KR102367739B1 - Method and apparatus for protecting an electric compressor on over current error - Google Patents

Abstract

The present invention is a current protection circuit applied to a driving device of an electric compressor in an air conditioning system for an automobile. The present invention relates to a protection device and method for motor-compressor overcurrent that can protect the motor-compressor by classifying an error of erroneous over-current recognition.
In accordance with the present invention, there is provided an electric compressor overcurrent protection device, comprising: a motor unit provided with an electric motor; a compression unit receiving the driving force of the electric motor to compress the refrigerant; a motor driving unit for driving by supplying power to the electric motor; a current detection unit for detecting a current supplied to the electric motor from the motor driving unit; a storage unit for storing a limited current value set as a criterion for determining overcurrent (OC) in order to compare it with the detected current value; and a main control unit (MCU) for stopping the driving of the electric motor when the current value detected through the current detection unit counts an error exceeding the limit current value and reaches a predetermined number of times characterized.

Description

Method and apparatus for protecting an electric compressor on over current error

The present invention relates to an electric compressor overcurrent protection device and method, and more particularly, as a current protection circuit applied to a driving device of an electric compressor in an automobile air conditioning system, and external noise ( The present invention relates to a protection device and method in case of overcurrent of a motor-compressor that can protect the motor-compressor by classifying an error of erroneous recognition of over-current due to noise) or phase separation and defective driving elements.

In general, there are various types of compressors for air conditioners mounted on automobiles, and they are largely divided into reciprocating and rotary types according to compression methods and structures. In the case of the reciprocating type, there are a crank type, a swash plate type, and a wobble plate type, and in the case of a rotation type, there are a vane rotary type and a scroll type, and there is a variable capacity type that can change the volume.

Also, there is an electric compressor driven by an electric motor as power, and the electric compressor includes a scroll type, a swash plate type, and the like. In the swash plate compressor, a disk-shaped swash plate installed at an angle to a drive shaft that receives engine power selectively by the intermittent action of an electromagnetic clutch or directly receives power from an electric motor is rotated by the drive shaft, and the swash plate rotates by the rotation of the swash plate. A plurality of pistons installed by placing shoes along the circumference of the cylinder block by linear reciprocating motion inside a plurality of bores formed in the cylinder block, it is configured to suck and compress the refrigerant from the evaporator and discharge it toward the condenser.

On the other hand, the current protection circuit applied to the above-described driving device of the electric compressor compares the current flowing in the driving circuit with the limiting current value set as a criterion for determining overcurrent, and the current flowing in the driving circuit when the current flowing in the driving circuit exceeds the limiting current value. It is designed to block

However, if the overcurrent is not actually generated due to overload of the motor-compressor, but the overcurrent is misrecognized due to external noise or phase separation or defective driving element, the overcurrent error is repeated infinitely, which is fatal to the inverter controller. There was a problem causing damage.

Korean Patent Application Laid-Open No. 10-2014-0056446 (published date: 2014.05.12)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, as a current protection circuit applied to a driving device of an electric compressor in an air conditioning system for an automobile, and external noise or phase ( An object of the present invention is to provide a protection device and method in case of overcurrent of an electric compressor that can protect the electric compressor by classifying an error of erroneous recognition of overcurrent due to phase) separation and defective driving element.

In accordance with an aspect of the present invention for achieving the above object, there is provided an electric compressor overcurrent protection device, comprising: a motor unit provided with an electric motor; a compression unit receiving the driving force of the electric motor to compress the refrigerant; a motor driving unit for driving by supplying power to the electric motor; a current detection unit detecting a current supplied to the electric motor from the motor driving unit; a storage unit for storing a limited current value set as a criterion for determining overcurrent (OC) in order to compare it with the detected current value; and a main control unit (MCU) for stopping the driving of the electric motor when the current value detected through the current detection unit counts an error exceeding the limit current value compared to the limit current value and reaches a predetermined number of times characterized.

