Ignition system for internal combustion engines

US4359036A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl Seeger · Ditzingen, DE
• Werner Jundt · Ludwigsburg, DE
• Manfred Mezger · Markgröningen, DE

Key dates

• Filing date: Dec 5, 1980
• Grant date: Nov 16, 1982
• Expiry date: Dec 5, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P7/0672
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An ingition system for internal combustion engines has dwell angle control apparatus for controlling the switching times of an electronic switch (21) in the primary circuit of an ignition coil (22) in dependence on the signals of a rotating sensor (10) or an ignition computer (11). Specifically, speed dependent counting values are periodically generated in a counting apparatus (13) each being counted down in a further counting apparatus (14) controlled by an edge of the sensed signal or a computed signal. Upon reaching a presettable triggering counting value, the electronic switch (21) is closed (start of dwell period). This triggering value is set by periodic up and down counting processes in a control counter (17) the upwards counting being constant with respect to time and the count-down process being determined by the length of time of current flow above a settable current value through the ignition coil (23). This allows the counting process of the speed dependent counting value to be triggered and the electronic switch to be opened (ignition time) by a single sensed signal edge per cycle.