KR102312733B1 - Oil pump motor control apparatusn and fail safe method thereof - Google Patents

Abstract

It relates to an oil pump motor control apparatus and a fail-safe method thereof, and diagnoses whether a failure of the hall sensor occurs and drives the motor based on a motor driving means for driving a three-phase BLDC motor and a detection signal of a hall sensor installed in the motor A configuration including a control unit that generates a PWM control signal to control the driving of the means is provided, and the hall sensor failure is diagnosed using the detection signal of the Hall sensor installed in the three-phase BLDC motor, and the motor is operated according to the failure diagnosis result. It controls to continuously drive normally, and it is possible to diagnose whether the motor is operating normally in the process of driving the motor by the forced excitation method.

Description

OIL PUMP MOTOR CONTROL APPARATUSN AND FAIL SAFE METHOD THEREOF

The present invention relates to an oil pump motor control device and a fail-safe method thereof, and more particularly, to an oil pump motor control device for controlling a motor driving of an oil pump applied to a hybrid automatic transmission and a fail-safe method thereof. it's about

In general, 3-phase brushless DC motors (hereinafter referred to as 'BLDC motors') have advantages such as compact size, excellent control performance, and high efficiency, and are therefore widely applied in consumer goods and industrial fields. In the automotive industry, it is in the spotlight as part of a strategy to eliminate belts and hydraulic systems, add functions, and improve fuel economy.

In recent years, due to the continuous drop in the price of electronic components for controlling BLDC motors, the output level is also continuously expanding along with the field of application.

The present applicant has applied for a technology for controlling the driving of a BLDC motor and a pump to which it is applied, disclosed in a number of Patent Documents 1 and 2, such as the following Patent Documents.

These BLDC motors generally require one or more rotor position detection sensors (Hall sensors) because electrical excitation must be synchronized with the rotor position.

Meanwhile, in the hybrid automatic transmission, an oil pump for supplying oil to each part to provide hydraulic pressure, lubrication and cooling, is provided in the automatic transmission so that the clutch and the brake can transmit torque required for vehicle operation.

As the mechanical oil pump and the electric oil pump are applied together in the conventional first-generation hybrid vehicle, even if an abnormality such as a hall sensor failure occurs in the electric oil pump, it is possible to replace the electric oil pump with a mechanical oil pump.

Republic of Korea Patent Registration No. 10-0649355 (Notice on November 27, 2006) Republic of Korea Patent Registration No. 10-1244844 (Announced March 19, 2013)

However, as the mechanical oil pump is deleted in the second-generation hybrid vehicle being developed recently, the reliability of the electric oil pump is becoming a very important item.

Therefore, when a failure of the position detection sensor of the motor driving the electric oil pump occurs, the development of a fail-safe technology that detects this and drives the motor without the position detection sensor to increase reliability is required.

An object of the present invention is to solve the above problems, an oil pump motor control device capable of detecting a failure of a position detection sensor of an oil pump motor applied to a transmission, and driving the motor even when a failure occurs, and a fail-safe thereof to provide a way

Another object of the present invention is to provide an oil pump motor control apparatus capable of continuously driving a motor by forcibly excitation based on a driving state of a vehicle when a position detection sensor fails, and a fail-safe method thereof.

Another object of the present invention is to provide an oil pump motor control apparatus capable of diagnosing whether the motor is normally driven when all Hall sensors provided as position detection sensors of the motor fail, and a fail-safe method thereof.

In order to achieve the above object, the oil pump motor control device according to the present invention is based on a motor driving means for driving a three-phase BLDC motor and a detection signal of a Hall sensor installed in the motor, whether the Hall sensor malfunctions or not. and a control unit for diagnosing and generating a PWM control signal for controlling the driving of the motor driving means, wherein the control unit forcibly excites the motor based on the driving state of the vehicle when diagnosing a failure of all Hall sensors provided in the motor It is characterized in that the control is continuously driven, and whether the motor is normally operated using the current value of the motor is diagnosed, and the driving of the motor is controlled based on the diagnosis result.

