‘1.2.2.

(a)

the first paragraph is replaced by the following:

‘The engine manufacturer shall not indicate at any time that an engine type or engine family may be operated within the Union on market fuels other than those that comply with the requirements in this point unless the manufacturer additionally complies with the requirement in point 1.2.3’;

(b)

point (c) is replaced by the following:

‘6.2.3.1.

‘3.1.3.

The test engine shall represent the emission deterioration characteristics of the engine families that will apply the resulting deterioration factors for type approval. The engine manufacturer shall select one engine representing the engine family, group of engine families or engine-after-treatment system family, as determined in accordance with point 3.1.2, for testing over the service accumulation schedule referred to in point 3.2.2, which shall be reported to the approval authority before any testing commences.

3.1.4.

If the approval authority decides that the worst case emissions of the engine family, group of engine families or engine-after-treatment system family can be better characterised by another test engine, the test engine to be used shall be selected jointly by the approval authority and the engine manufacturer.’;

‘3.2.6.1.1.

‘2.2.3.1.

Notwithstanding point 2.2.3, in the case of engine (sub-)categories that are not subject to non-road transient test cycles for EU type-approval purposes, the base emission control strategy may identify when transient operating conditions occur and apply the corresponding emission control strategy. In this case, this emission control strategy shall be included in the overview of the base emission control strategy required by point 1.4 of Annex I to Implementing Regulation (EU) 2017/656 and in the confidential information on emission control strategy set out in Appendix 2 to that Annex.

2.2.4.

The manufacturer shall demonstrate to the technical service at the time of the EU type-approval test that the operation of the base emission control strategy complies with the provisions of this section on the basis of the documentation referred to in point 2.6.’;

‘2.6.1.

The manufacturer shall comply with the documentation requirements laid down in point 1.4 of Part A of Annex I to Implementing Regulation (EU) 2017/656 and Appendix 2 to that Annex.

2.6.2.

The manufacturer shall ensure that all documents used for this purpose are marked with an identification number and date of issue. The manufacturer shall notify to the approval authority whenever the particulars recorded are changed. In this case, it shall issue, either a updated version of the documents concerned where the relevant pages are marked clearly showing the date of revision and the nature of the amendment, or alternatively, a new consolidated version accompanied by an index containing a detailed description and date of each amendment.’;

(a)

point 2.2.1 is replaced by the following:

(b)

the following points 2.2.2 and 2.2.3 are inserted:

(c)

the following point 2.3.2.2.4 is inserted:

(d)

point 2.3.2.3 is replaced by the following:

(e)

the following points 2.3.2.3.1 and 2.3.2.3.2 are inserted:

(f)

points 2.3.3, 2.3.3.1 and 2.3.3.2 are deleted;

(g)

in point 5.2.1.1, the following point (ea) is inserted:

(h)

point 9.5 is replaced by the following:

(i)

points 10.3.1 to 10.3.3.1 are replaced by the following:

10.3.1.   The compliance of the warning system activation shall be demonstrated by performing two tests: lack of reagent, and one failure category identified in sections 7, 8 or 9.

10.3.2.   Selection of the failure to be tested among those referred to in sections 7, 8 or 9.

10.3.2.1.   The approval authority shall select one failure category. In the case that a failure is selected from points 7 or 9, the additional requirements set out in points 10.3.2.2 or 10.3.2.3 shall apply, respectively.

10.3.2.2.   For the purpose of demonstrating the activation of the warning system in case of a wrong reagent quality, a reagent shall be selected with a dilution of the active ingredient at least as dilute as that communicated by the manufacturer in accordance with the requirements set out in points 7 to 7.3.3.

