Значение и использование

Test Method—The data obtained from the use of this test method provide a comparative index of the fuel-saving capabilities of automotive engine oils under repeatable laboratory conditions. A baseline calibration oil (hereafter referred to as BC oil) has been established for this test to provide a standard against which all other oils can be compared. The BC oil is an SAE 5W-30 grade fully formulated lubricant. There is a direct correlation of Test Method D6837 (Sequence VIB) Fuel Economy Improvement (FEI) by percent with the fuel economy results obtained from vehicles representative of current production running under the current EPA testing cycles. The test procedure was not designed to give a precise estimate of the difference between two test oils without adequate replication. Rather, it was developed to compare a test oil to BC oil. Companion test methods used to evaluate engine oil performance for specification requirements are discussed in the latest revision of Specification D4485.

Use—The Sequence VIB test method is useful for engine oil fuel economy specification acceptance. It is used in specifications and classifications of engine lubricating oils, such as the following:

Specification D4485.

API Publication 1509.

SAE Classification J304.

SAE Classification J1423.

Область применения

1.1 This test method covers an engine test procedure for the measurement of the effects of automotive engine oils on the fuel economy of passenger cars and light-duty trucks with gross vehicle weight of 3856 kg or less. The tests are conducted on a dynamometer test stand using a specified spark-ignition engine with a displacement of 4.6-L. It applies to multiviscosity grade oils used in these applications.

1.2 This test method also provides for the running of an abbreviated length test that is referred to as the VIBSJ. The procedure for VIBSJ is identical to the Sequence VIB with the exception of the items specifically listed in Annex A13. The procedure modifications listed in Annex A13 refer to the corresponding section of the Sequence VIB test method.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3.1 Exceptions—Where there is no direct SI equivalent such as screw threads, National Pipe Threads/diameters, tubing size, or single source supply equipment specifications. Brake Specific Fuel Consumption is measured in kilograms per kilowatthour. In Figs. A2.4, A2.5, and A2.8, inch-pound units are to be regarded as standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.5 This test method is arranged as follows:

