Enrichments; Afterstart Enrichment; Warmup Table; Acceleration Enrichment - ECU Master EMU User Manual

ENRICHMENTS

Afterstart enrichment

Afterstart enrichment function enables a fuel
dose enrichment for a set number of engine
cycles after engine start. Values in the table
define the initial enrichment rate. With every
engine cycle after start this value decreases
linearly to zero. Initial enrichment value as a
function of engine temperature can be set in
ASE table.

Warmup table

Warmup enrichment compensates for poor fuel vaporization in low temperatures. Enrichment
should be set to 100% (no enrichment) at normal operating temperature. To protect engine from
overheating, fuel dose can be enriched in excessively high temperature range. Additional fuel
vaporization will help to cool the engine.

Acceleration enrichment

During sudden acceleration (fast throttle opening), engine air flow increases rapidly and causes a
temporary "lean" condition. To compensate for this, Acceleration Enrichment is used. Its calculation
is based on throttle opening speed (dTPS), actual throttle angle (TPS), current engine RPM and
temperature.
Acc enrich. = dTPS rate(dTps) * RPM Factor(rpm) * TPS Factor(tps) * CLT Factor(clt)
PARAMETER
dTPS Threshold
Sustain rate
Enrichment limit
DESCRIPTION
Minimal dTPS value to apply Acceleration Enrichment. This feature used to
filter out minor changes in TPS value caused by electrical noise.
Percentage of enrichment sustained to next engine cycle. A higher value here
results in longer lasting enrichment.
Maximum enrichment value allowable. This value is used to trim enrichment
independently of enrichment calculation.
Enrichment (%)
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Start enrichment
ASE
Duration
Engine's cycles