Arrangement for angle measurements
AssigneeKoninklijke Philips Electronics N.V.
InventorKlaus Dietmayer
Life of this patent
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Abstract
Angle measurement is accomplished through an angle sensor (1) supplying two sensor signals which are phase-shifted by 90 degrees relative to each other and whose amplitudes are dependent on the temperature, determined by a temperature sensor (7) and fed to a microprocessor (6). The microprocessor (6) computes amplitude values of the sensor signals expected in dependence upon the temperature value supplied by the temperature sensor (7), compares these values with the actual amplitude values of the sensor signals, and generates an error signal when the deviation between the expected and actual amplitude values exceeds a predetermined limit value.
Claims14
An arrangement for angle measurement by means of an angle sensor (1) supplying two sensor signals which are phase-shifted by 90 degrees relative to each other and whose amplitudes are dependent on the temperature, characterized in that the arrangement comprises a temperature sensor (7) and a microprocessor (6), and in that the microprocessor (6) computes amplitude values of the sensor signals expected in dependence upon a temperature value supplied by the temperature sensor (7), compares these values with the actual amplitude values of the sensor signals, and generates an error signal when the deviation between the expected and actual amplitude values exceeds a predetermined limit value, and wherein the temperature sensor (7) supplies an analog signal which is converted into a digital signal by means of a third ND converter (9) and is coupled to the microprocessor.
An arrangement for angle measurement by means of an angle sensor (1) supplying two sensor signals which are phase-shifted by 90 degrees relative to each other and whose amplitudes are dependent on the temperature, characterized in that the arrangement comprises a temperature sensor (7) and a microprocessor (6), and in that the microprocessor (6) computes amplitude values of the sensor signals expected in dependence upon a temperature value supplied by the temperature sensor (7), compares these values with the actual amplitude values of the sensor signals, and generates an error signal when the deviation between the expected and actual amplitude values exceeds a predetermined limit value, and wherein the microprocessor (6) supplies an angle signal indicating the computed angle, which signal is converted into an analog angle signal by means of a D/A converter (1), in that a multiplexer (8) is provided, whose first input receives the analog angle signal and whose second input receives the output signal of the temperature sensor (7), and which is succeeded by a third A/D converter (9), whose output signal is coupled to the microprocessor, and in that the microprocessor (6) couples the multiplexer (8) to its second input for determining the expected amplitude values of the sensor signals and to its first input for checking the output signal indicating the computed angle.
Dependencies are inferred from the claim text.