KR20170079688A - Intergrated sensor and method for detecting position of rotating object - Google Patents

Intergrated sensor and method for detecting position of rotating object Download PDF

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KR20170079688A
KR20170079688A KR1020150190501A KR20150190501A KR20170079688A KR 20170079688 A KR20170079688 A KR 20170079688A KR 1020150190501 A KR1020150190501 A KR 1020150190501A KR 20150190501 A KR20150190501 A KR 20150190501A KR 20170079688 A KR20170079688 A KR 20170079688A
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sensor
switching level
unit
magnetic flux
output
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KR1020150190501A
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Korean (ko)
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KR101817976B1 (en
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권우영
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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
    • 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
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • 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
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/002—Automatic recalibration
    • 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
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/02—Indicating direction only, e.g. by weather vane
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L2013/11—Sensors for variable valve timing
    • F01L2013/111—Camshafts position or phase
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L2013/11—Sensors for variable valve timing
    • F01L2013/113—Sensors for variable valve timing crankshafts position
    • 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
    • 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
    • F01L2820/042—Crankshafts position

Abstract

The present invention relates to an integrated position sensing sensor for a rotating body and a method for sensing the position of the rotating body using the integrated position sensing sensor. In order to accomplish the above and other objects, an integrated position sensor of a rotating body which integrates the functions of a cam sensor and a crank sensor with one sensor of the present invention includes a first element unit receiving power through an input terminal, A second element portion; A switching level setting unit for calculating a switching level based on the magnetic flux distribution output through the first element unit and the second element unit; And a comparator for controlling an output voltage through the output terminal by comparing a magnetic flux distribution output through the first and second element units with a switching level, wherein the switching level setting unit sets an initial switching level TPO True Power On) switching level as a switching level.

Description

TECHNICAL FIELD [0001] The present invention relates to an integrated position sensor and a method for detecting an integrated position of a rotating body,

The present invention relates to an integrated position sensor for a rotating body and a method for detecting the position of a rotating body using the integrated position sensing sensor. More particularly, the present invention relates to an integrated position sensing sensor for a rotating body that implements the functions of a cam sensor and a crank sensor, And a position sensing method of the rotating body using the integrated position sensing sensor.

Conventional rotator detecting sensors are formed by using a Hall or MR (Magneto Resistive) effect. That is, the conventional rotating body detection sensor is turned on or off by comparing the magnetic flux density value that varies according to the tooth shape or the polarity of rotation with one reference value.

Such a rotating body detection sensor is widely used in the automobile field. Specifically, in the automotive field, such a rotation detecting sensor uses a sensor (for example, a cam sensor and a crank sensor) for measuring the position of the rotating body.

The cam sensor measures the absolute value of the magnetic flux and operates ON or OFF in comparison with the input reference value (hereinafter referred to as TPO switching level) for quick response in the initial rotation. Then, the cam sensor simultaneously corrects the TPO switching level by detecting the maximum-minimum value of the magnetic flux density for the purpose of improving the accuracy, and ON or OFF operation is performed based on the calibrated calibration switching level. Here, the cam sensor can implement a TPO (True Power On) function that can check the state (Tooth / Valley) of the target wheel even when the engine is stopped (0 RPM). The cam sensor includes a single Hall element at the center of the sensor, and through the Hall element, a twist insensitive mounting (TIM) function capable of measuring the speed of the cam regardless of the direction of rotation of the target wheel There are advantages to be able to.

On the other hand, the cam sensor has a low measurable RPM (max. 5,000 RPM) due to the absolute flux density measurement, high measurement accuracy due to absolute measurement is not high, low repeatability due to Hall effect for TPO function, This is an impossible problem.

The crank sensor measures the relative amount of magnetic flux and operates ON or OFF based on the center value (Zero Switching) of magnetic flux difference. Also, the crank sensor can provide rotational direction information and PWM type information using the phase difference between the magnetic flux at the center of the sensor. Here, unlike the cam sensor, the crank sensor measures the relative amount of magnetic flux, and it can measure the rotation speed (for example, 12,000 RPM) higher than that of the cam sensor. In addition, the crank sensor can improve the measurement accuracy according to the absolute amount measurement, improve the repeatability by applying the GMR (Giant Magneto Resistance) effect, and measure the rotation direction of the target wheel.

