Electromagnetic actuation device and camshaft phasing device

Abstract

The application provides an electromagnetic actuating device and a camshaft phase adjustment device. The electromagnetic actuating device comprises a housing (H) and at least one execution unit. The execution unit comprises an electromagnet (10) and a pin partially extending out of the housing (H) and used to reciprocate in an axial direction (A) under the drive of the electromagnet (10). The execution unit further comprises a magnetic element and a magnetic field detection device used to detect the position of the pin. The magnetic element and the magnetic field detection device are both arranged stationary relative to the housing (H). The pin is arranged axially spaced from the magnetic element during the movement away from or close to the magnetic element and affects the magnetic field around the magnetic element. The magnetic field detection device is used to detect the change of the magnetic field signal around the magnetic element so as to determine the position of the pin in the axial direction (A). The electromagnetic actuating device according to the application is simple in structure and high in reliability.

Description

Technical Field

[0001] This invention relates to the field of actuators, and more specifically to an electromagnetic actuation device and a camshaft phase adjustment device. Background Technology

[0002] Chinese patent publication CN106640255A discloses a camshaft slider control system, which drives a pin by electromagnetic force, causing the pin to slide in a groove, thereby pushing the slider to move along the axial direction of the camshaft to achieve different valve lifts. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic actuator and a camshaft phase adjustment device that are easy to control and have high reliability.

[0004] According to a first aspect of the present invention, an electromagnetic actuation device is provided, comprising a housing and at least one actuating unit, the actuating unit including an electromagnet and a pin, the pin partially extending out of the housing, and the pin being configured to reciprocate axially under the drive of the electromagnet, wherein...

[0005] The execution unit further includes a magnetic component and a magnetic field detection device for detecting the position of the pin. Both the magnetic component and the magnetic field detection device are stationary relative to the housing. During movement away from or towards the magnetic component, the pin maintains an axial distance from the magnetic component and can influence the magnetic field around the magnetic component.

[0006] The magnetic field detection device is used to detect changes in the magnetic field signal around the magnetic component, thereby determining the position of the pin in the axial direction.

[0007] In at least one embodiment, the intensity of the detection signal is linearly related to the distance of the pin from the magnetic element in the axial direction.

[0008] In at least one embodiment, the line connecting the south and north poles of the magnetic element passes through or is parallel to the axial direction.

[0009] In at least one embodiment, the magnetic field detection device is disposed between the magnetic element and the pin along the axial direction.

[0010] In at least one embodiment, the pin and the magnetic element are coaxially arranged in the axial direction.

[0011] In at least one embodiment, the pin is made of a soft magnetic material.

[0012] In at least one embodiment, there are two execution units arranged side by side, and two pins of the two execution units extend partially from the same end in the axial direction of the housing.

[0013] In at least one embodiment, the electromagnetic actuation device includes a signal processing unit, which is configured to convert two detection signals from the two execution units into a processed signal located in a first numerical range and a processed signal located in a second numerical range, respectively.

[0014] The first numerical interval and the second numerical interval overlap at most one endpoint.

[0015] In at least one embodiment, the first numerical range and the second numerical range coincide at only one endpoint, which corresponds to the state where neither of the two pins is extended.

[0016] According to a second aspect of the present invention, a camshaft phase adjustment device is provided, comprising an electromagnetic actuation device according to the present invention, the electromagnetic actuation device being used to adjust the position of the camshaft of an engine, wherein the direction of movement of the pin is perpendicular to the axis of the camshaft.

[0017] The electromagnetic actuation device according to the present invention has a simple structure and high reliability. The camshaft phase adjustment device according to the present invention has the same advantages. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of an electromagnetic actuation device according to an embodiment of the present invention (wherein the electromagnetic actuation device is in its initial position).

[0019] Figure 2 This is a schematic diagram of an electromagnetic actuation device in a first position according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of an electromagnetic actuation device in a second position according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the first pin of an electromagnetic actuator according to an embodiment of the present invention moving to a fully extended state.

