KMS MP25(M)/MA25(M) manual Version 4.2
35
3.2.4.1.10 Boost control
In this menu, the parameters for boost control can be
set.
Boost value calibration:
First of all, the boost pressure readout has to be
calibrated so that the boost pressure indicated in the
communication bar corresponds to the actual
pressure.
Boost at MAP output 3.75 V:
For inputting the boost pressure (kpa) at a MAP sensor
(manifold pressure sensor) output voltage of 3.75 V.
These calibration values are included with the KMS MAP
sensors.
Boost at MAP output 1.25 V:
For inputting the boost pressure (kpa) at a MAP sensor (manifold pressure sensor) output voltage of
1.25 V. These calibration values are included with the KMS MAP sensors.
Solenoid off is:
If there is no current to the solenoid valve, the boost pressure will
adopt either minimum or maximum pressure depending on the
connection of the solenoid valve. Here you need to select the correct
control boxes.
Boost control (on/off):
Here you can decide to switch the boost control on or off. If the boost control is activated in the
hardware configuration, the boost pressure will be regulated by the PWM percentages in the PWM
table.
Boost PID control:
Here you can select to activate the control to not only use the fixed PWM values from the PWM
chart but PID control calculates an ‘error’ value between the measured and the target boost. The
controller attempts to minimize the ‘error’ by adjusting the solenoid position untill the desired
boost is reached.
This control will only reach the set target pressure if the throttle position value is 15. If the throttle
position value is not 15, this control will not be active. However, if the boost pressure exceeds the
target pressure in spite of the specified PWM values, the control will intervene to prevent the boost
pressure from increasing further.
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