Apparatus for diagnosing faults in drive motor signal lines and method using thereof

Abstract

The present invention relates to a method for diagnosing a fault in a drive motor signal line. The method for diagnosing a fault in a drive motor signal line comprises the steps of: converting a sensor signal into an inverted sensor signal in an initial state where power is applied; converting the sensor signal into a normal sensor signal when power reaches a normal state; and diagnosing whether the signal line is faulty by checking a phase change between the inverted sensor signal and the normal sensor signal.

Description

Technology Field

[0001] The present invention relates to a drive motor signal line fault diagnosis device and a drive motor signal line fault diagnosis method using the same. Background Technology

[0003] Sensors are used to control the operation of electric motors and determine the driving position. However, if the sensor signal line is disconnected or short-circuited, it can affect the normal operation of the motor, which may cause problems with the safety and performance of the drive system.

[0004] Previously, voltage and current were measured only when the motor was running, allowing for the diagnosis of the sensor signal line. Consequently, the status of the sensor signal line could not be diagnosed when the motor was not operating.

[0005] As a result, in situations where the motor is stopped or cannot be driven, the status of the sensor signal line cannot be quickly determined, which may cause problems with the stability of the system. (Patent Document 1) JP 05-199110 A (Patent Document 2) US 4967107 B (Patent Document 3) JP 59-228426 B (Patent Document 4) KR 10-1998-0076031 A (Patent Document 5) US 20110279103 A The problem to be solved

[0007] The present invention is proposed to solve the aforementioned problems and aims to provide a drive motor signal line fault diagnosis device and method capable of effectively diagnosing a drive motor signal line even when the motor is not in operation. means of solving the problem

[0009] A method for diagnosing a fault in a drive motor signal line according to an embodiment of the present invention includes: (a) a step of converting a sensor signal into an inverted sensor signal in an initial state where power is applied; (b) a step of converting a sensor signal into a normal sensor signal when power reaches a normal state; and (c) a step of diagnosing whether the signal line is faulty by checking for a phase change between the inverted sensor signal and the normal sensor signal.

[0010] In step (a) above, if the inversion output condition is satisfied through the signal comparator, the sensor signal is converted into an inversion sensor signal through the signal conversion unit.

[0011] The charging time of the capacitor is determined by the capacitor and resistor connected to the input terminal of the signal comparator, and during the charging time, the signal comparator satisfies the inversion output condition.

[0012] In step (b) above, if the normal output condition is satisfied through the signal comparator, the sensor signal is converted into a normal sensor signal through the signal conversion unit.

[0013] When the power reaches a steady state after the charging time of the capacitor due to the capacitor and resistor connected to the input terminal of the signal comparator, the signal comparator satisfies the normal output condition.

[0014] Step (c) above checks for a phase change between the inverted sensor signal and the normal sensor signal using a control unit.

[0015] The above inverted sensor signal outputs the A, B, and I signals of the ABI sensor by inverting them, and the above normal sensor signal outputs the A, B, and I signals of the ABI sensor without inversion when the power reaches a normal state.

[0016] The duration of the inversion sensor signal output can be determined through a timer set in the initial state of power application.

[0017] Step (c) above checks for a phase change between the inverted sensor signal and the normal sensor signal after the duration of the inverted sensor signal output has elapsed, and if the duration of the inverted sensor signal output has been exceeded, it can be determined as a fault.

[0018] Step (c) above can determine that there is no phase change between the inverted sensor signal and the normal sensor signal, and can warn the system of this.

[0019] A driving motor signal line fault diagnosis device according to an embodiment of the present invention includes a signal comparator that satisfies an inverted output condition in an initial state where power is applied and satisfies a normal output condition when power reaches a normal state, a signal conversion unit that converts a sensor signal into an inverted sensor signal or a sensor signal into a normal sensor signal according to the output condition of the signal comparator, and a control unit that monitors the inverted sensor signal and the normal sensor signal output from the signal conversion unit and diagnoses whether there is a fault in the signal line by checking the phase change between them.

[0020] The above signal comparator has a capacitor and a resistor connected to the input terminal, the charging time of the capacitor is determined, and during the charging time, it satisfies the inversion output condition.

[0021] The above signal comparator satisfies the normal output condition when the charging time of the capacitor has elapsed and the power reaches a normal state.

[0022] The control unit above checks for a phase change between the inverted sensor signal and the normal sensor signal, and if there is no phase change, it can determine that it is a fault.

