JP2004282866A - Inverter device and electric compressor control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inverter device that enables an electric compressor to be stopped immediately. <P>SOLUTION: This inverter device is equipped with an interface circuit 22, into which start/stop information (STB) on the electric compressor 10 is inputted; an interface circuit 21, into which the target rotational speed of the electric compressor 10 is input, a microcomputer 23 into which the objective rotating speed from the interface circuit 21 is inputted and which calculates a control signal, based on the target rotating speed; and a drive circuit 24 into which the control signal from the microcomputer 23 is inputted and which outputs a driving signal for driving the electric compressor 10, based on the control signal. The SBT, outputted from the interface circuit 22, can enter the drive circuit 24, bypassing the microcomputer 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inverter device for controlling a rotation speed of an electric compressor, and is suitably used for an inverter device for controlling an electric compressor mounted on a vehicle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an inverter device for controlling a rotation speed of an electric compressor has been known in Patent Document 1 and the like. Although not described in Patent Literature 1, such an inverter device is generally provided with an electronic control device (hereinafter, referred to as an ECU).
[0003]
The ECU has a start / stop information input circuit for inputting start / stop information indicating whether or not to start the electric compressor, and a speed information input for inputting rotation speed information indicating at what rotational speed the electric compressor is to be operated. And a circuit. The microcomputer of the ECU is configured to input both the start / stop information and the rotation speed information.
[0004]
After confirming that the start / stop information is information for starting the electric compressor, the microcomputer calculates a control signal to the drive circuit based on the rotation speed signal. A control signal is input from the microcomputer to the drive circuit, and the drive circuit outputs a drive signal for driving the electric compressor based on the control signal.
[0005]
Therefore, for example, when start / stop information for starting the electric compressor and rotation speed information for operating the electric compressor at 100 rpm are input to the ECU, the microcomputer checks the start / stop information. Calculates a control signal for instructing 100 rpm and outputs it to the drive circuit.
[0006]
[Patent Document 1]
JP 2000-318435 A
[Problems to be solved by the invention]
Incidentally, the above-mentioned patent document describes an acceleration cut control for stopping an electric compressor during acceleration running to improve acceleration performance. In the inverter device, when the electric compressor is stopped during the acceleration cut control, the same control as the above-described rotation speed control is performed by the ECU, and the start / stop information indicates that the electric compressor is stopped. After confirming that the information is information, a control signal for instructing 0 rpm is calculated based on the rotation speed signal.
[0008]
Therefore, the time required to execute the arithmetic processing and the input / output processing in the microcomputer is lost, and the electric compressor cannot be stopped immediately. For example, during acceleration cut control, sufficient acceleration performance cannot be improved. Such a problem occurred.
[0009]
In view of the above, an object of the present invention is to provide an inverter device capable of immediately stopping an electric compressor.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided an inverter device for controlling a rotation speed of an electric compressor (10) provided in a refrigeration cycle and circulating a refrigerant,
A speed information input unit (21) to which the rotation speed information of the electric compressor (10) is input, and rotation speed information from the speed information input unit (21), and a control signal is calculated based on the rotation speed information. (1) An electronic control means (23) and a drive circuit (24) which receives a control signal from the first electronic control means (23) and outputs a drive signal for driving the electric compressor (10) based on the control signal. A start / stop information input unit (22) for inputting start / stop information of the electric compressor (10) separately from the speed information input unit (21), and a start-up output from the start / stop information input unit (22) The stop information can be input to the drive circuit (24), bypassing the first electronic control means (23).
[0011]
Thereby, when stopping the electric compressor (10), the start / stop information output from the start / stop information input unit (22) is transmitted to the drive circuit (24) by bypassing the first electronic control means (23). When the start / stop information for stopping the electric compressor (10) is input to the drive circuit (24), the drive circuit (24) forcibly stops the electric compressor (10). can do.
[0012]
Therefore, when the electric compressor (10) is stopped, the arithmetic processing and input / output processing in the first electronic control means (23) can be made unnecessary, so that the electric compressor (10) can be immediately stopped.
