This invention relates to a control system for positioning implements of construction vehicles and implements such as manipulators etc.
In the conventional electric-hydraulic servo systems serving as a positioning device of the kind specified, electric-hydraulic servo valves are generally employed for conducting electric-hydraulic conversion. The electric-hydraulic servo valves are however expensive in cost and are liable to cause troubles when dust etc. enters them and when they undergo vibration, and therefore their applications are restricted.
USPTO Backgrounds
USPTO Backgrounds