Continental

http://www.conti-online.com/generator/www/com/en/continental/pressportal/themes/press_releases/3_automotive_group/interior/press_releases/pr_20120109_haptic_en,version=1.html

To make the operation of touch elements even safer and more effective for motorists – whose primary task is, after all, to keep their eyes on the road – Continental is focusing on tactile (i.e. haptic) feedback from touch-sensitive surfaces. For example, slight counter-pressure from the display on the driver’s finger indicates that an operating step has been performed successfully, making it unnecessary for the driver to look at the screen again.  

http://www.cst.com/Content/Events/downloads/euc2012/Talk_3-3-3_CST_EUC_2012.pdf

 Development of a planar actuator for active haptic feedback in an automotive environment

Target: haptic feedback when you expect to have haptic feedback, and stiff when you expect it to be stiff!

Different haptic feedbacks generated by electronic module