Patent ID: 7549848
Filing Date: 2009-06-23
Classification: F01M,F04C

Abstract:
1. A system for controlling the pumping capacity of a lubricant pump for an internal-combustion engine, comprising: a vane cell pump including a rotor body with rotor blades radially displaced in the rotor body and a lifting ring whose position is adjustable with respect to the axis of rotation of the rotor to change an oil delivery volume as a function of operating parameters of the internal-combustion engine, an adjusting piston operatively linked to said lifting ring, and guided in a valve bore of a pressure regulating valve, wherein said adjusting piston is acted upon by engine oil pressure on a piston front side with the piston front side being connected with the piston rear side by way of a throttle bore in the adjusting piston; a pressure chamber on the adjusting piston rear side in which a spring element is located; and a hydraulic pipe connected to the pressure chamber and via a regulating valve to a suction side of the lubricant pump such that a delivery volume of the vane cell pump is variable as a function of an oil volume flow though the throttle bore, wherein, for an operating-point-dependent oil pressure control of the vane cell pump, a characteristic curve diagram is stored in a control unit, by means of which characteristic curve diagram, the oil pressure is defined as a function of the rotational speed, the engine oil temperature or the load condition of the internal-combustion engine.