GB/T 18297-2024 Performance test code for road vehicle engines
1 Scope
This document describes the bench test method for testing the performance of road vehicle engines, which is used to evaluate the performance of road vehicle engines.
This document is applicable to gasoline and diesel engines used in Categories M and N vehicles. The engines are of reciprocating and rotor type other than free piston type.
This standard may serve as a reference for vehicles using other types of fuels.
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1883.1, GB/T 15089, and the following apply.
3.1
observed brake power
power output by the engine under the actual intake state[1) All kinds of powers used in this document 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.]1)
3.2
corrected brake power
observed brake power having been corrected to the standard intake state
3.3
net power
power measured at the end of the engine crankshaft or its equivalent parts at the corresponding speed and corrected according to the standard inlet state when the engine is tested with a complete set of accessories
Note: The complete set of accessories refers to all accessories that are consistent with the vehicle state and serve the engine body according to the provisions of Clause 7.
3.4
gross power
power measured at the end of the engine crankshaft or its equivalent parts at the corresponding speed and corrected according to the standard inlet state when the engine is tested with only the necessary accessories to maintain operation
3.5
rated power
total power output by the engine at rated speed, as specified by the manufacturer according to the specific purpose of the engine
3.6
gaseous pollutants concentration
volume fractions of carbon monoxide (CO), nitrogen oxides (NOx), and total hydrocarbons (THC) in engine exhaust
Note: The volume fraction of carbon monoxide (CO) is measured using the non-dispersive infrared absorption method.
The volume fraction of nitrogen oxides (NOx) is measured using chemiluminescence or non-dispersive ultraviolet absorption methods.
The total hydrocarbon (THC) volume fraction is measured using either the heated flame ionization method (for diesel fuel) or the flame ionization method (for non-diesel fuel).
3.7
oil dilution ratio
ratio of the amount of incompletely burned fuel mixed with the engine oil to the total amount of the engine oil when the engine is in operation
4 Requirements for measurement errors and positions
4.1 Torque
The torque measurement error shall not exceed ±1% of the maximum torque value of the measured engine.
4.2 Speed
The speed measurement error shall not exceed ±0.5% of the measured value.
4.3 Fuel consumption
The measurement error of fuel consumption shall not exceed ±1% of the measured value.
5 Calculation of test data
6 Control of general test conditions
7 Accessories of the engine during the test
8 Test method 12 performances
9 Test report
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for measurement errors and positions
Annex A (Nominative) Summary of test results
Annex B (Informative) Schematic diagram of engine characteristic curve
Annex C (Nominative) Permissible deviations in engine power, torque, and fuel consumption rate
Annex D (Normative) Main parameters of spark ignition engines
Annex E (Normative) Main parameters of compression ignition engines
Annex F (Informative) Engine test data record