On the other hand, the crank sensor can not perform the TPO function for confirming the state (Tooth / Valley) of the target wheel even in the stop state (0 RPM) according to the learning need for a certain period of time, There is a problem that the TIM function is also impossible.

Therefore, in the cam sensor and the crank sensor, the above problems can be solved, and a demand for a new sensor having the advantages of each sensor is increasing.

Korea Public Utility Model No. 1999-0038090 (Name: rotation sensor and position sensor structure)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an integrated position sensing sensor for a rotating body incorporating only the advantages of the sensors to overcome the disadvantages of conventional cam sensors and crank sensors, and a method for sensing the position of a rotating body using the same.

In order to solve the above-mentioned problems, an integrated position sensor of a rotating body, which integrates the functions of a cam sensor and a crank sensor with one sensor of the present invention, receives power through an input terminal, A first element portion and a second element portion; A switching level setting unit for calculating a switching level based on the magnetic flux distribution output through the first element unit and the second element unit; And a comparator for controlling an output voltage through the output terminal by comparing a magnetic flux distribution output through the first and second element units with a switching level, wherein the switching level setting unit sets an initial switching level TPO True Power On) switching level as a switching level.

Further, the integrated position detection sensor of the present invention further includes a learning completion determination unit for determining whether predetermined learning has been performed based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit, When the learning is completed, the switching level can be calculated based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit.

The switching level setting unit may set the switching level by multiplying the maximum peak of the magnetic flux distribution output through the first element unit by a predetermined percentage when the preset learning is in progress.

Further, the integrated position detection sensor of the present invention determines whether or not the cam sensor signal output based on the magnetic flux distribution sensed through the first element unit is synchronized with the crank sensor signal output based on the magnetic flux distribution sensed through the second element unit Thereby detecting an abnormality of the integrated position detection sensor.

Further, the second element portion may be composed of a plurality of second elements, and the second elements may be arranged to surround the first sensor.

The integrated position detection sensor of the present invention may further include a rotation direction detection unit that detects a rotation direction of the rotating body based on a magnetic flux distribution output from each of the plurality of second elements.

Further, the first element portion may be constituted by a Hall element.

Further, the second element portion may be composed of a Hall element or an MR (Magneto Resistance) element.

According to an aspect of the present invention, there is provided a method of detecting the position of a rotating body through an integrated position sensing sensor that integrates functions of a cam sensor and a crank sensor with one sensor of the present invention, Calculating a switching level based on a distribution of a magnetic flux output through the first element unit and the second element unit, which are supplied with power through the first element unit and detect the rotation of the rotating body; And controlling an output voltage through an output terminal of the integrated position sensing sensor by comparing a magnetic flux distribution output through the first element portion and the second element portion with a switching level by a comparator, (TPO) switching level, which is an initial switching level, at the switching level when the vehicle is started.

In addition, the method of detecting the position of the rotating body of the present invention may further include confirming whether or not predetermined learning has been performed based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit by the learning completion determining unit , The step of calculating the switching level may be based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit when the preset learning is completed.

The step of calculating the switching level may be performed by multiplying the maximum peak of the magnetic flux distribution output through the first element section by a predetermined percentage when the predetermined learning is in progress.

According to another aspect of the present invention, there is provided a method for detecting the position of a rotating body, comprising the steps of: outputting, based on a cam sensor signal output based on a magnetic flux distribution sensed through a first element unit and a magnetic flux distribution sensed through a second element unit, And determining whether or not the integrated position sensor is in an abnormal state by determining whether the crank sensor signal is synchronized with the integrated position sensor.

Further, the second element portion may be composed of a plurality of second elements, and the second elements may be arranged to surround the first sensor.

The method may further include detecting the rotational direction of the rotating body based on the magnetic flux distribution output from the plurality of second elements by the rotating direction detecting unit.

Further, the first element portion may be constituted by a Hall element.

Further, the second element portion may be composed of a Hall element or an MR (Magneto Resistance) element.

According to the integrated position sensing sensor of the present invention and the position sensing method using the integrated position sensing sensor of the present invention, by merely taking advantage of advantages other than the above-described disadvantages of the cam sensor and the crank sensor, Can be integrated into one.

