Haltech E8 - Manual (Page 109)

Haltech E11/E8 Instruction Manual
Figure 110 - Closed Loop Boost Control Parameters
Settings
• TWG Frequency - Frequency (Hz) that the waste gate solenoid will run at. A Typical value for the
Haltech waste gate solenoid is a frequency of 20 – 30 Hz.
• Start Duty Cycle - This is the duty cycle that the waste gate will go to when closed loop boost
control begins. This duty cycle should cause the boost to read somewhere below the target boost
level. If this value is too high then the boost will overshoot the target boost level before it returns to
the target. If too low the boost may dip down a bit before being controlled.
• Control Point Before Target - An offset in kPa or PSI from the target boost level at which boost
control will begin This value maybe increased for applications where boost is made extremely quick
and to give the controller more time to react. E.G. if the boost target is 120 kPa and the ‘Control Point
Before Target’ is set to 20 kPa then boost control will begin at 100 kPa. Default 20 kPa or 3 PSI.
• Delay till Boost Control - Once the boost controller has reached the ‘Control Point Before Target’ it
will hold at the start duty cycle for this amount of time before controlling boost. Default 0.5 sec.
• Start Duty By Map - When checked it will ignore the ‘Start Duty Cycle’ value above and base it off
the Start Duty Map.
• Use Boost Map 2 - Check this box to use ‘Closed Loop Boost Target Map2’ as the target map.
• Start Duty Map - Output Start Duty Cycle vs. Target Boost Level. This map can be used when the
target boost level that the boost controller is aiming for changes each time it goes to control boost.
Such situations where this map is needed are when using the closed loop boost control trim or gear
boost correction.
• Boost Target Map - Output Target Boost vs. RPM. Allow the setting of different target boost levels
over the range of RPM.
• Proportional/Integral/Derivative - Values are used to alter the gains and response of the controller.
Derivative should remain at zero.
Copyright © Haltech 2008 Page: 109