KR101313303B1 - Signal Processor for Gap Compensation of Inductive Angle Sensor and Signal Processing Method of The Same - Google Patents

Abstract

The first absolute value for finding the absolute value of the measured value of a signal input from one receiving coil among a pair of receiving coils installed to have a phase difference of 90 degrees so that the gap compensation according to the amount of movement of the coupler can always provide an accurate measured value. A value calculator, a second absolute value calculator for obtaining an absolute value of a measured value of a signal input from another receiving coil, a value passed through the first absolute value calculator and a value passed through the second absolute value calculator; 1 adder, a second adder that adds the measured value of the signal input from one receiving coil to the value passed through the first adder, a half-life that divides the value passed by the second adder by 2, and a value that passes the half-life. A gap compensation signal processor for an inductance angle sensor including a divider divided by a value passed through a first adder is provided.

Description

Signal Processor for Gap Compensation of Inductive Angle Sensor and Signal Processing Method of The Same}

The present invention relates to a gap compensation signal processor and a signal processing method for an inductance angle sensor, and more particularly, it is possible to always obtain an accurate measurement value by correcting a signal of a receiving coil in response to a change in the distance between the receiving coil and the coupler. A gap compensation signal processor for an inductance angle sensor and a signal processing method.

In general, in the case of a steering wheel or fuel gauge of a vehicle, a shift lever position of a vehicle, and various mechanical devices, it is very important to measure an accurate value for a rotation angle or a linear travel distance because accurate control can be performed. Therefore, the angle sensor for measuring the rotation angle of the rotating body or the linear moving distance of the object is installed and used.

Usually, the angle sensor can be divided into contact type and non-contact type, and can be divided into electric resistance type, capacitance type, and electromagnetic induction type (inductance type).

Conventional inductance angle sensor is configured by arranging a plurality of receiving coils having a phase difference of 90 °, 180 ° between the semi-circular coupler on the excitation coil wound in a round ring shape.

As described above, the basic principle of the inductance angle sensor has a phase difference with each other as the coupler rotates, and the inductance of each receiving coil is changed, and information on the rotation angle can be extracted using the same.

However, if the distance between the coupler and the receiving coil is different from the set value during the assembling or use of the coupler, a change occurs between the measured value and the designed value, and the problem that the information on the exact rotation angle cannot be obtained. have.

Korean Patent No. 10-1042974 discloses a technique of adding a measured value measured from a pair of receiving coils and calculating a change in the value to perform correction according to the amount of movement of the coupler.

The present invention has been made by applying the above-described method and a new method, and using the ratio of the addition value and the subtraction value of a signal measured from a pair of receiving coils having a phase difference of 90 degrees, a gap compensation is performed according to the amount of movement of the coupler. It is an object of the present invention to provide a gap compensation signal processor and a signal processing method for an inductance angle sensor that can always provide accurate measurement values.

The gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention is a first absolute value calculator for obtaining an absolute value of a measured value of a signal input from one receiving coil among a pair of receiving coils installed to have a phase difference of 90 degrees. And a second absolute value calculator for obtaining an absolute value of a measured value of a signal input from another receiving coil, and a value obtained by adding a value passed through the first absolute value calculator and a value passed through the second absolute value calculator. A first adder, a second adder that adds a measured value of a signal input from the one receiving coil to a value passed through the first adder, a half-life of dividing the value passed by the second adder by two, and the half-life And a divider for dividing the passed value by the passed value of the first adder.

In the gap compensation signal processing method for an inductance angle sensor according to the present invention, the absolute value of a measured value of a signal input from one receiving coil among a pair of receiving coils installed to have a phase difference of 90 degrees is obtained, and the other receiving coil is used. The absolute value of the measured value of the signal inputted from is obtained, the value inputted from the one received coil obtained by the absolute value and the other input coil obtained from the absolute value obtained are added, and inputted from the two received coils. The absolute value is added to the measured value of the signal input from the one receiving coil, the two absolute values plus the measured value input from the one receiving coil divided by 2, divided by 2 And dividing the absolute value inputted from the two receiving coils by a value.

