KR20100123482A - Detection apparatus of steering angle in vehicle - Google Patents

Abstract

PURPOSE: A steering-angle detecting device of a vehicle is provided to enable the absolute rotating angle of a main gear to be detected since the rotating number of the main gear is detected through a sensor, which outputs magnetic voltage according to the rotating magnetic field of a permanent magnet, which is installed on an intermittent gear. CONSTITUTION: A steering-angle detecting device of a vehicle comprises a coil(18), a sensor(42) and a controller(70). If a main gear rotates, the coil is overlapped with a disc, which is integrally formed with the main gear and has a different width, and outputs the induced voltage. The sensor outputs the magnetic voltage according to the rotating magnetic field of a permanent magnet(32), which is installed on an intermittent gear, which rotates with the main gear. The controller detects the absolute rotating angle of the main gear based on the induced voltage and the magnetic voltage. The detecting device further comprises a power supply unit(80), which supplies the power to the coil, the sensor and the controller.

Description

Detection apparatus of steering angle in vehicle

The present invention relates to a steering angle detection device for a vehicle, and more particularly, to a steering angle detection device for a vehicle in which the absolute rotation angle of the vehicle main gear can be easily detected.

The steering angle detection device of a vehicle is a device that detects a rotation amount (angle) and a rotation speed (angular speed) of the steering wheel when steering the steering wheel.

In general, the steering angle detection device is an important device that can determine the steering intention of the driver by detecting the movement of the steering wheel. The steering angle detection signal output from the steering angle detection device may be used as a control signal for various units such as an anti-look brake system (ABS), an electronics stability program (ESP), and an electronics power steering (EPS).

The steering angle detector can be classified into optical SAS and AMR (Anisotropic Magneto Resistance) SAS according to the signal measurement method.

The optical SAS is composed of a plurality of light emitting parts, a light receiving part, a rotating disk composed of a plurality of slits, and the like, and performs signal processing by an encoding method.

AMR SAS extracts the angle by measuring the phase difference of the magnetic field, which has the advantage of good resolution.

Recently, research on a method of detecting the absolute rotation angle of the main gear by detecting the rotation angle of the main gear when the main gear rotates through the steering angle detection device of the vehicle.

An object of the present invention is to provide a steering angle detecting apparatus for a vehicle in which the absolute rotation angle of the vehicle main gear can be easily detected.

The steering angle detection apparatus for a vehicle of the present invention includes a coil for outputting an induced voltage by overlapping a disc having a different width integrated with the main gear when the main gear rotates, and a permanent magnet installed in an intermittent gear interlocking with the main gear. And a controller for outputting a magnetic field voltage according to the rotating magnetic field, and a controller for detecting an absolute rotation angle of the main gear based on the induced voltage and the magnetic field voltage.

The steering angle detection device of the vehicle of the present invention detects the absolute angle of the main gear through a coil outputting an induced voltage according to the overlapping interview with the disc having a different width in the main gear, and according to the rotating magnetic field of the permanent magnet installed in the intermittent gear. By detecting the rotational speed of the main gear through the sensor that outputs the magnetic field voltage, it is possible to detect the absolute rotational angle of the main gear, thereby correcting the error of the rotational error, the absolute rotational angle, and the accurate absolute rotational angle. There is this.

Hereinafter, a steering angle detecting apparatus for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating an apparatus for detecting a steering angle of a vehicle according to a first embodiment of the present invention.

Referring to FIG. 1, the steering angle detector of the vehicle includes a main gear 10, a sub gear 20, an intermittent gear 30, a printed circuit board (PCB) 40, a connector 50, and a case 60. Include.

The main gear 10 is coupled to a steering column (not shown) which rotates integrally with a steering wheel (not shown) of the vehicle and is installed to interlock with each other.

In addition, the main gear 10 is connected to at least one side and includes a disk 12.

The disk 12 is formed to have a different width, is integrally installed with the main gear 10, the main gear 10 is rotated when the main gear 10 rotates.

In addition, the main gear 10 further includes coils 14 and 16 for outputting an induced voltage according to an overlapping interview when the disk 12 rotates.