[0022] Figure 5 This is a schematic diagram of an electromagnetic actuator according to an embodiment of the present invention, with the first pin in an unextended state.

[0023] Figure 6 It is a graph showing the detection signal of the first magnetic field detection device and the magnetic field strength near the first magnetic field detection device as a function of the reciprocating motion of the first pin in an electromagnetic actuation device according to an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the connection circuit between two magnetic field detection devices and a signal processing unit of an electromagnetic actuation device according to an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the processed signal after the detection signal of the first magnetic field detection device in an electromagnetic actuation device according to an embodiment of the present invention is converted by a signal processing unit.

[0026] Figure 9 This is a schematic diagram of the processed signal after the detection signal of the second magnetic field detection device in an electromagnetic actuation device according to an embodiment of the present invention is converted by a signal processing unit.

[0027] Figure 10 This is a schematic diagram illustrating the arrangement of two pins, two corresponding magnetic components, and two magnetic field detection devices in an electromagnetic actuation device according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] P1 First pin; P2 Second pin; M1 First magnetic component; M2 Second magnetic component; S1 First magnetic field detection device; S2 Second magnetic field detection device; SP Spring; PS Signal processing unit; SgH Signal processing unit;

[0030] VD1 is the first voltage divider circuit; VD2 is the second voltage divider circuit; OA1 is the first processing unit; OA2 is the second processing unit;

[0031] H is the housing; H1 is the main housing; H2 is the end housing;

[0032] 10 Electromagnet; 11 Coil; 12 Armature; 13 Push rod; 14 Stationary iron core; 15 Lever; A Axial; R Radial. Detailed Implementation

[0033] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement the present invention, and are not intended to exhaustively describe all possible ways of the invention, nor to limit the scope of the invention.

[0034] In the movement of the pin in an electromagnetic actuator, one possible way to detect the pin's position is to fix a magnet to the pin. A fixed magnetic field detection device is then used to detect changes in the magnetic field, thereby determining the pin's position.

[0035] However, because the pin moves at high speed and impacts the groove wall during the operation of the electromagnetic actuator, there is a risk that the magnet fixed to the pin may fall off or fail (e.g., demagnetize).

[0036] The inventors made this invention considering several situations, including those described above.

[0037] Reference Figures 1 to 10 Taking an actuation device applied to the camshaft of an engine as an example, this paper introduces the electromagnetic actuation device according to this application and its working principle. Unless otherwise specified, in the figures, A represents the axial direction of the electromagnetic actuation device, which is parallel to the axial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuation device. For convenience, the axial direction of the first pin P1 or the second pin P2 is also referred to as axial direction A; R represents the radial direction of the electromagnetic actuation device, which is parallel to the radial direction of the first pin P1 (or the second pin P2) in the electromagnetic actuation device. For convenience, the radial direction of the first pin P1 or the second pin P2 is also referred to as radial direction R.

[0038] It should be understood that although axial and radial expressions are used here, the electromagnetic actuator and / or the first pin P1 and / or the second pin P2 do not necessarily have to be cylindrical or cylindrical in shape as a whole. The axial direction A can correspond to the length direction of the first pin P1 and / or the second pin P2, and the radial direction R can correspond to the direction perpendicular to the aforementioned axial direction A.

[0039] Reference Figure 1 The electromagnetic actuation device according to this application includes a housing H and two actuation units partially housed in the housing H.

[0040] The first execution unit includes an electromagnet 10, a first magnetic component M1, a first magnetic field detection device S1, and a first pin P1; the second execution unit includes an electromagnet 10, a second magnetic component M2, a second magnetic field detection device S2, and a second pin P2.

[0041] The housing H includes a main housing H1 and an end housing H2. The main housing H1 is mainly used to house two electromagnets 10, and the end housing H2 is mainly used to house two pins. The end housing H2 is provided with two through holes that extend in the axial direction A. Each pin passes through one through hole, and the pins are guided to move in the axial direction A by means of the through holes.