Further, according to the integrated position sensing sensor of the present invention and the position sensing method using the integrated position sensing sensor of the present invention, it is possible to perform two sensor functions with only one sensor, and mass production is possible, .

1 is a conceptual diagram of an integrated position sensing sensor according to an embodiment of the present invention.
2 is a block diagram of an integrated position sensing sensor according to an embodiment of the present invention.
3 is a flowchart illustrating a method of diagnosing an integrated position sensor according to an exemplary embodiment of the present invention.
4 is a graph for explaining an output waveform through the cam sensor.
5 is a graph for explaining an output waveform through the crank sensor.
6 is a graph for explaining a waveform output through the cam sensor and the crank sensor.
7 is a conceptual diagram of a cam sensor according to the prior art.
8 and 9 are conceptual diagrams of a conventional crank sensor.
10 is a graph showing an output waveform through a crank sensor according to the prior art.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Prior to the description of the integrated position detection sensor 100 according to an embodiment of the present invention, an output waveform method through the cam sensor and the crank sensor will be described first. See FIG. 4 is a graph for explaining an output waveform through the cam sensor.

As described above, the cam sensor generates an output signal by measuring the absolute amount of magnetic flux using the Hall element located therein and comparing the flux distribution with the TPO switching level. Here, the TPO switching level is calibrated by learning every cycle, and can be set to a value of a predetermined percentage (50% to 80%) at the peak of the magnetic flux distribution. Accordingly, the cam sensor is output based on the switching level which is variably changed as shown in Fig. However, although the cam sensor can measure the magnetic flux density even when the engine is stopped (i.e., 0 rpm), its accuracy is low and there is a problem that the rotational direction (forward or reverse) of the target wheel can not be measured.

In the case of the cam sensor 20, one Hall element 21 is disposed at the center of the sensor (see FIG. 7). Accordingly, the cam sensor 20 can perform the TIM function and the TPO function as described above. A description of the crank sensors 30 and 40 will now be made with reference to Figs. 5, 8 and 9. FIG. 5 is a graph for explaining an output waveform through the crank sensors 30 and 40, and FIGS. 8 and 9 are conceptual diagrams for explaining the structure of the crank sensor. 8 is a conceptual diagram of a crank sensor 30 capable of detecting only one direction of a rotating body, and FIG. 9 is a conceptual diagram of a crank sensor 40 capable of detecting both directions of the rotating body.

The crank sensor may comprise a plurality of Hall elements or Giant Magneto Resistance (GMR) elements. That is, in the case of the crank sensor 30 for unidirectional detection, it may be configured to include two elements 21 and 22, and in the case of the crank sensor 40 for bidirectional detection, three elements 31, 32, 33). Here, the element applied to the crank sensor may be a Hall element or a GMR element. The crank sensor calculates the relative amount of magnetic flux on the basis of the magnetic flux output from each element and performs ON or OFF output based on the center value (zero crossing) of the difference between the magnetic flux and the magnetic flux. Also, the crank sensor can provide rotational direction information and PWM type information by using the phase difference with the magnetic flux in the center portion. 9 and 10, each of the probes B, C and D senses the absolute amount of magnetic flux density, and the difference in magnetic flux density measured through each probe (i.e., And the difference in magnetic flux density measured through each of these probes can amplify the measurement magnetic flux density by a factor of two.

However, in the case of the crank sensor, since the TPO function is not supported as shown in Fig. 5, time for initial learning is required. In Figure 5, this learning period is shown in the comparison mode, and after learning is shown in the calibration mode. In the case of the crank sensor in this way, there is a problem that the reliability of the output of the sensor drops during learning. Accordingly, the integrated position detection sensor 100 according to an embodiment of the present invention aims to solve the disadvantages of the conventional cam sensor and the crank sensor, and to combine only the advantages to make one sensor.

