KR100384441B1 - Apparatus for detecting the differential range in an accelerator and clutch pedal for use in a car - Google Patents

Abstract

The present invention relates to a displacement measuring device for measuring the displacement amount of the pedaling force of a pedal used in an automobile. The device of the present invention is attached to a rotating cylindrical rotating body connected to the pedal, a cylindrical permanent magnet in which a plurality of arc-shaped magnetic pieces having two different magnetic poles are bonded to each other within a predetermined rotational displacement angle, and the permanent And a pair of Hall sensors spaced apart from the outer circumferential surface of the magnet to detect the rotational displacement angle according to the pedaling force by the variation of the output voltage value thereof. The cylindrical permanent magnet according to the present invention includes a pair of arc-shaped magnet pieces joined at the same divided angle or two pairs of arc-shaped magnet pieces joined at different split angles, wherein the divided angles of the rotating body It corresponds to the preset rotation angle. In this regard, the pair of Hall sensors are arranged asymmetrically with respect to the magnet pieces having different magnetic poles from each other or symmetrically facing each other with respect to the magnet pieces having different magnetic poles from each other. .

Therefore, the hall sensor generates the maximum value and the minimum value at its output within a predetermined rotational displacement angle, so that the precise amount of rotational displacement of the pedal can be detected.

Description

Displacement measuring device for acceleration and clutch pedal for automobiles {APPARATUS FOR DETECTING THE DIFFERENTIAL RANGE IN AN ACCELERATOR AND CLUTCH PEDAL FOR USE IN A CAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic pedal system using a hall sensor used in an automobile, and more particularly, to an apparatus for detecting a rotation displacement amount corresponding to the pedal effort of an automobile accelerator pedal or a clutch pedal using a hall sensor.

In general, when the driver presses the accelerator pedal to accelerate the vehicle, the throttle valve, which is the gateway of the engine intake system, opens, supplying a lot of air to the engine, and at the same time, the throttle lever operates the fuel injection pump by the spring force. Many fuels are intended to be supplied to the engine.

Electronic accelerator pedal system using the above-described principle is equipped with a displacement angle measuring device having a position sensor in the operation direction of the accelerator pedal to detect the operating angle of the accelerator pedal to generate an electrical signal, according to the operating angle of the accelerator pedal ECU By controlling the opening and closing degree of the throttle valve by a control unit such as (Electonic Control Unit), it is possible to control the amount of air supplied to the engine and the amount of fuel supplied by the fuel injection pump.

Currently, the displacement angle measuring apparatus of various pedals used in automobiles uses a permanent magnet as a rotating body generating a displacement angle, and at this time, the strength of the magnetic field according to the displacement is induced by the hall element using a hall element. It is common to measure the degree of rotation angle by measuring. Most rotational displacement detection and linear movement distance detection require linear characteristics within the range in which measurement is required, and measurement within a specific angle is required. However, due to the characteristics of the Hall element, its output value shows the maximum and minimum in the same magnet pole and the value is repeated at the position where the magnet pole changes. Therefore, one magnet pole should be larger than the path to be measured. In this case, there is a limit to using the maximum output range of the Hall element.

Therefore, an object of the present invention is to provide a displacement detection device of a pedal such that the sensor output value of the hall sensor is within the maximum angle that can measure the rotational angle according to the pedaling force used in the motor vehicle from minimum to maximum. .

According to the present invention for achieving the above object, a displacement measuring device for measuring the amount of displacement of the pedaling force of the pedal used in the motor vehicle comprises: a cylindrical rotor rotating by a key groove connected to the pedal; A cylindrical permanent magnet attached to the rotating body and having a plurality of circular arc-shaped magnet pieces joined to each other so that the strength of the magnetic force within the displacement angle of the rotating body has a maximum and a minimum value; It is arranged on the outer circumferential surface of the permanent magnet, characterized in that it comprises a pair of Hall sensors for detecting the rotational displacement angle according to the pedal effort of the pedal by the variation of the output voltage value.

