There is provided a method and apparatus to determine operating conditions for a powertrain comprising an internal combustion engine and first and second electrical machines and an electro-mechanical transmission selectively operative to transmit torque therebetween. The method comprises determining...http://www.google.com.au/patents/US7991519?utm_source=gb-gplus-sharePatent US7991519 - Control architecture and method to evaluate engine off operation of a hybrid powertrain system operating in a continuously variable mode