6. 6 is a graph for explaining a waveform output through the cam sensor and the crank sensor. 6, the first pulse represents the output of the cam sensor, the second pulse represents the output of the crank sensor for the vehicle to which the ISG (Idle Stop and Go) is not applied, and the third pulse represents the output of the crank for the vehicle to which the ISG is applied Indicates the output of the sensor. As shown by the first and second pulses, the output waveforms of the cam sensor and the crank sensor (not used for ISG) themselves are the same or similar, so that it is possible to integrate them into one sensor through phase adjustment or the like. 1 and 2, a description will be given of an integrated position sensing sensor 100 according to an embodiment of the present invention.

1 is a conceptual diagram of an integrated position sensing sensor according to an embodiment of the present invention. 2 is a block diagram of an integrated position sensing sensor according to an embodiment of the present invention. 1, the integrated position detecting sensor 100 according to an embodiment of the present invention may be installed to be spaced apart from the rotating body 10, and may include a rotating body 10 having a toothing portion 11 It is possible to derive a variation amount of the magnetic flux density with the rotation. For this, the integrated position sensing sensor 100 according to an embodiment of the present invention includes a first element part 120, a second element part 130, and a terminal part 110 installed in the body part .

The terminal unit 110 may be configured to include three terminals. Here, reference numeral 111 denotes an input terminal, 112 denotes an output terminal, and 113 denotes a ground terminal.

The first element unit 120 and the second element unit 130 receive power from the input terminal 111 and output a magnetic flux distribution corresponding to the detection when the rotating body is detected. Here, the output through the first element part 120 can be used for the output of the cam sensor, and the output through the first element part 120 and the second element part 130 can be used for the output of the crank sensor have. As will be described below again, the use of the second element part 130 requires learning time, during which the output of the cam sensor through the first element part 120 can be used.

1, the first element part 120 is disposed at the center thereof and the second element part 120 is disposed at the center thereof, And the second element part 130 may be disposed around the second element part 130. [

Specifically, the second element portion 130 may be formed of a plurality of elements, and may be disposed so as to surround the first element portion 120 around the first element portion 120. Here, the first element unit 120 may be a Hall element, and the second element unit 130 may be a Hall element or GMR elements. That is, the first element unit 120 can measure the magnetic flux distribution using the Hall effect, and the second element unit 130 can measure the magnetic flux distribution using the Hall effect, the MR effect, or the GMR effect.

Here, the hole effect for the cam sensor shows a phenomenon that, when a magnetic field is applied perpendicularly to an electric conductor through which a constant current flows, a Hall voltage is formed across the electric conductor in proportion to the intensity of the magnetic field. Accordingly, the Hall element has one hole probe for sensing the intensity of the magnetic flux therein (see FIG. 7). The signal processing of the magnetic flux density caused by the rotation of the target wheel determines the position of the tooth portion, and the signal processing detects the highest and the lowest points of the signal and measures the position of the square wave based on the point between 50% and 80% It is possible to determine the falling and rising positions.

The magnetoresistive (MR) effect shows a phenomenon in which the resistance of the electric conductor changes in proportion to the change in the magnetic field strength when the magnetic field applied horizontally to the electric conductor through which the constant current flows changes. The giant magnetoresistive (GMR) effect shows a method of making a thin ferromagnetic thin film and a non-ferromagnetic thin film layer overlap each other to have a magnetoresistance ratio of several tens% or more in order to amplify the resistance change of the magnetoresistive effect.

The GMR element used in the crank sensor may include three GMR probes (b, c, d) sensing the magnetic flux intensity therein (see FIG. 10). The GMR element measures the position of the tooth portion by signal processing the deviation (velocity signal, bd) of the magnetic flux intensity between two GMR probes generated as the target wheel rotates, and detects the change of the magnetic flux intensity of one GMR probe c) to generate a square wave sensor output as the rotation information of the target wheel. The signal processing method is the same as that of the above-described Hall element.

Now, referring to FIG. 2, a description will be given of the function of the integrated position detection sensor 100 according to an embodiment of the present invention. 2, the integrated position detection sensor 100 includes a terminal unit 110, a first device unit 120, a second device unit 130, a switching level setting unit 140, A comparator 145, a learning completion determination unit 150, a rotation direction detection unit 160, a phase recognition unit 170, and an abnormality diagnosis unit 180. Here, the description of the terminal unit 110, the first element unit 120, and the second element unit 130 is made with reference to FIG. 1, and a further explanation will be omitted.

