• 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:
    The gas sensor device (1) for measuring a target gas concentration comprises: a radiation source (3) for emitting radiation energy through a space (2) containing the target gas; a radiation receiver (4) for detecting the radiation energy emitted by the radiation source (3); a filter (5) which is associated with the radiation receiver (4) and passes radiation of a wavelength range corresponding to the target gas; and a control and evaluation system (6) which is connected to the radiation receiver (4) and which calculates the target gas concentration based on a detection signal applied to the control and evaluation system (6) by the radiation receiver. In order to achieve a gas sensor device (1) of this type, so that it operates safely in the long term, and to be able to supply it with a relatively low electrical energy expenditure, it is proposed that the sensor device of gas (1) is embodied as a non-dispersive infrared spectroscopy (NDIR) gas sensor device (1) comprising an infrared radiation source (3) as a radiation source and an infrared radiation receiver (4) as a radiation receiver, and that the infrared radiation source (3) of the NDIR gas sensor device (1) can operate with different powers.
    公开号:FR3023916A1
    申请号:FR1556694
    申请日:2015-07-16
    公开日:2016-01-22
    发明作者:Ralf Monkemoller
    申请人:Paragon AG；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a gas sensor device for measuring a concentration of target gas, comprising: a radiation source for emitting radiation energy through a space containing the target gas; a radiation receiver for detecting the radiation energy emitted by the radiation source; a filter which is associated with the radiation receiver and passes the radiation of a wavelength range corresponding to the target gas; and a control and evaluation system which is connected to the radiation receiver and which calculates the target gas concentration based on a detection signal applied to the control and evaluation system by the radiation receiver. Gas sensor devices of this type are increasingly used to monitor air quality, in particular to monitor outdoor air quality and / or air quality in enclosed spaces, in particular as well. motor vehicle interiors.
    [0002] When monitoring air quality in closed spaces, it is to be ensured that, in the event of a deterioration of this air quality, it is possible to react by taking the appropriate measures. In the automotive field, suitable gas sensor devices have been used for some time, including metal oxide sensors (MOS) for monitoring air to detect the presence of VOCs (volatile organic compounds). When the concentrations of these VOCs in the air of the passenger compartment of the vehicle are too high, the use of this type of gas sensor device automatically activates the ventilation of the vehicle to ensure the renewal of the air. In motor vehicles, air conditioning installations in which the refrigerant is carbon dioxide (CO2) are used more and more frequently. Since carbon dioxide, when its concentration in the cabin air increases, can cause fatigue and drowsiness in the driver, gas sensor devices are also used to monitor leaks in the installation. air conditioning. In these cases, the gas sensor device, which is implemented as a CO2 sensor device, must trigger an alarm in the event of an inadmissible concentration of CO2 in the air of the passenger compartment, or must act on a control device of a vehicle ventilation, with the aim of eliminating the risk of excessively high CO2 content in the cabin air. This could be achieved for example by increasing the flow of air in the passenger compartment, which has the effect of reducing the concentration of CO2 inside the passenger compartment of the vehicle. Document DE 10 2004 024 284 A1 discloses a method for monitoring the air quality in a vehicle interior, according to which a gas sensor device, adapted to detect CO2, must eliminate any risk for human beings. live in the passenger compartment of a parked vehicle. To this end, we monitor not only the CO2 content of the cabin air, but also the temperature of the passenger compartment. If, in the event of a relatively high temperature of the passenger compartment, a predefinable CO2 increase gradient is detected, it is assumed that a living being, for example a child or a pet, is in the passenger compartment. 'a vehicle. Here, the CO2 growth gradient is characteristic of breathing inside the vehicle.