[0013]
In the invention described in claim 2, the inverter device (20) provided in the refrigeration cycle and controlling the rotation speed of the electric compressor (10) for circulating the refrigerant, and the operation of an actuator different from the electric compressor (10) are operated. An electric compressor control system comprising: a second electronic control means (40) for controlling the electric compressor;
The second electronic control means (40) outputs rotation speed information and start / stop information of the electric compressor (10), and the inverter device (20) includes the second electronic control means (40). A speed information input unit (21) to which rotation speed information output from the controller is input, and a start / stop information input unit (22) to which start / stop information output from the second electronic control means (40) is input. The inverter device (20) has first electronic control means (23) for calculating a control signal based on rotation speed information output from the speed information input section (21), and first electronic control means ( And a drive circuit (24) for outputting a drive signal for driving the electric compressor (10) based on the control signal output from the control signal output from the start / stop information input unit (22). , Characterized in that it enabled the input first electronic control means (23) to the bypass to the drive circuit (24).
[0014]
Thereby, when stopping the electric compressor (10), the start / stop information output from the start / stop information input unit (22) is transmitted to the drive circuit (24) by bypassing the first electronic control means (23). When the start / stop information for stopping the electric compressor (10) is input to the drive circuit (24), the drive circuit (24) forcibly stops the electric compressor (10). can do.
[0015]
Therefore, when the electric compressor (10) is stopped, the arithmetic processing and input / output processing in the first electronic control means (23) can be made unnecessary, so that the electric compressor (10) can be immediately stopped.
[0016]
According to the invention described in claim 3, the second electronic control means (40) outputs stop information to the start / stop information input section (22) when the electric compressor (10) is to be stopped quickly. It is characterized by having.
[0017]
According to the fourth aspect of the invention, the electric compressor (10) is mounted on a vehicle that can travel using a battery as a drive source, and uses the battery as a drive source. The load is exceeded.
[0018]
It should be noted that reference numerals in parentheses of the above-described units are examples showing the correspondence with specific units described in the embodiments described later.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a block diagram of a system for controlling the rotation speed of an electric compressor, and shows an electric compressor control system in which the rotation speed of an electric motor 11 provided in a compressor 10 is controlled by an inverter device 20.
[0021]
The compressor 10 is provided in a refrigeration cycle and circulates a refrigerant. The refrigeration cycle includes a compressor 10 for compressing the refrigerant, a condenser for exchanging heat between the compressed refrigerant and the outside air to condense and liquefy the refrigerant, A gas-liquid separator that separates the cooled refrigerant into gas and liquid and allows only the liquid refrigerant to flow downstream, an expansion valve that decompresses and expands the liquid refrigerant, and an evaporator that exchanges heat between the decompressed and expanded refrigerant and the conditioned air to cool the conditioned air It is composed of a condenser, a cooling fan for blowing outside air to the condenser, and a refrigerant pipe for connecting these.
[0022]
The compressor 10 is an electric compressor driven by an electric motor 11, and an AC voltage from a high-voltage battery 30 is applied to the electric motor 11 via an inverter device 20.
[0023]
The inverter device 20 adjusts the frequency of the AC voltage based on a command from the air conditioner ECU (second electronic control means) 40, and applies an AC power source having the adjusted and changed frequency to the electric motor 11 to rotate the compressor 10. The speed is changed continuously. In addition, the inverter device 20 varies and adjusts the AC voltage, and applies an AC power source having the adjusted and varied frequency to the electric motor 11 so as to continuously change the rotation speed of the compressor 10. A type inverter may be used.
[0024]
The inverter device 20 is connected to an air conditioner ECU 40 that controls the operation of an indoor unit disposed in the room of the vehicle air conditioner, and the inverter device 20 and the air conditioner ECU 40 can communicate with each other through a vehicle LAN, serial communication, or the like. It has become.
[0025]
The air conditioner ECU 40 includes a microcomputer 41 having a CPU, a memory, and the like, and interface circuits 42, 43. The interface circuit 43 outputs start / stop information as to whether or not to start the electric compressor 10 (hereinafter referred to as STB). STB is an on / off signal.
