KMS 06.001-1, Руководство пользователя

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KMS MA-5 manual
Version 5.1 33
Parameters Boost Control
Solenoid frequency:
Each control valve has a specific frequency at which it
operates best. This frequency can be entered here
between 16 and 40 Hz.
Sample rate:
Specifies the number of measurements per second for
detecting boost pressure. In case of control instability,
you need to input a lower value. If the control system responds too slowly, a higher value has to be
entered.
Max PWM:
A linear solenoid valve will only open at a certain pulse width and reach a maximum opening at a
pulse width less than 100%. Here you need to enter the pulse width (as a percentage) above which
the solenoid valve will open completely.
– Only used for the Boost PID control
Min PWM:
Here you need to enter the pulse width (as a percentage) beneath which the solenoid valve will close
completely.
– Only used for the Boost PID control
Start RPM:
Here you can enter the rpm at which the control may activate. This helps avoid unnecessary operation
of the solenoid valve at low revs.
Boost Limit (ignition cut off):
In case the boost pressure exceeds the target value (risk of engine damage), you can specify a limit
with this parameter. When the boost pressure reaches this limit, ignition and injection will be
interrupted.
Setup pressure:
To allow the turbo system to respond as quickly as possible but not overshooting the target, it is
important that the PID control only activates above a certain boost pressure (the boost pressure
should reach first a stable pressure with the fixed PWM value). Therefore the setup pressure (in kPa)
should be kept slightly lower than the target boost pressure (recommended: 20
– 40 kPa below target
pressure). From this setup pressure the PID starts to control the boost up to the target.
So it is important that boost pressure will reach setup pressure with the fixed PWM values, otherwise
PID control will not activate!
Setup hysteresis:
Once the setup target pressure has been reached and the pressure consequently decreases, it is
advisable not to switch off the control at once, but to allow for a certain pressure reduction prior to
switching off.
– Only used for the Boost PID control