JP2010096123A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor preventing a worker from receiving an electric shock and improving safety even when disconnection of a harness or a coming-off of a connector occurs. <P>SOLUTION: The electric compressor 1 is provided with: a compression mechanism part 2 for compressing gas; a motor part 3 for driving the compression mechanism part 2; and a motor control part 5 for controlling the drive of the motor part 3. The motor control part 5 has: a control part 29 connected with power supply 24 through the harness 23 and controlling the electric current to be supplied into the motor part 3; and an output circuit 31 for supplying electric current into the motor part 3, based on control signals from the control part 29. The motor control part 5 is provided with: a detection part 35 for detecting release of the connection of the harness 23 and the control part 29; and a detected charging/discharging circuit 37 for storing or discharging residual voltage in the motor control part 5, based on the results of detection by the detection part 35. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor used for a vehicle air conditioner or the like.

  The electric compressor compresses a refrigerant and supplies it to the vehicle interior for air conditioning in the vehicle, and is generally arranged in the engine room of the vehicle. The electric compressor includes a compression mechanism section that compresses refrigerant, a motor that rotates a rotor of the compression mechanism section, a capacitor that supplies power to the motor, an inverter circuit, and the like, and these are provided in a case. A harness for supplying electric power to the electric compressor is routed outside the case, and battery power can be supplied to the electric compressor by connecting the harness to a connector provided on the outer side of the case.

Since a high voltage is applied to the harness in the electric compressor, it is necessary to protect the harness from impact and external force. For this reason, Patent Document 1 proposes that an aluminum pipe for circulating the refrigerant is arranged on the front side of the vehicle and a harness is arranged on the rear side of the aluminum pipe. According to this structure, it is possible to reduce the load input to the harness by receiving the impact caused by the front collision with the aluminum pipe.
JP 2008-2343 A

  However, in the conventional structure, when an impact force greater than the proof stress of the aluminum pipe is input to the aluminum pipe by a frontal collision, the aluminum pipe may be deformed and contact the harness on the rear side. If the contact load is excessive and acts on the harness, the harness may be disconnected or the harness may be disconnected from the connector. When the disconnection of the harness or the disconnection from the connector occurs, there is a possibility that a problem of electric shock is generated in the harness or the connector. This is because a voltage remains in the control circuit of the electric compressor, and this residual voltage is applied to a harness or a connector that is electrically connected to the electric compressor.

  Accordingly, an object of the present invention is to provide an electric compressor that can prevent an electric shock and improve safety even when a disconnection of a harness or a disconnection from a connector occurs.

  The invention according to claim 1 includes a compression mechanism section that compresses gas, a motor section that drives the compression mechanism section, and a motor control section that controls driving of the motor section, and the motor control section And an electric compressor having a control unit that is connected via a harness and controls a current supplied to the motor, and an output circuit that supplies a current to the motor based on a control signal from the control unit, A detection unit that detects that the connection between the harness and the control unit is released, and a detection charge / discharge circuit that stores or discharges a residual voltage in the motor control unit based on a detection result of the detection unit. It is provided in the control unit.

  A second aspect of the present invention is the first aspect of the present invention, wherein the detection unit detects a potential difference between voltages applied to the control unit, a first threshold value at which the motor can be normally operated, and an abnormal state. When the potential difference is smaller than the first threshold value, it is detected that the connection between the harness and the control unit is released, and the potential difference is the first threshold value. When it is smaller than two threshold values, it is detected that the storage or discharge of the residual voltage by the detection charging / discharging circuit is completed.

  Invention of Claim 3 is invention of Claim 1 or 2, Comprising: The said detection charging / discharging circuit is a forced operation circuit which forcibly drives a motor with the residual voltage in a motor control part, Compulsory motor is forced The residual voltage in the motor control unit is discharged by operating the motor automatically.

  Invention of Claim 4 is invention of Claim 1 or 2, Comprising: The said detection charging / discharging circuit consists of an electrical resistor and the switch which applies a residual voltage to this electrical resistor, The said electrical resistance The residual voltage in the motor controller is discharged by the body.

