Back to results
US 5,295,737 AGranted
Electric motor-driven hydraulic pump
AssigneeRobert Bosch GmbH
InventorsVolker Epple, Michael Klose, Klaus Mueller, Wolfgang Maisch
Life of this patent
Estimating the term…
Abstract
Circuit provides maximum current to an electric motor for a hydraulic pump in a brake system for a brief time interval after the motor is switched on, and thereafter limits the current to a lower value which corresponds to the torque necessary for generating the pressure required in the system.
Claims5
A system for generating a required hydraulic pressure for brakes of a vehicle, said brakes being controlled by hydraulic pressure, said system comprising
- means for determining the required pressure,
- a hydraulic pump for generating said required pressure,
- an electric motor which immediately after switching on draws electric current up to a maximum current for driving said pump, said motor generating torque dependent on said current,
- means for switching on said motor,
- means for providing said motor with said maximum current for a predetermined time interval immediately after switching on and whenever an increase in hydraulic pressure is needed to generate said required pressure, and
- means for limiting said current between said time intervals to a fixed lower value which corresponds to the torque for maintaining the required hydraulic pressure.
3 more elements
Dependencies are inferred from the claim text.