- AECS
means an emission control strategy that is activated and temporarily modifies a base emission control strategy (BECS) for a specific purpose and in response to a specific set of ambient and/or operating conditions and only remains in operation as long as those conditions exist;
- Ageing cycle
means the non-road mobile machinery or engine operation (speed, load, power) to be executed during the service accumulation period.
- ambient temperature
means, in relation to a laboratory environment (e.g. filter weighing room or chamber), the temperature within the specified laboratory environment;
- audit
means an evidence-gathering process used to evaluate how well audit criteria are being applied;
- BECS
means an emission control strategy that is active throughout the range of torque and speed over which the engine operates, unless an auxiliary emission control strategy (AECS) is activated;
- calibration
means the process of setting a measurement system's response to an input signal so that its output agrees with a range of reference signals;
- calibration gas
means a purified mixture of gases used to calibrate gas analysers;
- confirmed and active DTC
means a DTC that is stored during the time the NCD and/or PCD system concludes that a malfunction exists;
- constant-speed non-road steady-state test cycle
(hereinafter ‘constant-speed NRSC’) means any of the following non-road steady-state test cycles defined in Annex IV to Regulation (EU) 2016/1628: D2, E2, G1, G2 or G3;
- corrective actions
means a problem-solving process with subsequent steps taken to remove the causes of a nonconformity or undesirable situation and designed to prevent their recurrence;
- Critical emission-related components
means the exhaust after- treatment system, the electronic engine control unit and its associated sensors and actuators, and the exhaust gas recirculation (EGR) including all related filters, coolers, control valves and tubing.
- Critical emission-related maintenance
means the maintenance to be performed on critical emission-related components of the engine.
- drift
means the difference between a zero or calibration signal and the respective value reported by a measurement instrument immediately after it was used in an emission test;
- dual-fuel mode
means the normal operating mode of a dual-fuel engine during which the engine simultaneously uses liquid fuel and a gaseous fuel at some engine operating conditions;
- Dual-fuel Type 1A engine
means either:
- Dual-Fuel Type 1B engine
means either:
- Dual-Fuel Type 2A engine
means either:
- Dual-Fuel Type 2B engine
means either:
- Dual-Fuel Type 3B engine
means either:
- Emission-related maintenance
means the maintenance which substantially affects emissions or which is likely to affect emissions performance of the non-road mobile machinery or the engine during normal in-use operation.
- engine governed speed
means the engine operating speed when it is controlled by the installed governor;
- Engine-after-treatment system family
means a manufacturer's grouping of engines that comply with the definition of engine family, but which are further grouped into a family of engine families utilising a similar exhaust after-treatment system.
- full flow dilution
means the method of mixing the exhaust gas flow with dilution air prior to separating a fraction of the diluted exhaust gas flow for analysis;
- good engineering judgment
means judgments consistent with generally accepted scientific and engineering principles and available relevant information;
- governor
means a device or control strategy that automatically controls engine speed or load, other than an over-speed limiter as installed in an engine of category NRSh limiting the maximum engine speed for the sole purpose of preventing the engine operating at speeds in excess of a certain limit;
- liquid-fuel mode
means the normal operating mode of a dual-fuel engine during which the engine does not use any gaseous fuel for any engine operating condition;
- max
refers to a different value:
- maximum torque speed
means the engine speed at which the maximum torque is obtained from the engine, as designed by the manufacturer;
- min
refers to the minimum reference value used during the linearity verification;
- nhi
means the highest engine speed where 70 % of the maximum power occurs;
- nlo
means the lowest engine speed where 50 % of the maximum power occurs;
- Non-emission-related maintenance
means maintenance which does not substantially affect emissions and which does not have a lasting effect on the emissions performance deterioration of the non-road mobile machinery or the engine during normal in-use operation once the maintenance is performed.
- open crankcase emissions
means any flow from an engine's crankcase that is emitted directly into the environment;
- operator demand
means an engine operator's input to control engine output;
- partial flow dilution
means the method of analysing the exhaust gas whereby a part of the total exhaust gas flow is separated, then mixed with an appropriate amount of dilution air prior to reaching the particulate sampling filter;
- Partial flow PM sampling
includes the partial flow dilution to extract only raw exhaust gas with constant or varying dilution ratio.
- particulate after-treatment system
means an exhaust after-treatment system designed to reduce emissions of particulate pollutants through a mechanical, aerodynamic, diffusional or inertial separation;
- Particulate Control Diagnostic system (PCD)
means a system on-board the engine which has a capability of:
- Particulate Control Malfunction (PCM)
means an attempt to tamper with the particulate after-treatment system of an engine or a malfunction affecting the particulate after-treatment system that might be due to tampering, that is considered by this Regulation as requiring the activation of a warning once detected;
- Pmax
means the maximum power in kW as designed by the manufacturer;
- probe
means the first section of the transfer line which transfers the sample to the next component in the sampling system;
- quality management system
means a set of interrelated or interacting elements that organisations use to direct and control how quality policies are implemented and quality objectives are achieved;
- reagent
means any consumable or non-recoverable medium required and used for the effective operation of the exhaust after-treatment system;
- Scan-tool
means an external test equipment used for off-board communication with the NCD and/or PCD system.
- Service accumulation schedule
means the ageing cycle and the service accumulation period for determining the deterioration factors for the engine-after-treatment system family.
- service mode
means a special mode of a dual-fuel engine that is activated for the purpose of repairing, or of moving the non-road mobile machinery to a safe location when operation in the dual-fuel mode is not possible;
- span gas
means a purified gas mixture used to span gas analysers;
- specific emissions
means the mass emissions expressed in g/kWh;
- stoichiometric
means relating to the particular ratio of air and fuel such that if the fuel were fully oxidised, there would be no remaining fuel or oxygen;
- storage medium
means a particulate filter, sample bag, or any other storage device used for batch sampling;
- test interval
means a duration of time over which brake-specific emissions are determined;
- to span
means to adjust an instrument so that it gives a proper response to a calibration standard that represents between 75 % and 100 % of the maximum value in the instrument range or expected range of use;
- tolerance
means the interval in which 95 % of a set of recorded values of a certain quantity shall lie, with the remaining 5 % of the recorded values deviating from the tolerance interval;
- updating-recording
means the frequency at which the analyser provides new, current, values;
- zero gas
means a gas that yields the value zero as response to its input in an analyser;
- zeroed
means that an instrument was adjusted in a manner that it gives a zero response to a zero calibration standard, such as purified nitrogen or purified air;