In addition, in order to achieve the above object, the fail-safe method of the oil pump motor control apparatus according to the present invention comprises the steps of (a) driving a three-phase BLDC motor by receiving driving power, (b) in the hall sensor generating a detection signal by sensing the position of the rotor provided inside the motor, (c) diagnosing whether a failure has occurred using the detection signal of the Hall sensor in the control unit, and (d) the failure of step (c) As a result of the diagnosis, when diagnosing a failure of all Hall sensors, the control unit forcibly excites and continuously drives the motor based on the driving state of the vehicle, wherein the control unit uses the current value of the motor in step (d). It is characterized in that it is diagnosed whether the motor is operating normally, and the driving of the motor is controlled based on the diagnosis result.

As described above, according to the oil pump motor control apparatus and the fail-safe method thereof according to the present invention, the failure of the Hall sensor is diagnosed using the detection signal of the Hall sensor installed in the three-phase BLDC motor, and the motor is based on the failure diagnosis result. The effect of being able to control to continuously drive normally is obtained.

That is, according to the present invention, it is possible to perform a failure diagnosis according to whether a failure of the Hall sensor occurs, whether a wire is disconnected, and a contact defect of a connector connected to the Hall sensor using the detection signal of the Hall sensor according to the present invention.

And, according to the present invention, by generating a Hall signal using the detection signals of the remaining Hall sensors when diagnosing a failure of one or more Hall sensors, the effect that the motor can be normally driven is obtained.

In addition, according to the present invention, when diagnosing a failure of all Hall sensors, a forcible excitation signal is generated based on the driving state of the vehicle and the motor is continuously driven in a forced excitation method, so that each part of the vehicle due to stopping the operation of the oil pump is reduced. The effect that failure or damage can be prevented is obtained.

In addition, according to the present invention, the normal operation of the motor is diagnosed in the process of driving the motor by the forced excitation method, and if the driving of the motor is stopped, the motor driving by the forced excitation method is stopped, and the oil pump is in a failure state. The effect of preventing damage or failure of the transmission due to the failure of the oil pump is obtained.

Accordingly, according to the present invention, it is possible to improve the driving stability of the vehicle oil pump due to the failure of the hall sensor is obtained.

1 is a block diagram of an oil pump motor control device according to a preferred embodiment of the present invention;
2 is a graph illustrating a forced excitation signal;
3 is a circuit diagram showing an electrical equivalent circuit for a DC motor;
4 is a flowchart illustrating a fail-safe method of an oil pump motor control device according to a preferred embodiment of the present invention step by step;
5 is a diagram illustrating a timing chart of an oil pump motor control device;
6 is a diagram illustrating logic values according to whether detection signals are received by first to third Hall sensors during one driving cycle of the motor;
7 is a diagram illustrating a timing chart of an oil pump motor control device when the third Hall sensor is faulty diagnosed;
8 is a flowchart illustrating step-by-step a method of controlling the driving of a motor in a failure state of all Hall sensors.

Hereinafter, an oil pump motor control apparatus and a fail-safe method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The oil pump motor control apparatus according to the present invention will be described as controlling the driving of an oil pump motor applied to a transmission of a hybrid vehicle.

However, it should be noted that the present invention is not necessarily limited thereto, and can be applied to various devices to which a three-phase BLDC motor is applied.

In this embodiment, the failure state of any one or more of the first to third Hall sensors, the disconnection state of any one or more of the three-phase wires of the BLDC motor, and the poor contact state of the connector connected to the first to third Hall sensors are defined as 'holes'. It is collectively referred to as a 'sensor failure state'.

1 is a block diagram of an oil pump motor control apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the oil pump motor control device according to a preferred embodiment of the present invention includes a motor driving means 20 for driving a three-phase BLDC motor 10, and detecting a rotor position of the motor 10. A control unit for diagnosing whether a failure of the hall sensor 11 has occurred and generating a control signal for controlling the driving of the motor driving means 20 based on the detection signal of the position detection sensor (hereinafter referred to as 'Hall sensor') 11 (30).

