KR101741531B1 - inductive sensor capable of performing fast and precise position sensing and being easily maintained - Google Patents

inductive sensor capable of performing fast and precise position sensing and being easily maintained Download PDF

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Publication number
KR101741531B1
KR101741531B1 KR1020150044776A KR20150044776A KR101741531B1 KR 101741531 B1 KR101741531 B1 KR 101741531B1 KR 1020150044776 A KR1020150044776 A KR 1020150044776A KR 20150044776 A KR20150044776 A KR 20150044776A KR 101741531 B1 KR101741531 B1 KR 101741531B1
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South Korea
Prior art keywords
inductive sensor
present
position detection
signal
nonlinearity
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KR1020150044776A
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Korean (ko)
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KR20160117734A (en
Inventor
최천형
이창열
박인택
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주식회사오리온테크놀리지
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Priority to KR1020150044776A priority Critical patent/KR101741531B1/en
Publication of KR20160117734A publication Critical patent/KR20160117734A/en
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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
    • G01D5/20—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 by varying inductance, e.g. by a movable armature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • 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
    • G01D5/20—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 by varying inductance, e.g. by a movable armature
    • G01D5/22—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 by varying inductance, e.g. by a movable armature differentially influencing two coils
    • G01D5/225—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 by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils
    • G01D5/2258—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 by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core
    • G01D5/2266—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 by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the mutual induction between the two coils by a movable ferromagnetic element, e.g. core specially adapted circuits therefor

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The inductive sensor according to the present invention is capable of detecting data or information necessary for position sensing of various materials, such as reduction of nonlinearity of position measurement value, correction of temperature error and circuit error, zero point based on digital signal and span adjustment, Can be received through communication. Therefore, the inductive sensor according to the present invention is very convenient to maintain.

Description

An inductive sensor capable of performing fast and precise position sensing and being easy to maintain.

The present invention relates to an inductive sensor, and more particularly, to an inductive sensor for position sensing which can perform quick and accurate position sensing with respect to various position sensing objects and is easy to maintain.

Accurately determining the position of the position sensing object is very important in the field of control and measurement. For example, locating a fuel booster or an exhaust valve in the engine can be a very important criterion for controlling the engine.

For example, a marine engine is controlled by an engine control device. In this device, when the inductive sensor measures and feeds back the positions of the fuel booster and the exhaust valve for fuel injection, the engine control amount is accurately calculated based on this feedback. Therefore, the measurement of the position of the fuel booster and the exhaust valve is a very important factor for the control of the marine engine.

This requires a quick response time (or speed) in accordance with the processing performance of the engine control device. Due to the characteristics of the marine engine, reliable operation is required even in severe operating conditions of high temperature and high pressure. However, in the case of the conventional inductive sensor, the linearity is corrected by the analog type linearity correction circuit in order to satisfy the fast response time, which is the main performance, but the non-linearity is not as good as about 2% . Recently, the nonlinearity is improved by the technique of converting the analog signal into the digital signal and correcting the nonlinearity. In this case, however, the response frequency is not as good as about 1 kHz.

In the conventional inductive sensor, a circuit is sensitive to a pressure of 30 Bar or more and a high temperature operation environment of 100 ° C or more, and a circuit error largely occurs due to environmental changes. Zero point adjuster that adjusts the zero point of data signal and span adjuster that adjusts the maximum value of zero point is very vulnerable to environmental change because it uses variable resistance type analog method. Set the value

There was a disadvantage that it could not be changed afterwards and there was a lot of inconvenience in actual use.

In addition, the inductive sensor detects the amount of attenuation by the object to be measured by forming a high-frequency magnetic field on the metal, which largely changes the non-linearity of the main performance depending on the characteristics of the object to be measured. The metal used in the marine engine mainly uses five metals. In the conventional inductive sensor, the nonlinearity is corrected for one metal and the nonlinearity for the remaining metals is confirmed to be within 2% . This is because there is a problem that the non-linearity greatly changes depending on the characteristics of the measured object.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inductive sensor capable of reducing the nonlinearity of a position measurement value of a position sensing object to enable precise and quick position measurement.

