KR20170075292A - Safety speed driving method and system in electric compressor - Google Patents

Abstract

In order to maintain a constant refrigerant discharge amount for an electric compressor of an air conditioner for a vehicle, the torque of the compressor pulsating component is adjusted according to the position information of the motor to compensate through proportional integral compensation for each speed ripple coefficient so that the electric compressor operates at a stable speed And more particularly, to a system and method for stable operation of an electric compressor.
The disclosed electric motor compressor stable speed operating system includes: a motor unit having an electric motor; A compression unit that receives the driving force of the electric motor and compresses the refrigerant; A position detector for detecting a rotor position of the electric motor; A compensating torque phase adjusting unit for adjusting a compensating torque phase in accordance with the detected rotor position; And a control unit for controlling the compensation torque phase to be adjusted through the compensation torque phase adjustment unit according to the detected rotor position when the position of the rotor of the electric motor is detected through the position detection unit.
Therefore, according to the present invention, the motor compressor can be operated at a stable speed by compensating the torque of the pulsating component through proportional integral compensation for each speed ripple coefficient.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric compressor,

The present invention relates to a system and method for stable speed operation of an automotive vehicle compressor, and more particularly, to a system and method for stabilizing a speed ratio of a compressor to an automotive air conditioner by adjusting a torque of a compressor pulsating component to a position information of a motor, And more particularly, to a system and method for stable operation of an electric compressor in which an electric compressor can be operated at a stable speed by compensating through proportional integral compensation for each coefficient.

2. Description of the Related Art Generally, an electric compressor for discharging a refrigerant by a rotational force of an electric motor in a vehicle is composed of a motor unit including a driving motor and a compression unit for compressing the refrigerant. An inverter for adjusting the rotational speed of the driving motor is installed on one side of the compressor housing .

If a high load is applied to the drive motor of the electric compressor, the start failure probability increases, and subsequent start failure may cause damage to the compression unit and the inverter.

Motor compressors can be driven at high speed in high temperature and high humidity area and then can be failed due to turn off at high load condition and high discharge pressure condition at restart. In the stopped state, the pressure of the discharge portion and the suction portion converge to the pressure, and the initial load applied to the driving motor of the electric compressor after a predetermined time is lowered.

However, in the motor-driven compressor, fluctuating components of the torque are generated in the process of discharging and sucking the refrigerant during the compression process, and the rotational speed of the compression unit fluctuates due to the pulsating component.

Therefore, in order to maintain a constant amount of refrigerant discharge, a constant rotation of the compression unit is required. To do so, the ripple factor component of the speed is extracted from the rotor speed information in the inverter, and the compensation torque for the speed pulsation is calculated through integral control.

However, there is a disadvantage in that it is impossible to determine the position of the compensation torque vector and the faster compensation for the speed pulsation.

Korean Patent Laid-Open Publication No. 2014-0095800 (Publication date: 2014.08.04)

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a vehicular air conditioner in which the proportional integral compensation for the speed ripple coefficient is adjusted by adjusting the torque of the compressor pulsating component to the position information of the motor in order to maintain a constant refrigerant discharge amount with respect to the motor- To thereby enable the motor-driven compressor to be operated at a stable speed.

According to an aspect of the present invention, there is provided an electric compressor constant speed operating system including: a motor unit having an electric motor; A compression unit that receives the driving force of the electric motor and compresses the refrigerant; A position detector for detecting a rotor position of the electric motor; A compensating torque phase adjusting unit for adjusting a compensating torque phase in accordance with the detected rotor position; And a control unit for controlling the compensation torque phase to be adjusted through the compensation torque phase adjustment unit according to the detected rotor position when the position of the rotor of the electric motor is detected through the position detection unit.

The control unit calculates a speed information pulsation coefficient according to the detected rotor position, determines a compensation torque amount by coefficient through proportional integral (PI) compensation for each coefficient, And controls the compensation torque phase to be adjusted through the compensation torque phase adjustment unit.

The control unit calculates a phase from the detected rotor position, PIs a proportional integral (PI) of the calculated phase, calculates a compensated torque vector, and calculates a compensated torque amount according to the calculated compensated torque vector .

The controller may further include a motor driving unit for supplying power to the electric motor to rotate the motor, wherein the controller adjusts the current value through the motor driving unit so that the compensating torque phase is adjusted according to the determined compensation torque amount for each coefficient, So as to be supplied to the electric motor.

The control unit may further include a storage unit for storing the decided compensation torque amount by data or storing the compensation torque phase adjusted according to the determined compensation torque amount by coefficient.