The control unit 30 diagnoses whether a failure has occurred for each of the three hall sensors 11 provided in the motor 10 , and controls the driving of the motor 10 based on the driving state of the vehicle according to the diagnosis result.

In particular, when it is diagnosed as a failure of the entire Hall sensor 11 , the controller 30 forcibly excites the motor 10 based on the driving state of the vehicle to continuously drive the motor 10 .

In addition, the control unit 30 determines the position of the rotor according to the detection signal of the Hall sensor 11 when each Hall sensor 11 is in a normal state, and varies the input period of the motor switching signal according to the determined rotor position. Thus, two phases of the three phases of the motor 10 are sequentially excited and driven, and the motor driving means 20 is controlled to forcibly excite three phases of the motor 10 when the fault diagnosis of the entire Hall sensor 10 is performed. A total of 6 PWM control signals can be generated.

In addition, the control unit 30 continuously drives the motor 10 in a forced excitation method when all Hall sensors 11 are in a failure state, and whether the motor 10 operates normally by using the armature current of the motor 10 . diagnose

Therefore, the control unit 30 transmits the diagnosis result of the driving state of the motor 10 to the main control unit to the vehicle, and if the driving of the motor 10 is stopped, notifies that the oil pump driving is impossible, It is possible to control to stop the driving of the motor 10 using the forced excitation method.

In this embodiment, the motor 10 may be provided as a motor for driving an external oil pump provided in the second-generation hybrid vehicle.

Therefore, the oil pump is provided as an electronic oil pump, and only the electronic oil pump is applied to the second-generation hybrid vehicle, unlike the existing first-generation hybrid vehicle in which both a mechanical and an electronic oil pump are provided.

First to third Hall sensors H1 to H3 for detecting the position of a rotor provided in the motor 10 are installed in the motor 10 .

The first to third Hall sensors H1 to H3 are electrically disposed at an angle of 120°, respectively, and detect a change in a magnetic field according to a position of a rotor to output a detection signal.

The motor driving means 20 includes a gate driver 21 for outputting the motor switching signal according to a control signal of the control unit 30 and a motor driving unit for driving the motor 10 by switching driving power according to the motor switching signal ( 22) may be included.

That is, in this embodiment, two-phase excitation for driving the motor 10 in a normal state of the Hall sensor 11 and a three-phase excitation for driving the motor 10 at the time of diagnosing a failure of the entire Hall sensor 11 are simultaneously applied. To do this, the motor 10 can be driven by removing the conventional motor controller, and generating a total of six control signals according to whether the hall sensor 11 is faulty diagnosed by the controller 30 .

The gate driver 21 is a switching circuit provided to output or intermittently the control signal.

The motor driving unit 22 is configured as a 3-phase full bridge circuit, and has a metal-oxide-semiconductor field effect transistor (Metal-Oxid-Semiconductor Field Effect) on a high side and a low side. transistor) or a switching device provided as an insulated gate bipolar transistor.

The control unit 30 may receive the current RPM of the vehicle engine and the target RPM of the motor 10 from a main control unit (not shown) provided in the vehicle, and output it as a PWM control signal for controlling the driving of the motor 10 .

Then, the control unit 30 receives the detection signals from the first to third Hall sensors H1 to H3, diagnoses whether a failure has occurred, and outputs a PWM control signal for controlling the driving of the motor 10 based on the diagnosis result. can do.

