FEV Introduces Next Generation HECS Diesel

FEV Introduces Next Generation HECS Diesel with 105 kW/l Specific Power Out-put
Technology from Race Track to Street

FEV Motorentechnik GmbH (FEV) today introduced its next generation High Efficiency Combustion System (HECS) diesel engine. The announcement was made at the company’s global headquarters in Aachen. The innovative HECS engine demonstrates FEV’s capability in creating a downsized concept that still offers significant performance levels. The HECS engine provides 105 kW/l and a specific torque of 300 Nm/l while limiting emissions to EU-6 levels. Notably, low emission levels are achieved without the application of additional NOx reduction techniques. FEV states that this is a new benchmark for downsized concepts.

After review of CO₂ reduction technologies for modern diesel motors, FEV determined that downsizing held great promise in the effort to restrict harmful emissions. A particular challenge in developing the HECS engine was increasing power output without negatively affecting the exhaust emissions value. The potential of downsized diesels has also been validated through the success of diesel-powered race cars, including those that have achieved success at Le Mans.

While there is an emissions trade-off in the increase in specific power, since the necessary quantities of fuel are primarily realized through increased injector flow rates, the applied concept meets Euro 6 emission level requirements either with or without DeNOx, depending upon the strategy selection. A Diesel Particulate Filter (DPF) is needed for inertia classes of up to 1590 kg; for heavier vehicles, both a DeNOx and a DPF are necessary.

The FEV HECS engine demonstrates the potential of downsized diesel engine concepts. The power of the 1.6 L HECS engine concept, with a cylinder peak pressure of 220 bar, has been increased through additional optimization steps from 128 kW to 168 kW (230 hp), with a simultaneous increase in torque to 470 Nm over the speed range between 1500 to 3000 rpm. This achievement establishes a new benchmark for future downsizing.

Elevated boost pressure is supplied by a modified two-stage turbocharger system, which con-sists of a fixed geometry supercharger (FGT), a variable geometry turbocharger (VTG) and an external bypass that is opened in the event of high exhaust gas mass flows. Engine modifications reflect the need to retain a well balanced calibration between power, fuel consumption and acoustics.