1 is a schematic diagram of an electronic accelerator pedal system used in the present invention,

Figures 2a, 2b and 2c is a plan view of a displacement measuring device according to the present invention, respectively, a side cross-sectional view as seen from line B-B 'and a side cross-sectional view as seen from line C-C',

3A, 3B and 3C are views showing the arrangement relationship between the permanent magnet and the hall sensor in the displacement measuring device according to the present invention;

4 is a circuit configuration diagram of a displacement measuring device;

5A to 5C are graphs showing the relationship between the output of the Hall sensor and the displacement angle, respectively.

<Description of the symbols for the main parts of the drawings>

2: displacement measuring device 14: key groove

10, 20: case 30: cylindrical rotating body

50: permanent magnet 60, 62: Hall sensor

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

Referring to FIG. 1, a schematic configuration of a schematic diagram of a typical electronic accelerator pedal system is shown.

As shown, the electronic accelerator pedal device is equipped with a displacement angle measuring device 2 in the operating direction of the accelerator pedal 1 to detect an operating angle of the accelerator pedal 2 to generate an electrical signal. The position sensor of the displacement angle measuring device 2 is electrically connected to an electronic control unit (ECU) 3 so that when the operation signal of the accelerator pedal 1 is input, the electric motor 4 is controlled through a predetermined signal processing procedure. Will output a signal. The electric motor 4 is connected to the electronic control unit 3 and is operated by an electric motor control signal for the operation angle of the accelerator pedal 1. The throttle valve 5 may adjust the opening and closing degree by the rotational force transmitted from the electric motor 4 to adjust the amount of air supplied to the engine and the amount of fuel supplied by the fuel injection pump.

Figure 2 is a cross-sectional view of the displacement angle measuring device of the vehicle pedal according to the invention shown in FIG.

As shown in Figure 2, the displacement measurement device of the acceleration and clutch pedal for the vehicle of the present invention is a cylindrical rotating body in the upper case 10, lower case 20, upper case 10 and lower case 20. (30). The upper case 10 and the lower case 20 are made of an injection molded product using a resin having a magnetic shielding component as an outer case of the cylindrical rotating body 30, and the upper and lower cases 10 and 20 are external moisture. And other impurities are sealed by the O-ring 12 using a Viton material to prevent penetration of the impurities into the rotor 30.

The cylindrical rotor 30 is connected to the pedal arm portion (not shown) of the outer pedal 1 (see FIG. 1) in the hollow inner portion formed by the upper and lower cases 10 and 20 so that the pedal arm portion is centered on the hinge point. It is configured to rotate together when rotating. The cylindrical rotor 30 has a key groove 14 connected to the arm of the pedal 1 to rotate the rotor in an upper portion of the center thereof, and when the cylinder rotor 30 is rotated in conjunction with the pedal 1, a predetermined angle It has a disk-shaped flange 32 configured to rotate by.

In addition, the displacement measuring device (2) is a pair of cylindrical permanent magnets 50 attached to the rear surface of the flange 32 of the cylindrical rotor 30 and spaced apart from the outer peripheral surface of the cylindrical permanent magnets 50 Hall sensors 60 and 62, PCB 40 on which Hall sensors 60 and 62 are mounted, and cylindrical rotor 30 on which permanent magnet 50 is mounted, are spatially separated and rotated from external vibration. It further includes a cap 34 which protects the 30 and supports the PCB 40 to protect the hall sensor 60 and the cylindrical permanent magnet 50.

According to the invention, the cylindrical rotor 30 is configured to rotate by a predetermined displacement angle, for example 75 ° ± 10 ° or 180 ° ± 10 ° by the control of the flange 32, which is a hall sensor 60, 62) is a reference for setting the split magnetic pole of the permanent magnet 50 so as to generate the minimum output value and the maximum output value within the displacement angle.

Referring now to FIG. 3, a more detailed configuration of the cylindrical permanent magnet 50 and the hall sensor 60 is shown, in which the cylindrical permanent magnet 50 has a strength of magnetic force within a predetermined displacement angle A. FIG. A plurality of magnet pieces having different magnetic poles (i.e., magnetized to the N pole and the S pole) to have the maximum and the minimum value have a bonded shape.