  Invention of Claim 5 is invention of Claim 1 or 2, Comprising: The said detection charging / discharging circuit is provided between harnesses, and the capacitor charged with the residual voltage in a motor control part is applied, and this It is characterized by comprising a switch for separating the capacitor from between the harnesses.

  According to the present invention, the detection unit detects that the connection between the harness and the control unit is released, and the detection charge / discharge circuit stores the residual voltage remaining in the motor control unit based on the detection result. Or since it discharges, a residual voltage is not applied to a harness or a connector. For this reason, even if the harness is disconnected or the harness is disconnected from the connector, there is no electric shock, and safety is improved.

  Hereinafter, the present invention will be described in detail with reference to embodiments illustrated in the drawings. In each embodiment, the same member is assigned the same reference numeral.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of the electric compressor 1 according to the first embodiment of the present invention, and FIG. 2 is a flowchart showing the control of the electric compressor.

  The electric compressor 1 according to this embodiment includes a compression mechanism unit 2 that compresses gas, a motor unit 3, and a motor control unit 5 that controls driving of the motor unit 3.

  FIG. 7 is a cross-sectional view showing the internal structure of the electric compressor 1 corresponding to FIG. 1, and the motor control unit 5, the compression mechanism unit 2, and the motor unit 3 are sequentially connected from the left side.

  As shown in FIG. 7, the compression mechanism unit 2 includes a cylinder housing 11 and a rotor 12 provided in the cylinder housing 11.

  The cylinder housing 11 is formed by a cylindrical cylinder block 13 and a front side block 14 and a rear side block 15 provided on both front and rear sides of the cylinder block 13. A cylinder chamber 16 is formed by the cylinder block 13, the front side block 14, and the rear side block 15, and the rotor 12 is rotatably accommodated in the cylinder chamber 16. The rotor 12 integrally includes a shaft 17 that is rotatably supported by the front side block 14 and the rear side block 15, and the rotor 12 rotates when a rotational driving force is transmitted to the shaft 17. The refrigerant is compressed by the rotation of the rotor 12 and discharged to the refrigeration cycle. A rotational driving force is transmitted from the motor unit 3 to the shaft 17.

  As shown in FIG. 7, the motor unit 3 includes a coil 19 and a motor rotor 20. The motor rotor 20 is integrally provided with a drive shaft 21 that coaxially connects the shaft 17. Therefore, when the motor rotor 20 rotates, the shaft 17 and the rotor 12 of the compression mechanism unit 2 rotate to compress the refrigerant.

  As shown in FIG. 1, the motor control unit 5 is connected to an in-vehicle power source (battery) 24 via a harness 23. The harness 23 and the motor control unit 5 are connected via the connector 25. As shown in FIG. 8, the connector 25 and the harness 23 are disposed outside the case of the electric compressor 1, and the power supply 24 and the motor control unit 5 are electrically connected by inserting the harness 23 into the connector 25. Can do.

  The motor control unit 5 includes a capacitor 27 that stores current, a control unit 29, and an output circuit 31. The capacitor 27 is arranged on the upstream side of the control unit 29 and supplies the stored current to the motor unit 3 as appropriate. The control unit 29 is formed by a microcomputer chip mounted on the printed circuit board 32. The control unit 29 is connected to the power source 24 via the harness 23 and controls the current supplied to the motor unit 3. The output circuit 31 is connected between the control unit 29 and the motor unit 3, receives a control signal from the control unit 29, and supplies a current to the motor unit 3 based on the input control signal. Thereby, the motor unit 3 is rotationally driven.

  In this embodiment, the control part 29 is provided with the detection part 35 and the forced operation circuit 37 as a detection charging / discharging circuit. The detection unit 35 detects that the connection between the harness 23 and the control unit 29 has been released. That is, the detection unit 35 detects that the harness 23 is disconnected due to an impact such as a collision or that the harness 23 is disconnected.