[0023] The above inverted sensor signal outputs the A, B, and I signals of the ABI sensor by inverting them, and the above normal sensor signal can output the A, B, and I signals of the ABI sensor without inversion when the power reaches a normal state.

[0024] The output duration of the inversion sensor signal can be determined through a timer set in the initial state of power application.

[0025] The control unit can check for a phase change between the inversion sensor signal and the normal sensor signal after the output duration of the inversion sensor signal has elapsed, and determine that it is a fault if the output duration of the inversion sensor signal is exceeded.

[0026] The control unit above can monitor the phase change between the inverted sensor signal and the normal sensor signal, and output a warning signal to the system if there is no phase change. Effects of the invention

[0028] According to the present invention, sensor signal lines can be effectively diagnosed even when the motor is not in operation, allowing for the rapid identification of faults such as open circuits or short circuits in the sensor signal lines.

[0029] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below. Brief explanation of the drawing

[0031] FIG. 1 illustrates a method for diagnosing a fault in a driving motor signal line according to an embodiment of the present invention. FIG. 2 illustrates a schematic diagram of a drive motor signal line fault diagnosis device according to an embodiment of the present invention. FIG. 3 illustrates a fault diagnosis process in a drive motor signal line fault diagnosis method according to an embodiment of the present invention, by comparing the phase change between an inverted sensor signal and a normal sensor signal. FIG. 4 illustrates the operation process of a signal comparator that satisfies capacitor charging and inversion output conditions when power is applied, and satisfies normal output conditions in a normal power state, in a drive motor signal line fault diagnosis device according to an embodiment of the present invention. FIG. 5 specifically illustrates a method for diagnosing a driving motor signal line fault according to an embodiment of the present invention. FIG. 6 illustrates the initial value and state of the ABI signal of a drive motor in a drive motor signal line fault diagnosis method according to an embodiment of the present invention. FIG. 7 illustrates a drive motor signal line fault diagnosis device (a) according to an embodiment of the present invention and a prior art (b). FIG. 8 is a block diagram showing a computer system for implementing a method according to an embodiment of the present invention. Specific details for implementing the invention

[0032] The aforementioned objectives of the present invention, as well as other objectives, advantages, and features, and the methods for achieving them, will become clear from the embodiments described in detail below together with the accompanying drawings.

[0033] However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms, and the following embodiments are provided merely to easily inform those skilled in the art of the purpose, structure, and effects of the invention, and the scope of the rights of the present invention is defined by the description in the claims.

[0034] Meanwhile, the terms used in this specification are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0036] FIG. 1 illustrates a method for diagnosing a driving motor signal line fault according to an embodiment of the present invention, and FIG. 2 illustrates a schematic diagram of a driving motor signal line fault diagnosis device according to an embodiment of the present invention.

[0037] A method for diagnosing a fault in a drive motor signal line according to an embodiment of the present invention comprises, in the method for diagnosing a fault in a drive motor signal line, a step (S710) of converting a sensor signal into an inverted sensor signal in an initial state where power is applied, a step (S720) of converting a sensor signal into a normal sensor signal when power reaches a normal state, and a step (S730) of diagnosing whether the signal line is faulty by checking a phase change between the inverted sensor signal and the normal sensor signal.

[0039] Step of converting the sensor signal into an inverted sensor signal in the initial state where power is applied

[0040] First, the sensor signal is converted into an inverted sensor signal in the initial state where power is applied (S710).

[0041] This is performed when power is first applied to the drive motor, and by intentionally inverting the sensor signal when power is applied and outputting it, the signal line status can be diagnosed even when the motor is not driven.

[0042] The sensor in the present invention detects the operating state of the drive motor, and an ABI sensor may be used. The ABI sensor is a sensor that detects the operating state of the motor, such as the position, rotation direction, and rotation speed of the drive motor. It serves to generate three output signals, A, B, and I, and transmit them to the control unit.

[0043] In such ABI sensors, the A and B signals represent the position and rotation direction of the drive motor, and are generated in the form of pulses with a phase difference of 90 degrees. When rotating one full revolution, A and B each generate a constant pulse, and the direction of rotation can be determined by their phase difference.

[0044] The I signal is an index pulse that occurs once per full rotation of the motor and serves as a reference point indicating the motor's absolute position; it is used in conjunction with signals A and B to determine the motor's precise location.

[0045] According to an embodiment of the present invention, sensor signals A, B, and I are inverted according to the charge state of the signal comparator and capacitor described later in the initial state where power is applied, and are output as inverted sensor signals A', B', and I'.

