ECE R101 PDF

Approvals may also be extended to vehicles which: a Are up to kg heavier than the family member tested, provided that they are within kg of the lightest member of the family, b Have a lower overall transmission ratio than the family member tested due solely to a change in tyre sizes, and c Conform to the family in all other respects. For vehicles of category N 1 that are approved as members of a vehicle family using the procedure in paragraph 7. Approval of vehicles of category N 1 within a family, if powered by an internal combustion engine only or by a hybrid electric power train Vehicles of category N can be approved within a family as defined in paragraph 7. N vehicles may be grouped together into a family for the purposes of this Regulation if the following parameters are identical or within the specified limits: a Manufacturer and type as defined in Annex 4 to this Regulation, item 2. The following parameters have to be within the following limits: a Transmission overall ratios no more than 8 per cent higher than the lowest as defined in Annex 4 to this Regulation, item 6.

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The cycles may be performed on a flat road, in the absence of wind. However, to improve repeatability , they are generally performed on a roller test bench.

This type of bench is equipped with an electrical machine to emulate resistance due to aerodynamic drag and vehicle mass inertia. For each vehicle configuration, a look-up table is applied: each speed corresponds to a certain value of resistance reverse torque applied to the drive wheels.

This arrangement enables the use of a single physical vehicle to test all vehicle body styles Sedan, hatchback, MPV etc. A fan is coupled to the roller bench to provide the vehicle air intakes with an airflow matching the current speed. Many more tests can be performed during vehicle development with this arrangement than with conventional road tests.

The test is conducted with all ancillary loads turned off Air conditioning compressor and fan, lights, heated rear window, etc. Combined[ edit ] The combined fuel economy is calculated by a total consumption of urban and extra-urban cycles over the total distance theoretical meters.

Criticism[ edit ] Inability to represent real-life driving[ edit ] The NEDC was conceived when European vehicles were lighter and less powerful. The test offers a stylized driving speed pattern with low accelerations, constant speed cruises, and many idling events.

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UN ECE R101 Fuel Consumption

The cycles may be performed on a flat road, in the absence of wind. However, to improve repeatability , they are generally performed on a roller test bench. This type of bench is equipped with an electrical machine to emulate resistance due to aerodynamic drag and vehicle mass inertia. For each vehicle configuration, a look-up table is applied: each speed corresponds to a certain value of resistance reverse torque applied to the drive wheels.

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EUR-Lex Access to European Union law

Introduction This annex defines the specific provisions regarding type approval of a vehicle equipped with a periodically regenerating system as defined in paragraph 2. Scope and extension of the type approval Vehicle family groups equipped with periodically regenerating system The procedure applies to vehicles equipped with a periodically regenerating system as defined in paragraph 2. For the purpose of this annex vehicle family groups may be established. Accordingly, those vehicle types with regenerative systems, whose parameters described below are identical, or within the stated tolerances, shall be considered to belong to the same family with respect to measurements specific to the defined periodically regenerating systems.

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World Forum for Harmonization of Vehicle Regulations

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