Ignition system for detecting arc voltage of spark plug
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United States of America Patent
Stats
-
Aug 1, 1995
Grant Date -
N/A
app pub date -
May 7, 1993
filing date -
Dec 10, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit arrangement for ignition systems for detecting an arc voltage at a spark plug has an ignition coil having a primary side on which the arc voltage is transformed and also having a primary winding, an ignition switch located in series with the primary winding of the ignition coil, a pnp transistor working as a voltage converter and having a control stage so that the arc voltage transformed on the primary side activates the control stage. The transistor is connected on an emitter side to a connection between the primary winding and the ignition switch. The pnp transistor is connected on a base side to a battery voltage. A resistor is assigned as an emitter follower to the pnp transistor. A measuring element is formed as a resistor. The transistor with its collector connection feeds to the measuring element a collector current which is proportional to the arc voltage.
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