Plural-frequency capacitive occupancy sensing system
    1.
    发明授权
    Plural-frequency capacitive occupancy sensing system 有权
    多频电容占用传感系统

    公开(公告)号:US08994385B2

    公开(公告)日:2015-03-31

    申请号:US13554242

    申请日:2012-07-20

    摘要: A plural-frequency capacitive occupancy sensing system comprises an antenna electrode and a detection circuit, which is configured to drive the antenna electrode at least with a first and a second signal at a first and a second frequency, respectively, so as to obtain at least a first and a second measurement value indicative of at least one of conductance, susceptance, resistance, reactance and capacitance between the antenna electrode and a reference node, at the first frequency and the second frequency, respectively. The detection circuit compares the capacitance between the antenna electrode and the reference node with a threshold capacitance, the threshold capacitance being derived from a difference between the first and second measurement values and/or the capacitance between the antenna electrode and the reference node being corrected based upon the difference between the measurement values. The detection circuit outputs an occupancy state signal depending on the comparison.

    摘要翻译: 多频电容占用感测系统包括天线电极和检测电路,其被配置为分别至少以第一和第二频率的第一和第二信号驱动天线电极,以至少获得 第一和第二测量值分别表示第一频率和第二频率处的天线电极和参考节点之间的电导,电纳,电阻,电抗和电容中的至少一个。 检测电路将天线电极和参考节点之间的电容与阈值电容进行比较,阈值电容由第一和第二测量值之间的差导出,和/或天线电极与参考节点之间的电容被校正为基础 根据测量值之间的差异。 检测电路根据比较输出占空状态信号。

    Capacitive occupant detection system with interference detection
    3.
    发明授权
    Capacitive occupant detection system with interference detection 有权
    具有干扰检测能力的乘员检测系统

    公开(公告)号:US08698511B2

    公开(公告)日:2014-04-15

    申请号:US13576190

    申请日:2011-01-26

    IPC分类号: G01R27/26

    CPC分类号: B60N2/002 B60R21/01532

    摘要: A capacitive occupant detection system (10) comprises a sine signal generator (12) to apply a sine voltage signal to an antenna electrode (14) and a current measurement circuit (18, 20, 28, 30, 40) to measure current signals, based upon which a control and evaluation unit determines and outputs an occupancy state. The signal generator (12) is coupled to the antenna electrode via an amplitude adjustment stage (13), configured to adjust the amplitude of said sine voltage signal applied to said antenna electrode to an amplitude selected among at least two discrete amplitudes. The control and evaluation circuit selects one of the discrete amplitudes at a time and causes the amplitude adjustment stage to adjust the amplitude of said the voltage signal applied to the antenna electrode accordingly. The control and evaluation circuit carries out an interference detection mode and an occupant detection mode. In interference detection mode, the current signals are measured while a low one of the at least two discrete amplitudes is selected and it is determined whether the antenna electrode is exposed to interference. In occupant detection mode, the current signals are measured while a high one of the at least two discrete amplitudes is selected and occupancy state is determined based upon the current signals thus measured.

    摘要翻译: 电容乘员检测系统(10)包括正弦信号发生器(12),用于向天线电极(14)和电流测量电路(18,20,28,30,40)施加正弦电压信号以测量电流信号, 基于该控制和评估单元确定并输出占用状态。 信号发生器(12)经由幅度调节级(13)耦合到天线电极,该幅度调节级被配置为将施加到所述天线电极的所述正弦电压信号的振幅调整到从至少两个离散振幅中选择的振幅。 控制和评估电路一次选择一个离散振幅,并使幅度调整级相应地调节施加到天线电极的所述电压信号的幅度。 控制和评估电路执行干扰检测模式和乘员检测模式。 在干扰检测模式中,在选择了至少两个离散振幅中的较低的一个时测量电流信号,并且确定天线电极是否暴露于干扰。 在乘员检测模式中,在选择至少两个离散振幅中的高一个时,测量电流信号,并且基于如此测量的电流信号来确定占用状态。

    Capacitive occupant detection system with interference detection
    4.
    发明申请
    Capacitive occupant detection system with interference detection 有权
    具有干扰检测能力的乘员检测系统

    公开(公告)号:US20130015866A1

    公开(公告)日:2013-01-17

    申请号:US13576190

    申请日:2011-01-26

    IPC分类号: G01R27/26

    CPC分类号: B60N2/002 B60R21/01532

    摘要: A capacitive occupant detection system (10) comprises a sine signal generator (12) to apply a sine voltage signal to an antenna electrode (14) and a current measurement circuit (18, 20, 28, 30, 40) to measure current signals, based upon which a control and evaluation unit determines and outputs an occupancy state. The signal generator (12) is coupled to the antenna electrode via an amplitude adjustment stage (13), configured to adjust the amplitude of said sine voltage signal applied to said antenna electrode to an amplitude selected among at least two discrete amplitudes. The control and evaluation circuit selects one of the discrete amplitudes at a time and causes the amplitude adjustment stage to adjust the amplitude of said the voltage signal applied to the antenna electrode accordingly. The control and evaluation circuit carries out an interference detection mode and an occupant detection mode. In interference detection mode, the current signals are measured while a low one of the at least two discrete amplitudes is selected and it is determined whether the antenna electrode is exposed to interference. In occupant detection mode, the current signals are measured while a high one of the at least two discrete amplitudes is selected and occupancy state is determined based upon the current signals thus measured.

    摘要翻译: 电容乘员检测系统(10)包括正弦信号发生器(12),用于向天线电极(14)和电流测量电路(18,20,28,30,40)施加正弦电压信号以测量电流信号, 基于该控制和评估单元确定并输出占用状态。 信号发生器(12)经由幅度调节级(13)耦合到天线电极,该幅度调节级被配置为将施加到所述天线电极的所述正弦电压信号的振幅调整到从至少两个离散振幅中选择的振幅。 控制和评估电路一次选择一个离散振幅,并使幅度调整级相应地调节施加到天线电极的所述电压信号的幅度。 控制和评估电路执行干扰检测模式和乘员检测模式。 在干扰检测模式中,在选择了至少两个离散振幅中的较低的一个时测量电流信号,并且确定天线电极是否暴露于干扰。 在乘员检测模式中,在选择至少两个离散振幅中的高一个时,测量电流信号,并且基于如此测量的电流信号来确定占用状态。