[0042] The first and second execution units are arranged side-by-side and symmetrically, such that the first pin P1 and the second pin P2 are axially parallel. Furthermore, the first pin P1 and the second pin P2 partially extend from the same end along the axial direction A of the housing H. Hereinafter, the end of the first pin P1 and the second pin P2 extending out of the housing H is referred to as the outer end, and the end of the first pin P1 and the second pin P2 located inside the housing H is referred to as the inner end.

[0043] A spring SP is provided between the pin (first pin P1 or second pin P2) and the end housing H2. The spring SP applies a preload force to the pin toward the interior of the housing. The pin can be driven by the electromagnet 10 to compress the spring SP and increase its length extending out of the housing H. After the driving force of the electromagnet 10 decreases or is removed, the pin can retract into the housing H at least partially under the action of the spring SP.

[0044] The outer end of the pin is used to extend into a slot in the engine camshaft, the axis of which is perpendicular to the pin's axial direction A. As the pin reciprocates along axial direction A, the camshaft can be displaced along its axis, thus providing different valve lifts.

[0045] Specifically, the camshaft groove can be formed spirally on the outer circumferential surface of the camshaft, that is, the groove is a spiral groove. When the camshaft rotates, since the positions of the first pin P1 and the second pin P2 in the axial direction of the camshaft are fixed, the spiral groove abuts against the first pin P1 or the second pin P2, thereby causing the camshaft to be displaced along its axial direction.

[0046] Each electromagnet 10 may include a coil 11, an armature 12, a push rod 13, a stationary iron core 14, and a lever 15.

[0047] The armature 12 is fixedly connected to the push rod 13, which is made of a non-magnetic material (e.g., stainless steel). The push rod 13 rests against the middle of the lever 15, which is also made of a non-magnetic material. This is to prevent the operation of the electromagnet 10 from interfering with the magnetic field detection device.

[0048] The end of lever 15 closest to the radially outer side of the electromagnetic actuator (hereinafter referred to as the fulcrum end) serves as the fulcrum, while the end of lever 15 closest to the radially inner side of the electromagnetic actuator (hereinafter referred to as the push end) abuts against the end of the pin (first pin P1 or second pin P2) located inside the housing H. In the axial direction A, the stroke of the push end of lever 15 is greater than the stroke of the middle portion of lever 15, allowing the pin's stroke to be greater than the stroke of push rod 13. That is, lever 15 amplifies the stroke of the actuating component; for example, in the axial direction A, for every unit distance the push rod 13 moves, the pin can move two units. This effectively increases the response speed of the electromagnetic actuator.

[0049] Furthermore, the use of lever 15 also makes the actuating part (e.g., armature 12) of electromagnet 10 further away from the magnetic elements (first magnetic element M1 and second magnetic element M2) and magnetic field detection devices (first magnetic field detection device S1 and second magnetic field detection device S2) described below in the radial direction R, so that the influence of electromagnet 10 on the detection signal of magnetic field detection device is small (this influence can be ignored).

[0050] The magnetic components (first magnetic component M1 and second magnetic component M2) and the magnetic field detection devices (first magnetic field detection device S1 and second magnetic field detection device S2) are both fixedly arranged relative to the housing H.

[0051] The first magnetic component M1 and the first magnetic field detection device S1 are located near the inner end of the first pin P1, and the second magnetic component M2 and the second magnetic field detection device S2 are located near the inner end of the second pin P2.

[0052] The magnetic component is, for example, a permanent magnet, and the magnetic field detection device is, for example, a Hall sensor. The pin is made of a magnetically conductive material, or at least the end of the pin located inside the housing H (the upper or inner end) is made of a magnetically conductive material. The magnetically conductive material is preferably a soft magnetic material.

