Road vehicles

BS ISO 1585:2020 pdf free.Road vehicles – Engine test code – Net power.
5.3.1 The net power test shall consist of a run at full throttle for spark-ignition engines and at the fixed full-load fuel injection pump setting for compression-ignition engines, the engine being equipped as specified in Table L
5.3.2 Performance data shall be obtained under stabilized operating conditions, with an adequate fresh air supply to the engine.
Engines shall have been run-in, started and warmed up in accordance with the manufacturer’s recommendations. Combustion chambers may contain deposits, but in limited quantity. Test conditions such as inlet air temperature shall be selected as near to reference conditions (see 62) as possible in order to minimise the correction factor.
5.3.3 The temperature of the inlet air to the engine (ambient air), shall be measured within 0,15 m upstream of the air inlet duct work
The thermometer or thermocouple shall be shielded from radiant heat and located directly in the airstream. It shall also be shielded from fuel spray back. A sufficient number of locations shall be used to give a representative average inlet temperature.
5.3.4 The inlet depression shall be measured downstream of the entry ducts, air filter, inlet silencer, speed-limiting device (ilthey are fitted) or their equivalents.
5.3.5 The absolute pressure at the entry to the engine, downstream of the compressor and heat exchanger, if they are fitted, shall be measured in the inlet manifold and at any other point where pressure has to be measured to calculate correction factors.
5.3.6 The exhaust back pressure shall be measured at a point at least three pipe diameters from the outlet flange(s) of the exhaust manifold(s) and downstream of the turbocharger(s), if fitted. The location shall be specified.
5.3.7 No data shall be taken until torque, speed and temperature have been maintained substantially constant for at least 1 mm.
5.3.8 The engine speed during a run or reading shall not deviate from the selected speed by more than ii % or ±10 min1, whichever is greater.
5.3.9 Observed brake load, fuel how and inlet air temperature data shall be taken virtually simultaneously and shall, in each case, be the average of two stabilized consecutive readings which do not vary more than 2 % for the brake load and fuel consumption. The second reading shall be determined without any adjustment of the engine, approximately 1 mm after the first.
5.3.10 The coolant temperature at the engine outlet shall be kept within ±5 K of the upper thermostatically controlled temperature specified by the manufacturer. If no temperature is specified. the temperature shall be 353 K ± 5 K.
For air-cooled engines, the temperature at a point indicated by the manufacturer shall be kept within
20 K of the maximum value specified by the manufacturer in the reference conditions.
5.3.11 Fuel temperature shall be as follows:
a) For spark-ignition engines, the fuel temperature shall be measured as near as possible to the inlet of the carburettor or assembly of fuel injectors. Fuel temperature shall be maintained within ±5 K of the temperature specified by the manufacturer. However, the minimum test fuel temperature allowed shall be the ambient air temperature. If the test fuel temperature is not specified by the manufacturer, it shall be 298 K ± 5 K;
b) For compression-ignition engines, the fuel temperature shall be measured at the inlet to the fuelinjection pump. At the manufacturers request the fuel temperature measurement can be made at another point in the pump representative of the engine operating condition. Fuel temperature shall be maintained within ±3 K of the temperature specified by the manufacturer. In all cases, the minimum allowable fuel temperature at the pump entrance is 303 K. If the test fuel temperature Is not specified by the manufacturer, it shall be 313 K ± 3 K.
5.3.12 The lubricant temperature shall be measured at the oil gallery inlet or the cooler outlet if fitted, unless some other measuring location is specified by the manufacturer. The temperature shall be maintained within the limits specified by the manufacturer.
5.3.13 An auxiliary regulation system may be used if necessary to maintain temperature within limits specified in 5.3.10. 5.3.11 and 5.3.12.
5.3.14 It is recommended that a reference fuel is used; for example a non-exhaustive list of such fuel
includes the following:
— CEC RF-01-A-80;
— CEC RF-08-A-85;
— CEC RF-03-A-84;
NOTE Coordinating European Council for the Development of Performance Tests for Lubricants and Engines Fuels.
— J1SK2202;
— J1SK2204;
NOTE Japan Industrial Standards.
— 40 CFR, Part 86.113-04 or the latest edition for spark-ignition engines;
— 40 CFR, Part 86.1313-04 or the latest edition for compression-ignition engines. NOTE Title 40, Code of Federal Regulations, USA.
A commercially available fuel may be used, providing its characteristics are specified in &3 and that is does not contain any supplementary smoke-suppressant or additive.
5.4 Test procedure
Measurements shall be taken at a sufficient number of engine speeds to define the power curve completely between the lowest and the highest engine speeds recommended by the manufacturer. This range of speeds shall include the revolution speed at which the engine produces its maximum power.
5.5 Data to be recorded
Data to be recorded shall be those indicated in Clause 8.
6.2.1 Reference atmospheric conditions
For the purposes of determining the power and fuel consumption of engines, the reference atmospheric
conditions given in 6.2.1.1 and 6.2.1.2 shall be used.
6.2.1.1
Temperature
The reference temperature, Trer is 298 K (25 °C).
6.2.1.2 Dry pressure
The reference dry barometric pressure, Pd, ref is 99 kPa.
The dry barometric pressure is based on a total pressure of 100 kPa and a vapour pressure of 1 kPa.
6.2.2 Test atmospheric conditions
The test atmospheric conditions shall be within the values given in 6.2.2.1 and 6.2.2.2 during the test.
6.2.2.1 Temperature, T
For sparkignition engines:288 K≤T’S 308 K
For compression-ignition engines:283K≤T≤313 K
6.2.2.2 Dry pressure, Pd
For all engines: 80kPa≤Pa≤110 kPa
6.3 Determination of power correction factors
The test may be carried out in air-conditioned test rooms where the atmospheric conditions are controlled in order to maintain the correction factor as close to 1 as possible.
Where an influencing parameter is controlled by an automatic device, no power correction for that parameter shall be applied, provided that the relevant parameter is within the relevant range of the device. This applies in particular to:
a) automatic air temperature controls where the device is still operating at 298 K;
b] automatic boost control, independent of atmospheric pressure, when the atmospheric pressure is such that the boost control is working;
c) automatic fuel control where the governor adjusts the fuel flow for constant power output (by compensating for the influence of ambient pressure and temperature).
However, in the case of a), if the automatic air temperature device is fully closed at full load at 298 K (no heated air added to the intake air), the test shall be carried out with the device fully closed, and the normal correction factor applied. In the case of c), the fuel flow for compression-ignition engines shall be corrected by the reciprocal of the power correction factor.BS ISO 1585 pdf free download.Road vehicles