• 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 invention relates to a measuring circuit (1) for determining a resistance value of a sensor resistance component (250). It has a voltage supply terminal (20) which is electrically connectable to one pole of a supply voltage source (10), at least two measuring resistor components (100) with preferably different resistance values, one or more sensor resistor terminals (200), each of which is arranged with a Sensor resistor component (250), a select multiplexer circuit (300) configured to electrically connect a selected one of the at least two sense resistor devices (100) in series with a selected one of the one or more sensor resistor terminals (200), at least one voltage measuring device (400) configured to apply a voltage between a pole of the selected measurement resistor device (100) and a pole of the supply voltage source (10) and a voltage between a pole of the selected sensor resistor terminal (200) and a pole of the Ve 10), and a computing unit (500) adapted to measure the resistance of a sensor resistance device (250) connected to the selected sensor resistor terminal (200) from the supply voltage, the resistance value of the selected measurement resistor device (100), to the voltage the selected sense resistor device (100) and the voltage at the selected sensor resistor port (200).
    公开号:CH707219B1
    申请号:CH01239/13
    申请日:2013-07-10
    公开日:2018-05-31
    发明作者:Theisen Johannes；Guenther Uwe；Mewes Rainer；Kneer Andreas
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    Description: The present invention relates to a measuring circuit for determining a resistance value of a sensor resistor component and a method for determining a resistance value of a sensor resistor component.
    PRIOR ART [0002] In control devices, for example for controlling machines, systems or in the automotive field, measured values must be determined. Many measured values are not determined directly, but indirectly, with the help of sensor resistor components. Since there is a relationship between the resistance value of the sensor resistor component and the measured value, the measured value can be calculated with the aid of the resistance value of the sensor resistor component. For example, NTC and PTC resistor components, whose resistance values are temperature-dependent, should be noted. The temperature can thus be calculated back from the resistance values. In order to determine the resistance value of the sensor resistor component, a measuring resistor component can be connected to the sensor resistor component as a voltage divider. The resistance value of the measuring resistor component must be adapted to the order of magnitude of the resistance value of the sensor resistor component. The resistance value of the sensor resistor component can be determined with the aid of the measured voltage drops at the individual resistor components. However, measurements with several sensor resistor components and measuring resistor components prove to be complex.
    It is desirable to develop a way with which resistance values of sensor resistor components can be determined in the simplest, most flexible way possible.
    DISCLOSURE OF THE INVENTION According to the invention, a measuring circuit for determining a resistance value of a sensor resistor component and a method for determining a resistance value of a sensor resistor component are proposed with the features of the independent claims. Advantageous refinements are the subject of the dependent claims and the following description.
    Advantages of the Invention A measuring circuit according to the invention for determining a resistance value of a sensor resistor component has a selection multiplexer circuit, by means of which a selected one of at least two measuring resistor components is electrically connected in series with a selected one or more sensor resistor connections. In order that the resistance value of a sensor resistor component connected to the selected sensor resistor connection can be determined, the resistance value of the selected measuring resistor component should be adapted to the order of magnitude of the resistance value to be determined. The preferably different resistance values of the at least two measuring resistor components cover a large range of values for the measuring range of the resistance value to be determined. Since the selection multiplexer circuit also has a not negligible resistance value, this would also have to be taken into account in a conventional determination of the resistance value of a sensor resistor component connected to the selected sensor resistor connection. Although there are selection multiplexer circuits with negligible resistance values that do not have to be taken into account, these selection multiplexer circuits are very expensive. According to the invention, this problem is now solved as follows: With the aid of at least one voltage measuring device, a first voltage between a pole of the selected measuring resistor component and a pole of a supply voltage source and a second voltage between a pole of the selected sensor resistor connection and a pole (can be the same or different) the supply voltage source measured. The resistance value of a sensor resistor component connected to the selected sensor resistor connection is determined by a computing unit from the supply voltage, the voltage at the selected measurement resistor component, the resistance value of the selected measurement resistor component and the voltage at the selected sensor resistor connection. The resistance value of the selection multiplexer circuit does not have to be taken into account according to the invention.
    [0006] The measuring circuit preferably has a plurality of sensor resistance connections. It is thus possible to connect several sensor resistor components to the measuring circuit and to easily determine the resistance values for several sensor resistor components with the aid of a single measuring circuit.
    [0007] The voltage measuring device preferably has a voltage measuring means and a voltage measuring multiplexer circuit. In this embodiment, both voltages are detected with a single voltage measuring device. The voltage measuring multiplexer circuit is set up in such a way that either the selected measuring resistance component or the selected sensor resistance connection is electrically connected to the voltage measuring means. In an alternative embodiment of the invention, the voltage measuring device can have two voltage measuring means in order to detect the two voltages individually and independently of one another. A first voltage measuring device is used to measure the voltage at the selected measuring resistor component and a second voltage measuring device is used to measure the voltage at the selected sensor resistor connection.
