JP2008126871A - Vehicular power supply system and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular power supply system capable of reducing noise generated in an electric circuit mounted to a vehicle, and the vehicle to which the vehicular power supply system is applied. <P>SOLUTION: The vehicular power supply system comprises a power circuit for supplying and receiving power to and from a motor generator to drive a vehicle, a plurality of conductors which are connected to the power circuit to transmit the power supplied and received between the power circuit and the motor generator by a multi-phase AC, and an electric circuit which is mounted to the vehicle and separately provided on the power circuit. The electric circuit is provided at a position where the component in one direction of the magnetic field generated by each of the currents flowing in the plurality of conductors is reduced by each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle power supply system including a power circuit that transmits and receives power to and from a motor generator that drives a vehicle, and an electric circuit that is mounted on the vehicle and provided separately from the power circuit.

  Vehicles that are driven by motor generators are widely used. Such a vehicle is provided with a power circuit that outputs electric power for running the vehicle by rotating the motor generator and collects electric power generated by the motor generator as the vehicle travels. The electric power exchanged between the motor generator and the electric power circuit is transmitted by a conducting wire.

JP 2005-332678 A JP 2004-104918 A JP 2003-34165 A

  In general, an electric circuit for controlling the traveling state of the vehicle is mounted on the vehicle that is driven by the motor generator. When a current flows through a conducting wire that transmits power exchanged between the motor generator and the power circuit, noise may be generated in the control electric circuit due to a magnetic field generated by the current. Therefore, for such a vehicle, the problem of requiring time to design to reduce the noise generated in the control electric circuit, and the design and manufacturing cost for reducing the noise generated in the control electric circuit. There was a problem that became high.

  The present invention has been made for such a problem. That is, an object of the present invention is to provide a vehicle power supply system that can reduce noise generated in an electric circuit mounted on the vehicle, and a vehicle to which such a vehicle power supply system is applied.

  The present invention relates to a power circuit that transmits and receives power to and from a motor generator that drives a vehicle, and power that is connected to the power circuit and that is transmitted and received between the power circuit and the motor generator by a multiphase alternating current. A vehicle power supply system comprising: a plurality of conducting wires for transmission; and an electric circuit mounted on the vehicle and provided separately from the power circuit, wherein each of the electric circuits has a current flowing through each of the plurality of conducting wires. It is characterized in that the generated magnetic field is provided at a position where the magnetic fields are reduced.

  Further, in the vehicle power supply system according to the present invention, a measurement unit that measures an electrophysical quantity appearing in any of the plurality of conductors and outputs a signal including information on a measurement value, and a measurement result of the measurement unit And a control unit that controls the power circuit based on the control circuit, wherein the electric circuit processes a signal output from the measurement unit and outputs the signal to the control unit.

  In addition, the present invention provides a power circuit that transmits and receives power to and from a motor generator that drives a vehicle, and three-phase power that is connected to the power circuit and is transmitted and received between the power circuit and the motor generator. A power supply system for a vehicle, comprising: three conducting wires for transmission by alternating current; and an electric circuit mounted on the vehicle and provided separately from the power circuit, wherein the three conducting wires are the three conducting wires. The triangle whose vertex is at three points where the cross section perpendicular to the extending direction of each of the three conductors intersects is an isosceles triangle, and the electric circuit is a base of the isosceles triangle formed by the triangle Is provided on a straight line perpendicular to the bottom side that bisects.

  Moreover, in the vehicle power supply system according to the present invention, a measurement unit that measures an electrophysical quantity appearing in any of the three conductors and outputs a signal including measurement value information, and a measurement by the measurement unit A control unit that controls the power circuit based on the result, and the electric circuit preferably processes the signal output from the measurement unit and outputs the signal to the control unit.

  In addition, it is preferable that the vehicle according to the present invention includes the vehicle power supply system and the motor generator.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle electric power supply system which can reduce the noise which generate | occur | produces in the electric circuit mounted in a vehicle, and the vehicle which applied such an electric power supply system for vehicles can be provided.

  FIG. 1 shows a configuration of a vehicle drive system according to an embodiment of the present invention. The vehicle drive system includes a vehicle power supply system 100 and a motor generator 14 that exchanges power with the vehicle power supply system 100.

