CN112556871A - Temperature acquisition system for automobile and acquisition method thereof - Google Patents
Temperature acquisition system for automobile and acquisition method thereof Download PDFInfo
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- 238000009529 body temperature measurement Methods 0.000 claims description 31
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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 invention discloses a temperature acquisition system for an automobile, which comprises an acquisition module, a selection unit, an integrated digital converter, a display module and a controller, and is characterized by also comprising a communication module and a signal conversion circuit, wherein the display module, the communication module and the integrated digital converter are electrically connected with the controller, the acquisition modules are respectively provided with a plurality of acquisition modules, each acquisition module is used for detecting the temperature of an automobile temperature sampling point, the selection unit is used for selecting the plurality of acquisition modules, and the integrated digital converter is electrically connected with the selection unit. The invention solves the problem that the multi-point acquisition temperature acquisition of the existing vehicle needs a plurality of input loops to cause inconvenient acquisition.
Description
Technical Field
The invention relates to the technical field of automobile temperature detection, in particular to a temperature acquisition system and a temperature acquisition method for an automobile.
Background
With the development of science and technology, temperature acquisition has become an important parameter in industrial object control, and the temperature parameter directly affects production efficiency, energy consumption and atmospheric pollution. For example, the system is widely applied in the field of automobiles, for example, an electronic fuel injection system needs to control the working condition of an engine, the parameters such as accurate air inlet temperature, coolant temperature and the like, the automatic temperature control of an air conditioner needs the parameters such as the air temperature outside the automobile, the air temperature inside the automobile and the like, the resistance value of the conventional temperature acquisition principle is changed mainly through the influence of the temperature on an external thermistor, and the conventional temperature acquisition principle is finally utilized by the whole system through a sampling circuit, A/D conversion and the like.
However, the current temperature acquisition adopts respective input loops independently, namely each path adopts links such as sampling, A/D and the like, so that if multipoint acquisition is carried out, the cost is multiplied compared with that of a single path, more input/output interfaces of a processor are occupied, and the temperature sampling system is huge in size; in addition, if the characteristics of the thermistors used for multipoint acquisition are inconsistent, the parameter characteristics of the analog device and the resistance-capacitance element can be inconsistent, and great troubles are brought to system calibration.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a temperature acquisition system for an automobile, and solves the problem that the multi-point acquisition of the temperature of the existing automobile requires a plurality of input loops, so that the acquisition is inconvenient.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a temperature acquisition system for car, includes collection module, selection unit, integrated digital converter, display module and controller, its characterized in that, this system still includes communication module, signal conversion circuit, display module, communication module, integrated digital converter and controller electric connection, collection module is equipped with a plurality ofly respectively, every collection module is used for detecting the temperature of car temperature sampling point, the selection unit is used for selecting a plurality of collection modules, integrated digital converter and selection unit electric connection.
Preferably, the acquisition module comprises a thermistor and a reference resistor.
Preferably, the selection unit comprises a thermistor selection unit and a reference resistor selection unit, and the thermistor selection unit and the reference resistor selection unit are respectively electrically connected with the controller.
Preferably, the thermistor selection unit is DG406, and the reference resistor selection unit is MAX 4734.
Preferably, the integrated digitizer is MAX 6682.
Preferably, the acquisition module comprises a one-out-of-four analog switch chip; and the common output end of the one-out-of-four analog switch chip is connected with the input end of the signal conversion circuit, and the control end of the one-out-of-four analog switch chip is connected with the controller.
Preferably, a noise suppression circuit is further connected to the temperature acquisition system.
Preferably, the resistance value of the reference resistor is obtained by the following formula:
Rext＝(Rmid*(Rmin+Rmax)-2Rmin*Rmax)/(Rmin+Rmax-2Rmid)，
the Rext is a resistance value of the reference resistor, the Rmin is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the upper limit temperature of the temperature measurement range, the Rmax is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the lower limit temperature of the temperature measurement range, and the Rmid is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the middle temperature of the lower limit temperature and the upper limit temperature of the temperature measurement range.
