Keyless Device of Vehicle

• US 20090289759A1
• Filed: 06/26/2007
• Published: 11/26/2009
• Est. Priority Date: 07/06/2006
• Status: Active Grant

• Current Assignee: Calsonic Kansei Corporation
• Original Assignee: Calsonic Kansei Corporation
• Inventors: Otsuka, Takashi, Tsuchiya, Nobuaki
• Granted Patent: US 8,264,324 B2
• Time in Patent Office: Days
• US Class Current: 340/5.720
• CPC Class Codes: B60R 25/245 where the antenna reception area plays a role
• 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

A keyless device of a vehicle sets to change a search area “A” of a vehicle exterior antenna 45 to a search area “A2” that is smaller than a normal area “A1”, and an overlapped area of a search area “B” of a vehicle exterior antenna 46 and a normal search area “B1” is set to correspond only to an interior of the vehicle.

Claims

1. A keyless device of a vehicle comprising:

an on-vehicle device provided with a plurality of search signal transmitting means that each transmits a search signal to an interior and an exterior of the vehicle to search a portable device and with an answer signal receiving means that receives an answer signal replied to the search signal by the portable device;

a portable device provided with a search signal receiving means for receiving the search signal and with an answer signal transmitting means for transmitting the answer signal;

a position detecting means that is capable of detecting based on the answer signal that the portable device is within a search area where the search signal transmitting means can search the portable device; and

a search area setting means that is capable of setting the search areas in such a way that a first search area of a first search signal transmitting means and a second search area of a second search signal transmitting means differ in area from each other and an overlapped area of the first and second search areas corresponds only to the interior of the vehicle.

2. The keyless device according to claim 1, wherein

the search area setting means changes outputs of the search signal transmitting means to set the first search area and the second search area.

3. The keyless device according to claim 1, wherein

the answer signal transmitting means transmits the answer signal in a case where a receiving intensity of the search signal received by the search signal receiving means is larger than a threshold value, and

the search area setting means changes the threshold value to set the first search area and the second search area.

4. The keyless device according to claim 1, wherein

the on-vehicle device is provided with a vehicle interior search signal transmitting means that is capable of transmitting the search signal for searching a position of the portable device, and with a fault diagnosis function of the vehicle interior search signal transmitting means, and wherein

the search area setting means is activated in a case where the vehicle interior search signal transmitting means is diagnosed to be broken down.

5. The keyless device according to claim 2, wherein

the answer signal transmitting means transmits the answer signal in a case where a receiving intensity of the search signal received by the search signal receiving means is larger than a threshold value, and

the search area setting means changes the threshold value to set the first search area and the second search area.

6. The keyless device according to claim 2, wherein

the on-vehicle device is provided with a vehicle interior search signal transmitting means that is capable of transmitting the search signal for searching a position of the portable device, and with a fault diagnosis function of the vehicle interior search signal transmitting means, and wherein

the search area setting means is activated in a case where the vehicle interior search signal transmitting means is diagnosed to be broken down.

7. The keyless device according to claim 3, wherein

the on-vehicle device is provided with a vehicle interior search signal transmitting means that is capable of transmitting the search signal for searching a position of the portable device, and with a fault diagnosis function of the vehicle interior search signal transmitting means, and wherein

the search area setting means is activated in a case where the vehicle interior search signal transmitting means is diagnosed to be broken down.

8. The keyless device according to claim 5, wherein

the on-vehicle device is provided with a vehicle interior search signal transmitting means that is capable of transmitting the search signal for searching a position of the portable device, and with a fault diagnosis function of the vehicle interior search signal transmitting means, and wherein

the search area setting means is activated in a case where the vehicle interior search signal transmitting means is diagnosed to be broken down.