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Calculating a temperature dependent resistance in terms of a known resistance and a duty cycle of a pulse width modulated signal

A resistive element, a technique for measuring resistance, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, thermometers with electrical/magnetic elements that are directly sensitive to heat, etc.

Inactive Publication Date: 2012-07-25
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] On the other hand, PTC thermistors allow more accurate measurements at low temperatures, but are more expensive than NTC thermistors

Method used

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  • Calculating a temperature dependent resistance in terms of a known resistance and a duty cycle of a pulse width modulated signal
  • Calculating a temperature dependent resistance in terms of a known resistance and a duty cycle of a pulse width modulated signal
  • Calculating a temperature dependent resistance in terms of a known resistance and a duty cycle of a pulse width modulated signal

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no. 1 example

[0081] figure 1 A first embodiment of the invention is shown, which includes a method for measuring the resistance value R of the resistive element 2 TH Circuit 1.

[0082] Resistive element 2 is connected in series to have a known resistance value R PU The pull-up resistor 3 to form a voltage divider 4.

[0083] In order to achieve this purpose, the first voltage value V P Provided to the free terminal 3' of the pull-up resistor 3, and the lower second voltage value V N Provided to the free end 2 ′ of the resistive element 2 .

[0084] At the common node 5 of the resistive element 2 and the pull-up resistor 3, the voltage divider 4 produces a voltage signal V that can be calculated according to the following formula S :

[0085] V S = V P · R TH + V ...

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Abstract

A method is provided for measuring a resistance value of a resistive component, which provides for connecting a pull up resistance, in series to the component and supplying a first voltage value to a free end of the pull up resistance and a second lower voltage value to a free end of the component, monitoring a signal indicative of a voltage value between the component and the pull up resistance, determining the difference between the monitored signal and a generated PWM signal having a high voltage value and low voltage value, integrating the difference, obtaining an output signal, varying a duty cycle of the PWM signal based on the variation over time of the output signal, acquiring a duty cycle of the PWM signal, and determining the resistance value of the resistive component based on the duty cycle value and of the pull up resistance value.

Description

technical field [0001] The invention relates to a circuit for measuring the resistance of a resistive element, such as a PTC or NTC thermistor sensor for monitoring temperature values ​​in a vehicle system. Background technique [0002] It is known that modern vehicle systems are traditionally equipped with a plurality of resistive sensors for monitoring the temperature values ​​of various components in the vehicle system. [0003] Currently, commonly used resistance temperature sensors are negative temperature coefficient thermistors (NTC) or positive temperature coefficient thermistors (PTC). [0004] The measurement of the temperature value typically uses a voltage divider present in a pull-up resistor, having a known resistance value, connected in series at a common node to the resistive sensor. Two different voltage values ​​are respectively supplied to the free ends of the voltage divider to generate an analog signal representing the resistance of the resistive sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCG01K7/24G01R15/04G01R27/02
Inventor S.尼杜F.奥蒂里
Owner GM GLOBAL TECH OPERATIONS LLC