According to the gap compensation signal processor and signal processing method for an inductance angle sensor according to an embodiment of the present invention, it is possible to output the measured value by performing gap compensation according to the positional movement of the coupler, so that it is always possible to detect the correct rotation angle. It is possible.

1 is an exploded perspective view illustrating an example of an inductance angle sensor to which a gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention is applied.
2 is a graph showing a sinusoidal curve of a signal obtained from a pair of receiving coils having a 90 degree phase difference of the inductance angle sensor of FIG.
3 is a graph showing calculated values of A + B and AB in FIG. 2.
4 is a graph in which a linear change section is selected and combined to realize a 360 degree angle.
5 is a block diagram illustrating a gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention.

Next, a preferred embodiment of an inductance angle sensor gap compensation signal processor and a signal processing method according to the present invention will be described in detail with reference to the accompanying drawings. The present invention can be embodied in various forms and is not limited to the embodiments described below.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, wherein like numerals refer to like elements throughout.

First, a gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention receives a pair of pairs between a semicircular coupler 5 and an excitation coil 2 wound in a round ring shape as shown in FIG. 1. The coils 7 and 8 are applied to an inductance angle sensor configured to have a phase difference of 90 °.

In the above, the excitation coil 2 and the pair of receiving coils 7 and 8 are laminated to the substrate 1 at a slight interval.

The shape of the pair of receiving coils 7 and 8 is not limited to the shape of FIG. 1, and can be formed and applied in various configurations.

In the inductance angle sensor configured as described above, when the coupler 5 rotates while the power supply is applied to the excitation coil 2, an inductance current is generated in the pair of receiving coils 7 and 8. This measurement results in two sinusoids with a 90 ° phase difference as shown in FIG.

For example, in FIG. 2, if the sinusoidal curve obtained from one receiving coil 7 is GA, the sinusoidal curve obtained from another receiving coil 8 is represented by GB which has a 90 degree phase difference.

In FIG. 2, the rotation angle θ of the coupler 5 is shown on the x axis, and the voltage V is shown on the y axis.

In Fig. 2, the graphs represented by NA and NB are sinusoids obtained from one receiving coil 7 and the other receiving coil 8 when maintaining the designed reference gap.

Comparing the NA and NB curves and the GA and GB curves in FIG. 2, it can be seen that the absolute values of the maximum and minimum values of the GA and GB curves are reduced compared to the NA and NB curves. This means an error in the measured value generated as the position of the coupler 5 moves from the designed position during assembly error or use.

For example, comparing the NA and NB curves with the GA and GB curves in FIG. 2, the measured values A obtained from one receiving coil 7 in the first zone I between 90 and 180 degrees and It can be seen that the value (addition value A + B) plus the measured value B obtained from the other receiving coil 8 maintains a constant difference (gap).

By the way, in the 1st zone I, the value A obtained by subtracting the measured value B obtained from the other receive coil 8 from the measured value A obtained from one receive coil 7 (subtracted value AB) ) Is the ratio (R) obtained by dividing the measured value A obtained from one receiving coil 7 and the measured value B obtained from another receiving coil 8 (additional value (A + B)). Considering this, it is possible to derive the same result as in Equation 1 below.

As can be seen from the above equation (1), in the case of using the ratio R, it is possible to always obtain the same ratio value even when a gap change occurs. In other words, it is possible to always obtain an accurate value regardless of the change in the gap.

The effect of the ratio R is similarly obtained in the second zone (II), the third zone (III) and the fourth zone (IV).

Therefore, in the embodiment of the present invention, it is configured to detect the rotation angle by using the formula of the ratio R which can always obtain an accurate value irrespective of the change of the gap as described above.

3 shows the sum of the measured value A obtained from the one receiving coil 7 and the measured value B obtained from the other receiving coil 8 (addition value A + B) and the one A graph of the measured value A obtained from the receive coil 7 and the value (subtracted value AB) obtained by subtracting the measured value B obtained from the other receive coil 8 is shown.

