Electric power line communication system for vehicle

A technology of power line communication and power line, which is applied in the direction of distribution line transmission system, vehicle components, circuits or fluid pipelines, and can solve problems such as complex structures

Inactive Publication Date: 2012-03-21
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the system has a complex structure

Method used

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  • Electric power line communication system for vehicle
  • Electric power line communication system for vehicle
  • Electric power line communication system for vehicle

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0015] Figure 1A A power line communication system mounted on a vehicle is shown. A battery 1 as a power source having a positive electrode for supplying a voltage of 12 volts is connected to a +B line 2 as a power line. Further, battery 1 is connected to IG (ie, ignition) line 6 and ACC (auxiliary) line 7 via IG relay 4 and ACC relay 5 . Here, the IG relay 4 and the ACC relay 5 provide a key switch. IG relay 4 and ACC relay 5 according to the Figure 1B The position of the lock cylinder 3 shown in to switch on and off. The negative electrode of the battery 1 is connected to the vehicle body as a ground.

[0016] Communication devices 8 and 9 as in-vehicle devices are connected to the +B line 2 and the IG line 6 . Here, although the system includes two devices, the system may include one or more devices, such as including three communication devices. The +B line 2 and the IG line 6 provide a power line pair as a communication line pair in order to perform power line comm...

no. 2 example

[0028] Figure 4 A power line communication system mounted on a vehicle according to the second embodiment is shown. Figure 4 corresponds to Figure 1A . Communication devices 10 and 11 instead of devices 8 and 9 communicate with each other via +B line 2 and ACC line 7 . Therefore, one of the communication lines is not the IG line 6 but the ACC line 7 . Specifically, when the position of the lock cylinder 3 is at one of the ACC position, the ON position and the START position, the potential of the ACC line 7 is 12 volts. Therefore, when the potential of the ACC line 7 is 12 volts, each control circuit 10a, 11a of the communication devices 10 and 11 determines that the position of the lock cylinder 3 is at one of the ACC position, the ON position and the START position. When the potential of the ACC line 7 is 0 volts, the control circuits 10a, 11a of the communication devices 10, 11 determine that the position of the lock cylinder 3 is at the OFF position. Therefore, effec...

no. 3 example

[0030] Figure 5 and Figure 6 A power line communication system mounted on a vehicle according to the third embodiment is shown. Figure 5 corresponds to Figure 4 . Communication devices 12 and 13 instead of devices 10 and 11 communicate with each other via IG line 6 and ACC line 7 . Therefore, one of the communication lines is not the +B line 2 but the IG line 6 . Therefore, when one of the IGF relay 4 and the ACC relay 5 is turned on, the communication device 12, 13 is powered so that the device 12, 13 starts to operate.

[0031] Figure 6 A flowchart of the process performed by the control circuit 12a of the communication device 12 is shown. When one of the IG relay 4 and the ACC relay 5 is turned on, the device 12 starts to perform Figure 6 in the process. In steps S11 and S12, the control circuit 12a determines whether the voltage of the ACC line 7 and the voltage of the IG line 6 are 12 volts or 0 volts, respectively. When the voltages of both the ACC line 7 ...

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Abstract

An in-vehicle electric power line communication system includes: a pair of direct current electric power lines (2,6,7) functioning as electrically equilibrated communication lines (2,6,7); multiple communication devices (8-13) communicating with each other via the communication lines; and an ignition switch (3). Each communication device applies a high frequency signal to the communication lines so that equilibrium communication is performed. One communication line starts and stops supplying direct current electricity according to a status of the ignition switch. Each communication device detects an electric potential of the one communication line or a potential difference between the direct current electric power lines. Each communication device determines the operation status of the vehicle based on the electric potential or the potential difference. Each communication device performs the equilibrium communication according to the operation status of the vehicle.

Description

technical field [0001] The present invention relates to a power line communication system for a vehicle in which a plurality of communication devices communicate with each other via a power line. Background technique [0002] In vehicles, a power line communication system (power line communication system, ie, PLC system) for vehicles has been developed. In such a system, a plurality of devices such as ECUs (ie, Electronic Control Units) located at various locations of the vehicle communicate with each other via power lines connected to an on-vehicle battery. In particular, high frequency signals are superimposed on the normal power supplied in the power line. JP-A-2008-244701 corresponding to US 2010 / 0111201 discloses such a power line communication system. [0003] However, in such a system, it may be considered that each communication device determines a vehicle condition such as a condition of whether the vehicle's engine is running, and then the device decides to opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R16/02H04B3/54
CPCG07C9/00182G07C2009/00634G07C2209/62G07C2209/63
Inventor 安部泰司杉本勇次高桥辉
Owner DENSO CORP
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