US 2006/0077037 A1 · Remote keyless entry system with two-way long range communication

Abstract

Vehicle information (e.g., status information, calibratable parameters, or diagnostic data) is transmitted from a base station mounted in a vehicle to a portable RKE fob via a radio-frequency signal within a specified average field strength limit. A multi-byte vehicle message is formed and then coded into a multi-bit coded message. The multi-bit coded message is framed into a plurality of packets. The radio-frequency signal is wirelessly transmitted from the base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of the plurality of packets. The radio-frequency signal within each of the packet windows has a predetermined field strength greater than the average field strength limit and a substantially zero field strength between the packet windows. The predetermined duty cycle results in an actual average field strength for transmitting all of the packets not exceeding the average field strength limit.

Claims20

Dependent claims

A method of transmitting vehicle information from a base station mounted in a vehicle to a portable RKE fob via a radio-frequency signal within a specified average field strength limit, said method comprising the steps of:

forming a multi-byte vehicle message;
coding said vehicle message into a multi-bit coded message;
framing said multi-bit coded message into a plurality of packets;
wirelessly transmitting said radio-frequency signal from said base station with a plurality of spaced packet windows having a predetermined duty cycle, each packet window including a respective one of said plurality of packets, wherein said radio-frequency signal within each of said packet windows has a predetermined field strength greater than said average field strength limit and a substantially zero field strength between said packet windows, and wherein said predetermined duty cycle results in an actual average field strength for transmitting all of said packets not exceeding said average field strength limit;
receiving said plurality of packets within said portable RKE fob;
and
recovering said vehicle message in response to said received plurality of packets.

4 more elements

A portable RKE fob for wirelessly receiving a radio-frequency signal broadcast from an RKE base station in a vehicle, wherein said radio-frequency signal encodes vehicle information, wherein said radio-frequency signal is broadcast as a plurality of packets within a plurality of spaced packet windows, wherein said radio-frequency signal has a predetermined field strength in each of said packet windows and has a substantially zero field strength between said packet windows, said spaced packet windows providing a predetermined duty cycle so that an average field strength for transmitting all of said packets falls within a specified average field strength limit, said portable RKE fob comprising:

a transceiver for wirelessly receiving said plurality of packets;
and
a message controller for recovering said vehicle message by de-framing said plurality of packets into a multi-bit coded message, and decoding said multi-bit coded message into a multi-byte vehicle message;
and
a display for displaying said vehicle information in response to said vehicle message.

2 more elements

Dependencies are inferred from the claim text.

Remote keyless entry system with two-way long range communication

Life of this patent

Remote keyless entry system with two-way long range communication

Life of this patent

Abstract

Claims20