Method and system to control ignition timing of an internal combustion engine in dependence on an exhaust gas composition signal

Patent · Tue Jan 13 00:00:00 EST 1981

OSTI ID:6368033

Gorille, I

The composition of exhaust gases from an ic engine is dependent on ignition timing; to control the composition, therefore, ignition timing is adjusted in accordance with sensed exhaust gas composition signals. To prevent abrupt change of ignition timing, as the exhaust gas composition signal changes upon change of exhaust gases between reducing and oxidizing state, a limit stage is included which limits the change of ignition timing between succeeding ignition events to a predetermined incremental crankshaft angle, for example 2*. The ignition angle adjustment may be nonsymmetrical in adding and subtracting direction, and, in any event, is limited to a maximum adjustment angle beyond which undesirable or unsafe operating conditions of the engine might obtain. In a preferred digital form, the count number of an accumulator counter, the output signal of which determines the occurrence of an ignition event, is modified, in said incremental steps, to thereby control the timing of the ignition event.

• Assignee: Bosch, Robert Gmbh (Germany, Federal Republic Of)
• Patent Number(s): US 4244339
• OSTI ID: 6368033
• Resource Relation: Patent Priority Date: Priority date 6 Sep 1977, German, Federal Republic of (F.R. Germany)
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
SPARK IGNITION ENGINES
AIR POLLUTION CONTROL
CONTROL SYSTEMS
EXHAUST GASES
MONITORS
CONTROL
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
POLLUTION CONTROL
WASTES
330101* - Internal Combustion Engines- Spark-Ignition
330700 - Advanced Propulsion Systems- Emission Control