KR20230156010A - Apparatus and nethod for protecting overcurrent of clutch control system - Google Patents

Abstract

An overcurrent protection device and method for a clutch control system are disclosed. The overcurrent protection device of the clutch control system of the present invention controls a plurality of switching elements in the inverter according to the duty of the PWM (Pulse Width Modulation) signal to control the current applied to the motor and detects the motor current output from the inverter. control unit; And if the motor current is overcurrent, a controller that adjusts the duty of the PWM signal to the current ratio and inputs it to the motor control unit, and adjusts the current applied to the motor through the motor control unit according to the duty of the adjusted PWM signal. It is characterized by

Description

Overcurrent protection device and method for clutch control system {APPARATUS AND NETHOD FOR PROTECTING OVERCURRENT OF CLUTCH CONTROL SYSTEM}

The present invention relates to an overcurrent protection device and method for a clutch control system, and more specifically, to a device for adjusting the duty of a PWM (Pulse Width Modulation) signal for motor control through the current ratio of the motor when the motor current continues in an overcurrent state. It relates to an overcurrent protection device and method for a clutch control system.

The Intelligent Manual Transmission (IMT) (eClutch) system is an eco-friendly control system that converts the powertrain clutch from existing hydraulic control to electric motor control.

In the IMT (eClutch) system, the current usage at the controller level is equal to the torque usage at the system level, and in order to quickly reach the target position during the clutch opening process, the designed controller must be able to use the maximum torque. This affects the driver's riding comfort and shifting feel during starting and shifting. Therefore, the IMT (eClutch) system performs clutch open/close control by maximizing the performance of the motor mounted on the designed controller.

In the conventional powertrain motor control model, there was no concept of controller protection and overcurrent diagnosis that considered safety compared to maximum performance. The current used for the above high-performance control greatly affects the motor and controller differently depending on the level. For example, when maintaining 60A 400ms, the controller is normal, but the motor may be damaged, and at 30A 3s, the motor is normal, but the controller may be damaged.

In addition, due to the nature of the system, the control of the motor must be continuously maintained (reference check (wall detection, zero point adjustment) in the closed area, position control within the maximum open range of the clutch in the open area), and overheating of the controller following overcurrent depends on the vehicle dynamic characteristics. There is a high possibility of exposure to The range of current used in the system is 0A ~ 50A at room temperature and 0A ~ 65A at extreme zero (-40 degrees), so the current value is high and the range of current use is wide. Depending on the temperature, the resistance Rds(on) on the drain-source of the MOSFET may change, or the resistance corresponding to the entire system load may also change, exposing the system to an unexpected amount of current, which may cause overheating of the controller and motor. may cause the condition.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-1339205 (registered on December 3, 2013) titled ‘Overcurrent diagnosis method and system for oil pump control unit of hybrid vehicle’.

The present invention was created to improve the above-mentioned problem, and the purpose of one aspect of the present invention is to change the duty of the PWM (Pulse Width Modulation) signal for motor control to the current ratio of the motor when the motor current continues in an overcurrent state. The purpose is to provide an overcurrent protection device and method for a clutch control system that adjusts the current of the motor according to the duty of the adjusted PWM signal.

The overcurrent protection device of the clutch control system according to one aspect of the present invention controls a plurality of switching elements in the inverter according to the duty of the PWM (Pulse Width Modulation) signal to control the current applied to the motor and the motor current output from the inverter. A motor control unit that detects; And if the motor current is overcurrent, a controller that adjusts the duty of the PWM signal to the current ratio and inputs it to the motor control unit, and adjusts the current applied to the motor through the motor control unit according to the duty of the adjusted PWM signal. It is characterized by

The current ratio of the present invention is characterized in that the target current to be applied to the motor is divided by the motor current.

The controller of the present invention determines whether the motor current is overcurrent by comparing the motor current with a preset threshold, and the threshold is set for each preset temperature section.

The threshold value of the present invention is characterized in that it is set according to the damage index area set for the controller and the motor for each temperature section.

The threshold value of the present invention is characterized in that it is set according to the normal operation time for each current at which the controller and the motor can normally operate.

The controller of the present invention is characterized by controlling the current applied to the motor through the motor control unit for a preset control time when the motor current is overcurrent.

