# US 2017/0282858 A1 · Keyless Entry Systems

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- Number: US 2017/0282858 A1
- Document ID: US20170282858A1
- Status: Published application
- Kind: A1
- Application number: 15/510,702
- Filed: 2015-09-07
- Published: 2017-10-05
- Earliest claimed: 2014-09-11
- Assignees: Continental Automotive GmbH
- Applicants: Continental Automotive GmbH
- Inventors: Dieter Sass
- Web page: https://patentgrep.com/patent/US20170282858A1

## CPC

- B60R 25/24: using electronic identifiers containing a code not memorised by the user
- E05B 81/77: {comprising sensors detecting the presence of the hand of a user}
- G07C 9/00309: {operated with bidirectional data transmission between data carrier and locks}
- H01Q 1/3241: {particular used in keyless entry systems}
- H01Q 1/3283: {side-mounted antennas, e.g. bumper-mounted, door-mounted (mounted on windscreens H01Q1/1271)}
- B60R 2325/103: Near field communication [NFC]
- G07C 2009/00365: {in combination with a wake-up circuit}
- G07C 2009/00404: {starting with prompting the lock}
- G07C 2209/63: Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- G07C: TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

The present disclosure relates to an arrangement and a method for detecting the approach of an object and the teachings thereof may be embodied in a system for providing passive keyless vehicle access. A device may include: a communication device with an antenna to generate an electromagnetic field at regular intervals in a polling mode; and a processor to determine at least one operating parameter of the antenna whenever an electromagnetic field is generated, to compare the at least one determined operating parameter with a corresponding previously determined operating parameter, wherein a change in the at least one operating parameter indicates that an object is approaching the device, and to emit a signal if the comparison reveals that an operating parameter has changed.

## Claims

### Claim 1

A device comprising:
a communication device with an antenna to generate an electromagnetic field at regular intervals in a polling mode; and
a processor
to determine at least one operating parameter of the antenna whenever an electromagnetic field is generated,
to compare the at least one determined operating parameter with a corresponding previously determined operating parameter, wherein a change in the at least one operating parameter indicates that an object is approaching the device, and
to emit a signal if the comparison reveals that an operating parameter has changed.

### Claim 2 (depends on 1)

The device as claimed in claim 1, wherein the communication device comprises a near field communication device.

### Claim 3 (depends on 1)

The device as claimed in claim 1, wherein the at least one determined operating parameter comprises an amplitude of a voltage at the antenna or a phase angle between a voltage at the antenna and a current through the antenna.

### Claim 4 (depends on 1)

The device as claimed in claim 1, further comprising a control device to receive the signal from the communication device and to start passive start entry communication when it receives the signal.

### Claim 5 (depends on 1)

The arrangement as claimed in claim 1 wherein the communication device
changes to a standby mode after the polling mode, in which standby mode the antenna does not generate an electromagnetic field.

### Claim 6 (depends on 1)

The device as claimed in claim 1, wherein the antenna determines the at least one operating parameter at least once every 25-50 ms.

### Claim 7 (depends on 1)

The device as claimed in claim 1, further comprising the communication device disposed in a vehicle.

### Claim 8 (depends on 7)

The device as claimed in claim 7, further comprising the communication device arranged in a door handle, on a window, on a wing mirror, or in the B-pillar of the vehicle.

### Claim 9

A method for detecting an object the method comprising:
generating an electromagnetic field at regular intervals with an antenna associated with a communication device;
determining at least one operating parameter of the antenna whenever an electromagnetic field is generated;
comparing the at least one determined operating parameter with a previously determined operating parameter, and interpreting a change in the at least one operating parameter as indicating that an object is approaching the communication device; and
emitting a signal if the comparison reveals that an operating parameter has changed.