[0046] For example, if A=0, B=1, and I=0, the output in the inverted state is A'=1, B'=0, and I'=1. At this point, the inverted sensor signal prepares the system to check for any abnormalities in the sensor signal from the initial state.

[0047] The signal comparator for converting the sensor signal into an inverted sensor signal operates according to the charge state of the capacitor. When power is initially applied, the capacitor is not fully charged, so the output of the signal comparator is set to satisfy the inverted output condition. As a result, the sensor signal is output in an inverted state.

[0049] Step of converting the sensor signal to a normal sensor signal when the power reaches a normal state

[0050] When the power reaches a normal state, the sensor signal is converted to a normal sensor signal (S720).

[0051] This is performed after a certain period of time has passed since power was applied, when the power supply stabilizes and reaches a normal state; when the capacitor is fully charged and the signal comparator satisfies the normal output conditions, the sensor signal switches back to the normal state.

[0052] Previously, the inverted sensor signal (A', B', I') is converted into the normal sensor signal (A, B, I), and the normal sensor signal represents the original sensor state without inversion, reflecting the motor's current position and rotation state.

[0053] For example, when charging is complete and the system switches to a normal state, A'=1, B'=0, and I'=1 are converted back to A=0, B=1, and I=0. This corresponds to the process of converting into the precise position and rotation information required for motor operation.

[0054] When the capacitor is fully charged, the output of the signal comparator switches to a normal state (normal output condition) based on the comparison result between V- and V+ at the input terminal, and the sensor signal is output normally. Through this transition, it becomes possible to perform fault diagnosis by distinguishing between the inversion and normal states of the sensor signal.

[0056] A step of diagnosing whether the signal line is faulty by checking the phase change between the inverted sensor signal and the normal sensor signal.

[0057] The phase change between the inverted sensor signal and the normal sensor signal is checked to diagnose whether the signal line is faulty (S730).

[0058] The control unit (MCU) compares the phase change between the inverted sensor signal and the normal sensor signal, and determines whether a fault exists by checking whether the phase change occurred normally and whether the change matches the expected pattern.

[0059] For example, if a phase shift occurs between signals A', B', and I' in the inverting section and signals A, B, and I in the non-inverting section, it is determined to be normal. However, if inversion does not occur properly in the inverting section, or if there is no phase shift when switching to the non-inverting section, it is determined to be a fault such as an open circuit or short circuit in the signal line.

[0060] Here, if the phase fluctuation does not occur as expected or is abnormal, the control unit determines this as a fault and can output a warning signal, etc. to the system.

[0062] According to an embodiment of the present invention, step S710, which converts a sensor signal into an inverted sensor signal in an initial state where power is applied, converts the sensor signal into an inverted sensor signal through a signal conversion unit when the inverted output condition is satisfied through a signal comparator.

[0063] A signal comparator according to an embodiment of the present invention determines the state of a sensor signal and checks whether the inversion output condition is satisfied in the initial state when power is applied.

[0064] The signal comparator determines the inversion output condition using the difference in voltage set through the capacitor and resistor, and when the capacitor starts to charge after power supply is applied, the output changes according to the voltage difference between the two input terminals (V+, V-) of the signal comparator.

[0065] When power is applied, the capacitor begins to charge, and as time passes, the voltage of V- rises. Initially, since the voltage of the capacitor is low, V- remains lower than V+. In this state, the output of the signal comparator satisfies the inversion output condition, and this condition sets Vout in the signal comparator (OP Amp) to 1, causing the sensor signal to switch to an inverted state.

[0066] The signal switching unit enables the switching of the sensor signal according to the output state of the signal comparator, and when the signal comparator satisfies the inversion output condition, the signal switching unit converts the sensor signal into an inverted sensor signal.

[0067] For example, assuming that power is applied to the drive motor and the initial state of the sensor signal is A = 0, B = 1, and I = 0, the capacitor is charging in the initial state of power supply application, so the V- voltage is low and the output of the signal comparator satisfies the inverted output condition. As a result, the signal converter inverts the sensor signal and outputs A' = 1, B' = 0, and I' = 1.

[0068] This inverted state is maintained for a certain period of time, and thereafter, when the capacitor is fully charged, the signal comparator satisfies the normal output condition, and the sensor signal switches back to the normal state. By comparing the sensor signal in the inverted state with the sensor signal in the normal state, it is verified whether the phase change occurred correctly.

[0069] If the expected phase fluctuation does not occur in the inversion and normal sections, it is determined to be a signal line fault (open circuit or short circuit, etc.), and the system outputs a warning.

