By preventing engagement of an engaging part (clutch) under appropriate conditions, it is possible to effectively avoid the so-called surging phenomenon. When there is an engaging directive for the clutch, the rotational speed of the engaging element positioned at the output shaft side of the drive/regeneration...http://www.google.com.au/patents/US6377883?utm_source=gb-gplus-sharePatent US6377883 - Control apparatus for hybrid vehicle