In addition, the main control unit (MCU) stops the driving of the electric motor when the detected current value is 30 times by counting the error that is exceeded compared with the limited current value.

In addition, the main control unit (MCU) stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit.

In addition, when the current value detected through the current detection unit exceeds the limit current value, the main control unit (MCU) turns on an overcurrent flag (OC Flag) to send an error to the storage unit It records and counts the recorded errors and stops the driving of the electric motor when a certain number of times is reached.

Also, when the main control unit MCU is reset, the coefficient values recorded in the storage unit are initialized.

In addition, the current detection unit detects the current supplied to the electric motor from the motor driving unit, converts it into digital data and transmits it to the main control unit (MCU).

And, when the main control unit (MCU) recognizes an overcurrent state or a noise occur state by comparing the detected current value with the limited current value, from the motor driving unit to the electric motor When the circuit for the supplied current is a closed loop, the count value is set to zero (Count = 0), and the overcurrent (OC) flag is turned on to control the overcurrent detection to be repeated. do.

On the other hand, the electric compressor overcurrent protection method according to the present invention for achieving the above object is an electric compressor overcurrent error detection method for compressing a refrigerant by receiving a driving force of an electric motor, (a) a current detection unit to the electric motor detecting the supplied current; (b) comparing, by the main control unit (MCU), the detected current value with a limit current value set as a criterion for determining overcurrent (OC); (c) counting, by the main control unit (MCU), an error (Error) in which the detected current value exceeds the limit current value; and (d) stopping, by the main control unit (MCU), the driving of the electric motor when the counted error becomes a predetermined number of times.

In addition, in the step (d), the main control unit (MCU) stops the driving of the electric motor when the detected current value is counted 30 times by counting the error in which the detected current value is compared with the limited current value. .

In addition, in step (d), the main control unit (MCU) stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit for driving the electric motor by supplying power.

In addition, in step (c), the main controller (MCU) turns on the overcurrent flag (OC Flag) when the current value detected through the current detection unit exceeds the limit current value by turning on an error ( Error) is recorded in the storage unit, and the recorded error is counted.

Also, when the main control unit MCU is reset, the coefficient values recorded in the storage unit may be initialized.

In addition, in step (a), the current detection unit may detect the current supplied to the electric motor, convert it into digital data, and transmit it to the main control unit (MCU).

And, in step (b), the main controller (MCU) compares the detected current value with the limited current value and recognizes an overcurrent state or a noise occur state, the motor When the circuit for the current supplied from the driving unit to the electric motor is a closed loop, the count value is set to zero (Count=0), and the overcurrent (OC) flag is turned on to Controlled to repeat detection.

According to the present invention, it is possible to distinguish between an overcurrent caused by an overload in the electric compressor driving circuit of an air conditioner for a vehicle and an error erroneously recognized as an overcurrent by the current detection unit.

In addition, it can be confirmed that the overcurrent error is an abnormal condition by classifying it as a fault error rather than repeating it infinitely.

In addition, by setting a specific number of times, when the erroneous recognition of overcurrent reaches a specific number of times, the electric compressor is forcibly shut down to prevent fatal damage to the inverter controller.

1 is a configuration diagram schematically showing the configuration of a protection device in case of an electric compressor overcurrent according to an embodiment of the present invention.
2 is a diagram illustrating an operation flowchart for explaining a method for protecting an electric compressor in case of overcurrent according to an embodiment of the present invention.
3 is a flowchart illustrating a detailed process of operating in a fault mode by counting an overcurrent error during an overcurrent of the electric compressor according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

When a part is referred to as being “above” another part, it may be directly on the other part, or the other part may be involved in between. In contrast, when a part refers to being "directly above" another part, no other part is involved in between.

The terms first, second and third etc. are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

Terms indicating a relative space such as “below” and “above” may be used to more easily describe the relationship of one part shown in the drawing to another part. These terms are intended to include other meanings or operations of the device in use with the meanings intended in the drawings. For example, if the device in the drawings is turned over, some parts described as being "below" other parts are described as being "above" other parts. Thus, the exemplary term “down” includes both the up and down directions. The device may be rotated 90 degrees or at other angles, and terms denoting relative space are to be interpreted accordingly.

