Hans-Peter Wandt (Consultant to Toyota Motor Europe):

3rd generation of the Toyota Prius, electronics as key for efficiency increase in hybrid power trains

Electronics are the key for efficiency increase in hybrid power trains.
As a response to the global issues of CO2 emission, resulting in climate change, air pollution and energy security, Toyota developed hybrid technology and started mass production of hybrid cars in 1997 with the first generation Prius. The key development target has always been the overall efficiency increase and in particular part weight-, size and cost reduction.

In 2003 the second generation Prius was introduced, marking a significant step forward in hybrid technology and becoming the base for following Toyota and Lexus hybrid models.

3rd generation of the Toyota Prius:
After more than 1.1 Mill built Prius II, in 2009 Prius 3rd generation is launched.

Development targets for the 3rd generation Prius were, again, apart from meeting the most stringent emission standards worldwide, the further reduction of fuel consumption and related CO2 emissions, especially under daily driving conditions even with increased power output. Substantial hybrid component size-, weight and cost reductions could be achieved to enhance the multiple vehicle compatibility of this power train.

Major achievements have been made with regards to electric and electronic components as well as to the connecting software. With regards to the fuel consumption improvement in the Japanese 10-15 test mode, more than 65% are related to improvements in the electrical / electronic area.