Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1982-05-03
1984-02-28
Cox, Ronald B.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
123609, F02P 100
Patent
active
044336705
ABSTRACT:
The period of conduction of an electronic interrupter of an ignition circuit is made shorter increasingly with falling engine speed in comparison to the duration of the period for which the switching path of the engine driven timing generator maintains its condition immediately before the ignition moment. During the time in which that condition is maintained immediately before changing at the ignition moment a capacitor (26) is provided with a first change (b) of its charge in a first direction and thereafter a second change (c) thereof is produced in the other direction. The switching of the electronic interrupter (7) into the conducting condition occurs when the charge of the capacitor reaches a threshold value during the second change of the charge. That threshold value is modifiable by a regulating value that depends at least in part on the engine speed. A monitoring circuit (39) is provided for the capacitor and provides a signal when the charge reaches a reference value which corresponds to the charge that can be reached at an engine speed that lies below the idling of the engine. The signal of the monitoring circuit is used to modify the regulating value that alters the threshold charge value, so that the threshold is reached sooner.
REFERENCES:
patent: 4153032 (1979-05-01), Chateau
patent: 4267813 (1981-05-01), Hohne
patent: 4280461 (1981-07-01), Okuda
patent: 4356808 (1982-11-01), Bodig
patent: 4366800 (1983-01-01), Seeger
patent: 4391262 (1983-07-01), Schleupen
Cox Ronald B.
Robert & Bosch GmbH
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