Patent ID: 9156199
Filing Date: 2015-10-13
Classification: B29C,F15B,Y02P

Abstract:
1. A method for operating a hybrid drive having an electric machine configured to be operated in generator mode or motor mode and a hydraulic drive with a hydraulic piston and a piston rod in mechanical engagement with the electric machine, the method comprising the steps of: determining an operating direction and an operating force requested by the hybrid drive, switching a valve or valve combination connected to the hydraulic drive into a position such that the hydraulic drive is effective in the determined operating direction, determining a difference between a force produced by the hydraulic drive and the requested operating force, when the force produced by the hydraulic drive is smaller than the requested operating force, operating the electric machine in motor mode such that the requested operating force is attained by adding a force produced by the electric machine to the force produced by the hydraulic drive, and when the force produced by the hydraulic drive is greater than the requested operating force, driving the electric machine in generator mode by the piston rod, thereby braking the hydraulic drive, and generating regenerated electric energy which is supplied for further use.