[0053] During the reciprocating motion of the first pin P1 along axis A, the detection signal of the first magnetic field detection device S1 changes, thereby determining the position of the first pin P1 along axis A; during the reciprocating motion of the second pin P2 along axis A, the detection signal of the second magnetic field detection device S2 changes, thereby determining the position of the second pin P2 along axis A.

[0054] Optionally, when viewed along axis A, the first magnetic component M1, the first magnetic field detection device S1, and the first pin P1 at least partially overlap, and the second magnetic component M2, the second magnetic field detection device S2, and the second pin P2 at least partially overlap.

[0055] Optionally, the line connecting the south and north poles of the first magnetic element M1 is parallel to axis A, and the line connecting the south and north poles of the second magnetic element M2 is parallel to axis A.

[0056] Optionally, the centers of the first magnetic component M1 and the first magnetic field detection device S1 are both on the axis of the first pin P1, and the centers of the second magnetic component M2 and the second magnetic field detection device S2 are both on the axis of the second pin P2.

[0057] Optionally, along axis A, the first magnetic field detection device S1 is located between the first magnetic element M1 and the first pin P1, and the second magnetic field detection device S2 is located between the second magnetic element M2 and the second pin P2.

[0058] The first pin P1 does not directly contact the first magnetic field detection device S1 and the first magnetic component M1, and the second pin P2 does not directly contact the second magnetic field detection device S2 and the second magnetic component M2, so as to avoid the pin colliding with the magnetic field detection device or the magnetic component during the movement.

[0059] Optionally, the first magnetic field detection device S1 can be directly connected to the first magnetic component M1, and the second magnetic field detection device S2 can be directly connected to the second magnetic component M2. For example, the first magnetic field detection device S1 is bonded to the first magnetic component M1, and the second magnetic field detection device S2 is bonded to the second magnetic component M2.

[0060] Next, refer to Figures 1 to 5 Taking the first execution unit as an example, this paper introduces how the magnetic field detection device determines the position of the pin based on the change of the detection signal.

[0061] definition Figure 1 In the state shown, both the first pin P1 and the second pin P2 are in the non-extended state (or more accurately, the state in which the size of the extended housing H corresponding to the first pin P1 and the second pin P2 during the reciprocating motion is the smallest). The electromagnetic actuator in this state is also referred to as being in the initial position C0. Figure 2 In the state shown, the first pin P1 is in the fully extended state (or more accurately, this state corresponds to the state in which the first pin P1 extends the housing H to its maximum size during the reciprocating motion), and the second pin P2 is in the non-extended state. The electromagnetic actuator in this state is also referred to as being in the first position C1. Figure 3 In the state shown, the first pin P1 is in the closed state and the second pin P2 is in the fully extended state. The electromagnetic actuator in this state is also referred to as being in the second position C2.

[0062] Reference Figure 4 When the first pin P1 is fully extended, the distance between the first pin P1 and the first magnetic component M1 is relatively large, and the influence of the first pin P1 on the magnetic field of the first magnetic component M1 is very small and can be ignored. Assuming that the end of the first magnetic component M1 facing the first pin P1 along the axial direction A is the N pole (north pole) and the other end is the S pole (south pole), the magnetic field measured by the first magnetic field detection device S1 is the magnetic field of the first magnetic component M1 itself, and the magnetic induction lines start from the north pole of the first magnetic component M1 and return to the south pole of the first magnetic component M1.

[0063] Reference Figure 5 When the first pin P1 is not extended, the distance between the first pin P1 and the first magnetic element M1 is very small, for example, no more than 1 mm. At this time, the first pin P1, made of soft magnetic material, is magnetized by the first magnetic element M1 and becomes magnetic. For example, Figure 5 The inner end of the first pin P1 will be magnetized to form a south pole. The first pin P1 and the first magnetic component M1 will attract each other, and the magnetic field strength between them will increase. The magnetic field measured by the first magnetic field detection device S1 is a combination of the magnetic field of the first magnetic component M1 itself and the strong magnetic field generated by the mutual attraction between the first pin P1 and the first magnetic component M1. This makes the detection signal of the first magnetic field detection device S1 in this state greater than the detection signal when the first pin P1 is fully extended.

