Haltech E6X Manual DOS Version - Manual (Page 85)

E6X Manual
85
Hot Min Position
Exactly the same as for when the engine is cold, except the value is used for when the
engine is hot, that is the temperature is above the Cold Temperature Limit.
Cold Opening position (%)
This is the opening position as a percentage of where the stepper motor will return to
when it is about to attempt to gain control of the engine. When you hit the throttle the
engine will accelerate and when it starts to decelerate again, there will come a point
during the deceleration when the Idle Control should attempt to regain control of the
engine and bring it to the target idle RPM. The value you set here will result in the
stepper motor assuming a certain position, say 40% out. It will wait here until the
decelerating engine comes within range and it feels it can take over control of the
engine and bring it back to idle. It will then assume control of the engine with the
valve open at 40%. This may be too high which will result in the engine momentarily
holding at the RPM produced by the valve at 40% opening. This means that it will
take a longer period of time to move the engine back down to target idle.
On the other hand, 40% may be too low and when the engine is decelerating, the Idle
Control will try to regain control at a point where the valve is going to cause the
engine to go very close to stalling. The secret is to start with a large value and reduce
it until it takes a normal amount of time for the idle control to regain control of the
decelerating engine and bring it back to target idle. A normal amount of time is a hazy
description but it is somewhere in the vicinity of not too small so as to go close to
stalling the engine and not too large as to take many seconds to return to target idle.
Hot Opening Position (%)
Exactly the same as for when the engine is cold, except the value is used for when the
engine is hot, that is the temperature is above the Cold Temperature Limit.
12.1.2 O2 Closed Loop Fuel Control
The O2 closed loop fuel control window of the output option page has a series of fields that
require configuration:
Lower RPM Limit
The engine must be running above this speed for the closed loop function to operate.
Normally this would be set a few hundred rpm above or below idle, depending on
whether you wish closed loop control to occur at idle speeds.
Upper Throttle Limit
It is generally undesirable to run an engine at stoichiometric air-fuel ratio when under
load. This parameter is used to determine when the driver is demanding sufficient
engine output to disengage the closed loop function. The smaller this number, the
earlier the feedback control will drop out.
Engine Cycles Between Corrections
The oxygen sensor does not respond immediately to the exhaust gases of the
combustion which has just taken place. There is a gas transportation time from the
engine to the sensor, plus the sensor reaction time itself. Consequently, the ECU
counts a number of engine cycles before accepting the reading from the oxygen