Magnetic sensor arrangement for determining a position of an actuator

Patent metadata

Field	Value
Publication number	US-10385891-B2
Application number	US-201715706463-A
Country	US
Kind code	B2
Filing date	Sep 15, 2017
Priority date	Sep 15, 2017
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A magnetic sensor arrangement for determining a position of an actuator may include a magnetic sensor to determine the position of the actuator, where the actuator may be configured to reciprocate along a longitudinal axis of an actuator housing of the actuator, such that at least a portion of the actuator may cross an end plane of the actuator housing when reciprocating along the longitudinal axis, and the magnetic sensor may sense a set of components of a magnetic field generated by a magnet, and determine, based on the sensed set of components of the magnetic field, a position of the actuator along the longitudinal axis of the actuator housing of the actuator, where the magnet may be connected to or forms part of the actuator, and where the magnetic sensor may be connected to the actuator housing, and where a portion of the magnetic sensor may be positioned at least in a first actuator position beyond the end plane of the actuator housing.

First claim

What is claimed is:

1. A magnetic sensor arrangement for determining a position of an actuator, the magnetic sensor arrangement comprising:
a magnetic sensor to determine the position of the actuator,
the actuator being configured to reciprocate along a longitudinal axis of an actuator housing of the actuator such that at least a portion of the actuator is to cross an end plane of the actuator housing when reciprocating along the longitudinal axis,
a magnet being connected to or forming part of the actuator, and being movable by the actuator to be in the actuator housing at a first time, entering or exiting the actuator housing at a second time, and outside of the actuator housing at a third time, and
where the magnetic sensor is to:
sense a set of components of a magnetic field generated by the magnet;
determine, based on the sensed set of components of the magnetic field, the position of the actuator along the longitudinal axis of the actuator housing of the actuator,
the magnetic sensor being connected to the actuator housing, and
a portion of the magnetic sensor being positioned at least in a first actuator position beyond the end plane of the actuator housing; and
determine that the magnet is one of:
in the actuator housing,
entering or exiting the actuator housing, or
outside of the actuator housing.

2. The magnetic sensor arrangement of claim 1 , where the portion of the magnetic sensor includes a set of magneto-sensitive elements,
the set of magneto-sensitive elements to sense the set of components of the magnetic field.

3. The magnetic sensor arrangement of claim 2 , where the set of magneto-sensitive elements includes at least two magneto-sensitive elements, and
where the magnetic sensor is further to:
perform a differential measurement of the set of components of the magnetic field based on the at least two magneto-sensitive elements sensing the set of components of the magnetic field.

4. The magnetic sensor arrangement of claim 1 , where a first edge of the magnet is substantially aligned with the end plane of the actuator housing or within the actuator housing when the actuator is in a first position on the longitudinal axis, and
where a second edge of the magnet is within the actuator housing when the actuator is in the first position on the longitudinal axis.

5. The magnetic sensor arrangement of claim 4 , where the first edge of the magnet is beyond the end plane of the actuator housing when the actuator is in a second position on the longitudinal axis,
the first position being a closed valve position and the second position being an open valve position.

6. The magnetic sensor arrangement of claim 4 , where the first edge of the magnet is beyond the end plane of the actuator housing when the actuator is in a second position on the longitudinal axis, and
where the magnetic sensor is further to:
detect the position of the actuator as the actuator reciprocates between the first position and the second position.

7. The magnetic sensor arrangement of claim 1 , where the magnetic sensor is connected to the actuator housing by at least one of:
adhering a sensor housing of the magnetic sensor to the actuator housing with an adhesive,
over molding the sensor housing of the magnetic sensor to the actuator housing,
fastening the sensor housing of the magnetic sensor to the actuator housing using a fastener,
clipping the sensor housing of the magnetic sensor to the actuator housing, or
clamping the sensor housing of the magnetic sensor to the actuator housing.

8. The magnetic sensor arrangement of claim 1 , where the actuator comprises an actuator of a hydraulic actuator system that is connected to a valve.

9. The magnetic sensor arrangement of claim 8 , where the valve comprises a valve of an internal combustion engine.

10. The magnetic sensor arrangement of claim 1 , where the set of components include at least one of:
an intensity of the magnetic field,
the intensity including at least one of an axial component measurement of the magnetic field or a radial component measurement of the magnetic field,

a magnitude of the magnetic field, or
a direction of the magnetic field.

11. A hydraulic actuator system, comprising:
an actuator capable of reciprocating along a longitudinal axis of an actuator housing of the actuator;
a magnet connected to or formed as part of the actuator such that the magnet moves along the longitudinal axis extending from an end plane of the actuator housing,
the magnet being movable by the actuator to be in the actuator housing at a first time, entering or exiting the actuator housing at a second time, and outside of the actuator housing at a third time; and

a magnetic sensor to:
determine a position of the actuator on the longitudinal axis of the actuator housing based on sensing a set of components of a magnetic field applied to the magnetic sensor by the magnet,
a portion of the magnetic sensor extending beyond the end plane of the actuator housing, and

determine that the magnet is one of:
in the actuator housing,
entering or exiting the actuator housing, or
outside of the actuator housing.

12. The hydraulic actuator system of claim 11 , wherein the portion of the magnetic sensor that extends beyond the end plane includes a set of magneto-sensitive elements,
where the set of magneto-sensitive elements are to sense the set of components of the magnetic field of the magnet.

13. The hydraulic actuator system of claim 11 , where a first edge of the magnet is substantially aligned with the end plane of the actuator housing or within the actuator housing when the actuator is in a first position on the longitudinal axis, and
where a second edge of the magnet is within the actuator housing when the actuator is in the first position on the longitudinal axis.

14. The hydraulic actuator system of claim 13 , where the first edge of the magnet is beyond the end plane of the actuator housing when the actuator is in a second position on the longitudinal axis, and
where the magnetic sensor is further to:
detect when the actuator reciprocates between the first position and the second position.

15. The hydraulic actuator system of claim 13 , where the first edge of the magnet is beyond the end plane of the actuator housing when the actuator is in a second position on the longitudinal axis, and
where the magnetic sensor is further to:
detect the position of the actuator as the actuator reciprocates between the first position and the second position.

16. The hydraulic actuator system of claim 11 , where the actuator comprises a cavity, and
where the magnet is overmolded to the actuator by filling the cavity with a magnetic mold material,
the magnetic mold material to form the magnet.

17. The hydraulic actuator system of claim 11 , where the magnetic sensor is connected to the actuator housing such that at least one of:
a sensor housing of the magnetic sensor is adhered to the actuator housing with an adhesive,
the sensor housing of the magnetic sensor is over molded to the actuator housing,
the sensor housing of the magnetic sensor is fastened to the actuator housing,
the sensor housing of the magnetic sensor is clipped to the actuator housing, or
the sensor housing of the magnetic sensor is clamped to the actuator housing.

18. A method, comprising:
determining, by a device and based on a magnetic sensor sensing a set of components of a magnetic field of a magnet, a position of an actuator of a hydraulic actuator system,
the magnet being on the ac

Assignees

• Infineon Technologies Ag

Inventors

• Slama Peter
• Aichriedler Leo

Classifications

• F01L2301/00

  Using particular materials · CPC title

• F01L2820/045

  Valve lift · CPC title

• F01L2820/01

  Absolute values · CPC title

• F16K37/0041

  for measuring valve parameters (F16K37/0033 takes precedence) · CPC title

• Y10T137/8225

  Position or extent of motion indicator · CPC title