1、Test ProcedureRoad GME8714Tank Vent System and Fuel Smell PreventionNote: This specification may be applied only for current projects incl. Global Epsilon (37#). It isSuperceded for all future projects and replaced by GMW15017, GMW14509 and GMW14880.1 IntroductionNote: Nothinginthisstandardsupersede
2、sapplicablelaws and regulations.Note: In the event of a conflict between the Eng-lish and the domesticlanguage, the English languageshall take precedence.1.1 Purpose. The purpose of this specification is toevaluate the Venting System as follows:Static Venting under gradingDynamic VentingFuel Smell P
3、revention1.2 Foreword. Not applicable.1.3 Applicability. Gasoline and diesel passengercars.1.4 Definitions.LiquidCarryOver: Amountof liquid fuel leakingofthe vent system that can reach the carbon canister.Fuel Smell: Perceptible fuel vaporization insideand outside the vehicle (when storage capacity
4、ofCarbon Canister is exhausted).ECE: Urban Driving Cycle for European Union.EUDC: Extra Urban Driving Cycle for EuropeanUnion.2 ReferencesNote: Only the latest approved standards are appli-cable unless otherwise specified.2.1 External Standards/Specifications. None.2.2 GM Group Standards/Specificati
5、ons.GME87133 Resources3.1 Facilities.3.1.1 General.3.1.1.1 Testing shall be performed at a facility free ofignition sources.3.1.1.2 If indoors, the test facility shall be an explo-sion proof room with adequate ventilation to meet alllocal safety codes.3.1.2 Dynamic Venting.3.1.2.1 Facility with a ci
6、rcular lap, a straight course(1 km length, 10 m min. width, turning points), a skidpad (diameter 60 m), a course with Belgian blocks(2 km length) and a ride measure weight andrecord as Starting Weight.c Drive ECE plus two times EUDC at the test bench.d Measure weight of canister after ECE as Weighta
7、fter ECE.e Measure weight of canister after the entire test asWeight after test.f Calculate Test Bench Canister Regeneration =Weight after test - Starting Weight Copyright 2007 General Motors Corporation All Rights ReservedMay 2007 - Issue No. 2 Page 3 of 5PRD045 - VPRE ST U 10/03GME8714 GM EUROPE E
8、NGINEERING STANDARDSECE Canister Regeneration = Weight after ECE- Starting WeightEUDC Canister Regeneration = Weight after test- Weight after ECE4.3.3.2 Fuel Smell Prevention during City Traffic.Ambient temperature shall be +38 C.Note: The measured fuel vapor pressure shall bereduced/increased by 13
9、 hPa per 1 C that the ambi-ent temperature is above/below +38 C.Fuelsmellrating isby closedwindows, climateonandventilate is on.a Install equipment to measure pressure in tank,ambient temperature, temperature in tank (5 %tank capacity) and temperature into Carbon Can-ister.b Fill tank using Customer
10、 Fill Method (seeGME8713).c Drive vehicle for 50 km at 100 km/h, on a suitablegear (“normal customer usage”, automatic trans-mission in “D”).d Drive City Cycle (7.5 km plus 10 min soak) 5 times(see Figure 3).e Drive vehicle for 50 km at 100 km/h, on a suitablegear (“normal customer usage”, automatic
11、 trans-mission in “D”).f Record if there is a canister break through or anyfuel smell in the passenger compartment.5 Data5.1 Calculations. If required.5.2 Interpretation of Results. To evaluate if resultsare in accordance with requirements in specification(SSTS).5.3 Test Documentation. Record pertin
12、ent testresults on the supplied data sheet. The test resultsshall be added to a test report with referencen to thisTest Procedure.6 SafetyThisstandardmayinvolvehazardousmaterials, oper-ations and equipment. This standard does not pro-poseto adressallthesafetyproblemsassociatedwithits use. It is the
13、responsibility of user of this stan-dard to establish appropriate safety and health prac-tices and determine the applicability of regulatory lim-itations prior to use.7 Coding SystemThis standard shall be called up in other documents,drawings, VTS, CTS etc. as follows:Example: “GME8714”8 Release and
14、 Revisions8.1 Release. This standard was first approved andreleased on 18/JUL/2005.This standard was first approved by Saab on18/JUL/2005.Content Owner: ITDC PE Thermal and Fuel Systems/ Saab Th CTS 302: City Cycles) Copyright 2007 General Motors Corporation All Rights ReservedMay 2007 - Issue No. 2 Page 5 of 5PRD045 - VPRE ST U 10/03
