During a prescribed sequence of operating conditions, with the engines warmed up, the amounts of the above exhaust emissions shall be examined continuously by taking a sample from the raw exhaust gas.

During a prescribed sequence of warmed up engine operating conditions the amounts of the above exhaust emissions shall be examined continuously by taking a sample from the raw exhaust gas.

vent exhaust

exhaust

to particulate sampling system vent

Density of the exhaust gas

Exhaust gas flow

Exhaust gas pressure

exhaust gas recirculation

The gas is mixed and diluted by the exhaust gas, but must not react in the exhaust pipe.

Gas meter or other flow instrumentation to measure the diluted exhaust gas flow.

start recording the exhaust gas mass flow rate, if raw exhaust gas analysis is used,

ratio between density of exhaust component and density of exhaust gas

Diluted exhaust gas flow

Raw exhaust gas flow

For the raw exhaust gas

For the diluted gas

For the dilute exhaust gas 13 In the case of NOx, the NOx concentration (NOxconc or NOxconcc) has to be multiplied by KHNOx (humidity correction factor for NOx quoted in section 1.3.3) as follows KHNOx x conc or KHNOx x concc

Exhaust aftertreatment

The tracer gas concentrations (CO2 or NOx) are measured in the raw exhaust gas, the diluted exhaust gas, and the dilution air with the exhaust gas analyser(s) EGA.

The dilution ratio is calculated from the tracer gas concentrations in the raw exhaust gas, the diluted exhaust gas, and the dilution air.

The dilution ratio is calculated from the tracer gas concentrations in the raw exhaust gas, the diluted exhaust gas, and the dilution air.

Total dilute exhaust gas flow

Determination of the exhaust gas flow

Exhaust gas analysis system for raw exhaust

Exhaust gas analysis system for dilute exhaust

wet concentration of the tracer gas in the diluted exhaust

wet concentration of the tracer gas in the raw exhaust

wet concentration of the tracer gas in raw exhaust

wet concentration of the tracer gas in the diluted exhaust

Concentration of the pollutant measured in the diluted exhaust gas

The calculation of the exhaust gas flow is as follows

the lowest EGR rate

For exhaust emissions calculation the total exhaust mass flow of the engine must be used.

The air was polluted by exhaust gas.

CO2 concentration of the diluted exhaust

There is obviously exhaust gas.

Subject Vehicle exhaust emissions

Exhaust gas mass flow rate on wet basis

Sampled exhaust mass flow rate

density of the exhaust gas (kg m3)

density of the exhaust gas (kg m3

Determination of the diluted exhaust gas flow

The calculation of the instantaneous exhaust gas flow is as follows

Gas meter or other flow instrumentation to measure the diluted exhaust gas flow.