The integrated position detection sensor 100 according to an embodiment of the present invention further includes a protection circuit part (not shown) and a power stabilization part (not shown) between the input terminal 111 and the element parts 120 and 130 . Here, the protection circuit unit functions to protect the overvoltage, the surge voltage, and the reverse voltage of the power supplied through the input terminal 111. The power stabilizing unit may divide and regulate the supply voltage through the protection circuit unit 121 and supply the regulated voltage to the Hall element, the analog unit, and the digital unit included in the body unit.

In addition, the signals output through the first and second element units 120 and 130 are removed through an amplifier and a filter (not shown), amplified and input to the switching level setting unit 140 .

The switching level setting unit 140 sets the switching level to be used through the comparator 145 in the following description. That is, the integrated position detection sensor 100 of the present invention outputs a control signal for controlling the ON or OFF operation of the transistor (not shown) by comparing the magnetic flux distribution output from the element portion through the comparator 145 and the switching level do. The switching level generated through the switching level setting unit 140 functions as a reference value used in the comparison process. Accordingly, the cam sensor signal is output through the comparator 145, based on the signal output through the first element unit 120, and through the first element unit 120 and the second element unit 130 The crank sensor signal can be transmitted to the outside through the output terminal 112. [

As described above, unlike the crank sensor, the cam sensor has the advantage that the state of the target wheel can be confirmed by using the TPO function using the hall sensor disposed at the center, but it is possible to measure at a relatively low speed as compared with the crank sensor There is a problem of low precision. And, the crank sensor needs a certain time for learning, but it has high accuracy and high speed detection after learning.

Accordingly, the integrated position detection sensor 100 according to an embodiment of the present invention adopts a switching level setting method of the cam sensor in an interval in which an initial learning interval is required in the crank sensor (refer to A portion of FIG. 4) (See part B of FIG. 5) of the crank sensor after the initial learning is completed. That is, the signal output through the first element unit 120 can be used for securing the learning time of the crank sensor described above.

The switching level setting unit 140 sets the switching level based on the magnetic flux distribution output through the first element unit 120 and the second element unit 130, The initial switching level TPO switching level can be set as the switching level. The switching level setting unit 140 may set the switching level according to the completion of learning determined through the learning completion determining unit 150 described below.

That is, when it is determined that the predetermined learning has not yet been completed as a result of the determination made by the learning completion determination unit 150 described below, the switching level setting unit 140 may use the switching level setting unit 140 to update the switching level of the existing cam sensor The maximum peak of the magnetic flux distribution sensed through the first element section is multiplied by a predetermined percentage to set the switching level. The predetermined percentage is preferably about 50% to 80%.

If it is determined through the learning completion determination unit 150 that the learning of the predetermined scheme has been completed, the switching level setting unit 140 sets the maximum value of the magnetic flux distribution output through the second element unit 130 The switching level can be calculated based on the value and the minimum value. Here, the learning represents learning which is a method used in the crank sensor, and the learning method itself may obscure the gist of the present invention, and further explanation will be omitted.

As described above, the learning completion determining unit 150 determines whether or not predetermined learning has been completed. Here, the learning completion determination method performed through the learning completion determination unit 150 may be based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit 130. For example, let it be assumed that the hole probe constituting the first element unit 120 is an A probe, and the probes constituting the second element unit 130 are a B probe, a C probe and a D probe, respectively. Assume that the first element portion 120 is a Hall element and the second element portion 130 is a GMR element.

At this time, the second element unit 130 composed of the GMR elements, that is, the crank sensor unit, requires at least two tooth signal measurements to recognize the largest value among the signal deviations BC / CD / DB of each element need. Here, when the largest value among the signal deviations of the elements is recognized through the second element unit 130, the learning completion determining unit 150 determines that predetermined learning is completed. In this case, the first element unit 120 disposed at the center can be used to set the switching level until the above-described learning is completed because the first element unit 120 is located at the center and can recognize the first signal through the TPO function. That is, in order to compensate for the disadvantage of the GMR element having a limitation in the measurement direction, a Hall element having no limitation in the measurement direction is used.

