Anti-rollback system for an electric motor and method therefor
AssigneeLiber-T Medtech Inc.
InventorsEric Gagnon, Thomas Cliche
Life of this patent
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Abstract
The present method and system allows minimization of a rollback effect when an electric vehicle, such as a wheelchair, brakes on a slope. The system comprises secondary brake, a controller, and a monitor that allows to apply both a control voltage and the secondary brakes according to an appropriate sequence to provide stops and starts with a minimized rollback effect. An updated armature resistance value is advantageously used to take into account evolutive conditions of the vehicle.
Claims3
A method for managing stops of a wheel driven by an electric motor using a secondary brake, said method comprising:
- providing the secondary brake application time;
- upon receiving a stop triggering signal:
- controlling the electric motor so as to bring the wheel to a stop;
- applying said secondary brake;
- waiting at least a period of time corresponding to said secondary brake application time while collecting data related to the voltage applied during the braking and removing voltage from the electric motor,;
- and
- upon receiving a start triggering signal:
- using said collected data to apply on the electric motor about said voltage applied during braking;
- removing said secondary brake;
- and
- controlling the electric motor so as to bring power to the wheel.
A system for managing stops of a wheel driven by an electric motor, said system comprising:
- a controller to be connected to the electric motor;
- a secondary brake for selectively stopping the wheel;
- said secondary brake having a brake application time;
- a monitoring device connected to both said controller and the electric motor;
- said controller being configured for,
- upon receiving a stop triggering signal:
- controlling the electric motor so as to bring the wheel to a stop;
- applying said secondary brake;
- waiting at least a period of time corresponding to said secondary brake application time while collecting data related to the voltage applied during the braking and removing voltage from the electric motor;
- and
- upon receiving a start triggering signal:
- using said collected data to apply on the electric motor about said voltage applied during braking;
- removing said secondary brake;
- and
- controlling the electric motor so as to bring power to the wheel.
Dependencies are inferred from the claim text.