• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Temperature network system comprising at least one thermocouple element with a measuring part (2) and a reference part (4) having a reference temperature TREF for the thermocouple element, wherein the system comprises a temperature measuring circuit (6) adapted to determine the temperature difference between the measuring part and the reference part. The system comprises a temperature sensor (8) arranged in connection with the reference part and adapted to measure a control temperature TOBD, the system further comprising a calculation unit (10) adapted to calculate AT = TREF -TOBD, to compare the absolute value of AT with one or fl your predetermined threshold levels ( TTH1, TTHQ) and to generate a diagnostic signal (12) depending on the result of the comparison. (Fig. 1)
    公开号:SE1050545A1
    申请号:SE1050545
    申请日:2010-06-01
    公开日:2011-12-02
    发明作者:Ola Stenlaaaas；Fredrik Straaaat
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    where) there is thus a potential difference between the two ends, which is measurable with the measuring instrument. If the temperature in the measuring instrument (often referred to as the "cold soldering point") is known and the relationship between temperature difference and voltage for the two materials is known, one can use a formula to calculate the temperature in the measuring point, a task performed by the measuring instrument.
    The voltage from a thermocouple element is small (typically a few tens of microvolts per degree temperature difference), therefore the measuring instrument is required to be sensitive.
    Thermocouples are manufactured in a number of standard materials. In many cases the material properties are so good that one can assume a simple linear relationship between stress and temperature. This relationship is usually called the Seebeck coefficient.
    The most common type of thermocouple element is wire thermocouple type K. They consist of two conductors: Chromel (a nickel-chromium alloy) and Alumel (a nickel-aluminum alloy). At room temperature, the electromotive voltage of the chromel / alumel combination is approximately 41 uV / ° C.
    Tin elements generally provide an accurate temperature measurement, are robust and have a fast response time.
    The temperature in the measuring instrument, ie. in the cold soldering place, can be determined in a number of different ways. A common way is to use a terrnistor, ie. a temperature-dependent resistor, which is arranged in connection with the cold soldering point. Another method is described in EP-1,087,217 where a temperature sensitive transistor is used instead.
    US-3,911,745 discloses a thermocouple element comprising a resistor with a temperature dependent resistance which is used to compensate for temperature changes in the cold soldering point.
    There are thus a number of different ways to measure the temperature in the cold soldering point and compensate for any temperature changes in the cold soldering point. Since the temperature network of the thermal element is based on the temperature difference between the hot and the cold soldering point, the reliability of the measurement depends, among other things, on how accurate the measurement of the temperature in the cold soldering point is. In the prior art described above, a number of different methods have been proposed for determining the temperature at the cold soldering point, all of which have the disadvantage that if an incorrect temperature value for the cold soldering point is measured, for example due to the temperature sensor being faulty or damaged, the tin element will deliver an incorrect temperature.
    The object of the present invention is to provide a system and a method which gives an indication of whether such an error exists.
    Summary of the Invention The above object is achieved by the invention defined by the independent claims.
    Preferred embodiments are defined by the dependent claims.
    The invention thus comprises a temperature network system comprising at least one thermocouple element with a measuring part and a reference part having a reference temperature TREF for the thermocouple element. The system further comprises a temperature network circuit adapted to determine the temperature difference which exists between the measuring part and the reference part and based on this determine the temperature of the measuring part. Furthermore, a temperature sensor is arranged in connection with the reference part and adapted to measure a control temperature TOBD, the system further comprising a calculation unit adapted to calculate AT = THREE; - TOBD, to compare the absolute value of AT with one or fl your predetermined threshold levels and to generate a diagnostic signal depending on the result of the comparison.
    The invention further comprises a method for a temperature netting system comprising at least one terino element with a measuring part and a reference part having a reference temperature TREF for the terrno element.
    The method comprises: determining the reference temperature TREF for the thermocouple; Determining a control temperature TOBD with a temperature sensor arranged in connection with the reference part; calculate AT = TREF - TOBD; compare the absolute value of AT with one or fl your predetermined threshold levels, and generate a diagnostic signal depending on the result of the comparison.
    An advantage of the present invention is that already included components can be used for diagnostics without the need to introduce new components into the system.
    Brief Description of the Drawings Figure 1 shows a schematic block diagram of the temperature networking system according to the present invention.
    Figure 2 shows a schematic block diagram of a temperature network circuit according to the present invention.
    Figure 3 is a fate diagram illustrating the method of the present invention.
    Detailed Description of Preferred Embodiments of the Invention With reference to the figures, the invention will now be described in more detail.
    Figure 1 shows a schematic block diagram of the temperature measurement system according to the present invention and which comprises at least one thermocouple element with a measuring part 2 and a reference part 4 having a reference temperature TRE; for the thermocouple. The system further comprises a temperature network circuit 6 adapted to determine the temperature difference which exists between the measuring part and the reference part and based on this determine the temperature of the measuring part.
