Terminology: Injector Duty Cycle & Injector Pulse Width
The Injector Duty Cycle (IDC) is basically the percentage of time an injector is energised (open) during an engines cycle i.e. 0% IDC injector is off, and 100% IDC the injector is permanently open. The Injector Pulse Width is the time an injector is energised (open). During normal operation the injector fires once per operational cycle.