KR101897640B1 - An Apparatus And A Method For Testing A Resolver - Google Patents

Abstract

A resolver trouble diagnosis apparatus according to an embodiment of the present invention includes: a motor section including a resolver; A resolver failure detecting circuit including an input for receiving an output of the resolver, an output voltage adjusting unit for amplifying the output of the resolver, and a PWM signal generating unit for generating a PWM signal based on the output of the output voltage adjusting unit. And a microcontroller unit for determining whether the resolver is abnormal based on a duty ratio of the output signal of the PWM signal generating unit. Therefore, according to the present invention, resolver normal operation, ground short fault, single wire fault, and resolver abnormality can be distinguished by subdividing the fault diagnosis into the existing fault. Therefore, it is possible to protect the vehicle through detailed fault diagnosis and improve the safety of the vehicle.

Description

[0001] The present invention relates to a resolver fault diagnosis apparatus and method,

The present invention relates to a resolver failure diagnosis apparatus and method, and more particularly, to a resolver failure diagnosis apparatus and method for diagnosing a short circuit / disconnection failure of a resolver in a failure diagnosis mode.

As the spread of hybrid and electric vehicles begins to expand, the number of motors and their role in automobile parts is increasing day by day. Particularly, in a luxury car, more motors tend to be mounted, so that the phase of automotive motors as automobile parts is continuously increasing. Therefore, motor control technology has become a core technology of automobiles.

In order to control the motor, an electric vehicle uses a speed sensor to measure the motor speed. Especially, in order to measure the speed of motors of hybrid automobiles and electric automobiles which require high reliability, Resolver which has high mechanical strength and excellent environmental resistance is widely used.

Fig. 8 shows the configuration of an existing resolver. In the case of the fault diagnosis method, the existing resolver is configured to calculate the input voltage value of the resolver without a separate fault diagnosis circuit, and then to judge the abnormality. However, through the above-described fault diagnosis, detailed fault types such as disconnection and ground fault can not be known at the time of confirmation, and it is possible to know only the abnormality.

However, there is an increasing demand for a detailed diagnosis method for failures. Therefore, there is a desperate need for a technique capable of identifying various types of failures, rather than a method of diagnosing whether a failure has occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resolver failure diagnosis apparatus and method capable of distinguishing various failures such as disconnection / ground failure.

A resolver trouble diagnosis apparatus according to an embodiment of the present invention includes: a motor section including a resolver; A resolver failure detecting circuit including an input for receiving an output of the resolver, an output voltage adjusting unit for amplifying the output of the resolver, and a PWM signal generating unit for generating a PWM signal based on the output of the output voltage adjusting unit. And a microcontroller unit for determining whether the resolver is abnormal based on a duty ratio of the output signal of the PWM signal generator, wherein the microcontroller unit is configured to determine whether the resolver is abnormal based on the duty ratio And dividing the interval of the duty ratio into at least a first interval, a second interval, a third interval and a fourth interval, and classifying the state of the resolver according to the interval of the duty ratio, The fourth section is a section from the smallest to the largest in size, the first section is a ground short-circuit abnormality section, the second section is a section exceeding the resolver itself, the third section is a normal section, May be a single-wire fault section.

In this case, the input unit includes a NOT buffer and a ground short detection transistor. When the ground short is present, the NOT buffer turns on the ground short detection transistor to input the ground voltage to the output voltage adjustment unit.

The output voltage adjuster includes a bias voltage and an operational amplifier. The output of the resolver is biased by the bias voltage, amplified by the operational amplifier, and applied to the PWM signal generator.

The PWM signal generator includes a reference voltage generator and a comparator. The output of the output voltage adjuster is applied to a first input of the comparator, and the reference voltage generated by the reference voltage generator is input to a second input of the comparator. Can be applied.

The PWM signal generator may compare the reference voltage with the voltage of the first input.

The PWM signal generating unit may output a voltage having a logic value "1" when the voltage of the first input is higher than the reference voltage, and a logic "0" when the voltage of the first input is lower than the reference voltage. Voltage can be output.

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According to another aspect of the present invention, there is provided a fault diagnosis method for resolvers, comprising: receiving an output signal from a resolver; And outputs the output signal of the resolver to the output voltage adjusting unit when the output signal of the resolver is normal in the input unit and outputs the ground voltage when the output signal of the resolver is a ground signal due to a ground fault step; Amplifying a signal output from the input unit; Generating a PWM signal based on the amplified signal; And determining whether the resolver is abnormal based on the duty ratio of the PWM signal. The step of determining whether the resolver is abnormal may include determining whether the resolver is abnormal, Wherein the controller is configured to divide the duty ratio section into a first section, a second section, a third section and a fourth section, and classify the state of the resolver according to a section of the duty ratio, Wherein the first section is a ground short-circuit abnormality section, the second section is a resolver self-abnormality section, the third section is a normal section, and the fourth section is a normal section, It may be a single-wire fault zone.