According to another aspect of the present invention, there is provided a method for operating a stable compressor of an electric compressor, including: (a) rotationally driving an electric motor in a motor driving unit; (b) detecting a rotor position of the electric motor in a position detection unit; (c) adjusting a compensating torque phase in accordance with the detected rotor position in a compensating torque phase adjusting section; And (d) rotationally driving the electric motor in accordance with the adjusted compensation torque phase in the motor driving section.

In the step (c), the compensation torque phase adjusting unit may calculate a speed information pulsation coefficient according to the detected rotor position, determine a compensating torque amount by coefficient through proportional integral (PI) compensation for each coefficient, , And the compensation torque phase is adjusted according to the determined compensation torque amount by coefficient.

In the step (c), the compensation torque phase adjustment unit calculates a phase from the detected rotor position, PIs a proportional integral (PI) of the calculated phase, calculates a compensation torque vector, The compensation torque amount by coefficient is determined according to the torque vector.

In the step (d), the motor driving unit supplies the electric motor with a power whose current value is adjusted so that the compensation torque phase is adjusted in accordance with the determined coefficient-specific compensation torque amount.

In the step (c), the compensation torque phase adjustment unit may store the determined compensation torque amount for each coefficient in the storage unit, or store the compensated torque phase adjusted according to the determined compensation torque amount for each coefficient in the storage unit as data .

According to the present invention, before the compensation, the speed control output fluctuates due to the pulsating component, and thus, the speed information also fluctuates. However, after the compensation, the compensating torque component is compensated for the speed control output, .

In addition, the proportional integral compensation for each speed ripple coefficient enables the motor compressor to operate at a stable speed.

In addition, faster compensation torque calculation is possible through proportional integral compensation per speed ripple coefficient.

Further, by applying the calculated compensation torque to the sensorless estimation performance, an adjustable rotation angle is applied, and the compensation torque is rotated at an angle capable of adjusting the compensation torque vector, so that the torque compensation can be more robust and stable.

1 is a block diagram schematically showing the configuration of a stable speed operating system for an electric compressor according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an operation of a stabilized speed operation of an electric compressor according to an embodiment of the present invention. Referring to FIG.
3 is a diagram illustrating an example of adjusting the compensation torque phase to match the rotor position of the detected motor according to an embodiment of the present invention.
4 is a diagram illustrating an example of rotation control of a motor at a rotation angle whose compensation torque phase is adjusted according to an embodiment of the present invention.
5 is a diagram illustrating an example in which a torque component is compensated according to a speed control output of a motor to reduce a speed component according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a process of determining a compensated torque amount per coefficient through proportional integral compensation for each coefficient with respect to a velocity information pulsation coefficient according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating an example of rotationally controlling a motor at a rotation angle whose compensation torque phase is adjusted according to an embodiment of the present invention.
8 is a diagram illustrating an example in which a torque component is compensated according to a speed control output of a motor to reduce a speed component according to an embodiment of the present invention.
9 is a diagram illustrating an example in which the compensation torque phase is adjusted according to the coefficient-by-coefficient compensation torque amount determined according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

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

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain parts that are described as being "below" other parts are described as being "above " other parts. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a block diagram schematically showing the configuration of a stable speed operating system for an electric compressor according to an embodiment of the present invention.

Referring to FIG. 1, an electric compressor stable cruise control system 100 according to the present invention includes a motor unit 110, a motor driving unit 112, a compression unit 120, a position detection unit 130, A controller 140, a controller 150, and a storage unit 160.

The motor unit 110 includes an electric motor that is supplied with electric power and provides rotational force.

The motor driving unit 112 supplies power to the electric motor to rotate the electric motor.

The compression unit 120 receives the driving force of the electric motor and compresses the refrigerant.

The position detection unit 130 detects the rotor position of the electric motor.

The compensation torque phase adjustment unit 140 adjusts the compensation torque phase to match the detected rotor position.

When the rotor position of the electric motor is detected through the position detecting unit 130, the controller 150 controls the overall operation of the apparatus. The controller 150 adjusts the compensated torque phase .

Further, the controller 150 calculates the speed information pulsation coefficient according to the detected rotor position, determines the compensation torque amount by the coefficient through the proportional integral (PI) compensation for each coefficient, And controls the compensation torque phase to be adjusted through the compensation torque phase adjustment unit 140.

Further, the control unit 150 calculates a phase from the detected rotor position, PIs the proportional integral (PI) of the calculated phase, calculates a compensated torque vector, and calculates a compensated torque according to the calculated compensated torque vector .

In addition, the controller 150 controls the motor driving unit 112 so that a power source whose current value is adjusted is supplied to the electric motor so that the compensation torque phase is adjusted according to the determined compensation torque amount by coefficient.

The storage unit 160 stores the determined compensated torque amount as data or stores the compensated torque phase adjusted according to the determined compensated torque amount as data.