  The forced operation circuit 37 forcibly drives the motor unit 3 based on the detection result of the detection unit 35. The current for forced operation of the motor unit 3 is supplied based on the residual voltage of the capacitor 27, and the residual voltage in the capacitor 27 can be discharged by forcibly operating the motor unit 3.

  The detection of the connection between the harness 23 and the control unit 29 by the detection unit 35 is performed by comparing the potential difference between the voltages (+) and (−) between the harnesses 23 applied to the control unit 29 with the first threshold value. Further, it is performed by comparing with the second threshold value. The first threshold value is a voltage at which the motor unit 3 can be normally operated, and the second threshold value is a voltage in an abnormal state due to the disconnection.

  Hereinafter, the control of this embodiment will be described with reference to the flowchart of FIG.

  In step S11, the potential difference of the applied voltage between the harnesses 23 is compared with the first threshold value, and when the applied voltage is greater than the first threshold value, the detection unit 35 detects that the harness 23 is not disconnected. . Based on the detection result, the process proceeds to step S12, and the normal operation of the motor unit 3 is performed.

  When the potential difference between the applied voltages is smaller than the first threshold value, the detection unit 35 detects that the harness 23 has been disconnected. Based on the detection result, the process proceeds to step S13.

  In step S <b> 13, the forced operation circuit 37 forcibly operates the motor unit 3 through the output circuit 31. The forced operation of the motor unit 3 is performed based on the residual voltage of the capacitor 27 provided in the motor control unit 5. During the forced operation of the motor unit 3 in step S13, the potential difference of the applied voltage is compared with the second threshold value (step S14).

  In step S14, when the potential difference between the applied voltages is smaller than the second threshold value, the residual voltage of the capacitor 27 is in a discharged state, whereby the process proceeds to step S16 and the forced operation of the motor unit 3 is stopped. . On the other hand, when the potential difference between the applied voltages is larger than the second threshold value, since the residual voltage remains in the capacitor 27, the process proceeds to step S11 and is compared with the first threshold value.

  In the normal operation of step S12, the presence or absence of the compressor signal is detected (step S15), and when the compressor signal is present, the motor unit 3 is driven. Comparison with one threshold is performed. On the other hand, when there is no compressor signal, the motor unit 3 is not driven, and the process is terminated.

  In such an embodiment, the detection unit 35 detects the disconnection of the harness 23 and the control unit 29, and when the disconnection is detected, the forced operation circuit 37 causes the motor unit 3 to be driven by the residual voltage of the capacitor 27. Since the forced operation is performed, the residual voltage of the capacitor 27 can be discharged. For this reason, no residual voltage is applied to the harness 23 or the connector 25. Thereby, even if the harness 23 is disconnected or the harness 23 is disconnected from the connector 25, there is no electric shock due to the residual voltage of the capacitor 27, and safety is improved.

[Second Embodiment]
FIG. 3 is a block diagram showing the configuration of the electric compressor 1A according to the second embodiment of the present invention, and FIG. 4 is a flowchart showing the control.

  As shown in FIG. 3, in this embodiment, an electrical resistor 41 as a detection charge / discharge circuit and a switch 42 are arranged between the capacitor 27 and the control unit 29. The electric resistor 41 and the switch 42 are connected in series, and are connected in parallel with the capacitor 27 in this series connection state. The switch 42 is connected to the detection unit 35 and is opened and closed by a signal from the detection unit 35. In this case, the switch 42 is normally open. Therefore, the electrical resistor 41 and the capacitor 27 are electrically separated.

  Also in this embodiment, the detection unit 35 detects the disconnection of the harness 23 and the control unit 29, and the (+) and (-) voltage between the harnesses 23 applied to the control unit 29 is detected. This is done by comparing the potential difference with the first threshold and then with the second threshold. The first threshold value is a voltage at which the motor unit 3 can be normally operated, and the second threshold value is a voltage in an abnormal state due to the disconnection.

  Hereinafter, the control of this embodiment will be described with reference to the flowchart of FIG.