    CH 707 219 B1 [0008] In a particularly advantageous embodiment of the invention, the voltage measuring means is designed as an analog-to-digital converter. The analog-to-digital converter measures and digitizes the analog voltages and transmits the digitized analog voltages to the computing unit as a digital code. The analog-digital converter is expediently designed to be highly impedant, so that only a negligible measuring current flows. The analog-digital converter is expediently implemented as a sigma-delta converter. In a sigma-delta converter, the analog voltage to be digitized is first converted into a serial 1-bit data stream in the form of a square-wave signal with a very high sampling frequency. In this 1-bit data stream, noise effects arising from digitization can be reduced by means of a low-pass filter. The 1-bit data stream is then converted into a digital code made up of data words. The digitized analog voltage can be output by the sigma-delta converter, for example in 8-bit ASCII code. Reaching very high sampling frequencies in conventional analog-digital converters is associated with high costs. Sigma-delta converters have the advantage over conventional analog-to-digital converters that they can achieve high sampling frequencies at low cost. Sigma-delta converters achieve very high accuracies and high resolutions and reduce effectively occurring noise effects.
    Advantageously, the measuring circuit has one or more sensor resistor components, each of which is electrically connected to one of the one or more sensor resistor connections. In this way, all the necessary components for determining resistance values of one or more sensor resistor components are thus present in the measuring circuit itself, and the individual components can be controlled individually. It is therefore not necessary to exchange components for different measurements.
    [0010] In addition, the measuring circuit can preferably be designed as an integrated circuit. The complete measuring circuit for determining resistance values of one or more sensor resistor components can thus be implemented as a single component. The measuring circuit can thus be integrated in, for example, a control unit in a simple, flexible and cost-effective manner.
    The present invention is particularly suitable for being integrated in a motor vehicle control unit. In the automotive sector, control units have grown immensely in importance in recent decades. In today's motor vehicles, there can be several dozen control units that regulate the functions of the motor vehicle, from the engine control system to the air conditioning system and the entertainment system. Cost-effective production, space-saving design and simple handling are requirements that are placed on motor vehicle control units. The measuring circuit is ideally suited to these requirements in the automotive sector.
    Advantageously, the motor vehicle control unit is equipped with a control device which is set up to control the selection multiplexer circuit in such a way that a measuring resistor component and a sensor resistor connection are selected. With the help of the control device, resistance values of several sensor resistor components can thus be determined. The control device controls the individual components individually, individual components do not have to be replaced. This is particularly important during the operation of a motor vehicle.
    A computing unit according to the invention, e.g. A control unit of a motor vehicle is, in particular in terms of programming, set up to carry out a method according to the invention.
    The implementation of the method in the form of software is also advantageous, since this causes particularly low costs, in particular if an executing control device is still used for further tasks and is therefore present anyway. Suitable data carriers for providing the computer program are, in particular, floppy disks, hard disks, flash memory, EEPROMs, CD-ROMs, DVDs, etc. It is also possible to download a program via computer networks (internet, intranet, etc.).
    Further advantages and refinements of the invention result from the description and the accompanying drawing.
    It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination indicated in each case, but also in other combinations or on their own without departing from the scope of the present invention.
    The invention is illustrated schematically in the drawing using an exemplary embodiment and is described in detail below with reference to the drawing.
    Brief description of the drawings
    1 shows a schematic representation of a preferred embodiment of a measuring circuit according to the invention
    Embodiment (s) of the Invention In FIG. 1, a preferred embodiment of a measuring circuit according to the invention is shown purely schematically and designated by 1. The measuring circuit has a voltage supply terminal 20 which is connected to the positive pole 10 rsorgung a supply voltage source with the voltage value V Ve electrically connected.
    CH 707 219 B1 [0020] In the example shown, three measuring resistor components 100 with different resistance values are available. The measuring resistor components 100 are electrically connected to the supply voltage source. A sensor resistor component 250 is electrically connected or can be connected to three sensor resistor connections 200. Sensor resistor devices 250 are connected to ground. The resistance values of the measuring resistance components 100 are expediently chosen such that one of the measuring resistance components 100 has a comparatively small resistance value. A second one of the measuring resistor components 100 has a comparatively high resistance value. The resistance value of the third of the measuring resistor components 100 lies between the resistance values of the other two measuring resistor components. The resistance values of the three measuring resistor components 100 thus cover a large value range, with which a large value range of the resistance values of the sensor resistor components 250 can be covered. Thus, three measuring resistor components 100 available for selection ensure that one of the measuring resistor components 100 available for selection always has a resistance value that is in the order of magnitude of the resistance value to be determined for the selected sensor resistor component 250.
    A selection multiplexer circuit 300 electrically connects one of the measuring resistor components 100 to one of the sensor resistor connections 200 in series. Thus, the selected measuring resistor component 100, the selected sensor resistor component 250 electrically connected to the selected sensor resistor terminal 200 and the selection multiplexer circuit 300 form a series connection between the positive pole 10 of the supply voltage source and ground.
    The resistance value Rsensor of the selected sensor resistor component 250 is now determined with the help of the selected measuring resistor component 100, which has a resistance value RMess. The resistance value of the selection multiplexer circuit 300, RMuitipiex, is advantageously not taken into account here.
