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GB/T 19055-2003 English PDF (GBT19055-2003)

GB/T 19055-2003 English PDF (GBT19055-2003)

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GB/T 19055-2003: Reliability test methods for motor vehicle engines

This standard specifies the general reliability test methods of motor vehicle engines of complete vehicle on bench, including the load test specifications (such as the alternating load, mixed load and full-speed full-load), thermal shock test specifications and reliability evaluation methods. This standard is applicable to the water-cooling engines of passenger and commercial vehicles, and not applicable to the engines of motorcycle and tractor. The engine is reciprocating type and rotor type one, free piston type engine exclusive. This standard covers the spark ignition and compression ignition engines; two-stroke and four-stroke engines; non-supercharger and supercharger (mechanical supercharging and turbo supercharging, water to air and air to air inter-cooling); and is applicable to the engines fuelled with gasoline, diesel fuel, natural gas, LPG and alcohol fuel. Approval of new designed or important modified motor vehicle engines, approval of engines entrusted to manufacture and quality inspection of currently-produced engines are subject to the reliability test in accordance with the methods provided in this standard. This standard is also acted as the technical basis of exchange between the engine and.
GB/T 19055-2003
ICS 43.060.01
National Standard
of the PEOPLE Republic of China
Replacing QC/T 525-1999
Reliability Test Methods for Motor Vehicle Engines
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Table of Contents
Foreword ... 4
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test engine ... 7
5 General requirements ... 7
6 Control of general conditions ... 7
6.1 Fuel ... 7
6.2 Oil ... 7
6.3 Coolant ... 7
6.4 Prevention of abnormal combustion ... 8
7 Regulation and fixation of accessories attached to engine and all systems in case of test ... 8 7.1 Intake system ... 8
7.2 Exhaust system ... 8
7.3 Emission control device ... 8
7.4 Cooling system ... 8
7.5 Ignition system ... 8
7.6 Fuel supply system ... 8
7.7 Electrical power generating system (EPGS) ... 9
8 Work procedure ... 9
8.1 Precision measurement before test ... 9
8.2 Run-in... 9
8.3 Preliminary performance test ... 9
8.4 Reliability test ... 9
8.5 Performance retest ... 9
8.6 Dismantling ... 9
8.7 Precision measurement after test ... 10
9 Reliability test specifications ... 10
9.1 Alternating load test specifications ... 11
9.2 Mixed load test specifications ... 11
9.3 Full-speed full-load test specifications ... 12
9.4 Thermal shock test specifications ... 12
10 Inspection and maintenance ... 13
10.1 Inspection at any moment ... 13
10.2 Inspection per 1 h ... 14
10.3 Inspection and maintenance per 24 h ... 14
10.4 Inspection and maintenance per 96 h ... 14
10.5 Inspection and maintenance per 192 h ... 14
10.6 Inspection and maintenance per 504 h ... 15
10.7 Final inspection of reliability test ... 15
11 Processing of test results ... 15
11.1 Reliability of running ... 15
11.2 Stability of performance ... 15
11.3 Damage of parts and components ... 15
11.4 Wear and tear of parts and components ... 15
11.5 Surface deposits of parts and components ... 16
12 Test report ... 16
Annex A ... 17
Both of this standard and GB/T 18297-2001 Performance test code for road vehicle engines belong to the same series of national standards. And this standard is an important part of test methods of motor vehicle engines.
This standard shall replace QC/T 525-1999, from the implementation date. Annex A of this standard is normative.
This standard was proposed by China Association of Automobile Manufacturers. This standard shall be under the jurisdiction of National Automotive Standardization Technical Committee.
The drafting organization of this standard. Dongfeng Automobile Engineering Research Institute. The main drafters of this standard. Fang Dachun, Wu Xinchao, Rao Rulin, Bao Donghui, and Zhou Mingbiao.
The previous editions replaced by this standard are.
- JBn 3744-84, QC/T 525-1999.
On the basis of long time application experience of JBn 3744-84 i.e., QC/T 525-1999 Reliability Test Methods of Motor Vehicle Engines, with the reference to the state-of-the-art overseas technologies, this standard was stipulated.
Compared with QC/T 525-1999, the main technical modifications of this standard are as follows. -- Extend the scope of application of this standard. Not only is it suitable for gasoline and diesel engines; but also suitable for engines fuelled with natural gas, LPG and alcohol fuel;
-- Modify the reliability test specifications. For the vehicle engine with the max total mass of less than 3.5 t, adopt the alternating load test specifications that are more approaching to the use operating mode; for the one with max total mass of 3.5 t ?€? 12 t, adopt the mixed load test specifications to improve the lubrication state. The thermal shock test was conducted only on the compression ignition engine in the past. Now it is extended to the spark ignition engine; and it is added with ?€?Parking?€? mode, so as to increase the variation rate of temperature to which the parts and components can withstand;
-- Modify the limit of max piston air leakage at full load. First-time introduce the limit calculating formula that is suitable for non-supercharger, supercharger, supercharger inter-cooling machine at the different speed ranges, so as to make the evaluation to be more reasonable.
-- Modify the limit of oil/fuel consumption ratio (changed from 0.8% to 0.3%) at rated speed and full load, in order to enable the motor vehicle engines to meet the particulate emission limit requirements prescribed in the national emission standards;
-- List the ?€?Processing of test results?€? as an independent chapter. Require to analyze and evaluate in detail the performance stability of complete engine, damage and wear of parts and components, etc.;
-- Add Annex A Reliability evaluatio...

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