发明名称 |
METHOD AND DEVICE FOR DETECTING STEERING WHEEL CONTACT |
摘要 |
A device for detecting steering wheel contact comprises at least a first electrode (12) which is provided in a steering wheel (10) and which forms, together with a human body acting as a second electrode and a dielectric situated therebetween, at least one sensor capacitor (26). The device also comprises an evaluation circuit (24) having a reference capacitor (30) of known capacitance which can be connected parallel to the sensor capacitor (26), a direct current voltage source (34) which can be connected to the reference capacitor (30), and a measuring device for measuring the voltage at the reference capacitor (30). A method for detecting steering wheel contact using such a device comprises the following successive steps: charging the reference capacitor (30) by applying a known reference voltage, or charging the reference capacitor (30) and subsequently measuring a first voltage at the reference capacitor (30); connecting, in parallel, the sensor capacitor (26) to the reference capacitor (30) so that a portion of the charge of the reference capacitor (30) is transmitted to the sensor capacitor (26); measuring a second voltage at the reference capacitor (30); and determining the capacitance of the sensor capacitor (26) from the known capacitance of the reference capacitor (30), the reference voltage or the first voltage and the second voltage. |
申请公布号 |
WO2016071002(A3) |
申请公布日期 |
2016.06.30 |
申请号 |
WO2015EP02240 |
申请日期 |
2015.11.09 |
申请人 |
TRW AUTOMOTIVE SAFETY SYSTEMS GMBH |
发明人 |
BOSSLER, HANS-JÜRGEN;KREUZER, MARTIN;HIRZMANN, GUIDO;LAMMERS, ALEXANDER;HEIST, HELGA |
分类号 |
H03K17/96;B62D1/04;B62D1/06;H03K17/955 |
主分类号 |
H03K17/96 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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