National Standard of the People’s Republic of China Reliability Running Test Method For Automobiles GB/T 12678-1990 1 Subject contents and scope of applicability This standard specifies the reliability running test method for automobiles. This standard is applicable to the reliability running test plete vehicle during type approval and quality evaluation of various automobiles. 2 Reference to standards GB7031 Vehicle vibration: Describing method for road surface irregularity GB/T 12534 Motor vehicles - General rules of road test method 3 Terms Routine reliability test Reliability test performed according to a standard under the conditions of highway and normal road. Quick reliability test Reliability test perform on the roads of the testing field with certain quick coefficient. Maintenance after failure Repair performed after the automobile has failure. Preventive maintenance Repair and maintenance performed according to the cycle and items specified by the automobile manual. Potential failure Failure that has occurred, but not yet discovered, or discovered in the process of preventive maintenance and overhaul inspection. Equivalent failure number The number of general failures converted from failures at various levels with certain coefficient according to their hazardness. 4 Testing conditions Loading quality The loading quality is specified according to Article 1 of Chapter 3 in GB/T12534. Testing roads Routine reliability testing road Routine reliability testing road surface levels are according to the specificationsin Table 1 of GB7031. Plain road Road on plains and rolling terrains with the road surface smoothness of Level C or above, maximum gradient less than 5%, where the road surface is wide and straight,with good range of vision, and the automobile can keep driving at a high speed for a driving distance of more than 50km. Bad road Road with firm roadbed and uneven r