[0064] Since soft magnetic materials are easily magnetized when they are close to a magnet and easily demagnetized when they are far away from a magnet, the intensity of the detection signal of the first magnetic field detection device S1 is positively correlated with the distance of the first pin P1 from the first magnetic component M1 in the axial direction A.

[0065] It should be understood that the positive correlation here includes both the detection signal intensity being a linear function of the aforementioned distance and the detection signal intensity being a nonlinear function of the aforementioned distance.

[0066] Figure 6 The solid line in the figure shows the relationship between the intensity of the detection signal and the position of the first pin P1, while the long dashed line shows the relationship between the magnetic field strength and the position of the first pin P1.

[0067] Figure 6 The vertical axis on the left side represents the detected signal SgO, with units of VDC (direct current voltage in volts). Figure 6 The vertical axis on the right represents the magnetic field strength SgM, measured in Tesla (T), while the horizontal axis represents the position of the electromagnetic actuator. As shown in the figure, during the retraction of the first pin P1 (the electromagnetic actuator switches from the first position C1 to the initial position C0), the signal detected by the first magnetic field detection device S1 increases from its minimum value Sg1 to its maximum value Sg2; the extension process of the first pin P1 is the opposite.

[0068] It should be understood that the magnetic field signal detection of the second execution unit is similar to that of the first execution unit. For example, during the retraction of the second pin P2 (when the electromagnetic actuator switches from the second position C2 to the initial position C0), the detection signal increases from the minimum value Sg1 to the maximum value Sg2; the extension process of the second pin P2 is the opposite.

[0069] Reference Figure 7 In order to simplify the device structure and prevent the output lines of the sensor signals from occupying too much of the ECU (electronic control unit) interface, the electromagnetic actuation device in this embodiment also includes a signal processing unit PS.

[0070] The signal processing unit PS converts the two detection signals from the two execution units into processed signals SgH located in a first numerical range and a second numerical range, respectively. The first and second numerical ranges overlap only at their endpoints. These overlapping endpoints are referred to as the overlapping endpoints, and they represent positions where neither the first pin P1 nor the second pin P2 extends.

[0071] It is understandable that the first and second numerical intervals can be completely different.

[0072] Preferably, the first pin P1 and the second pin P2 do not move in a direction away from the electromagnet 10 at the same time. More preferably, the electromagnets of the two actuators are not energized at the same time, so that while one pin is moving, the other pin remains in the unextended position.

[0073] Therefore, the positions of the first pin P1 and the second pin P2 can be uniquely determined based on the processed signal SgH.

[0074] Comparison Figure 6 and Figure 8 The signal processing unit can convert the detection signal of the first magnetic field detection device S1 located in the interval [Sg2, Sg1] into a processing signal located in the interval [S11, S12]. Correspondingly, the detection signal value Sg2 is converted into the processing signal value S11, and the detection signal value Sg1 is converted into the processing signal value S12. Furthermore, the signal processing unit can convert the detection signal of the second magnetic field detection device S2 located in the interval [Sg2, Sg1] into a processing signal located in the interval [S21, S22]. Correspondingly, the detection signal value Sg2 is converted into the processing signal value S21, and the detection signal value Sg1 is converted into the processing signal value S22.