The temperature acquisition method for the automobile comprises the following steps:
the automobile temperature acquisition steps are as follows:
installing an acquisition module at an acquisition point needing temperature on an automobile, wherein the acquisition module is used for acquiring the temperature of the temperature sampling point of the automobile, a signal conversion circuit is formed among the acquisition module, a selection unit, an integrated digital converter, a display module and a controller, and a noise suppression circuit is connected at the acquisition point;
after the signal conversion circuit and the noise suppression circuit are connected, starting a controller switch, selecting a plurality of reference resistors and a plurality of thermistors by the selection unit under the action of the controller, and adjusting the temperature measurement range of the integrated digital converter according to the thermistors selected by the selection unit, wherein the resistance values of the plurality of reference resistors are different and respectively correspond to one temperature measurement range; the integrated digital converter is connected with the selection unit so as to convert the resistance value of the selected thermistor corresponding to the temperature into a digital signal according to the selected reference resistor; the selection unit selects a thermistor at a temperature sampling point to be detected of the automobile, controls the selection unit to select a corresponding reference resistor according to the temperature change range of the temperature sampling point, and displays the temperature of the temperature sampling point through the display module according to a digital signal from the integrated digital converter;
and thirdly, displaying the temperature of the temperature sampling point by a display module and comparing the temperature with a normal value of the temperature of the point, and if the temperature value acquired by the point is abnormal, starting shutdown protection by a controller or controlling a temperature regulating system to regulate the temperature of the point by the controller.
The design can simply complete a plurality of temperature ranges through the selection of the reference resistor 110 and the thermistor 120 by the selection unit 130 of the temperature acquisition system, the temperature acquisition of a plurality of temperature acquisition points is realized, the temperature acquisition of the plurality of temperature acquisition points does not need separate respective input loops, the integrated digital converter 140 is used, the temperature acquisition is directly output to the controller 150 in a digital form, the controller 150 is not required to be subjected to A/D processing, the cost is low, the temperature acquisition results of the plurality of temperature acquisition points can be directly sent to the controller 150 through the integrated digital converter 140, the occupied space of the temperature acquisition system for the automobile in the automobile is saved, the calibration of the temperature acquisition system is more convenient, and the reliability of the automobile is improved.
Drawings
FIG. 1 is a schematic view of the acquisition system of the present invention;
FIG. 2 is a circuit diagram of an acquisition system of the present invention;
in the figure: 110. the device comprises reference resistors 110, 120, thermistors 130, a selection unit 131, a thermistor selection unit 132, a reference resistor selection unit 140, an integrated digital converter 150, a controller 160, a signal conversion circuit 170, a noise suppression circuit 180, a communication module 190 and a display module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The temperature acquisition system for the automobile shown in fig. 1 comprises an acquisition module, a selection unit 130, an integrated digital converter 140, a display module 190 and a controller 150, and is characterized by further comprising a communication module 180 and a signal conversion circuit 160, wherein the display module 190, the communication module 180, the integrated digital converter 140 are electrically connected with the controller 150, the acquisition modules are respectively provided in plurality, each acquisition module is used for detecting the temperature of an automobile temperature sampling point, the selection unit 130 is used for selecting the acquisition modules, and the integrated digital converter 140 is electrically connected with the selection unit 130. The acquisition module includes a thermistor 120 and a reference resistor 110.
Preferably, the selection unit 130 includes a thermistor selection unit 131 and a reference resistor selection unit 132, and the thermistor selection unit 131 and the reference resistor selection unit 132 are respectively electrically connected to the controller 150. The thermistor selection unit 131 is DG406, and the reference resistor selection unit 132 is MAX 4734. The integrated digitizer 140 is MAX 6682. The acquisition module comprises a one-out-of-four analog switch chip; the common output terminal of the one-of-four analog switch chip is connected to the input terminal of the signal conversion circuit 160, and the control terminal is connected to the controller 150. The temperature acquisition system is also connected with a noise suppression circuit 170. The resistance value of the reference resistor 110 is obtained by the following formula:
Rext＝(Rmid*(Rmin+Rmax)-2Rmin*Rmax)/(Rmin+Rmax-2Rmid)，
where Rext is a resistance value of the reference resistor 110, Rmin is a resistance value of the thermistor 120 corresponding to the temperature measurement range corresponding to the reference resistor 110 at an upper limit temperature of the temperature measurement range, Rmax is a resistance value of the thermistor 120 corresponding to the temperature measurement range corresponding to the reference resistor 110 at a lower limit temperature of the temperature measurement range, and Rmid is a resistance value of the thermistor 120 corresponding to the temperature measurement range corresponding to the reference resistor 110 at a middle temperature between the lower limit temperature and the upper limit temperature of the temperature measurement range.
