Electronic control unit for variable PWM communication

Details Electronic control unit for variable PWM communication Electronic control unit for variable PWM communication

2005-11-01

2005-11-01

Holloway, III, Edwin C. (Department: 2635)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S870030, C340S005610, C340S010300

Reexamination Certificate

active

06960982

ABSTRACT:
An electronic key entry system for vehicles has a security ECU mounted in a vehicle for checking an electronic key via radio communication with the same. The ECU includes a CPU and a PWM output unit. The PWM output unit generates an interrupt request at every edge time of PWM pulse transmitted to the electronic key. The CPU sets a pattern of PWM output of a next cycle in response to the interrupt request so that the PWM output unit transmits a pulse corresponding to the set PWM output pattern. The CPU also stops pulse transmission, when no response is received from the electronic key in the course of communication in a plurality of stages.

REFERENCES:
patent: 4509093 (1985-04-01), Stellberger
patent: 5345231 (1994-09-01), Koo et al.
patent: 5790014 (1998-08-01), Campbell et al.
patent: 6023199 (2000-02-01), Cheung
patent: 6323566 (2001-11-01), Meier
patent: 6366197 (2002-04-01), Tarquinio
patent: U-2-107674 (1990-08-01), None
patent: A-7-170581 (1995-07-01), None
patent: A-8-149126 (1996-06-01), None

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