AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual

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Glossary of Terms

397

Combustion Chamber
Space left between the cylinder head and the top of the piston at TDC; where combustion of the
air-fuel mixture takes place

Compression Ratio
The ratio of the cylinder volume at BDC to the volume at TDC

Options
Single value in an engine calibration. Can sometimes be referred to as an option. Options and
tables (2D and 3D) make up the tunable portion of an engine calibration file.

Continuity
Little or no resistance in an electrical circuit to the flow of current. A solid electrical connection
between two points in a circuit. The opposite of an open circuit.

Controller
In automotive electronics, refers to a module made up of semiconductor circuits sometimes
containing embedded software code

Data
Information calculated or obtained directly from sensor inputs to a controller

Data Analysis
The task of interpreting information obtained from engine sensors and controller calculations

Density
The ratio of the mass of something to the volume it occupies. Air has less density when it is warm
and less density at higher altitudes.

Digital Circuit
Electronic circuits whose outputs can change only by specific amounts and between a limited
number of different voltages

Stoichiometric
The air/fuel ratio for complete combustion; all the fuel is burned using exactly all the oxygen in the
air. For gasoline, this ratio is 14.7:1 or 14.7 parts of air to 1 part fuel.

Display
Device used to indicate information in a human-readable form

Drivability
Condition describing a car in which it starts easily and idles, accelerates and shifts smoothly and
with adequate power for varying temperatures