KR20160001677A - Sensor device for determining at least one rotation property of a rotating element - Google Patents

Abstract

The present invention relates to a sensor device (10) for determining at least one rotation property of a rotating member (12). The sensor device (10) includes at least one transducer (14) and a transducer wheel (16). The transducer wheel (16) includes a saw needle (18), bottom profiles (20) between the saw needles (18) and at least one transducer wheel gap (26). The transducer (14) is formed to generate an output signal (46). The output signal (46) includes at least one first value (52) assigned to one of the saw needles (18), or a second value (54) assigned to one bottom profile (20). The transducer wheel gap (26) is formed so that the output signal (46) is assigned to the transducer wheel gap (26) and has a third value (56) different from the second value (54).

Description

TECHNICAL FIELD [0001] The present invention relates to a sensor device for determining at least one rotation characteristic of a rotary member,

The present invention relates to a sensor device for determining at least one rotational characteristic of a rotating member.

There are many known sensors in the prior art that detect at least one rotational characteristic of a rotating member. Rotational characteristics refer to general characteristics that at least partially represent the rotation of the rotating member. The rotational characteristics can be, for example, different characteristics characterizing rotation of each speed, rotational speed, angular acceleration, rotational angle, angular position, or continuous or discontinuous, identical or unequal type of rotational member . Examples of such sensors are known from Konrad Reif (publisher): In-Car Sensors, 1st Edition 2010, pages 63-73 and pages 120-129. The particular emphasis of the present invention lies in the detection of the rotational speed of the crankshaft or the camshaft, but the invention is not limited thereto.

It is known to use an incremental type transducer, for example in crankshaft and / or camshaft, when controlling an internal combustion engine. Transducer wheels with incremental marks are commonly used, including the teeth and the grooves, which are used in interaction with the signals of the crankshaft and the camshaft.

Such a transducer system uses an unequal arrangement of incremental marks. A typical implementation is a transducer wheel with 60 teeth separated by two teeth, i. E., 58 teeth, and a two-tooth transducer wheel gap.

Even with the advantages afforded by the sensors described above, the sensor device still has room for improvement. The purpose of the transducer wheel gap is to synchronize the motor control device with the crankshaft position. In this case, the motor controller continuously measures the time between two ground surfaces guided past the sensor. This causes the transducer wheel gap to be detected and the time from the tooth placed before the transducer wheel gap to the tooth placed after the transducer wheel gap is greater than the time between the remaining adjacent teeth. In other words, the time of the tooth-transducer wheel gap pair is greater than the time of the tooth-to-groove pair. However, if 1/2 hour for the tooth-transducer wheel gap pair is greater than the time of the tooth-in-groove pair, or if the motor control device is resynchronized to the wrong angle, or if the motor control device is already synchronized, Is changed because the motor control device no longer guarantees the correct position.

It is an object of the present invention to provide a sensor device for at least substantially preventing the aforementioned disadvantages and for determining at least one rotational characteristic of the rotating member, which is suitable for reliably recognizing the groove in the transducer wheel, especially in difficult boundary conditions .

This problem is solved by the sensor device according to claim 1.

A sensor device according to the invention for determining at least one rotational characteristic of a rotating member comprises at least one transducer and a transducer wheel. The transducer wheel includes teeth, teeth between the teeth, and at least one transducer wheel gap. The transducer is configured to generate an output signal. The output signal comprises at least one first value assigned to one of the teeth, or a second value assigned to the groove. The at least one transducer wheel gap is formed such that the output signal is assigned a transducer wheel gap and includes a third value having a different magnitude than the second value.

In particular, the third value may be less than the second value. The second value may be less than the first value. The transducer wheel gap preferably includes a groove in the transducer wheel. The grooves may have a depth of 0.1 mm to 1.0 mm. The output signal may be an analog output signal. Alternatively, the output signal may be a digital output signal, in particular a square wave signal. The output signal may in particular be an electrical output signal. For example, the output signal may be a voltage. The transducer may include at least one transducer element for supplying an output signal. The transducer element may be a Hall element. Alternatively, the transducer may be an inductive transducer. In the scope of the present invention, the rotation characteristic may be the rotation speed of the rotary member.