The integrated position sensing sensor 100 according to an embodiment of the present invention may be configured such that the switching level set by the switching level setting unit 140, the signal output from the first device unit 120, And the second element unit 130, the comparator 145 compares the signals output from the second element unit 130 and generates an output signal for performing the functions of the cam sensor and the crank sensor. That is, the integrated position detection sensor 100 according to an exemplary embodiment of the present invention may output a cam sensor signal for performing a function of the cam sensor and a crank sensor signal for performing a function of the crank sensor.

In addition, the integrated position detection sensor 100 according to an embodiment of the present invention can perform a self-diagnosis function based on the cam sensor signal and the crank sensor signal. Here, the diagnosis function may be performed through the configuration of the abnormality diagnosis unit 180 installed inside or outside the integrated position detection sensor 100 of the present invention.

Before performing the diagnosis through the abnormality diagnosis unit 180, the integrated position detection sensor 100 according to an embodiment of the present invention detects the rotation direction of the rotating body through the rotation direction detection unit 160. [ Here, the rotational direction detecting unit 160 detects the rotational direction of the rotating body based on the magnetic flux distribution output from each of a plurality of Hall elements or a plurality of GMR elements (second elements) included in the second element unit 130 Can be detected. For example, suppose that the second element unit 130 is composed of three GMR elements, and each element is referred to as a first GMR element, a second GMR element, and a third GMR element.

In this case, each of the GMR elements outputs a magnetic flux distribution signal. The rotation direction detector 160 detects a value obtained by subtracting the output of the second GMR element from the output of the first GMR element, a value obtained by subtracting the output of the third GMR element from the output of the second GMR element, And a value obtained by subtracting the output of the first GMR element from the output of the third GMR element. Thereafter, the rotation direction detecting unit 160 detects the direction in which the largest peak, that is, the largest value among the calculated values, is generated in the rotating direction of the rotating body.

The phase recognition unit 170 recognizes the phase of the cam sensor signal output from the first element unit 120 through the comparator 145. [

By using the rotation direction information (composed of the pulse width signal) generated through the rotation direction detection unit 160 and the phase information generated through the phase recognition unit 170, the rotation direction of the rotation body can be accurately grasped. Assuming that the first element portion 120 disposed at the center is an A probe and the probes included in the second element portion 130 surrounding the first element portion 120 are referred to as a B probe, C probe and D probe. Here, it is assumed that the first element portion 120 is a Hall element, and the second element portion 130 is a GMR element.

As described above, the rotational direction can be measured through a plurality of GMR elements, that is, a B probe, a C probe, and a D probe. For example, it is assumed that the signal deviation of B-D among the signal deviations (B-C / C-D / B-D) of the probes of the second element unit 130 is the largest. In this case, it can be seen that the rotating body rotates in the direction from B to D, that is, in the forward direction. At this time, by comparing the B-D signal and the C signal, which is the output of the C probe, more precise measurement of the rotational direction is possible. This is because, in the forward direction, the C signal has a perceptual phase difference with respect to the B-D signal, and in the reverse direction, the C signal advances inversely.

The abnormality diagnosing unit 180 compares the cam sensor signal with the crank sensor signal in consideration of the rotational direction of the rotating body based on the information derived through the rotational direction detecting unit 160 and the phase recognizing unit 170, And diagnoses whether the integrated position detection sensor 100 is abnormal based on the comparison result. As described above with reference to FIG. 6, the signal output through the cam sensor and the signal output through the crank sensor are the same. Accordingly, the abnormality diagnosing unit 180 may detect a crank sensor signal output through the integrated position detecting sensor 100 according to an embodiment of the present invention, a cam sensor signal internally confirmed through the first device unit 120, It is possible to confirm whether or not the integrated position detection sensor is abnormal. 6.

As shown by the fourth and fifth pulses in FIG. 6, the integrated position sensing sensor 100 according to an embodiment of the present invention can implement an output waveform of a crank sensor that varies depending on the ISG mode. When the initial learning is performed, the integrated position detection sensor 100 according to an embodiment of the present invention may control the output through the second element unit 130 and the output through the first element unit 120, And the crank sensor signal are compared with each other. That is, after the initial learning, the sensing signal through the first element unit 120 does not affect the output of the integrated position sensing sensor 100 according to an embodiment of the present invention, It is possible to perform the abnormality diagnosis for the integrated position detection sensor 100 by comparing the detection signal through the second element unit 130 with the detection signal through the second element unit 130 and checking whether the signals are synchronized with each other.