    To this end, two voltages are measured with the aid of a voltage measuring device 400. The voltage measuring device 400 has two voltage measuring means. A first voltage measuring means 410, which is designed as an analog-to-digital converter, is connected to the positive pole of the supply voltage source 10 on the one hand and to ground on the other hand for power supply. The first voltage measuring means 410 measures the voltage between a pole 150 of the selected measuring resistor component 100 and ground. The poles 150 of the measuring resistor components 100 lie between the measuring resistor components 100 and the selection multiplexer circuit 300. This results in a voltage value V MeS s for the voltage between the pole 150 of the selected measuring resistor component 200 and ground.
    A second voltage measuring means 420, which is also designed as an analog-to-digital converter, is also connected to the positive pole 10 of the supply voltage source and ground for power supply. The second voltage measuring means 420 measures the voltage between the selected sensor resistance connection 200 and ground. This results in a voltage value V for Se nsor the voltage between the selected sensor resistor terminal 200 and ground.
    The analog-digital converter 410 and 420 digitize the measured analog voltages and transmit the digitized voltages as a digital code to a computing unit 500. The computing unit 500 calculates the resistance value R s of the sensor resistor component 250 connected to the selected sensor resistor connection 200 according to the formula :
    v
    Supply 'supply from the supply voltage, V Ve rsorgung, the resistance value of the selected measurement resistor device 100, Rmeas, the voltage at the selected measurement resistor element 100, V MeS s, and the voltage at the selected sensor resistor terminal 200, V sen sor · The resistance value of the selection Multiplexer circuit 300, V Mu itipiex, is not important.
    权利要求:
    Claims (10)
    [1]
    claims
    1. Measuring circuit (1) for determining a resistance value of a sensor resistor component (250), with a voltage supply connection (20), which is set up to be electrically connected to a pole (10) of a supply voltage source with two poles, at least two measuring resistor components (100) preferably having different resistance values, one or more sensor resistor connections (200), each of which is set up to be electrically connected to a sensor resistor component (250), a selection multiplexer circuit (300) which is set up to select one of the at least two measuring resistor components (100) electrically connected in series with a selected one of the one or more sensor resistor connections (200), at least one voltage measuring device (400), which is configured to detect a voltage between one pole of the selected measuring resistor component (100) and one pole of the two Pole (10) the supply voltage 4
    CH 707 219 B1 source and a voltage between a pole of the selected sensor resistor connection (200) and one of the two poles (10) of the supply voltage source, and a computing unit (500), which is set up to determine the resistance value of one at the selected sensor resistor connection ( 200) connected sensor resistor component (250) from the supply voltage, the resistance value of the selected measuring resistor component (100), the voltage at the selected measuring resistor component (100) and the voltage at the selected sensor resistor connection (200).
    [2]
    2. Measuring circuit according to claim 1, with a plurality of sensor resistor connections (200).
    [3]
    3. Measuring circuit according to claim 1 or 2, wherein the voltage measuring device (400) comprises a voltage measuring means and a voltage measuring multiplexer circuit, which is set up to selectively electrically connect the selected measuring resistance component (100) or the selected sensor resistance connection (200) to the voltage measuring means.
    [4]
    4. Measuring circuit according to claim 1 or 2, wherein the voltage measuring device (400) comprises a first voltage measuring means (410) for measuring the voltage at the selected measuring resistor component and a second voltage measuring means (420) for measuring the voltage at the selected sensor resistor connection.
    [5]
    5. Measuring circuit according to claim 3 or 4, wherein the voltage measuring means is designed as an analog-to-digital converter, in particular as a sigma-delta converter.
    [6]
    6. Measuring circuit according to one of the preceding claims, further comprising one or more sensor resistor components (250), each of which is electrically connected to one of the one or more sensor resistor connections (200).
    [7]
    7. Measuring circuit according to one of the preceding claims, which is designed as an integrated circuit.
    [8]
    8. Motor vehicle control device with a measuring circuit according to one of claims 1 to 7.
    [9]
    9. Motor vehicle control device according to claim 8 with a control device which is set up to control the selection multiplexer circuit (300) such that a measuring resistor component (100) and a sensor resistor connection (200) are selected.
    [10]
    10. A method for determining a resistance value of a sensor resistor component (250) by means of the circuit according to one of claims 1 to 7, wherein a voltage drop at the sensor resistor component (250) and a voltage drop at the measuring resistor component (100) are determined, the measuring resistor component (100) is selected from at least two measuring resistor components with different resistance values, and the resistance value of the sensor resistor element (250) is determined from the supply voltage, the voltage drop across the sensor resistor element (250), the voltage drop across the measuring resistor element (100) and the resistance value of the measuring resistor element (100).
    CH 707 219 B1
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE201210220738|DE102012220738A1|2012-11-14|2012-11-14|Measuring circuit for determining resistance value of sensor resistor element for motor vehicle control device, has power supply terminal, which is electrically connected with pole of supply voltage source|
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