[0075] For example, when the first pin P1 is fully extended, the detection signal of the first magnetic field detection device S1 reaches the minimum value of 0V, and the processed signal SgH = 5V is output after processing by the signal processing unit PS; when the first pin P1 is not extended, the detection signal of the first magnetic field detection device S1 reaches the maximum value of 5V, and the processed signal SgH = 2.5V is output after processing by the signal processing unit PS; that is, correspondingly, the signal processing unit PS converts the signal of the first magnetic field detection device S1 located in the interval [0V, 5V] into a signal located in the interval [5V, 2.5V]. When the second pin P2 is fully extended, the detection signal of the second magnetic field detection device S2 reaches the minimum value of 0V, and the processed signal SgH = 0V is output after processing by the signal processing unit PS; when the second pin P2 is not extended, the detection signal of the second magnetic field detection device S2 reaches the maximum value of 5V, and the processed signal SgH = 2.5V is output after processing by the signal processing unit PS; that is, correspondingly, the signal processing unit PS converts the signal of the first magnetic field detection device S1 located in the interval [0V, 5V] into a signal located in the interval [0V, 2.5V].

[0076] Back Figure 7 This paper introduces the implementation method of the signal processing unit PS in processing the detection signal.

[0077] The signal processing unit PS includes a first voltage divider circuit VD1, a second voltage divider circuit VD2, a first processing unit OA1, and a second processing unit OA2. In the figure, V1 and VG represent the input voltage line and the ground line, respectively.

[0078] The first voltage divider circuit VD1 is connected to the output terminal of the first magnetic field detection device S1 and the input terminal of the first processing unit OA1.

[0079] The first voltage divider circuit VD1 is used to reduce the amplitude of the detection signal Sg10 of the first magnetic field detection device S1, for example, by halving the value of the signal, and converting the signal located in the interval [0V, 5V] into a signal located in the interval [0V, 2.5V].

[0080] The first processing unit OA1 is used to process the output signal of the first voltage divider circuit VD1. For example, it subtracts the output signal of the first voltage divider circuit VD1 from half the maximum value of the detection signal of the first magnetic field detection device S1 (e.g., half of 5V is 2.5V) to obtain the processed signal Sg11. Alternatively, the first processing unit OA1 multiplies the output signal of the first voltage divider circuit VD1 by -1 and then adds half the maximum value of the detection signal of the first magnetic field detection device S1. The range of the signal Sg11 is [2.5V, 0V].

[0081] The second voltage divider circuit VD2 is connected to the output terminal of the second magnetic field detection device S2 and the input terminal of the second processing unit OA2. The second voltage divider circuit VD2 is used to reduce the amplitude of the detection signal Sg20 of the second magnetic field detection device S2, for example, by halving the value of the signal, and converting the signal located in the range [0V, 5V] into the signal located in the range [0V, 2.5V].

[0082] The second processing unit OA2 is used to process both the output signal Sg21 from the second voltage divider circuit VD2 and the output signal Sg11 from the first processing unit OA1.

[0083] For the output signal Sg11 from the first processing unit OA1, the second processing unit OA2 adds half of the maximum value of the detected signal to this signal and outputs it as the processed signal SgH. For the output signal Sg21 from the second voltage divider circuit VD2, the second processing unit OA2 directly outputs this signal as the processed signal SgH.

[0084] According to the above conversion rules, the processed signal SgH can be restored to the detection signal of the first magnetic field detection device S1 and the detection signal of the second magnetic field detection device S2, thereby obtaining the motion state and position of the first pin P1 and the second pin P2.

[0085] For example, when the value of the processing signal SgH is greater than 2.5V, it indicates that the first pin P1 is at least partially extended; when the value of the processing signal SgH is equal to 5V, it indicates that the first pin P1 is fully extended. When the value of the processing signal SgH is less than 2.5V, it indicates that the second pin P2 is at least partially extended. When the value of the processing signal SgH is equal to 0V, it indicates that the second pin P2 is fully extended. When the value of the processing signal SgH is equal to 2.5V, it indicates that neither the first pin P1 nor the second pin P2 is extended. Of course, according to the specific calculation rules, the extension distance of the extended pins can also be determined, which will not be elaborated further.

[0086] This invention has at least one of the following advantages:

[0087] (i) Since the magnetic component is fixed relative to the housing H and does not reciprocate with the pin, the magnetic component is not easy to fall off or be damaged.

