifically, the method comprises the following steps:
the first power supply module is used for providing an input voltage meeting a first preset condition, for example, the first preset condition is less than a certain threshold voltage, and the purpose of the first power supply module is to provide a smaller input voltage. Illustratively and preferably, the first power supply module of the present invention is configured to provide an input voltage of 5V.
The switch module Q12 on the detection loop is used for controlling whether the detection loop is communicated with the coil or not. As can be seen from fig. 2, when the switching module Q12 is closed, the detection circuit is connected to the coil, and the 5V input voltage provided by the power supply is input to the coil. When the switching module Q12 is open, the detection loop is disconnected from the coil.
The power supply module (referred to as a second power supply module for convenience of description) in the original circuit inside the ABS for providing normal coil operation is used for providing 12V input voltage, that is, 12V input voltage for each coil inside in the actual operation process. On the basis of the embodiment of the present invention, a switch module Q11 is disposed at the output end of the second power supply module, and the switch module Q11 is used for controlling whether the second power supply module is communicated with the coil. As can be seen from fig. 2, when the switching module Q11 is closed, the second power supply module is connected to the coil, and 12V input voltage is input to the coil. When the switching module Q11 is open, the second power supply module is disconnected from the coil.
The switch module used in the embodiment of the present invention may select a switch having a fast response characteristic, wherein, for example, the switch module may be selected as at least one of the following: MOS transistors, triodes, IGBTs (Insulated Gate Bipolar transistors), and the like.
Based on fig. 2, when temperature measurement needs to be performed on one coil (taking coil L1 as an example), the switch module Q11 is controlled to be opened, the switch module Q12 is controlled to be closed, and the switch module Q1 corresponding to the coil L1 is controlled to be closed, so that a coil temperature detection circuit at least comprising 5V power supply voltage, R1, the switch module Q12, the coil L1 and the switch module Q1 is formed.
The applicant further analyzed the feasibility and accuracy of the present solution below.
The resistance value of R1 can be selected according to the formula of voltage division
And (4) determining. Wherein R is the resistance value of the coil at 20 ℃, and U is the voltage at two ends of the coil. It has been mentioned above that lowering the voltage U across the coil reduces the amount of heat Q generated, so the present invention preferably controls U to be around 1V.
Further based on coil rise time
Generally, the operation and measurement time allowance of the MCU is increased to about 5ms, and the power-on time t of the control coil is 20 ms.
Thus, according to the formula
Among them, U ═ 1V, t ═ 0.02s, and C ═ 0.39 × 10 are known 3 J/(Kg. DEG C) (specific heat capacity of copper), coil resistance R of 4.06. omega. (at 20 ℃), mass m of less than 0.1Kg, and Delta T of 10 -5 A rank. The effect of Δ T is very small and negligible at this time. The following relationship is thus obtained:
wherein R is 0 Coil resistance at 20 ℃ T 0 At 20 ℃, the current coil temperature T (namely T) can be obtained only by measuring the current coil resistance R General assembly )。
Further, according to the formula of partial pressure
The current resistance value R of the coil can be obtained by measuring the voltage U at the two ends of the current coil, and the current coil temperature T can be further obtained.
Based on the same principle, when the temperature of the coil L2 needs to be measured, the switch module Q1 corresponding to the coil L1 is switched off, and the switch module Q2 corresponding to the coil L2 is controlled to be switched on, so that the current resistance value R of the coil L2 can be obtained by measuring the voltage U at the two ends of the current coil L2, and the temperature T of the current coil L2 can be further obtained; when the temperature of the coil Ln needs to be measured, the switching modules corresponding to other coils are controlled to be switched off, only the switching module Qn corresponding to the coil Ln is controlled to be switched on, the current resistance value R of the coil Ln can be obtained by measuring the voltage U at the two ends of the current coil Ln, and therefore the temperature T of the current coil Ln can be further obtained until the temperature measurement of all the coils L is completed.
In addition, on the basis of the above embodiment, the voltage dividing device in the detection circuit 200 in the embodiment of the present invention may also be a constant current circuit, as shown in fig. 3, which is specifically configured to control the current flowing through the coil within the threshold range. With a threshold range of 100mA, for example. At this time, the power supply module of the voltage divider may be a third power supply module configured for itself and configured to provide an input voltage satisfying a second preset condition, or a second power supply module directly selected and used for supplying power for normal coil operation. The second predetermined condition is, for example, less than a certain threshold voltage, which is aimed at ensuring a smaller input current in the detection loop, thereby ensuring that the voltage at two ends of the coil is controlled within a predetermined range. As mentioned above, by continuing the example, assuming that the constant current circuit ensures that the current in the detection loop is 100mA, and the coil resistance R is 4.06 Ω (at 20 ℃), the voltage across the coil is 0.406V at this time, which satisfies the requirement of "reducing the voltage U across the coil", and can reduce the generated heat Q.
Further, based on the coil temperature detection circuit provided in the foregoing embodiment of the invention, an embodiment of the invention further provides a coil temperature detection method, as shown in fig. 4, which is specifically applied to the coil temperature detection circuit described above. The method comprises the following steps:
In the actual working process, the ABS is communicated with the upper computer through the CAN communication tool. When coils in the ABS need to be measured, the upper computer sends the switch control instruction to the ABS through the CAN communication tool. The transceiver in the ABS is responsible for receiving the switch control command and forwarding the switch control command to an MCU (micro controller Unit), which controls the corresponding switch module to be turned on or turned off according to the switch control command.