  The power circuit 10 includes a battery 10B and power circuit terminals 10u, 10v, and 10w. The power circuit 10 adjusts the magnitude of the DC voltage output from the battery 10B, and converts it to a three-phase AC voltage having the same amplitude and a phase difference of 120 °. Then, the three-phase AC voltage is output from the power circuit terminals 10u, 10v, and 10w. The power circuit 10 converts the three-phase AC voltage applied to the power circuit terminals 10u, 10v, and 10w into a DC voltage, adjusts the magnitude thereof, applies the voltage to the battery 10B, and charges the battery 10B. The power output from the power circuit 10 through the power circuit terminals 10u, 10v, and 10w, and the power input to the power circuit 10 from the power circuit terminals 10u, 10v, and 10w are adjusted by the adjustment signal ADJ.

  Conductive wires 12u, 12v, and 12w are connected to power circuit terminals 10u, 10v, and 10w, respectively. The ends of conductors 12u, 12v, and 12w that are not connected to power circuit 10 are connected to motor generator terminals 14u, 14v, and 14w of motor generator 14, respectively. Conductive wires 12u, 12v, and 12w supply the power output from power circuit 10 to motor generator 14, and supply the power output from motor generator 14 to power circuit 10. Currents Iu, Iv, and Iw flow through the conducting wires 12u, 12v, and 12w as power is transferred between the power circuit 10 and the motor generator 14, respectively. The currents Iu, Iv, and Iw form a three-phase alternating current having the same amplitude and a phase difference of 120 °.

  FIG. 2 shows a perspective view of the conducting wires 12u, 12v, and 12w and the measurement circuit 18, and FIG. 3 shows a cross section S perpendicular to the extending direction of the conducting wires 12u, 12v, and 12w. The conducting wires 12u, 12v, and 12w are each formed in a rod shape. The cross section perpendicular to the extending direction of the conducting wires 12u, 12v, and 12w can have any shape, and is circular here. The conducting wires 12u, 12v, and 12w are arranged in parallel to each other. The conducting wire 12u is arranged such that the perpendicular bisector C with respect to the line segment VW intersects the central axis of the conducting wire 12u. Here, the point V is a point where the central axis of the conducting wire 12v and the cross section S intersect, and the point W is a point where the central axis of the conducting wire 12w and the cross section S intersect.

  The measurement circuit 18 is arranged at the position of the magnetic field minimum point Q existing outside the triangle having the points U, V, and W as vertices. At the magnetic field minimum point Q, as described later, components in the same direction as the magnetic field line segment VW are weakened. The position of the magnetic field minimum point Q can be specified as follows. That is, when the point on the vertical bisector C is X, the distance r from the point U to the point X where the vertical bisector C and the central axis of the conducting wire 12u intersect, and the point V to the point X The position of the point X where the relationship of a / r = sin θ is established between the distance a and the distance a from the point W to the point X becomes the position of the magnetic field minimum point Q. Here, θ is an angle formed by the line segment VW and the line segment XV or an angle formed by the line segment VW and the line segment XW.

  In general, an induced electromotive force is induced in an electric circuit by a magnetic field generated from another electric circuit or the like. This induced electromotive force becomes noise in the electric circuit and has an adverse effect such as causing the electric circuit to malfunction. When the electric circuit is configured on the substrate, the largest induced electromotive force is generated in the electric circuit by a magnetic field having a specific direction with respect to the surface of the substrate. For example, when a loop-shaped conductor is provided on the surface of the substrate, the flux linkage with respect to the magnetic field in the direction perpendicular to the surface of the substrate is the largest for the loop-shaped conductor. Therefore, the largest induced electromotive force is induced in the loop-shaped conductor with respect to the magnetic field in the direction perpendicular to the surface of the substrate.

  Also in the measurement circuit 18 according to the present embodiment, the largest induced electromotive force is generated due to a magnetic field having a specific direction and becomes noise, as in a general electric circuit. The measurement circuit 18 is arranged so that the direction of the line segment VW coincides with the direction of the magnetic field on which the measurement circuit 18 is most adversely affected. For example, when the measurement circuit 18 is configured on the substrate 18B as shown in FIG. 2 and the adverse effect due to the magnetic field in the direction perpendicular to the surface of the substrate 18B is the largest, the measurement circuit 18 may It is arranged in a direction that matches the normal direction of the surface.

  The motor generator 14 rotates with the electric power input from the motor generator terminals 14u, 14v, and 14w to drive the vehicle, or outputs the electric power generated by the traveling of the vehicle from the motor generator terminals 14u, 14v, and 14w. .

  The current sensor 16 is provided in the vicinity of any one of the conducting wires 12u, 12v, or 12w. Here, the current sensor 16 is provided in the vicinity of the conducting wire 12u. The current sensor 16 measures the magnitude of the current flowing through the conducting wire 12u. As the current sensor 16, it is preferable to apply a Hall element or the like that generates a voltage based on a magnetic field generated near a conducting wire through which a current flows and outputs the voltage as a measurement signal M.

  The operation unit 20 includes an accelerator pedal, a brake pedal, and the like. The operation unit 20 outputs vehicle control information Ct for controlling the running state of the vehicle in accordance with a user operation.

  Next, vehicle travel control by the vehicle drive system will be described. The operation unit 20 outputs vehicle control information Ct to the control unit 22 in accordance with a user operation.

  The control unit 22 determines target power to be supplied to the motor generator 14 according to the vehicle control information Ct, and outputs an adjustment signal ADJ for outputting the determined target power from the power circuit 10 to the power circuit 10. Power circuit 10 outputs an AC voltage in accordance with adjustment signal ADJ to power circuit terminals 10u, 10v, and 10w, and supplies power to motor generator 14 via conductors 12u, 12v, and 12w.

  The current sensor 16 measures the magnitude of the current flowing through the conductive wire 12 u and outputs a measurement signal M including information on the measurement value to the measurement circuit 18.

  The measurement circuit 18 includes an amplifier circuit (not shown). The amplifier circuit amplifies the measurement signal M so that the measurement signal M has a predetermined magnitude and outputs the amplified signal to the control unit 22. If the control unit 22 is configured to acquire and process a digital signal, an A / D conversion circuit is provided at the output terminal of the amplifier circuit, and the measurement signal M is converted into a digital signal before being output to the control unit 22. What is necessary is just to be the structure to do.

  The control unit 22 obtains the power supplied to the motor generator 14 based on the measurement signal M and compares it with the target power. The control unit 22 generates an adjustment signal ADJ for reducing the difference between the power obtained based on the measurement signal M and the target power, and outputs the adjustment signal ADJ to the power circuit 10.

  The control unit 22 outputs an adjustment signal ADJ for causing the battery 10B to recover the electric power generated by the motor generator 14 to the power circuit 10 in accordance with the vehicle control information Ct and the actual running state of the vehicle. The power circuit 10 charges the battery 10B with the power acquired from the motor generator 14 via the conducting wires 12u, 12v, and 12w in accordance with the adjustment signal ADJ.

  In the vehicle drive system according to the present embodiment, the measurement circuit 18 is disposed at the position of the magnetic field minimum point Q. Magnetic fields Hu, Hv, and Hw generated by currents Iu, Iv, and Iw, respectively, at magnetic field minimum point Q are represented as vectors Hu, Hv, and Hw in FIG. 4, respectively. The same components as those in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.

  The vector Hu is represented by a tangential arrow at a magnetic field minimum point Q of a circle Cu having a radius r centered on the point U. For a current flowing through the conductor 12u in the direction from the drawing surface of FIG. 4 toward the opposite side, the vector Hu is represented by an arrow in the direction of drawing the circle Cu clockwise. The vector Hv is represented by a tangential arrow at the magnetic field minimum point Q of the circle Cv with the radius a centered at the point V. For the current flowing through the conductor 12v in the direction from the drawing surface of FIG. 4 toward the opposite side, the vector Hv is represented by an arrow in the direction of drawing the circle Cv clockwise. The vector Hw is represented by a tangential arrow at a magnetic field minimum point Q of a circle Cw having a radius a centered at the point W. For the current flowing through the conductor 12w in the direction from the drawing surface of FIG. 4 to the opposite surface, the vector Hw is represented by an arrow in the direction of drawing the circle Cw clockwise.

  If the magnitudes of the currents Iu, Iv, and Iw are I, and the phase of the current Iu is used as a reference, the magnitudes of the vectors Hu, Hv, and Hw are determined by the electromagnetic law and the complex symbol method in AC theory, respectively. Ku = I / (2πr), Kv = I / (2πa) · exp (j120 °), Kw = I / (2πa) · exp (−j120 °). Here, exp () represents an exponential function.

  The magnitude of the magnetic field in the line segment VW direction at the magnetic field minimum point Q is Hy = Ku + Kv · sin θ + Kw · sin θ = I / (2π) · (1 / r−1 / a · sin θ). Here, at the magnetic field minimum point Q, since the relationship of a / r = sin θ is established, 1 / r−1 / a · sin θ = 0 is established, and Hy = 0. That is, due to the currents Iu, Iv, and Iw, the component in the same direction as the line segment VW of the magnetic field generated at the magnetic field minimum point Q becomes zero.

  The measurement circuit 18 in the vehicle drive system is arranged at the position of the magnetic field minimum point Q, and is arranged so that the direction of the line segment VW coincides with the direction of the magnetic field on which the measurement circuit 18 is most adversely affected. According to such a configuration, it is possible to avoid an adverse effect on the measurement circuit 18 due to the magnetic field generated by the currents Iu, Iv, and Iw. Thereby, it is possible to avoid malfunction of the vehicle drive system due to noise generated in the measurement circuit 18 or the like.

  In the above description, the configuration in which the measurement circuit 18 is disposed at the position of the magnetic field minimum point Q has been described. However, a general electric circuit provided in the vehicle may be disposed at the magnetic field minimum point Q. In addition, even when a polyphase alternating current of four or more phases is applied, a configuration in which a magnetic field minimum point is specified based on the same principle as in the case of a three-phase alternating current and an electric circuit such as the measurement circuit 18 is arranged at the magnetic field minimum point It can be.

It is a figure showing composition of a vehicle drive system concerning an embodiment of the present invention. It is a perspective view of a conducting wire and a measurement circuit. It is a figure which shows a cross section perpendicular | vertical to the extending | stretching direction of conducting wire. It is a figure which shows the vector of the magnetic field in a magnetic field minimum point.

Explanation of symbols

  10 power circuit, 10B battery, 10u, 10v, 10w power circuit terminal, 14u, 14v, 14w motor generator terminal, 12u, 12v, 12w lead wire, 14 motor generator, 16 current sensor, 18 measurement circuit, 18B substrate, 20 operation unit , 22 control unit, 100 vehicle power supply system, Q magnetic field minimum point.

Claims (5)

A power circuit that transfers power to and from a motor generator that drives the vehicle;
A plurality of conductors connected to the power circuit, for transmitting power exchanged between the power circuit and the motor generator by polyphase alternating current;
An electric circuit mounted on the vehicle and provided separately from the power circuit;
A vehicle power supply system comprising:
The electrical circuit is
A power supply system for a vehicle, characterized in that it is provided at a position where magnetic fields generated by respective currents flowing through the plurality of conducting wires are mutually reduced. The vehicle power supply system according to claim 1,
A measurement unit that measures an electrophysical quantity appearing in any of the plurality of conducting wires, and outputs a signal including information of a measurement value;
A control unit for controlling the power circuit based on a measurement result of the measurement unit;
With
The electrical circuit is
A vehicle power supply system that processes a signal output from the measurement unit and outputs the processed signal to the control unit. A power circuit that transfers power to and from a motor generator that drives the vehicle;
Three conductors connected to the power circuit and transmitting power exchanged between the power circuit and the motor generator by a three-phase alternating current;
An electric circuit mounted on the vehicle and provided separately from the power circuit;
A vehicle power supply system comprising:
The three conducting wires are arranged such that a triangle having apexes at three points where a cross section perpendicular to the extending direction of the three conducting wires and the three conducting wires intersect is an isosceles triangle,
The electrical circuit is
A power supply system for a vehicle, wherein the vehicle power supply system is provided on a straight line that bisects the base of an isosceles triangle formed by the triangle. The vehicle power supply system according to claim 3,
A measurement unit that measures an electrophysical quantity appearing in any of the three conducting wires and outputs a signal including information of a measurement value;
A control unit for controlling the power circuit based on the measurement result of the measurement unit,
The electrical circuit is
A vehicle power supply system that processes a signal output from the measurement unit and outputs the processed signal to the control unit.   A vehicle comprising the vehicle power supply system according to any one of claims 1 to 4 and the motor generator.

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