    [0003] From the state of the art described at the beginning, the object of the invention is to propose a gas sensor device, intended to measure a target gas concentration, which can be produced with a relatively low expense in terms of technique. and design, which allows extremely reliable and accurate measurements to be made, especially under conditions where measures are necessary to eliminate the risks. According to the invention, this object is achieved by the fact that the gas sensor device is designed as a non-dispersive infrared spectroscopy (NDIR) gas sensor device comprising a source of infrared radiation, as a source of radiation, and an infrared radiation receiver as a radiation receiver, and in that the infrared radiation source of the NDIR gas sensor device is operable with different powers. Since the gas sensor device according to the invention is embodied as an NDIR gas sensor device, it is possible to guarantee a more reliable and more precise implementation, since the transverse sensitivity of NDIR gas sensor devices to insignificant gases for the measurement and especially the humidity of the air is very low compared to other gas sensor devices intended for the uses in question here, in particular devices equipped with metal oxide sensors. The NDIR gas sensor device includes the infrared radiation source and the infrared radiation receiver. In front of the infrared radiation receiver is placed the filter which passes to the infrared radiation receiver only the wavelength which is of interest for the measurement concerned. This wavelength is a function of the target gas to be monitored. For an NDIR gas sensor device intended to detect the CO2 content, this wavelength is, for example, 4.26 1.1m, since here is one of the absorption bands of CO2. In the case where the NDIR gas sensor device is used to monitor HC (hydrocarbons), a wavelength of for example 3.3 1.1m is chosen.
    [0004] The infrared radiation receiver of the NDIR gas sensor device measures the energy transmitted by the infrared radiation source to the infrared radiation receiver. If the target gas whose concentration is to be measured appears in the ray path between the infrared radiation source and the infrared radiation receiver, a portion of the radiation energy at the specific wavelength is absorbed by the target gas. lying on the ray path. In accordance with the Beer-Lambert law, this absorption depends inter alia on the average length of the optical path of the measurement path between the infrared radiation source and the infrared radiation receiver and the concentration of the target gas. The statement of the Beer-Lambert law is as follows: I = Io - 10 '- - d Here Io is the transmitted energy without target gas c is the concentration of the target gas d is the mean optical path length measuring path between the infrared radiation source and the infrared radiation receiver and is a constant which is a function of the target gas.
    [0005] The concentration of the target gas c is determined according to the formula above. Ideally, Io, d and E are constant. In this case, it would be sufficient to measure the energy I transmitted, using the infrared radiation receiver, and calculate the target gas concentration c using the formula. The higher the target gas concentration c, the lower the energy transmitted. This is important because all the influencing factors causing a decrease in energy transmission lead to values that are too high for the target gas concentration c. To obtain an accurate measurement result, a prerequisite is that the radiated power of the infrared radiation source is constant even over a very long period of time, for the wavelength specific to the intended measurement. On the other hand, the average length of the optical path of the measurement path between the infrared radiation source and the infrared radiation receiver must not be changed. For example, when reflecting surfaces are used to increase the quality of the detection signal of the NDIR gas sensor device, so that a larger portion of the radiation energy emitted by the infrared radiation source can be focused. on the infrared radiation receiver, it is very important that the reflective properties of the materials constituting the reflective surfaces are stable and do not change, even during a possibly considerable lifetime of the NDIR gas sensor device. Otherwise, a decrease in reflectivity or a decrease in the radiated power of the infrared radiation source would still be interpreted as a too high concentration of the target gas. Depending on the use of the NDIR gas sensor device according to the invention, a false alarm may then be triggered, which is of course to avoid. In order to reduce the aging of the infrared radiation source of the NDIR gas sensor device and also to reduce the electrical energy consumption of the NDIR gas sensor device, it is for example known from the state of the art to operate the infrared radiation source in pulsed mode. Thus, for some applications and functions, it is sufficient that an updated measurement value is available every 5 seconds. In this case, the infrared radiation source is activated only every 5 seconds, until it has reached its full radiation power. For this purpose, 500 to 1000 milliseconds are often sufficient. After a defined time interval, the reception power is then measured on the infrared radiation receiver, and the downstream control and evaluation device calculates the target gas concentration from the obtained detection signal. In the case where the NDIR gas sensor device is powered by a battery as a source of electrical energy, the pulsed operating mode, known from the state of the art, also causes an energy absorption which is too high. for many uses. To solve this problem, it is provided, in the case of the NDIR gas sensor device according to the invention, that the infrared radiation source of the NDIR gas sensor device can be powered with different powers. This allows for considerable additional energy savings.