To this end, the control unit 30 is a failure diagnosis unit for diagnosing whether a failure has occurred in the first to third Hall sensors H1 to H3 using the detection signals transmitted from the first to third Hall sensors H1 to H3. (31) and when any one or more of the first to third Hall sensors H1 to H3 fails, a Hall signal is generated using the detection signals of the remaining Hall sensors, and a forced excitation signal when diagnosing a failure of all Hall sensors 11 may include a signal generator 32 for generating

For example, the fault diagnosis unit 31 counts up the first timer 33 provided inside the control unit 30 to measure 60° time, and sets the value of the first timer 33 to the second It is possible to diagnose whether a failure occurs in the first to third Hall sensors H1 to H3 by copying to the timer 34 and counting down the second timer 34 to measure the time of 60°.

Here, when the fault diagnosis unit 31 detects any one or more detection signals from among the first to third Hall sensors H1 to H3 a preset number of times, for example, three times, the number of times of error occurrence during a preset driving cycle It is possible to confirm the fault diagnosis of the corresponding Hall sensor.

Alternatively, the failure diagnosis unit 31 may determine the failure diagnosis of the corresponding Hall sensor when an error is continuously detected for a preset time period, for example, about 150 msec.

When the fault diagnosis unit 31 diagnoses that the hall sensors 11 are in a normal state, the signal generator 32 controls the PWM control to control the driving of the motor 10 using the detection signals of the hall sensors 11 . signal can be generated.

On the other hand, the signal generator 32 uses the detection signals of the remaining Hall sensors 11 when the failure diagnosis of one or more of the first to third Hall sensors H1 to H3 is confirmed by the failure diagnosis unit 31 . A PWM control signal may be generated to control the driving of the motor 10 .

On the other hand, when the first to third Hall sensors H1 to H3 are diagnosed as a failure, the control unit 30 generates a control signal to forcibly excite the motor 10 based on the driving state of the vehicle.

For example, the driving state of the vehicle may include the target RPM or load state of the oil pump transmitted from the main control unit of the vehicle.

Accordingly, the controller 30 may control the RPM of the motor 10 to vary by adjusting the current or voltage level supplied to the stator coil of the motor 10 according to the target RPM or the load state.

To this end, the controller 30 may map and store the current or voltage level of the control signal for each target RPM or load in the memory, and generate a control signal of the current or voltage level corresponding to the target RPM or load.

For example, FIG. 2 is a graph illustrating a forced excitation signal.

As shown in FIG. 2 , when the motor 10 is driven by forcibly excitation, the control unit 30 may output a forced excitation signal having a voltage level in the form of a three-phase sine wave (SINE).

Here, the torque and rotation speed of the motor 10 are determined according to the level and frequency of the forced excitation signal.

In general, a system that receives RPM feedback is configured as a closed-loop system that increases voltage output when RPM is insufficient.

However, since the RPM feedback cannot be received when the entire Hall sensor 11 is in a fault state, the present embodiment may be configured to forcibly excite the motor 10 using an open-loop system configuration.

And when a low voltage is output in a situation where the load of the oil pump connected to the motor 10 is not known, the motor 10 cannot rotate.

Due to this problem, in most general systems, the motor 10 is driven by outputting the maximum voltage.

Therefore, in this embodiment, when the target RPM is received from the main control unit of the vehicle, the control unit 10 calculates the frequency of the control signal for forcibly exciting the motor 10 using Equation 1 below, and calculates the calculated frequency. It controls to output a control signal in the form of a sine wave.

[Equation 1]

RPM = 60*(2/N)*f, f = RPM/(60*(2/N))

where N is the number of poles of the motor.

Table 1 is a voltage table of the forced excitation signal by target RPM and oil temperature when all Hall sensors fail.

target RPM oil temperature -40℃ -30℃ -20℃ -10℃ -0℃ 10℃ 20℃ 30℃ 40℃ 1000rpm 100V 90V 80V 70V 60V 50V 40V 30V 20V 2000rpm 110V 98V 86V 75V 65V 54V 44V 33V 22V 3000rpm 120V 106V 92V 80V 70V 58V 48V 36V 24V 4000rpm 140V 114V 98V 85V 75V 62V 52V 39V 26V 5000rpm 160V 122V 104V 90V 80V 66V 56V 42V 28V

As the voltage applied to the motor 10 increases, the torque of the motor 10 increases. However, when the RPM of the motor 10 increases, the torque decreases even at the same voltage. And the torque of the oil pump is determined by the viscosity of the oil, and the viscosity of the oil is related to the temperature of the oil.