Another object of the present invention is to provide an inductive sensor capable of compensating for a temperature error and a circuit error to enable more precise position measurement on a position sensing object.

According to another aspect of the present invention, there is provided an inductive sensor for performing position adjustment of a position data and span adjustment based on a digital signal, will be.

Another object of the present invention is to provide an inductive sensor capable of reducing non-linearity, correcting a temperature error and a circuit error, performing zero point and span adjustment based on a digital signal, .

It is another object of the present invention to provide a method and an apparatus for detecting data or information necessary for reducing a nonlinearity of a sensing position value, correcting a temperature error and a circuit error, adjusting a zero point based on a digital signal, The present invention provides an inductive sensor capable of receiving an external signal from outside through communication.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided an inductive sensor including: a resonator for outputting an oscillation signal according to an L-C resonance mechanism; Detecting a change in the oscillation signal in accordance with a distance change to a position detection object made of a metal material and detecting a change in the oscillation signal based on a first electrical A detector for generating a signal; A communication unit for receiving first correction information corresponding to the material of the position detection object for reducing the nonlinearity of the first electrical signal with respect to the distance to the position detection object in consideration of the material of the position detection object; Corrects the first electrical signal based on the first correction information corresponding to the material of the position detection object and generates a second electrical signal whose nonlinearity with respect to the distance to the position detection object is within a predetermined range A control unit; And an output unit for converting the second electrical signal into a third electrical signal corresponding to the distance to the position detection target and outputting the third electrical signal.

The position detection object may be a fuel booster or an exhaust valve of the marine engine.

The communication unit may receive the linear correction information corresponding to the material of the position detection object through at least one of the power supply line and the signal output line of the output unit.

The communication unit can further receive the calibration adjustment information and the span adjustment information for the second electrical signal corresponding to the material of the position detection object. At this time, the controller may generate the second electrical signal by further considering the received zero point adjustment information and the span adjustment information.

The inductive sensor may further include temperature sensing means, and the communication unit may further receive second correction information for correcting at least one of a circuit error and a temperature error of the inductive sensor. At this time, the controller may generate the second electrical signal by further considering the second correction information.

Converting the first electrical signal into a digital value using an embedded analog to digital converter (ADC) and a first DMA (Direct Memory Access) means; Correcting at least one of a circuit error and a temperature error for the converted digital value based on the second correction information and performing linear interpolation for the converted digital value based on the first correction information Performing at least one of the following steps to generate a corrected digital signal; And converting the corrected digital signal into the second electrical signal using a built-in second DMA means and a digital to analog converter (DAC).

The inductive sensor according to the present invention can reduce the nonlinearity of the position measurement value of the position sensing object and perform more precise and quick position measurement with respect to the position sensing object.

INDUSTRIAL APPLICABILITY The inductive sensor according to the present invention can perform more precise position measurement on a position sensitive object by compensating for temperature error and circuit error.

The inductive sensor according to the present invention performs zero position adjustment and span adjustment on position data based on a digital signal and can perform position measurement with respect to a position detection object more accurately even when the environment changes.

The inductive sensor according to the present invention can reduce the nonlinearity, correct the temperature error and circuit error, and adjust the zero point and span based on the digital signal in consideration of the material of the position sensing object.

The inductive sensor according to the present invention is capable of detecting data or information necessary for position sensing of various materials, such as reduction of nonlinearity of position measurement value, correction of temperature error and circuit error, zero point based on digital signal and span adjustment, Can be received through communication. Therefore, the inductive sensor according to the present invention is very convenient to maintain.