  In step S21, the potential difference of the applied voltage between the harnesses 23 is compared with the first threshold value, and when the applied voltage is larger than the first threshold value, the detection unit 35 detects that the harness 23 is not disconnected. . Based on the detection result, the process proceeds to step S22, and the normal operation of the motor unit 3 is performed.

  When the potential difference between the applied voltages is smaller than the first threshold value, the detection unit 35 detects that the harness 23 has been disconnected. Based on the detection result, the process proceeds to step S23.

  In step S23, the control unit 29 closes the switch 42. When the switch 42 is closed, a current based on the residual voltage of the capacitor 27 flows through the electric resistor 41 and is consumed. Thereby, the residual voltage of the capacitor 27 is discharged. During the discharge of the capacitor 27, the potential difference of the applied voltage is compared with the second threshold value (step S24).

  In step S24, when the potential difference between the applied voltages is smaller than the second threshold value, the residual voltage of the capacitor 27 is in a discharged state, thereby terminating the process. On the other hand, when the potential difference between the applied voltages is larger than the second threshold value, since the residual voltage remains in the capacitor 27, the process proceeds to step S21 and is compared with the first threshold value.

  In the normal operation of step S22, the presence or absence of the compressor signal is detected (step S25), and when the compressor signal is present, the motor unit 3 is driven. Comparison with one threshold is performed. On the other hand, when there is no compressor signal, the motor unit 3 is not driven, and the process is terminated.

  The switch 42 can be a transistor, a MOSFET, or the like.

  In such an embodiment, when the detection unit 35 detects the disconnection between the harness 23 and the control unit 29, the switch 42 is closed, and the closed state causes the current of the capacitor 27 to flow to the electrical resistor 41. Is consumed. Thereby, since the residual voltage of the capacitor 27 can be discharged, the residual voltage is not applied to the harness 23 or the connector 25. Therefore, even if the harness 23 is disconnected or the harness 23 is disconnected from the connector 25, there is no electric shock due to the residual voltage of the capacitor 27, and safety is improved.

[Third Embodiment]
FIG. 5 is a block diagram showing the configuration of the electric compressor 1B according to the third embodiment of the present invention, and FIG. 6 is a flowchart showing the control.

  As shown in FIG. 5, in the electric compressor 1 </ b> B of this embodiment, switches 45 and 46 as detection charge / discharge circuits are inserted in a circuit that connects the capacitor 27 to the harness 23. The switches 45 and 46 are inserted in the circuit so as to sandwich the capacitor 27, and each is connected to the detection unit 35, and is opened and closed by a signal from the detection unit 35. In this case, the switches 45 and 46 are normally closed. Therefore, the capacitor 27 is charged in the normal time.

  Also in this embodiment, the detection unit 35 detects the disconnection of the harness 23 and the control unit 29, and the (+) and (-) voltage between the harnesses 23 applied to the control unit 29 is detected. This is done by comparing the potential difference with the first threshold and then with the second threshold. The first threshold value is a voltage at which the motor unit 3 can be normally operated, and the second threshold value is a voltage in an abnormal state due to the disconnection.

  Hereinafter, the control of this embodiment will be described with reference to the flowchart of FIG.

  In step S31, the potential difference of the applied voltage between the harnesses 23 is compared with a first threshold value, and when the applied voltage is greater than the first threshold value, the detection unit 35 detects that the harness 23 is not disconnected. . Based on the detection result, the process proceeds to step S32, and the normal operation of the motor unit 3 is performed.

  When the potential difference between the applied voltages is smaller than the first threshold value, the detection unit 35 detects that the harness 23 has been disconnected. Based on the detection result, the process proceeds to step S33.

  In step S33, the switches 45 and 46 are opened by the control unit 29. Due to the open state of the switches 45 and 46, the capacitor 27 is electrically disconnected from the harness 23, the connector 25, and the control unit 29, and maintains an isolated power storage state. Thereby, the residual voltage of the capacitor 27 is not applied to the harness 23 or the connector 25.