[0070] According to an embodiment of the present invention, the charging time of a capacitor is determined by a capacitor and a resistor connected to the input terminal of a signal comparator, and during the charging time, the signal comparator satisfies an inversion output condition.

[0071] According to one embodiment of the present invention, a capacitor and a resistor are connected to the input terminal of a signal comparator, and this circuit configuration controls the charging / discharging time of the capacitor, and the charging time of the capacitor is determined by the characteristics of the RC circuit. The charging time of the capacitor is determined by the capacitance of the capacitor and the value of the resistor, and this time affects the time during which the inversion output condition is maintained.

[0072] According to an embodiment of the present invention, when power is applied, the capacitor begins to be charged through the resistor, and during this charging time, the output of the signal comparator is determined by the voltage difference at the input terminal of the signal comparator.

[0073] Initially, because the capacitor's charging voltage is low, the signal comparator satisfies the inversion output condition, and this condition causes the sensor signal to be output in an inverted state.

[0074] That is, if the voltage of the capacitor is low at the time of initial power supply application, the signal comparator output (Vout) becomes 1, satisfying the inversion output condition, and at this time, the signals A, B, and I are inverted into signals A', B', and I' and output.

[0075] As time passes, the charging voltage of the capacitor increases, and when charging is complete, the output of the signal comparator switches to a normal output condition, which causes the voltages at the two input terminals of the signal comparator to convert the door sensor signal into a normal sensor signal.

[0076] At this time, the charging time of the capacitor determines the period during which the inverted output phase is maintained, and during this period, the phase fluctuation of the inverted sensor signal is monitored.

[0078] According to an embodiment of the present invention, step S720 converts the sensor signal into a normal sensor signal through a signal conversion unit when the normal output condition is satisfied through a signal comparator.

[0079] In addition, according to an embodiment of the present invention, when the power reaches a normal state after the charging time of the capacitor by the capacitor and resistor connected to the input terminal of the signal comparator, the signal comparator satisfies the normal output condition.

[0080] While the capacitor connected to the input of the signal comparator is charging, the signal comparator satisfies the initial inverted output condition; however, once the capacitor is fully charged after a certain period of time, the input voltage condition of the signal comparator changes. At this point, if the voltage (V-) generated by the capacitor becomes higher than the reference voltage (V+) in the comparator, the normal output condition is satisfied.

[0081] The normal output condition means that the power has stabilized and the point has been reached where the sensor signal can be restored to a normal state. When the normal output condition is met based on the voltage of the charged capacitor, the signal comparator's output switches to 0. As a result, the system switches from the inverted sensor signal to the normal sensor signal.

[0082] Here, when the normal output condition is satisfied, the signal switching unit switches the sensor signal from an inverted state to a normal state, and through this switching, outputs the original sensor signals A, B, and I. That is, when power is initially applied, intentionally inverted sensor signals (A', B', I') are generated, but when the normal output condition is satisfied, the signal is switched back to a normal sensor signal by the signal switching unit.

[0083] By switching to this normal sensor signal, the system reflects the actual motor's rotational position and speed information, and the sensor signal switched from the inverted state to the normal state compares the phase fluctuation and then checks whether the phase fluctuation occurred normally to diagnose whether there is a fault in the signal line.

[0085] According to an embodiment of the present invention, the duration of the inversion sensor signal output is determined through a timer set in the initial state of power application. The initial state of power application is the point in time when charging of the capacitor begins and the inversion sensor signal begins to be output, and the timer is set in this initial state for the inversion sensor signal to be continuously output.

[0086] That is, the charging time of the capacitor after power is applied determines the period during which the inversion state is maintained, and this period lasts for a set period of time set by a timer. The timer determines the period from when to when the inversion sensor signal is maintained and ensures that the sensor signal can be stably transmitted for a sufficient inversion time.

[0087] A timer according to one embodiment of the present invention starts counting from the moment power is applied and maintains an inverted sensor signal until a set time has elapsed. During this time, the sensor signals (A, B, I) are output in an inverted state (A', B', I'), and the system monitors the signal state until the power is stabilized and the charging of the capacitor is completed. When the time set in the timer has elapsed, the inverted state ends and the sensor signal switches to a normal state.

[0088] A timer according to an embodiment of the present invention is set to match or be close to the charging time of a capacitor, so that the output condition of the signal comparator can be switched to a normal output condition at the time of completion of charging.