The sub gear 20 is interlocked when the main gear 10 rotates so that the intermittent gear 30 is rotated.

The intermittent gear 30 has a permanent magnet 32 is installed in the center portion, and is interlocked when the main gear 10 rotates.

The printed circuit board 40 is positioned below the intermittent gear 30 and includes a sensor 42 that outputs a magnetic field voltage for a rotating magnetic field when the permanent magnet 32 rotates.

Here, the sensor 42 is disposed close to the lower portion of the permanent magnet 32, and outputs the magnetic field voltage.

The connector 50 is connected by contact pins 52 provided for supplying power to the printed circuit board 40 from the outside.

The case 60 includes an up cover 62 and a down cover 64 which accommodate the main gear 10, the sub gear 20, the intermittent gear 30, the printed circuit board 40, and the connector 50. Include.

2 is a functional block diagram illustrating an apparatus for detecting a steering angle of a vehicle according to a first embodiment of the present invention.

Referring to FIG. 2, the steering angle detecting apparatus of the vehicle includes a coil 18 and a main which overlap with a disk 12 having a different width integrated with the main gear 10 to output an induced voltage when the main gear 10 rotates. On the basis of the sensor 42 for outputting a magnetic field voltage in accordance with the rotating magnetic field of the permanent magnet 32 installed in the intermittent gear 30 which interlocks with the gear 10, the induction voltage and the magnetic field voltage, the main gear ( The control unit 70 detects the absolute rotation angle of the 10 and the coil 18, the sensor 42 and the power supply unit 80 for supplying driving power to the control unit 70.

Here, the disk 12 is formed to have a different width between the inner side and the outer side.

That is, the coil 18 includes a first coil 14 formed on the first side of the disk 12 and a second coil 16 formed on the second side.

In this embodiment, the coil 18 has been described as including two coils, but the number is not limited thereto.

Here, each of the first and second coils 14 and 16 overlaps the upper and lower portions of the disk 12 when the disk 12 rotates, and outputs first and second induced voltages according to the overlapping area of the disk 12.

That is, the first and second coils 14 and 16 generate the first and second induced voltages with a predetermined time difference, and transmit the first and second induced voltages to the controller 70.

The sensor 42 outputs the magnetic field voltage for the rotating magnetic field in a predetermined phase range according to the polarity of the permanent magnet 32.

The sensor 42 is a magnetic resistance sensor, and the predetermined phase range is 180 degrees.

Therefore, the sensor 42 outputs the magnetic field voltage by varying the phase every 180 degrees.

The controller 70 calculates an absolute rotation angle of the main gear 10 through the first and second induced voltages and the magnetic field voltage.

That is, the control unit 70 may output the first and second induction voltages and the magnetic field voltages from the amplification filter unit 72 and the amplification filter unit 72 to amplify and filter the first and second induction voltages and the magnetic field voltages. The control unit 76 converts the digital value into a digital value, and calculates the absolute rotation angle of the main gear 10 by arithmetic processing with a setting program.

The amplification filter unit 72 removes noise (noise) included in the first and second induced voltages and the magnetic field voltage and amplifies the noise to a predetermined magnitude.

The control unit 74 samples the signals for the first and second induced voltages and the magnetic field voltages output from the amplifying filter unit 72, converts the signals to the digital values, and arithmetic processes them with the setting program to calculate the absolute rotation angle. Calculate.

FIG. 3 is a graph showing gear displacement of the main gear shown in FIG. 2, FIG. 4 is a graph showing gear displacement of the intermittent gear shown in FIG. 2, and FIG. 5 is an absolute rotation with respect to the gear displacement shown in FIGS. 3 and 4. A graph showing angles.

Referring to FIG. 3, (a) is a graph showing the first induced voltage p1 measured by the first coil 14 when the main gear 10 rotates, and (b) shows the time when the main gear 10 rotates. Is a graph showing the second induced voltage p2 measured by the second coil 16, and (c) represents the rotation angle of the main gear 10 calculated through the first and second induced voltages p1 and p2. It is a graph.

That is, it can be seen that (a) and (b) represent sinusoidal waveforms having the same period.