10.3.2.3.   For the purpose of demonstrating the activation of the warning system in case of failures that may be attributed to tampering, and are defined in section 9 the selection shall be performed in accordance with the following requirements:

10.3.3.   Demonstration

10.3.3.1.   For the purpose of this demonstration, a separate test shall be performed for the lack of reagent and the failure selected in accordance with points 10.3.2 to 10.3.2.3.2.’;

(j)

the following points 10.5 and 10.5.1 are inserted:

‘10.5.   Documentation of the demonstration

10.5.1.   A demonstration report shall document the demonstration of the NCD system. The report shall:

(k)

points 11.4.1.1 and 11.4.1.1.1 are replaced by the following:

(l)

the following points 13.4 and 13.4.1 are added:

‘13.4.   Documentation of the demonstration

13.4.1.   A demonstration report shall document the demonstration of the minimum acceptable reagent concentration. The report shall:

(a)

points 2 to 4.5 are replaced by the following:

‘2.   General requirements

The requirements of Appendix 1 apply to engines in scope of this Appendix, except as set out in points 3 and 4 of this Appendix.

3.   Exceptions to the requirements of Appendix 1

In order to account for safety concerns the operator inducement system set out in points 5 and 11.3 of Appendix 1 shall not apply to engines under the scope of this Appendix. The requirement to store data in an on-board computer log set out in point 4 of this Appendix shall apply wherever the inducement would have been activated in accordance with points 2.3.2.3.2, 6.3, 7.3, 8.4 and 9.4 of Appendix 1.

4.   Requirement for storing incidents of engine operation with inadequate reagent injection or reagent quality

4.1.   The on-board computer log must record in non-volatile computer memory or counters the total number and duration of all incidents of engine operation with inadequate reagent injection or reagent quality in a manner to ensure that the information cannot be intentionally deleted.

4.1.1.   It shall be possible for national inspection authorities to read these records with a scan tool.

4.1.2.   A description of the connection for, and method to read, these records shall be included in the information folder as set out in Part A of Annex I of Implementing Regulation (EU) 2017/656.

4.2.   The duration of an incident of inadequate reagent level recorded in the on-board computer log as specified in point 4.1, in place of an inducement in accordance with point 6.3 of Appendix 1, shall commence when the reagent tank becomes empty, that is, when the dosing system is unable to draw further reagent from the tank, or at any level below 2,5 % of its nominally full capacity at the discretion of the manufacturer.

4.3.   The duration of an incident recorded in the on-board computer log as specified in point 4.1, in place of the inducement specified in points 6.3, 7.3, 8.4 and 9.4 of Appendix 1, shall commence when the respective counter reaches the value for severe inducement in Table 4.4 of Appendix 1.

4.4.   The duration of an incident recorded in the on-board computer log as specified in point 4.1, in place of the inducement specified in point 2.3.2.3.2 of Appendix 1, shall commence when inducement would have commenced.

4.5.   The duration of an incident recorded in the on-board computer log as specified in point 4.1 shall end when the incident has been remedied.’;

(b)

the following point 4.6 is inserted:

(a)

point 2.2.1 is replaced by the following:

(b)

point 3.1 is replaced by the following:

(c)

the following point 5.4 is inserted:

(d)

point 9.2.1 is replaced by the following:

‘9.2.1.

In the case where engines of an engine family belong to a PCD engine family that has already been EU type-approved, in accordance with point 2.3.6 (Figure 4.8), the compliance of that engine family is deemed to be demonstrated without further testing, provided the manufacturer demonstrates to the authority that the monitoring systems necessary for complying with the requirements of this Appendix are similar within the considered engine and PCD engine families. Figure 4.8 Previously demonstrated conformity of a PCD engine family PCD engine family 1 Engine family 2 Engine family 1 Conformity of PCD engine family 1 has been demonstrated for Engine family 2 Conformity of Engine family 1 is considered as demonstrated ’;

(e)

in point 9.3.3.6.2, point (a) is replaced by the following:

(f)

the following points 9.3.6 and 9.3.6.1 are added:

‘9.3.6.   Documentation of the demonstration

9.3.6.1.   A demonstration report shall document the demonstration of the PCD system. The report shall:

(a)

Figure 5.2 is replaced by the following:

‘ Figure 5.2

Control area for variable-speed engines of category NRE with maximum net power < 19 kW and variable-speed engines of category IWA with maximum net power < 300 kW, speed C < 2 400 rpm

Torque (% of maximum)

Speed (%)

Key

(b)

Figure 5.3 is replaced by the following:

‘ Figure 5.3

Control area for variable-speed engines of category NRE with maximum net power < 19 kW and variable-speed engines of category IWA with maximum net power < 300 kW, speed C ≥ 2 400 rpm

Torque (% of maximum)

Speed (%)

Key

‘3.1.

