Vehicular remote control system

• US 20040130457A1
• Filed: 10/03/2003
• Published: 07/08/2004
• Est. Priority Date: 10/08/2002
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company), Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hayashi, Naoki, Ueda, Shinichi, Yoshimura, Kentaro, Sueoka, Kazuhiko, Sawada, Kenichi, Kamikura, Akira, Asakura, Suguru, Arie, Shinichi
• Granted Patent: US 7,142,090 B2
• Time in Patent Office: Days
• US Class Current: 340/825.72
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G07C 2009/00357 and the lock having more than one limited data transmission ranges
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 2209/61 Signal comprising different frequencies, e.g. frequency hopping
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

A vehicular remote control system includes, on a portable device side, a portable device side first receiver, a portable device side transmitter, and a portable device side second receiver and, on a vehicle side, a vehicle side first transmitter, a vehicle side second transmitter, and a vehicle side receiver. Transmitting and receiving a request signal requesting an identification signal, the identification signal, an interrogation signal, and a response signal between the portable device and the vehicle allows a door lock actuator to be operated if the portable device is legitimate. When the vehicle side second transmitter or the portable device side second receiver breaks down, transmission and reception of a second request signal and the interrogation signal is carried out using the vehicle side first transmitter and the portable device side first receiver, thereby making the door lock actuator operate unhindered without the need for providing special alternative means.

Claims

1. A vehicular remote control system comprising:

a portable device side first receiver which carries out reception at a first frequency, a portable device side transmitter which carries out transmission at a second frequency, and a portable device side second receiver which carries out reception at the second frequency, are each provided on a portable device side; and

a vehicle side first transmitter which carries out transmission at the first frequency, a vehicle side second transmitter which carries out transmission at the second frequency, and a vehicle side receiver which carries out reception at the second frequency, are each provided on a vehicle side,

the vehicle side first transmitter transmitting a request signal;

the portable device side transmitter transmitting an identification signal when the portable device side first receiver receives the request signal;

the vehicle side second transmitter transmitting an interrogation signal when the vehicle side receiver receives and authenticates the identification signal;

the portable device side transmitter transmits a response signal when the portable device side second receiver receives the interrogation signal;

operation of a device on the vehicle being permitted when the vehicle side receiver receives and authenticates the response signal,

wherein, when the vehicle side second transmitter or the portable device side second receiver breaks down, transmission and reception of the interrogation signal is carried out using the vehicle side first transmitter and the portable device side first receiver.

2. The vehicular remote control system according to claim 1, wherein when the vehicle side receiver does not receive the response signal until a predetermined period of time has elapsed since the vehicle side second transmitter transmitted the interrogation signal, a determination is made that the vehicle side second transmitter or the portable device side second receiver has broken down.

3. The vehicular remote control system according to claim 1, wherein the second frequency is higher than the first frequency.