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XDI200 Manual Version 0.1
- Page 98 -
©2017 Electromotive, Inc.
General Purpose Inputs (GPI):
Input channels that the
XDI200
can use to process data from
sensors that are not related to the core engine management sensors. Switches and vehicle speed
sensors can be run to the GPIs.
General Purpose Outputs (GPO):
Output channels from the
XDI200
that can be used to trigger
external devices such as thermo fans, torque converters, etc.
Horsepower (HP):
A measurement of the rate at which an engine can perform work. One HP = 550
lb-ft per second.
Idle Air Control (IAC) Motor:
A device that is used to meter air into an engine at idle. Air from the
outside of the intake manifold is regulated into the intake plenum by the IAC motor.
Ignition Timing:
The amount of degrees before Top Dead Center that a spark plug fires.
Knock Sensor:
A device used to measure detonation.
Knocking:
see ‘Detonation’
Load:
The amount of work that an engine must provide at a given instant. Load is measured by
using the MAP sensor to estimate the cylinder pressure on
XDI200
systems. Higher loads result in
higher MAP readings.
Manifold Air Pressure (MAP) Sensor:
A device that measures the absolute pressure of the intake
charge for an engine.
Manifold Air Temperature Enrichment:
An inlet air temperature-based enrichment that is used to
add fuel when the incoming air is cold, and therefore denser than usual.
Manifold Air Temperature (MAT) Sensor:
A device that measures the temperature of the incoming
air charge for an engine.
Millisecond (ms):
A length of time equal to one one-thousandth of a second.
1 millisecond = 0.001 second
Pinging:
See ‘Detonation’.
Retard:
As applied to ignition timing, retarding the timing refers to firing the spark plug comparatively
later.
Rich Mixture:
An air-fuel mixture that carries more fuel than the stoichiometric air-fuel ratio.
Spark Knock:
See ‘Detonation’
TDC (Top Dead Center):
On piston engines, when a piston is at its highest point (closest to the
cylinder head), and the combustion chamber is at its smallest volume, it is at TDC. TDC#1 refers to
the case when the #1 cylinder is on TDC. On rotary engines, TDC occurs when the combustion
chamber volume is smallest.