As described above, the integrated position detection sensor 100 according to an exemplary embodiment of the present invention is capable of performing both the functions of the cam sensor and the crank sensor, and collects only the advantages of each sensor. That is, in the integrated position sensing sensor 100 according to the embodiment of the present invention, when measuring the position of the rotating body, a sensor, which is separately used due to a specific function required for each of the camshaft and the crankshaft, Elements, which can be arranged as shown in Fig. 1 and integrated into the learning logic described with reference to Fig. Accordingly, the integrated position detecting sensor 100 according to an embodiment of the present invention can compensate for the disadvantages existing in the cam sensor and the crank sensor, and can reduce the manufacturing cost of the product due to the mass production capability There is an advantage.

3 is a flowchart illustrating a method of diagnosing an integrated position sensor according to an exemplary embodiment of the present invention. Hereinafter, a method of diagnosing an integrated position sensing sensor according to an embodiment of the present invention will be described with reference to FIG. In the following, descriptions overlapping with those described above are omitted.

First, a magnetic flux distribution is output through a first element unit and a second element unit that are supplied with power through an input terminal and sense the rotation of the rotating body (S110). As described above, the first element portion and the second element portion can output the magnetic flux distribution upon detection of the rotating body by using a Hall effect or an MR effect. Here, it is preferable that the first element is a Hall element and the second element portion is a Hall element or a GMR element. Further, as described with reference to Fig. 1, the second element portion may be composed of a plurality of elements, and may be disposed so as to surround the first element portion.

Thereafter, the switching level setting unit sets a switching level (S120). Here, the switching level set in step S120 may be calculated based on the magnetic flux distribution output through the first and second element units. However, it can be achieved by setting the TPO (True Power On) switching level, which is the initial switching level, at the switching level at the initial start of the vehicle.

Thereafter, the output voltage through the output terminal of the integrated position sensing sensor is controlled (S130) by comparing the magnetic flux distribution output through the first element portion and the second element portion with the switching level by the comparator. Specifically, the step S130 is a step of outputting the cam sensor signal and the crank sensor signal by comparing the magnetic flux distribution and the switching level.

Thereafter, the learning completion determining unit determines whether predetermined learning has been performed based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit (S140). As described above, the integrated position detection sensor according to an embodiment of the present invention follows the switching level setting method of the cam sensor before the preset learning for the operation of the crank sensor is completed, and thereafter, the switching level setting of the crank sensor Method. If it is determined in step S140 that the learning is completed, step S120 is performed to control the maximum value and the minimum value of the magnetic flux distribution output through the second element unit. Otherwise, control is passed to step S120, and step S120 is performed by multiplying the maximum peak of the magnetic flux distribution output through the first element part by a predetermined percentage. Since the description has been described in detail above, further explanation is omitted.

In step S150, the rotational direction of the rotor is detected based on the magnetic flux distribution output from each of the plurality of second elements by the rotational direction detecting unit. In step S160, The phase of the cam sensor signal is recognized.

Thereafter, the step of comparing the cam sensor signal with the crank sensor signal in consideration of the rotational direction of the rotating body and the phase of the cam sensor signal, thereby diagnosing the abnormality of the integrated position sensor, is performed (S170). The diagnosis in step S170 is based on whether the two signals are synchronized. If the two signals are not synchronized, it is determined that an abnormality has occurred in the integrated position detection sensor.