    A temperature sensor 8 is arranged in connection with the reference part and adapted to measure a control temperature TOBD, the system further comprising a calculation unit (10) adapted to calculate AT = TREF - TOBD, to compare the absolute value of AT with one or fl your predetermined threshold levels TTH1, TTH; (not shown in Figure 1) and to generate a diagnostic signal (12) depending on the result of the comparison. The temperature sensor can, for example, consist of a thermistor, for example of the NTC type. According to a preferred embodiment, the system is adapted to be arranged in connection with an exhaust system of a vehicle. Preferably, the system comprises three thermocouples with a common reference part. Within the scope of the inventive concept, eller more or fewer thermocouples can be arranged depending on the application in question.
    In the preferred case, the three measuring parts are arranged along the exhaust pipe of the vehicle, for example in connection with the catalyst of the vehicle. By arranging three measuring parts and making pairwise measurements between these, a simple indication is obtained if any of the measuring parts emits deviating values, ie. an indication that the respective measuring part is working correctly. In this application, the temperature can vary between -40 and 800 ° C, and more specifically in the range of 150 - 600 ° C.
    The temperature sensor 8 and the calculation unit 10 are preferably arranged in a microprocessor 14 which is arranged in connection with the temperature network circuit 6.
    The microprocessor thus receives measurement signals from the temperature measurement circuit 6, makes any further processing of the signals and then delivers measurement data to a general bus system (not shown).
    The temperature network circuit 6, the reference part 4 and the microprocessor with the temperature sensor 8 and the calculation unit 10 are according to a preferred embodiment arranged on a mounting unit 16 with a maximum dimension which is of the order of 50 mm. The mounting unit is a nested unit that is adapted to be mounted in connection with the vehicle's exhaust system. Even embodiments where the maximum dimension exceeds 50 mm are of course possible within the scope of the inventive idea as stated in the claims. For example, the mounting unit may have an elongated shape with a length exceeding 50 mm and e.g. be adapted to the space in which it is to be mounted.
    The measurement to validate the tern element can be made partly in connection with the start of the vehicle when the exhaust gas temperature is relatively low and when the microprocessor has not yet been heated by its own energy consumption. It is also possible to carry out measurements during normal operation. One should then take into account the energy consumption of the microprocessor and the heat it generates. 10 15 20 25 30 However, this does not have a decisive effect on the measurement, but the temperature measurement system provides reliable diagnostic signals even in this case.
    An embodiment of the invention will now be described with reference to Figure 2 where a schematic block diagram of a microprocessor according to the present invention is shown.
    According to this embodiment, two threshold levels TTH1, TTHg are used. If the absolute value of AT exceeds the minimum threshold level TTH1, a first diagnostic signal indicating a smaller deviation between the temperatures TREF and TOBD is generated, and if the absolute value of AT exceeds the largest threshold level TTHQ, a second diagnostic signal is generated indicating a larger deviation between the temperatures TREF and TOBD.
    For example, TTH1 can be selected in the range +10 - + 40 ° C, for example to 20 ° C.
    For example, TTH; selected in the range +80 - + 200 ° C, for example to ° 120 ° C.
    Of course, the threshold levels can be selected to other values outside the ranges set forth herein which are selected in view of the preferred application for measuring exhaust temperatures.
    Furthermore, fl more than two threshold levels can be used. Alternatively, the diagnostic signal may be directly dependent on the absolute amount of AT, for example, AT may appear directly from the diagnostic signal.
    The invention also comprises a method for a temperature measuring system comprising at least one tern element with a measuring part 2 and a reference part 4 having a reference temperature TREF for the tern element. The method will now be described with reference to Fig. 3.
    The method comprises: determining the reference temperature TREF for the thermocouple element; determining a control temperature TOBD with a temperature sensor arranged in connection with the reference part; calculate AT = TREF - TOBD; compare the absolute value of AT with one or fl your predetermined threshold levels TTH, and generate a diagnostic signal 12 depending on the result of the comparison. If the absolute value for AT is less than the threshold value TTH, the measurement is judged to be correct, ie. the reference temperature is correctly determined. The method further comprises determining the temperature difference that exists between the measuring part and the reference part and based on this determining the temperature of the measuring part.
    According to a further embodiment, the method comprises using two threshold levels (TTH1, TTHQ) and if the absolute value of AT exceeds the minimum threshold level TTH1, an initial diagnostic signal is generated indicating a smaller deviation between the temperatures TREF and TOBD, and if the absolute value of AT exceeds the largest threshold level; a second diagnostic signal is generated indicating a larger deviation between the temperatures TREF and TOBD.
    The present invention is not limited to the above-described preferred embodiments.