1 is a block diagram of a marine engine equipped with an inductive sensor according to the present invention.
2 is a state diagram showing an inductive sensor according to the present invention mounted on a marine engine.
3 is an actual photograph and an exploded perspective view of an inductive sensor according to the present invention.
4 is a block diagram of an inductive sensor according to the present invention.
5 is a circuit diagram of a resonance part and a detection part of an inductive sensor according to the present invention.
6 is a circuit diagram of a communication unit of the inductive sensor according to the present invention.
7 is a circuit diagram of a control unit of the inductive sensor according to the present invention.
8 is a circuit diagram of an output part of the inductive sensor according to the present invention.
9 is a circuit diagram of a power supply section of an inductive sensor according to the present invention.
10 is a flowchart showing an example of an inductive sensor driving method according to the present invention.
11 is a flowchart showing another example of the inductive sensor driving method according to the present invention.
12 is a state diagram for performing a test for measuring a nonlinearity of a measured position of an inductive sensor according to the present invention.
13 shows the nonlinearity of the position of the position sensing object measured by the inductive sensor according to the present invention, according to the test method shown in Fig.
14 is a state diagram for performing a test for measuring a response time of the inductive sensor according to the present invention.
15 and 16 are graphs for measuring the response time of the inductive sensor according to the present invention measured according to the test method shown in FIG.

The foregoing objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Like reference numerals designate like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, a lighting apparatus according to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a block diagram of a marine engine 10 equipped with an inductive sensor 100 according to the present invention. Referring to FIG. 1, the marine engine 10 includes an inductive sensor 100, an exhaust valve 200, a fuel booster 300, and an engine control device 400. 1 are not essential, the marine engine 10 according to the present invention may have more or less components than those of the present invention. Hereinafter, the components will be described in order.

The exhaust valve 200 is a valve for controlling the discharge of gas, and the fuel booster 300 is responsible for fuel injection. The inductive sensor 100 detects the position of the exhaust valve 200 and the fuel booster 300 and transmits the sensed position to the engine control device 400. The engine control unit 400 may generate and output various signals for engine control based on the position information of the exhaust valve 200 and the fuel booster 300.

Fig. 2 is a state diagram showing that the inductive sensor 100 according to the present invention is mounted on the marine engine 10. Fig. 2 (a) and 2 (b), the inductive sensor 100 is mounted on a marine engine for sensing the position of the fuel booster 300 and the exhaust valve 200, .

The inductive sensor 100 may have the following characteristics.

1. The inductive sensor 100 according to the present invention can reduce the nonlinearity of the position measurement value of the position sensing object and perform more precise and quick position measurement with respect to the position sensing object.

2. The inductive sensor 100 according to the present invention can perform more precise position measurement on the position sensing object by compensating for temperature error and circuit error.

3. The inductive sensor 100 according to the present invention performs zero position adjustment and span adjustment on position data based on a digital signal to perform position measurement with respect to a position detection object more accurately even in a change of environment.

4. The inductive sensor 100 according to the present invention can reduce the nonlinearity, correct the temperature error and the circuit error, and adjust the zero point and the span based on the digital signal in consideration of the material of the position sensing target.

5. Inductive sensor 100 according to the present invention is capable of detecting data or information necessary for positional sensing of various materials, such as reduction of non-linearity, correction of temperature error and circuit error, zero point based on digital signal, Through communication. Therefore, the inductive sensor according to the present invention is very convenient to maintain.

The configuration (or structure) and the function (or operation) of the inductive sensor 100 will be described herein on the assumption that the inductive sensor 100 according to the present invention is mounted on the marine engine 10 . However, the inductive sensor 100 sensor according to the present invention may be mounted on an aircraft engine, various vehicle engines, construction or engines of civil engineering equipment, and may be used to measure the position of a position sensing object. However, the scope of the present invention is not limited thereto.

Hereinafter, the characteristics of the inductive sensor 100 according to the present invention will be described in more detail with reference to FIGS. 3 to 21. FIG.

3 is an actual photograph and an exploded perspective view of the inductive sensor 100 according to the present invention.

The coil used to generate the signal corresponding to the position sensing of the position sensing object in the inductive sensor 100 is mounted in a body formed with a hollow portion. The holes (separated by dotted lines in FIG. 3 (a)) provided in the combination part pass through screws or bolts necessary for fixing the inductive sensor 100. The inductive sensor 100 can receive data or information necessary for non-linearity reduction, correction of temperature error and circuit error, zero point based on a digital signal, and span adjustment from outside through communication. Therefore, a substantial part of maintenance, except hardware repair or replacement, can be performed in a state in which the inductive sensor 100 is mounted, and maintenance is very convenient compared to the conventional inductive sensor.