    [0006] Thus, in the case where the NDIR gas sensor device is used for the detection of CO2 leaks from a vehicle air conditioning installation, it is for example useful and judicious to provide an alarm threshold value. which is greater than a target gas concentration or CO2 of 10,000 ppm (1.0% by volume). The upper limit of the measuring range which is useful for this purpose is often above 100 000 ppm (10.0% by volume). When it is desired to detect whether a living being is inside a passenger compartment, the NDIR gas sensor device requires a measuring range totally different from that required for the aforementioned detection of a CO2 leak of an installation air conditioning. If the NDIR gas sensor device is used to detect the presence of living beings in a passenger compartment, this requires a high resolution and accuracy of the detection signal characterizing the CO2 concentration in a concentration range up to 1000 ppm. (0.1% by volume). This will be illustrated with the following example: A sleeping infant is breathing at approximately 20 breaths per minute. The volume of air per breath is about 100 ml. Therefore, for an enrichment of the respiratory air of 0,04% in volume of CO2, the infant rejects 0,08 1 of CO2 per minute. For one hour, this corresponds to about 5 1 of CO2. When the indoor space to be monitored has a volume of about 5 m3, that is to say 5000 1, the infant caused an increase in the CO2 concentration of 0.1% by volume of CO2 at the end of one hour. If it is assumed that in full sunlight a motor vehicle achieves critical temperatures of more than 60 degrees C in the passenger compartment within half an hour, the NDIR gas sensor device must be able to reliably detect an increase in 0.05% by volume (500 ppm) of the CO2 concentration. Without the operation, provided according to the invention, of the infrared radiation source of the NDIR gas sensor device with different powers, an NDIR gas sensor device known from the state of the art would have a resolution that is clearly too low in a measuring range between 400 ppm and 5000 ppm. In order to illustrate the advantages of the NDIR gas sensor device according to the invention, it should be added that one of the main energy consumers of such an NDIR gas sensor device is the source of infrared radiation. For an NDIR gas sensor device with a particularly low power consumption, it is therefore necessary to change the operating mode of the infrared radiation source, as known from the state of the art. For this purpose, it is assumed that the radiation energy received in the infrared radiation receiver of the NDIR gas sensor device is proportional to the radiation energy emitted by the infrared radiation source. In turn, the radiation energy emitted by the infrared radiation source depends directly on the electrical energy used for the operation of the infrared radiation source. Therefore, a relatively large transmitted radiation energy means that there is also a relatively large received radiation energy and thus a relatively large or sharp detection signal of the infrared radiation receiver. Such a relatively large detection signal improves the signal-to-noise ratio, so that the measurement result is more accurate and has better resolution. The radiation energy W transmitted from the infrared radiation source to the infrared radiation receiver is proportional to the product of the radiated power I o and the radiation duration T. In order to improve the quality of the signal, it would be possible to increase the radiated power and / or the radiation duration. To reduce the energy absorption of the NDIR gas sensor device, it would be possible to reduce the radiated power and / or the radiation duration. For this purpose, the reduction could be provided in such a way that the detection signal emitted by the infrared radiation receiver still meets the requirements concerning the resolution, the accuracy and the signal-to-noise ratio. For this purpose, the NDIR gas sensor device according to the invention is provided with a control and evaluation system which makes it possible to operate the infrared radiation source with different radiated powers. For this, a voltage source provided for the power supply of the infrared radiation source can be adjustable, knowing that the adjustment is made by the control and evaluation system. The respective operating voltage of the voltage source adjusts different levels of the radiated power of the infrared radiation source.
