Data processing: generic control systems or specific application – Generic control system – apparatus or process – Having specific algorithm
Reexamination Certificate
1998-11-06
2001-11-06
Grant, William (Department: 2121)
Data processing: generic control systems or specific application
Generic control system, apparatus or process
Having specific algorithm
C700S067000, C700S068000, C700S069000, C700S074000, C701S005000, C701S037000, C701S038000, C701S070000, C702S085000, C702S104000
Reexamination Certificate
active
06314329
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to solid state sensors as used in motor vehicle control and more particularly a method for fingerprinting a yaw rate sensor according to environmental conditions.
2. Prior Art
U.S. Pat. No. 5,809,434 entitled Method and Apparatus for Dynamically Determining an Operating State of a Motor Vehicle issued Sep. 15, 1998 by Ashrafi et al. and assigned to a common assignee, relates to a method for determining the D.C. offset or sensor drift of a yaw rate of a motor vehicle when the vehicle is moving.
U.S. Pat. No. 5,742,918 entitled Method and Apparatus for Dynamically Compensating a Lateral Acceleration of a Motor Vehicle issued Apr. 21, 1998 by Ashrafi et al. and assigned to a common assignee, relates to a method for determining the D.C. offset or sensor drift of lateral acceleration of a motor vehicle.
U.S. Pat. No. 5,742,919 entitled Method and Apparatus for Dynamically Determining a Lateral Velocity of a Motor Vehicle issued Apr. 21, 1998 by Ashrafi et al. and assigned to a common assignee, relates to a method for dynamically estimating a lateral velocity of a motor vehicle.
All of the above patents are incorporated herein by reference as they all relate to motor vehicle control systems wherein sensors, as described herein, are used.
SUMMARY OF THE INVENTION
There is described and disclosed a method and algorithm for determining the offset value of an electronic sensor such as used in a motor vehicle control system while the vehicle is moving. The method has the steps of initially storing in a memory default maximum and minimum offset values of the sensor as determined at time of manufacture. The electronic control unit calculates the average of the two stored values to derive an offset value for the sensor representing the predetermined known beginning zero offset point of the sensor.
The ignition is turned on and the vehicle is not moving, an initializing signal, applying power to the sensor. After a predetermined time period, &Dgr;T, after the power is applied, the sensor output is measured to establish a reference level of the sensor. The measured value is then compared with both the stored maximum and minimum offset values of the sensor. If there is a difference, the difference is determined and if the measured value is greater (in a positive sense) or less than (in a negative sense) one of the stored values, the stored value is replaced. The electronic control unit then recalculates the average of the two stored values to derive a new offset value for the sensor.
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Ashrafi Behrouz
Madau Dinu Petre
Grant William
Kajander John E.
Patel Ramesh
Visteon Global Technologies Inc.
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