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1. 发明授权

US06427349B1 Compensation system for electronic compass 失效
标题翻译：电子罗盘补偿系统
公开(公告)号：US06427349B1
公开(公告)日：2002-08-06
申请号：US09758518
申请日：2001-01-11
申请人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
发明人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
IPC分类号： G01C1728
CPC分类号： B60R1/12 , B60K35/00 , B60R1/088 , B60R1/1207 , B60R2001/1215 , B60R2001/1223 , B60R2001/123 , B60R2001/1246 , B60R2001/1253 , B60R2001/1284 , G01C17/28 , G01C17/38 , G01R33/025
摘要： An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal compensation mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined. The system automatically exits the initial calibration mode when certain criteria have been met. In the normal compensation mode, the signal reference value for each axis is adjusted at least once during the time interval between turn-on and turn-off of the vehicle ignition switch.
摘要翻译：电子罗盘描述为用于车辆。罗盘使用磁阻传感器来感测地球磁场，传感器以交替设置/复位偏置模式运行。在第一实施例中，通过包括测量传感器输出信号的闭环系统和用于使车辆偏离场无效的偏移电流带来向罗盘提供偏差补偿。在第二实施例中，通过在初始校准模式中的操作和通常在正常补偿模式下操作来提供偏差补偿，以在罗盘的正常操作期间根据需要在长期基础上调整补偿。在初始校准模式下，当车辆被驱动时，通过改变偏移电流将信号峰值调整到标称接地电平。然后，确定每个轴的补偿信号参考值，作为该轴的每个峰值被确定。当符合某些标准时，系统会自动退出初始校准模式。在正常补偿模式下，每个轴的信号参考值在车辆点火开关的开启和关闭之间的时间间隔内至少调整一次。

2. 发明授权

US5632092A Compensation system for electronic compass 失效
标题翻译：电子罗盘补偿系统
公开(公告)号：US5632092A
公开(公告)日：1997-05-27
申请号：US457621
申请日：1995-06-01
申请人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
发明人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
IPC分类号： G01C17/32 , B60K35/00 , B60R1/08 , B60R1/12 , G01C17/28 , G01C17/38 , G01R33/025 , G01R33/06
CPC分类号： B60R1/12 , B60K35/00 , B60R1/088 , G01C17/28 , G01C17/38 , G01R33/025 , B60R1/1207 , B60R2001/1215 , B60R2001/1223 , B60R2001/123 , B60R2001/1246 , B60R2001/1253 , B60R2001/1284
摘要： An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined. The system automatically exits the initial calibration mode when certain criteria have been met. In the normal compensation mode, The signal reference value for each axis is adjusted at least once during the time interval between turn-on and turn-off of the vehicle ignition switch.
摘要翻译：电子罗盘描述为用于车辆。罗盘使用磁阻传感器来感测地球磁场，传感器以交替设置/复位偏置模式运行。在第一实施例中，通过包括测量传感器输出信号的闭环系统和用于使车辆偏离场无效的偏移电流带来向罗盘提供偏差补偿。在第二实施例中，通过在初始校准模式中的操作以及在正常校准模式下操作来提供偏差补偿，以根据需要在罗盘的正常操作期间长期地调整补偿。在初始校准模式下，当车辆被驱动时，通过改变偏移电流将信号峰值调整到标称接地电平。然后，确定每个轴的补偿信号参考值，作为该轴的每个峰值被确定。当符合某些标准时，系统会自动退出初始校准模式。在正常补偿模式下，每个轴的信号参考值在车辆点火开关的开启和关闭之间的时间间隔内至少调整一次。

3. 发明授权

US5644851A Compensation system for electronic compass 失效
标题翻译：电子罗盘补偿系统
公开(公告)号：US5644851A
公开(公告)日：1997-07-08
申请号：US142509
申请日：1993-10-25
申请人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
发明人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
IPC分类号： G01C17/32 , B60K35/00 , B60R1/08 , B60R1/12 , G01C17/28 , G01C17/38 , G01R33/025
CPC分类号： B60R1/12 , B60K35/00 , B60R1/088 , G01C17/28 , G01C17/38 , G01R33/025 , B60R1/1207 , B60R2001/1215 , B60R2001/1223 , B60R2001/123 , B60R2001/1246 , B60R2001/1253 , B60R2001/1284
摘要： An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined. The system automatically exits the initial calibration mode when certain criteria have been met. In the normal compensation mode, the signal reference value for each axis is adjusted at least once during the time interval between turn-on and turn-off of the vehicle ignition switch.
摘要翻译：电子罗盘描述为用于车辆。罗盘使用磁阻传感器来感测地球磁场，传感器以交替设置/复位偏置模式运行。在第一实施例中，通过包括测量传感器输出信号的闭环系统和用于使车辆偏离场无效的偏移电流带来向罗盘提供偏差补偿。在第二实施例中，通过在初始校准模式中的操作以及在正常校准模式下操作来提供偏差补偿，以根据需要在罗盘的正常操作期间长期地调整补偿。在初始校准模式下，当车辆被驱动时，通过改变偏移电流将信号峰值调整到标称接地电平。然后，确定每个轴的补偿信号参考值，作为该轴的每个峰值被确定。当符合某些标准时，系统会自动退出初始校准模式。在正常补偿模式下，每个轴的信号参考值在车辆点火开关的开启和关闭之间的时间间隔内至少调整一次。

