发明公开
EP1653206A3 Shielded capacitive load cell apparatus responsive to weight applied to a vehicle seat
审中-公开
基本信息:
- 专利标题： Shielded capacitive load cell apparatus responsive to weight applied to a vehicle seat
- 专利标题（中）：屏蔽电容性负载电池设备，其中反应以重量被施加到车辆座椅
- 申请号：EP05077275.5 申请日：2005-10-06
- 公开(公告)号：EP1653206A3 公开(公告)日：2006-07-26
- 发明人： Cobb, Gregory A. , Fortune, Duane D. , Fultz, William W. , Griffin, Dennis P.
- 申请人： Delphi Technologies, Inc.
- 申请人地址： PO Box 5052 Troy, MI 48007 US
- 专利权人： Delphi Technologies, Inc.
- 当前专利权人： Delphi Technologies, Inc.
- 当前专利权人地址： PO Box 5052 Troy, MI 48007 US
- 代理机构： Denton, Michael John
- 优先权： US978260 20041030
- 主分类号： G01L1/14
- IPC分类号： G01L1/14
摘要：
The capacitance of a shielded capacitive load cell (12, 32) is determined so as to minimize the effect of stray or parasitic capacitance between the load cell (12) and other objects including the shield (32). The load cell conductors are coupled across input and output terminals of an operational amplifier (46) that is tied to a reference voltage. A constant current is applied to the load cell (12), and the resulting rate of change in voltage at the amplifier output is measured as a representation of the load cell capacitance. In a vehicle seat sensor application including an electromagnetic interference shield (32) between the load cell (12) and the seating surface (18), the amplifier output is coupled to the load cell electrode furthest from the shield (32), the amplifier (46) maintains the other load cell electrode at a virtual reference voltage, and the shield (32) is tied to the reference voltage.
公开/授权文献:
IPC结构图谱:
| G | 物理 |
| --G01 | 测量；测试 |
| ----G01L | 测量力、应力、转矩、功、机械功率、机械效率或流体压力 |
| ------G01L1/00 | 力或应力的一般计量 |
| --------G01L1/14 | .通过测量电元件的电容量或电感量的变化，例如，测量电振荡器的频率变化 |