The cylindrical permanent magnet 50 according to the embodiment of the present invention shown in FIG. 3A includes a pair of arc-shaped magnet pieces 51 and 52 having different magnetic poles, that is, N and S poles, respectively. The pair of arc-shaped magnet pieces 51 and 52 are joined at the same diameter and same division angle. That is, the pair of arc-shaped magnet pieces 51 and 52 form one magnet pole within an arc angle of 180 degrees.

The cylindrical permanent magnet 50 according to another embodiment of the present invention shown in FIG. 3B includes four or two pairs of arc-shaped magnet pieces 53, 54, 55, 56 having an N pole and an S pole. Each pair of the two pairs of arc-shaped magnet pieces 53, 54, 55, 56 are joined at two different dividing angles, i.e., 150 deg. 10 deg. More specifically, the pair of arc-shaped magnet pieces 53 and 54 are joined to form an arc angle of 150 ° ± 10 °, and each form one magnetic pole within an arc angle of 75 ° ± 10 °. The other pair of bonded arc-shaped magnet pieces 55 and 56 are joined to form an arc angle of 210 ° ± 10 °, each forming one magnetic pole within an arc angle of 105 ° ± 10 °.

The cylindrical permanent magnet 50 according to another embodiment of the present invention shown in FIG. 3C includes four or two pairs of arc-shaped magnet pieces 71, 72, 73, and 74 having an N pole and an S pole. . Each pair of the two pairs of arc-shaped magnet pieces 71, 72, 73, 74 are joined at two different dividing angles, that is, 170 ° ± 5 °, 190 ° ± 10 °, with the same diameter. More specifically, the pair of arc-shaped magnet pieces 71 and 73 are joined to each other to form an arc angle of 170 ° ± 5 °, and each form one magnetic pole within an arc angle of 85 ° ± 5 °. . The other pair of bonded arc-shaped magnet pieces 72 and 74 are joined to each other to form an arc angle of 190 ° ± 5 °, and each form one magnetic pole within an arc angle of 95 ° ± 5 °.

The pair of hall sensors 60 and 62 perform a function of detecting the rotational displacement angle of the cylindrical permanent magnet 50 of the rotating body 30 according to the pedaling force of the pedal 1 by the variation of its output voltage value. , Is disposed at a slight separation distance to the outer edge of the cylindrical permanent magnet (50). Typically, the hall sensor, for example, the hall sensor 60 has a characteristic of generating an intermediate value at the junction where the N pole and the S pole meet, and outputting lower than the intermediate value when going to the S pole side (or the N pole side). And the N pole side (or S pole side) is operated to generate an output value larger than the median, and the other Hall sensor 62 produces an inversely symmetrical output value.

Therefore, the hall sensors 60, 62 should have their outputs generate minimum and maximum values within the rotatable displacement angle A range of the permanent magnet 50, and also cause each hall sensor to produce an output that is anti-symmetric. For this purpose, the Hall sensors 60, 62 shown in FIG. 3A are disposed in symmetrical positions facing each other with respect to the magnet pieces 51, 52 having different magnetic poles at an angle of 180 °, and shown in FIG. 3B. The hall sensors 60, 62 are disposed in an asymmetrical position with respect to the magnet pieces 53, 54 having different magnetic poles from each other at an angle of 75 ° ± 10 °, and the hall sensors 60, 62 shown in Fig. 3C. Are arranged in an asymmetrical position with respect to the magnet pieces 71 and 72 having the same magnetic poles with each other at an angle of 95 ° ± 5 °.

In addition, the strength of the magnetic force represents a larger value than the inside of the magnet outside, but the outside of the magnet may be affected by the magnetic force outside the sensor. Therefore, external magnetic shielding is necessary to minimize the effect at the point of measurement of the sensors 60 and 62 from external magnetic forces other than the cylindrical magnet 50. To this end, the separation distance between the permanent magnet 50 and the sensors 60 and 62 should be the same and can be arranged in close proximity to minimize the influence of magnetic forces from the outside.

Referring to Fig. 5, there is shown a graph showing the relationship between the output of the hall sensor and the displacement measurement angle. Fig. 5A shows a waveform diagram of the output value generated by the Hall sensor when the displacement measuring angle A each needs to be smaller than the magnetic pole, that is, the dividing angle, and Fig. 5B shows the displacement measuring angle A required than the magnetic pole. The waveform diagram of the output value produced by the hall sensor in the large case is shown. Finally, FIG. 5C shows a waveform diagram of the output value generated by the Hall sensor when the displacement measuring angle A and the magnetic pole are the same as in FIGS. 4A, 4B and 4C.

Referring to FIG. 4, there is shown a circuit configuration for controlling the valve in accordance with the voltage values output from the hall sensors 60 and 62 in response to the pedal in conjunction with FIG.

The first hall sensor 60 outputs a voltage value corresponding to the displacement angle according to the rotation of the rotor 30 by the pedal's follow-up. The output voltage value of the first hall sensor 60 is applied to the comparator circuit 68 as a comparison input terminal. The comparator circuit 68 generates a comparison signal corresponding to the displacement angle of the rotating body by comparing the voltage value input to the comparison input terminal with the reference voltage applied through the reference terminal. This comparison signal is applied to the control unit 3, which in turn controls the operation of the valve.

Although the displacement measuring device is described with reference to an accelerator pedal in a preferred embodiment of the present invention, it should be understood that the present invention is not limited to the accelerator pedal, but is applicable to a pedal system used in an automobile, for example, a clutch pedal system. .

As described above, since the hall sensor generates the maximum value and the minimum value at its output within a predetermined rotational displacement angle, accurate detection of the rotational displacement amount of the pedal is possible.

Claims (8)

In the displacement measuring device for measuring the amount of displacement of the pedaling force of the vehicle, A cylindrical rotary body rotating by a key groove connected to the pedal; A cylindrical permanent magnet attached to the rotating body and having a plurality of arc-shaped magnet pieces joined to each other such that magnetic poles having different magnetic poles have a maximum and minimum value within a displacement angle of the rotating body; A pair of displacements according to the pedaling force of the pedal are detected by a change in the output voltage value, and a pair of the spacers is spaced apart from the outer circumferential surface of the permanent magnet at a position where the output generates a minimum value and a maximum value within the displacement angle range. Displacement measuring device of a pedal system of a vehicle comprising a Hall sensor. 2. The pedal system of claim 1, wherein the cylindrical permanent magnet has a pair of arc-shaped magnet pieces joined at the same dividing angle, and the dividing angle corresponds to the displacement angle of the rotating body. Displacement measuring device. The pedal of claim 1, wherein the cylindrical permanent magnet includes two pairs of arc-shaped magnet pieces joined at different split angles, the split angles corresponding to displacement angles of the rotating body. Displacement measuring device of the system. 3. An apparatus for measuring displacement amount of a pedal system of a vehicle according to claim 2, wherein said pair of hall sensors are arranged symmetrically facing said division angle with respect to the magnet pieces having different magnetic poles from each other. 4. The magnetic sensor of claim 3, wherein the pair of hall sensors have different magnetic poles from each other. Displacement measuring device for a pedal system of a vehicle, characterized in that arranged asymmetrically with respect to the pair of magnet pieces in the divided angle. 4. The magnetic sensor of claim 3, wherein the pair of hall sensors each have the same magnetic pole. Displacement measuring device for a pedal system of a vehicle, characterized in that arranged asymmetrically with respect to the pair of magnet pieces in the divided angle. The method of claim 1, wherein the pair of Hall sensors are each disposed in close proximity to the outer surface of the permanent magnet in order to minimize the influence of the magnetic force at the measuring point of the sensor from the magnetic force outside the cylindrical magnet. Displacement measurement device of the pedal system of the car. 2. An apparatus for measuring displacement amount of a pedal system of a vehicle according to claim 1, wherein said rotating body has a disk shaped flange configured to rotate said rotating body by said displacement angle.