  On the other hand, in the normal operation of step S32, the presence / absence of the compressor signal is detected (step S34), and when the compressor signal is present, the motor unit 3 is driven. Is compared with the first threshold value. On the other hand, when there is no compressor signal, the motor unit 3 is not driven, and the process is terminated.

  Note that a transistor, a MOSFET, or the like can be used for the switches 45 and 46.

  In such an embodiment, when the detection unit 35 detects the disconnection between the harness 23 and the control unit 29, the switches 45 and 46 are opened, and the open state causes the capacitor 27, the harness 23, and the connector 25 to be opened. The connection is disconnected. For this reason, the residual voltage of the capacitor 27 is not applied to the harness 23 or the connector 25. Therefore, even if the harness 23 is disconnected or the harness 23 is disconnected from the connector 25, there is no electric shock due to the residual voltage of the capacitor 27, and safety is improved.

It is a block diagram which shows the structure of the electric compressor of 1st Embodiment of this invention. It is a flowchart which shows control of 1st Embodiment. It is a block diagram which shows the structure of the electric compressor of 2nd Embodiment of this invention. It is a flowchart which shows control of 2nd Embodiment. It is a block diagram which shows the structure of the electric compressor of 3rd Embodiment of this invention. It is a flowchart which shows control of 3rd Embodiment. It is sectional drawing which shows the structure inside an electric compressor. It is a perspective view which shows the external appearance of an electric compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Electric compressor 2 Compression mechanism part 3 Motor 5 Motor control part 23 Harness 24 Power supply 25 Connector 27 Capacitor 29 Control part 31 Output circuit 35 Detection part 37 Forced operation circuit 41 Electrical resistor 42, 45, 46 Switch

Claims (5)

A compression mechanism (2) for compressing the gas;
A motor unit (3) for driving the compression mechanism unit (2);
A motor control unit (5) for controlling the drive of the motor unit (3),
The motor control unit (5) is connected to a power source (24) via a harness (23) and controls a current supplied to the motor unit (3). The control unit (29) An electric compressor (1, 1A, 1B) having an output circuit (31) for supplying a current to the motor unit (3) based on a control signal from
A detection unit (35) that detects that the connection between the harness (23) and the control unit (29) is released, and based on the detection result of the detection unit (35), the motor control unit (5) An electric compressor (1, 1A, 1B) characterized in that a detection charge / discharge circuit (37, 41, 42, 45, 46) for storing or discharging the residual voltage is provided in the motor control unit (5). The electric compressor (1, 1A, 1B) according to claim 1,
The detection unit (35) converts the potential difference of the voltage applied to the control unit (29) into a first threshold value at which the motor unit (3) can be normally operated and a second threshold value in an abnormal state. In comparison, when the potential difference is smaller than the first threshold value, it is detected that the connection between the harness (23) and the control unit (29) is released, and the potential difference is the second value. The electric compressor (1, 1A, 1B) characterized by detecting that the storage or discharge of the residual voltage by the detection charge / discharge circuit (37, 41, 42, 45, 46) is finished when the threshold value is smaller than the threshold value. ). The electric compressor (1) according to claim 1 or 2,
The said detection charging / discharging circuit is a forced operation circuit (37) which forcibly operates the motor part (3) by the residual voltage in the motor control part (5), and forcibly operates the motor part (3). The electric compressor (1) characterized by discharging the residual voltage in the motor control unit (5). The electric compressor (1A) according to claim 1 or 2,
The detection charging / discharging circuit includes an electric resistor (41) and a switch (42) for applying a residual voltage to the electric resistor (41), and the electric resistor (41) controls the motor controller (5). An electric compressor (1A) characterized by discharging a residual voltage inside. The electric compressor (1B) according to claim 1 or 2,
The detection charging / discharging circuit is provided between the harness (23) and charged by applying a residual voltage in the motor control unit (5), and the capacitor (27) is connected between the harness (23). An electric compressor (1B) comprising switches (45, 46) for disconnecting from the electric compressor.

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