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US 5,327,320 AGranted
Apparatus for suppression of individual ignition events in an ignition system
AssigneeRobert Bosch GmbH
InventorUwe Fischer
Life of this patent
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Abstract
An apparatus for suppression of individual ignition events in an ignition system includes a short-circuit switch, connected in parallel to the primary winding of the ignition coil. The short-circuit switch is controlled by a control switch. In order to avoid having to provide a separate power supply to furnish triggering energy to the control switch, this energy is derived from the energy stored in the ignition coil during a closing phase of the ignition switch. This requires fewer components than prior art circuits designed for the same purpose.
Claims16
An apparatus for suppression of individual ignition events in an ignition system having
- at least one ignition coil (10), including a first primary winding connection (15) which is connected to a controllable ignition switch (17) and to an electrically controllable short-circuit switch (21) located on the primary side of the ignition coil (10), said short-circuit switch serving to suppress any primary-side high voltage occurring after opening of the controllable ignition switch (17),
- wherein control energy for actuation of the short-circuit switch (21) is furnished from electromagnetic energy stored in the ignition coil (10) during a closing phase of operation of the ignition switch (17).
Dependencies are inferred from the claim text.