There is provided an electric power steering system that is able to generate a more appropriate current command value. The heat sink is constructed from a metal sheet which is bent so as to have a horizontal thermally conductive plate and four walls extending upwardly from the plate and jointly define an enclosure. The retractor includes a plurality of flexible arms and a plurality of rigid arms as well as a surgery target immobilizing element. The host controller generates a backoff interrupt when a command cannot be queued. A catalytic phase deposited on said carrier generally includes platinum and rhodium, thus forming a catalytic system for exhaust pipes, said catalytic phase being readily recoverable by simple leaching.