The PCB on which the semiconductor chip, various electronic or electric elements necessary for the operation of the inductive sensor 100 is mounted is coupled to a bracket and is protected by a cover. Cable grand is the cable connection part of power cable or communication cable.

4 is a block diagram of an inductive sensor 100 according to the present invention. 4, the inductive sensor 100 includes a resonance unit 110, a detection unit 120, a communication unit 130, a control unit 140, an output unit 150, and a power supply unit 160. 4 are not essential, the inductive sensor 100 according to the present invention may have more or fewer components. Hereinafter, the components will be described in order.

The resonator 110 may output an oscillation signal according to an L-C resonance mechanism. The oscillation signal is changed in accordance with the oscillation signal according to a distance change to a position detection object made of a metal material. The detection unit 120 can detect a change in the oscillation signal in accordance with a distance change to a position detection object made of a metal. Then, the detection unit 120 may generate a first electrical signal having a level corresponding to the change of the detected oscillation signal and having a non-linearity with respect to the distance to the position detection object. In the present specification, the electrical signal may be an analog signal, a digital signal, a voltage signal, or a current signal.

5 is a circuit diagram of the resonator part 110 and the detection part 120 of the inductive sensor 100 according to the present invention.

In the resonance unit 110, a parallel resonance tank circuit including an inductor 111 and a capacitor 112 is connected to the first transistor 113. An oscillation signal of 250 KHz or more can be generated by L-C resonance of the inductor 111 and the capacitor 112. On the other hand, the second transistor 114 and the first operational amplifier 115 constitute a feedback circuit.

The detection unit 120 detects the attenuation of the oscillation signal due to the eddy current formed by approaching or separating the position sensing object such as the exhaust valve 200 or the fuel booster 300 of the marine engine 10. The attenuated oscillation signal is subjected to full wave rectification and filtering through the second operational amplifier 121, the pair of diodes 122 and the third operational amplifier 123. Then, the output signal of the third operational amplifier 123 is converted into a voltage that can be processed by the control unit 140 (that is, a first electrical signal) by the fourth operational amplifier 124 and is output.

In the example of FIG. 5, the output signal of the detector 120 may be an analog signal having a predetermined voltage level. On the other hand, the first electrical signal has a level corresponding to the change of the detected oscillation signal and has non-linearity with respect to the distance to the position detection object.

The resonance unit 110 and the detection unit 120 shown in FIG. 5 are only examples of the resonance unit and the detection unit included in the inductive sensor 100 according to the present invention, and the scope of the present invention is not limited thereto.

Referring again to FIG. 4, the communication unit 130 may include data necessary for reducing the non-linearity of measured values of a position sensing object, correcting temperature errors and circuit errors, adjusting the zero point based on a digital signal, Information can be received from outside via communication. That is, the inductive sensor 100 according to the present invention can receive position data or information from the outside through communication, and can perform position measurement of a position sensitive object of various materials, and the maintenance thereof is very convenient.

 The communication unit 130 can receive the above-described various data from outside through at least one of the power supply line and the signal line of the output unit 150 without a separate communication line. Therefore, the inductive sensor 100 according to the present invention can perform communication with the outside without adding any additional hardware as compared with the conventional inductive sensor.

Hereinafter, specific examples of data that can be received through the communication unit 130 will be described.

First of all, the position detection is performed through the communication unit 130 to reduce the non-linearity of the first electrical signal with respect to the distance to the position detection object in consideration of the material (e.g., metal) It is possible to receive the first correction information corresponding to the material of the object.

For example, five levels of metal are typically used in the marine engine 10, and the inductive sensor 100 according to the present invention can receive first correction information corresponding to each of the five metals. Data reception from the outside in consideration of the metal material may be the same for the second correction information for correcting at least one of the zero point adjustment information, the span adjustment information, and the temperature and the circuit error to be examined.

The communication unit 130 may further receive the zero point adjustment information and the span adjustment information for the position detection target position measurement value. The communication unit 130 may further receive second correction information for correcting at least one of a circuit error and a temperature error of the inductive sensor.

