KR100622125B1 - Wheel steering sensor assembly - Google Patents

Abstract

The present invention relates to a steering angle sensor assembly for measuring a steering angle, by forming a screw gear to correspond to each other on the outer peripheral surface of the column shaft and the inner peripheral surface of the movable member coupled to the outside of the column shaft, according to the rotation of the column shaft By moving the moving member back and forth, the sensor detects the movement of the moving member relates to a steering angle sensor assembly, characterized in that for measuring the absolute steering angle.

Steering Angle, Column Shaft, Linear Hall Sensor

Description

 Steering angle sensor assembly {Wheel steering sensor assembly}

1 is a schematic view of a conventional steering angle sensor assembly.

Figure 2 is a side view of the steering angle sensor assembly according to the present invention.

Figure 3 is a view from above of the steering angle sensor assembly according to the present invention.

FIG. 4 illustrates a state in which FIG. 2 is cut in the AA direction.

* Description of the main parts of the drawings *

10: steering wheel 20: column shaft

21: first screw gear 30: column tube

31: sensor mounting part 51: linear hall sensor

52: moving member 53: permanent magnet

54: Home 55: Guide

55a: stopper

The present invention relates to a steering angle sensor assembly for measuring a steering angle, by forming a screw gear to correspond to each other on the outer peripheral surface of the column shaft and the inner peripheral surface of the movable member coupled to the outside of the column shaft, according to the rotation of the column shaft By moving the moving member back and forth, the sensor detects the movement of the moving member relates to a steering angle sensor assembly, characterized in that for measuring the absolute steering angle.

The steering device refers to a device for manipulating the direction of movement of a vehicle by changing wheel movement, and includes various components such as a steering angle sensor assembly.

The steering angle sensor assembly measures the rotation angle or the rotational angular velocity of the steering wheel based on the straight position of the driving vehicle, and provides the ECU with information about the measured value.

1 briefly illustrates one type of conventional absolute steering angle sensor assembly 40. The sensor assembly 40 is mounted between the column shaft 20 and the steering wheel 10 to measure the absolute steering angle of the steering wheel 10, the operation principle is as follows.

First, when the driver rotates the steering column shaft 20 by rotating the steering wheel 10, two steering shaft gears (not shown) spaced apart from each other and directly coupled to the column shaft 20 rotate, and the steering shaft gear ( Not shown) rotates two sensor gears (not shown) contained in the sensor assembly, so that the potentiometer 41 connected to each of the sensor gears is operated. At this time, the two sensor gears coupled to the potentiometers 41 have different gear ratios to detect a multi turn of the steering wheel. The detected value is transmitted to the ECU.

The configuration of the steering angle sensor assembly as described above corresponds to a known technique widely used, and the steering angle sensor using a potentiometer is disclosed in Korean Patent Laid-Open Publication Nos. 10-1995-0026759 and 10-2002-0047922. As disclosed through, a detailed description thereof will be omitted.

Such a conventional steering angle sensor assembly has to be designed to have a rigid structure because the potentiometer is susceptible to vibration, and there is a problem in that manufacturing cost increases when the design focus is on the rigid structure. Therefore, in low cost EPS systems, it is difficult to use a steering angle sensor assembly in which the potentiometer is configured so that it is not affected by vibration.

In the conventional steering angle sensor assembly, there was a sensor that measures the relative steering angle and corrects the absolute angle.In the case of such sensor assembly, when the ignition is turned off, the information about the steering angle disappears and the steering wheel is rotated to the left or right to some extent after the ignition is turned on. There was a disadvantage of being able to detect angles.

In order to solve the above problems, an object of the present invention is to provide a steering angle sensor assembly capable of measuring an accurate absolute steering angle with a simple configuration.

The present invention is a column shaft is rotated by the rotation of the steering wheel, the first screw gear is formed on the outer peripheral surface to achieve the above object; A column tube located outside the column shaft; A guide coupled to the inside of the column tube; A second screw gear formed on an inner circumferential surface thereof and coupled to an outer side of the first screw gear of the column shaft to limit rotation by the guide; A sensor coupled to the inside of the column tube; It is characterized by including.

