GB/T 28239-2020Limits and measurement methods for non-road diesel engine specific fuel consumption (English PDF)

1 Scope

This Standard specifies the limits and measurement methods for non-road diesel engine weighted specific fuel consumption.

This Standard is applicable to non-road diesel engines whose rated power is not greater than 560 kW (hereinafter referred to as diesel engines); the used fuel is light diesel oil, excluding marine diesel engines that use heavy oil.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB 20891-2014 Limits and Measurement Methods for Exhaust Pollutants from Diesel Engines of Non-road Mobile Machinery (China III, IV)

GB/T 21404-2008 Internal Combustion Engine - Determination and Method for the Measurement of Engine Power - General Requirements

3 Terms and Definitions

What is defined in GB/T 21404 and GB 20891, and the following terms and definitions are applicable to this document.

6 Diesel Engine Lineage and Source Engine

The definition of diesel engine lineage and source engine is shown in 3.8 and 3.9 of GB 20891-2014. The determination of parameters of diesel engine lineage and source engine selection are respectively shown in Chapter 8 and Chapter 9 of GB 20891-2014.

7 Limits of Weighted Specific Fuel Consumption

In accordance with the rated power, the limits of weighted specific fuel consumption of diesel engine are divided into 10 gears. The manufacturer may choose to limit the diesel engine lineage to one power gear and verify the weighted specific fuel consumption of the power gear of diesel engine lineage. In the same lineage, it is allowed to select a representative model as the source engine for measurement and assessment.

The limits of non-road diesel engine weighted specific fuel consumption are shown in Table 1. The limits of air-cooled diesel engine and condensing diesel engine are allowed to increase by 4%. Before the measurement of the specific fuel consumption, the diesel engine is allowed to run-in in accordance with the manufacturer's regulations.

All limits are the limits under the standard reference conditions specified in Chapter 5 of GB/T 21404-2008. During the measurement of non-road diesel engine rated power (total power), the equipment and auxiliary devices that shall be installed shall comply with the stipulations of Appendix A.

8 Idling Speed 0

Atmospheric Conditions Pressure: Fuel Designation Participant Model: No.: Dry Temperature: Engine Oil Designation No.: Power Formula: Relative Humidity: Location of Test Purpose: Atmospheric Factor: Record: Applicable Test Cycle: Proofreading:

Test Item Operating Condition Speed Dynamo-meter Reading Power Torque Amount of Fuel Consumption Specific Fuel Consumption Air Intake Air Exhaust Engine Oil Cooling Water Temperature Actual Measure Actual Measure Mass Consumption Time Hourly Fuel Consumption Actual Measure Temperature Temperature Pressure Temperature In Out r/min N kW N-m g s g/h g/(kW-h) °C °C kPa °C °C °C Rated 1 Rated 100%

8.1.5 In accordance with the purpose of diesel engine, determine the applicable test cycle. In addition, in accordance with the rated power, rated speed, maximum torque and the speed of the diesel engine, determine the power, torque and speed of each operating condition in the corresponding test cycle.

8.1.6 After the operating condition of each test cycle reaches the steady state specified by the manufacturer, measure the power / torque, speed, specific fuel consumption per hour and intake air temperature at least twice. In addition, take the average value as the measured value of the operating condition; the torque does not exceed ±2% of the maximum torque at the test speed; the speed does not exceed 1% or ± 10 r/min; the difference between the two measured values of specific fuel consumption per hour does not exceed 2%.

8.1.7 The fuel used for the test is consistent with the fuel used for the four-stage emission measurement specified in the currently valid GB 20891-2014. If it is another designation (calorific value) of diesel, in accordance with Formula (2), convert the weighted specific fuel consumption. The engine oil used for the test is the engine oil specified by the diesel engine manufacturer and is indicated in the test report.

8.1.8 During the test, the temperature of the cooling medium and engine oil shall comply with the stipulations of 6.3.4.10 and 6.3.4.12 in GB/T 21404-2008.

8.1.9 When the laboratory air intake system is used, the air intake resistance under the calibrated operating condition shall be within 110% of the upper limit specified by the manufacturer. When the laboratory exhaust system is used, the difference between the back pressure under the calibrated operating condition and the upper limit specified by the manufacturer shall not exceed 1 kPa.

8.1.10 During the test, the fuel temperature shall comply with the stipulations of B.2.7 in GB 20891-2014. The fuel temperature at the inlet of the fuel injection pump shall be 306 K ~ 316 K (33 °C ~ 43 °C), or, comply with the manufacturer's stipulations.

8.1.11 Adopt the mass method to measure the specific fuel consumption. When using a manual instrument for measurement, the duration of measurement shall be not less than 60 s; when using an automatic instrument for measurement, the duration of measurement shall be not less than 30 s.

Appendix B (Normative) A Description of Characteristics of Diesel Engine Lineage Source Engine

B.1 A Description of Diesel Engine

Appendix D (Informative)

Table of Test Record for Test Cycle of 8 Operating Conditions When testing and measuring the weighted specific fuel consumption of non-road diesel engine under 8 operating conditions, use Table D.1 for recording.

Table D.1 -- Table of Test Record of Weighted Specific Fuel Consumption of Non-road Diesel Engine (for 8 operating conditions) Diesel Engine Manufacturer: Dynamo-meter Model:

Atmospheric Conditions Pressure: Fuel Designation Participant Model: No.: Dry Temperature: Engine Oil Designation No.: Power Formula: Relative Humidity: Location of Test Purpose: Atmospheric Factor: Record: Applicable Test Cycle: Proofreading: Intermediate Speed (r/min):

Test Item Operating Condition Speed Dynamo-meter Reading Power Torque Amount of Fuel Consumption Specific Fuel Consumption Air Intake Air Exhaust Engine Oil Cooling Water Temperature Actual Measure Actual Measure Mass Consumption Time Hourly Fuel Consumption Actual Measure Temperature Temperature Pressure Temperature In Out r/min N kW N-m g s g/h g/(kW-h) °C °C kPa °C °C °C Rated 1 Rated 100% Speed/ Rated Power Torque Speed Ttq Average Value 2 75% Average Value 3 50% Average Value 4 10% Average Value Inter-mediate/ Maxi- Torque Tmtq Inter-mediate Speed 100% Tmtq Average Value 6 75% Tmtq Average Value 7 50% Tmtq Average Value

Appendix G (Informative)

Table of Test Record for Test Cycle of 4 Variable-speed Operating Conditions When testing and measuring the weighted specific fuel consumption of non-road diesel engine under 4 variable-speed operating conditions, use Table G.1 for recording.

Table G.1 -- Table of Test Record of Weighted Specific Fuel Consumption of Non-road Diesel Engine (for 4 variable-speed operating conditions) Diesel Engine Manufacturer: Dynamo-meter Model:

Atmospheric Conditions Pressure: Fuel Designation Participant Model: No.: Dry Temperature: Engine Oil Designation No.: Power Formula: Relative Humidity: Location of Test Purpose: Atmospheric Factor: Record: Applicable Test Cycle: Proofreading: Intermediate Speed (r/min): Test Item Operating Condition Rated Speed (r/min) Dynamo-meter Reading Power / Rated Power (kW)

Torque Amount of Fuel Consumption Specific Fuel Consumption Air Intake Air Exhaust Engine Oil Cooling Water Temperature Mass Consumption Time Hourly Fuel Consumption Actual Measure Temperature Temperature Pressure Temperature In Out % N % N-m g s g/h g/(kW-h) °C °C kPa °C °C °C […]