6 is a circuit diagram of the communication unit 130 of the inductive sensor 100 according to the present invention.

Referring to FIG. 6, it is understood that the communication unit 130 may be implemented as a communication chip 131 and various devices necessary for performing the operation. The communication unit 130 may perform a communication function with the outside through the HART communication or the power line communication through the input / output signal line in consideration of the characteristic of the inductive sensor 100, which is difficult to provide a separate communication line.

Meanwhile, the communication unit 130 shown in FIG. 6 is merely an example of a communication unit included in the inductive sensor 100 according to the present invention, and the scope of the present invention is not limited thereto. For example, the communication unit 130 may perform a communication function with the outside through power line communication through a power supply line.

Referring again to FIG. 4, the controller 140 controls the operation of the elements of the inductive sensor 100 as a whole. The control unit 140 may generate a second electrical signal by correcting the first electrical signal output from the detection unit 120 based on the first correction information received through the communication unit 130. [ In this case, the second electrical signal may be an electrical signal whose non-linearity with respect to the distance to the position detection object is within a predetermined range.

The control unit 140 may further process the first electrical signal in consideration of the zero point adjustment information and the span adjustment information received through the communication unit 130. [ Therefore, the zero point and the span adjustment in the inductive sensor 100 according to the present invention can be less affected by the environment than the zero point adjustment and the span adjustment through the variable resistance operation in the conventional inductive sensor, and can be more accurate.

The controller 140 may generate the second electrical signal by further considering second correction information for correcting at least one of a temperature error and a circuit error. The second correction information may also be received from the outside via the communication unit 130.

7 is a circuit diagram of the control unit 140 of the inductive sensor 100 according to the present invention.

Referring to FIG. 7, the controller 140 includes one chip 141 and a small number of elements. This may mean that the nonlinearity of the position measurement value for various position detection targets of various materials, the correction of the temperature error and the circuit error, the zero point based on the digital signal, and the span adjustment are all performed in the control unit 140 . Due to such data processing in one chip, the data processing speed of the inductive sensor 100 according to the present invention can be increased as compared with the conventional inductive sensor.

The controller 140 may be configured to digitize and digitally convert an analog signal of an electrical signal using an embedded analog to digital converter (ADC), a digital to analog converter (DAC), and a direct memory access (DMA) And can perform analogization of the signal. In this case, the control unit 140 can increase the data processing speed by directly transferring a large amount of data to and from a memory (not shown) at a high speed by the DMA method. Although not shown in the drawing, the memory may be included in the controller 140 or may be a separate memory provided outside the controller 140.

That is, the controller 140 receives an analog signal from the detector 120, converts the analog signal into a digital signal, performs various signal processing, and converts the analog signal into an analog signal.

The controller 140 may include temperature sensing means. Of course, the temperature sensing means may be a separate component separated from the controller 140 in terms of hardware. Meanwhile, the control unit 140 shown in FIG. 7 is only one example of a control unit included in the inductive sensor 100 according to the present invention, and the scope of the present invention is not limited thereto.

4, the output unit 150 outputs a second electrical signal, which is output from the controller 140 and whose non-linearity with respect to the distance to the position detection object is within a predetermined range, to the position detection target To a third electrical signal corresponding to the distance of the first electrical signal. Assuming that the inductive sensor 100 is mounted on the marine engine 10, the engine control device 400 of the marine engine 10 controls the exhaust valve 200 And the position of the fuel booster 300 can be determined. Meanwhile, as described above, the input / output line of the output unit 150 may be used for communication of the communication unit 130 as well.

8 is a circuit diagram of an output section 150 of the inductive sensor 100 according to the present invention.

Referring to FIG. 8, the output unit 150 may be implemented by a chip 151 and a plurality of elements, for converting an electrical signal received from the controller 140. The chip 151 may convert a second electrical signal, which is a voltage signal output from the controller 140, into a current value and output the current value. Meanwhile, the output unit 150 shown in FIG. 8 is an example of an output unit that can be included in the inductive sensor 100 according to the present invention, and the scope of the present invention is not limited thereto.

