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Document Title Emissions and CO2 Test Procedure for HD Hybrid Vehicles
Reference Number HDH-07-06
Date
13 Oct 2011
Source(s) Chalmers
Rulemaking Area(s) Heavy-duty Hybrids (HDH)
Meeting(s)
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Excerpts from session reports related to this document
HDH | Session 7 | 12-14 Oct 2011

Prof. Fredriksson presented the work program of the Department of Signals and Systems (DSS) at Chalmers University of Technology, Göteborg. Though the contracts had not yet been signed, DSS had already started the work program. Prof. Fredriksson first gave an overview of energy storage principles (see slide 6) followed by an overview of hybrid topologies (see slides 7 to 9). The most promising solutions are considered to be the hydraulic pump/motor and accumulator, the pneumatic pump/motor and accumulator, the CVT and flywheel, and the motor/generator and flywheel.

Modelling of energy storage systems (flywheel, accumulator) and energy converters (hydraulic pump/motor, CVT) is similar to electric storage and converter models. Also, the pump/motor model can be simulated like the electric motor model (see slides 30 and 31).

The result is a set of simulation models of non-electric powertrain components, which are suitable to be used in a HILS setup. As a first summary, non-electric hybrid powertrain topologies fit well into the same categories as for electric hybrid powertrains, and the mathematical models for flywheel, accumulator and pump/motor have similar model structures as in the Japanese regulation.

In general, information on modelling non-electric hybrids is scarce. Japan can not submit any input, but data might be available in the USA. Prof. Hausberger suggested to contact nonroad manufacturers, since they already use hydraulic hybrids in their equipment.

Next steps would be the development of the models, especially the CVT model, and proposals for component testing methods. Japan indicated that four months might be too short for the development of component testing methods.