Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Energy Efficiency, Emissions, Tribological Challenges and Fluid Requirements of Electrified Passenger Car Vehicles

Version 1 : Received: 24 May 2021 / Approved: 26 May 2021 / Online: 26 May 2021 (08:04:01 CEST)
Version 2 : Received: 16 June 2021 / Approved: 17 June 2021 / Online: 17 June 2021 (10:46:41 CEST)

How to cite: Taylor, R.I. Energy Efficiency, Emissions, Tribological Challenges and Fluid Requirements of Electrified Passenger Car Vehicles. Preprints 2021, 2021050622 (doi: 10.20944/preprints202105.0622.v1). Taylor, R.I. Energy Efficiency, Emissions, Tribological Challenges and Fluid Requirements of Electrified Passenger Car Vehicles. Preprints 2021, 2021050622 (doi: 10.20944/preprints202105.0622.v1).

Abstract

The motivations for the move to electrified vehicles are discussed with reference to their improved energy efficiency, their potential for lower CO2 emissions (if the electricity system is decarbonized), their lower (or zero) NOx/particulate matter (PM) tailpipe emissions, and the lower overall costs for owners. Some of the assumptions made in life-cycle CO2 emissions calculations are discussed and the effect of these assumptions on the CO2 benefits of electric vehicles are made clear. A number of new tribological challenges have emerged, particularly for hybrid vehicles that have both a conventional internal combustion engine and a battery, such as the need to protect against the much greater number of stop-starts that the engine will have during its lifetime. In addition, new lubricants are required for electric vehicle transmissions systems. Although full battery electric vehicles (BEVs) will not require engine oils (as there is no engine) they will require a system to cool the batteries – alternative cooling systems are discussed, and where these are fluid based, the specific fluid requirements are outlined.

Subject Areas

Energy Efficiency; Emissions; Tribology; Lubrication; Battery Electric Vehicles; Hybrid Electric Vehicles; Life Cycle Analysis; Thermal Cooling Fluids

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