Electric pump actuator, stepless transmission with electric pump actuator and control method for an electric pump actuator

Abstract

The invention relates to an electric pump actuator (1) for a stepless transmission (2), the electric pump actuator having: a gear pump (3) with two meshing gearwheels (4, 5), wherein the first gearwheel (4) and the second gearwheel (5) may each be actuated independently of the other via at least one electric motor (6, 7); and an electronic control unit (8) for controlling the at least one first electric motor (6), which is designed to transfer a first torque (M1) to the first gearwheel (4), and for controlling the at least one second electric motor (7), which is designed to transfer a second torque (M2) to the second gearwheel (5). The electronic control unit (8) controls the first electric motor (6) and the second electric motor (7) in such a manner that, particularly in the area in whichthe gearwheels (4, 5) mesh, the force resulting from the second torque (M2) is opposed to the force resulting from the first torque (M1) in at least one angle of rotation segment (9). Additionally, the invention relates to a stepless transmission (2) having at least one electric pump actuator (1) and a control method for the control of an electric pump actuator (1) in accordance with the coordinated claims.

Description

technical field [0001] The invention relates to an electric pump actuator (EPA) for a continuously variable transmission (Continuously Variable Transmission - CVT) in a motor vehicle, for example for (CVT) transmission regulation or for pressure regulation, the electric pump actuator having gears Pumps, gear pumps with two meshing gears, in particular the gears of external gear pumps, preferably with straight, helical or helical toothing, wherein the first and second gears can be moved independently of each other Actuated by at least one, preferably bidirectional, electric motor, and the electric pump actuator is provided with an electronic control unit (Electronic Control Unit, ECU) for controlling at least one first electric motor and at least one second electric motor, the first electric The motor is configured to transmit a first torque to the first gear, and the second electric motor is configured to transmit a second torque to the second gear. Furthermore, the invention...

AI Technical Summary

Problems solved by technology

The first gear thus turns independently of the second gear, however there are still problems with possible leaks and pressure instability and oscillations

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