The sensor device may also include an incremental carrier connectable to the rotating member. The at least one incremental carrier may be a gear wheel. The gear wheel may be at least partially made of a ferromagnetic material. Alternatively or additionally, the at least one incremental carrier may be a magnetic multipolar wheel. The multipole wheel may be formed of, for example, particles having a partially alternating polarization that are permanent magnetic particles contained within the plastic. Likewise, at least one incremental carrier comprises a permanent magnetic region, and the incremental carrier is configured to form a vortex. The incremental carrier may preferably be the incremental carrier of the magnetic pole wheel type described above.

Incremental carrier means a carrier that is connectable or connected to a rotating member within the scope of the present invention. The carrier may be formed, for example, in the form of a transducer wheel. Incremental carriers are typically used in incremental measurement methods. The measurement methods often used in rotational speed sensors are based on the fact that the value variation per unit time is measured by counting the individual values, also referred to as incremental values, whereby different rotational properties, for example rotational speeds or other above- It is an incremental counting method. The incremental carriers typically include value transducers that are periodically disposed along one path, and each of the value transducers can be individually detected and cause an increase or decrease in the count value by increments, respectively. The incremental carrier is constituted by, for example, a gear wheel made of a magnetic material matched to a corresponding magnetic sensor, and when the gear wheel is moved through an external magnetic field, each tooth and each tooth Lt; RTI ID = 0.0 > detectable < / RTI > Likewise, an incremental carrier is formed in the form of a multipole wheel, which is formed by a sequence of permanent magnetic regions that typically have alternating magnetic polarization. Such a multipole wheel may be subjected to interference, for example by superimposing with an external magnetic field, by the formation of a plurality of intrinsic magnetic field regions, i. E. By measuring variations in the external magnetic field, A plurality of detectable magnetic events can be generated.

The sensor device may comprise at least one evaluation unit. The at least one evaluation unit may be configured to evaluate the output signal. The evaluation of the output signal generally refers to any and all process steps used to obtain information about the rotational characteristics of the rotating member from the output signal. For example, if the rotation characteristic is an absolute angular position, then the evaluation unit evaluates the output signal at least partially, preferably fully, and obtains the obtained information on the rotational characteristics of the rotary member in the form of a data signal, To a motor control device not included. In this case, for example, the motor control device receives information on the rotation characteristics from the evaluation unit, and the evaluation unit has to compare and / or check the accuracy of the respective information on the rotation characteristics in accordance with the information.

In addition, an evaluation of the entire individual output signals of the sensor device may be performed by an electronic evaluating device substantially aligned with the sensor device within the sensor device, so that information about the rotational characteristics can be obtained in approximately real time.

In a preferred embodiment of the sensor device with at least one evaluation unit, the at least one evaluation unit comprises a signal output portion. The at least one evaluation unit may be configured to provide, to its signal output, only one sensor signal of the estimated sensor signals, in accordance with the rotational speed of the rotational member. The rotation characteristic may be a rotational speed in particular.

Other optional details and features of the present invention are set forth in the description of a preferred embodiment schematically illustrated in the drawings.

1 is a schematic view of a sensor device according to the present invention;
2 is an output signal supplied by the sensor device;

Fig. 1 schematically shows the configuration of a sensor device 10 according to the invention for determining at least one rotational characteristic of a rotary member 12. Fig. The rotational characteristic is the rotational speed of the rotary member 12 in the illustrated embodiment. Of course, other rotational characteristics, e.g., angular velocity and angular acceleration, can also be detected by the sensor device 10.