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According to the apparatus and method for diagnosing the low side output circuit fault according to the present invention as described above, the normal operation of the resolver, the fault of the ground short circuit, the fault of the short circuit, and the resolver abnormality can be distinguished . Therefore, it is possible to protect the vehicle through detailed fault diagnosis and improve the safety of the vehicle. Of course, the scope of the present invention is not limited by these effects.

1 is a diagram showing the overall configuration of a resolver failure diagnosis apparatus according to an embodiment of the present invention.
Fig. 2 is a view showing a configuration of a resolver. Fig.
3 is a detailed circuit diagram of a resolver failure detection circuit according to an embodiment of the present invention.
4 is a diagram showing the operation of the resolver failure detection circuit in a steady state according to the embodiment of the present invention.
5 is a diagram showing the operation of the resolver failure detection circuit in the single-wire failure state according to the embodiment of the present invention.
6 is a diagram showing the operation of the resolver failure detection circuit in a ground short fault state according to the embodiment of the present invention.
7 is a flowchart illustrating a resolver failure diagnosis method according to an embodiment of the present invention.
8 is a diagram showing a configuration of a resolver output section of the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. In addition, for convenience of explanation, components may be exaggerated or reduced in size.

However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

1 is a diagram showing the overall configuration of a resolver failure diagnosis apparatus according to an embodiment of the present invention. The resolver failure diagnosis apparatus may include a motor unit 300, a resolver failure detection circuit 100, and a microcontroller unit 200. [

The motor unit 300 may include a resolver for detecting the rotational speed of the motor. The resolver will be described in detail with reference to Fig.

The resolver applies a sinusoidal wave of a specific frequency to the primary excitation windings R1-R2 and 320 and outputs the sinusoidal waves of the specific frequency to the output windings S1-S3 (330) and S2-S4 (340) (Sin, cos) having a phase angle of 90 degrees and checking the rotation speed and rotation angle of the motor and whether or not the motor is abnormal. At this time, the secondary side organic windings are configured to have a phase angle of 90 degrees with each other.

For example, when a sinusoidal wave Esinωt is applied to the primary excitation winding (where E is amplitude of sinusoidal wave, ω is angular velocity, t is time), KEsinωt-sinθ (K is amplitude ratio according to winding ratio, θ is the rotation angle of the motor), and a wave of KE sin ωt-cos θ is generated in the second organic winding. Therefore, the rotation angle of the motor can be calculated through the waveform induced in the organic windings.

Referring again to FIG. 1, the resolver failure detection circuit 100 receives the outputs (REZ_S1 input, REZ_S2 input, REZ_S3 input, and REZ_S4 input) of the secondary side organic winding of the resolver and applies it to a pulse width modulation REZ_MON_S1, REZ_ON_S2, REZ_ON_S3, and REZ_ON_S4) and outputs the converted signals.

The output PWM signal is input to the microcontroller unit 200. The microcontroller unit 200 can check whether the resolver output is faulty based on the duty ratio of the PWM signal.

Hereinafter, the resolver failure detection circuit 100 according to the embodiment of the present invention will be described in detail with reference to FIG.

The resolver failure detection circuit 100 may include an input unit 110, an output voltage adjustment unit 120, and a PWM signal generation unit 130.

The input unit 110 may include an input capacitor C1, a NOT buffer 112 and a ground short detection transistor 114. The input unit 110 receives one of the resolver outputs as an input and transmits the received resolver output to the output voltage adjuster 120 .

The input capacitor C1 may block the DC component of the sinusoidal output of the resolver. If there is no failure in the resolver output, the sinusoidal output of the resolver is transmitted to the output voltage adjuster 120 through the input capacitor C1 .

The NOT buffer 112 and the ground short detection transistor 114 enable the ground voltage to be transmitted to the output voltage regulator 120 when there is a ground short fault at the corresponding resolver output.

More specifically, in a state in which there is no short-circuit fault, the voltage is applied to the NOT buffer 112, so that the short-circuit detection transistor 114 is not turned on. However, when there is a short-circuited-to-ground fault, no voltage is applied to the NOT buffer 112, so that "1" is output to the output of the NOT buffer 112 and the ground short detection transistor 114 is turned on. In this case, the input node of the output voltage adjusting unit 120 is directly connected to the ground, so that the input unit 110 can transmit the ground voltage to the output voltage adjusting unit 120.