Therefore, the controller 30 maps the target RPM of the motor 10 and the voltage of the forced excitation signal for each temperature of the oil as shown in Table 1 using the relationship between the torque of the oil pump and the viscosity and temperature of the oil. The table is stored in the memory, and the driving of the motor 10 is controlled by outputting a forced excitation signal according to the stored table.

Here, the table is configured by performing a mapping operation for optimizing the torque characteristics of the oil pump connected to the motor 10, and the present invention outputs the optimized forced excitation signal through the table configured by the mapping operation. , it is possible to obtain efficiency performance similar to that in the case of driving a motor according to the detection signal of the Hall sensor. Of course, the present invention is not necessarily limited thereto, and may be changed to forcibly excite the motor 10 in various ways other than the method using the above table.

As described above, the present invention transmits the detection signal of the Hall sensor to the control unit to diagnose the failure of the Hall sensor. By calculating , it is possible to precisely control the driving of the motor.

And, according to the present invention, when any one or more Hall sensors among the three Hall sensors fail, the control unit can control the motor to continuously drive normally by using the detection signals of the remaining Hall sensors.

To this end, the present invention can drive the motor normally by increasing the degree of freedom of motor control by outputting six PWM control signals for directly driving the motor from the controller.

In addition, in the case of a failure state of all Hall sensors, the present invention continuously drives the motor by forcibly exciting the motor using a forced excitation signal based on the driving state of the vehicle, thereby causing failure of each device provided in the vehicle due to the interruption of the driving of the motor. and damage can be prevented.

Meanwhile, Equation 1 below is a motor voltage equation, and FIG. 3 is a circuit diagram showing an electrical equivalent circuit for a DC motor.

[Equation 1]

Here, V is the applied voltage, L is the inductance of the coil, R is the winding resistance, I _a is the steady state armature current, and i is the armature instantaneous current.

In Figure 3, the counter-electromotive force e of the motor is as shown in Equation 2 below, consists of a product of the counter electromotive force constant (k _e) and flux (Φ) and the angular velocity (ω _r).

[Equation 2]

Therefore, when there is no angular velocity component in a situation where the same voltage is supplied, the counter electromotive force e of the motor becomes 0, and the current increases because it has the same winding resistance.

Accordingly, in the present embodiment, by applying Equation 2, when the motor is driven in the motor forced excitation method, the angular velocity component disappears and the current rises when the motor is stopped to diagnose whether the motor is operating normally.

That is, in an environment in which the oil pump is driven, factors affecting the current of the motor include a voltage applied to the motor, a rotation speed, and an oil temperature.

Here, the oil has a property of changing the viscosity according to the temperature, and the change in the viscosity of the oil acts as a torque component of the oil pump.

As described above, through an experiment of varying three factors affecting the motor current, the minimum current and the maximum current for each region can be configured as a three-dimensional map.

Tables 2 to 4 are the minimum and maximum current reference tables at oil temperatures of 0 °C, 30 °C, and 120 °C, respectively.

As described above, according to the present invention, it is possible to diagnose whether the motor is operating normally by using the minimum and maximum current standards composed of a three-dimensional map based on experimental values when the motor is driven by the motor forced excitation method.

Next, a fail-safe method of an oil pump motor control apparatus according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 4 .

4 is a flowchart illustrating a fail-safe method of an oil pump motor control device according to a preferred embodiment of the present invention step by step.

In step S10 of FIG. 4 , the oil pump motor control device according to the preferred embodiment of the present invention is started while the ignition key (not shown) of the vehicle is turned on and the driving power is supplied from the power supply unit (not shown) ( S10).

