FEV says the second generation HECS has been adapted to a downsized 1.6L 4-cylinder diesel engine, and is designed specifically for a high specific power output of over 100 kW/L.
“To achieve this output, FEV engineers designed a 200 bar peak pressure cylinder head with variable valve lift. The variable valve lift is accomplished through the use of a unique roller finger follower that is adjustable for two different lifts. Combined with variable valve lift is a unique seat-swirl chamfer that FEV has engineered into the system. Both modifications increase swirl, contributing to greatly improved combustion,” the company explains in a statement for the press.
In terms of thermal management, the HECS concept incorporates split cooling, and an air gap insulated exhaust gas manifold, which generally contributes to improved aftertreatment functionality, and especially during cold start to achieve early catalyst light-off. A dual-wall exhaust also reduces heat loss in order to accelerate catalyst light-off during cold starts.
Cam phasers have been incorporated to enhance performance, as well as high and low pressure EGR.
The cylinder head has been incorporated into a demonstration vehicle that is targeted to achieve ultra-low CO2 emissions as well as the lowest possible fuel consumption. The first phase of the project was directed at development of the combustion system. Future development phases for the HECS demonstration vehicle include optimization of the engine's mechanical components/accessories, hybridization/electrification of the powertrain, and vehicle improvements (drag/rolling resistance/weight).
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