    [0007] Advantageously, the NDIR gas sensor device can be used in at least two modes of operation, and in this case the infrared radiation source operates with a very low power in a first mode of operation and with a high power in a second mode of operation. operating mode. In the first mode of operation, the NDIR gas sensor device according to the invention has a relatively low energy consumption. In this mode of operation, a reduced signal quality is voluntarily accepted and thus the absence of a relatively high resolution, precision and signal / noise ratio. In this mode of operation, priority is given to the relatively low power consumption. In the second mode of operation, the NDIR gas sensor device according to the invention works with a relatively high energy consumption. In this second mode of operation, priority is given to a relatively high quality of the detection signal, i.e., high resolution, high precision, and high signal-to-noise ratio thereof. As mentioned above, it is known from the state of the art to operate at intervals the infrared radiation source of an NDIR gas sensor device, in order to reduce the energy consumption of the latter. If a reduced measurement rate is sufficient, then the infrared radiation source is only briefly activated to perform each individual measurement. Between measurements, the source of infrared radiation is cut off and therefore does not consume electrical energy. The known intermittent operation further has the advantage that at times when the infrared radiation source is cut off, the signal of the infrared radiation receiver of the NDIR gas sensor device can be collected as a reference point for the evaluation of signal that follows. As mentioned above, there are applications where it is necessary to obtain a minimum energy consumption with a predetermined minimum measurement rate, for example when detecting CO2 leaks from an air conditioning installation operating with CO2. as a refrigerant, in a parked vehicle. The alarm threshold is here for example at a CO2 concentration of 30 000 ppm in the air of the passenger compartment of the vehicle. With a permissive inaccuracy of a few percent, the alarm threshold value must trigger the alarm. The basic content of CO2 in the air is about 380 ppm. In a passenger car occupied by several passengers or persons, the CO2 concentration can reach values up to 1900 ppm. In all cases, the difference with the alarm threshold value of 30 000 ppm mentioned above remains significant. In the example described above, the factor is greater than 15. For example, in a parked vehicle, the average absorbed current of 50 1.1A at 12 V DC (W = 0.6 mWh) must not be exceeded in the state of rest. At the same time, it is necessary to reach a minimum measurement rate of one measurement per minute. For each measurement, therefore, only 0.6 mWh / 60 = 0.01 mWh of electrical energy is available. An infrared radiation source with a rated power of 400 mW could operate for 90 ms with this available electrical energy. However, a typical infrared radiation source for the use of NDIR devices reaches its operating temperature, and thus its total radiated power, only after a few hundred milliseconds. As a result, the reduction of the radiation duration of, for example, 300 ms in the second mode of operation described above to 90 ms in the first mode of operation described above implies a significant decrease in the radiated power and consequently a significant reduction in the quality of the signal. This does not make it possible to reach the required measurement tolerances with respect to the alarm threshold value. For the NDIR gas sensor device according to the invention, these measurement tolerances are attained only by the fact that the infrared radiation source of the NDIR device can operate with different powers. According to an advantageous improvement of the NDIR gas sensor device according to the invention, it is envisaged that the NDIR device can be switched from the first mode of operation to the second mode of operation by its control and evaluation system, as a function of detection signals collected therein when the NDIR gas sensor device is in the first mode of operation. Switching from the first to the second operating mode can be provided in particular when the control and evaluation system detects that a predefined threshold value of the target gas concentration is reached or exceeded.
    [0008] According to another useful improvement of the NDIR gas sensor device according to the invention, it can be switched from the first mode of operation to the second mode of operation by its control and evaluation system, if it is detected in the control and evaluation system that a predefined threshold value of the gradient or increase of the target gas concentration is reached or exceeded. To limit the risks, it can be useful and advantageous to trigger, using the control and evaluation system of the NDIR gas sensor device, an alarm installation and / or a ventilation device or a similar system, if, in the second mode of operation of the NDIR gas sensor device, the control and evaluation system thereof detects that a predefinable alarm value is reached or exceeded.