The temperature acquisition method for the automobile comprises the following steps:
the automobile temperature acquisition steps are as follows:
firstly, an acquisition module is arranged at an acquisition point needing temperature on an automobile and used for acquiring the temperature of the temperature sampling point of the automobile, a signal conversion circuit 160 is formed among the acquisition module, the selection unit 130, the integrated digital converter 140, the display module 190 and the controller 150, and a noise suppression circuit 170 is connected at the acquisition point;
after the signal conversion circuit 160 and the noise suppression circuit 170 are connected, starting a switch of the controller 150, under the action of the controller 150, the selection unit 130 selects the plurality of reference resistors 110 and the plurality of thermistors 120, and the integrated digital converter 140 is used for adjusting the temperature measurement range of the integrated digital converter according to the thermistors 120 selected by the selection unit 130, wherein the resistance values of the plurality of reference resistors 110 are different and respectively correspond to one temperature measurement range; the integrated digitizer 140 is connected to the selection unit 130 to convert the resistance value of the selected thermistor 120 corresponding to the temperature into a digital signal according to the selected reference resistor 110; the selection unit 130 selects the thermistor 120 at the temperature sampling point to be detected of the automobile and controls the selection unit 130 to select the corresponding reference resistor 110 according to the temperature variation range of the temperature sampling point, and the temperature of the temperature sampling point is displayed through the display module 190 according to the digital signal from the integrated digital converter 140;
and step three, displaying the temperature of the temperature sampling point and a normal value of the temperature of the point through the display module 190, and if the temperature value acquired by the point is abnormal, starting shutdown protection by the controller 150 or controlling a temperature adjusting system to adjust the temperature of the point by the controller 150.
As shown in fig. 2, one includes 4 reference resistors 110 (i.e., Ra, Rb, Rc, and Rd) and 16 thermistors 120 (i.e., R1 to R16), and the selection unit 130 is composed of a thermistor selection unit 131 and a reference resistor selection unit 132. The thermistor selection unit 131 is connected to the controller 150 to select the thermistor 120 under the control of the controller 150. The reference resistance selection unit 132 is connected to the controller 150 to select the reference resistance 110 under the control of the controller 150. The thermistor selection unit 131 is a DG406, the reference resistor selection unit 132 is a MAX4734, and the integrated digital converter 140 employs a MAX6682, where the MAX4734 is an ultra-low on-resistance analog switch with four choices, the DG406 is a low-resistance analog switch with sixteen choices, and the MAX6682 has the advantages of low price, high precision, and SPI-compatible interface, and the like, and can directly convert the resistance value of the thermistor 120 corresponding to the temperature into a digital output, and the operating range of the MAX6682 is from-55 ℃ to 125 ℃, which can meet the application requirements of the automobile.
In the above example, the resistance value of each reference resistor 110 is associated with one temperature measurement range of the integrated digitizer 140. For example: the resistance value of each reference resistor 110 is obtained by the following formula:
Rext＝(Rmid*(Rmin+Rmax)-2Rmin*Rmax)/(Rmin+Rmax-2Rmid)。
where Rext is a resistance value of the reference resistor 110, Rmin is a resistance value of the thermistor 120 corresponding to the temperature measurement range corresponding to the reference resistor 110 at an upper limit temperature of the temperature measurement range, Rmax is a resistance value of the thermistor 120 corresponding to the temperature measurement range corresponding to the reference resistor 110 at a lower limit temperature of the temperature measurement range, and Rmid is a resistance value of the thermistor 120 corresponding to the temperature measurement range at a temperature intermediate between the lower limit temperature and the upper limit temperature of the temperature measurement range.
Specifically, the temperature range to be measured is determined, for example, 0 to 70 ℃ is measured, then the minimum resistance Rmin and the maximum resistance Rmax of the thermistor 120 at 0 to 70 ℃ and the resistance Rmid corresponding to the intermediate temperature (i.e., 35 ℃) are found according to the characteristic parameters provided by the manufacturer of the thermistor 120, and then, after the Rmax, Rmin and Rmid are obtained, the resistance of the reference resistor 110 at the temperature range of 0 to 70 ℃ can be calculated according to the following formula, and the selected resistance of the reference resistor 110 is relatively reasonable. The thermistors 120R1 to R16 can be selected according to the actual temperature to be measured, for example, R1 to R3 are suitable for measuring the temperature of the position with the temperature between 0 ℃ and 70 ℃, R4 to R9 are suitable for measuring the temperature of the position with the temperature between-20 ℃ and 40 ℃, R10 to R13 are suitable for measuring the temperature of the position with the temperature between-30 ℃ and-850 ℃, and R14 to R16 are suitable for measuring the temperature of the position with the temperature between-50 ℃ and 130 ℃.
