Vehicular remote control system and tire pressure monitoring system

• US 20050162259A1
• Filed: 12/23/2004
• Published: 07/28/2005
• Est. Priority Date: 12/25/2003
• Status: Active Grant

• Current Assignee: Omron Automotive Electronics Company Limited (Nidec Corporation)
• Original Assignee: Omron Corporation
• Inventors: Hotta, Shinji, Yoshimura, Toshihiko
• Granted Patent: US 7,181,189 B2
• Time in Patent Office: Days
• US Class Current: 340/426.130
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right
• CPC Class Codes: B60C 23/0433 Radio signals
• CPC Class Codes: B60C 23/0462 Structure of transmission protocol
• CPC Class Codes: B60R 25/246 characterised by the challenge triggering
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: 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
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

In a vehicular smart entry system, it is to shorten a delay time from the time a trigger occurred to the time a locking/unlocking operation of a door is performed.

When a request signal is transmitted from a transmission antenna at a position where the trigger occurred (for example, the right exterior antenna 25), an interrupt signal (an inverse signal with a pulse string at the modulation inverted with respect to the request signal) for preventing reception of the request signal at any other position than the above position is transmitted from the transmission antenna (for example, left exterior antenna) arranged at any other position than the above position, simultaneously with the request signal.

Claims

1. A vehicular remote control system comprising

a mobile unit portable by a user,

a vehicle unit for establishing bidirectional wireless communication with this mobile unit, which is able to transmit a wireless signal to the mobile unit through transmission antennas provided at a plurality of positions of a vehicle, and

operational intention detection means, provided at a plurality of positions of the vehicle corresponding to the transmission antennas, for detecting operational intention of a user approaching the positions, in which

when a user'"'"'s operational intention is detected by the operational intention detecting means, this works as a trigger, a predetermined request signal is transmitted from the vehicle unit to the mobile unit through the transmission antenna arranged at the corresponding position of the vehicle, and the vehicle unit performs a predetermined processing operation according to the received result of an answer signal transmitted from the mobile unit in reply to this request signal, and

at the same time when the request signal is transmitted through the transmission antenna at the position where the trigger occurred, the vehicle unit transmits an interrupt signal for preventing reception of the request signal, through the transmission antenna arranged at any other position than the above position, at least at one moment of a time period during which the request signal is being transmitted.

2. The vehicular remote control system according to claim 1, in which

the interrupt signal is transmitted from the respective transmission antennas arranged at any other positions than the above position, with time difference.

3. The vehicular remote control system according to claim 1, in which

the request signal is a signal of digital wireless method to be transmitted after modulation of carrier wave with a pulse string of digital data and the interrupt signal is an inverse signal with the pulse string at the modulation inverted with respect to the request signal.

4. The vehicular remote control system according to claim 1, in which

the processing operation is control processing for locking/unlocking or opening/closing a door or a trunk of the vehicle, the transmission antenna and the operational intention detecting means are provided on the both sides of the vehicle having doors or on the rear side of the vehicle having the trunk, and the operational intention is concerned about locking/unlocking or opening/closing the door or the trunk of the vehicle.

5. A tire air pressure monitoring system comprising

a controller on a vehicle side which is able to transmit a wireless signal through each transmission antenna on the vehicle side provided for every specified tire of the vehicle in the vicinity of each corresponding tire, and

a sensor unit, provided in each tire of the vehicle, which is able to measure air pressure of each tire and transmit the measurement result as wireless signal, in which

the controller on the vehicle side transmits a request signal to the sensor unit of the corresponding tire through the transmission antenna on the vehicle side at a predetermined position at a predetermined timing and upon receipt of this, the sensor unit transmits an answer signal including the measurement result to the controller on the vehicle side, and

at the same time when transmitting the request signal through the transmission antenna on the vehicle side at the predetermined position, the controller on the vehicle side transmits an interrupt signal for preventing reception of the request signal through the transmission antenna on the vehicle side arranged at any other position than the above predetermined position, at least at one moment of a time period during which the request signal is being transmitted.

6. The tire air pressure monitoring system according to claim 5, in which

the interrupt signal is transmitted from each of the transmission antennas arranged at any other position than the above predetermined position, with time difference.

7. The tire air pressure monitoring system according to claim 5, in which

the request signal is a signal of digital wireless type to be transmitted after modulation of carrier wave with a pulse string of digital data and the interrupt signal is an inverse signal with the pulse string at the modulation inverted with respect to the request signal.