More preferably, the moving member is coupled to the permanent magnet, the sensor is a linear Hall sensor, characterized in that the stopper for preventing the movement of the moving member is coupled to both ends of the rotation axis direction of the guide do.

Hereinafter, with reference to the embodiment of the present invention shown in the accompanying drawings will be described.

2 is a side view of the steering angle sensor of the present invention, FIG. 3 is a view from above, and FIG. 4 is a view of FIG. 2 taken along AA.

The steering wheel 10 is coupled to the end of the column shaft 20. The column shaft 20 and the steering wheel 10 are coupled to rotate about the same axis, and a screw gear 21 is formed on the outer circumferential surface of the column shaft 20 over a predetermined period.

A column tube 30 is installed outside the column shaft 20, and the sensor mounting portion 31 is formed to protrude outward from the column tube 30. A sensor is coupled to the sensor mounting portion 31 inside the column tube 30. The sensor serves to sense the approach or distance of the moving member, which will be described later, and a distance measurable sensor should be used, preferably a linear hall sensor.

The moving member 52 is coupled to the column tube 30 so as to be slidable through the guide 55.

The moving member 52 is preferably formed in a hollow circle as shown in Figure 4, the inner peripheral surface of the second screw gear (not shown) corresponding to the first screw gear 21 of the column shaft Is formed.

It is preferable that the permanent magnet 53 is coupled to the movable member 52, and a groove 54 to which the guide 55 is coupled is formed on the outer circumferential surface of the movable member 52.

The guide 55 is coupled to the inside of the column tube 30, and a stopper 55a is formed at both ends to prevent the moving member from being separated as shown in FIG. 3.

Hereinafter will be described the operation of the steering angle sensor assembly of the present invention having the configuration as described above.

First, when the driver rotates the steering wheel 10 and the column shaft 20 rotates, the first screw gear 21 formed on the column shaft 20 also rotates with the second force inside the moving member 52. It is transmitted to a screw gear (not shown). By the way, since the moving member 52 is limited to the rotation by the guide 55 coupled to the inside of the column tube 30, as shown in Figure 4, it will eventually move along the rotation axis in the direction of the arrow of FIG.

When the movable member 52 moves, the permanent magnet 53 coupled to the movable member 52 moves as well, and the linear hall sensor 51 and the permanent magnet 53 fixed inside the column tube 30 are moved. The magnetic field strength of the permanent magnets 53 detected from the linear hall sensor 51 is changed according to the distance between the < RTI ID = 0.0 > Therefore, when the intensity of the magnetic field is detected using the linear hall sensor 51 which outputs the intensity of the magnetic field as an analog value, the absolute position of the steering wheel 10 can be detected.

In the above, the case where the linear hall sensor detects the magnetic field of the permanent magnet has been described, but any sensor capable of detecting the distance to the moving member may be used, and if the distance can be detected by the sensor, the movement must be performed. The permanent magnet does not have to be coupled to the member.

A brief summary of the effects of the invention mentioned above is as follows.

First, the steering angle sensor assembly can be constructed at a very low cost.

Second, since the configuration is simple and there is no configuration to be affected by impact or vibration, it is suitable for application to automotive applications because it has strong durability and environmental resistance.

Third, when the linear Hall sensor is used, the output is in analog form, so the ECU can measure the value directly through a simple low pass filter, for convenience.

Fourth, since the absolute angle is measured directly, there is an advantage that the reliability is higher than the sensor for measuring and correcting the existing relative angle.

Claims (3)

delete A column shaft rotated by the rotation of the steering wheel and having a first screw gear formed on an outer circumferential surface thereof; A column tube located outside the column shaft; A guide coupled to the inside of the column tube; A second screw gear formed on an inner circumferential surface thereof and coupled to an outer side of the first screw gear of the column shaft to limit rotation by the guide; A sensor coupled to the inside of the column tube; The permanent magnet is coupled to the moving member, the sensor is a steering angle sensor assembly, characterized in that the linear Hall sensor. The steering angle sensor assembly of claim 2, wherein a stopper is coupled to both ends of the rotation axis in the guide to prevent separation of the movable member.

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