MoTeC M880 - Manual (Page 85)

MoTeC Appendices 83
Appendix F: Injector Output Characteristics
The Injector outputs can operate in two modes: Peak and Hold mode and
Saturated mode.
Peak and Hold Mode
This mode is normally required for low resistance injectors (5 ohms or less).
This mode allows the injector current to build up to a high value to open the
injector and is then reduced to minimise power dissipation in the injector.
Normally this means that the ECU has to dissipate a large amount of power.
MoTeC uses a switch mode technique to minimise power dissipation in the
ECU. The opening current is referred to as the Peak current and the reduced
current as the Holding current.
The peak current is fully programmable from 0 to 6 Amps and is suitable for
very low ohm injectors including 0.5 ohms.
Holding Current: 25% of Peak Current
Flyback Voltage: 60V
Diagnostics: Open Circuit, Short to Battery, Peak current not reached.
Saturated Drive Mode
This mode is normally used for high resistance injectors (12 ohms or greater).
Nominal Maximum Current: 2 Amps
Current Limit: 4 Amps
Flyback Voltage: 60V
Diagnostics: Open Circuit, Short to Battery
High / Low Injection
The injector output characteristics may be set independently for High/Low
injectors allowing two different types of injectors to be used.