Although not defined otherwise, all terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Commonly used terms defined in the dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and unless defined, are not interpreted in an ideal or very formal meaning.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

1 is a configuration diagram schematically showing the configuration of an electric compressor overcurrent protection device according to an embodiment of the present invention.

Referring to FIG. 1 , the electric compressor overcurrent protection device 100 according to the present invention includes a motor unit 110 , a compression unit 120 , a motor driving unit 130 , a current detection unit 140 , and a main control unit (Main Control). Unit: MCU) 150 and the storage unit 160 is included.

The motor unit 110 includes an electric motor M for transmitting driving force to the compression unit 120 .

The compression unit 120 compresses the refrigerant by receiving the driving force of the electric motor.

The motor driving unit 130 is driven by supplying power to the electric motor.

The current detection unit 140 detects a current supplied to the electric motor from the motor driving unit 130 .

At this time, the current detection unit 140 detects the current supplied to the electric motor from the motor driving unit 130 , converts it into digital data, and transmits it to the main control unit (MCU) 150 .

The main control unit 150 counts an error in which the current value detected by the current detection unit 140 exceeds the limit current value by counting and stops the driving of the electric motor when a predetermined number of times is reached.

At this time, the main control unit 150 counts the error in which the detected current value is compared with the limit current value and is exceeded 30 times to stop the driving of the electric motor.

In addition, the main controller 150 stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit 130 .

In addition, when the current value detected by the current detection unit 140 exceeds the limit current value, the main control unit 150 turns on the overcurrent flag (OC Flag) and returns an error to the storage unit 160 ), and the recorded error is counted, and when it reaches a certain number of times, the driving of the electric motor is stopped.

Also, when the main control unit 150 is reset, the coefficient values recorded in the storage unit 160 are initialized.

The storage unit 160 stores a limit current value set as a criterion for determining an overcurrent (OC) in order to compare it with a detected current value.

In addition, the storage unit 160 stores an error value recognized by the main control unit 150 by turning on the overcurrent flag OC Flag in addition to the limited current value or a current value detected through the current detection unit 140 . can be saved

2 is a diagram illustrating an operation flowchart for explaining a method for protecting an electric compressor in case of overcurrent according to an embodiment of the present invention.

Referring to FIG. 2 , in the electric compressor overcurrent error detecting apparatus 100 according to the present invention, the current detecting unit 140 detects a current supplied to the electric motor ( S210 ).

At this time, the current detection unit 140 detects the current supplied to the electric motor from the motor driving unit 130 , converts it into digital data and transmits it to the main control unit (MCU) 150 .

Next, the main controller (MCU) 150 compares the detected current value with a limit current value set as a criterion for determining the overcurrent (OC) (S220).

Here, the limit current value is a current value that is forcibly aligned before starting and set in the constant speed operation section.

Next, the main control unit (MCU) 150 counts an error in which the detected current value exceeds the limit current value (S230).

That is, when the current value detected by the current detection unit 140 exceeds the limit current value, the main control unit (MCU) 150 turns on the overcurrent flag (OC Flag) and stores it as an error. It is recorded in the unit 160, and the recorded error is counted.

In this case, when the main control unit (MCU) 150 is reset, the coefficient values recorded in the storage unit 160 may be initialized.

Next, the main control unit (MCU) 150 stops the driving of the electric motor when the counted error is more than 30 times (S240-Yes) (S250).

That is, the main control unit (MCU) 150 counts the error in which the detected current value is compared with the limit current value and is exceeded 30 times to stop the driving of the electric motor.

At this time, the main control unit (MCU) 150 stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit 130 that supplies power to the electric motor to drive it.

However, when the number of errors is less than 30 times (S240 - No), the main control unit 150 repeats the operation of detecting the overcurrent through the current detection unit 140 .