[0089] By setting the timer according to the embodiment of the present invention as described above, the time for which the inverted sensor signal is output can be controlled. This allows the state of the sensor signal to be maintained in an inverted state for a certain period of time when power is initially applied, thereby enabling accurate comparison of the phase fluctuation between the two signals when transitioning to a normal state. In other words, by maintaining the inverted state sufficiently, malfunctions caused by voltage fluctuations or noise during the initial power application are prevented, and accurate fault diagnosis is ensured.

[0090] For example, when power is applied, a timer built into the control unit starts and maintains the inverted sensor signal for a certain period of time. When the time set in the timer elapses, the capacitor is fully charged, and the output condition of the signal comparator switches to a normal state, causing the sensor signal to return to the normal state of A, B, and I. At this point, the control unit can determine whether there is a fault by checking the phase change between the inverted sensor signal and the normal sensor signal.

[0092] According to an embodiment of the present invention, after the duration of the inversion sensor signal output has elapsed, a phase change between the inversion sensor signal and the normal sensor signal is checked, and if the duration of the inversion sensor signal output has been exceeded, it is determined to be a fault.

[0093] As described above, when power is applied, a timer is set, and this timer controls the time during which the sensor signal maintains an inverted state. When the duration of the inverted sensor signal output set in the timer elapses, the system switches to a fully charged state of the capacitor and outputs a normal sensor signal, at which time the control unit checks for a phase change between the inverted sensor signal and the normal sensor signal.

[0094] Accordingly, if an expected phase fluctuation occurs between the inverted sensor signal and the normal sensor signal, the signal line is determined to be normal; if no phase fluctuation occurs or a pattern different from the expected fluctuation appears, it is determined that the sensor signal line is fixed.

[0095] If the output duration of the inverted sensor signal set by the timer is exceeded, it indicates a problem with the sensor signal line; if the inverted state persists at the point when it should generally switch to a normal state, this may indicate a failure to charge the capacitor, a malfunction of the signal comparator, or a defect in the signal line itself.

[0096] Therefore, in such cases, the system may determine this as a fault and output a fault warning signal or enter safe mode.

[0098] FIG. 2 illustrates a schematic diagram of a drive motor signal line fault diagnosis device according to an embodiment of the present invention. As shown in FIG. 2, the drive motor (10) signal line fault diagnosis device according to an embodiment of the present invention includes a signal comparator (100) that satisfies an inverted output condition in an initial state where power (20) is applied and satisfies a normal output condition when power (20) reaches a normal state, a signal conversion unit (200) that converts a sensor signal into an inverted sensor signal or a normal sensor signal according to the output condition of the signal comparator (100), and a control unit (300) that monitors the inverted sensor signal and the normal sensor signal output from the signal conversion unit (200) and diagnoses whether the signal line (40) is faulty by checking the phase change between them.

[0099] A signal comparator (100) according to an embodiment of the present invention satisfies an inverted output condition in an initial state where power (20) is applied, and satisfies a normal output condition when power (20) reaches a normal state.

[0100] Additionally, the signal comparator (100) has a capacitor (120) and a resistor (140) connected to its input terminal, and the charging time of the capacitor (120) is determined. During the charging time, the inverted output condition is satisfied, and when the charging time of the capacitor (120) elapses and the power reaches a normal state, the normal output condition is satisfied.

[0101] In the initial state where power is applied, the signal comparator (100) according to the embodiment of the present invention is lower than the reference voltage (V+) of the signal comparator (100), and as a result, the output of the signal comparator (100) remains in an inverted state. When the power reaches a normal state, that is, after the capacitor (120) is fully charged, the normal output condition is satisfied, and at this time, the output of the signal comparator (100) switches to a normal state, and the sensor signal returns to its original state.

[0102] That is, the signal comparator (100) determines two output conditions (inverted and normal) based on the time when power (20) is applied, thereby inverting the sensor signal from the initial state and switching to the normal state when charging is complete and the power is stabilized.

[0104] The signal switching unit (200) according to an embodiment of the present invention performs the function of switching the sensor signal to an inverted or normal state according to the output condition of the signal comparator (100). When the signal comparator (100) satisfies the inverted output condition in the initial state where power is applied, the signal switching unit (200) inverts the sensor signal (A, B, I) and outputs it as A', B', I'. When the power is stabilized and the signal comparator (100) satisfies the normal output condition, the signal switching unit (200) restores the sensor signal to its original state (A, B, I).

[0105] That is, the signal switching unit (200) inverts the sensor signal at an appropriate time or switches it to a normal state, so that the control unit (300) can compare the phase change between the inverted state and the normal state, thereby accurately detecting whether there is an abnormality in the signal line (40).