(a)

the introductory wording is replaced by the following

‘The test shall be carried out immediately after the applicable NRSC as follows:’;

(b)

point (a) is replaced by the following:

(c)

points (e) and (f) are replaced by the following:

(a)

The engine shall be operated in a manner to ensure that the regeneration event has completed and, where applicable, the soot load in the particulate after-treatment system has been re-established;

(b)

The engine warm-up procedure shall be performed in accordance with point 7.8.1.1 of Annex VI;

(c)

The test procedure specified in point 4 shall be repeated commencing at the stage referred to in point 4(b).’.

(a)

the crankcase emissions determined in accordance with section 6.10, if relevant,

(b)

the adjustment factors for infrequent regeneration of the after-treatment system determined in accordance with section 6.6, if relevant, and

(c)

as the final step of the calculation, the deterioration factor determined in accordance with Annex III,

(a)

Calculation based upon low speed and high speed values

where:

(b)

Calculation based upon the longest vector method

where:

If there is only one speed at which the value of (n 2 norm i  + P 2 norm i ) is equal to 98 % of the maximum value of (n 2 norm i  + P 2 norm i ):

where:

where:

n	is the engine speed
i	is an indexing variable that represents one recorded value of an engine map
n norm i	is an engine speed normalized by dividing it by
P norm i	is an engine power normalized by dividing it by Pmax
	is the average of the lowest and highest speeds at which power is equal to 98 % of P max.

Linear interpolation shall be used between the mapped values to determine:

(i)	the speeds where power is equal to 98 % of P max. If there is only one speed at which power is equal to 98 % of Pmax, shall be the speed at which Pmax occurs;

(a)

the first paragraph is replaced by the following:

‘The rated speed is defined in Article 3(29) of Regulation (EU) 2016/1628. Rated speed for variable-speed engines subject to an emission test other than those tested on a constant-speed NRSC defined in Article 1(31) of this Regulation shall be determined from the applicable mapping procedure set out in point 7.6 of this Annex. Rated speed for variable-speed engines tested on a constant-speed NRSC shall be declared by the manufacturer according to the characteristics of the engine. Rated speed for constant-speed engines shall be declared by the manufacturer according to the characteristics of the governor. Where an engine type equipped with alternative speeds as permitted by Article 3(21) of Regulation (EU) 2016/1628 is subject to an emission test, each alternative speed shall be declared and tested.’;

(b)

the third paragraph is replaced by the following:

‘For engines of category NRSh the 100 % test speed shall be within ± 350 rpm of the rated speed declared by the manufacturer.’;

(a)

the introductory wording of the first paragraph is replaced by the following:

‘Where required, the maximum torque speed determined from the maximum torque curve established by the applicable engine mapping procedure in point 7.6.1 or 7.6.2 shall be one of the following:’;

(b)

in the last paragraph, the words ‘engines of category NRS or NRSh’ are replaced by the words ‘engines of category NRS’;

(a)

a coolant temperature of at least 293 K (20 °C) shall be maintained at the inlet to the charge-air cooler throughout testing;

(b)

at the rated speed and full load, the coolant flow rate shall be set to achieve an air temperature within ± 5 K (± 5 °C) of the value designed by the manufacturer after the charge-air cooler's outlet. The air- outlet temperature shall be measured at the location specified by the manufacturer. This coolant flow rate set point shall be used throughout testing;

(c)

if the engine manufacturer specifies pressure-drop limits across the charge-air cooling system, it shall be ensured that the pressure drop across the charge-air cooling system at engine conditions specified by the manufacturer is within the manufacturer's specified limit(s). The pressure drop shall be measured at the manufacturer's specified locations;’;

(a)

the last sentence of the first paragraph is replaced by the following:

‘The exact procedure to determine this frequency shall be agreed by the approval authority based upon good engineering judgement.’;

(b)

the title of Figure 6.1 is replaced by the following:

‘ Figure 6.1

Scheme of infrequent regeneration with n number of measurements and nr number of measurements during regeneration ’;

(c)

equation (6-9) and the legend thereof are replaced by the following:

‘

(6-9)

Where:

n	is the number of tests in which regeneration does not occur,
n r	is the number of tests in which regeneration occurs (minimum one test),
	is the average specific emission from a test in which the regeneration does not occur [g/kWh or #/kWh]
	is the average specific emission from a test in which the regeneration occurs [g/kWh or #/kWh]’;

(d)

equations (6-10) and (6-11) are replaced by the following:

‘	(upward adjustment factor)	(6-10)
	(downward adjustment factor)	(6-11)’;

(a)	equations (6-12) and (6-13) are replaced by the following: ‘ (upward adjustment factor) (6-12) (downward adjustment factor) (6-13)’;

‘(b)

(a)

the heading is replaced by the following:

‘7.3.1.1.   General requirements for preconditioning the sampling system and the engine’;

(b)

the following paragraph is added:

‘Engines fitted with an after-treatment system may be operated prior to cycle-specific preconditioning set out in points 7.3.1.1.1 to 7.3.1.1.4, so that the after-treatment system is regenerated and, where applicable, the soot load in the particulate after-treatment system is re-established.’;

(a)

Leak checks shall be performed within 8 hours prior to emission sampling in accordance with point 8.1.8.7;

(b)

For batch sampling, clean storage media shall be connected, such as evacuated bags or tare-weighed filters;

(c)

All measurement instruments shall be started in accordance with the instrument manufacturer's instructions and good engineering judgment;

(d)

Dilution systems, sample pumps, cooling fans, and the data-collection system shall be started;

(e)

The sample flow rates shall be adjusted to desired levels, using bypass flow, if desired;

(f)

Heat exchangers in the sampling system shall be pre-heated or pre-cooled to within their operating temperature ranges for a test;

(g)

Heated or cooled components such as sample lines, filters, chillers, and pumps shall be allowed to stabilize at their operating temperatures;

(h)

Exhaust gas dilution system flow shall be switched on at least 10 minutes before a test sequence;

(i)

Calibration of gas analyzers and zeroing of continuous analyzers shall be carried out in accordance with the procedure of point 7.3.1.5;

(j)

Any electronic integrating devices shall be zeroed or re-zeroed, before the start of any test interval.

(a)

in the first paragraph, point (h) is replaced by the following:

(b)

Figure 6.4 is replaced by the following:

‘ Figure 6.4

Test sequence

Emissions calculation

1) Data collection 2) Post-test procedures 3) Evaluations

Hot start exhaust emission test phase

Exhaust emission test

Pre-condition & warm-up engine

Pre-condition engine

If transient cycle and steady state cycle are applied

Run one or more practice cycle as necessary to check engine/test

Define steady-state test cycle

Generate engine map (maximum torque curve)

Transient (NRTC & LSI-NRTC)

Steady-state (discrete & RMC)

NRTC

LSI-NRTC

Hot soak

Cold start exhaust emission test phase

Ready all systems for sampling (analyzer, calibration included) & data collection

Natural or forced cool down

Generate reference transient test cycle

Generate engine map maximum torque curve or constant speed operating line) if transient cycle not applied

‘(a)

If the engine stalls anywhere during the cold start run of the NRTC, the entire test shall be voided;

(b)

If the engine stalls anywhere during the hot-start run of the NRTC, only this run shall be voided. The engine shall be soaked in accordance with point 7.8.3, and the hot-start run repeated. In this case, the cold-start run does not need to be repeated;’;

(a)

point (b) is replaced by the following:

The mode length shall be recorded and reported.’;

(b)

in point (c), the first paragraph is replaced by the following:

‘For PM emissions, the PM sampling may be done either with the single filter method or with the multiple filter method. Since the results of the methods may differ slightly, the method used shall be declared with the results.’;

