Small and medium power diesel engines - Evaluation of reliability
1 Scope
This standard specifies the evaluation method, bench test method, failure classification and judgment rules for reliability test of small and medium power diesel engines.
This standard is applicable to the reliability test and evaluation of mass-produced small and medium power diesel engines (hereinafter referred to as “diesel engines”).
2 Normative references
The following referenced documents are indispensable for the application 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 1147.1 Small and medium power internal combustion engines - Part 1: General requirements
GB/T 1147.2-2007 Small and medium power internal combustion engines - Part 2: Test methods
GB/T 8190.4-2010 Reciprocating internal combustion engines - Exhaust emission measurement - Part 4: Steady-state test cycles for different engine applications
GB/T 21404-2008 Internal combustion engine - Determination and method for the measurement of engine power - General requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
mean time to first failure
MTTFF
mean accumulated working time when the diesel engine fails for the first time, in hours (h)
3.2
mean time between failures
MTBF
mean working time between two adjacent failures, in hours (h)
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Evaluation method 4.1 Reliability test indexes 4.2 Reliability test target value 5 Bench test method 5.1 Test prototypes 5.2 Test conditions 5.3 Test items 6 Judgment rules 6.1 Failure classification 6.2 Failure determination 7 Test report Annex A (Normative) Classification of failure modes for small and medium power diesel engines Annex B (Informative) Sampling table for reliability test Annex C (Informative) List of engine test equipment and apparatus Annex D (Informative) Summary of performance test results for engines Annex E (Informative) Record form for failures of reliability test Table 1 Diesel engine operating under characteristic speed conditions Table 2 Diesel engine operating under characteristic load conditions Table 3 Diesel engine operating under characteristic propulsion conditions Table 4 Maintenance cycle and content of diesel engine
