Optimized efficiency in combustion engines will not be enough to meet the CO2 requirements of 2020. Kinetic energy recovery systems have the potential to reduce energy consumption by 10 - 20 % for a passenger car and by up to 25 % for a commercial vehicle. A mechanical flywheel has a high energy density and the potential for low product cost compared to other hybrid systems and there is an opportunity to implement the system in high volumes. The purpose of this project was to develop and evaluate a kinetic flywheel system for Volvo Car Group and Volvo Group. The main focus during 2010-2012 was to verify the system both theoretically and in a demonstrator. The project was partly funded by the Swedish Energy Agency and was carried out in collaboration with SKF and Volvo Group. The main objective was to reduce fuel consumption. The target for passenger cars is to meet the legislated requirements moving towards 2020 < 80 g CO2. A flywheel system mounted at the (gar wheels was designed, to learn more about the technology and to evaluate whether the solution could be implemented in future Volvo cars. Specification 60 kW, Energy in flywheel 540 kJ (60000 rpm) and rear torque 1800 Nm. A number of simulation loops were made, the results within a range depending on chosen control strategy, legislation cycles and specification. For example with a Volvo S60, 4-cylinder engine, automatic gearbox with stop &start system as a reference, the CO2 reduction is - 10 % in NED-C and -14 % in new WLTC. The performance 0-100 km/h and 80-120 km/h improved by - 30 % A demonstrator vehicle was built using a S60 with a 5-cylinder petrol turbo engine with 6 speed automatic gearbox and a stop & start system. The vehicle was upgraded with hybrid brakes and a hybrid control system from the V60 Plug in Hybrid Electrical vehicle, PHEV. The 60 kW flywheel system was designed in collaboration with Flybrid Automotive Limited. Calibration of the vehicle was carried out in 2012 to achieve good drivability with a control strategy that delivered targeted CO2 reduction and performance enhancement. The performance 0-100 km/h, 80-120 km/h and response in speed are remarkable.
Volvo Car Group Flywheel KERS project. Results from theoretical study & tests with a flywheel KERS
2013
20 Seiten, 33 Bilder, 6 Tabellen
Aufsatz (Konferenz)
Englisch
Volvo Car Group flywheel KERS project - Results from theoretical study & tests with a flywheel KERS
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