    [0009] In order to ensure that the NDIR gas sensor device according to the invention, whenever it is judicious and possible, is in its first mode of operation which goes hand in hand with a low energy consumption, it is advantageous that the NDIR gas sensor device according to the invention can be brought back by its control system and evaluation of its second mode of operation to its first mode of operation, if it is detected in the second mode of operation of the NDIR device, by means of of the control and evaluation system, whether the threshold value set for switching from the first to the second operating mode of the NDIR device, or another threshold value set for switching from the second to the first operating mode, is reached or exceeded towards over there. In order to avoid in certain applications that there are permanently switches from the first to the second mode of operation and vice versa, it is advantageous for the control and evaluation system of the NDIR gas sensor device according to the invention to allow to adapt the predefinable threshold value for the first operating mode, for switching to the second operating mode, or the predefinable threshold value for the second operating mode, for switching to the first operating mode of the sensor device NDIR gas, if, in the second operating mode of the NDIR gas sensor device, it is detected by means of the control and evaluation system, that the predefinable alarm threshold value is not reached for a period of predefinable time from the switching of the first to the second operating mode of the NDIR gas sensor device. As explained above, the NDIR gas sensor device according to the invention described above can be advantageously used to measure the concentration of CO2 or the concentration of HC in the passenger compartment of a vehicle. According to a method according to the invention for the use of an NDIR gas sensor device, preferably an NDIR gas sensor device in one of the embodiments described above, there are provided at least two modes of the NDIR device, and in each state of operation of the NDIR gas sensor device, an infrared radiation source of the NDIR device is supplied with a different power, knowing that in a first mode of operation the source of infrared radiation is supplied with a low power, and in a second mode of operation it is fed with a high power. Suitably, when carrying out the method according to the invention described above, it is provided to switch the NDIR gas sensor device from one mode of operation to another, whenever predefined threshold values are reached or exceeded downwards or upwards. The present invention will be described in detail below with the aid of an embodiment, with reference to the drawing, the single figure of which illustrates an exemplary embodiment of a gas sensor device according to the invention for to measure a target gas concentration. An embodiment of a gas sensor device 1 shown in the single figure is used to measure a concentration of target gas, for example in a space 2. The space 2 may for example be the passenger compartment 2 of a vehicle automobile. The gas sensor device 1 is designed as a nondispersive infrared spectroscopy (NDIR) gas sensor device 1 and comprises a source of infrared radiation 3 which makes it possible to emit infrared radiation energy through space or space. cockpit 2 containing a target gas, for example carbon dioxide (CO2). An infrared radiation receiver 4 is disposed at a distance from the infrared radiation source 3 of the NDIR gas sensor device 1. This infrared radiation receiver 4 makes it possible to detect the infrared radiation energy emitted by the infrared radiation source 3 through the space or the cabin 2.
    [0010] In the radiation path, between the infrared radiation source 3 on the one hand and the infrared radiation receiver 4 on the other hand, there is provided a filter 5 which is associated with the infrared radiation receiver 4 and is designed to pass the radiation of a range of wavelengths that corresponds to the target gas. For this purpose, in the case where CO2 is provided as the target gas, a range of wavelengths of about 4.26 μm is chosen, because here one of the absorption bands of CO2 is located. If the target gas consists of hydrocarbons (HC), a range of wavelengths of, for example, 3.3 μm is chosen. Both the infrared radiation source 3 and the infrared radiation receiver 4 of the NDIR gas sensor device 1 are connected to a control and evaluation system 6. In this control and evaluation system 6, the gas concentration target can be calculated on the basis of a detection signal which is applied by the infrared radiation receiver 4 to the control and evaluation system 6. On the other hand, the control and evaluation system 6 of the sensor device NDIR gas 1 makes it possible to operate the infrared radiation source 3 of the latter with different powers. In the exemplary embodiment shown, the control and evaluation system 6 of the NDIR gas sensor device 1 is further connected to an alarm system 7 and to a ventilation device 8. In the case where the calculated value in the control and evaluation system 6 for the target gas concentration exceeds a predefined limit value, the control and evaluation system 6 triggers the alarm installation 7, so that the risks for persons lying in in the space or in the cockpit 2 can be reduced or discarded. In addition to or instead of this, the control and evaluation system 6 can also start the ventilation device 8 when the limit value is reached or exceeded, and in this case the operation of the ventilation device 8 makes it possible to returning the target gas concentration in the space or cabin 2 within a range of allowable values. In the exemplary embodiment shown, the NDIR gas sensor device 1 shown in the figure can work in two different modes of operation. In a first mode of operation, the NDIR gas sensor device 1 works with a relatively low power consumption. In this first mode of operation, a reduced signal quality