On the other hand, the main control unit (MCU) 150 stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit 130 and then the overcurrent (OC) coefficient value recorded in the storage unit 160 . Initialize (S260).

In the case of the present invention, an overcurrent error due to an overload after entering a normal state through an initial start-up and an error mistakenly recognized as an overcurrent by the current detection unit 140 during initial start-up of the motor-compressor are distinguished. After a certain period of time has elapsed by counting the error, the motor-compressor is forcibly shut down.

That is, an overcurrent error caused by an overload and an overcurrent error caused by external noise are divided based on the occurrence time of the overcurrent error. In the case of external noise, faulty bolt grounding, separation of one of the three phases of the inverter, failure of the drive unit, etc. apply. It determines the error that occurs during startup, and when it exceeds a specific value, forcibly stops the motor and stores the error in the storage unit. to keep the error signal by writing to

3 is a flowchart illustrating a detailed process of operating in a fault mode by counting an overcurrent error during an overcurrent of the electric compressor according to an embodiment of the present invention.

Referring to FIG. 3 , the electric compressor overcurrent error detection apparatus 100 according to the present invention detects the current supplied to the electric motor through the current detection unit 140 to detect an overcurrent state or a noise occurrence state (Noise). Occur) is recognized (S310).

That is, the current detection unit 140 detects the current supplied to the electric motor from the motor driving unit 130, converts it into digital data, and transmits it to the main control unit (MCU) 150, and the main control unit (MCU) 150 detects The current value is compared with the limit current value set as the criterion for determining the overcurrent (OC), and the overcurrent or noise occur is recognized according to the result.

Then, when the circuit for the current supplied to the electric motor from the motor driving unit 130 is a closed loop (S320 - Yes), the main control unit (MCU) 150 sets the count value to zero (0) and (Count=0), when the overcurrent is detected, the overcurrent (OC) flag is turned on (S330).

However, when the circuit for the current supplied to the electric motor is not a closed loop (S320 - No), the main control unit (MCU) 150 counts the repeated overcurrent (Repeat OC) (S340) ).

At this time, the main control unit (MCU) 150 stops the operation of comparing the detected current value with the limited current value (eComp Stop), and maintains the delay (3 sec Delay) state for about 3 seconds (S350).

Next, the main control unit (MCU) 150 turns on the repeat overcurrent (ROC) fault (Fault) flag when the count value (Count) of the repeated overcurrent (Repeat OC) exceeds 30 times (S360-Yes) ON) (S370), and operates in a fault mode (Fault Mode) to stop the driving of the electric motor (S380).

However, when the count value (Count) of the repeated overcurrent (Repeat OC) is less than 30 times (S360-No), the main controller (MCU) 150 turns on the overcurrent (OC) flag and starts the overcurrent detection step return to

In this case, when the main control unit (MCU) 150 is reset, the coefficient values recorded in the storage unit 160 may be initialized.

In addition, the main control unit (MCU) 150 detects an overcurrent error more than 30 times, controls the electric motor so that power is not supplied from the motor driving unit 130 (Shutdown) to stop the driving of the electric motor, and then counts The overcurrent error count is initialized.

In the case of the present invention, an overcurrent error due to an overload after entering a normal state through an initial start-up and an error mistakenly recognized as an overcurrent by the current detection unit 140 during initial start-up of the motor-compressor are distinguished. After a certain period of time has elapsed by counting the error, the motor-compressor is forcibly shut down.

As described above, according to the present invention, as a current protection circuit applied to a driving device of an electric compressor in an automobile air conditioning system, external noise or phase separation and It is possible to realize a protection device and method in case of overcurrent of the motor-compressor that can protect the motor-compressor by classifying an error of erroneously recognizing overcurrent due to a defective driving element.