FIG. 2 is a flowchart illustrating an operation of a stabilized speed operation of an electric compressor according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, in the motor-driven compressor stable speed operation system 100, the motor driving unit 112 drives the electric motor to rotate (S210).

Next, the position detector 130 detects the rotor position of the electric motor (S220).

At this time, the compensation torque phase adjuster 140 calculates the velocity information pulse wave coefficient (? _C ,? _S ) according to the following equations (1) and (2) based on the detected rotor position.

Here, the ripple component of the speed information is an ω vector as shown in FIG. 3, which increases or decreases in size in the D / Q frame and rotates in the α / β frame. 3 is a view showing a velocity information pulsation component according to an embodiment of the present invention. In Fig. 3, the? -Axis of the? /? Frame indicates a value obtained by projecting a component oscillating on the real axis of the? Vector, and? A indicates the vector magnitude of the velocity information pulse.

At this time, the compensation torque phase adjuster 140 refers to the trigonometric function as shown in the following Equation 3 to calculate the velocity information pulsation component.

Accordingly, the compensation torque phase adjusting unit 140 obtains a relation of the speed information pulse wave coefficient according to Equation (4) for the speed information ripple component with reference to Equation (3).

Then, the compensation torque phase adjuster 140 multiplies the 2 * cos () and 2 * sin () by the low-pass filter having a cut-off frequency much smaller than the frequency of? _M Pass Filter). By referring to Equation (5), the velocity information pulse wave coefficient? _C of Equation (1) is calculated.

That is, by passing a low-pass filter having a cut-off frequency much smaller than the frequency of? _M , the DC component can be obtained.

Further, the compensation torque phase control section 140 when calculating the speed information pulse coefficient, 2 * cos (), 2 low-pass filter having a much smaller cut-off frequency than the frequency of the back ω _m multiplied by a * sin () (Low Pass Filter). The velocity information pulse wave coefficient? _S of Equation (2) is calculated with reference to the following Equation (6).

The velocity information pulsation coefficient? _S can be obtained by passing a low-pass filter having a cut-off frequency much smaller than the frequency of? _M to obtain a DC component.

In the respective equations, Wc and Ws denote velocity information pulsation coefficients, that is, velocity ripple coefficients, and Tc and Ts denote torque vectors.

Next, the compensation torque phase adjuster 140 calculates a velocity information pulse wave coefficient (? _C ,? _S ) based on the detected rotor position and then calculates the proportional integral (? _C ,? _S ) PI compensator, and adjusts the compensated torque phase according to the determined compensated torque amount (Vector Rotate). 4 is a diagram illustrating an example of adjusting the compensation torque phase to match the rotor position of the detected motor according to an embodiment of the present invention.

That is, as shown in FIG. 4, the compensated torque phase adjuster 140 calculates a velocity information pulse wave coefficient vector Wc, Ws (Ripple Vector Detect) and a compensation compensator (PI compensator) (Tc, Ts) according to the coefficient, and adjusts the compensated torque phase according to the determined compensated torque amount (Vector Rotate).

Also, the compensation torque phase adjuster 140 detects the phase of the speed information pulse wave coefficient from the detected rotor position as shown in FIG. 5 (Ripple Phase Detect). 5 is a diagram illustrating an example of detecting the phase of the velocity information pulse wave coefficient according to the embodiment of the present invention. That is, the compensation torque phase adjuster 140 multiplies the detected rotor position by the cosine 2 cos (ω _m t), passes through the low-pass filter to detect the velocity information pulse wave coefficient ω _c , multiplies the sine 2 sin () And passes through the filter to detect the velocity-dependent pulsation coefficient ω _s .

The compensation torque phase adjuster 140 adjusts the speed information pulse wave coefficient W _c and W _s in accordance with the process shown in FIG. And determines the compensation torque amount (Tc, Ts). FIG. 6 is a diagram illustrating a process of determining a compensated torque amount per coefficient through proportional integral compensation for each coefficient with respect to a velocity information pulsation coefficient according to an embodiment of the present invention.

That is, the compensation torque phase adjuster 140 multiplies the velocity information pulse wave coefficient (W _c , W _s ) calculated as described above by proportional integral (PI) compensation for each coefficient according to the following equation (Tc, Ts) is determined.

At this time, the compensation torque phase adjuster 140 defines the PI controller output unit as a torque and selects appropriate Kp, Ki to determine the compensation torque amount (Tc, Ts) for each coefficient.

The compensation torque phase adjustment unit 140 stores the determined compensation torque amount in the storage unit 160 as data or adjusts the compensation torque phase that is adjusted in accordance with the determined compensation amount of each coefficient to the storage unit 160 It can be saved as data.

Next, the motor driving unit 112 rotates the electric motor by compensating the torque according to the adjusted compensating torque phase (S240).

