GB/T 19055-2024 Reliability test methods for motor vehicle engines
1 Scope
This document specifies the general reliability test methods and reliability assessment methods for the bench test of motor vehicle engines.
This document is applicable to Categories M and N motor vehicle engines, which are reciprocating or rotor engines other than free-piston engines.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1883.1 Reciprocating internal combustion engines－ Vocabulary - Part 1: Terms for engine design and operation
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 17754 Tribology terminology
GB/T 18297 Performance test code for road vehicle engines
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 15089, GB/T 1883.1, GB/T 17754 and GB/T 18297 as well as the following apply.
3.1
rated speed
speed of the engine at rated power
Note: The rated power is specified by the manufacturer, and the rated speed is generally lower than the speed of maximum power under full load.
3.2
speed of maximum net torque
nM
speed of the engine when the maximum effective torque is output and the engine is equipped with a full set of vehicle accessories according to GB/T 18297
3.3
rated net power
corrected brake power output at rated speed under full load when the engine is equipped with a full set of vehicle accessories according to GB/T 18297
4 Test engines
The three test engines (numbered as A, B, and C), shall meet the product technical standards of the engine manufacturer.
5 General requirements for tests
The precision of the test instruments, the measuring part, and the calculation of the test data shall comply with the requirements of GB/T 18297.
6 Control of general test conditions
6.1 Inlet state
The inlet temperature should be at 25°C±10°C.
6.2 Fuel
Fuel grades shall be as specified by the engine manufacturer. The gasoline temperature shall be at 25°C±5°C, the diesel temperature shall be at 40°C±5°C, and the temperature of other fuels shall be as specified by the engine manufacturer.
The fuel pressure shall be as specified by the engine manufacturer.
6.3 Engine oil
The engine oil grade shall be as specified by the engine manufacturer. The engine oil temperature shall not exceed the allowable temperature specified by the engine manufacturer; otherwise, the forced cooling device shall be adopted.
6.4 Coolant
The coolant used shall be as specified by the engine manufacturer. The outlet coolant temperature shall be at 95°C±3°C or the temperature specified by the engine manufacturer; during the thermal shock test, the coolant temperature shall meet those specified in Table 5.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test engines
5 General requirements for tests
6 Control of general test conditions
7 Adjustments of accessories and systems on the engine during tests
8 Working procedures
9 Reliability test specification
10 Recommended inspection and maintenance
11 Evaluation of test results
12 Test report
Annex A (Normative) Reliability assessment methods for motor vehicle engines
