Haltech E8 - Manual (Page 94)

Haltech E11/E8 Instruction Manual
Staged Injection
Figure 97 - Staged Injection Setup
Staged injection operates differently depending upon if the engine type is piston or rotary. When a rotary
engine is selected and Staged injection is enabled, a second fuel channel for each rotor is automatically
configured. Staged injection is much more common on rotary engines.
When using staged injection on a piston engine, you must configure Extra Injector outputs in the Auxiliary
Outputs to designate how many secondary injectors are available and on which outputs they appear
Staged Injection Modes
Primary Hold Mode
To minimise any step effect when the staged injectors begin, a Primary Hold Mode for staged injection is
available.
In Primary Hold Mode, the primary injectors hold at the current pulse width when the staging bar is
exceeded. The secondary injectors then begin to fire. However, when secondary injectors begin injection,
they cannot begin to inject smoothly from zero injection time due to the injector dead time of the
secondary injectors. This means that when the secondary injectors start, they must start from around 1ms
of injection time to overcome the effects of the injector dead time.
The Staged Dis-enrichment field is the amount of injection time that the primary injectors are reduced
when the secondaries begin. This is to compensate for the injector dead time of the secondary injectors.
Figure 98
Common Mode
In Common Mode, the pulse width of the primary injectors increase up to the staging bar as normal. When
the staging bar is exceeded, the secondary injectors begin to operate and both the primary and secondary
injectors begin to pulse at the same pulse width.
Page: 94 Copyright © Haltech 2008
Load
Primary Injectors
Load
Secondary Injectors
Injection
Time Injection
Time
Staging Bar Staging Bar
Dis-Enrichment