[0026]
The interface circuit 42 outputs rotation speed information indicating the rotation speed at which the electric compressor 10 is operated. The rotation speed information is a target rotation speed IVOn calculated by the microcomputer 41 as described below.
[0027]
That is, the air conditioner ECU 40 receives a switch signal from each switch such as a temperature setting switch, an internal air temperature sensor, an external air temperature sensor, a solar radiation sensor, an evaporator outlet air temperature (post-evaporation temperature) sensor, a water temperature sensor, and a vehicle speed sensor. A signal from a sensor signal or the like is input. Then, based on these signals, the target blowing temperature TAO of the air blown into the vehicle compartment is calculated. Then, the target post-evaporation temperature TEO is calculated based on the target outlet temperature TAO and the like, and the target rotation speed IVOn is calculated based on the target post-evaporation temperature TEO and the actual rotation speed IVRn of the compressor 10 described later. .
[0028]
Inverter device 20 includes an interface circuit (speed information input unit) 21 for inputting target rotation speed IVOn output from air conditioner ECU 40, and an interface circuit (start / stop information input unit) for inputting STB output from air conditioner ECU 40. 22.
[0029]
The inverter device 20 includes a microcomputer (first electronic control unit) 23 having a CPU, a memory, and the like, and a drive circuit 24. The microcomputer 23 has a target rotation speed IVOn output from the interface circuit 21. And the STB output from the interface circuit 22. The microcomputer 23 calculates the control signal to the drive circuit 24 based on the rotation speed signal after confirming that the STB is information for starting the compressor 10.
[0030]
The drive circuit 24 includes switching transistors and the like corresponding to each phase winding of the electric motor 11 that is a three-phase alternating current, and a control signal output from the microcomputer 23 is input to the drive circuit 24. Then, the drive circuit 24 outputs a drive signal for driving the electric motor 11 based on the control signal.
[0031]
Therefore, for example, when the STB for starting the compressor 10 and the target rotation speed IVOn for operating the compressor 10 at 100 rpm are input to the inverter device 20, the microcomputer 23 checks the STB. Calculates a control signal for instructing 100 rpm and outputs it to the drive circuit 24.
[0032]
The interface circuit 22 is also connected to a drive circuit 24 in addition to the microcomputer 23, and the STB output from the interface circuit 22 can be input to the drive circuit 24 bypassing the microcomputer 23. . When the STB for stopping the compressor 10 is input to the drive circuit 24, the drive circuit 24 forcibly stops the electric motor 11.
[0033]
FIG. 2 is a flowchart showing the operation of the microcomputer 23 of the inverter device 20 and the microcomputer 41 of the air conditioner ECU 40. Steps S11 to S17 show the operation of the microcomputer 23 with a dotted line in FIG. S21 to S28 indicate the operation of the microcomputer 41.
[0034]
First, in steps S11 and S12, the STB and the target rotation speed IVOn are read. When the STB is information indicating that the compressor 10 is to be started (STB = ON), an instruction to operate the compressor 10 at the target rotation speed IVOn is issued, and information indicating that the STB is to stop the compressor 10 (STB = ON). (OFF), the state of STB = OFF is maintained without operating the compressor 10 (steps S13 to S16).
[0035]
Then, the actual rotation speed IVRn of the compressor 10 is read, and the actual rotation speed IVRn is output to the air conditioner ECU 40, which is the upper ECU of the inverter device 20 (step S17).
[0036]
The air conditioner ECU 40 reads the STB and the target rotation speed IVOn in the same manner as the inverter device 20 (steps S21 and S22), and when STB = ON, issues an instruction to operate the compressor 10 at the target rotation speed IVOn, When STB = OFF, the compressor 10 is stopped regardless of the target rotation speed IVOn (steps S23 to S25, S27).