As can be seen from FIG. 3, in the first zone I, the addition value A + B is constant while the subtraction value AB changes from a positive value to a negative value, and a second value is obtained. In zone (II), the addition value (A + B) changes from a positive value to a negative value, while the subtraction value (AB) is constant, and in the third zone (III), the addition value (A) While + B) is constant, the subtraction value AB changes from a negative value to a positive value, and in the fourth zone IV the addition value A + B is a negative value. The subtraction value AB is kept constant while

Therefore, in the first zone I, the variable subtraction value AB is used, in the second zone II, the addition value A + B is used, and in the third zone III, the subtraction value AB is used. In the fourth zone IV, the addition value (A + B) is used to show the graph in a rhombus shape as shown in FIG. 4.

In FIG. 4, when the position of the coupler 5 is changed, it can be represented by the inside small rhombus shape (it shows with a dashed-dotted line).

)하다.In each point on the rhombus graph of FIG. 4, the value obtained by adding the absolute value of the X coordinate and the absolute value of the Y coordinate is always constant (

)Do.

In the first zone (I), the value of the ratio (R) varies from -1 to 1 (-1 to 1). However, in actual use, the value of the ratio (R) is used from 0 to 1, so that 1 And then divide by two.

In the first zone I, since the value of X + Y is constant (X + Y = Const), the ratio R of the first zone I is expressed by Equation 2 below.

In the second zone II, since the value of -X + Y is constant (-X + Y = Const), the ratio R of the second zone II is expressed by the following equation (3). Also in the ratio R of the second zone II, 1 is added to the ratio value obtained, and then the division is divided by 2.

In the third zone (III), since the value of -X-Y is constant (-X-Y = Const), the ratio R of the third zone (III) is expressed by the following equation (4). Also in the ratio R of the said 3rd zone (III), 1 is added to the ratio value obtained, and it divides by 2, and it calculates.

In the fourth zone IV, since the value of X-Y is constant (X-Y = Const), the ratio R of the fourth zone IV is expressed by the following equation (5). Also in the ratio R of the fourth zone IV, 1 is added to the ratio value obtained, and then the division is divided by 2.

The equations (2) to (5) are expressed as one expression for the output V _{0 as} shown in the following equation (6).

In Equation 6, V ₀ represents an output value, and V _ref represents a reference voltage.

Next, the gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention constructed based on Equation 6, as shown in FIG. 5, the first absolute value calculator 10 and the second absolute value calculator. (12), the first adder 20, the second adder 22, the half-life 30, and the divider 40 are included.

In the first absolute value calculator 10, the absolute value of the measured value X of a signal input from one of the receiving coils 7 and 8, which is installed to have a phase difference of 90 degrees, is obtained. Obtain

In addition, the gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention measures an offset adjustment value Xc for offset cancelation with respect to a signal input from the one receiving coil 7. It is also possible to further configure the first subtractor 80 to subtract from and then send it to the first absolute value calculator 10.

The second absolute value calculator 12 obtains the absolute value of the measured value Y of the signal input from the other receiving coil 8.

The offset adjustment value Yc is also subtracted from the measured value for offset cancellation for the signal input from the other receiving coil 8 and then transmitted to the second absolute value calculator 12. The second subtractor 82 is further configured.

The first adder 20 adds a value passed through the first absolute value calculator 10 and a value passed through the second absolute value calculator 12.

In the second adder 22, the measured value X of the signal input from the one receiving coil 7 is added to the value passed through the first adder 20.

In the half-life 30, the value passing through the second adder 22 is divided by two.

The divider 40 divides the value passed through the half-life 30 by the value passed through the first adder 20.

The divider 40 may be connected to a multiplier 50 that multiplies the reference voltage Vref to adjust the final output V ₀ .

Next, in the gap compensation signal processor for an inductance angle sensor according to an embodiment of the present invention configured as described above, a process of processing a signal measured from a pair of receiving coils (7), (8) of the present invention A gap compensation signal processing method for an inductance angle sensor according to another embodiment will be described.

First, the absolute value of the measured value of a signal input from one receiving coil 7 among the pair of receiving coils 7 and 8 provided to have a phase difference of 90 degrees is obtained, and from the other receiving coil 8 Obtain the absolute value of the measured value of the input signal.