[0088] (ii) The magnetic components and the magnetic field detection device are relatively stationary, so the measured magnetic field strength is more accurate and the position control of the pin is more accurate.

[0089] (iii) The output signals of the two sensors are processed into a segmented signal by the signal processing unit, which simplifies the output circuit of the electromagnetic actuator and allows only one output port to be set.

[0090] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art, under the guidance of the present invention, can make various modifications to the above-described embodiments without departing from the scope of the present invention. For example:

[0091] (i) The electromagnetic actuation device according to this application may have only one actuation unit.

[0092] (ii)Reference Figure 10 The magnetic poles of the first magnetic element M1 and the second magnetic element M2, which come from the two execution units, can be arranged in opposite directions, that is, the south pole of one magnetic element can face the pin and the north pole of the other magnetic element can face the pin. Of course, the magnetic poles of the two magnetic elements can also be arranged in the same direction.

[0093] (iii) The processing method of the output signals of the two execution units in this application is not limited to this.

[0094] Optionally, the output signals of the two execution units can be output to the same or different processing units via different lines for separate processing.

[0095] Even when the output signals of the two execution units are processed to be non-overlapping or only the endpoints (where the endpoints can represent the same value in the signal curve, such as the same voltage, rather than a point in the signal curve) overlap, other processing units or operation methods can be used, as long as the processing signals of the first execution unit and the processing signals of the second execution unit can be transmitted on the same line and can be easily distinguished.

[0096] (iv) In addition to adjusting the camshaft of an engine, the electromagnetic actuation device according to the present invention can also actuate other devices.

Claims

1. An electromagnetic actuation device, comprising a housing (H) and at least one actuating unit, the actuating unit comprising an electromagnet (10) and a pin, the pin extending partially out of the housing (H) and the pin being configured to reciprocate in an axial direction (A) under the drive of the electromagnet (10), characterized in that, The execution unit further includes a magnetic component and a magnetic field detection device for detecting the position of the pin. Both the magnetic component and the magnetic field detection device are stationary relative to the housing (H). During movement away from or towards the magnetic component, the pin maintains an axial distance from the magnetic component and can influence the magnetic field around the magnetic component. The magnetic field detection device is used to detect changes in the magnetic field signal around the magnetic component, thereby determining the position of the pin in the axial direction (A).

2. The electromagnetic actuation device according to claim 1, characterized in that, The intensity of the detection signal is linearly related to the distance of the pin from the magnetic element in the axial direction (A).

3. The electromagnetic actuation device according to claim 1, characterized in that, The line connecting the south and north poles of the magnetic component passes through or is parallel to the axial direction (A).

4. The electromagnetic actuation device according to claim 1, characterized in that, Along the axial direction (A), the magnetic field detection device is disposed between the magnetic component and the pin.

5. The electromagnetic actuation device according to claim 1, characterized in that, The pin and the magnetic component are coaxially arranged in the axial direction.

6. The electromagnetic actuation device according to claim 1, characterized in that, The pin is made of soft magnetic material.

7. The electromagnetic actuation device according to any one of claims 1 to 6, characterized in that, There are two execution units arranged side by side, and the two pins of the two execution units extend partially from the same end on the axial direction (A) of the housing (H).

8. The electromagnetic actuation device according to claim 7, characterized in that, The electromagnetic actuation device includes a signal processing unit (PS), which is used to convert the two detection signals from the two execution units into a processed signal located in a first numerical range and a processed signal located in a second numerical range, respectively. The first numerical interval and the second numerical interval overlap at most one endpoint.

9. The electromagnetic actuation device according to claim 8, characterized in that, The first numerical range and the second numerical range coincide at only one endpoint, which corresponds to the state where neither of the two pins is extended.

10. A camshaft phase adjustment device, characterized in that, The device includes the electromagnetic actuation device according to any one of claims 1 to 9, the electromagnetic actuation device being used to adjust the position of the camshaft of an engine, wherein the direction of movement of the pin is perpendicular to the axis of the camshaft.

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