Those skilled in the art to which the present invention pertains should understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof, and therefore the embodiments described above are illustrative in all respects and not restrictive. only do The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: protection device in case of motor-compressor overcurrent
110: motor unit
120: compression unit
130: motor driving unit
140: current detection unit
150: main control unit (MCU)
160: storage

Claims (14)

a motor unit provided with an electric motor;
a compression unit receiving the driving force of the electric motor to compress the refrigerant;
a motor driving unit for driving by supplying power to the electric motor;
a current detection unit for detecting a current supplied to the electric motor from the motor driving unit;
a storage unit for storing a limited current value set as a criterion for determining overcurrent (OC) in order to compare it with the detected current value; and
and a main control unit (MCU) for controlling the driving of the electric motor,
The main control unit,
Detecting an error in which the current value detected through the current detection unit exceeds the limit current value,
Determining whether the circuit for the current supplied to the electric motor is a closed circuit at the time of detecting the error,
In the case of a closed circuit, it is judged as overcurrent due to overload of the motor-compressor,
If it is not a closed circuit, it is determined as an erroneous recognition error, the error is counted, and when the error count is a certain number of times, the motor-driven compressor overcurrent protection device stops the driving of the electric motor.
The method according to claim 1,
The main control unit (MCU) is a motor-compressor overcurrent protection device, characterized in that the detected current value is compared with the limit current value and counts an error exceeding the limit and stops the driving of the electric motor when it reaches 30 times .
The method according to claim 1,
The main control unit (MCU) is an electric compressor overcurrent protection device, characterized in that the control so that the power is not supplied to the electric motor from the motor driving unit to stop the driving of the electric motor.
The method according to claim 1,
The main control unit (MCU) writes an error to the storage unit by turning on an overcurrent flag (OC Flag) when the current value detected through the current detection unit is exceeded compared to the limit current value, and , The motor-compressor overcurrent protection device, characterized in that by counting the recorded errors and stopping the driving of the electric motor when a certain number of times is reached.
5. The method according to claim 4,
When the main control unit (MCU) is reset (Reset), the motor-driven compressor overcurrent protection device, characterized in that the value recorded in the storage unit is initialized.
The method according to claim 1,
The current detection unit detects the current supplied to the electric motor from the motor driving unit, converts it into digital data and transmits it to the main control unit (MCU).
delete An electric compressor overcurrent error detection method for compressing a refrigerant by receiving a driving force of an electric motor, the method comprising:
(a) detecting a current supplied to the electric motor by a current detection unit;
(b) comparing, by the main control unit (MCU), the detected current value with a limit current value set as a criterion for determining overcurrent (OC);
(c) detecting, by the main control unit (MCU), an error in which the detected current value exceeds the limit current value; and
(d) At the time of detecting the error, it is determined whether the circuit for the current supplied to the electric motor is a closed circuit. Thus, the main control unit (MCU) counting the error as an error, and stopping the driving of the electric motor when the error count reaches a certain number of times;
A protection method in case of overcurrent of an electric compressor comprising a.
9. The method of claim 8,
In the step (d), the main control unit (MCU) counts the error in which the detected current value is compared with the limited current value and is exceeded 30 times, it characterized in that the driving of the electric motor is stopped How to protect the motor in case of overcurrent.
9. The method of claim 8,
In the step (d), the main controller (MCU) stops the driving of the electric motor by controlling so that power is not supplied to the electric motor from the motor driving unit for driving the electric motor by supplying power How to protect against electric compressor overcurrent.
9. The method of claim 8,
In the step (c), the main control unit (MCU) turns on an overcurrent flag (OC Flag) when the current value detected through the current detection unit exceeds the limit current value by turning on an error (Error) is recorded in the storage unit, and the recorded error is counted.
12. The method of claim 11,
When the main control unit (MCU) is reset (Reset), the motor-compressor overcurrent protection method, characterized in that the value recorded in the storage unit is initialized.
9. The method of claim 8,
In the step (a), the electric compressor overcurrent protection method, characterized in that the current detection unit detects the current supplied to the electric motor, converts it into digital data and transmits it to the main control unit (MCU).
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