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Device for measuring a capacitance variation in a variable capacity structure

A variable capacitance and capacitive technology, which is applied in the direction of transmitting sensing components, electronic switches, electrical components, etc. by using electric/magnetic devices, can solve problems such as detection being delayed for too long and sensor accuracy decreasing

Active Publication Date: 2013-01-16
VITESCO TECH FRANCE SAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0031] However, as explained above, this may cause the detection to be delayed for too long considering that reducing the measurement time causes a decrease in the accuracy of the sensor

Method used

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  • Device for measuring a capacitance variation in a variable capacity structure
  • Device for measuring a capacitance variation in a variable capacity structure
  • Device for measuring a capacitance variation in a variable capacity structure

Examples

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Embodiment Construction

[0061] As shown in FIG. 2, the charge transfer capacitive sensor 3 incorporated into the vehicle door handle 6 includes a capacitor C x The changed electrode 4 and the reference capacitance C located on the printed circuit board 5 S , The latter is also incorporated into the handle 6. When the driver's hand approaches the door handle 6 from the far position 1 to the near position 2 (Figure 2), the capacitance of the electrode C X Increased amount ΔC X , Using the reference capacitor C located on the printed circuit board 5 connected to the electrode 4 S To measure this change ΔC X . If this capacitance exceeds the threshold, it means that the driver's hand is located at position 2 near the handle of the door, and the driver wants to open the door.

[0062] The prior art (shown in FIG. 1) describes a capacitive sensor that measures the change in capacitance of a variable capacitance, and is implemented by making the capacitance C of the electrode X Charge and discharge to reference...

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Abstract

The invention relates to a device for measuring the change in capacitance (ΔCX) of a variable capacitive structure (CX), comprising: a supply voltage (VCC); a reference capacitance (CS); terminals for measuring the reference capacitance means for measuring the voltage on the capacitor (VS); ● means for measuring the capacitive structure (CM); and ● means for detecting the threshold voltage (VTH) on the terminals of the reference capacitance (CS). The device is configured / programmed such that: after the variable capacitive structure (CX) has been discharged into the reference capacitor (CS) for a fixed number of discharges (x) and until the voltage on the terminals of the reference capacitor (VS) has Reaching the threshold voltage (VTH) discharges the measuring capacitive structure (CM) to the reference capacitor (CS) with a variable number of discharges (n). The variation of the variable number of discharges (n) relative to the number of discharges obtained before allows the change in capacitance (ΔCX) of the variable capacitive structure (CX) to be estimated.

Description

Technical field [0001] The present invention relates to a charge transfer capacitive sensor. The present invention is particularly useful when such a sensor is applied to the door handle of the vehicle for so-called "Hands free" access by the driver to his vehicle. Background technique [0002] Currently, certain motor vehicles are equipped with "hands-free" access, that is, the driver of the vehicle no longer needs to use a key to open the door of his vehicle. What he has is not a key but a badge d’identification that is recognized by the vehicle’s electronic system. [0003] To open the door, the driver first presses the door handle. The presence or absence of a detection sensor (capteur de présence) (here, a charge transfer capacitive sensor in an electronic module located in the handle) detects the presence of the driver's hand. This sensor is connected to the ECU (Electronic Control Unit) of the vehicle, and this unit sends a signal to the discriminator incorporated in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/24
CPCG01D5/24H03K17/962H03K2217/960725
Inventor X·乌尔内
Owner VITESCO TECH FRANCE SAS
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