So, based on the SAE article that @AnthonyW posted, I googled Honda R&D. If anyone is good at making international calls and fluent in Japanese, according to Google here is the number for the Honda R&D Center at Tochigi where I suspect most of the Clarity technology was developed: +81 28-677-3311. The hope would be that who ever answered the call would actually put you in touch with a technical person who you could then send a message to providing a link to this forum where all these unanswered questions await their dispatch. As a start, maybe you could ask for one of the three names on the SAE article from April: Toru Ohgaki, Masanori Matsuda, or Mitsunori Matsumoto. Additionally here are the two names from the "New Two-Motor Hybrid System" presentation from November 2013: Naritomo Higuchi and Hiroo Shimada.