As shown in connection with fig. 2, the MAX4734 may control the four reference resistors 110 to switch into the MAX6682, respectively. As shown in table 1:
TABLE 1
| A1 | A0 | EN | On Switch |
| X | X | 0 | NONE |
| 0 | 0 | 1 | 1 |
| 0 | 1 | 1 | 2 |
| 1 | 0 | 1 | 3 |
| 1 | 1 | 1 | 4 |
Wherein X ═ DON' T CARE (arbitrary value). The selection of the four reference resistors 110 is determined by the thermistor 120 to be tested, for example, Ra for the reference resistor 110 in the range of-30 deg.C to 85 deg.C and Rb for the reference resistor 110 in the range of-50 deg.C to 130 deg.C. It should be noted that several reference resistors 110 are specifically required, and the resistance value of each reference resistor 110 may be determined according to actual requirements.
DG406 may control 16 thermistors 120 to be connected separately as shown in table 2:
TABLE 2
Wherein X ═ DON' T CARE (arbitrary value). After first selecting the appropriate reference resistor 110 for the MAX4734, the correct address is selected for the particular location. For example: the temperature at the left front door of the car was measured by first selecting the external reference resistance Ra (-30-85 ℃) for MAX4734, and as shown in table 1, the controller 150 controlled the data sent to the a1, a0, EN terminals of MAX4734 to be "001", then the DG406 selected a specific position, and assuming the switch position of the left front door thermistor 120 to be 12, the controller 150 controlled the data sent to the terminals of A3, a2, a1, a0, EN of the DG406 to be "10111". Finally, the controller 150 controls the enable CS of the MAX6682 to go high, SO that the SO port of the MAX6682 starts to transmit data to the controller 150, in digital form. If the temperature of the wire harness near the engine is measured, firstly, the reference resistor Rb (-50-130 ℃) is selected, the controller 150 controls the data of the terminals A1, A0 and EN sent to MAX4734 to be "011", then the DG406 selects a specific position, and if the switch position of the wire harness thermistor 120 near the engine is 10, the controller 150 controls the data of the terminals A3, A2, A1, A0 and EN sent to the DG406 to be "10011"; finally, the controller 150 controls the enable CS of the MAX6682 to go high, and the SO port of the MAX6682 starts to transmit data to the controller 150, in digital form.
The design can simply complete a plurality of temperature ranges through the selection of the reference resistor 110 and the thermistor 120 by the selection unit 130 of the temperature acquisition system, the temperature acquisition of a plurality of temperature acquisition points is realized, the temperature acquisition of the plurality of temperature acquisition points does not need separate respective input loops, the integrated digital converter 140 is used, the temperature acquisition is directly output to the controller 150 in a digital form, the controller 150 is not required to be subjected to A/D processing, the cost is low, the temperature acquisition results of the plurality of temperature acquisition points can be directly sent to the controller 150 through the integrated digital converter 140, the occupied space of the temperature acquisition system for the automobile in the automobile is saved, the calibration of the temperature acquisition system is more convenient, and the reliability of the automobile is improved.
Since the number of channels, on-resistance, leakage current, device packaging, crosstalk, noise, and other factors in the temperature acquisition system for the vehicle all affect the accuracy of the data, the accuracy of the acquired data can be ensured by further processing with software, such as the noise suppression circuit 170 or the switching speed of the selection unit 130 can be controlled to avoid the data influence during the on/off period of the switch during the temperature acquisition process.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (9)
1. The utility model provides a temperature acquisition system for car, includes collection module, selection unit, integrated digital converter, display module and controller, its characterized in that, this system still includes communication module, signal conversion circuit, display module, communication module, integrated digital converter and controller electric connection, collection module is equipped with a plurality ofly respectively, every collection module is used for detecting the temperature of car temperature sampling point, the selection unit is used for selecting a plurality of collection modules, integrated digital converter and selection unit electric connection.
2. The system of claim 1, wherein the collection module comprises a thermistor and a reference resistor.
3. The temperature collecting system for the automobile as claimed in claim 1, wherein the selecting unit comprises a thermistor selecting unit and a reference resistor selecting unit, and the thermistor selecting unit and the reference resistor selecting unit are respectively electrically connected with the controller.