The control unit 30 generates a PWM control signal to drive the three-phase BLDC motor 10 for the vehicle's oil pump and transmits it to the motor driving means 20 (S12), and the motor driving means 20 responds to the PWM control signal. Accordingly, the driving power applied to the motor 10 is switched to drive the motor 10 (S14).

At this time, the first to third Hall sensors H1 to H3 installed in the motor 10 detect a change in the magnetic field according to the position of the rotor and output a detection signal (S16).

In step S18 , the control unit 30 receives the detection signals of the first to third Hall sensors H1 to H3 , and diagnoses whether a failure occurs in the first to third Hall sensors H1 to H3 .

5 is a diagram illustrating a timing chart of an oil pump motor control device, and FIG. 6 is a diagram illustrating a logic value according to whether detection signals are received by the first to third Hall sensors during one driving cycle of the motor.

4 shows the detection signals of the first to third Hall sensors H1 to H3, the RPM of the motor 10, and time counting graphs of the first and second timers 33 and 34 are shown.

As shown in FIG. 4 , the failure diagnosis unit 31 counts up the first timer 33 provided inside the control unit 30 to measure 60° time, and then the first timer 33 . By copying the value of to the second timer 34 and counting up the first timer 33 and at the same time counting down the second timer 34, repeating the process of measuring 60° time to the third Hall sensors H1 to H3 may be diagnosed.

In detail, as the first to third Hall sensors H1 to H3 are electrically installed at an angle of 120°, respectively, the detection signal of the first Hall sensor H1 and the detection signal of the second Hall sensor H2 are overlapped in the 600° interval between 120° and 180° and between 480° and 540°.

Similarly, the detection signals of the first and third Hall sensors H1 and H3 and the detection signals of the second and third Hall sensors H2 and H3 are respectively between 0° and 60° and between 240° and 300°, respectively. are each overlapped in

Therefore, the failure diagnosis unit 31 is 60° intervals for each driving cycle of the motor 10 as shown in FIG. 5 according to whether the detection signals of the first to third Hall sensors H1 to H3 are received. can be recognized as logical values of '101', '100', '110', '010', '011', and '001'.

Accordingly, the failure diagnosis unit 31 detects the number of errors occurring three times during one driving cycle of the motor 10 in the detection signals of the first to third Hall sensors H1 to H3, or continuously for about 150 msec. When an error is detected, it is possible to confirm the diagnosis of a failure of the corresponding Hall sensor.

As a result of the diagnosis of step S18, if all Hall sensors 11 are in a normal state, the signal generator 32 determines the position of the rotor using the detection signals of all Hall sensors 11 to change the input period of the motor switching signal and sequentially output a PWM control signal to excite two phases among three phases of the motor (S20).

Then, the gate driver 21 and the motor driver 22 normally drive the motor 10 by switching the driving power according to the PWM control signal and the motor switching signal.

On the other hand, when the diagnosis of any one of the first to third Hall sensors H1 to H3 is confirmed as a result of the diagnosis in step S18 ( S22 ), the signal generator 32 performs the remaining normal diagnosis as shown in FIG. 6 . A PWM control signal is output to drive the motor 10 using the detection signals of the two Hall sensors 11 (S24).

Accordingly, the gate driver 21 and the motor driver 22 normally drive the motor 10 by switching the driving power according to the PWM control signal and the motor switching signal.

7 is a diagram illustrating a timing chart of an oil pump motor control device when a third Hall sensor is faulty diagnosed.

7 is a graph showing a result of generating Hall signals of all Hall sensors using the detection signals of the first and second Hall sensors when the third Hall sensor is faulty diagnosed.

And when the two Hall sensors 11 are diagnosed as malfunctioning as a result of the diagnosis in step S18 (S26), the controller 30 controls the motor 10 to be driven using the detection signal detected by the remaining one Hall sensor (S28). .