(a)

the row referring to point 8.1.11.4 is replaced by the following:

(b)

the row referring to point 8.1.12.1 is replaced by the following:

‘(iv)

‘(b)

‘(b)

(a)

in point (b), the last sentence is replaced by the following:

‘With the FID fuel and airflow rates set at the manufacturer's recommendations, a span gas shall be introduced to the analyzer;’;

(b)

point (c) is amended as follows:

(a)

point (e) is replaced by the following:

(b)

the last sentence of point (f) is replaced by the following: ‘Note that the sample dryer shall meet the sample dryer verification check in point 8.1.12;’;

(i)

polytetrafluoroethylene (“PTFE”) or stainless steel tubing shall be used to make necessary connections;

(ii)

N2 or purified air shall be humidified by bubbling it through distilled water in a sealed vessel that humidifies the gas to the highest sample dew point that is estimated during emission sampling;

(iii)

The humidified gas shall be introduced upstream of the sample dryer;

(iv)

The humidified gas temperature downstream of the vessel shall be maintained at least 5 K (5 °C) above its dew point;

(v)

The humidified gas dew point, T dew, and pressure, p total, shall be measured as close as possible to the inlet of the sample dryer to verify that the dew point is the highest that was estimated during emission sampling;

(vi)

The humidified gas dew point, T dew, and pressure, p total, shall be measured as close as possible to the outlet of the sample dryer;

(vii)

The sample dryer meets the verification if the result of point (d)(vi) of this section is less than the dew point corresponding to the sample dryer specifications as determined in point 9.3.2.3.1 plus 2 K (2 °C) or if the mol fraction from (d)(vi) is less than the corresponding sample dryer specifications plus 0,002 mol/mol or 0,2 volume %. Note for this verification, sample dew point is expressed in absolute temperature, Kelvin.’;

(a)

Independent verification of PM balance performance within 370 days prior to weighing any filter;

(b)

Zero and span of the balance within 12 h prior to weighing any filter;

(c)

Verification that the mass determination of reference filters before and after a filter weighing session be less than a specified tolerance.

(a)

A manual procedure requires that the balance shall be used in which the balance shall be zeroed and spanned with at least one calibration weight. If normally mean values are obtained by repeating the weighing process to improve the accuracy and precision of PM measurements, the same process shall be used to verify balance performance;

(b)

An automated procedure is carried out with internal calibration weights that are used automatically to verify balance performance. These internal calibration weights shall meet the specifications in point 9.5.2 to perform that verification.

(a)

At least two samples of unused PM sample media shall be kept in the PM-stabilization environment. These shall be used as references. Unused filters of the same material and size shall be selected for use as references;

(b)

References shall be stabilized in the PM stabilization environment. References shall be considered stabilized if they have been in the PM-stabilization environment for a minimum of 30 min, and the PM-stabilization environment has been within the specifications of point 9.3.4.4 for at least the preceding 60 min;

(c)

The balance shall be exercised several times with a reference sample without recording the values;

(d)

The balance shall be zeroed and spanned. A test mass shall be placed on the balance (e.g. calibration weight) and then removed ensuring that the balance returns to an acceptable zero reading within the normal stabilization time;

(e)

Each of the reference media (e.g. filters) shall be weighed and their masses recorded. If normally mean values are obtained by repeating the weighing process to improve the accuracy and precision of reference media (e.g. filters) masses, the same process shall be used to measure mean values of sample media (e.g. filters) masses;

(f)

The balance environment dew point, ambient temperature, and atmospheric pressure shall be recorded;

(g)

The recorded ambient conditions shall be used to correct results for buoyancy as described in point 8.1.13.2. The buoyancy-corrected mass of each of the references shall be recorded;

(h)

Each of the reference media's (e.g. filter's) buoyancy-corrected reference mass shall be subtracted from its previously measured and recorded buoyancy-corrected mass;

(i)