[0037]
Note that the air conditioner ECU 40 can communicate with a hybrid ECU (not shown) via an in-vehicle LAN or the like. Then, the hybrid ECU determines whether or not the vehicle state is a state in which the rotation speed of the compressor 10 should be limited. The states to be restricted include an overload state of the vehicle running load (acceleration cut state), an overdischarge state of the battery, and an abnormality due to a failure of a vehicle component. If the hybrid ECU determines that the state is to be restricted, the hybrid ECU outputs a command signal to the air conditioner ECU to set STB = OFF.
[0038]
In addition, at least one of the inverter device 20 and the air conditioner ECU 40 restricts various states such as an abnormality detection state by the self-diagnosis function of the inverter device 20, an abnormal temperature rise of the IGBT module, and an overpower consumption state of the electric motor 11. It is determined whether or not the state should be. When it is determined that the state is the one to be restricted, STB is set to OFF.
[0039]
Then, when STB from the interface circuit 22 input to the drive circuit 24 is STB = OFF, the drive circuit 24 forcibly drives the target rotation speed IVOn from the microcomputer 23 irrespective of the value. A drive signal for stopping the motor 11 is output.
[0040]
As described above, according to the present embodiment, when the compressor 10 is stopped, the STB output from the interface circuit 22 is input to the drive circuit 24 by bypassing the microcomputer 23. , The compressor 10 can be forcibly stopped by the drive circuit 24.
[0041]
Therefore, when the compressor 10 is stopped, the arithmetic processing and the input / output processing in the microcomputer 23 can be dispensed with, so that the compressor 10 can be stopped immediately. Therefore, for example, at the time of the acceleration cut control, it is possible to sufficiently improve the acceleration performance.
[0042]
(Other embodiments)
In the above embodiment, the STB is input to the microcomputer 23. However, in implementing the present invention, the input of the STB to the microcomputer 23 may be omitted.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control system of an electric compressor 10 according to an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the microcomputer 23 of the inverter device 20 and the microcomputer 41 of the air conditioner ECU 40.
[Explanation of symbols]
10: electric compressor, 20: inverter device,
21 interface circuit (speed information input unit)
22 interface circuit (start / stop information input unit)
23: microcomputer (control means); 24: drive circuit.

Claims (4)

An inverter device for controlling a rotation speed of an electric compressor (10) provided in a refrigeration cycle and circulating a refrigerant,
A speed information input unit (21) to which rotation speed information of the electric compressor (10) is input;
A first electronic control unit (23) that receives the rotation speed information from the speed information input unit (21) and calculates a control signal based on the rotation speed information;
A drive circuit (24) that receives the control signal from the first electronic control means (23) and outputs a drive signal for driving the electric compressor (10) based on the control signal;
A start / stop information input unit (22) to which start / stop information of the electric compressor (10) is input, separately from the speed information input unit (21);
The start / stop information output from the start / stop information input section (22) can be input to the drive circuit (24), bypassing the first electronic control means (23). Inverter device. An inverter device (20) that is provided in the refrigeration cycle and controls a rotation speed of an electric compressor (10) that circulates refrigerant;
An electric compressor control system including an electric compressor (10) and second electronic control means (40) for controlling operation of another actuator,
The second electronic control means (40) outputs rotation speed information and start / stop information of the electric compressor (10),
The inverter device (20) has a speed information input section (21) to which the rotation speed information output from the second electronic control means (40) is input, and an output from the second electronic control means (40). And a start / stop information input unit (22) to which the start / stop information is input.
The inverter device (20) includes a first electronic control unit (23) that calculates a control signal based on the rotation speed information output from the speed information input unit (21), and a first electronic control unit. A drive circuit (24) for outputting a drive signal for driving the electric compressor (10) based on the control signal output from the means (23);
The start / stop information output from the start / stop information input section (22) can be input to the drive circuit (24), bypassing the first electronic control means (23). Electric compressor control system. The second electronic control means (40) outputs stop information to the start / stop information input section (22) when it is desired to stop the electric compressor (10) quickly. The electric compressor control system according to claim 2. The electric compressor (10) is mounted on a vehicle that can travel using a battery as a drive source, and uses the battery as a drive source.
The electric compressor control system according to claim 3, wherein the time when the vehicle is to be stopped early is a time when the running load of the vehicle exceeds a predetermined load.

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