SubjectSection Introduction Scope1 Referenced Documents2 Terminology3 Summary of Test Method4 Significance and Use5 Apparatus6 General6.1 Test Engine Configuration6.2 Laboratory Ambient Conditions6.3 Engine Speed and Torque Control6.4 Dynamometer6.4.1 Dynamometer Torque6.4.2 Engine Cooling System6.5 External Oil System6.6 Fuel System6.7 Fuel Flow Measurement6.7.2 Fuel Temperature and Pressure Control to
the Fuel Flowmeter6.7.3 Fuel Temperature and Pressure Control to
Engine Fuel Rail6.7.4 Fuel Supply Pumps6.7.5 Fuel Filtering6.7.6 Engine Intake Air Supply6.8 Intake Air Humidity6.8.1 Intake Air Filtration6.8.2 Intake Air Pressure Relief6.8.3 Temperature Measurement6.9 Thermocouple Location6.9.5 AFR Determination6.10 Exhaust and Exhaust Back Pressure Systems6.11 Exhaust Manifolds6.11.1 Laboratory Exhaust System6.11.2 Exhaust Back Pressure6.11.3 Pressure Measurement and Pressure Sensor
Locations6.12 Engine Oil6.12.2 Fuel to Fuel Flowmeter6.12.3 Fuel to Engine Fuel Rail6.12.4 Exhaust Back Pressure6.12.5 Intake Air6.12.6 Intake Manifold Vacuum/Absolute Pressure6.12.7 Coolant Flow Differential Pressure6.12.8 Crankcase Pressure6.12.9 Engine Hardware and Related Apparatus6.13 Test Engine Configuration6.13.1 ECM/EEC (Engine Control) Module6.13.2 Thermostat/Orifice Plate6.13.3 Intake Manifold6.13.4 Flywheel6.13.5 Wiring Harnesses6.13.6 EGR Block-Off Plate6.13.7 Oil Pan6.13.8 Oil Pump Screen and Pickup Tube6.13.9 Idle Speed Control Solenoid (ISC) Block-Off
Plate6.13.10 Engine Water Pump6.13.11 Thermostat Housing6.13.12 Oil Filter Adapter6.13.13 Fuel Rail6.13.14 Miscellaneous Apparatus Related to Engine
Operation6.14 Timing Light6.14.1 Reagents and Materials7 Engine Oil7.1 Test Fuel7.2 Engine Coolant7.3 Cleaning Materials7.4 Preparation of Apparatus8 Test Stand Preparation8.2 Engine Preparation9 Cleaning of Engine Parts9.2 Engine Assembly Procedure9.3 General Assembly Instructions9.3.1 Bolt Torque Specifications9.3.2 Sealing Compounds9.3.3 Harmonic Balancer9.3.5 Oil Pan9.3.6 Intake Manifold9.3.7 Camshaft Covers9.3.8 Thermostat9.3.9 Thermostat Housing9.3.10 Coolant Inlet9.3.11 Oil Filter Adapter9.3.12 Dipstick Tube9.3.13 Water Pump9.3.14 Sensors, Switches, Valves, and Positioners9.3.15 Ignition System9.3.16 Fuel Injection System9.3.17 Intake Air System9.3.18 Engine Management System (Spark and Fuel
Control)9.3.19 Accessory Drive Units9.3.20 Exhaust Manifolds9.3.21 Engine Flywheel and Guards9.3.22 Lifting of Assembled Engines9.3.23 Engine Mounts9.3.24 Calibration10 Stand/Engine Calibration10.1 Procedure10.1.1 Reporting of Reference Results10.1.2 Analysis of Reference/Calibration Oils10.1.3 Instrument Calibration10.2 Engine Torque Measurement System10.2.1 Fuel Flow Measurement System10.2.2 Coolant Flow Measurement System10.2.3 Thermocouple and Temperature Measurement
System10.2.4 Humidity Measurement System10.2.5 Other Instrumentation10.2.6 Test Procedure11 Preparation for Initial Start-up of New Engine11.1 External Oil System11.1.1 Flush Effectiveness Demonstration11.1.2 Preparation for Oil Charge11.1.3 Oil Charge for Coolant Flush11.1.4 Engine Coolant Charge for Coolant Flush11.1.5 Initial Engine Start-up11.2 Coolant Flush11.3 New Engine Break-In11.4 Oil Charge for Break-In11.4.2 Break-In Operating Conditions11.4.3 Routine Test Operation11.5 Start-Up and Shutdown Procedures11.5.8 Flying Flush Oil Exchange Procedures11.5.9 Test Operating Stages11.5.10 Stabilization to Stage Conditions11.5.11 Stabilized BSFC Measurement Cycle11.5.12 Data Logging11.5.13 BC Oil Flush Procedure for BC Oil Before Test
Oil11.5.14 BSFC Measurement of BC Oil Before Test Oil11.5.15 Test Oil Flush Procedure11.5.16 Test Oil Aging11.5.17 BSFC Measurement of Aged (Phase I) Test Oil11.5.18 Aging Phase II11.5.19 BSFC Measurement of Aged (Phase II) Test Oil11.5.21 BC Oil Flush Procedure for BC Oil After Test Oil11.5.22 BSFC Measurement for BC Oil After Test Oil11.5.23 General Test Data Logging Forms11.5.24 Diagnostic Review Procedures11.5.25 Determination of Test Results12 FEI1 and FEI2 Calculations12.1 Final Test Report13 Validity Statement13.1 Report Format13.2 Precision and Bias15 Precision15.1 Validity15.2 Test Stand Calibration Status15.2.1 Validity Interpretation of Deviant Operational
Conditions15.2.2 Bias15.3 Keywords16 Annexes Role of ASTM TMCAnnex A1 Detailed Specifications and Drawings of ApparatusAnnex A2 Oil Heater Cerrobase Refill ProcedureAnnex A3 Engine Part Number ListingAnnex A4 Flying Flush ChecklistsAnnex A5 Safety PrecautionsAnnex A6 Report FormatAnnex A7 Statistical Equations for Mean and Standard
DeviationsAnnex A8 Oil Sump Full Level Determination Consumption
Measurement Calibration ProcedureAnnex A9 Fuel Injector EvaluationAnnex A10 Pre-test Maintenance ChecklistAnnex A11 Blow-by Ventilation System RequirementsAnnex A12 VIBSJ Abbreviated Length Test RequirementsAnnex A13 Appendix Procurement of Test MaterialsAppendix X1