The controller of the present invention adjusts the current applied to the motor through the motor control unit when the duration of the overcurrent state is longer than a preset time limit, and the time limit is such that the controller and the motor operate normally in the overcurrent state. Thus, it is characterized by a time during which the motor can operate at a preset performance even in an overcurrent state.

An overcurrent protection method of a clutch control system according to an aspect of the present invention includes the steps of a controller determining whether a motor current output from an inverter is an overcurrent; And if the motor current is overcurrent as a result of the determination, the controller adjusts the duty of the PWM (Pulse Width Modulation) signal to the current ratio and inputs it to the motor control unit, and controls the motor to the motor through the motor control unit according to the duty of the adjusted PWM signal. It is characterized by comprising the step of adjusting the applied current.

1 is a block diagram of an overcurrent protection device of a clutch control system according to an embodiment of the present invention.
FIG. 2 is a block diagram of the controller of FIG. 1.
Figure 3 is a diagram for explaining the operation of the overcurrent protection device of the clutch control system according to an embodiment of the present invention.
Figure 4 is a flowchart of an overcurrent protection method of a clutch control system according to an embodiment of the present invention.

Hereinafter, an overcurrent protection device and method for a clutch control system according to an embodiment of the present invention will be described in detail with reference to the attached drawings. In this process, the thickness of lines or sizes of components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

FIG. 1 is a block diagram of an overcurrent protection device of a clutch control system according to an embodiment of the present invention, FIG. 2 is a block diagram of the controller of FIG. 1, and FIG. 3 is a clutch control diagram according to an embodiment of the present invention. This is a diagram to explain the operation of the system’s overcurrent protection device.

Referring to FIG. 1, the overcurrent protection device of the clutch control system according to an embodiment of the present invention includes an inverter 100, a motor 200, a motor control unit 300, and a controller 400.

The motor 200 generates rotational force by receiving three-phase alternating current power provided from the inverter 100, and the type or structure of the motor 200 is not particularly limited.

The motor 200 may control the power train clutch. The current usage of the motor 200 in the Intelligent Manual Transmission (IMT) (eClutch) system is equal to the torque usage at the system level, and in order to quickly reach the target position in the process of opening the clutch, the maximum torque must be available. That is, the motor 200 operates at maximum performance under the control of the controller 400 and performs clutch open or close control.

The inverter 100 converts direct current power stored in a power supply device (eg, battery) (not shown) into alternating current power for driving a motor.

The inverter 100 may include a plurality of switching elements whose on/off states are controlled by a pulse width modulation (PWM) signal provided from the controller 400. These plural switching elements are PWM controlled to generate alternating current power.

The PWM signal has the form of a pulse that repeats high/low states with a predetermined period, and the amount of power provided to the motor 200 can be adjusted by controlling the duty cycle or duty ratio, which is the ratio of the high section of the PWM signal.

The switching element constituting the inverter 100 may be comprised of one of an Insulated Gate Bipolar Transistor (IGBT), a MOSFET, a transistor, and a relay.

The motor control unit 300 outputs a three-phase motor driving signal according to the duty of the PWM signal output from the controller 400. Each switching element is switched according to these three-phase motor driving signals.

Additionally, the motor control unit 300 detects the motor current output from the motor 200 and inputs it to the controller 400.

The controller 400 transmits the duty of the PWM signal for powertrain clutch operation of the HKMC IMT (eClutch) system to the motor control unit 300. At this time, the motor control unit 300 PWM controls each switching element of the inverter 100 according to the duty of the PWM signal received from the controller 400, so that a target current corresponding to the target voltage is applied to the motor 200.

In this process, the controller 400 receives the motor current from the motor control unit 300, adjusts the duty of the PWM signal based on the motor current, and controls the target current of the inverter 100 through the motor control unit 300.

Referring to Figures 2 and 3, the controller 400 includes an overcurrent diagnosis unit 410 and an overcurrent protection unit 420.

The overcurrent diagnostic unit 410 determines whether the motor current received from the motor control unit 300 is overcurrent. The overcurrent diagnosis unit 410 compares the motor current with a preset threshold value and determines the motor current as overcurrent if the motor current is greater than the threshold value.

The threshold is a reference value for determining whether the motor current is overcurrent. The threshold can be set in various ways depending on the preset temperature range.

Typically, the range of current used in the system is 0A to 50A at room temperature and 0A to 65A at extreme freezing (-40 degrees), so the current value is high and the range of current use is wide. Depending on the temperature section, the resistance Rds(on) on the drain-source of the MOSFET may vary, or the resistance corresponding to the entire system load may vary, possibly exposing an unexpected amount of current to the system, which may be caused by the controller 400 And/or it may cause overheating of the motor 200.

