JP2007027041A - Cable with connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cable with a connector from easily adversely affecting an FM broadcast, in relation to a cable with a connector for composing a local area network by using an electronic control device and a plurality of communication terminals. <P>SOLUTION: An actuator system is provided with the communication terminals 20, 21 and 22 driving servo motors 10, 11 and 12, respectively, and the electronic control device 30. The electronic control device 30 constitutes an in-vehicle LAN by being connected in a bus type by a communication cable 40 in cooperation with the communication terminals 20, 21 and 22. The connectors 50, 51 and 52 are arranged for respectively connecting the communication terminals 20, 21 and 22 to the communication cable 40. The length L1 of the communication cable 40 between the connectors 50 and 51, the length L2 of the communication cable 40 between the connectors 51 and 52 and the length L1+L2 of the communication cable 40 between the connectors 51 and 52 are so set as to prevent generation of resonance at the same frequency as that of airwaves of an FM broadcast. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cable with a connector for constituting a local area network by an electronic control device and a plurality of communication terminals.

  Conventionally, in an actuator system for a vehicle air conditioner, as shown in FIG. 1, servo motors 10, 11, and 12 that drive each door of an indoor air conditioning unit, and communications that drive the servo motors 10, 11, and 12 respectively. A device including terminals 20, 21, 22 and an electronic control device 30 has been proposed (see, for example, Patent Document 1).

  In this device, communication terminals 20, 21, and 22 are connected to the communication cable 40 in a bus shape by connectors 50, 51, and 52. As a result, the communication terminals 20, 21, 22 and the electronic control device 30 constitute a local area network.

Since the communication terminals 20, 21, and 22 control the servo motors 10, 11, and 12 based on commands from the electronic control unit 30, the servo motors 10, 11, and 12 drive each door to the target position. can do.
JP 2005-5148 A

  In the actuator system described above, when the electronic control unit 30 communicates with the communication terminals 20, 21, and 22, resonance may occur due to noise. In particular, when resonance occurs at the same frequency as the broadcast frequency of radio, television, etc., electromagnetic noise is generated along with this resonance, which adversely affects FM broadcasting.

  An object of this invention is to provide the cable with a connector which made it difficult to have a bad influence on FM broadcast, when an electronic controller communicates with a communication terminal in view of the said point.

In the present invention, the length dimension of the transmission line of any two of the plurality of communication terminals is {c / (f · 2 ⁿ · k)} (c: speed of light, f: frequency, n: integer, k: an odd number), the transmission line of the two communication terminals functions as an antenna and resonates easily at the frequency f.

  Specifically, the present invention relates to the plurality of connectors so as to avoid resonance in the frequency band of FM broadcasting based on the length dimension of the transmission line between any two of the plurality of communication terminals. Are arranged respectively.

  Therefore, when the electronic control unit communicates with the communication terminal, it is possible to make it difficult to resonate in the frequency band of the broadcast radio wave, so that generation of electromagnetic noise in the frequency band of the FM broadcast can be suppressed, and the FM broadcast is adversely affected. It can be difficult to give. The transmission line is a path through which a communication signal propagates between the electronic control device and the communication terminal.

  FIG. 1 shows a configuration of an actuator system for a vehicle air conditioner to which a cable with a connector according to the present invention is applied. It should be noted that the same parts as those in the above-described conventional technology are denoted by the same reference numerals to simplify the description.

  As shown in FIG. 1, the actuator system includes servo motors 10, 11, 12, communication terminals 20, 21, 22 that drive the servo motors 10, 11, 12, an electronic control device 30, and connectors 50, 51. , 52.

  The electronic control device 30 is connected to the communication cable 40 and constitutes a local area network together with the communication terminals 20, 21, and 22. The electronic control unit 30 calculates a target blown air temperature TAO to be blown out from the blowout port of the indoor air conditioning unit based on the air temperature in the vehicle interior, the solar radiation intensity, the set temperature, etc., and the servo motor based on the target blown air temperature TAO. The target angles 10, 11, and 12 are calculated and transmitted to the communication terminals 20, 21, and 22.

  Here, the servo motors 10, 11, and 12 are electric motors 10a, 11a, and 12a that respectively rotate and drive the doors of the indoor air conditioning unit, and angle sensors 10b and 11b that detect rotation angles of the electric motors 10a, 11a, and 12a. , 12b and each.

  The communication terminals 20, 21, and 22 control the electric motors 10a, 11a, and 12a so that the rotation angle approaches the target angle based on the detection values of the angle sensors 10b, 11b, and 12b, respectively.

  The connectors 50, 51, 52 are provided for connecting the communication terminals 20, 21, 22 to the communication cable 40 in a bus form. Here, since the connectors 50, 51, and 52 have the same structure, the structure of the connector 50 will be described with reference to FIGS. 2 is a perspective view showing the structure of the connector 50, FIG. 3 is a side view showing the structure of the connector 50 with the cover removed, and FIG. 4 is a perspective view showing the structure of the connector 50 with the cover fitted. FIG.

  As shown in FIG. 2, the connector 50 includes a housing 500, and a circuit board 502 and an integrated circuit 503 are accommodated in an opening 501 of the housing 500. The housing 500 is provided with a lid portion 501a for closing the opening 501. The circuit board 502 and the integrated circuit 503 constitute the communication terminal 20.

  Three terminals 504 are accommodated in the housing 500, and one end 504a of each terminal 504 is in contact with the electrode portion of the circuit board 502, as shown in FIG. The other end portion 504b of each terminal 504 is formed in a V-shape and contacts the core wire in each insulation coating in a state where the other end portion 504b bites into the power line 40a, the communication line 40b, and the ground line 40c constituting the communication cable 40. .