is voluntarily accepted and therefore a resolution, a precision and a high signal-to-noise ratio are dispensed with. The priority of this first mode of operation is the relatively low energy consumption. In the second mode, the operation of the NDIR gas sensor device 1 is accompanied by a relatively high energy consumption. In this second mode of operation, priority is given to a relatively high signal quality, with high resolution, precision, and signal-to-noise ratio. In the first mode of operation, the infrared radiation source 3 of the NDIR gas sensor device 1 is supplied with low power by the control and evaluation system 6. In the second mode of operation, the infrared radiation source 3 is fed correspondingly with high power by the control and evaluation system 6. The essential aspect of the operation of the NDIR gas sensor device 1 is the transition from the first mode of operation to the second mode of operation and vice versa. For this purpose, a first threshold value of the predefinable target gas concentration is recorded in the control and evaluation system 6. Compared with an alarm threshold value, also predefinable, this first threshold value of the target gas concentration is set at such a low level that because of the difference between this first threshold value and the alarm threshold value, it is in all cases guaranteed that switching from the first operating mode to the second operating mode is performed well. before the alarm threshold value of the target gas concentration is reached. If, in the first mode of operation of the NDIR gas sensor device 1, the control and evaluation system 6 detects that the target gas concentration has reached or exceeded the first predefinable threshold value, the control and evaluation system 6 switches the NDIR gas sensor device 1 from the first mode of operation to the second mode of operation. The infrared radiation source 3 then works in the second mode of operation of the NDIR gas sensor device 1, with a significantly higher radiated power. Thus, it is ensured that the quality of the detection signal transmitted by the infrared radiation receiver 4 to the control and evaluation system 6 is significantly improved in the second mode of operation, and this already in a range of the target gas concentration. which is very far from a risky beach. When, with the second operating mode of the NDIR gas sensor device 1, the target gas concentration in the space or the passenger compartment 2 increases until it reaches or exceeds the predefined alarm threshold value, the control system and 6 triggers the alarm installation 7, and at the same time it is possible to activate the ventilation device 8 which ensures by ventilation of the space or the cabin 2 that the concentration of target gas does not increase further.
    [0011] If a third threshold value, which can also be predefined for the target gas concentration and can be stored in the control and evaluation system 6, is exceeded downward, while the NDIR gas sensor device 1 is in the second mode of operation, the control and evaluation system 6 switches the gas sensor device NDIR 1 to bring it back into the first mode of operation. If, after a switching of the NDIR gas sensor device 1 in its second operating mode, the alarm threshold value predefined and stored in the control and evaluation system 6 is not reached, a new first threshold value is calculated, which is greater than the old first threshold value; this new first threshold value is recorded in the control and evaluation system 6, and then the control and evaluation system 6 switches the gas sensor device NDIR 1 to bring it back to the first mode of operation. Thus, this adaptation or increase of the first threshold value which is provided for the switching of the NDIR gas sensor device 1 from its first to its second mode of operation, prevents the NDIR gas sensor device 1 from changing constantly between the first and second operating modes. the second mode of operation. During the operation of the NDIR gas sensor device 1 described above, it is obtained that during most of its service life its infrared radiation source 3 can operate with very low electrical power requirements. The radiated power of the infrared radiation source 3 of the NDIR gas sensor device 1 is increased only in the relatively rare cases where the first predefined threshold value of the target gas concentration is exceeded. Only in these cases is the higher quality detection signal needed, since this higher signal quality is provided by the much higher radiant power of the infrared radiation source 3 of the sensor device. of NDIR gas 1.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A gas sensor device for measuring a target gas concentration, comprising: a radiation source (3) for emitting radiation energy through a space (2) containing the target gas; a radiation receiver (4) for detecting the radiation energy emitted by the radiation source (3); a filter (5) which is associated with the radiation receiver (4) and passes radiation of a wavelength range corresponding to the target gas; and a control and evaluation system (6) which is connected to the radiation receiver (4) and which calculates the target gas concentration based on a detection signal applied to the control and evaluation system (6) by the radiation receiver (4), characterized in that the gas sensor device (1) is designed as a non-dispersive infrared spectroscopy (NDIR) gas sensor device (1) comprising a source of infrared radiation (3) as a radiation source and an infrared radiation receiver (4) as a radiation receiver, and in that the infrared radiation source (3) of the NDIR gas sensor device (1) is operable with different powers.
    [0002]
    2. A gas sensor device according to claim 1, characterized in that it can operate in a first mode of operation, wherein the source of infrared radiation (3) is fed with a low power, and in a second mode of operation in which the infrared radiation source (3) is fed with a high power.
