Passive keyless entry device for monitoring tire pneumatic pressure by bidirectional communication

• US 20040113765A1
• Filed: 12/04/2003
• Published: 06/17/2004
• Est. Priority Date: 12/10/2002
• Status: Active Grant

• Current Assignee: Alps Alpine Co., Ltd.
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Suitsu, Katsumi
• Granted Patent: US 7,113,083 B2
• Time in Patent Office: Days
• US Class Current: 340/445
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
• CPC Class Codes: B60C 23/044 Near field triggers, e.g. magnets or triggers with 125 KHz
• CPC Class Codes: B60C 23/0442 the transmitted signal comprises further information, e.g. instruction codes, sensor characteristics or identification data
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 2209/62 Comprising means for indicating the status of the lock
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

A passive keyless entry device is constructed by a car mounting device mounted to an automobile, a portable device and transmitter-receivers for monitoring a tire pneumatic pressure. The car mounting device has a low frequency signal transmitting section for transmitting a request signal to the portable device and the transmitter-receivers for monitoring the tire pneumatic pressure, a receiving section for a keyless entry for receiving an answer signal responsive to the request signal from the portable device, a receiving section for monitoring the tire pneumatic pressure for receiving the answer signal responsive to the request signal from the transmitter-receivers for monitoring the tire pneumatic pressure, and a controller for forming the request signal and controlling the operation of a door lock mechanism in response to the answer signal and displaying tire pneumatic pressure information.

Claims

1. A passive keyless entry device for monitoring a tire pneumatic pressure by bidirectional communication, is including a car mounting device mounted to an automobile, a keyless entry portable device and a transmitter-receiver for monitoring the tire pneumatic pressure, wherein said car mounting device comprises a low frequency signal transmitting section for transmitting a request signal of a low frequency to said keyless entry portable device and said transmitter-receiver for monitoring the tire pneumatic pressure, a receiving section for a keyless entry for receiving an answer signal of a high frequency responsive to said request signal from said keyless entry portable device, a receiving section for monitoring the tire pneumatic pressure for receiving the answer signal of the high frequency responsive to said request signal from said transmitter-receiver for monitoring the tire pneumatic pressure, and a controller for forming said request signal and controlling the operation of a door lock mechanism in response to said answer signal and obtaining tire pneumatic pressure information.

2. The passive keyless entry device for monitoring the tire pneumatic pressure by the bidirectional communication, according to claim 1, wherein four antennas for transmitting low frequencies commonly used are connected to said keyless entry portable device and said transmitter-receiver for monitoring the tire pneumatic pressure in said low frequency signal transmitting section.

3. The passive keyless entry device for monitoring the tire pneumatic pressure by the bidirectional communication, according to claim 1, wherein four receiving antennas for high frequencies are connected to said receiving section for monitoring the tire pneumatic pressure.

4. The passive keyless entry device for monitoring the tire pneumatic pressure by the bidirectional communication, according to claim 1, wherein said transmitter-receiver for monitoring the tire pneumatic pressure obtains the pneumatic pressure information from a pneumatic pressure sensor mounted to each tire.