SENSOR FOR MEASURING ANGULAR POSITION, AND MEASUREMENT COMPENSATION METHOD

• US 20130297252A1
• Filed: 10/28/2011
• Published: 11/07/2013
• Est. Priority Date: 11/18/2010
• Status: Active Grant

• Current Assignee: Vitesco Technologies GmbH (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Continental Automotive France (Continental AG), Continental Automotive GmbH (Continental AG)
• Inventors: Baissac, Jean-Marc
• Granted Patent: US 10,234,262 B2
• Time in Patent Office: Days
• US Class Current: 702/151
• CPC Class Codes: F02D 1/16 Adjustment of injection timing F02D1/02 takes precedence
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02P 5/15 Digital data processing
• CPC Class Codes: F02P 7/067 Electromagnetic pick-up devices , e.g. providing induced current in a coil
• CPC Class Codes: G01B 7/30 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for
• CPC Class Codes: G01D 5/24476 Signal processing G01D5/2448 - G01D5/24495 take precedence
• CPC Class Codes: G05B 11/011 details of the correcting means
• CPC Class Codes: G05B 13/02 electric
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: G06F 17/40 Data acquisition and logging for input to computer G06F3/00
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

Method for compensating a reference measurement including a measurement of angular position α and a measurement of time T1 that are simultaneous at the time t1, for an angular position sensor of the type including a toothed wheel, includes the following steps: determination of a first measurement α of corresponding angular position at the moment in time t1 when a reference measurement is desired; triggering of a software acquisition function; substantially simultaneous acquisitions of a second measurement α′ of the angular position and of a measurement T2 of the time by software acquisition at a time t2; estimation of an error ΔT; and calculation of the compensated measurement of time, T1=T2−ΔT. A Sensor for measuring angular position, of the type including a toothed wheel, implementing such a compensation method is described.

Claims

1. A method for compensating a reference measurement comprising a measurement of angular position α

and a measurement of time T1 that are simultaneous at a moment in time t1, for an angular position sensor of the type comprising a toothed wheel, characterized in that it comprises the following steps;

determination of a first measurement α

of the angular position at the moment in time t1 when a reference measurement is desired,

triggering of a software acquisition function, taking into account said function resulting in a time delay Δ

t,

substantially simultaneous acquisitions of a second measurement α

′

of the angular position and of a measurement T2 of the time by software acquisition at the time t2,

estimation of a time error Δ

T,

calculation of the measurement of time, T1=T2−

Δ

T.

2. The method as claimed in claim 1, where the time error Δ

T=T2−

T1 is calculated according to the formula;

3. The method as claimed in claim 1, where the determination of the first measurement of angular position α

comprises a hardware acquisition carried out by a hardware device performing an acquisition of the value of angular position at the moment in time t1 when a reference measurement is desired, and a software read of said measurement of angular position α

thus acquired.

4. The method as claimed in claim 3, where said hardware device generates an interrupt, at the time t1, which is used to trigger said software acquisition function.

5. A sensor for measuring angular position, of the type comprising a toothed wheel, characterized in that it comprises means for implementing the compensation method as claimed in claim 1.

6. The method as claimed in claim 2, where the determination of the first measurement of angular position α

comprises a hardware acquisition carried out by a hardware device performing an acquisition of the value of angular position at the moment in time t1 when a reference measurement is desired, and a software read of said measurement of angular position α

thus acquired.

7. The method as claimed in claim 6, where said hardware device generates an interrupt, at the time t1, which is used to trigger said software acquisition function.