    Various alternatives, modifications and equivalents can be used. The above embodiments are therefore not to be construed as limiting the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (11)
    [1]
    A temperature measuring system comprising at least one thermocouple with a measuring part (2) and a reference part (4) having a reference temperature TREF for the thermocouple, said temperature measuring system further comprising a temperature measuring circuit (6) adapted to determine the temperature difference between the measuring part and the reference part. the temperature of the measuring part, characterized in that the system comprises a temperature sensor (8) arranged in connection with the reference part and adapted to measure a control temperature TOBD, the system further comprising a calculation unit (10) adapted to calculate AT = TREF - TOBD, to compare the absolute value of AT with one or fl your predetermined threshold levels (TTH, TTH1, TTHZ) and to generate a diagnostic signal (12) depending on the result of the comparison.
    [2]
    Temperature measurement system according to claim 1, wherein the temperature sensor (8) and the calculation unit (10) are arranged in a microprocessor (14).
    [3]
    Temperature netting system according to claim 1 or 2, wherein the system comprises three thermocouples with a common reference part.
    [4]
    Temperature measurement system according to any one of the preceding claims, wherein the system is adapted to be arranged in connection with an exhaust system of a vehicle.
    [5]
    Temperature measuring system according to any one of the preceding claims, wherein the temperature netting circuit (6), the reference part (4) and the temperature sensor (8) are arranged on a mounting unit (16) with a maximum dimension which is 50 mm.
    [6]
    Temperature mesh system according to any preceding claim, wherein the temperature sensor is a thermistor.
    [7]
    The temperature netting system of claim 6, wherein the thermistor is of the NTC type.
    [8]
    Temperature network system according to any preceding claim, wherein two threshold levels (TTH1, TTHQ) are used and if the absolute value of AT exceeds the minimum threshold level TTH1, a first diagnostic signal is generated indicating a minor deviation between the temperatures TREF and TOBD, and the absolute value of AT exceeds the largest threshold level TTH; results, a second diagnostic signal is generated indicating a larger deviation between the temperatures TREF and TOBD.
    [9]
    Method for a temperature measuring system comprising at least one thermocouple element with a measuring part (2) and a reference part (4) having a reference temperature TREF for the thermocouple element, characterized in that the method comprises: determining the reference temperature TREF for the thermocouple element; determining a control temperature TOBD with a temperature sensor arranged in connection with the reference part; calculate AT = TREF - TOBD; compare the absolute value of AT with one or fl your predetermined threshold levels, and generate a diagnostic signal (12) depending on the result of the comparison.
    [10]
    A method according to claim 6, wherein the method comprises: determining the temperature difference that exists between the measuring part and the reference part and based on this determining the temperature of the measuring part.
    [11]
    A method according to any one of claims 9-10, wherein the method comprises: using two threshold levels (TTH1, TTHZ) and if the absolute value of AT exceeds the minimum threshold level TTH1, a first diagnostic signal is generated indicating a minor deviation between the temperatures TREF and TOBD, and if the absolute value of AT exceeds the largest threshold level TTH; a second diagnostic signal is generated indicating a larger deviation between the temperatures TREF and TOBD.
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    同族专利:
    公开号 | 公开日
    SE534904C2|2012-02-14|
    WO2011152776A1|2011-12-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4157663A|1978-04-25|1979-06-12|The Boeing Company|Automatic thermocouple reference junction compensator|
    US4590472A|1982-12-01|1986-05-20|General Electric Company|Analog signal conditioner for thermal coupled signals|
    JPS6053825A|1983-09-02|1985-03-27|Nissan Motor Co Ltd|Temperature measuring device using thermocouple|
    FR2701568B1|1993-02-10|1995-05-05|Siemens Automotive Sa|Method and device for digital measurement of a voltage varying within a predetermined voltage range and their uses.|
    US5492482A|1994-06-07|1996-02-20|Fluke Corporation|Compact thermocouple connector|EP3070446B1|2015-03-18|2019-02-13|ENDRESS + HAUSER WETZER GmbH + Co. KG|Thermo wire testing circuit and method|
    FR3042861A1|2015-10-26|2017-04-28|Valeo Systemes De Controle Moteur|TEMPERATURE SENSOR FOR A MOTOR VEHICLE COMPRISING A THERMOCOUPLE|
    GB2571524A|2018-02-28|2019-09-04|Continental Automotive Gmbh|Electric device comprising a printed circuit board and method for determining local temperatures at different measurement points of the printed circuit boar|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050545A|SE534904C2|2010-06-01|2010-06-01|Temperature measurement system and method for a temperature measurement system comprising at least one thermocouple|SE1050545A| SE534904C2|2010-06-01|2010-06-01|Temperature measurement system and method for a temperature measurement system comprising at least one thermocouple|
    PCT/SE2011/050655| WO2011152776A1|2010-06-01|2011-05-26|Temperature measurement system and method for a temperature measurement system comprising at least one thermocouple|
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