JP2009135560A - Power supply line communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply line communication apparatus capable of performing power supply line communications while suppressing the affect of a noise in a power supply line as much as possible. <P>SOLUTION: The power supply line communication apparatus superimposes a modulated signal in which a high frequency signal is modulated by a signal having specific information on the power supply line for supplying the power and transmits it. The apparatus distinguishes a first power supply line for performing the power supply and transmitting the modulated signal from a second power supply line for performing only the power supply. The apparatus is provided with a filter having a high impedance with respect to the frequency band of the high frequency signal between the first and second power supply lines. The apparatus connects a grounding-side line on the load side to the grounding line of the filter from the filter so as to ground the grounding line of the filter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present application relates to a technical field such as a power line communication device that transmits a high-frequency signal obtained by modulating a signal having specific information while being superimposed on a power supply line that supplies power.

  Conventionally, in order to control various motors, relays, and the like in the vehicle, wires corresponding to the number of wires have been wired, and the number of wires has increased as the computerization has progressed in the vehicle. .

  For example, many driver wires for power window and centralized door lock control are wired in a driver's seat door of a typical medium-sized passenger car (for example, 15 or more wires are wired in the driver's seat door). However, in recent years, the number of cases where a function such as a keyless entry system that locks and unlocks a door without using a key is further increased.

  FIG. 1 is a diagram showing an example of a control circuit of a part related to a power window and centralized door lock control in a driver's seat door portion of a conventional medium-sized passenger car, and FIG. 2 (A) shows power in a passenger seat door portion of the passenger car. It is a figure which shows an example of the control circuit of the part regarding a window and centralized door lock control, FIG.2 (B) is an example of the control circuit of the part regarding the power window and centralized door lock control in the rear right seat door part of this passenger car. FIG. 2C is a diagram illustrating an example of a control circuit of a portion related to the power window and the centralized door lock control in the rear left seat door portion of the passenger car.

  In FIG. 1, 1 is a motor for a driver's seat power window that opens and closes by sliding a power window (window glass) in the driver's seat door portion up and down, and 2 and 3 are switches for controlling the driver's seat power window. .

  Here, when the switch 2 is ON (OFF state in FIG. 1), the power window moves in the closing direction, and when the switch 3 is ON (OFF state in FIG. 1), the motor 1 moves so that the power window moves in the opening direction. It is designed to rotate. Normally, the switches 2 and 3 have a function like a seesaw switch and are not turned ON at the same time.

  In FIG. 1, 4 and 5 are central door lock / unlock switches for centrally locking or unlocking doors other than the driver's seat. Have.

  Reference numerals 6 and 7, 8 and 9, and 10 and 11 are a switch for passenger seat power window control, a switch for rear right seat power window control, and a switch for rear left seat power window control, respectively. Like 2 and 3, it has a function like a seesaw switch.

  Reference numeral 12 denotes an operation prohibiting switch for prohibiting the opening / closing of the power window at the door portion other than the driver's seat and the operation of the door locking / unlocking switch, and opens the negative side circuit of the motor at each door portion. This operation is prohibited.

  Reference numerals 13 to 22 denote electric wires, reference numeral 13 denotes a power supply line connected to the accessory power supply Acc, and reference numeral 14 denotes a power supply line connected to the vehicle body but eventually connected to the negative side of the battery Batt. Further, 15 to 22 are wired to the door portion of the driver's seat, and are examples of devices provided in the motors (rear passenger seat door rear portion, right seat door portion, rear left seat door portion) from the switches 2 to 11. ) For controlling a control signal having control information to control each of the passenger seat door portion, the rear right seat door portion, and the rear left seat door portion shown in FIGS. It is connected to the signal line of the same number to be wired.

  On the other hand, in FIG. 2A, 30 is a motor for a passenger seat power window that opens and closes by sliding the power window in the passenger seat door portion up and down, and 32 and 33 are switches for controlling the passenger seat power window. is there. In FIG. 2B, reference numeral 40 denotes a motor for a rear right seat power window that opens and closes by sliding the power window in the rear right seat door portion up and down, and 42 and 43 are for controlling the rear right seat power window. Switch. In FIG. 2C, reference numeral 50 denotes a motor for a rear left seat power window that opens and closes a power window in the rear left seat door portion by sliding up and down, and 52 and 53 are for controlling the rear left seat power window. Switch. The switches 32, 33, 42, 43, 52, and 53 also have a function like a seesaw switch like the switches 2 and 3. Motors 31, 41, and 51 shown in FIGS. 2A to 2C are for locking / unlocking the doors.

  In this way, the electric wires wired in the vehicle are newly required every time a new service or function is added, and in recent years there are many such as MOST (Media Oriented Systems Transport) and LIN (Local Interconnect Network) that can be multiplexed. Digital communication BUS is adopted.

However, the number of electric wires in the vehicle increases, and the weight of the vehicle affects the fuel consumption rate. As a solution to this problem, studies have been made to reduce control wires that have been conventionally required by using a power line wired in a vehicle as a communication means. In power line communication using a power line as a communication means, a modulation signal obtained by modulating a high-frequency signal with a control signal to be transmitted is superimposed on the power line (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2004-336483

  However, since the power line communication described above uses high-frequency signals in the short wave band, when other electrical components are operated during the communication, open / close noise (noise) of motors and relays included in the electrical components ) Occurs in the communication frequency band and flows to the vehicle body and the power line as a result. Therefore, control by the communication is often impossible or smooth control cannot be performed.

  In addition, dozens of parts such as the motor and relay are used in one vehicle, and it is practically difficult to take measures to prevent noise from being emitted to the power line.

  Accordingly, the present application aims to provide a power line communication apparatus capable of performing power line communication while minimizing the influence of noise on the power line as much as possible to solve such problems.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a power line communication device for transmitting a modulation signal obtained by modulating a high frequency signal with a signal having specific information superimposed on a power supply line for supplying power. A first power line for supplying power and transmitting the modulated signal is distinguished from a second power line for supplying power only, and the high-frequency signal is provided between the first and second power lines. A filter having a high impedance with respect to the frequency band of the filter, and connecting a ground side line on the load side from the filter to a ground line of the filter, and grounding the ground line of the filter, To do.

  Hereinafter, the best embodiment of the present application will be described with reference to the drawings. In addition, embodiment described below is embodiment at the time of applying this application with respect to the control circuit of the part regarding the power window and centralized door lock control in the door part of a medium-sized passenger car.

  FIG. 3 is a diagram showing an example of a control circuit for a power window and central door lock control in the driver's seat door portion of the medium-sized passenger car according to the present embodiment, and FIG. 4 (A) is a passenger seat door of the passenger car. FIG. 4B is a diagram illustrating an example of a control circuit of a portion related to power window and centralized door lock control in the section, and FIG. 4B is a control circuit of a portion related to power window and centralized door lock control in the rear right seat door portion of the passenger car. FIG. 4C is a diagram illustrating an example of a control circuit of a portion related to the power window and the centralized door lock control in the rear left seat door portion of the passenger car.

  3 and FIGS. 4A to 4C, the same components as those in FIGS. 1 and 2A to 2C described above are denoted by the same reference numerals, and redundant description is given. Omitted.

  In the control circuit C1 shown in FIG. 3, unlike the control circuit shown in FIG. 1, the signal lines 15 to 22 as an example of the first signal line and the power lines 13 and 14 as an example of the first power line. Between the two, a transmission unit 100 as a transmission means is interposed. Also, in the control circuit C2 shown in FIG. 4A, unlike the control circuit shown in FIG. 2A, the signal lines 15 to 18 as an example of the second signal line and the power supply lines 13 and 14 are connected. A receiving unit 101 as a receiving unit is interposed therebetween. In the control circuits C3 and C4 shown in FIGS. 4B and 4C, the receiving units 102 and 103 are interposed between the signal line and the power supply line.

  The transmission unit 100 has a control signal as an example of a signal having specific information transmitted from each of the switches 4 to 11 through the signal lines 15 to 22 (control information for controlling a motor as an example of a device). Signal), a high frequency signal is modulated by the signal, and the modulated signal is superimposed on the power supply lines 13 and 14. In addition, the transmission part 100 is installed in the driver's seat door, for example.

  On the other hand, each of the receiving units 101 to 103 receives the modulated signal superimposed by the transmitting unit 100 and transmitted through the power lines 13 and 14, demodulates the modulated signal, and outputs it to the signal line (15 to 18 etc.) ( In other words, the demodulated control signal is output). For example, the receiving unit 101 is installed inside the passenger seat door, the receiving unit 102 is installed inside the rear right seat door, for example, and the receiving unit 103 is installed inside the rear left seat door, for example.

  FIG. 5 is a diagram illustrating an example of functional blocks in the transmission unit and the reception unit.

  As illustrated in FIG. 5, the transmission unit 100 and the reception units 101 to 103 each include a control unit 110, a wireless communication unit 111, and the like.

  In the transmission unit 110, the control unit 110 receives control signals from the signal lines 15 to 22 from the input unit 110a, and outputs them to the wireless communication unit 111 as transmission control data (TX Data). The wireless communication unit 111 receives transmission control data (TX Data) from the control unit 110, modulates, for example, a high-frequency signal in a radio frequency band with the transmission control data, and outputs the modulated signal. The modulation signal thus output is superimposed on the power supply line 13 via the DC blocking capacitor C.

  On the other hand, in the receiving units 101 to 103, the radio communication unit 111 receives and demodulates the modulation signal in the radio frequency band transmitted through the power lines 13 and 14 via the DC blocking capacitor C, and uses the demodulated data as a basis. Certain reception control data (RX Data) is output to the control unit 110. The control unit 110 receives the reception control data (RX Data) from the wireless communication unit 111, determines a command code for the reception control data (RX Data), and controls only the commands for each power window and centralized door lock control. Is output from the output unit 110b to the signal line (15-18, etc.). Thereby, a power window motor, a door locking / unlocking motor, other relays, and the like are driven by a relay or a semiconductor switch (not shown).

  Thus, the control circuit C1 shown in FIG. 3 and the control circuits C2 to C4 shown in FIGS. 4A to 4C are connected via the power supply lines 13 and 14. Power supply lines 13 and 14 (an example of a first power supply line) that supply and transmit the modulation signal, and a power supply line (second power supply) that performs power supply only, such as a wiper or a horn (horn). The power supply can be ignored between the first power supply line and the second power supply line, and a high impedance is shown for the frequency band of the high frequency signal (that is, another power supply path). Noise power generated from a line with only power supply is attenuated with respect to the communication transmission line. For example, a filter such as a low-pass filter LPF is provided. Note that the power line communication device of the present application includes at least the power lines 13 and 14 and the filter (or the power lines 13 and 14, the transmission unit 110, the reception units 101 to 103, and the filter).

  FIG. 6 shows an example of a circuit in which a power supply line that supplies power and transmits the modulation signal is distinguished from a power supply line that only supplies power, and a low-pass filter LPF is interposed between the power supply lines. FIG.

  In FIG. 6, the control circuits C1 to C4 are provided inside the respective doors, but the power lines 13 and 14 supplied to the respective control circuits are connected in parallel at appropriate positions in the vehicle. Further, the power lines 13 and 14 connected in parallel are low-pass filters LPF in the vicinity of the vehicle fuse box (for example, the low-pass filter LPF is installed in a part having a switchboard function such as a fuse box portion of the vehicle). The power line 13 is connected to the fuse, and is connected to the positive electrode of the battery Batt via the accessory switch ASW. Further, the power supply line 14 is body-grounded (GND) at an appropriate position, and is consequently connected to the negative electrode of the battery Batt.

  When the low-pass filter LPF is not present, for example, when a not-shown wiper or horn (horn) is operated, a strong short-wave noise signal is superimposed on the power line, and the power line communication is cut off due to the interference. However, if the low pass filter LPF is interposed as in the circuit shown in FIG. 6, the power lines 61 and 62 of the wiper and other motors pass through the low pass near the fuse box. The filter LPF can be separated in a high-frequency manner, and high-frequency noise therefrom can be structured not to flow into the power line 13 that performs power line communication.

  However, since negative power supply lines such as a wiper and a horn (not shown) are grounded to nearby vehicle bodies, a noise current related to the noise signal flows toward the negative electrode of the battery Batt. Therefore, as in the circuit shown in FIG. 6, when the ground line of the low-pass filter LPF inserted in the power line and the power line 14 are grounded to the vehicle body at arbitrary positions, the noise current flowing in the vehicle body However, this occurs as a potential difference due to the impedance of the vehicle body between the power line 14 and the ground line of the low-pass filter LPF, which significantly impedes the noise frequency component reduction effect of the low-pass filter LPF.

  Therefore, in order to solve the influence of such noise, as shown in FIG. 7, the ground-side line on the load side is connected from the low-pass filter LPF to the ground line of the low-pass filter LPF, and the low-pass filter LPF is connected. The ground line of the pass filter LPF is grounded at an arbitrary place of the vehicle. That is, the power supply line 14 is body-grounded (GND) at an appropriate position via the ground-side line of the low-pass filter LPF, and is eventually connected to the negative electrode of the battery Batt through the vehicle body.

  As a result, the power supply line 14, which is the ground side line of the circuit controlled by performing power line communication, is connected to the ground side circuit of the low-pass filter LPF and is then body-grounded (GND) at an appropriate position. Therefore, noise interference does not occur in a circuit that is controlled for communication.

  As in FIG. 6, the power line 13 is connected to a fuse and connected to the positive electrode of the battery Batt via the accessory switch ASW.

  As described above, according to the embodiment, the power lines 13 and 14 that transmit the modulation signal are distinguished from the power lines 51 and the like that operate only a power supply such as a wiper or a horn (horn). In addition, a low-pass filter LPF having a high impedance is provided between the power supply lines for the frequency band of the high-frequency signal, and the load-side ground-side line is further lowered from the low-pass filter LPF to the low-pass filter LPF. Since it is connected to the ground line of the low-pass filter LPF and the ground line of the low-pass filter LPF is grounded to an arbitrary place of the vehicle, power line communication can be performed while suppressing the influence of noise on the power line as much as possible. Therefore, it is possible to prevent noise interference from occurring in a circuit that is again subjected to communication control by a noise current flowing through the vehicle body.

  In the above embodiment, the power line communication target is a control signal for controlling a device such as a motor provided in the vehicle, so that the control wire can be further reduced in a vehicle. Can increase the effect.

  Even with the configuration as in the above embodiment, it is difficult to eliminate the influence of noise generated in the communication line such as the power window motor and the central door lock motor, but the noise generation source in the communication is Since it can be specified and there are a small number of parts, individual correspondence is easy.

Therefore, it is sufficient to cope with noise interference of controlled devices (motors, relays, etc.) only in the power line communication line, not only the countermeasures are simplified, but also the number of components required is minimized, resulting in the vehicle It helps to reduce weight and improve fuel consumption, and can contribute to CO ₂ reduction.

  FIG. 8 is a diagram illustrating a circuit example when the power used in the power line communication is large and the fuse needs to be separated. In FIG. 8, the power lines for performing power line communication are further classified into a plurality of lines, and a fuse is provided (intervened) between the plurality of lines, and a low-pass filter is commonly provided on the power supply side of the fuse box. An LPF is inserted, and the ground-side line on the load side from the low-pass filter LPF is connected to the ground line of the low-pass filter LPF, and the ground line of the low-pass filter LPF is grounded at an arbitrary place of the vehicle Has been.

  According to this configuration, it is possible to prevent the occurrence of noise interference in the circuit that has been communication-controlled again due to the noise current flowing in the vehicle body, and further, by increasing the number of fuses as necessary, the total power consumption can be reduced. Can be bigger.

  As the low-pass filter LPF shown in FIGS. 7 and 8, the circuit shown in FIG. 9 is typical and practical, but other circuit methods may be used as necessary. For example, as another circuit example, as shown in FIG. 10, a π-type circuit or a parallel resonant circuit may be combined. Note that the low-pass filter LPF used in the present application is characterized by including a circuit having a portion that is short-circuited with respect to a high frequency in the circuit (in other words, a capacitor portion in FIG. 9), so that the supplied power is short-circuited. A simple circuit cannot be used.

  Moreover, in the said embodiment, although the example at the time of applying this application with respect to the control circuit of the part regarding the power window and centralized door lock control in the door part of a medium-sized passenger car was demonstrated, it is not limited to this, The present invention can also be applied to other control circuits in a vehicle. Further, the present application is applicable not only to a control circuit in a medium-sized passenger car but also to a control circuit in a vehicle such as a bus and a truck, a train running on a track, and the like.

  In the above-described embodiment, the case where the present invention is applied to a control signal having control information for controlling a device provided in the vehicle has been described as an example of a signal having specific information. For example, the present invention can also be applied to a signal (video data, audio data, text data, or the like) having audio information, video information, character information, or the like.

It is a figure which shows an example of the control circuit of the part regarding the power window and concentrated door lock control in the driver's seat door part of the conventional medium-sized passenger car. (A) is a figure which shows an example of the control circuit of the part regarding the power window and concentrated door lock control in the passenger seat door part of this passenger car, (B) is the power window in the rear right seat door part of this passenger car It is a figure which shows an example of the control circuit of the part regarding centralized door lock control, (C) is a figure which shows an example of the control circuit of the part regarding the power window and centralized door lock control in the rear left seat door part of this passenger car. . It is a figure which shows an example of the control circuit of the part regarding the power window and concentrated door lock control in the driver's seat door part of the medium-sized passenger car which concerns on this embodiment. (A) is a figure which shows an example of the control circuit of the part regarding the power window and concentrated door lock control in the passenger seat door part of this passenger car, (B) is the power window in the rear right seat door part of this passenger car It is a figure which shows an example of the control circuit of the part regarding centralized door lock control, (C) is a figure which shows an example of the control circuit of the part regarding the power window and centralized door lock control in the rear left seat door part of this passenger car. . It is a figure which shows the example of a functional block in a transmission part and a receiving part. The figure which shows the example of a circuit which distinguished the power supply line which transmits the said modulation signal while supplying electric power, and the power supply line which only supplies electric power, and interposed the low-pass (low-pass) filter LPF between both power supply lines. is there. The figure which shows the example of a circuit by which the ground side line | wire by the side of a load is connected to the ground line of the low-pass filter LPF from the low-pass filter LPF, and the ground line of the said low-pass filter LPF is earth | grounded in the arbitrary places of the vehicle It is. It is a figure which shows the example of a circuit when the electric power used of the line | wire which performs power line communication is large, and it becomes necessary to isolate | separate a fuse. It is a figure which shows the circuit example of the low-pass filter LPF. It is a figure which shows the other example of the circuit of the low-pass filter LPF.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor for driver's seat power window 2,3 Switch for driver seat power window control 4,5 Switch for centralized door lock / unlock 6, 7, 32, 33 Switch for passenger seat power window control 8, 9, 42, 43 Rear right seat power window control switch 10, 11, 52, 53 Rear left seat power window control switch 12 Operation prohibition switch 13, 14 Power line
15-22 Signal line 30 Motor for passenger seat power window 40 Motor for rear right seat power window 50 Motor for rear left seat power window 31 Motor for locking / unlocking passenger door 41 Locking rear right seat door / Locking motor 51 Rear left seat door locking / unlocking motor 100 Transmitter 101, 102, 103 Receiving unit 110 Control unit 111 Wireless communication unit LPF Low-pass filter ASW Accessory switch Batt Battery

Claims (5)

A power line communication device that transmits a modulation signal obtained by modulating a high frequency signal with a signal having specific information superimposed on a power supply line for supplying power,
A first power supply line that supplies power and transmits the modulated signal is distinguished from a second power supply line that only supplies power, and the frequency band of the high-frequency signal is between the first and second power supply lines. With a high impedance filter,
A power line communication device, wherein a ground side line on a load side from the filter is connected to a ground line of the filter, and the ground line of the filter is grounded. In the power line communication device according to claim 1,
A transmission means for inputting a signal having the specific information from a first signal line, modulating the high-frequency signal by the signal, and superimposing the modulation signal on the power line;
Receiving means for receiving the modulated signal superimposed by the transmitting means and transmitted through the power line, demodulating the modulated signal and outputting it to the second signal line;
A power line communication device comprising: In the power line communication device according to claim 1 or 2,
The first power line is further classified into a plurality of lines, and a fuse is provided between the plurality of lines. In the power line communication device according to any one of claims 1 to 3,
The power line communication device is installed in a vehicle,
The power line communication device according to claim 1, wherein the ground line of the filter is grounded at an arbitrary place of the vehicle. In the power line communication device according to claim 4,
The power line communication apparatus according to claim 1, wherein the specific information is control information for controlling a device provided in the vehicle.

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