Overheating of each of the controller 400 and the motor 200 may occur simultaneously, but may occur only in one of them. For example, even if the controller 400 is in an overheated state, the motor 200 may be in a normal state, and even if the controller 400 is in a normal state, the motor 200 may be in an overheated state. That is, damage due to overheating of the controller 400 and the motor 200 may appear differently. Moreover, the damage index area, that is, the normal operation time for each current, of each of the controller 400 and the motor 200 is different for each temperature section.

Here, the normal operation time for each current is the time for normal operation for each current in a damaged state, and is displayed for each controller and motor. The normal operating time for each current of the controller 400 and the normal operating time for each current of the motor 200 may be the same or different from each other.

Accordingly, the threshold value is set according to the damage index area of each controller and motor for each temperature section.

When the motor current is diagnosed as overcurrent by the overcurrent diagnosis unit 410, the overcurrent protection unit 420 measures the overcurrent duration, and if the duration is longer than the limit time, adjusts the duty of the PWM signal based on the current ratio to make this adjustment. The inverter 100 is controlled during the control time using the duty of the PWM signal.

To be more specific, first, when the motor current is diagnosed as overcurrent by the overcurrent diagnosis unit 410, the overcurrent protection unit 420 determines whether the duration of the overcurrent state exceeds a preset time limit.

The time limit is the time during which both the controller 400 and the motor 200 operate normally in an overcurrent state so that the motor can operate at preset performance, that is, maximum performance, even in an overcurrent state. The time limit is set within the maximum time range that allows the motor to operate at maximum performance even in overcurrent conditions.

The overcurrent protection unit 420 adjusts the duty of the PWM signal when the duration exceeds the time limit.

That is, the controller 400 adjusts the PWM duty by multiplying the current PWM duty by the current ratio of the motor. The current ratio of the motor is the target current to be applied to the motor divided by the motor current. Here, the target current is the current set so that the motor can operate at maximum performance.

The equation for calculating the target duty is as follows.

V1=V0×(I1/I0)+Gp×proportional deviation+Gi×accumulated deviation

Here, V1 is the duty of the adjusted PWM signal, I1 is the target current, I0 is the motor current (current feedback current), Gp and Gi are the gain values, the proportional deviation is the error between the target current and the motor current, and the cumulative Deviation is the accumulated error between target current and motor current.

The control time is the time for controlling the inverter 100 by applying the duty of the adjusted PWM signal to the motor control unit 300. The control time may be set at a preset ratio to the duration, for example, twice the overcurrent duration.

Hereinafter, an overcurrent protection method of a clutch control system according to an embodiment of the present invention will be described in detail with reference to FIG. 4.

Figure 4 is a flowchart of an overcurrent protection method of a clutch control system according to an embodiment of the present invention.

First, in the process of performing a powertrain clutch operation, the overcurrent diagnosis unit 410 determines whether the motor current received from the motor control unit 300 is overcurrent.

That is, the overcurrent diagnosis unit 410 compares the motor current received from the motor control unit 300 with a preset threshold value and determines whether the motor current is greater than or equal to the threshold value (S10, S20).

If the motor current is overcurrent as a result of the determination in step S20, the overcurrent protection unit 420 measures the overcurrent duration (S30).

The overcurrent protection unit 420 compares the overcurrent duration with the limit time to determine whether the overcurrent duration is longer than the limit time (S40), and if the overcurrent duration is longer than the limit time, adjusts the duty of the PWM signal based on the current ratio. (S50).

Next, the overcurrent protection unit 420 inputs the duty of the PWM signal adjusted as described above to the motor control unit 300, and the motor control unit 300 operates the inverter 100 according to the duty input from the overcurrent protection unit 420. ) to adjust the current applied to the motor 200 for a preset control time.

In this way, the overcurrent protection device and method of the clutch control system according to an embodiment of the present invention adjusts the duty of the PWM (Pulse Width Modulation) signal for motor control through the current ratio of the motor when the motor current continues in an overcurrent state. , By adjusting the motor current according to the duty of the adjusted PWM signal, the safety and maximum performance of the clutch control system can be guaranteed.

