CN203786290U

CN203786290U - A key positioner based on four antennas

Info

Publication number: CN203786290U
Application number: CN201320832709.9U
Authority: CN
Inventors: 邓明恺; 张凯
Original assignee: Delphi Electronics Suzhou Co Ltd
Current assignee: Annex Electronics (Suzhou) Co., Ltd.
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2014-08-20
Anticipated expiration: 2023-12-17

Abstract

The utility model relates to a key positioner based on four antennas; the key positioner comprises four antennas and a controller; the four antennas are respectively in wireless connection with the key; the key is in wireless connection with the controller; the four antennas are respectively a front antenna, a reserve case antenna, a left antenna and a right antenna; compared with the prior art, the key positioner is low in cost, convenient in installation, and low in power consumption.

Description

A kind of key positioner device based on four antennas

Technical field

The utility model relates to a kind of key positioner device, especially relates to a kind of key positioner device based on four antennas.

Background technology

Intelligence enters startup system (PEPS) without key and is widely used in automotive field.Wherein how the position of correct judgement Intelligent key is one of PEPS system difficult problem to be solved.

Generally, 6 of PEPS system needs or more antenna judge the position of Intelligent key, this mechanism has not only increased the cost of whole system, and host side need to support the low frequency of at least 6 antennas to send when carrying out key position judgement, Intelligent key also needs to receive the low-frequency data of 6 antennas simultaneously, and measure the low frequency field intensity of at least 6 times, this has just strengthened the kwh loss of host side and Intelligent key end simultaneously.

Utility model content

The purpose of this utility model is exactly in order to overcome the defect that above-mentioned prior art exists, to provide that a kind of cost is low, easy for installation, the key positioner device based on four antennas of low energy consumption.

The purpose of this utility model can be achieved through the following technical solutions:

A key positioner device based on four antennas, is characterized in that, comprises four antennas and controller, four described antennas respectively with key wireless connections, described key and controller wireless connections.

Four described antennas are respectively front antenna, boot antenna, left antenna and right antenna.

The installation site of four described antennas is respectively: described front antenna is located on the axis of vehicle body of gear position, described boot antenna is located on the axis of vehicle body of back seat rear side, and described left antenna and right antenna are located at B post position about the axis symmetry of vehicle body.

More than the distance of each antenna and vehicle body metallic magnetism is greater than 2cm.

Compared with prior art, the utlity model has following advantage:

1, used antenna still less, thereby provided cost savings;

2, common six antenna PEPS systems can be installed on antenna in door handle, and door handle space is less, thereby strengthened the difficulty of design and installation, and the utility model is installed on antenna in the relatively large both sides B post in space, it is more calm and convenient to make to install and design;

3, in looking for the process of key at every turn, only use a wherein antenna and sent related data and low frequency field intensity, and other three antennas only send low frequency field intensity, Intelligent key only need receive low-frequency data one time simultaneously, measure 4 infra-low frequency field intensity, comparatively speaking, save the electric quantity consumption of main frame and key end simultaneously.

Accompanying drawing explanation

Fig. 1 is the utility model antenna arrangement figure;

Fig. 2 is that schematic diagram is defined in the interior effective coverage of the utility model car and effective coverage, the left and right sides;

Fig. 3 is that schematic diagram is defined in the utility model boot effective coverage.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.

Embodiment

As shown in Figure 1, a kind of key positioner device based on four antennas, comprises four antennas and controller, four described antennas respectively with key wireless connections, described key and controller wireless connections.Four described antennas are respectively front antenna 1, boot antenna 2, left antenna 3 and right antenna 4.

Front antenna 1, boot antenna 2, left antenna 3 and right antenna 4 are installed onboard, described front antenna 1 is located on the axis of vehicle body of gear position, described boot antenna 2 is located on the axis of vehicle body of back seat rear side, and described left antenna 3 and right antenna 4 are located at B post position about the axis symmetry of vehicle body;

The signal intensity of the front antenna 1 that controller collection is measured by Intelligent key, boot antenna 2, left antenna 3 and right antenna 4, determines the position of key according to Rule of judgment,

The received signal strength indicator (RSSI) of four antennas that the position judgment of key mainly measures based on Intelligent key carries out.

As shown in Figure 2, wherein in figure shown in the illustrated in table I of part symbol:

Table 1

Symbol	Meaning
		RSSI_Left_A	The RSSI value of the left antenna that key measures at place, thick single-point setting-out zone boundary
RSSI_Right_A	The RSSI value of the right antenna that key measures at place, thick two-dot chain line zone boundary
		RSSI_Front_A	The RSSI value of the front antenna that key measures at place, heavy line zone boundary

RSSI_Trunk_A

The RSSI value of the boot antenna that key measures at place, thick dashed line zone boundary

As shown in Figure 3, wherein in figure shown in the illustrated in table 2 of part symbol:

Table 2

Symbol	Meaning
		RSSI_Left_B	The RSSI value of the left antenna that key measures at place, thin single-point setting-out zone boundary
RSSI_Right_B	The RSSI value of the right antenna that key measures at place, thin two-dot chain line zone boundary
		RSSI_Trunk_B	The RSSI value of the boot antenna that key measures at place, fine dotted line zone boundary

As shown in accompanying drawing 2 and accompanying drawing 3, under the condition of known " the RSSI value that Intelligent key records close to more from the distance of tested antenna is larger ", can obtain Intelligent key position judgment mechanism and be:

If 1 Intelligent key measures the RSSI value of four antennas and meets following four conditions and can judge that key is positioned at vehicle body left side outside (as shown in Figure 2) simultaneously:

(1) the RSSI value of the left antenna recording is greater than RSSI_Left_A;

(2) and the RSSI value of the right antenna recording be less than RSSI_Right_A;

(3) and the RSSI value of the front antenna recording be less than RSSI_Front_A;

(4) and the RSSI value of the boot antenna recording be less than RSSI_Trunk_A.

2, in like manner, if Intelligent key measures the RSSI value of four antennas, meet following four conditions simultaneously and can judge that key is positioned at vehicle body the right outside (as shown in Figure 2):

(1) the RSSI value of the right antenna recording is greater than RSSI_Right_A;

(2) and the RSSI value of the left antenna recording be less than RSSI_Left_A;

(4) and the RSSI value of the boot antenna recording be less than RSSI_Trunk_A.

If 3 Intelligent key measure the RSSI value of four antennas and meet following four conditions and can judge that key is positioned at tail of the body outside (as shown in Figure 3) simultaneously:

(1) the RSSI value of the boot antenna recording is greater than RSSI_Trunk_B;

(2) and the RSSI value of the boot antenna recording be less than RSSI_Trunk_A;

(3) and the RSSI value of the left antenna recording be less than RSSI_Left_B;

(4) and the RSSI value of the right antenna recording be less than RSSI_Right_B.

If measuring the key of can judging first that the RSSI value of four antennas meets following three conditions, 4 Intelligent key are positioned at interior of body (as shown in Figure 2):

(1) the RSSI value of the front antenna recording is greater than RSSI_Front_A;

Or the RSSI value of the left antenna recording is greater than RSSI_Left_A and the RSSI value of the right antenna that records is greater than RSSI_Right_A (2);

(3) or the RSSI value of the boot antenna recording be greater than RSSI_Trunk_A.

Above-mentioned expression can represent by table 3 image equally:

Table 3

In table 3, the implication of part symbol is as shown in table 4:

Table 4

Claims

1. the key positioner device based on four antennas, is characterized in that, comprises four antennas and controller, four described antennas respectively with key wireless connections, described key and controller wireless connections;

Four described antennas are respectively front antenna, boot antenna, left antenna and right antenna;

2. the key positioner device based on four antennas according to claim 1, is characterized in that, more than the distance of each antenna and vehicle body metallic magnetism is greater than 2cm.