This SAE Recommended Practice promotes uniformity in the evaluation and qualification tests conducted on fuel injectors used in gasoline engine applications. Its scope is limited to electronically actuated fuel injection devices used in automotive port or throttle body fuel injection systems where fuel supply pressure is below 1000 kPa. It is primarily restricted to bench tests. More specifically, this document is intended for use as a guide to the following:

Standardize use of nomenclature specifically related to fuel injectors.

Identify and define those parameters that are used to measure fuel injector characteristics or performance. The parameters included in this document are listed along with their recommended symbol where appropriate:

Closing Time (CT)

Inductance (L)

Coil Resistance (R)

Dynamic Flow (Qd)

Dynamic Flow Calculated (Qdc)

Dynamic Flow Rate (Q)

Dynamic Flow Temperature Shift (Qtd)

Dynamic Flow Vacuum Shift (Qvd)

Dynamic Minimum Operating Voltage (DMOV)

Dynamic Set Point (PWxx)

Dynamic Set Point Flow (Qsp)

External Leakage

Flow-Offset (Y)

Insulation Resistance (IR)

Linear Flow Range (LFR)

Linearity Deviation (LD)

Maximum Overload Voltage

Opening Time (OT)

Operating Voltage Range

Period (P)

Pulse Width (PW)

Pressure Drop Ratio (PDR)

Repeatability

Slope (m)

Slope Approximated (ma)

Spray Pattern

Stability (S)

Static Drop-Out Current (I/S-OFF)

Static Flow Rate (Qs)

Static Minimum Operating Voltage (SMOV)

Static Pull-In Current (I/S-ON)

Time-Offset (X)

Working Flow Range (WFR)

Establish test procedures and recommend test equipment and methods to measure and quantify these parameters.

Establish test procedures, and recommend test equipment and methods to quantify simulated field reliability over the life of the component.

Except where stated, test results are recorded for individual parts under recommended test conditions. Where population characteristics are reported, the sample size, selection method, and analysis technique must be explicitly stated.

Any testing practices which are different than those recommended in this specification should be noted on the data collection sheet.

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