The output voltage adjusting unit 120 includes a plurality of resistors R1 to R4 and an operational amplifier OP-AMP 126. The output voltage adjusting unit 120 adjusts the amplification ratio according to the size of the plurality of resistors R1 to R4, And can output the adjusted voltage to the signal generating unit 130.

The PWM signal generating unit 130 includes a reference voltage generating unit 132 and a comparator 134 and is capable of generating a PWM signal based on the adjusted voltage received from the output voltage adjusting unit 120.

Hereinafter, the operation of the resolver failure diagnosis apparatus according to the embodiment of the present invention will be described in detail with reference to FIG. 4 to FIG.

4 is a diagram showing the operation of the resolver failure diagnosis apparatus according to the embodiment of the present invention in a normal state without a failure.

Referring to FIG. 4, in the steady state, a sinusoidal wave, that is, a sine wave, is inputted as an output signal of the resolver. The ground short detection transistor 114 is not turned on by the NOT buffer 112 in the normal state. Therefore, the sinusoidal wave is inputted to the output voltage adjusting unit 120 through the input capacitor C1.

In the output voltage adjusting unit 120, a sinusoidal wave having an offset of the bias voltage V1 is applied to the input of the operational amplifier 126 by the bias voltage V1 and the resistors R1 and R2. The first offset voltage applied to the input of the operational amplifier 126 is expressed by Equation (1).

The signal amplified by the operational amplifier 126 and the resistors R3 and R4 is then applied to the first input of the comparator 134. The waveform of the diagnostic voltage (A signal) input to the first input is as shown by the A signal in FIG. And the offset voltage of the first input of the comparator 134 is given by Equation (2).

Meanwhile, the reference voltage generator 132 is applied with a voltage by a voltage divider formed by resistors R5 and R6. The reference voltage (B signal) is shown in Equation (3).

At this time, the comparator 134 compares the reference voltage, the second offset voltage, and the resolver output voltage with the synthesized diagnostic voltage (A signal) to generate the same PWM signal as the C signal of FIG. In this case, when the diagnostic voltage (A signal) is lower than the second offset voltage (B signal), a signal of logic value "0" A signal having a logical value "1" is output.

In designing, the reference voltage is designed so that the relation between the first offset voltage> the reference voltage> the second offset voltage is formed. In this case, the PWM signal (C signal) has a duty ratio of 50% or more.

 On the other hand, the wiring between the resolver output and the resolver failure diagnosis circuit 100 can be disconnected for various reasons such as connector failure, wiring breakage, and the like. Hereinafter, the case of the single-wire fault diagnosis will be described with reference to FIG.

5, the input terminal 110 is in a floating state and a bias voltage V1 is applied to the input of the operational amplifier 126 when a single wire failure occurs.

In this case, the diagnostic voltage applied to the first input of the comparator 134 is given by Equation (4).

Since the diagnostic voltage at this time is always higher than the reference voltage expressed by Equation (3), the output of the comparator 134 becomes a PWM signal having a duty ratio of 100% as the C signal of FIG.

On the other hand, the wiring between the output of the resolver and the resolver failure diagnosis circuit 100 may cause a short to ground due to various reasons such as connector failure, peeling of the wiring cover, and the like. Hereinafter, the ground short fault detection will be described with reference to FIG.

Referring to FIG. 6, when a ground short fault occurs, 0 V is applied to the input terminal 110. In this case, the ground short detection transistor 114 is turned on by the NOT buffer 112, and the second offset voltage of Equation (2) is input to the first input of the comparator 134.

Since the second offset voltage is always lower than the reference voltage of Equation (3), the output of the comparator 134 becomes a PWM signal having a duty ratio of 0% like the C signal of FIG.

Therefore, when the diagnostic voltage (C signal) shown in FIGS. 4 to 6 is input to the microcontroller unit 200, the microcontroller unit 200 determines whether or not the failure has occurred based on the duty ratio of the input signal, It can be judged.

Hereinafter, a resolver failure diagnosis method according to an embodiment of the present invention will be described in detail with reference to FIG.

Initially, upon startup, the resolver failure detection circuit 100 receives a signal from the resolver. That is, the resolver generates an excitation signal and outputs an output signal corresponding to the rotation of the motor to the resolver failure diagnosis circuit 100 (S710).

Thereafter, the resolver failure detection circuit 100 generates a PWM signal based on the output signal of the resolver received from the resolver (S720).