Taking the example of detecting the temperature of the coil L1 for the first time (at this time, the coil L1 is the target coil), the MCU controls the switching module Q11 to be open, the switching module Q12 to be closed, and the switching module Q1 to be closed according to the switching control command.
And 402, detecting the voltage value of the current target coil.
In the embodiment of the invention, when the voltage divider is a voltage dividing loop or a resistor, the voltage values at two ends of the target coil can be detected by an external voltage detection device; when the voltage divider is a constant current circuit, the current voltage value of the target coil can be calculated directly based on the current controlled by the constant current circuit and the resistance value of the target coil.
And 403, obtaining the temperature of the current target coil based on the voltage value of the current target coil.
After the corresponding switch module is controlled to be closed or opened, the current voltage value of the coil L1 is detected. After the voltage value of the current coil L1 is detected, the temperature value of the current coil L1 can be calculated based on the voltage value.
In the embodiment of the invention, after detecting the voltage value of the coil L1, the MCU can send the voltage value of the coil L1 to the upper computer through the transceiver, or after calculating the current temperature value of the coil L1 according to the voltage value, send the current temperature value of the coil L1 to the upper computer through the transceiver, and the upper computer realizes data storage.
When the temperature measurement of the coil L1 is completed, it is assumed that the temperature measurement of the coil L2 is continued. At this time, the MCU maintains the switch module Q11 open and the switch module Q12 closed according to the switch control command, and continues to control the switch module Q1 open and the switch module Q2 closed, so as to measure the temperature of the coil L2. And repeating the steps to sequentially complete the temperature measurement and acquisition of the coils L2 to Ln, wherein n is a positive integer.
The coil temperature detection circuit and the detection method provided by the embodiment of the invention have the following advantages:
1. through circuit design and theoretical analysis, heat generation during measurement is reduced, and more accurate coil internal temperature can be obtained.
2. Regardless of the number of coils, each coil temperature can be obtained.
3. The detection speed is high, and the most real temperature of the required time point can be obtained.
To sum up, in the coil temperature detection circuit provided in the embodiment of the present invention, for each coil inside the ABS, one end of the coil is connected to the detection circuit, and the other end of the coil is grounded through a switch module, where the detection circuit includes at least one voltage divider for controlling the voltage value of the coil connected in series in the detection circuit within a preset range, where the preset range is, for example, less than or equal to 1V, so that the temperature loss due to the heating of the coil during the coil temperature measurement process can be reduced to a very small value, which can be almost ignored, and thus the accuracy of the coil temperature measurement can be ensured. In practical application of the invention, when the temperature of the target coil needs to be detected, the switch module connected with the target coil is directly controlled to be closed, the target coil is connected in series in the detection loop, the voltage value of the current target coil is obtained through detection, and the temperature of the current target coil can be obtained further based on the voltage value. The coil temperature detection circuit is reasonably designed on the basis of the original circuit, so that the temperature of each coil in the ABS can be measured, the detected temperature value can be almost the real temperature value in the coil, and the accuracy of coil temperature detection is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A coil temperature detection circuit, comprising:
at least one coil;
one end of any coil is connected with the detection loop, and the other end of the coil is grounded through a switch module; the detection loop at least comprises a voltage divider, and the voltage divider is used for controlling the voltage value of a coil connected in series in the detection loop within a preset range;
when the temperature of a target coil needs to be detected, a switch module connected with the target coil is controlled to be closed, so that the target coil is connected in the detection loop in series, wherein the target coil is any one of the at least one coil.
2. The coil temperature detecting circuit according to claim 1, wherein the voltage dividing means is a resistor, and a resistance value of the resistor and a resistance value of the coil satisfy: when the resistor is connected with the coil in series, the voltage value of the coil is controlled within a preset range.
3. The coil temperature detecting circuit according to claim 1, wherein the voltage divider is a voltage dividing loop, and the voltage dividing loop and the coil satisfy: when the voltage division loop is connected with the coil in series, the voltage value of the coil is controlled within a preset range.
4. The coil temperature detection circuit according to claim 2 or 3, wherein the preset range includes: greater than or equal to 0.3V and less than or equal to 1V.
5. The coil temperature detecting circuit according to claim 1, wherein the voltage dividing means is a constant current circuit for controlling a current flowing through the coil within a threshold range.
6. The coil temperature detecting circuit according to claim 2 or 3, wherein the detecting circuit further comprises a first power supply module and a switch module;
the first power supply module is used for providing input voltage meeting a first preset condition;
and the switch module on the detection loop is used for controlling whether the detection loop is communicated with the coil or not.
7. The coil temperature detection circuit according to claim 6, further comprising:
and the output end of the second power supply module is provided with a switch module which is used for controlling whether the second power supply module is communicated with the coil or not, and the second power supply module is a normal coil working power supply module.
8. The coil temperature detecting circuit according to claim 5, wherein the power supply source of the voltage dividing means includes: and the third power supply module is used for providing input voltage meeting a second preset condition, or the second power supply module is used for supplying power for normal coil operation.
9. The coil temperature detection circuit according to any one of claims 1-3, 5, and 7-8, wherein the switch module comprises at least one of: MOS tube, triode, IGBT.
10. A coil temperature detection method applied to the coil temperature detection circuit according to any one of claims 1 to 7, the coil temperature detection method comprising:
controlling the corresponding switch module to be switched on or switched off according to the received switch control instruction;
detecting the voltage value of the current target coil;
and obtaining the current temperature of the target coil based on the current voltage value of the target coil.
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