  Here, as shown in FIG. 4, the cover 506 is connected to the power supply line 40 a, the communication line 40 b, and the ground line 40 c of the communication cable 40 in the state in which the projection 507 of the housing 500 is fitted. It is sandwiched between 504b.

  Further, as shown in FIG. 2, the housing 500 accommodates three terminals 505, and one end portion 505a of each terminal 505 is in contact with the electrode portion of the circuit board 502 as shown in FIG. ing. The housing 500 is provided with an opening 508 into which the male connector 10c of the servo motor 10 shown in FIG. FIG. 5 is a diagram showing the structure of the servo motor 10.

  And the other end part 505b of each terminal 505 shown in FIG. 3 contacts with each electrode part 10d of the male connector 10c in a state where the male connector 10c is inserted into the opening 508 of the housing 500.

  The connectors 50, 51, 52 configured in this way are arranged so as to avoid resonance in the frequency band of broadcast radio waves based on the length of the transmission line between the two communication terminals. The two communication terminals are any two of the communication terminals 20, 21, and 22.

  Here, the transmission line between the two communication terminals includes the terminal 504 in addition to the communication cable 40, but the length dimension of the terminal 504 is extremely small compared to the communication cable 40, so in this embodiment. When calculating the length dimension of the transmission line, the length dimension of the terminal 504 is omitted and only the communication cable 40 is used. Hereinafter, calculation of a specific length dimension of a transmission line between two communication terminals will be described.

  In the present embodiment, as shown in FIG. 6, the length dimension of the communication cable 40 between the connectors 50 and 51 is L1, the length dimension of the communication cable 40 between the connectors 51 and 52 is L2, and the connector 50 , 52, the length dimension of the communication cable 40 is L1 + L2. Then, L1, L2, and L1 + L2 are set as follows so as to avoid resonating at the same frequency as the FM radio wave.

Assume that the frequency of radio waves of FM broadcasting is f1 to f2, n is an integer, k is an odd number, and c is the speed of light. Here, when any one of L1, L2, and L1 + L2 is within a range represented by {c / (f1 · 2 ⁿ · k)} to {c / (f2 · 2 ⁿ · k)}, L1, One of L2 and L1 + L2 has an odd multiple of 1/2 wavelength length of FM broadcast, and resonance occurs when the electronic control unit 30 communicates with any of the communication terminals 20, 21, and 22. There is a high possibility of doing.

Therefore, in this embodiment, L1, L2, and L1 + L2 are removed from {c / (f1 · 2 ⁿ · k)} to {c / ( f2 · 2 ⁿ · k)}. Specifically, the frequency band of FM broadcast radio waves is 76 Mhz to 89.9 Mhz, and n = 1, 2, 3, 4, k = 1, 3, 5, 7, 9.

Then, {c / (f1 · 2 ⁿ · k)} to {c / (f2 · 2 ⁿ · k)} are 1.973684 to 1.668521, 0657895 to 0556174,. (Omitted)..., 0246711 to 0.208565. L1, L2, and L1 + L2 are set within one of the ranges excluding these ranges, that is, 0.1 m to 0.5 m, 0.55 m to 0.66 m, 0.8 m to 1 m, and 1.6 m to 2 m. .

  For example, assuming that L1 = 0.85m, L2 = 0.85m, and L1 + L2 = 1.7m, when the electronic control unit 30 communicates with any of the communication terminals 20, 21, and 22, the same frequency as the FM broadcast wave Therefore, it is possible to avoid the generation of electromagnetic wave noise in the frequency band of the broadcast radio wave, and it is possible to prevent the FM broadcast from being adversely affected.

(Other embodiments)
In the above-described embodiment, the example in which the communication terminals 20 to 22 are accommodated in the connectors 50, 51, 52 has been described. The communication terminals 20 to 22 may be arranged outside (for example, in the servo motors 4a, 9a, and 13a).

  In this case, when calculating “the length of the transmission line between the two communication terminals”, in addition to the communication cable between the two connectors, a communication cable and a terminal for connecting the connector and the communication terminal It is necessary to consider.

It is a block diagram which shows the structure of an actuator system. It is a perspective view which shows the structure of the connector which concerns on one Embodiment of this invention. It is a side view which shows the structure of the connector which concerns on the said embodiment. It is a perspective view which shows the structure of the connector which concerns on the said embodiment. It is a figure which shows the servomotor which concerns on the said embodiment. It is a perspective view which shows the connection state of the connector which concerns on the said embodiment, and a communication cable. It is a graph which shows the dimension of the communication cable between the connectors which concerns on the said embodiment.

Explanation of symbols

10, 11, 12 ... Servo motor, 20, 21, 22 ... Communication terminal,
30 ... an electronic control unit, 40 ... a communication cable, 50, 51, 52 ... a connector.

Claims (2)

A communication cable for connecting to the electronic control device and connecting the plurality of communication terminals in a bus type to form a local area network by the electronic control device and the plurality of communication terminals;
A plurality of connectors for connecting between the communication cable and each of the plurality of communication terminals,
The plurality of connectors are respectively arranged so as to avoid resonance in the frequency band of FM broadcasting based on the length dimension of the transmission line between any two of the plurality of communication terminals. Cable with connector characterized by The plurality of communication terminals are respectively built in the plurality of connectors,
The length dimension of a transmission line between two communication terminals among the plurality of communication terminals is equivalent to the length dimension of a communication cable between two corresponding connectors among the plurality of connectors. The length of the communication cable between the two connectors is set within any one of 0.1 m to 0.5 m, 0.55 m to 0.66 m, 0.8 m to 1 m, and 1.6 m to 2 m. The cable with a connector according to claim 1, wherein the cable is a connector.

Images