公开(公告)号：EP1820031A1

公开(公告)日：2007-08-22

申请号：EP05811925.6

申请日：2005-10-25

申请人： Freescale Semiconductor, Inc.

发明人： CLIFFORD, Michelle A. ,  BORRAS, Rodrigo L. ,  GOMEZ, Leticia ,  UEDA, Akihiro

IPC分类号： G01P15/00

CPC分类号： G11B19/04 ,  G01P15/0891 ,  G01P15/18

摘要： A system and method is provided for electronic device fall detection. The system and method provides the ability to reliably detect falls even in the presence of other motion in the electronic device. The fall detection system includes a plurality of accelerometers (102) and a processor (104). The plurality of accelerometers (102) provides acceleration measurements to the processor (104), these measurements describing the current acceleration of the electronic device in all directions. The processor (104) receives the acceleration measurements and compares the acceleration measurements to a value range to determine if the device is currently falling. Furthermore, the system and method can reliably detect a non-linear fall, such as when the fall is accompanied with device rotation or initiated by additional external force. To detect a non-linear fall, the processor (104) compares combinations of acceleration measurements to a value range and further determines the smoothness of the acceleration measurement combinations.

公开(公告)号：EP1820031B1

公开(公告)日：2012-05-16

申请号：EP05811925.6

申请日：2005-10-25

申请人： Freescale Semiconductor, Inc.

发明人： CLIFFORD, Michelle A. ,  BORRAS, Rodrigo L. ,  GOMEZ, Leticia ,  UEDA, Akihiro

IPC分类号： G01P15/08 ,  G01P15/18

CPC分类号： G11B19/04 ,  G01P15/0891 ,  G01P15/18

摘要： A system and method is provided for electronic device fall detection. The system and method provides the ability to reliably detect falls even in the presence of other motion in the electronic device. The fall detection system includes a plurality of accelerometers (102) and a processor (104). The plurality of accelerometers (102) provides acceleration measurements to the processor (104), these measurements describing the current acceleration of the electronic device in all directions. The processor (104) receives the acceleration measurements and compares the acceleration measurements to a value range to determine if the device is currently falling. Furthermore, the system and method can reliably detect a non-linear fall, such as when the fall is accompanied with device rotation or initiated by additional external force. To detect a non-linear fall, the processor (104) compares combinations of acceleration measurements to a value range and further determines the smoothness of the acceleration measurement combinations.

公开(公告)号：EP2074434A2

公开(公告)日：2009-07-01

申请号：EP07814883.0

申请日：2007-09-17

申请人： Freescale Semiconductor, Inc.

发明人： UEDA, Akihiro ,  MCNEIL, Andrew C.

IPC分类号： G01P15/125

CPC分类号： G01P21/00 ,  G01P15/0891 ,  G01P15/125 ,  G01P15/18 ,  G01P2015/082 ,  G01P2015/0831 ,  G11B19/043

摘要： A transducer (20) includes a movable element (24), a self-test actuator (22), and a sensing element (56, 58). The sensing element (56, 58) detects movement of the movable element (24) from a first position (96) to a second position (102) along an axis perpendicular to a plane of the sensing element (56, 58). The second position (102) results in an output signal (82) that simulates a free fall condition. A method (92) for testing a protection feature of a device (70) having the transducer (20) entails moving the movable element (24) to the first position (102) to produce a negative gravitational force detectable at the sensing element (56, 68), applying a signal (88) to the actuator (22) to move the movable element (24) to the second position (102) by the electrostatic force (100) , and ascertaining an enablement of the protection feature in response to the simulated free fall.

摘要翻译： 传感器（20）包括可移动元件（24），自检致动器（22）和感测元件（56,58）。 感测元件（56,58）沿着垂直于感测元件（56,58）的平面的轴线检测可动元件（24）从第一位置（96）到第二位置（102）的运动。 第二位置（102）产生模拟自由落体状态的输出信号（82）。 用于测试具有换能器（20）的装置（70）的保护特征的方法（92）需要将可移动元件（24）移动到第一位置（102）以产生在感测元件（56）处可检测到的负重力 ，68），通过静电力（100）将信号（88）施加到致动器（22）以将可移动元件（24）移动到第二位置（102），并且确定响应于 模拟自由落体。