Referring again to FIG. 4, the power supply unit 160 converts the power received from the outside into the power required by the elements of the inductive sensor 100, and outputs the converted power.

9 is a circuit diagram of the power supply unit 160 of the inductive sensor 100 according to the present invention.

9, the power supply unit 160 may include a surge protection unit 161, a voltage stabilizer 62, and the like. Meanwhile, the power supply unit 160 shown in FIG. 9 is only an example of a power supply unit that can be included in the inductive sensor 100 according to the present invention, and the scope of the present invention is not limited thereto.

10 is a flowchart showing an example of a method of driving the inductive sensor 100 according to the present invention. Hereinafter, the driving method will be described with reference to necessary drawings.

First, first correction information corresponding to the material of the position detection object is received (S100) for reducing non-linearity with respect to the distance to the position detection object through the communication unit 130. [ The received first correction information is stored in a memory in the controller 140 or in a separately prepared memory.

In this state, the oscillation signal output from the resonance unit 110 changes in accordance with the distance change to the position detection object, which is a metal material, and the detection unit 120 detects the change of the oscillation signal (S110). Then, the detection unit 120 generates a first electrical signal having a level corresponding to the change of the detected oscillation signal and nonlinear with respect to the distance to the position detection object (S120). The first electrical signal may be an analog voltage signal.

Then, the control unit 140 corrects the first electrical signal based on the first correction information corresponding to the material of the position detection object, so that the nonlinearity with respect to the distance to the position detection target is within a predetermined range Lt; RTI ID = 0.0 > (S130). ≪ / RTI > The second electrical signal may be an analog voltage signal.

Then, the output unit 150 may convert the second electrical signal into a third electrical signal corresponding to the distance to the position detection target and output the third electrical signal (S140). Then, the object on which the inductive sensor 100 is mounted can determine the position of the position detection object based on the third electrical signal. As described above, the position detection object may be the exhaust valve 200 and the fuel booster 300 of the marine engine 10.

11 is a flowchart showing another example of the inductive sensor 100 driving method according to the present invention. Hereinafter, the driving method will be described with reference to necessary drawings.

First, the first correction information and the second correction information for compensating the circuit error and the temperature error corresponding to the material of the position detection object for reducing the non-linearity with respect to the distance to the position detection object through the communication unit 130 are received And stored (S200). The received first and second correction information are stored in a memory in the control unit 140 or in a separately prepared memory.

When the first electrical signal reflecting the change in distance from the detection unit 120 to the position detection target is received in the state where the first and second correction signals are stored, the control unit 140 controls the built-in ADC (Analong to Digital Converter) And first DMA (Direct Memory Access) means to convert the first electrical signal into a digital value and output the digital value (S210).

Then, the control unit 140 corrects at least one of the circuit error and the temperature error based on the second correction information with respect to the converted digital value, and the step of correcting at least one of the circuit error and the temperature error based on the first correction information, Performing linear interpolation on the digital value, and generating and outputting the corrected digital signal (S220).

Then, the control unit 140 converts the corrected digital signal into the second electrical signal using a built-in second DMA unit and a digital to analog converter (DAC) (S230). Then, the output unit 150 converts the second electrical signal into a third electrical signal corresponding to the distance to the position detection object and outputs the third electrical signal. In the object equipped with the inductive sensor 100, It is possible to determine the position of the position detection object based on the signal, and perform various control operations based thereon.

12 is a state diagram for performing a test for measuring the nonlinearity of the measured position with respect to the position sensing object of the inductive sensor 100 according to the present invention.

The inductive sensor 100 is mounted on the test jig 500 and the distance to the position sensing object is varied from 0.5 mm to 7.5 mm by 0.5 mm using a vernier caliper, To measure the current with respect to the distance to the position sensing object. The nonlinearity of the measured position value based on the distance to the position sensing object and the current value can be calculated.

Fig. 13 shows the nonlinearity of the position of the position detection object measured by the inductive sensor 100 according to the present invention, according to the test method shown in Fig. For reference, the material of the position detection object in Fig. 13 is a representative metal that can be used for the marine engine in S480.

