Commission Regulation (EU) 2025/258

means an assembly of components that delivers air (oxygen containing media) for reaction in the FCS.

means the load applied to the wheel end in the direction of the shaft axis considering the dynamic wheel radius.

means a predominant mode where an OVC-HV is operating with the propulsion energy being provided exclusively by the REESS.’;

means the maximum design load as defined in the wheel bearing specifications.

means the assembly of all the supporting components and auxiliary systems of an FCS needed to deliver the energy, other than the generating unit itself.

means a component that belongs to a BoP.

means computational fluid dynamic simulation.’;

means the total distance through which one bearing ring can be moved relative to the other in the axial direction.

means a hydrogen storage technology which stores hydrogen in gaseous form;

means a hydrogen storage technology which stores hydrogen at temperatures from close to liquefication up to ambient temperature and at a pressure of at least 200 bar.

means the legal entity that sells the vehicle or axle in which the wheel end is installed.

means a distinct driver-selectable condition which could affect emissions, or fuel and/or energy consumption;

means a technology that enables the vehicle to be connected to an external electrical power supply while in motion, providing direct power to the vehicle’s propulsion and/or auxiliary systems and/or charging the batteries;

means the condition of a hydrogen tank from which it is still possible to reach a full tank in a single refuelling event without venting and which meets any of the following conditions:

means all electric components that are not part of the FCS and / or are electrically not connected to the DC power between FCSS and PCS.

means an energy converter which transforms chemical energy into electric energy via in series connected electrochemical cells, referred to as a fuel cell stack.

means the assembly containing one or more fuel cell stacks in which by means of an electrochemical reaction between fuel and oxidant chemical energy is transferred into electric energy.

means the assembly of components that chemically or physically converts the supplied fuel to a form suitable for use in the fuel cell stack sub-system.

means a system that controls and/or monitors FCS conditions and automatically responds to vehicle power demands while preventing hazardous conditions and damage to the FCS.

means dynamic charging technology that conductively transfers the electrical energy to the vehicle through rails embedded in or on top of the road surface;

means in FCS with a split of inner (primary) and outer (secondary) cooling loops of BoPC, a closed coolant loop that is connected to the cooling media of the different BoPC and is integrated into the FCS as part of the TMS.

means the ring or rings of the wheel bearings with smaller diameter than the outer ring.

means a hydrogen storage technology which stores hydrogen in liquid form;

means the position on the wheel end through which the radial load is applied.

means the measurement of friction losses in the wheel end expressed as a friction torque in Nm.

means the collection of components to exchange waste heat of the FCS, which is stored inside the cooling fluid, with the environment.

means the ring or rings of the wheel bearings with greater diameter than the inner ring.

means dynamic charging technology for connection and power supply with overhead contact line infrastructure on roads;

means dynamic charging technology with current collector poles for connection with overhead contact line infrastructure;

means the collection of components that converts the electric energy generated by the fuel cell stack(s) into electricity useful for vehicle purposes.

means the distance in a wheel bearing between the geometrical centre of two rolling elements when the two rolling elements are diametrically opposed.

(PDS) means the collection of components that connects the FCSS to the power conditioning system and that converts power for FCS use.

means a single driver-selectable mode that is always selected when the vehicle is switched on, regardless of the driver-selectable mode in operation when the vehicle was previously shut down, which meets the following conditions:

means the negative operating clearance in the wheel bearing.

means the load applied to the wheel end perpendicular and vertically to the shaft axis.

means the forward gear ratio of the air compressor to the speed of the engine without slip (pneumatic system);’;

means a coefficient that express the change rate of the set-point for the electric power output of the FCS.

means the procedure of conditioning an unused wheel end under load in order to bring it to a state of representative in-use conditions.

means a setpoint for the electrical power output of the system that is suited to condition the FCS in the specified duration of the conditioning phase.

means the part of the wheel bearing designed to prevent the intrusion of particles or liquids in the wheel bearing, or to prevent lubricant leakage.

means the desired or target value for an essential variable, or process value of a system.

means the legal entity responsible for testing the wheel end, either the wheel end manufacturer or a third-party.

means the assembly of components that provides both thermal and water management for the FCS.

means the bearings that are used to support one wheel end in a vehicle.

means the assembly of components that establish the connection between the wheel and the axle, which includes the wheel bearings, seals and lubricants as well as the wheel hub, if available, and all other components relevant to the rotational friction, and may exclude the brake disc and wheel flange.

means a manufacturer's grouping of wheel ends which through their design, as set out in point 2.3, have similar design characteristics and CO2 and fuel consumption properties.

means the legal entity that produces the wheel end.

means dynamic charging technology that inductively transfers the electrical energy to the vehicle through devices embedded in or on top of the road surface providing magnetic fields;

means the assembly of components that provides the treatment necessary for the process water used in the fuel cell system (FCS).