If any of the reference filters' observed mass changes by more than that allowed under this section, all PM mass determinations made since the last successful reference media (e.g. filter) mass validation shall be invalidated. Reference PM filters may be discarded if only one of the filters mass has changed by more than the allowable amount and a special cause for that filter's mass change can be positively identified which would not have affected other in-process filters. Thus the validation can be considered a success. In that case, the contaminated reference media shall not be included when determining compliance with paragraph (j) of this point, but the affected reference filter shall be discarded and replaced;

(j)

If any of the reference masses change by more than that allowed under point 8.1.13.1.4, all PM results that were determined between the two times that the reference masses were determined shall be invalidated. If reference PM sample media is discarded in accordance with point (i), at least one reference mass difference that meets the criteria set out in point 8.1.13.1.4 shall be available. Otherwise, all PM results that were determined between the two times that the reference media (e.g. filters) masses were determined shall be invalidated.

(a)

For PTFE-coated borosilicate glass, a sample media density of 2 300 kg/m3 shall be used;

(b)

For PTFE membrane (film) media with an integral support ring of polymethylpentene that accounts for 95 % of the media mass, a sample media density of 920 kg/m3 shall be used;

(c)

For PTFE membrane (film) media with an integral support ring of PTFE, a sample media density of 2 144 kg/m3 shall be used.

m cor

is the PM sample filter mass corrected for buoyancy

m uncor

is the PM sample filter mass uncorrected for buoyancy

ρ air

is the density of air in balance environment

ρ weight

is the density of calibration weight used to span balance

ρ media

is the density of PM sample filter

p abs

is the absolute pressure in balance environment

M mix

is the molar mass of air in balance environment

R

is the molar gas constant.

T amb

is the absolute ambient temperature of balance environment’;

‘(b)

(a)

measuring the temperature at the outlet of the sample dryer; or

(b)

measuring humidity at a point just upstream of the CLD; or

(c)

performing the verification procedure in point 8.1.12.’;

(a)

point (i) is replaced by the following:

(b)

in point (iii), in Table 6.9, the third row is replaced by the following:

‘(i)

‘(b)

(a)

in point 1.3.4, the first sentence is replaced by the following:

‘For particle number measurement, exhaust gas mass flow rate, determined according to any of the methods described in points 2.1.6.1 to 2.1.6.4 of Annex VII, is used for controlling the partial flow dilution system to take a sample proportional to the exhaust gas mass flow rate.’;

(b)

in point 2.1.3.3.3, the first sentence is replaced by the following:

‘Control heated stages to constant nominal operating temperatures, within the range specified in point 2.1.3.3.2, to a tolerance of ± 10 K (± 10 °C).’;

(c)

in point 2.1.4, figure 6.10 is replaced by the following

‘ Figure 6.10

Schematic of recommended particle sampling system – Full flow sampling

(a)

in point 4.2.7, the last sentence is replaced by the following:

‘The expiration date of the calibration gases shall be recorded.’;

(b)

in point 4.2.8, point (j) is replaced by the following:

(a)

in point 2.4, figure 6-11 is replaced by the following:

‘ Figure 6-11

Illustration of system responses

Response

Time

rise time

delay time

transformation time

response time

Step input time

(b)

the following point 2.5 is added:

‘w C

=

carbon content of fuel [% mass] (see equation (7-82) of point 3.3.3.1 or table 7.3)’;

‘M da,w

=

molar mass of dilution air [g/mol] (see equation (7-144) of point 3.9.3)

M r,w

=

molar mass of raw exhaust gas [g/mol] (see Appendix 2 point (5)’;

(a)

in the legend of equation (7-59), the following row is added:

(b)

in the legend of equation (7-60), the row corresponding to the term ‘Ti, AUX’ is replaced by the following:

(a)

the row corresponding to the term ‘Pi’ is replaced by the following:

(b)

the following row is added:

(a)

equation (7-66) is replaced by the following:

‘

(7-66)’;

(b)

the legend of equation (7-66) is amended as follows:

(c)

equation (7-67) is replaced by the following:

‘

(7-67)’;

(d)

the legend of equation (7-67) is amended as follows:

(a)