It is also possible to perform offset cancellation on the measured value of the input signal before obtaining the absolute value.

Then, the value input from one receiving coil 7 obtained with the absolute value and the other input coil 8 with the absolute value obtained are added, and from the two receiving coils 7 and 8, The measured value of the signal input from the said one receiving coil 7 is added to the value which added the absolute value input.

Next, the two absolute values plus the measured value input from the one receiving coil 7 are divided by two, and the value divided by two is input from the two receiving coils 7 and 8. Divided by the absolute value.

It is also possible to adjust the output value by multiplying the reference voltage Vref before outputting the final value.

If the equation (6) is rearranged, it can be expressed as the following equation (7).

와 같이 나타내어지며, Sign(X)는 다음의 수학식 8과 같이 나타내어진다.In Equation 7, C is

It is represented as, and Sign (X) is expressed as shown in Equation 8 below.

Next, the gap compensation signal processor for an inductance angle sensor according to another embodiment of the present invention constructed based on Equation 7 is also shown in FIG. 6, where the first absolute value calculator 10 and the second absolute value are used. A calculator 12, a first adder 20, a second adder 22, a half-life 30, and a divider 40 are included.

A first subtractor for subtracting the offset adjustment value (Ac or Bc) from the measured value for offset cancellation to the signal input to the first absolute value calculator 10 and the second absolute value calculator 12 in the above It is also possible to further provide the 80 and the second subtractor 82, respectively.

It is also possible to provide a phase detect rectifier (PDR) 90 before the offset removal is performed by the first subtractor 80 and the second subtractor 82.

The phase detection rectifier 90 is configured as shown in FIG.

In the above, a preferred embodiment of the gap compensation signal processor and the signal processing method for an inductance angle sensor according to the present invention has been described. However, the present invention is not limited thereto, and the present invention is not limited thereto. Modifications can be made and this is also within the scope of the present invention.

10-first absolute value calculator, 12-second absolute value calculator, 20-first absolute value adder
22-second adder, 30-half-life, 40-divider, 50-multiplier

Claims (6)

A first absolute value calculator for obtaining an absolute value of a measured value of a signal input from one receiving coil among a pair of receiving coils installed to have a phase difference of 90 degrees;
A second absolute value calculator for obtaining an absolute value of a measured value of a signal input from another receiving coil;
A first adder for adding a value passed through the first absolute value calculator and a value passed through the second absolute value calculator,
A second adder for adding a measurement value of a signal input from the one receiving coil to a value passing through the first adder;
A half-life of dividing the value passed by the second adder by 2,
And a divider for dividing the value passing through the half life by the value passing through the first adder. The method according to claim 1,
A first subtractor for subtracting an offset adjustment value from the measured value for offset cancellation for the signal input from the one reception coil, and then transmitting the offset adjustment value to the first absolute value calculator;
An inductance angle further comprising a second subtractor for subtracting an offset adjustment value from the measured value for offset cancelation with respect to a signal input from the other receiving coil, and then transmitting the offset adjustment value to the second absolute value calculator; Gap Compensation Signal Processor for Sensors. The method according to claim 1 or 2,
And a multiplier coupled to the divider for multiplying a reference voltage to adjust to a final output. Obtain an absolute value of the measured value of a signal input from one receiving coil among a pair of receiving coils installed to have a phase difference of 90 degrees,
Obtain the absolute value of the measured value of the signal input from the other receiving coil,
Adding the value input from one receiving coil having the absolute value and the value input from the other receiving coil having the absolute value,
The measured value of the signal input from the one receiving coil is added to the value obtained by adding the absolute value input from the two receiving coils,
Dividing the two absolute values by the measured value input from the one receiving coil divided by 2,
And dividing the value divided by two by the sum of the absolute values input from the two receiving coils. The method of claim 4,
And performing offset cancellation on the measured value of the input signal before the absolute value is obtained. The method according to claim 4 or 5,
Gap compensation signal processing method for an inductance angle sensor further comprising the step of adjusting the output value by multiplying the reference voltage before output to the final value.

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