Patent · US Expired

Apparatus for maintaining constant ignition energy with increasing engine speeds in an ignition system for an internal combustion engine

US4271812A · kind A · utility

8Cited by

5References

7Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernd Bodig · Leinfelden, DE
Helmut Schmied · Erbach, DE
Gerd Hohne · Ludwigsburg, DE
Adolf Fritz · Stuttgart, DE

Key dates

Filing date	Jul 26, 1979
Grant date	Jun 9, 1981
Priority date	—
Expiry date	Jul 26, 1999

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02P3/0453
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In order to increase the closure angle of an interrupter switch connected in series with the primary winding of an ignition coil with increasing engine speeds, a capacitor is connected to the input of a trigger circuit whose output controls this closure angle. The capacitor is charged through a diode while the trigger circuit is switched out. The voltage across the capacitor shifts the threshold of the trigger circuit in a direction increasing the time that the interrupter switch is conductive. The charge on the capacitor is controlled by a signal generator which furnishes an output signal having an amplitude increasing with increasing engine speeds. The closure angle of the interrupter switch therefore also varies as a function of engine speed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.