[0107] A control unit (300) according to an embodiment of the present invention continuously monitors the inverted sensor signal and the normal sensor signal output from the signal conversion unit (200), and diagnoses the state of the signal line (40) by checking the phase shift between the two signals. If a normal phase shift is confirmed, the signal line is determined to be normal, and if there is no phase shift or it is different from what is expected, it is determined to be faulty.

[0108] Additionally, if the system does not switch to a normal state even after the inversion sensor output time has passed, or if the phase fluctuation is abnormally small or non-existent, the control unit (300) diagnoses this as a fault in the signal line and outputs a warning signal to the system.

[0109] In addition, the output duration of the inversion sensor signal is determined through a timer set in the initial state of power application via the control unit (300), and after the output duration of the inversion sensor signal has elapsed, a phase change between the inversion sensor signal and the normal sensor signal is checked, and if the output duration of the inversion sensor signal is exceeded, it is determined to be a fault.

[0111] As such, the drive motor signal line fault diagnosis device according to an embodiment of the present invention includes a signal comparator (100), a signal switching unit (200), and a control unit (300), and performs the function of accurately diagnosing a fault in the signal line by monitoring sensor signals in an inverted state and a normal state from the time power is applied. This enables safe and reliable system operation by identifying whether there is an abnormality in the signal line even if the motor (10) is not driven.

[0113] FIG. 3 is a schematic diagram illustrating a fault diagnosis process by comparing phase fluctuations between an inverted sensor signal and a normal sensor signal in a drive motor signal line fault diagnosis method according to an embodiment of the present invention. FIG. 4 illustrates the operation process of a signal comparator that satisfies capacitor charging and inverted output conditions when power is applied, and satisfies normal output conditions in a normal power state, in a drive motor signal line fault diagnosis device according to an embodiment of the present invention.

[0114] As described above, when the power supply (20) is applied, the capacitor (120) and the resistor (140) form a charging circuit, and the capacitor (120) is gradually charged through the V- terminal. Accordingly, the V- voltage increases, and this voltage is transmitted to the input of the signal comparator (100). The V+ voltage represents the reference voltage of the signal comparator (100) and is maintained at a constant level, and when the charging of the capacitor (120) begins, V- remains in a state lower than V+, at which time the output of the signal comparator (100) satisfies the inversion output condition.

[0115] While the capacitor (120) is being charged after the initial power is applied, the output Vout of the signal comparator (100) remains in the state of 1 because V- is lower than V+, and when the charging of the capacitor (120) is completed and V- becomes greater than V+, the output of the signal comparator (100) switches to 0. Through this, the sensor signal switches from an inverted state to a normal state.

[0116] In the inverting section where Vout is 1, the sensor signal is inverted using the signal conversion unit (XOR gate) (200) by the output of the signal comparator (100). That is, when A=0, A=1 is output, and the B and I signals are also inverted and output as B' and I', respectively. In the non-inverting section where the capacitor (120) is fully charged and Vout becomes 0, the sensor signal is switched to a normal state and output as A, B, and I signals.

[0117] During this process, a phase change occurs between the inverted sensor signal and the normal sensor signal, and by checking whether this phase change is normal, the fault of the signal line (40) can be diagnosed.

[0119] FIG. 5 specifically illustrates a method for diagnosing a fault in a drive motor signal line according to an embodiment of the present invention.

[0120] When power supply starts and the microcomputer boots up, capacitor charging begins in the initial state of power application (S810).

[0121] A timer for checking the inversion time, that is, a timer for determining the duration of the inversion sensor signal output, is set (S820).

[0122] ABI sensor signal reading and sensor signal inversion are performed (S830).

[0123] Check the elapsed time of the inversion output duration (inversion interval time) (S840).

[0124] When the inverted output duration has elapsed, the normal switching of the ABI sensor signal is performed (S850).

[0125] Check for a phase change between the inverted and normal sensor signals (S860), determine if the phase has changed (S870), determine if the fault is not detected, send a warning to the system, and perform a reaction to the fault (S880).

[0126] As such, FIG. 5 illustrates the overall operation process of a drive motor signal line fault diagnosis device, showing the process from the initial state after power is applied until it transitions to a normal state. Through this, the system can quickly diagnose whether a fault exists and ensure reliable motor operation.

[0128] As described, signals A and B each consist of 512 pulses, covering a mechanical angle of 360 degrees when the motor rotates one full revolution, and the position of the motor can be determined through the phase difference between A and B. Pulse I is a signal that occurs only once during one full revolution and indicates the reference position of the motor.

