This standard specifies the bench test methods for the performance of road vehicle engines, including the dynamic and economic test methods under various loads, the power test methods for no-load starting, idling and mechanical loss, and the test methods for piston leakage related to cylinder tightness and engine oil consumption, etc., all of which are used to evaluate the performance of road vehicle engines.
This standard is applicable to internal combustion engines of cars, trucks and other land vehicles, while not applicable to those of motorcycles and tractors. The internal combustion engine is of reciprocating and rotor type other than free piston type, including spark-ignition and compression-ignition engines, two-stroke and four-stroke engines, non-supercharged and supercharged engines (mechanical supercharged, turbo-charged and intercooled), water-cooled and air-cooled engines.
Type approval test on newly designed and significantly improved engines, verification test for engine produced by changing production line and quality inspection test for engine produced freshly shall be carried out in accordance with the methods specified in this standard.
This standard may also serve as technical basis for association between engine manufacturer and road vehicle manufacturer.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, all editions cited are valid. All standards are subject to revision, and all parties using this standard are encouraged to investigate the possibility of applying the latest editions of the following standards.
GB/T 1883-1989 Reciprocating internal combustion engines-terminology (eqv ISO 2710: 1978)
GB 3847-1999 Limits and measurement methods for exhaust visible pollutants from compression ignition (C.I.) engines and vehicles equipped with C.I. engines
GB 14761-1999 Limits and measurement methods for emissions of pollutants from motor vehicles
GB 17691-1999 Limits and measurement methods for exhaust pollutants from compression ignition (C.I.) engines and vehicles equipped with C.I. engines
3 Definitions
For the purposes of this standard, the following definitions apply.
All kinds of powers used in this standard are calculated from the measured engine speed and torque value under different conditions when the accelerator is at full load (i.e. floored), expressed in kW.
3.1 observed brake power
power output by the engine under the actual intake state
3.2 corrected brake power
Foreword i 1 Scope 2 Normative references 3 Definitions 4 Requirements for instrument precision and measuring position 5 Calculation of test data 6 Control of general test conditions 7 Accessories of engine during tests 8 Test methods for ten performances 9 Test report Annex A (Normative) Main parameters of spark-ignition engine Annex B (Normative) Main parameters of compression-ignition engine Annex C (Normative) Summary of test results Annex D (Normative) Permissible deviations of engine power, torque and fuel consumption rate Annex E (Informative) Humidity chart Annex F (informative) Engine characteristic curve Annex G (Informative) Engine test data records Annex H (Informative) Conversion between legal units and metric units