Continuous sampling, varying flow rate, shall be calculated by means of equation (7-106):

[see equation (7-106)]

Where:

(b)

Continuous sampling, constant flow rate, shall be calculated by means of equation (7-107):

[see equation (7-107)]

Where:

M gas	=	generic emission molar mass [g/mol]
ṅexh	=	exhaust gas molar flow rate on a wet basis [mol/s]
	=	mean gaseous emission molar fraction on a wet basis [mol/mol]
Δt	=	time duration of test interval

(c)

Batch sampling, regardless the flow rate is varying or constant, shall be calculated by means of equation (7-108):

[see equation (7-108)]

Where:

M gas	=	generic emission molar mass [g/mol]
ṅexhi	=	instantaneous exhaust gas molar flow rate on a wet basis [mol/s]
	=	mean gaseous emission molar fraction on a wet basis [mol/mol]
f	=	data sampling rate [Hz]
N	=	number of measurements [-]

(d)

In case of diluted exhaust gas calculated values for mass of the pollutants shall be corrected by subtracting the mass of background emissions, due to dilution air:

(i)	Firstly, the molar flow rate of dilution air nairdil [mol/s] shall be determined over the test interval. This may be a measured quantity or a quantity calculated from the diluted exhaust gas flow and the flow-weighted mean fraction of dilution air in diluted exhaust gas, ;

(vi)

The total flow of dilution air may be determined from the total flow of diluted exhaust gas and a chemical balance of the fuel, intake air, and exhaust gas as described in point 3.4. In this case, the total mass of background shall be calculated, using the total flow of diluted exhaust gas, n dexh. Then this result shall be multiplied by the flow-weighted mean fraction of dilution air in diluted exhaust gas, .

Considering the two cases (v) and (vi), equations (7-115) and (7-116) shall be used:

or	(7-115)
m gascor = m gas – m bkgnd	(7-116)

where:

m gas	=	total mass of the gaseous emission [g]
m bkgnd	=	total background masses [g]
m gascor	=	mass of gas corrected for background emissions [g]
M gas	=	molecular mass of generic gaseous emission [g/mol]
x gasdil	=	gaseous emission concentration in dilution air [mol/mol]
n airdil	=	dilution air molar flow [mol]
	=	flow-weighted mean fraction of dilution air in diluted exhaust gas [mol/mol]
	=	gas fraction of background [mol/mol]
n dexh	=	total flow of diluted exhaust gas [mol]’;

(a)

in point (i), the introductory wording is replaced by the following;

‘PDP molar flow rate. Based upon the speed at which the Positive Displacement Pump (PDP) operates for a test interval, the corresponding slope a 1, and intercept, a 0 [-], as calculated with the calibration procedure set out in point 3.9.2, shall be used to calculate molar flow rate ṅ [mol/s] by means of equation (7-117):’;

(b)

in point (ii), the introductory wording is replaced by the following:

‘SSV molar flow rate. Based on the C d versus R e # equation determined in accordance with point 3.9.4, the Sub-Sonic Venturi (SSV) molar flow rate during an emission test ṅ [mol/s] shall be calculated by means of equation (7-119):’;

(c)

in point (iii), the introductory wording is replaced by the following:

‘CFV molar flow rate. To calculate the molar flow rate through one venturi or one combination of venturis, its respective mean C d and other constants, determined in accordance with point 3.9.5, shall be used. The calculation of its molar flow rate ṅ [mol/s] during an emission test shall be calculated by means of equation (7-120):’;

(a)

equation (7-126) is replaced by the following:

‘

(7-126)’;

(b)

in the legend of equation (7-126), the following row is added:

(c)

the legend of equation (7-127) is replaced by the following:

‘Where:

(a)

the row corresponding to the term ‘Pi ’ is replaced by the following:

(b)

the following row is added:

(a)

equation (7-133) is replaced by the following:

‘

(7-133)’;

(b)

the legend of equation (7-133) is amended as follows:

(a)

equation (7-134) is replaced by the following:

‘

(7-134)’;

(b)

the legend of equation (7-134) is amended as follows: