KR101822722B1 - Detection Device and Method of Vehicle Cam Position - Google Patents

Detection Device and Method of Vehicle Cam Position Download PDF

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Publication number
KR101822722B1
KR101822722B1 KR1020150187706A KR20150187706A KR101822722B1 KR 101822722 B1 KR101822722 B1 KR 101822722B1 KR 1020150187706 A KR1020150187706 A KR 1020150187706A KR 20150187706 A KR20150187706 A KR 20150187706A KR 101822722 B1 KR101822722 B1 KR 101822722B1
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South Korea
Prior art keywords
hall sensor
detection signal
cam
signal
absolute value
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KR1020150187706A
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Korean (ko)
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KR20170077630A (en
Inventor
이승태
정승균
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주식회사 현대케피코
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/25—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts
    • G01D5/252—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts a combination of conductors or channels
    • G01D5/2525—Selecting one or more conductors or channels from a plurality of conductors or channels, e.g. by closing contacts a combination of conductors or channels with magnetically controlled switches, e.g. by movement of a magnet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2820/00—Details on specific features characterising valve gear arrangements
    • F01L2820/04—Sensors
    • F01L2820/041—Camshafts position or phase sensors

Abstract

The present invention relates to an apparatus and method for detecting a cam position of a vehicle capable of detecting an initial position and a rotational position of the cam of the vehicle. A cam position detecting device for a vehicle according to an embodiment of the present invention includes a first hall sensor and a second hall sensor disposed on a cam wheel, a permanent magnet for providing a magnetic field to the first hall sensor and the second hall sensor, And a signal processing unit for generating a position signal of the cam based on the detection signals inputted to the first hall sensor and the second hall sensor. The signal processing unit of the present invention compares the detection signal of the first hall sensor and the detection signal of the second hall sensor to detect an initial position and a rotation position of the cam.

Description

Technical Field [0001] The present invention relates to a cam position detecting apparatus and method,

The present invention relates to an apparatus and method for detecting a cam position of a vehicle, and more particularly, to an apparatus and method for detecting a cam position of a vehicle capable of detecting an initial position and a rotational position of the cam of the vehicle.

The cam sensor of the vehicle measures the position of the piston with respect to the top dead center. Based on the sensing signal from the cam sensor, an electronic control unit (ECU) determines engine operating conditions to control the fuel injection timing for each cylinder .

1 is a view schematically showing an apparatus for detecting the rotation angle of a camshaft of a vehicle according to the prior art.

Referring to FIG. 1, a camshaft rotation angle detecting device for a vehicle according to the related art is provided at an end of a camshaft 3 for opening and closing a valve 2. As shown in FIG. The camshaft rotation angle detecting device includes a plate-type sensing braid 10 rotating at the same time as the camshaft 3 and having protrusions 12 at both ends thereof, (20) installed at a position orthogonal to the direction of the cam shaft (3) and sensing the rotational position of the cam shaft (3).

Type sensor 20 is formed so as to be spaced apart at regular intervals and the plate-type sensing braid 10 rotates integrally with the camshaft 3 so that the projection 12 is inserted between the intervals of the sensor 20, As shown in FIG. Sensing data of the rotational position of the camshaft 3 detected through the camshaft rotational angle detecting device is provided to the ECU 30. [ The intake and exhaust valves 2 are opened and closed while the camshaft 3 rotates and the respective strokes of the cylinder 1 are changed according to the timing of the valve 2. The fuel injection timing is monitored in accordance with each stroke change and fuel injection is performed in the cylinder 1 at an accurate timing.

When the camshaft 3 rotates, the plate-shaped sensing braid 10 rotates integrally with the camshaft 3, and the position of the projection 12 of the plate-shaped sensing braid is aligned with the rotation angle of the camshaft 3 Will vary. At this time, the blade insertion type sensor 20 senses the passing state of the projecting portion 12, and grasps the rotational position of the camshaft 3.

The blade inserting type sensor 20 can be inserted into the cylinder 1 through the protrusion 12 of the plate type sensing braid 10 because the opening / closing of the valve 2 and the piston position in the cylinder 1 are changed according to the rotational position of the camshaft 3. [ ) Can be grasped. Therefore, the detection result of the braid inserting sensor 20 is input to the ECU 30, and the ECU 30 controls the fuel injection device by determining the fuel injection timing according to the input result.

The apparatus for detecting the rotation angle of the camshaft of the vehicle according to the related art has a high manufacturing cost and requires a mounting operation in which the protruding portion 12 of the plate-type sensing braid is passed through between the ends of the sensor 20 for inserting the braid. Further, the camshaft rotation angle detecting device of the vehicle according to the related art has a problem that the rotation angle detecting performance is different according to the rotation speed of the camshaft of the vehicle. In particular, although the rotation angle when the camshaft rotates can be detected, there is a problem that the initial position of the cam is difficult to detect.

Korea Patent No.: 1998-0026448 (Camshaft rotation angle sensor of engine)

The inventors of the present application recognize the above-mentioned problems and propose the following technical problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cam position detecting apparatus for a vehicle which is low in manufacturing cost and easy to install.

It is still another object of the present invention to provide an apparatus and method for detecting a cam position of a vehicle that can detect an initial position of the cam.

It is still another object of the present invention to provide an apparatus and method for detecting a cam position of a vehicle that can detect the rotational position (rotational angle and rotational speed) of the cam.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided an apparatus for detecting a cam position of a vehicle, including: a first hall sensor and a second hall sensor disposed on a cam wheel; And a signal processing unit for generating a position signal of the cam based on the detection signal input to the first hall sensor and the second hall sensor. The signal processing unit of the present invention compares the detection signal of the first hall sensor and the detection signal of the second hall sensor to detect an initial position and a rotation position of the cam.

A cam position detecting device for a vehicle according to an embodiment of the present invention is characterized in that a first width from the first hall sensor to the second hall sensor is a valley of the cam wheel or a tooth of the cam wheel Is less than or equal to the second width.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention is characterized in that when the detection signal of the first hall sensor and the detection signal of the second hall sensor are smaller than the switching reference value, 1 Hall sensor and the second hall sensor. Then, the first signal is outputted from the position signal of the cam.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention is characterized in that when the detection signal of the first hall sensor and the detection signal of the second hall sensor are larger than the switching reference value, The second hall sensor, and the second hall sensor. Then, the second signal is outputted by the position signal of the cam.

The signal processing section of the vehicle cam position detecting device according to the embodiment of the present invention compares the absolute value of the difference between the detection signal of the first hall sensor and the detection signal of the second hall sensor with an absolute value reference value. Then, the position signal of the cam is generated based on a result of comparison between the absolute value of the difference and the absolute value reference value.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention may be configured such that the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the first hall sensor is the detection signal of the second hall sensor The first signal is generated by the position signal of the cam.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention may be configured such that the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the second hall sensor is the detection signal of the first hall sensor The second signal is generated by the position signal of the cam.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention may be configured such that the absolute value of the difference is larger than the absolute value reference value and the detection signal of the second hall sensor is the detection signal of the first hall sensor The first signal is generated by the position signal of the cam.

The signal processing unit of the vehicle cam position detecting device according to the embodiment of the present invention may be configured such that the absolute value of the difference is larger than the absolute value reference value and the detection signal of the first hall sensor is the detection signal of the second hall sensor The second signal is generated by the position signal of the cam.

The signal processing section of the cam position detecting device of the vehicle according to the embodiment of the present invention outputs the position signal of the cam to an electronic control unit (ECU).

According to another aspect of the present invention, there is provided a method of detecting a cam position of a vehicle, the method comprising: detecting a position of the vehicle using the cam position detecting device of the vehicle including the first hall sensor, the second hall sensor, The cam position detecting method includes detecting an initial position and a rotational position of the cam based on the detection signal of the first hall sensor and the detection signal of the second hall sensor. And generating a position signal of the cam and outputting the position signal to an electronic control unit (ECU).

The method of detecting a cam position of a vehicle according to an embodiment of the present invention is characterized in that when the detection signal of the first hall sensor and the detection signal of the second hall sensor are smaller than the switching reference value, It is determined that the second hall sensor is located corresponding to the second hall sensor. Then, the first signal is outputted from the position signal of the cam.

The method of detecting a cam position of a vehicle according to an embodiment of the present invention is characterized in that when the detection signal of the first hall sensor and the detection signal of the second hall sensor are larger than the switching reference value, It is judged that it is located corresponding to the second hall sensor. Then, the second signal is outputted by the position signal of the cam.

A method for detecting a cam position of a vehicle according to an embodiment of the present invention compares an absolute value of a difference between a detection signal of the first hall sensor and a detection signal of the second hall sensor with an absolute value reference value. Then, the position signal of the cam is generated based on a result of comparison between the absolute value of the difference and the absolute value reference value.

The method of detecting a cam position of a vehicle according to an embodiment of the present invention is characterized in that when the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor, As shown in FIG.

The method of detecting a cam position of a vehicle according to an embodiment of the present invention is characterized in that when the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor, To generate a second signal.

In the method of detecting a cam position of a vehicle according to an embodiment of the present invention, if the absolute value of the difference is larger than the absolute value reference value and the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor, As shown in FIG.

The method of detecting a cam position of a vehicle according to an embodiment of the present invention is characterized in that when the absolute value of the difference is larger than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor, To generate a second signal.

An apparatus and method for detecting a cam position of a vehicle according to an embodiment of the present invention can detect an initial position and a rotational position of a cam based on detection signals of two hall sensors.

The present invention according to the embodiment can provide a cam position detecting device for a vehicle having a low manufacturing cost and easy installation.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view schematically showing an apparatus for detecting the rotation angle of a camshaft of a vehicle according to the prior art.
2 is a view showing an apparatus for detecting a cam position of a vehicle according to an embodiment of the present invention.
3 is a view showing a method of detecting the position of the cam when a valley of the cam wheel is positioned so as to correspond to the first hall sensor and the second hall sensor.
4 is a view showing a method of detecting the position of the cam when the tooth of the cam wheel is positioned to correspond to the first hall sensor and the second hall sensor.
5 is a view showing a method of detecting the position of the cam when the tooth of the cam wheel is positioned so as to correspond to the first hall sensor and the valley of the cam wheel is positioned to correspond to the second hall sensor.
6 is a view showing a method of detecting the position of the cam when the valley of the cam wheel is positioned so as to correspond to the first hall sensor and the tooth of the cam wheel is positioned to correspond to the second hall sensor.
7 is a view showing a method of detecting an initial position and a rotational position of the cam by using the first hall sensor and the second hall sensor.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain parts that are described as being "below" other parts are described as being "above " other parts. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The ECU disposed in the vehicle determines the timing of injecting the fuel into each of the plurality of cylinders based on the sensing data input from the cam sensor so that the piston position of each of the plurality of cylinders constituted in the engine must be accurately detected. In particular, it is necessary not only to sense the rotation angle and the number of revolutions of the cam but also to accurately sense the initial position of the cam, so that the fuel can be injected into each of the plurality of cylinders at an accurate timing.

2 is a view showing an apparatus for detecting a cam position of a vehicle according to an embodiment of the present invention.

Referring to FIG. 2, the cam position detecting apparatus 100 includes a first hall sensor 110, a second hall sensor 120, a signal processor 130, and a permanent magnet 140, Permanent magnet).

The first Hall sensor 110 and the second Hall sensor 120 of the present invention are sensors for sensing a magnetic field change amount of a magnetic body by using a Hall effect. The first hall sensor 110 and the second hall sensor 120 ) Can be compared to detect the position of the cam. The first hall sensor 110 and the second hall sensor 120 are arranged at regular intervals.

The distance between the first hall sensor 110 and the second hall sensor 120 is wider than the width W2 of the tooth 152 of the cam wheel 150 or the tooth 154 of the cam wheel 150 , There is no problem in detecting the rotation position (rotation angle and the number of revolutions) of the cam, but the accuracy of detecting the initial position of the cam can be lowered. The first width W1 from the first hall sensor 110 to the second hall sensor 120 is greater than the first width W1 between the valleys 152 and 152 of the cam wheel 150. In order to accurately detect the initial position of the cam wheel 150, the first Hall sensor 110 and the second Hall sensor 120 are disposed such that the second width W2 of the tooth 154 of the cam wheel 150 or the tooth 154 of the cam wheel 150 is smaller than the second width W2 of the teeth 154. [ However, the present invention is not limited to this, and the first width W1 from the first hall sensor 110 to the second hall sensor 120, the valley 152 of the cam wheel 150, The first hall sensor 110 and the second hall sensor 120 may be disposed such that the second width W2 of the tooth 154 is the same.

The magnetic field generated in the permanent magnet 140 is supplied to the first hall sensor 110 and the second hall sensor 120 and the first hall sensor 110 and the second hall sensor 120 generate a magnetic field intensity Intensity).

When the cam wheel 150 rotates, the current when the valley 152 of the cam wheel 150 is positioned and the tooth 154 of the cam wheel 150 corresponding to the first hall sensor 110 The current when it is located changes, and this current is converted into voltage. Similarly, when the cam wheel 150 rotates, the current when the valley 152 of the cam wheel 150 is positioned so as to correspond to the second hall sensor 120 and the current when the valley of the cam wheel 150 is positioned on the teeth 154, tooth current is changed, and this current is converted into a voltage.

The rotational position of the cam wheel 150 can be detected through the voltage change of the first hall sensor 110 and the voltage of the second hall sensor 120 (detection signal) due to the rotation of the cam wheel. The voltages generated by the first hall sensor 110 and the second hall sensor 120 are supplied to the signal processing unit 130 as detection signals.

The signal processing unit 130 amplifies the detection signals supplied from the first hall sensor 110 and the second hall sensor 120 and outputs a detection signal of the first hall sensor 110 and a detection signal of the second hall sensor 120 And generates a position signal of the cam wheel 150 based on the detection signal. The position signal of the cam wheel 150 generated in the signal processing unit 130 is supplied to the ECU 200. The ECU 200 controls the fuel injection timing of each cylinder according to the position signal of the cam wheel 150 And controls the fuel injection device.

3 is a view showing a method of detecting the position of the cam when a valley of the cam wheel is positioned so as to correspond to the first hall sensor and the second hall sensor.

3, the initial position and the position after the rotation of the cam wheel 150 can be detected through the detection signals V1 and V2 of the first hall sensor 110 and the second hall sensor 120. [ The signal processing unit 130 compares the detection signal V1 of the first hall sensor 110 with the switching reference value. If the detection signal V1 of the first hall sensor 110 is smaller than the switching reference value, it is determined that the valley 152 of the cam wheel is positioned to correspond to the first hall sensor 110. [

The signal processing unit 130 compares the detection signal V2 of the second Hall sensor 120 with the switching reference value. If the detection signal V2 of the second hall sensor 120 is smaller than the switching reference value, it is determined that the valley 152 of the cam wheel is positioned to correspond to the second hall sensor 120. [ When the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are smaller than the switching reference value, a low signal is generated as a result of detecting the position of the cam , And outputs a low signal as a cam position signal.

However, if the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are smaller than the switching reference value, ) Signal, and outputs a high signal as a position signal of the cam.

4 is a view showing a method of detecting the position of the cam when the tooth of the cam wheel is positioned to correspond to the first hall sensor and the second hall sensor.

Referring to FIG. 4, the initial position and the position of the cam wheel 150 after rotation can be detected through the detection signals V1 and V2 of the first hall sensor 110 and the second hall sensor 120. The signal processing unit 130 compares the detection signal V1 of the first hall sensor 110 with the switching reference value. If the detection signal V1 of the first hall sensor 110 is larger than the switching reference value, it is determined that the cam wheel tooth 154 is positioned to correspond to the first hall sensor 110. [

The signal processing unit 130 compares the detection signal V2 of the second Hall sensor 120 with the switching reference value. If the detection signal V2 of the second hall sensor 120 is larger than the switching reference value, it is determined that the cam wheel tooth 154 is positioned to correspond to the second hall sensor 120. [ If the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are greater than the switching reference value, a high signal is generated as a result of the position detection of the cam, And outputs a high signal as a cam position signal.

If the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are larger than the switching reference value, And output a low signal as a position signal of the cam.

Here, the switching reference value distinguishes the valley 152 of the cam wheel from the teeth 154 of the cam wheel, and detects that the valley 152 of the cam wheel and the teeth 154 of the cam wheel are switched by the rotation of the cam . The first voltage value due to the magnetic field when the first hall sensor 110 and the second hall sensor 120 are positioned to correspond to the valleys 152 of the cam wheel is smaller than the switching reference value. On the contrary, the second voltage value due to the magnetic field when the first hall sensor 110 and the second hall sensor 120 are positioned to correspond to the teeth 154 of the cam wheel is larger than the switching reference value. Thus, the initial position of the cam can be detected by comparing the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 with the switching reference value.

The initial position and the rotational position of the cam can be detected after a predetermined number (N) of signals are outputted from the first hall sensor 110 and the second hall sensor 120 by rotating the cam for a predetermined time. If a low value and a high value of the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are outputted in a tact relationship, And it is possible to detect how much the cam has rotated by counting the number of alternating the low value and the high value of the two detection signals. That is, not only the initial position of the cam, but also the position when the cam rotates can be detected.

5 is a view showing a method of detecting the position of the cam when the tooth of the cam wheel is positioned so as to correspond to the first hall sensor and the valley of the cam wheel is positioned to correspond to the second hall sensor.

5, the initial position and the position of the cam wheel 150 after the rotation can be detected through the detection signals V1 and V2 of the first hall sensor 110 and the second hall sensor 120. [ The signal processing unit 130 compares the detection signal V1 of the first hall sensor 110 with the switching reference value. If the detection signal V1 of the first hall sensor 110 is larger than the switching reference value, it is determined that the cam wheel tooth 154 is positioned to correspond to the first hall sensor 110. [

The signal processing unit 130 compares the detection signal V2 of the second Hall sensor 120 with the switching reference value. If the detection signal V2 of the second hall sensor 120 is smaller than the switching reference value, it is determined that the valley 152 of the cam wheel is positioned to correspond to the second hall sensor 120. [

6 is a view showing a method of detecting the position of the cam when the valley of the cam wheel is positioned so as to correspond to the first hall sensor and the tooth of the cam wheel is positioned to correspond to the second hall sensor.

Referring to FIG. 6, the signal processor 130 compares the detection signal V1 of the first hall sensor 110 with a switching reference value. If the detection signal V1 of the first hall sensor 110 is smaller than the switching reference value, it is determined that the valley 152 of the cam wheel is positioned to correspond to the first hall sensor 110. [

The signal processing unit 130 compares the detection signal V2 of the second Hall sensor 120 with the switching reference value. If the detection signal V2 of the second hall sensor 120 is larger than the switching reference value, it is determined that the cam wheel tooth 154 is positioned to correspond to the second hall sensor 120. [

The position when the cam rotates and stops may be random so that the first hall sensor 110 and the second hall sensor 120 are always positioned to correspond to the valleys 152 of the cam wheel, As shown in FIG. 5 and 6, when the detection signal of the first hall sensor 110 is different from the detection signal V2 of the second hall sensor 120, the first hall sensor 110 and the second hall sensor 120, It can be determined that the hall sensor 120 is located at the boundary between the valley 152 of the cam wheel and the teeth 154 of the cam wheel.

7 is a view showing a method of detecting an initial position and a rotational position of the cam by using the first hall sensor and the second hall sensor.

5 to 7, a description will be made of a detection signal output method when the absolute value of the difference DV between the two detection signals V1 and V2 is smaller than the absolute value reference value.

The signal processing unit 130 calculates the difference DV between the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 and outputs the two detection signals V1 and V2 ) Is compared with the absolute value reference value. The absolute value reference value means the difference between the average value of the positive peak (P peak) and the negative peak (N peak) and the switching level at which actual switching occurs. Therefore, in the figure, only the upper section can be used based on the average value of the positive peak (P peak) and the negative peak (N peak).

For example, when the absolute value of the difference DV between the two detection signals V1 and V2 is smaller than the absolute value reference value and the detection signal V1 of the first hall sensor 110 is smaller than the absolute value reference value 2 hole sensor 120, it generates a high signal as a result of detecting the position of the cam. Then, a high signal is outputted to the ECU as a position signal of the cam.

As another example, when the absolute value of the difference DV between the two detection signals V1 and V2 is smaller than the absolute value reference value and the detection signal V2 of the second hall sensor 120 1 hall sensor 110, it generates a low signal as a result of detecting the position of the cam. Then, a low signal is outputted to the ECU as a position signal of the cam.

Next, a detection signal output method in the case where the absolute value of the difference DV between the two detection signals V1 and V2 is greater than the absolute value reference value will be described with reference to FIGS. 5 to 7. FIG.

The signal processing unit 130 calculates the difference DV between the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 and outputs the two detection signals V1 and V2 ) Is compared with the absolute value reference value.

For example, when the absolute value of the difference DV between the two detection signals V1 and V2 is greater than the absolute value reference value and the detection signal V1 of the first Hall sensor 110 2 hole sensor 120, it generates a high signal as a result of detecting the position of the cam. Then, a high signal is outputted to the ECU as a position signal of the cam.

As another example, when the absolute value of the difference DV between the two detection signals V1 and V2 is larger than the absolute value reference value and the detection signal V2 of the second hall sensor 120 is equal to 1 hall sensor 110, it generates a low signal as a result of detecting the position of the cam. Then, a low signal is outputted to the ECU as a position signal of the cam.

The absolute value reference value is set for quickly detecting the initial position of the cam. The positive peak (P peak) and the negative peak (N peak) of the output signals of the first hall sensor 110 and the second hall sensor 120 ) To 60% to 80%. The absolute value reference value is a reference after the detection signal V1 of the first hall sensor 110 and the detection signal V2 of the second hall sensor 120 are outputted as a certain number (N) The phase difference does not occur.

If the low and high values of the detection signal of the first hall sensor 110 and the detection signal of the second hall sensor 120 are outputted in a symmetrical manner within a predetermined time, have. It is possible to detect not only the initial position of the cam but also the position when the cam has rotated by comparing the absolute value of the difference DV between the two detection signals V1 and V2 with the absolute value reference value. It is also possible to detect how much the cam has rotated by counting the alternating number of the low value and the high value of the two detection signals V1 and V2.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Cam position detecting device
110: first hall sensor
120: second hall sensor
130: Signal processor
140: permanent magnet
150: cam wheel
152: Cam wheel valley
154: tooth of cam wheel
200: Electronic control unit (ECU)
V1: detection signal of the first hall sensor
V2: detection signal of the second hall sensor
VD: difference between the detection signal of the first hall sensor and the detection signal of the second hall sensor

Claims (14)

A first hall sensor and a second hall sensor disposed on the cam wheel;
A permanent magnet for providing a magnetic field to the first hall sensor and the second hall sensor; And
And a signal processing unit for generating a position signal of the cam based on the detection signals input to the first hall sensor and the second hall sensor,
Wherein the signal processing unit detects an initial position and a rotational position of the cam by comparing the detection signal of the first hall sensor and the detection signal of the second hall sensor,
Wherein a first width from the first hall sensor to the second hall sensor is smaller than or equal to a second width of a valley of the cam wheel or a tooth of the cam wheel. delete The signal processing apparatus according to claim 1,
If the detection signal of the first hall sensor and the detection signal of the second hall sensor are smaller than the switching reference value, it is determined that the crest of the cam wheel is located corresponding to the first hall sensor and the second hall sensor, And outputs the first signal with the position signal. The signal processing apparatus according to claim 1,
If the detection signal of the first hall sensor and the detection signal of the second hall sensor are larger than the switching reference value, it is determined that the value of the cam wheel is located corresponding to the first hall sensor and the second hall sensor, And outputs a second signal as a signal. The signal processing apparatus according to claim 1,
And comparing the absolute value of the difference between the detection signal of the first hall sensor and the detection signal of the second hall sensor with an absolute value reference value,
And generates a position signal of the cam based on a result of comparison between the absolute value of the difference and the absolute value reference value. The signal processing apparatus according to claim 5,
If the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor,
When the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor while the absolute value of the difference is smaller than the absolute value reference value, Device. The signal processing apparatus according to claim 5,
If the absolute value of the difference is larger than the absolute value reference value and the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor,
When the absolute value of the difference is larger than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor, Device. 8. The method according to any one of claims 3 to 7,
And the signal processing unit outputs the position signal of the cam to an electronic control unit (ECU). A method of detecting a cam position of a vehicle using a cam position detecting device of a vehicle including a first hall sensor, a second hall sensor, a permanent magnet, and a signal processing section,
Wherein a first width from the first hall sensor to the second hall sensor is less than or equal to a second width of a tooth of a cam wheel valley or cam wheel,
Detecting an initial position and a rotational position of the cam based on the detection signal of the first hall sensor and the detection signal of the second hall sensor; And
And generating a position signal of the cam and outputting the position signal to an electronic control unit (ECU). 10. The method of claim 9,
If the detection signal of the first hall sensor and the detection signal of the second hall sensor are smaller than the switching reference value, it is determined that the crest of the cam wheel is located corresponding to the first hall sensor and the second hall sensor, And outputting the first signal with the position signal. 10. The method of claim 9,
If the detection signal of the first hall sensor and the detection signal of the second hall sensor are larger than the switching reference value, it is determined that the value of the cam wheel is located corresponding to the first hall sensor and the second hall sensor, And outputting the second signal as a signal. 10. The method of claim 9,
Wherein the absolute value of the difference between the detection signal of the first hall sensor and the detection signal of the second hall sensor is compared with the absolute value reference value, A method of detecting a cam position of a vehicle that generates a signal. 13. The method of claim 12,
If the absolute value of the difference is smaller than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor,
When the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor while the absolute value of the difference is smaller than the absolute value reference value, Way. 13. The method of claim 12,
If the absolute value of the difference is larger than the absolute value reference value and the detection signal of the second hall sensor is larger than the detection signal of the first hall sensor,
When the absolute value of the difference is larger than the absolute value reference value and the detection signal of the first hall sensor is larger than the detection signal of the second hall sensor, Way.
KR1020150187706A 2015-12-28 2015-12-28 Detection Device and Method of Vehicle Cam Position KR101822722B1 (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US5084674A (en) 1988-10-13 1992-01-28 Siemens Aktiengesellschaft Circuit configuration having a pair of multi-Hall generator Hall sensors and high pass filter for contactless detection of the rpm of a rotating gear wheel
US7535215B2 (en) 2004-04-07 2009-05-19 Infineon Technologies Ag Apparatus and method for the determination of a direction of an object

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5084674A (en) 1988-10-13 1992-01-28 Siemens Aktiengesellschaft Circuit configuration having a pair of multi-Hall generator Hall sensors and high pass filter for contactless detection of the rpm of a rotating gear wheel
US7535215B2 (en) 2004-04-07 2009-05-19 Infineon Technologies Ag Apparatus and method for the determination of a direction of an object

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