And when (a) and (b) are combined, it turns out that a predetermined phase difference arises. That is, it can be seen that the first induced voltage p1 is 90 ° out of phase delay than the second induced voltage p2.

Here, the controller 70 calculates the rotation angle of the main gear 10 by calculating the first and second induced voltages p1 and p2 by a set program, that is, a tangent function.

That is, (c) calculates the first and second induced voltages p1 and p2 as the difference voltages of the first and second induced voltages p1 and p2 at 180 ° periods.

Here, when the difference voltage between the first and second induced voltages p1 and p2 has a negative value, 180 ° is added to represent the value.

Therefore, (c) is shown as a graph rising in a 180 ° period, it can be seen that the control unit 70 is caused by the tangent function.

Referring to FIG. 4, the magnetic field voltage output from the sensor 42 with respect to the rotating magnetic field of the permanent magnet 32 rotating at a 180 ° period when the intermittent gear 30 is rotated is shown.

That is, the sensor 42 outputs the magnetic field voltage having a linear characteristic that increases with a 180 ° period.

Therefore, the control unit 70 confirms that the intermittent gear 30 is 360 ° in one rotation by the magnetic field voltage, and thus grasps the rotation speed of the intermittent gear 30.

The controller 70 may calculate the rotation speed of the main gear 10 according to the gear ratio of the main gear 10 and the intermittent gear 30.

Referring to FIG. 5, the absolute rotation angle calculated by the rotation angle and the rotation speed of the main gear 10 calculated by FIGS. 3 and 4 is shown.

That is, (a) is a graph shown by 180 degree period, (b) is a graph which shows the angle according to rotation speed.

Here, (a) and (b) show the absolute rotation angle of the main gear 10 calculated by the control part 70, and will mainly use the graph shown in (b).

That is, the controller 70 calculates a graph in which a rotation angle is added according to the rotation speed.

Therefore, the controller 70 may calculate the rotation position, that is, the absolute rotation angle, when the main gear 10 rotates.

The steering angle detection apparatus for a vehicle according to the present invention calculates the rotation angle of the main gear by using two coils, calculates the rotation speed of the main gear through the sensor, and calculates the absolute rotation angle of the main gear.

Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

1 is a perspective view illustrating an apparatus for detecting a steering angle of a vehicle according to a first embodiment of the present invention.

2 is a functional block diagram illustrating an apparatus for detecting a steering angle of a vehicle according to a first embodiment of the present invention.

3 is a graph showing the gear displacement of the main gear shown in FIG.

4 is a graph showing the gear displacement of the intermittent gear shown in FIG.

FIG. 5 is a graph showing an absolute rotation angle with respect to the gear displacement shown in FIGS. 3 and 4.

Claims (8)

A coil which, when the main gear rotates, overlaps with a disc having a different width integrated with the main gear to output an induced voltage; A sensor for outputting a magnetic field voltage according to a rotating magnetic field of the permanent magnet installed in the intermittent gear interlocked with the main gear; And And a control unit for detecting an absolute rotation angle of the main gear based on the induced voltage and the magnetic field voltage. The method of claim 1, And a power supply unit for supplying driving power to the coil, the sensor, and the control unit. The method of claim 1, wherein the coil, At least two steering angle detection apparatus for a vehicle. The method of claim 1, wherein the coil, A first coil installed at a first side of the disk to output a first induced voltage; And And a second coil installed at a second side of the disk to output a second induced voltage. The method of claim 1, wherein the sensor, And a magnetoresistive sensor for outputting the magnetic field voltage with respect to the rotating magnetic field of the permanent magnet. The method of claim 5, wherein the sensor, And outputting the magnetic field voltage with respect to the rotating magnetic field while the intermittent gear rotates at regular intervals at 180 degree intervals. The method of claim 1, wherein the control unit, And a rotation angle of the main gear based on the induced voltage, a rotation speed of the main gear based on the magnetic field voltage, and detecting the absolute rotation angle. The method of claim 7, wherein the control unit, An amplifying filter unit amplifying and filtering the induced voltage and the magnetic field voltage; And And a control unit for converting the induction voltage and the magnetic field voltage output from the amplification filter unit into digital values and calculating the absolute rotation angle of the main gear by arithmetic processing with a setting program.

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