Referring to FIG. 13, it can be seen that when the position detection target material is S480 metal, the nonlinearity with respect to the separation and approach of the position detection object is within 0.09%. Although not shown in the drawings, the nonlinearity with respect to the position detection object by the inductive sensor 100 according to the present invention was also measured for S45C metal, S355 metal, S439 metal, 80A metal, SNCRW metal and the like. However, for all of the above metals, the nonlinearity to spacing was within 0.52%, and the nonlinearity to approach was specified to be within 0.47%.

As described above, it can be seen that the nonlinearity of the current value measured by the inductive sensor 100 according to the present invention is very small, ranging from 0.09% to 0.52% with respect to various metals. The inductive sensor 100 may be an effect of receiving and applying linear correction data according to the kind of metal from the outside. On the other hand, considering that the nonlinearity of the conventional inductive sensor is 1% to 2%, the inductive sensor 100 according to the present invention has a very small nonlinearity.

14 is a state diagram for performing a test for measuring the response time of the inductive sensor 100 according to the present invention. Referring to FIG. 14, the inductive sensor 100 is connected to the signal generators 700 and 800, and the waveform measuring apparatus 900 for calculating the response time is connected to the inductive sensor 100.

15 and 16 are graphs for measuring the response time of the inductive sensor 100 according to the present invention measured according to the test method shown in FIG.

Referring to FIG. 15, it can be seen that the response time (i.e., the rising time) is 310 usec when the distance to the position detection object is large. If this is expressed as a response frequency, the response frequency of the inductive sensor 100 is 1 / (310 X 10 -6 ) Hz. That is, the response frequency of the inductive sensor 100 reaches about 3.23 kHz.

Referring to FIG. 16, it can be seen that the polling time is 610 usec when the distance to the position detection object approaches. The frequency of the inductive sensor 100 is 1 / (610 X 10 -6 ) Hz. That is, the response speed of the inductive sensor 100 reaches about 1.64 kHz.

Considering that the response frequency of the conventional inductive sensor is about 1 kHz, the response frequency of the inductive sensor 100 according to the present invention is three times as large as the conventional one when the position detection object is separated from the position detection object, It can be seen that it is over.

At least some of the inductive sensor drive methods described herein may be implemented by separate software modules that perform one function or operation. Such software code may be implemented by a software application written in a suitable programming language. In addition, the software code may be embedded in the control unit or may be stored in a separate memory and executed by the control unit.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

10: Marine engine 100: Inductive sensor
110: Resonator 120: Detector
130: communication unit 140:
150: Output section 160: Power section
200: exhaust valve 300: fuel booster
400: engine control device

Claims (6)

A resonance unit for outputting an oscillation signal according to an LC resonance mechanism;
A detector for detecting a change of the oscillation signal in accordance with a distance change to a position detection object made of a metal and generating an analog signal having a level corresponding to a change of the detected oscillation signal and for a distance to the position detection object;
A communication unit for receiving correction information for correcting nonlinearity of the analog signal and zero point and span adjustment information from a mounted ship through a power supply line in consideration of a material of the position detection object; And
The analog signal is converted into a digital signal and the zero point and the span of the digital signal are adjusted through a digital operation using the zero point and the span adjustment information received through the power supply line, Performing nonlinearity correction on the digital signal on which the zero point and the span adjustment are performed through a digital operation using the correction information,
Linearity of the analog signal to a response frequency of 3 kHz or more so that the nonlinearity is within 0.09% to 0.52% when the position detection object is distant from the S45C metal, S355 metal, S439 metal, 80A metal and SNCRW metal material And a control section for correcting the nonlinearity of the analog signal at a response frequency of 1.5 kHz or more so that the nonlinearity is within a range of 0.09% to 0.47% when the position detection object approaches the position detection induction sensor . delete delete delete delete delete
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JP2012112751A (en) * 2010-11-24 2012-06-14 Mitsubishi Electric Corp Sensor and method for detecting constituent metal of object and distance to object

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JP2012112751A (en) * 2010-11-24 2012-06-14 Mitsubishi Electric Corp Sensor and method for detecting constituent metal of object and distance to object

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