In addition, the overcurrent protection device and method of the clutch control system according to an embodiment of the present invention manages the damage index area of the motor and controller by temperature to ensure maximum performance for each temperature section.

Implementations described herein may be implemented, for example, as a method or process, device, software program, data stream, or signal. Although discussed only in the context of a single form of implementation (eg, only as a method), implementations of the features discussed may also be implemented in other forms (eg, devices or programs). The device may be implemented with appropriate hardware, software, firmware, etc. The method may be implemented in a device such as a processor, which generally refers to a processing device that includes a computer, microprocessor, integrated circuit, or programmable logic device. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants (“PDAs”) and other devices that facilitate communication of information between end-users.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will recognize that various modifications and other equivalent embodiments can be made therefrom. You will understand. Therefore, the true technical protection scope of the present invention should be determined by the scope of the patent claims below.

100: Inverter 200: Motor
300: motor control unit 400: controller
410: Overcurrent diagnosis unit 420: Overcurrent protection unit

Claims (7)

A motor control unit that controls a plurality of switching elements in the inverter according to the duty of a PWM (Pulse Width Modulation) signal to control the current applied to the motor and detects the motor current output from the inverter; and
If the motor current is overcurrent, a controller adjusts the duty of the PWM signal to the current ratio and inputs it to the motor control unit, and adjusts the current applied to the motor through the motor control unit according to the duty of the adjusted PWM signal,
The current ratio is the target current to be applied to the motor divided by the motor current,
The controller determines whether the motor current is overcurrent by comparing the motor current with a preset threshold, and the threshold is set for each preset temperature section,
The overcurrent protection device of the clutch control system, characterized in that the threshold value is set according to the damage index area set for the controller and the motor for each temperature section. A motor control unit that controls a plurality of switching elements in the inverter according to the duty of a PWM (Pulse Width Modulation) signal to control the current applied to the motor and detects the motor current output from the inverter; and
If the motor current is overcurrent, a controller adjusts the duty of the PWM signal to the current ratio and inputs it to the motor control unit, and adjusts the current applied to the motor through the motor control unit according to the duty of the adjusted PWM signal,
The current ratio is the target current to be applied to the motor divided by the motor current,
The controller takes into account the current PWM duty multiplied by the current ratio of the motor, a proportional deviation indicating the error between the target current and the motor current, and a cumulative deviation indicating the accumulated value of the error between the target current and the motor current. Overcurrent protection device of the clutch control system, characterized by adjusting the PWM duty. The method of claim 1, wherein the threshold is
An overcurrent protection device for a clutch control system, characterized in that it is set according to a normal operation time for each current at which the controller and the motor can normally operate. The method of claim 1 or 2, wherein the controller
An overcurrent protection device for a clutch control system, characterized in that when the motor current is overcurrent, the current applied to the motor is adjusted through the motor control unit for a preset control time. The method of claim 4, wherein the controller
If the duration of the overcurrent state is longer than a preset time limit, the current applied to the motor is adjusted through the motor control unit,
The time limit is a time during which the controller and the motor operate normally in an overcurrent state and the motor can operate at a preset performance even in an overcurrent state. A step where the controller determines whether the motor current output from the inverter is overcurrent; and
As a result of the determination, if the motor current is overcurrent, the controller adjusts the duty of the PWM (Pulse Width Modulation) signal to the current ratio, inputs it to the motor control unit, and applies it to the motor through the motor control unit according to the adjusted duty of the PWM signal. Including the step of adjusting the current,
The current ratio is the target current to be applied to the motor divided by the motor current,
The controller takes into account the current PWM duty multiplied by the current ratio of the motor, a proportional deviation indicating the error between the target current and the motor current, and a cumulative deviation indicating the accumulated value of the error between the target current and the motor current. Overcurrent protection method for a clutch control system characterized by adjusting PWM duty. A step where the controller determines whether the motor current output from the inverter is overcurrent; and
As a result of the determination, if the motor current is overcurrent, the controller adjusts the duty of the PWM (Pulse Width Modulation) signal to the current ratio, inputs it to the motor control unit, and applies it to the motor through the motor control unit according to the adjusted duty of the PWM signal. Including the step of adjusting the current,
The controller determines whether the motor current is overcurrent by comparing the motor current with a preset threshold, and the threshold is set for each preset temperature section,
The overcurrent protection method of a clutch control system, characterized in that the threshold value is set according to a damage index area set for the controller and the motor for each temperature section.