Pulse Count Injection
The novel concept of Pulse Count Injection (PCI) has been developed by Scion-Sprays to deliver the benefits of electronically controlled fuel injection at a fraction of the cost of currently available technology. The PCI injector combinesthe functions of fuel pumping, pressure regulation and metering, using a small geometrically fixed volume to repeatedly inject a known amount of fuel into the engine .
The number of pulses of injected fuel determines the amount of fuel delivered to the engine on a per cycle basis, as determined by the ECU controlling the system.which in turn is governed by the load.
The PCI Technology therefore contains significantly fewer parts than a conventional system but still delivers an accurately controlled volume of fuel to the engine each cycle.
Refinement of fuel quantity control becomes therefore a matter of optimising:
- the size of the geometrically fixed volume,
- the frequency of operation of the PCI injector,
- the number of pulses required per engine cycle.
Summary
PCI technology has been demonstrated to match the emissions, performance and economy of conventinal fuel injection systems, whilst compared to carburettors shows improvements in emissions of 30-50% for HC+NOx and up to 88% CO.
The simplicity of design, control and packaging of the Pulse Count Injection solution lends itself to use on small engines in this very cost sensitive market.