So, after performing steps S20, S24 and S28, the control unit 30 checks whether a motor driving stop command is input in step S30, and repeats steps S16 to S30 until the motor driving stop command is input. control to do

If, as a result of the inspection in step S30, a motor driving stop command is input, the control unit 30 generates a motor control signal to stop driving of the motor 10, stops the driving of the oil pump motor control device, and then ends .

On the other hand, if all Hall sensors 11 are diagnosed as malfunctioning as a result of the diagnosis in step S18, the controller 30 proceeds to step S40 of FIG. 8 to be described below and forcibly excites the motor 10 based on the driving state of the vehicle. Control to continuously drive the motor (10).

8 is a flowchart illustrating a method of forcibly excitation driving a motor in a failure state of all Hall sensors and diagnosing whether the motor operates normally.

In step S40 of FIG. 8 , when the entire hall sensor 11 is in a fault state, the control unit 30, as shown in Table 1 above, receives a forced excitation signal according to the target RPM and the oil temperature received from the main control unit of the vehicle. By changing the voltage level of the motor 10 and outputting a forced excitation signal to the three phases of the motor 10, the motor 10 is controlled to be driven in a forced excitation method.

In this way, in the process of driving the motor 10 in the forced excitation method, the control unit 30 controls the current value flowing through the armature of the motor 10 (hereinafter abbreviated as 'motor current') and the oil shown in Tables 2 to 4 The normal operation of the motor 10 is diagnosed by comparing the temperature, the rotational speed (RPM) of the motor, and the minimum and maximum current reference tables for each applied voltage.

That is, in step S42, the controller 30 checks whether the motor current is greater than a minimum current reference.

If, as a result of the inspection in step S42, the motor current is greater than the minimum current reference, in step S44, the controller 30 checks whether the motor current is less than the maximum current reference.

Therefore, if the result of the inspection in step S44 is that the motor current is less than the maximum current reference, the controller 30 determines that the motor 10 is in a normal driving state, and reduces the motor non-driving state time (S46).

In this case, the controller 30 may subtract the previously counted motor non-driving state time by a unit time for monitoring the motor current, for example, about 10 ms.

On the other hand, if the inspection result of step S42 indicates that the motor current is less than or equal to the minimum current standard, or if the inspection result of step S44 indicates that the corner current is greater than or equal to the maximum current criterion, the controller 30 determines that the motor 10 is in a fault state in which the driving is stopped.

In this case, the controller 30 may increase the motor non-driving state time by the unit time, that is, about 10 ms (S48).

In step S50, the control unit 30 checks whether the counted motor non-driving state time is greater than a preset time.

The set time may be set by an experimental value in order to determine a state in which it is difficult to normally drive the transmission due to the non-operation of the oil pump.

For example, the set time may be set to about 4 s when the unit time for monitoring the motor current is 10 ms.

Therefore, as a result of the inspection in step S50, if the motor non-driving state time is less than or equal to the set time, the control unit 30 maintains to drive the motor in the forced excitation method (S52), and proceeds to step S30 in FIG.

On the other hand, as a result of the SS50 inspection, if the motor non-driving state time exceeds the set time, the control unit 30 stops driving the motor 10 by the forced excitation method, and returns the oil pump failure state to the main control unit of the vehicle. notify

So, in order to protect the transmission and the oil pump, the main control unit releases the connection between the engine and the transmission to change to a neutral state.

Accordingly, the driver prevents damage or failure of the transmission due to the failure of the oil pump, and enables avoidance driving.

Through the process as described above, the present invention performs fault diagnosis of the Hall sensor using the detection signal of the Hall sensor installed in the motor, and normally drives the motor using the detection signal of the remaining Hall sensors when the Hall sensor is faulty. It can be controlled to continuously drive the motor in a forced excitation method when diagnosing a failure of all Hall sensors.

In addition, the present invention diagnoses whether the motor is operating normally in the process of driving the motor by the forced excitation method, stops driving the motor by the forced excitation method if the driving of the motor is stopped, and notifies the failure state of the oil pump. It is possible to prevent damage or failure of the transmission due to the failure of the oil pump.