Thereafter, a step of determining whether an abnormality has occurred by the abnormality diagnosis unit is performed (S180), and when an abnormality has occurred, the control is transferred to the step S190 to reset the integrated position detection sensor. It is also possible to use a method of notifying the operator through an output unit (not shown). If it is determined in step S180 that an error does not occur, it is transferred to the return block.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: integrated position detection sensor 110: terminal part
111: input terminal 112: output terminal
113: ground terminal 120: first element portion
130: second element unit 140: switching level setting unit
145: comparator 150:
160: rotation direction detecting unit 170: phase recognizing unit
180: abnormality diagnosis unit

Claims (16)

An integrated position detection sensor of a rotating body that integrates the functions of a cam sensor and a crank sensor with one sensor,
A first element unit and a second element unit that are supplied with power through an input terminal and sense the rotation of the rotating body;
A switching level setting unit for calculating a switching level based on the magnetic flux distribution output through the first element unit and the second element unit; And
And a comparator for controlling the output voltage through the output terminal by comparing the flux level output through the first element and the second element with the switching level,
Wherein the switching level setting unit sets the TPO switching level as the switching level, which is an initial switching level, at the start of the vehicle. The method according to claim 1,
Further comprising a learning completion determining unit for determining whether predetermined learning has been performed based on a maximum value and a minimum value of the magnetic flux distribution output through the second element unit,
Wherein the switching level setting unit calculates the switching level based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit when the predetermined learning is completed. 3. The method of claim 2,
Wherein the switching level setting unit sets the switching level by multiplying the maximum peak of the magnetic flux distribution output through the first element unit by a predetermined percentage when the predetermined learning is in progress. The method according to claim 1,
The controller determines whether the cam sensor signal output based on the magnetic flux distribution sensed through the first element unit is synchronized with the crank sensor signal output based on the magnetic flux distribution sensed through the second element unit, Further comprising an abnormality diagnosis unit for diagnosing abnormality of the integrated position sensor. The method according to claim 1,
Wherein the second element part is constituted by a plurality of second elements, and the second elements are arranged to surround the first sensor element. 6. The method of claim 5,
Further comprising a rotation direction detecting unit that detects a rotation direction of the rotating body based on a magnetic flux distribution output from each of the plurality of second elements. The method according to claim 1,
Wherein the first element unit comprises a Hall element. The method according to claim 1,
Wherein the second element unit is composed of a Hall element or an MR (Magneto Resistance) element. A method for detecting the position of a rotating body through an integrated position detecting sensor which integrates the functions of a cam sensor and a crank sensor with one sensor,
Calculating a switching level by a switching level setting unit based on a distribution of a magnetic flux supplied through a first element unit and a second element unit that are supplied with power through an input terminal and sense rotation of the rotating body; And
Controlling an output voltage through an output terminal of the integrated position sensing sensor by comparing a magnetic flux distribution output through the first element portion and the second element portion with a switching level by a comparator,
The step of calculating the switching level includes:
Wherein when the vehicle is started, a TPO (True Power On) switching level, which is an initial switching level, is set to the switching level. 10. The method of claim 9,
Further comprising the step of checking whether the predetermined learning has been performed based on the maximum value and the minimum value of the magnetic flux distribution output through the second element unit by the learning completion determining unit,
Wherein the step of calculating the switching level is based on a maximum value and a minimum value of the magnetic flux distribution output through the second element unit when the predetermined learning is completed. 11. The method of claim 10,
Wherein the step of calculating the switching level is performed by multiplying the maximum peak of the magnetic flux distribution output through the first element unit by a predetermined percentage when the preset learning is in progress. 10. The method of claim 9,
The abnormality diagnosis unit determines whether or not the cam sensor signal outputted based on the magnetic flux distribution sensed through the first element unit is synchronized with the crank sensor signal outputted based on the magnetic flux distribution sensed through the second element unit, Further comprising the step of diagnosing whether the integrated position detection sensor is abnormal or not. 10. The method of claim 9,
Wherein the second element portion is constituted by a plurality of second elements, and the second elements are arranged to surround the first sensor. 14. The method of claim 13,
Further comprising the step of detecting the rotational direction of the rotating body based on the magnetic flux distribution output from each of the plurality of second elements by the rotating direction detecting unit. 10. The method of claim 9,
Wherein the first element unit comprises a Hall element. 10. The method of claim 9,
Wherein the second element unit comprises a Hall element or an MR (Magneto Resistance) element.
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KR20220051618A (en) * 2020-10-19 2022-04-26 주식회사 현대케피코 Apparatus and method for controlling rotation detecting sensor of rotator

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US8098062B2 (en) 2008-08-22 2012-01-17 Honeywell International Inc. Comparator circuit having latching behavior and digital output sensors therefrom
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