[0129] When power is first applied, the initial value of the ABI sensor is determined based on the position of the motor. For example, it can be initialized to a state of A=0, B=1, and I=0, which is a signal value based on the current position of the motor, and the signal pattern at this point defines the initial state of the system.

[0130] In the existing method, it was difficult to verify whether signals A, B, and I were currently in a normal state because the criteria for determining whether the initial signal state was normal were unclear and the location of the motor was unknown.

[0131] The inversion method applied in the present invention utilizes a signal comparator and a signal converter after power is applied, so that the sensor signal is output in an inverted state (A'=1, B'=0, I'=1) after the initial power is applied. In this state, when charging is completed and the normal output condition is satisfied, it is switched back to a normal signal, becoming A=0, B=1, I=0.

[0132] Then, the control unit determines whether the signal line is faulty through the phase change between the inverted state signals (A', B', I') and the normal state signals (A, B, I).

[0133] For example, if the initial values ​​are A = 0, B = 1, I = 0 and the inverted state is switched to A' = 1, B' = 0, I' = 1, and then returns to the normal state of A = 0, B = 1, I = 0, this is considered normal. However, if an abnormal phase change different from the expected occurs during this conversion process, such as A' = 0, B' = 1, I' = 0, this is considered a faulty state.

[0134] As such, according to an embodiment of the present invention, by comparing the phase fluctuation between the inverted state and the normal state signal, it is possible to determine whether the signal line is faulty, and this allows for the diagnosis of the signal line's condition regardless of changes in the motor's position. In addition, since the phase fluctuation is monitored from the point when power is applied until the point when the inverted signal is checked and the signal is switched to the normal state, the fault of the sensor signal line can be detected in real time.

[0136] FIG. 7 illustrates a drive motor signal line fault diagnosis device (a) according to an embodiment of the present invention and a prior art (b).

[0137] As illustrated in FIG. 7(a) and as described above, an embodiment of the present invention includes an ABI sensor, a signal comparator (OP Amp), a signal conversion unit (XOR gate), and a control unit (MCU), and satisfies output conditions through the signal comparator and performs inversion of the sensor signal through the XOR gate.

[0138] That is, an embodiment of the present invention includes a configuration that inverts the ABI sensor signal in the initial state when power is applied, and creates an inverted state of the sensor signal using an XOR gate. From the moment power is applied, the sensor signal is intentionally inverted, and by checking the phase fluctuation between this inverted signal and the normal signal, it is possible to diagnose whether there is an abnormality in the signal line, such as an open circuit or a short circuit.

[0139] As illustrated in FIG. 7(b), the conventional technology has a limitation in that diagnosis is possible only when the motor is driven and rotating. That is, since the normal state of the sensor signal cannot be verified when the motor is not moving, there is a limitation in fault diagnosis. As a result, it is difficult to diagnose the state of the signal line in real time in the initial state of the motor, so it may take time to determine whether there is a fault.

[0141] FIG. 8 is a block diagram showing a computer system for implementing a method according to an embodiment of the present invention.

[0142] Referring to FIG. 8, a computer system (1300) may include at least one of a processor (1313), memory (1330), an input interface device (1350), an output interface device (1360), and a storage device (1340) that communicate via a bus (1370). The computer system (1300) may also include a communication device (1320) coupled to a network. The processor (1310) may be a central processing unit (CPU) or a semiconductor device that executes instructions stored in memory (1330) or a storage device (1340). Memory (1330) and storage device (1340) may include various forms of volatile or non-volatile storage media. For example, memory may include read-only memory (ROM) and random access memory (RAM). In the embodiments of this description, memory may be located inside or outside the processor, and memory may be connected to the processor through various known means. Memory is a volatile or non-volatile storage medium of various forms, and for example, memory may include read-only memory (ROM) or random access memory (RAM).

[0143] The method for diagnosing a fault in a drive motor signal line according to an embodiment of the present invention may include a memory (1330) storing a program capable of operating the device and a processor (1310) that executes the program.

[0144] Accordingly, embodiments of the present invention may be implemented as a method implemented on a computer or as a non-transient computer-readable medium storing computer-executable instructions. In one embodiment, when executed by a processor, the computer-readable instructions may perform a method according to at least one aspect of the present description.

[0145] The communication device (1320) can transmit or receive wired or wireless signals.

[0146] In addition, the method according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and may be recorded on a computer-readable medium.