The rotary member 12 is, for example, a crankshaft of an internal combustion engine. The sensor device 10 includes at least one transducer 14 and a transducer wheel 16. The transducer wheel 16 is connected to the rotating member 12. The transducer wheel 16 includes teeth 20 and teeth 20 between the teeth 18 and the teeth 18. For example, the transducer wheel 16 includes 58 teeth 18. The width 22 of the groove 20 may be the same as the width 24 of the tooth 18. The transducer wheel (16) also includes at least one transducer wheel gap (26). The transducer wheel gap 26 is formed differently from the groove 20 as described later. The transducer wheel gap 26 has a width 28 that is greater than the width 22 of the groove 20 or the width 24 of the tooth 18. The transducer wheel gap 26 has a width 28 that is four times the width 22 of the groove 20 or the width 24 of the tooth 18, for example. Thus, the transducer wheel 16 includes a number of teeth 18, i. E. 58 teeth, subtracted from 60, and the transducer wheel gap 16 of the two teeth 18 with corresponding grooves 20 (26). The transducer wheel gap 26 also includes a groove 30 formed in the transducer wheel 16. The groove 30 may have a depth 32 of 0.1 mm to 1.0 mm, for example 0.5 mm. The distance 34 between the tooth tip 36 and the surface 38 of the groove 20 is less than the distance 40 between the tooth tip 36 and the surface 42 of the groove 30. The surface 42 of the groove 30 is spaced from the tooth tip 36 more than the surface 38 of the groove 20. Of course, the grooves 30 may have a greater depth 32, depending on the respective application. That is, the groove 30 may have a depth 32 of greater than 1.0 mm, for example 1.5 mm, 2.0 mm or 5.0 mm, for example, for better distinction of the transducer wheel gap 26 from the groove 20 . The transducer 14 includes at least one transducer element 44. The transducer element 44 is, for example, a Hall element. The transducer 14 is configured to generate an output signal as described below.

Fig. 2 shows the output signal 46 supplied by the sensor device 10 or the transducer 14. Fig. The output signal 46 varies depending on whether the tooth 18, the groove 20, or the transducer wheel gap 26 is guided past the transducer 14. The output signal may in this case be the analog signal 46 as shown in Fig. A digital output signal, for example a rectangular wave signal, may be provided in accordance with the transducer element 44, for example. The output signal 46 is preferably an electrical output signal 48, such as a voltage having the waveform shown in FIG.

The output signal 46 has at least one first value 52 assigned to one tooth 18 or a second value 54 assigned to this groove 20. The output signal 46 therefore has a first value 52 when the tooth 18 passes through the transducer 14 or a second value 54 when the groove 20 passes through the transducer 14, . In particular, the second value 54 is less than the first value 52. That is, the transducer element 44 supplies a voltage 50 that is less than when passed by the tooth 18 as it passes by the groove 20. The transducer wheel gap 26 is defined by the groove 30 such that the output signal 46 is assigned to the transducer wheel gap 26 and a third value 56 having a different magnitude than the second value 54 . The third value 56 is less than the second value 54. [ That is, the transducer element 44 supplies a voltage 50 that is smaller than when passed by the groove 20 as it is passed by the transducer wheel gap 26 with the groove 30. The smaller voltage value enables a clear identification of the transducer wheel gap 26.

10 sensor device
12 rotating member
14 Transducer
16 Transducer wheel
18 teeth
20 Home
26 Transducer wheel gap
30 Home
44 transducer element
46 Output signal
52 First value
54 Second value

Claims (10)

A sensor device (10) for determining at least one rotational characteristic of a rotary member (12) comprising at least one transducer (14) and a transducer wheel (16) (20) and at least one transducer wheel gap (26), said transducer (14) being configured to generate an output signal (46) Wherein the output signal comprises at least one first value assigned to one of the teeth and a second value assigned to one groove. In the sensor device,
The at least one transducer wheel gap 26 is configured such that the output signal 46 is assigned a third value 56 assigned to the transducer wheel gap 26 and having a different magnitude than the second value 54. [ And the sensor element is formed so as to cover the sensor element. The sensor device according to claim 1, wherein the third value (56) is smaller than the second value (54). 3. A sensor device according to claim 1 or 2, wherein the transducer wheel gap (26) comprises a groove (30) in the transducer wheel (16). The sensor device according to claim 3, wherein the groove (30) has a depth (32) of 0.1 mm to 1.0 mm. 5. Sensor device according to any one of claims 1 to 4, characterized in that the output signal (46) is an analog output signal. 6. A sensor device according to any one of claims 1 to 5, characterized in that the output signal (46) is an electrical output signal (48). 7. Sensor device according to any one of the preceding claims, characterized in that the output signal (46) is a voltage (50). 8. A sensor device according to any one of claims 1 to 7, characterized in that the transducer (14) comprises at least one transducer element (44) for the supply of the output signal (46). The sensor device according to claim 8, wherein the transducer element (26) is a Hall element. 10. The sensor device according to any one of claims 1 to 9, wherein the rotation characteristic is a rotation speed of the rotary member (12).

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