MoTeC M84 - Manual (Page 77)

MoTeC Appendices 75
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 and is suitable for very low ohm
injectors including 0.5 ohms.
Peak Current: Programmable from 0 to 6 Amps
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.