The secretary presented the work program of the Department of Signals and Systems (DSS) at Chalmers University of Technology, Göteborg, since Prof. Fredriksson could not attend the meeting.

He reported that non-electric hybrid powertrain topologies fit well into the same categories as for electric hybrid powertrains. In general, non-electric hybrids can be divided into serial, parallel and split powertrain topologies. The most promising concepts are CVT and flywheel, motor/generator and flywheel and hydraulic (or pneumatic) pump/motor and accumulator.

An example of component modeling is shown on page 10.

So far, component parameters have been defined for flywheel, accumulator pump/motor and CVT. Also, the hypothesis that no major modifications to the HILS method are needed has been verified. MATLAB/Simulink implementation, standardization of variable names and system modeling for a parallel hydraulic hybrid are ongoing. The work program is on schedule.

One of the major problems is getting data for the modeling from equipment suppliers. EPA will try to supply such data from hydraulic hybrids to Chalmers. Mr. Osaki commented that verification of a non-electric hybrid not only needs component testing, but also complete HILS validation. The secretary responded this would be done during validation step 1.