4. 发明授权

US06173501B1 Compensation system for electronic compass 失效
标题翻译：电子罗盘补偿系统
公开(公告)号：US06173501B1
公开(公告)日：2001-01-16
申请号：US09149227
申请日：1998-09-08
申请人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
发明人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
IPC分类号： G01C1728
CPC分类号： B60R1/12 , B60K35/00 , B60R1/088 , B60R1/1207 , B60R2001/1215 , B60R2001/1223 , B60R2001/123 , B60R2001/1246 , B60R2001/1253 , B60R2001/1284 , G01C17/28 , G01C17/38 , G01R33/025
摘要： An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal compensation mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined. The system automatically exits the initial calibration mode when certain criteria have been met. In the normal compensation mode, the signal reference value for each axis is adjusted at least once during the time interval between turn-on and turn-off of the vehicle ignition switch.
摘要翻译：电子罗盘描述为用于车辆。罗盘使用磁阻传感器来感测地球磁场，传感器以交替设置/复位偏置模式运行。在第一实施例中，通过包括测量传感器输出信号的闭环系统和用于使车辆偏离场无效的偏移电流带来向罗盘提供偏差补偿。在第二实施例中，通过在初始校准模式中的操作和通常在正常补偿模式下操作来提供偏差补偿，以在罗盘的正常操作期间根据需要在长期基础上调整补偿。在初始校准模式下，当车辆被驱动时，通过改变偏移电流将信号峰值调整到标称接地电平。然后，确定每个轴的补偿信号参考值，作为该轴的每个峰值被确定。当符合某些标准时，系统会自动退出初始校准模式。在正常补偿模式下，每个轴的信号参考值在车辆点火开关的开启和关闭之间的时间间隔内至少调整一次。

5. 发明授权

US5802727A Compensation system for electronic compass 失效
标题翻译：电子罗盘补偿系统
公开(公告)号：US5802727A
公开(公告)日：1998-09-08
申请号：US823469
申请日：1997-03-24
申请人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
发明人： Rodney K. Blank , Richard J. Gahan , Howard J. Haselhuhn, Jr. , Kenneth L. Schierbeek , Kenneth Schofield
IPC分类号： G01C17/32 , B60K35/00 , B60R1/08 , B60R1/12 , G01C17/28 , G01C17/38 , G01R33/025
CPC分类号： B60R1/12 , B60K35/00 , B60R1/088 , G01C17/28 , G01C17/38 , G01R33/025 , B60R1/1207 , B60R2001/1215 , B60R2001/1223 , B60R2001/123 , B60R2001/1246 , B60R2001/1253 , B60R2001/1284
摘要： An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined. The system automatically exits the initial calibration mode when certain criteria have been met. In the normal compensation mode, The signal reference value for each axis is adjusted at least once during the time interval between turn-on and turn-off of the vehicle ignition switch.
摘要翻译：电子罗盘描述为用于车辆。罗盘使用磁阻传感器来感测地球磁场，传感器以交替设置/复位偏置模式运行。在第一实施例中，通过包括测量传感器输出信号的闭环系统和用于使车辆偏离场无效的偏移电流带来向罗盘提供偏差补偿。在第二实施例中，通过在初始校准模式中的操作以及在正常校准模式下操作来提供偏差补偿，以根据需要在罗盘的正常操作期间长期地调整补偿。在初始校准模式下，当车辆被驱动时，通过改变偏移电流将信号峰值调整到标称接地电平。然后，确定每个轴的补偿信号参考值，作为该轴的每个峰值被确定。当符合某些标准时，系统会自动退出初始校准模式。在正常补偿模式下，每个轴的信号参考值在车辆点火开关的开启和关闭之间的时间间隔内至少调整一次。

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