KMS MP25(M)/MA25(M) manual Version 4.2
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For inputting the desired A/F ratio for idle rpm.
The range is limited by ‘idle mix Throttle pos’ and ‘idle mix RPM’ which will be explained later.
Idle Sample delay:
During idle rpm, the sampling rate needs to be much lower (for smooth engine operation). This
parameter sets the time span between two measurements.
Recommended value: 0.5 - 1.0 sec.
Idle mix Throttle pos:
When the throttle angle decreases under the threshold set here, this is considered as idle. In other
words, the sampling or measurement frequency becomes dependent on the value set under ‘Idle
Sample delay’ while the A/F ratio adopts the desired value of the ‘Idle A/F mix’.
Recommended value: 0.5 - 2.0 TPS-value
Idle mix RPM:
When the engine speed decreases under the threshold set here, this is considered as idle. In other
words, the sampling or measurement frequency becomes dependent on the value set under ‘Idle
Sample delay’ while the A/F ratio adopts the desired value of the ‘Idle A/F mix’.
Recommended value: ±500 rpm higher than idle rpm.
Idle on delay:
This value specifies the delay before the ECU reactivates the A/F ratio feedback control after an
engine has returned to idle. In this way idle rpm can stabilize first before the A/F feedback control
takes effect.
Recommended value: 0.5 - 1.5 sec.
Throttle Red. To Lock:
During rapid reduction of the throttle position (without entering throttle overrun state) the air fuel
ratio feedback control has to be deactivated in most engines. At a certain deceleration speed the
lambda-signal is disturbed due to less efficient combustion. Here you can specify the decreasing
rate that triggers the de-activation of the lambda control. The value input here represents the
decrease in engine load between 30 ms.
Recommended value: 0.3 - 1.0
Red. Lock time:
If the A/F ratio feedback control has switched off during rapid deceleration, the control loop will
close again (if the throttle position stabilizes or increases again) after a time specified here.
Recommended: 0.5 - 1.0 sec.
Throttle Inc. To Lock:
During rapid increase of throttle position the air fuel ratio feedback control has to be deactivated in
most engines. Here you can specify the increasing rate that triggers the de-activation of the lambda
control. The value input here represents the increase in engine load between 30 ms.
Recommended value: 0.3 - 1.0
Inc. Lock time:
If the A/F ratio feedback control has switched off during rapid acceleration, the control loop will
close after a time specified here.
Recommended: 0.3 - 1.0 sec.
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