Nira i7x - ALS - response system; ALS Cut Mode; Als Tps Hysteresis; Als Max Egtc

© 2005-2016 Nira Control AB 110
respectively. Control the airflow to reach roughly the desired RPM and then
fine-tune the idle speed by correcting ignition.
6.7 ALS – response system
ALS is used to maintain the boost pressure when the throttle angle is small.
This is done by increasing the airflow into the manifold, retarding ignition and
cutting ignition or fuel injection.
To increase the airflow, a separate solenoid is often used to increase the
throttle angle approximately 15%. This is only done whenever ALS is active,
which is when at least one of the values in ALS Ign Retard Table or ALS Cut
Percent Table is greater than zero.
6.7.1 ALS Cut Mode
ALS Cut Mode determines if ignition or fuel injection will be cut.
6.7.2 Als Tps Hysteresis
Als Tps Hysteresis determines the increase, in % per second, of TPS, which
causes ALS to be turned off regardless of the values in Als Cut and Als Ign
Ret.
Setting Als Tps Hysteresis to zero turns this function off.
6.7.3 Als Max Egtc
Maximum allowed exhaust gas temperature while ALS is active. For this
function to work, an EGTC must be connected to NIRA i7x.
If the exhaust gas temperature exceeds the value in ALS Maximum Exhaust
Gas Temperature, ALS is turned off.
6.7.4 Als Idle Rpm
This RPM limit comes into play if ALS gets deactivated due to throttle
hysteresis or the exhaust gas temperature was too high or if the ALS max
active time has been exceeded.
This prevents excessively high engine rpm if the throttle is open, the ignition
retarded and cut returns to zero.