Protected control apparatus

Details Protected control apparatus Protected control apparatus

2006-09-19

2006-09-19

Cronln, Stephen K. (Department: 3747)

Internal-combustion engines

Starting device

Condition responsive control of starting device

C361S029000, C307S141000

Reexamination Certificate

active

07107957

ABSTRACT:
A control apparatus for protected switching of a load encompasses at least two switch units in series with a load, to permit delivery of energy to a load when each switch unit is switched on and to block it when at least one of the switch units is shut off; an electronic control system for triggering each switch unit via a first switching path and second switching paths, and for monitoring its state; a delay element on the first switching path, such that each switch unit can be shut off both by way of a shutoff signal conveyed via the first switching path and by way of a shutoff signal conveyed via the second switching path; and in a state in which one of the switch units is shut off and the other is switched on, the electronic control system ascertains a malfunction of the first switching path if, after output of a shutoff signal on the first switching path, the other switch unit does not shut off within a predefined time window.

REFERENCES:
patent: 3960121 (1976-06-01), Backus
patent: 4898132 (1990-02-01), Kanno
patent: 5574320 (1996-11-01), Shirai et al.
patent: 197 20 191 (1998-04-01), None

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