    [0003]
    Gas sensor device according to claim 2, characterized in that it can be switched from the first mode of operation to the second mode of operation by its control and evaluation system (6), as a function of the detection signals collected. in it when the NDIR gas sensor device (1) is in the first mode of operation.
    [0004]
    4. Gas sensor device according to claim 3, characterized in that it can be switched from the first operating mode to the second operating mode by its control and evaluation system (6), if it is detected in the control and evaluation system (6) that a predefined threshold value of the target gas concentration is reached or exceeded.
    [0005]
    5. Gas sensor device according to claim 3 or 4, characterized in that it can be switched from the first mode of operation to the second mode of operation by its control and evaluation system (6), if it is detected. in the control and evaluation system (6) that a predefined threshold value of the gradient or increase of the target gas concentration is reached or exceeded.
    [0006]
    Gas sensor device according to one of Claims 3 to 5, characterized in that its control and evaluation system (6) makes it possible to switch on an alarm system (7) and / or an alarm device. ventilation (8) or the like, if, in the second operating mode of the NDIR gas sensor device (1), it is detected in the control and evaluation system (6) thereof, that a threshold value preset alarm is reached or exceeded.
    [0007]
    7. Gas sensor device according to one of claims 3 to 6, characterized in that its control and evaluation system (6) makes it possible to reduce the NDIR gas sensor device (1) of its second operating mode in its first mode of operation, if it is detected in the second operating mode of the NDIR gas sensor device (1), by means of the control and evaluation system (6), that the threshold value set for the switching from the first to the second operating mode of the NDIR gas sensor device (1), or another threshold value set for switching from the second to the first operating mode, is reached or exceeded downwards.
    [0008]
    8. Gas sensor device according to one of claims 3 to 7, characterized in that its control and evaluation system (6) makes it possible to adapt the predefinable threshold value for the first operating mode, with a view to switching. in the second operating mode, or the predefinable threshold value for the second operating mode, for switching to the first operating mode of the NDIR gas sensor device (1), if in the second operating mode of the sensor device NDIR gas (1), it is detected by means of the control and evaluation system (6) that the predefinable alarm threshold value is not reached for a predefinable period of time from the switching of the first to the second operating mode of the NDIR gas sensor device (1).
    [0009]
    9. Use of a gas sensor device according to one of claims 1 to 8 for measuring the concentration of CO2 or the concentration of HC in the passenger compartment (2) of a motor vehicle.
    [0010]
    10. A method for operating an NDIR gas sensor device, preferably an NDIR gas sensor device according to one of claims 1 to 8, wherein there is provided at least two modes of operation of the NDIR gas sensor device (1 ), and in which, in each state of operation of the NDIR gas sensor device (1), an infrared radiation source (3) of the NDIR gas sensor device (1) is supplied with a different power, knowing that in a first operating mode the infrared radiation source (3) is powered with a low power, and in a second operating mode it is fed with a high power.
    [0011]
    11. The method of claim 10, wherein a switching of the NDIR gas sensor device (1) from one operating mode to another takes place, if preset threshold values are reached or exceeded downwards or upwards.
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    WO2018002551A1|2018-01-04|Method and system for detecting the absence of under engine protection
    同族专利:
    公开号 | 公开日
    DE102014010713A1|2016-01-21|
    CN105277501A|2016-01-27|
    US9322774B2|2016-04-26|
    US20160018321A1|2016-01-21|
    CN105277501B|2020-05-22|
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    US20070017458A1|2005-07-13|2007-01-25|Robert Frodl|Gas Sensor Assembly and Measurement Method With Early Warning Means|
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    法律状态:
    2016-07-22| PLFP| Fee payment|Year of fee payment: 2 |
    2017-07-20| PLFP| Fee payment|Year of fee payment: 3 |
    2018-01-12| PLSC| Search report ready|Effective date: 20180112 |
    2018-07-23| PLFP| Fee payment|Year of fee payment: 4 |
    2019-07-24| PLFP| Fee payment|Year of fee payment: 5 |
    2020-07-27| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-01| RX| Complete rejection|Effective date: 20210827 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014010713.2A|DE102014010713A1|2014-07-19|2014-07-19|"Gas sensor arrangement for measuring a target gas concentration"|
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