【国外标准】 Standard Test Method for Evaluation of Automotive Engine Oils for Inhibition of Deposit Formation in the Sequence VH Spark-Ignition Engine Fueled with Gasoline and Operated Under Low-Temperature, Light-Duty Conditions

5.1 This test method is used to evaluate an automotive engine oil's control of engine deposits under operating conditions deliberately selected to accelerate deposit formation. This VH test method was correlated with the previous VG test method, which was correlated with field service data, determined from side-by-side comparisons of two or more oils in police, taxi fleets, and delivery van services.5.2 This test method, along with other test methods are used to define an engine oils minimum performance level necessary to meet certification requirements for API Category Specifications as outlined in Specification D4485. This test method may also be incorporated in automobile manufacturers’ factory–fill specifications.5.3 The basic engine used in this test method is representative of many that are in modern automobiles. This factor, along with the accelerated operating conditions, should be considered when interpreting test results.1.1 This test method is commonly referred to as the Sequence VH test, and it has been correlated with the Sequence VG test. The Sequence VG test was previously correlated with vehicles used in stop-and-go service prior to 1996, particularly with regard to sludge and varnish formation.3 It is one of the test methods required to evaluate oils intended to satisfy the API SN, SN Plus performance category.1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.1.2.1 Exception—Where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing size, or specified single source equipment.1.3 A table of contents follows:  Section 1Referenced Documents 2Terminology 3Summary of Test Method 4 5Apparatus (General Description) 6Apparatus (The Test Engine) 7Sequence VH Test Engine 7.1Required New Engine Parts 7.2Reusable Engine Parts 7.3Specially Fabricated Engine Parts 7.4Special Engine Measurement and Assembly Equipment 7.5Miscellaneous Engine Components—Preparation 7.6Solvents and Cleaners Required 7.7Assembling the Test Engine—Preparations 7.8Assembling the Test Engine—Installations 7.9Engine Installation on the Test Stand 7.10Engine Fluids (Supply/Discharge Systems) 8Intake Air 8.1Fuel and Fuel System 8.2Engine Oil and Engine Oil System 8.3Coolants 8.4Measurement Instrumentation 9Temperatures 9.1Pressures 9.2Flow Rates 9.3Fuel Consumption 9.4Speed and Torque 9.5Exhaust Gas 9.6Humidity 9.7Miscellaneous Laboratory Equipment 10Test Stand Calibration 11Test Procedure 12Pre-Test Procedure 12.1Engine Operating Procedure 12.2Periodic Measurements and Functions 12.3Special Maintenance Procedures 12.4Diagnostic Data Review 12.5End of Test Procedure 12.6Interpretation of Test Results 13Parts Rating Area—Environment 13.1Sludge Ratings 13.2Varnish Ratings 13.3Clogging 13.4Sticking 13.5Used Oil Analyses 13.6Assessment of Test Validity 14General 14.1Used Oil Analyses—Interpretation 14.2Blowby Flow Rate 14.3Manifold Absolute Pressure (MAP) 14.4Fuel Consumption Rate 14.5Oil Consumption 14.6Engine Parts Replacement 14.7Quality Index 14.8Final Test Report 15Report Forms 15.1Precision and Bias 16Keywords 17ANNEXES  ASTM TMC: Organization Annex A1ASTM TMC: Calibration Procedures Annex A2ASTM TMC: Maintenance Activities Annex A3ASTM TMC: Related Information Annex A4Safety Precautions Annex A5Control and Data Acquisition Requirements Annex A6Detailed Specifications and Photographs of Apparatus Annex A7Test Engine Part Number, Classification, and Usage Guidelines Annex A8External Oil Heat Exchanger Cleaning Technique Annex A9Sequence VH Report Forms and Data Dictionary Annex A10Dipstick Calibration Annex A11Critical Part Supplier List Annex A12Operational Data Log—Engine Oil Annex A13Rating Worksheets Annex A14Fuel Injector Flow Measurements Annex A15APPENDIXES  Piston and Ring Measurements Record Forms Appendix X1Sources of Materials and Information Appendix X21.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in 7.7, 7.7.1, 7.7.2, 7.7.3, 7.7.4, 7.7.5, A5.3.4, and A5.3.5.5.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.