Sensor device for a vehicle, method for producing a sensor device for a vehicle, method for operating a sensor device for a vehicle, and sensor system for a vehicle

Patent metadata

Field	Value
Publication number	US-12092678-B2
Application number	US-202017594275-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Apr 16, 2019
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A sensor device for a vehicle, including: at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet; in which the magnetic field sensors are configured so that the resultant magnetic field from the sensing magnetic field and an external magnetic interference field from an interference source develops a different strength of effect in different magnetic field sensors. Also described are a related method, control apparatus/unit, sensor system, and computer readable medium.

First claim

The invention claimed is:

1. A sensor device for a vehicle, comprising:
at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet;
wherein the at least two magnetic field sensors are configured so that a resultant magnetic field from the sensing magnetic field and an interference magnetic field from an interference source develops a different strength of effect in different ones of the at least two magnetic field sensors, and
wherein at least one of the magnetic field sensors includes a shielding device for shielding at least one component of the sensing magnetic field and/or the interference magnetic field, and/or wherein at least one of the magnetic field sensors includes a concentrating device for concentrating at least one component of the sensing magnetic field and/or the interference magnetic field,
wherein the shielding device and/or the concentrating device is arranged within a housing of the sensor device, and
wherein the sensor device is configured to detect a size of a deviation between the sensing magnetic field and the magnetic interference field so that a comparator threshold is not exceeded.

2. The sensor device of claim 1 , wherein at least one of the magnetic field sensors includes the shielding device for shielding at least one component of the sensing magnetic field and/or the magnetic interference field and/or at least one of the magnetic field sensors includes the concentrating device for concentrating at least one component of the sensing magnetic field and/or the interference magnetic field.

3. The sensor device of claim 2 , wherein the device is configured to influence the sensing magnetic field and the magnetic interference field in different ways, and/or the device is arranged inside or outside the housing of the sensor device and/or the device is oriented and/or positioned depending on ambient magnetic conditions.

4. The sensor device of claim 2 , wherein at least one of the magnetic field sensors includes the shielding device and the concentrating device, wherein the devices act on the magnetic fields in different ways, or that at least a first of the magnetic field sensors includes the shielding device and at least a second of the magnetic field sensors includes the concentrating device.

5. The sensor device of claim 1 , wherein a detection orientation of at least one magnetic field sensor is rotated relative to at least one detection orientation of at least one other magnetic field sensor and/or that at least one of the magnetic field sensors includes a device for at least partially compensating for the magnetic interference field.

6. A sensor device for a vehicle, comprising:
at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet;
wherein the at least two magnetic field sensors are configured so that a resultant magnetic field from the sensing magnetic field and an interference magnetic field from an interference source develops a different strength of effect in different ones of the at least two magnetic field sensors, and
wherein the sensor device is configured to detect a size of a deviation between the sensing magnetic field and the magnetic interference field so that a comparator threshold is not exceeded.

7. A sensor device for a vehicle, comprising:
at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet;
wherein at least one of the magnetic field sensors includes a shielding device for shielding at least one component of the sensing magnetic field and/or the interference magnetic field, and/or wherein at least one of the magnetic field sensors includes a concentrating device for concentrating at least one component of the sensing magnetic field and/or the interference magnetic field,
wherein the shielding device and/or the concentrating device is arranged within a housing of the sensor device, and
wherein at least in portions of a solid angle range that the interference magnetic field occupies, a non-co-directional component of a signal error is greater than a co-directional component of the signal error, wherein the signal error represents a difference in a signal from one of the at least two magnetic field sensors between an absence of the interference magnetic field and a presence of the interference magnetic field.

8. The sensor device of claim 1 , wherein each of the magnetic field sensors is configured for at least two-axis magnetic field sensing, and wherein each of the at least two magnetic field sensors is configured to determine and output a magnetic angle determined from at least two magnetic field components in the respective axial direction.

9. The sensor device of claim 1 , wherein the vehicle is a utility vehicle and the at least two magnetic field sensors are configured for measuring a position of a sensing magnet when a magnetic interference field of up to 100 millitesla is present.

10. A method for producing a sensor device for a vehicle, the method comprising:
providing at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet; and
arranging and/or implementing the at least two magnetic field sensors so that a resultant magnetic field from the sensing magnetic field and an interference magnetic field of an interference source develops a different strength of effect in different ones of the at least two magnetic field sensors, and
wherein at least one of the magnetic field sensors includes a shielding device for shielding at least one component of the sensing magnetic field and/or the interference magnetic field, and/or wherein at least one of the magnetic field sensors includes a concentrating device for concentrating at least one component of the sensing magnetic field and/or the interference magnetic field,
wherein the shielding device and/or the concentrating device is arranged within a housing of the sensor device, and
wherein the sensor device is configured to detect a size of a deviation between the sensing magnetic field and the magnetic interference field so that a comparator threshold is not exceeded.

11. A method for operating a sensor device for a vehicle, the method comprising:
reading in sensor signals from the at least two magnetic field sensors of the sensor device, wherein the sensor device includes:
at least two magnetic field sensors for detecting a sensing magnetic field from a sensing magnet;
wherein the at least two magnetic field sensors are configured so that a resultant magnetic field from the sensing magnetic field and an interference magnetic field from an interference source develops a different strength of effect in different ones of the at least two magnetic field sensors, and
wherein at least one of the magnetic field sensors includes a shielding device for shielding at least one component of the sensing magnetic field and/or the interference magnetic field, and/or wherein at least one of the magnetic field sensors includes a concentrating device for concentrating at least one component of the sensing magnetic field and/or the interference magnetic field,
wherein the shielding device and/or the concentrating device is arranged within a housing of the sensor device, and
wherein the sensor device is configured to detect a size of a deviation between the sensing magnetic field and the magnetic interference field so that a comparator threshold is not exceeded; and

evaluating the sensor signals read in during the reading-in to determine properties of the sensing magnetic field.

12. A control apparatus for operating a sensor device for a vehicle, comprising:
a control unit configured to perform the following:
reading in

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Prams Stefan

Classifications

• G01R33/0017

  Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields · CPC title

• G01R29/0878

  Sensors; antennas; probes; detectors (wave guide measuring sections G01R1/24) · CPC title

• G01B7/30

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• G01D3/036

  on measuring arrangements themselves · CPC title

• G01R29/0892 Primary

  Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value · CPC title