Keyless entry system for automotive devices with feature for giv

Details Keyless entry system for automotive devices with feature for giv Keyless entry system for automotive devices with feature for giv

1984-09-18

1987-06-02

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

34082569, 340 52D, 70257, 180287, 307 10AT, G06F 704, B60R 2504, B60Q 100

Patent

active

046707468

ABSTRACT:
A keyless entry system can lock and unlock an automotive vehicle door, a trunk lid, a glove box and/or a steering column without an ignition key. The system comprises a transmitter producing a radio signal indicative of a preset unique code, and a controller receiving the radio signal and performing desired locking or unlocking operation when the code from the transmitter matches a preset code. A manual switch is provided to order the transmitter to transmit the code-indicative radio signal to the controller. The transmitter encloses a battery acting as a power source. Locking the transmitter in the vehicle is detected by detecting that the code signal level remains substantially unchanged for a given period of time after the vehicle is locked. In such cases, an alarm is produced to remind the driver to remove the transmitter from the vehicle cabin by operating the manual switch to open the door. An optional feature disables the keyless entry system if the driver fails the retrieve the transmitter after the alarm.

REFERENCES:
patent: 3196440 (1965-07-01), Weinstein
patent: 3723967 (1973-03-01), Atkins et al.
patent: 3866168 (1975-02-01), McGuirk, Jr.
patent: 3891980 (1975-06-01), Lewis et al.
patent: 4137985 (1979-02-01), Winchell
patent: 4205325 (1980-05-01), Haygood et al.
patent: 4223296 (1980-09-01), Kim et al.

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