AHK is a complex electrohydraulic system developed to improve high - speed stability whereas Integral Active Steering is a simpler electromechanical system developed to improve the low - speed turn radius, although it improves high - speed stability as well. (e31wiki.org)
The XT6 was also fitted with a unique Cybrid adaptive electrohydraulic steering system that changed the level of assistance based on the vehicle's speed. (en.wikipedia.org)
Stop - and - go driving is noticeably smoother thanks to retirement of the grabby electrohydraulic brake system that plagued the E-Class from 2003 to 2006. (kbb.com)