Engine combustion control with ignition timing by pressure ratio management
This patent describes an ignition timing control for an internal combustion engine of the type having a combustion chamber, a rotating crankshaft and ignition apparatus for the combustion chamber. The control comprises in combination: means responsive to combustion chamber pressure to generate signals for a combustion event indicating combustion pressure and motored pressure at a first predetermined crankshaft rotational angle during combustion and at a second predetermined crankshaft rotational angle at substantially complete combustion; means effective to compute, from the signals, first and second pressure ratios of combustion pressure to motored pressure at the first and second crankshaft rotational angles, respectively; and means responsible to the last means to adjust the ignition timing to maintain a predetermined ratio between the first and second pressure ratios each decreased by one, whereby combustion timing is controlled in closed loop to an MBT value.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4622939
- OSTI ID:
- 7153756
- Resource Relation:
- Patent File Date: Filed date 28 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IGNITION SYSTEMS
COMPUTERIZED CONTROL SYSTEMS
INTERNAL COMBUSTION ENGINES
COMBUSTION CONTROL
TIMING CIRCUITS
COMBUSTION CHAMBERS
INCIDENCE ANGLE
PRESSURE EFFECTS
ROTATION
SHAFTS
SIGNALS
CONTROL
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
ENGINES
HEAT ENGINES
MACHINE PARTS
MOTION
330100* - Internal Combustion Engines