The microcontroller unit 200 receives the generated PWM signal, divides the generated PWM signal into at least four sections according to the duty ratio, and checks the state of the reso voltage according to the section.

The first section may be judged to be a ground short circuit abnormality, the second section may be judged to be a resolvo abnormal section, the third section may be judged to be a normal section, and the fourth section may be judged to be a short circuit failure. These four sections are the sections arranged in order from the smallest to the largest duty ratio.

For example, if the duty ratio is between 50% and 90%, the microcontroller unit 200 determines that the duty ratio is normal and ends the inspection (S730, S740).

Thereafter, when the duty ratio is between 0% and 10%, the microcontroller unit 200 determines that the ground fault is present and ends the inspection (S750, S760).

If the duty ratio is between 90% and 100%, the microcontroller unit 200 determines that the wire breakage is a failure and terminates the inspection (S770 and S780).

If the duty ratio is between 10% and 40%, the microcontroller unit 200 determines that the resolver is in an abnormal state and ends the inspection (S770, S780).

Therefore, according to the present invention, resolver normal operation, ground short fault, single wire fault, and resolver abnormality can be distinguished by subdividing the fault diagnosis into the existing fault. Therefore, it is possible to protect the vehicle through detailed fault diagnosis and improve the safety of the vehicle. Of course, the scope of the present invention is not limited by these effects.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

100: Resolver fault detection circuit
110: input unit
120: Output voltage adjuster
130: PWM signal generating unit
200: Microcontroller unit
300:

Claims (11)

A motor section including a resolver;
A resolver failure detecting circuit including an input for receiving an output of the resolver, an output voltage adjusting unit for amplifying the output of the resolver, and a PWM signal generating unit for generating a PWM signal based on the output of the output voltage adjusting unit. And
And a microcontroller unit for determining whether the resolver is abnormal based on a duty ratio of the output signal of the PWM signal generator,
The microcontroller unit divides the duty ratio section into at least a first section, a second section, a third section and a fourth section according to the duty ratio so as to determine whether the resolver is abnormal, Wherein the first to fourth sections are arranged in a size order from the smallest to the largest,
Wherein the first section is a ground short-circuit abnormality section, the second section is a section of the resolver itself itself, the third section is a normal section, and the fourth section is a short-
Resolver Fault Diagnosis Device.
The method according to claim 1,
Wherein the input buffer includes a NOT buffer and a short-circuit detection transistor, and when the short-circuit fault occurs, the NOT buffer turns on the short-circuit detection transistor to input a ground voltage to the output voltage regulation unit,
Resolver Fault Diagnosis Device.
The method according to claim 1,
Wherein the output voltage adjusting unit includes a bias voltage and an operational amplifier,
Wherein the output of the resolver is biased by the bias voltage, amplified by the operational amplifier, and applied to the PWM signal generator,
Resolver Fault Diagnosis Device.
The method according to claim 1,
The PWM signal generator includes a reference voltage generator and a comparator. The output of the output voltage adjuster is applied to the first input of the comparator, and the reference voltage generated by the reference voltage generator is applied to the second input of the comparator. felled,
Resolver Fault Diagnosis Device.
5. The method of claim 4,
Wherein the PWM signal generator compares the reference voltage with the voltage of the first input,
Resolver Fault Diagnosis Device.
5. The method of claim 4,
The PWM signal generating unit outputs a voltage having a logic value "1" when the voltage of the first input is higher than the reference voltage, and a voltage having a logic "0" when the voltage of the first input is lower than the reference voltage Outputting,
Resolver Fault Diagnosis Device.
delete delete Receiving an output signal from the resolver;
And outputs the output signal of the resolver to the output voltage adjusting unit when the output signal of the resolver is normal in the input unit and outputs the ground voltage when the output signal of the resolver is a ground signal due to a ground fault step;
Amplifying a signal output from the input unit;
Generating a PWM signal based on the amplified signal; And
And determining whether the resolver is abnormal based on the duty ratio of the PWM signal,
Wherein the step of determining the abnormality of the resolver includes dividing the interval of the duty ratio into at least a first section, a second section, a third section and a fourth section according to the duty ratio so as to determine whether the resolver is abnormal, Wherein the controller is configured to classify the state of the resolver according to a duration of the duty ratio, wherein the first period to the fourth period are intervals ranging from a small size to a large size,
Wherein the first section is a ground short-circuit abnormality section, the second section is a section of the resolver itself itself, the third section is a normal section, and the fourth section is a short-
Resolver fault diagnosis method.
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