by Stephen Dean on Mon Sep 27, 2021 11:00 am
Engine speed limiting during Launch uses the Engine Speed table and Engine Speed Margin . The primary means of control is ignition retard.
While engine speed is above Launch Engine Speed, the Ignition Timing Limit Advance system attempts to control engine speed using closed loop control of ignition timing. If Engine Speed exceeds (Launch Engine Speed + Engine Speed Margin), a hard limit (ignition cut or/and potentially fuel cut) is applied. This allows turbocharged engines to develop boost pressure prior to launch.
This system aids initial take-off by means of ignition retard, engine speed limiting, electronic throttle control and boost aim control. It also provides fuel volume trimming to assist exhaust cooling.
Stephen Dean
MoTeC Research Centre Melbourne, Australia