4. The temperature collecting system for automobile according to claim 3, wherein said thermistor selecting unit is DG406, and said reference resistor selecting unit is MAX 4734.
5. A temperature acquisition system for a vehicle according to any of claims 1 to 4, wherein said integrated digitizer is MAX 6682.
6. The temperature acquisition system for the automobile as claimed in claim 1, wherein the acquisition module comprises a one-out-of-four analog switch chip; and the common output end of the one-out-of-four analog switch chip is connected with the input end of the signal conversion circuit, and the control end of the one-out-of-four analog switch chip is connected with the controller.
7. The temperature acquisition system for the automobile as claimed in claim 1, wherein a noise suppression circuit is further connected in the temperature acquisition system.
8. The temperature acquisition system for the automobile as claimed in claim 2, wherein the resistance value of the reference resistor is obtained by the following formula:
Rext=(Rmid*(Rmin+Rmax)-2Rmin*Rmax)/(Rmin+Rmax-2Rmid)，
the Rext is a resistance value of the reference resistor, the Rmin is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the upper limit temperature of the temperature measurement range, the Rmax is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the lower limit temperature of the temperature measurement range, and the Rmid is a resistance value of the thermistor corresponding to the temperature measurement range corresponding to the reference resistor at the middle temperature of the lower limit temperature and the upper limit temperature of the temperature measurement range.
9. A temperature acquisition method for an automobile according to any one of claims 1, 2, 3, 4, 6 to 7, comprising the following steps:
the automobile temperature acquisition steps are as follows:
installing an acquisition module at an acquisition point needing temperature on an automobile, wherein the acquisition module is used for acquiring the temperature of the temperature sampling point of the automobile, a signal conversion circuit is formed among the acquisition module, a selection unit, an integrated digital converter, a display module and a controller, and a noise suppression circuit is connected at the acquisition point;
after the signal conversion circuit and the noise suppression circuit are connected, starting a controller switch, selecting a plurality of reference resistors and a plurality of thermistors by the selection unit under the action of the controller, and adjusting the temperature measurement range of the integrated digital converter according to the thermistors selected by the selection unit, wherein the resistance values of the plurality of reference resistors are different and respectively correspond to one temperature measurement range; the integrated digital converter is connected with the selection unit so as to convert the resistance value of the selected thermistor corresponding to the temperature into a digital signal according to the selected reference resistor; the selection unit selects a thermistor at a temperature sampling point to be detected of the automobile, controls the selection unit to select a corresponding reference resistor according to the temperature change range of the temperature sampling point, and displays the temperature of the temperature sampling point through the display module according to a digital signal from the integrated digital converter;
and thirdly, displaying the temperature of the temperature sampling point by a display module and comparing the temperature with a normal value of the temperature of the point, and if the temperature value acquired by the point is abnormal, starting shutdown protection by a controller or controlling a temperature regulating system to regulate the temperature of the point by the controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104515615A (en) * | 2013-09-27 | 2015-04-15 | 北汽福田汽车股份有限公司 | Temperature acquisition system used for vehicle and vehicle with same |
| CN107302360A (en) * | 2017-06-16 | 2017-10-27 | 长沙变化率信息技术有限公司 | A kind of general-purpose simulation sample circuit |
| CN111351593A (en) * | 2018-12-20 | 2020-06-30 | 海鹰航空通用装备有限责任公司 | Unmanned aerial vehicle battery temperature detection system and method |
| CN111736026A (en) * | 2020-06-29 | 2020-10-02 | 深圳市京泉华科技股份有限公司 | Temperature rise test system and method |
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2020
- 2020-12-12 CN CN202011462169.0A patent/CN112556871A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515615A (en) * | 2013-09-27 | 2015-04-15 | 北汽福田汽车股份有限公司 | Temperature acquisition system used for vehicle and vehicle with same |
| CN107302360A (en) * | 2017-06-16 | 2017-10-27 | 长沙变化率信息技术有限公司 | A kind of general-purpose simulation sample circuit |
| CN111351593A (en) * | 2018-12-20 | 2020-06-30 | 海鹰航空通用装备有限责任公司 | Unmanned aerial vehicle battery temperature detection system and method |
| CN111736026A (en) * | 2020-06-29 | 2020-10-02 | 深圳市京泉华科技股份有限公司 | Temperature rise test system and method |
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