[0147] The above computer-readable medium may include program instructions, data files, data structures, etc., either individually or in combination. The program instructions recorded on the computer-readable medium may be specially designed and configured for embodiments of the present invention, or they may be known and available to a person skilled in the art of computer software. The computer-readable recording medium may include a hardware device configured to store and execute program instructions. For example, the computer-readable recording medium may be magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; ROM; RAM; flash memory, etc. The program instructions may include not only machine code, such as that generated by a compiler, but also high-level language code that can be executed by a computer through an interpreter, etc.

[0148] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Claims

Claim 1 A method for diagnosing a fault in a drive motor signal line performed by a drive motor signal line fault diagnosis device, comprising: (a) determining the duration of an inverted sensor signal output through a timer set in the initial state of power application, and converting the sensor signal to an inverted sensor signal in the initial state of power application; (b) converting the sensor signal to a normal sensor signal when the power reaches a normal state; and (c) diagnosing whether the signal line is faulty by checking for a phase change between the inverted sensor signal and the normal sensor signal, wherein after the duration of the inverted sensor signal output, the phase change between the inverted sensor signal and the normal sensor signal is checked, and if there is no phase change between the inverted sensor signal and the normal sensor signal, it is determined to be a fault and a warning is given to the system, and if the duration of the inverted sensor signal output is exceeded, it is determined to be a fault. Claim 2 A method for diagnosing a fault in a drive motor signal line according to claim 1, wherein step (a) converts the sensor signal into an inverted sensor signal through a signal conversion unit when the inverted output condition is satisfied through a signal comparator. Claim 3 A method for diagnosing a fault in a driving motor signal line according to claim 2, wherein the charging time of the capacitor is determined by the capacitor and the resistor connected to the input terminal of the signal comparator, and during the charging time, the signal comparator satisfies the inversion output condition. Claim 4 A method for diagnosing a fault in a drive motor signal line according to claim 1, wherein step (b) converts the sensor signal into a normal sensor signal through a signal conversion unit when the normal output condition is satisfied through a signal comparator. Claim 5 A method for diagnosing a fault in a driving motor signal line according to claim 4, wherein if the power reaches a normal state after the charging time of the capacitor by means of the capacitor and resistor connected to the input terminal of the signal comparator, the signal comparator satisfies the normal output condition. Claim 6 A method for diagnosing a fault in a drive motor signal line, wherein step (c) involves using a control unit to check for a phase change between an inverted sensor signal and a normal sensor signal. Claim 7 A method for diagnosing a fault in a drive motor signal line according to claim 1, wherein the inverted sensor signal outputs the A, B, and I signals of the ABI sensor by inverting them, and the normal sensor signal outputs the A, B, and I signals of the ABI sensor without inversion when the power reaches a normal state. Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 A drive motor signal line fault diagnosis device comprising: a signal comparator that satisfies an inverted output condition in an initial state where power is applied and satisfies a normal output condition when power reaches a normal state; a signal conversion unit that converts a sensor signal into an inverted sensor signal or a sensor signal into a normal sensor signal according to the output condition of the signal comparator; and a control unit that monitors the inverted sensor signal and the normal sensor signal output from the signal conversion unit and diagnoses whether the signal line is faulty by checking for a phase change between them, wherein the output duration of the inverted sensor signal is determined through a timer set in the initial state where power is applied, and the control unit checks for a phase change between the inverted sensor signal and the normal sensor signal after the output duration of the inverted sensor signal has elapsed, and if there is no phase change between the inverted sensor signal and the normal sensor signal, determines that it is faulty and warns the system accordingly, and if the output duration of the inverted sensor signal is exceeded, determines that it is faulty. Claim 12 A driving motor signal line fault diagnosis device according to claim 11, wherein the signal comparator has a capacitor and a resistor connected to the input terminal, the charging time of the capacitor is determined, and during the charging time, the inversion output condition is satisfied. Claim 13 In claim 12, the above signal comparator is a drive motor signal line fault diagnosis device that satisfies normal output conditions when the charging time of the capacitor has elapsed and the power has reached a normal state. Claim 14 A drive motor signal line fault diagnosis device according to claim 11, wherein the control unit checks for a phase change between the inverted sensor signal and the normal sensor signal, and determines that there is no phase change as a fault. Claim 15 A drive motor signal line fault diagnosis device according to claim 11, wherein the inverted sensor signal outputs the A, B, and I signals of the ABI sensor by inverting them, and the normal sensor signal outputs the A, B, and I signals of the ABI sensor without inversion when the power reaches a normal state. Claim 16 delete Claim 17 delete Claim 18 delete

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