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

The present invention performs fault diagnosis of the Hall sensor using the detection signal of the Hall sensor installed in the motor, normally drives the motor using the detection signal of the remaining Hall sensors when the Hall sensor is faulty, and diagnoses the failure of all Hall sensors. It is applied to the oil pump motor control device technology that continuously drives the motor by force excitation method and controls the operation of the motor according to the result of diagnosing whether the motor is operating normally.

10: Motor 11: Hall sensor
20: motor driving means 21: gate driver
22: motor drive unit
30: control unit 31: fault diagnosis unit
32: signal generator 33,34: first, second timer
H1 to H3: first to third hall sensors

Claims (6)

A motor driving means for driving a three-phase BLDC motor and
A control unit for diagnosing whether a failure of the Hall sensor has occurred based on a detection signal of the Hall sensor installed in the motor and generating a PWM control signal for controlling the driving of the motor driving means,
The control unit determines the position of the rotor using the detection signal of each Hall sensor when all Hall sensors are in a normal state, changes the input period of the motor switching signal, and transmits it to the motor driving unit of the motor driving means,
Outputs the motor switching signal to the motor driving unit to drive the motor using the remaining Hall sensors when any one or more of the hall sensors are diagnosed,
When diagnosing a failure of all Hall sensors provided in the motor, a forced excitation signal is output to each phase of the motor based on the target RPM of the oil pump received from the main control unit of the vehicle or the driving state of the vehicle including the load state, and the motor control to continuously drive the motor by forcibly exciting the motor by transmitting it to the driving unit, diagnosing whether the motor is operating normally using the current value of the motor, and controlling the driving of the motor based on the diagnosis result,
When the motor is driven by the forced excitation method, the current value flowing through the armature of the motor is compared with the preset minimum and maximum current reference tables. Stop and control the oil pump motor control device to notify the main control unit of the vehicle of the failure state of the oil pump. delete According to claim 1,
The table is an oil pump motor control device, characterized in that it is composed of a three-dimensional map of the minimum and maximum currents set by the experimental values for each oil temperature, the rotation speed of the motor, and the applied voltage that affect the current value. 4. The method of claim 1 or 3,
The Hall sensor is provided with first to third Hall sensors electrically installed at an angle of 120°,
The control unit includes a failure diagnosis unit for diagnosing whether a failure has occurred in the first to third Hall sensors using the detection signals transmitted from the first to third Hall sensors;
When any one of the first to third Hall sensors fails, the PWM control signal is generated using the detection signals of the remaining Hall sensors, and a signal generator for generating the forced excitation signal when all Hall sensors are faulty. Oil pump motor control device, characterized in that. (a) receiving driving power to drive the 3-phase BLDC motor;
(b) generating a detection signal by sensing the position of the rotor provided inside the motor in the Hall sensor;
(c) diagnosing whether a failure has occurred by using the detection signal of the Hall sensor in the control unit; and
(d) as a result of the fault diagnosis in step (c), the motor is forcibly excited based on the driving condition of the vehicle including the target RPM or load condition of the oil pump transmitted from the main control unit of the vehicle when the fault diagnosis of all Hall sensors Including the step of controlling to continuously drive by
In step (d), the voltage of the forced excitation signal for each target RPM or load based on the target RPM or load state of the oil pump transmitted from the main control unit of the vehicle when the control unit diagnoses a failure of all hall sensors by the control unit (d1) Storing the level-mapped table in a memory, and generating a forced excitation signal having a voltage level in the form of a three-phase sinusoid corresponding to the target RPM or load;
(d2) If the current value flowing in the armature of the motor driven by the forced excitation method is compared with the preset minimum and maximum current reference tables to diagnose whether the motor is operating normally, and as a result of the diagnosis, the current value is out of the normal range , stopping the motor driving by the forced excitation method, and notifying a failure state of the oil pump to a main control unit of the vehicle. delete

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