That is, the motor driving unit 112, the determined coefficients of the current value as shown in Figure 7 such that the compensation torque phase adjusted to the specific compensation torque amount (cos ω _m t, sin ω _m t) is the electric an adjusted power To the motor. FIG. 7 is a diagram illustrating an example of rotationally controlling a motor at a rotation angle whose compensation torque phase is adjusted according to an embodiment of the present invention.

Therefore, the speed change output of the electric motor is compensated for by compensating the compensating torque component as shown in Fig. 8, so that the electric compressor can be operated at a stable speed. 8 is a diagram illustrating an example in which a torque component is compensated according to a speed control output of a motor to reduce a speed component according to an embodiment of the present invention.

At this time, the controller 150 controls the compensated torque phase to be adjusted through the compensated torque phase adjuster 140 as shown in FIG. 9 according to the determined compensated torque amounts Tc and Ts. 9 is a diagram illustrating an example in which the compensation torque phase is adjusted according to the coefficient-by-coefficient compensation torque amount determined according to the embodiment of the present invention.

9, the control unit 150 can calculate the compensated torque vector Tc ', Ts' according to the following equation (8).

Further, the controller 150 may adjust the compensated torque phase to a sinusoidal velocity information pulse wave coefficient component according to the following equation (9).

As described above, according to the present invention, in order to maintain a constant refrigerant discharge amount with respect to the electric compressor of the air conditioner for a vehicle, the torque of the compressor pulsating component is adjusted according to the position information of the motor to compensate the proportional integral compensation per speed ripple coefficient, It is possible to realize an electric compressor stable speed operating system and method that enables the compressor to operate at a stable speed.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Electric Compressor Stable Speed Operation System
110:
112:
120:
130:
140: Compensation torque phase adjustment unit
150:
160:

Claims (10)

A motor unit having an electric motor;
A compression unit that receives the driving force of the electric motor and compresses the refrigerant;
A position detector for detecting a rotor position of the electric motor;
A compensating torque phase adjusting unit for adjusting a compensating torque phase in accordance with the detected rotor position; And
A control unit for controlling the compensation torque phase to be adjusted through the compensation torque phase adjustment unit according to the detected rotor position when the rotor position of the electric motor is detected through the position detection unit;
And an electric motor for driving the compressor.
The method according to claim 1,
Wherein the control unit calculates a speed information pulsation coefficient according to the detected rotor position, determines a compensation torque amount by coefficient through proportional integral (PI) compensation for each coefficient, And the compensation torque phase is adjusted through the compensation torque phase adjustment unit.
3. The method of claim 2,
The control unit calculates a phase from the detected rotor position, PIs a proportional integral (PI) of the calculated phase, calculates a compensated torque vector, and determines a compensated torque amount by coefficient according to the calculated compensated torque vector , An electric compressor stable speed operating system.
3. The method of claim 2,
Further comprising a motor driving unit for supplying power to the electric motor to rotate the motor,
Wherein the controller adjusts the compensation torque phase according to the determined compensation torque amount for each coefficient and controls the motor driver to supply a power whose current value is adjusted to the electric motor.
3. The method of claim 2,
A storage unit for storing the determined compensation torque amount by coefficient as data or storing the compensation torque phase adjusted according to the determined compensation torque amount by coefficient;
Further comprising: an electric motor;
(a) rotationally driving an electric motor in a motor driving section;
(b) detecting a rotor position of the electric motor in a position detection unit;
(c) adjusting a compensating torque phase in accordance with the detected rotor position in a compensating torque phase adjusting section; And
(d) rotationally driving the electric motor in accordance with the adjusted compensating torque phase in the motor driving section;
Wherein the compressor is operated at a constant speed.
The method according to claim 6,
In the step (c), the compensation torque phase adjustment unit may calculate a speed information pulsation coefficient according to the detected rotor position, determine a compensating torque amount for each coefficient through proportional integral (PI) compensation for each coefficient, And the compensation torque phase is adjusted according to the determined compensation torque amount by the coefficient.
8. The method of claim 7,
In the step (c), the compensation torque phase adjuster calculates a phase from the detected rotor position, PIs a proportional integral (PI) of the calculated phase, calculates a compensated torque vector, To determine an amount of compensating torque according to the coefficient.
The method according to claim 6,
Wherein in the step (d), the motor drive unit supplies power to the electric motor in which the compensation torque phase is adjusted in accordance with the determined coefficient-specific compensation torque amount and the current value is adjusted.
8. The method of claim 7,
In the step (c), the compensation torque phase adjustment unit may store the determined compensation torque amount for each coefficient in the storage unit or store the compensation torque phase adjusted according to the determined compensation torque amount by coefficient in the storage unit as data A stable speed operating method of an electric compressor.

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