Dual-Injection Fuel Delivery System

DUAL-INJECTION FUEL DELIVERY SYSTEM

Overview
The dual-injection fuel delivery system consists of a fuel select switch (FSSW) circuit, the fuel rails, the fuel injectors, and a fuel injector interface module.

The fuel injector interface module controls the fuel injectors according to the demand from the powertrain control module (PCM). The fuel injector interface module enables the primary (forward) fuel injectors when in single-injection mode and enables both the primary (forward) and secondary (rearward) fuel injectors when in dual-injection mode. The injection mode is requested by the PCM through the FSSW circuit. The fuel injector interface module communicates the fuel injection mode status to the PCM on the communications network.

Fuel Select Switch (FSSW) Circuit
The FSSW circuit is used by the PCM to toggle between single-injection and dual-injection fuel modes. When torque demand reaches a calibrated limit the PCM requests the secondary injectors by toggling the FSSW circuit.

Fuel Rails

Dual-injection Fuel Rail:

The fuel rails route fuel to both fuel injectors.

Fuel Injectors

Primary And Secondary Injectors:

The dual-injection fuel delivery system uses 2 injectors per cylinder paired together. The primary injectors are slightly forward of the secondary injectors.

Fuel Injector Interface Module
The fuel injector interface module is used to control the dual-injection fuel delivery system for gasoline engines. Based on an input from the PCM the fuel injector interface module controls either single or dual-injection modes.