Preliminary Development of a Novel 2-Stroke Petrol Engine for a Hybrid Sport-Tourer Motorcycle Universita di Modena e Reggio Emilia

Format:

Book

Conference/Event

Author/Creator:

Rinaldini, Carlo Alberto, author.

Contributor:

Magnani, Gianluca

Mattarelli, Enrico

Montanari, Luca

Scrignoli, Francesco

Volza, Antonello

Conference Name:

SETC2025: 29th Small Powertrains and Energy Systems Technology Conference (2025-11-10 : Florence, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

While hybrid electric powertrains are the standard for passenger cars, the application to motorcycles is almost nil. The reason is the increase in weight, cost and overall dimensions, which can compromise the layout and dynamics of the motorcycle. A viable path is to replace the standard internal combustion engine with a much smaller and lighter unit, which leaves room for the installation of the electric components. The 2-Stroke (2S) cycle technology, thanks to double cycle frequency and inherent simplicity, can be the key to reduce engine dimensions, weight and cost, while keeping high power outputs.The HybridTec project, discussed in this paper, aims to develop a compact and lightweight V-90° two-cylinder 2S engine, coupled to an electric motor installed downstream of the gearbox (P3 configuration). The total installed power should be about 110 kW.The engine features loop-scavenging, actuated by a crankshaft-driven supercharger, while an exhaust rotary valve and electronic fuel injection minimize fuel short-circuit over a broad operating range. Moreover, the control of air and residuals trapped within the cylinder is made by a bypass valve downstream of the supercharger. A 4-Stroke-like forced lubrication system is also adopted.Another advantage of this engine design is the possibility to dilute the fresh charge with exhaust gas, at any operating condition: a proper percentage of residuals helps to cut NOx emissions without the need for complex and expensive after-treatment systems.A single-cylinder prototype of the engine was preliminarily built and tested, the initial design being carried out with the support of a 1D model, which was then calibrated based on a preliminary configuration of the engine.According to the 1D simulation results, the engine is able to meet the performance targets and shows good potential at part-load operation, but engine injection system and control strategy need further optimization, which will be supported by future detailed 3D-CFD analysis

Notes:

Vendor supplied data

Publisher Number:

2025-32-0025

Access Restriction:

Restricted for use by site license