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In-vehicle device and communication method

A vehicle-mounted device and communication method technology, which is applied to measuring devices, vehicle components, transportation and packaging, etc., can solve problems such as insensitivity and level drop, and achieve the effect of suppressing insensitivity areas and shortening processing time

Inactive Publication Date: 2010-09-15
OMRON AUTOMOTIVE ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this time, there is a problem of a "dead zone" due to the collision of signals transmitted from the multiple in-vehicle antennas 3-1, 3-2.
That is, if Figure 9 As shown in , the magnetic fields from the antennas 3-1 and 3-2 for the interior of the vehicle interfere with each other, so that the level drops

Method used

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  • In-vehicle device and communication method

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Embodiment Construction

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] A. Structure of Embodiments

[0032] figure 1 It is a block diagram showing the configuration of a keyless entry system and an in-vehicle device according to an embodiment of the present invention. In the figure, an in-vehicle device 10 has a control unit 11, a phase control unit 12, transmission and reception units 13-1, 13-2, and in-vehicle antennas 14-1, 14-2. In addition, the terminal device 2 is the same as the prior art, so the description is omitted.

[0033] The control unit 11 controls the operations of each unit for data transmission and reception, and upon receiving a response signal from a specific portable machine 2, opens and closes the doors of the vehicle, starts / stops the engine, etc., according to the position of the portable machine 2. scheduled control. The phase control unit 12 controls the phase difference at the transmission and recept...

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Abstract

The present invention provides an in-vehicle device and a communication method, capable of restraining dead zones and shortening processing time. A control part (11) controls action of each part according to data transmitting and receiving. A phase control part (12) controls a phase difference of transceiving parts (13-1, 13-2) according to a control signal (S1) of the control part (11). When the transceiving parts (13-1, 13-2) modulate transmitting data (LF signal; response request signal) from the control part (11) respectively, the data is transmitted by corresponding in-vehicle antennas (14-1, 14-2) based on the control of the phase control part (12) with an additional phase difference of Pi / n (n is equal to a number of antennas).

Description

technical field [0001] The present invention relates to a vehicle-mounted device and a communication method. Background technique [0002] Conventionally, a so-called Passive Entry System (Passive Entry System) that performs predetermined control such as opening and closing doors of a car or the like or starting / stopping an engine automatically without inserting a key has been put into practical use. In the previous keyless entry system, such as Figure 6 As shown, in the case of communicating with the portable device 2 inside the vehicle 1, a request is sent to the portable device 2 via the in-vehicle (IF: Low Frequency) antenna 3 of the vehicle-mounted device (not shown). As for the response signal, when the response signal is normally received on the portable machine 2 side, it responds by UHF (Ultra High Frequency: Ultra High Frequency). [0003] At this time, in order to prevent forgetting where the portable device 2 is placed, etc., it is necessary to correctly determ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E05B49/00H04B7/04G08C17/02B60R25/01B60R25/10B60R25/24G01S7/282G01S13/74
CPCG07C2209/63G08C19/12G07C9/00309B60R25/245G07C2009/00793B60R25/2072H04B7/0617
Inventor 田中章友
Owner OMRON AUTOMOTIVE ELECTRONICS CO LTD