Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Reexamination Certificate
1999-06-28
2001-06-19
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
C318S432000, C318S266000
Reexamination Certificate
active
06249097
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method and a system for controlling the speed of a motor's output shaft as the torque or force imposed upon the shaft by the load being driven by the motor varies, and for controlling the output torque delivered by the shaft as the motor's speed drops to zero based upon the sensed output torque. This invention can be used to control an electric motor in a powered system of a motor vehicle.
BACKGROUND OF THE INVENTION
Many powered systems in motorized vehicles are controlled by permanent magnet electric motors. Examples include window lifts, sunroofs, sliding van doors, vehicle trunks, tailgates, and seat and seat back recliners and adjusters. The variability of certain parameters in many powered systems (e.g., the supply voltage, operating temperature, and the load driven by the motor) produces a variable speed vs. torque performance characteristic in the permanent magnetic electric motor used to power such a system, leading to undesirable variation in the powered systems' travel time, noise level, and sealing force. A control method and system is needed for optimizing the speed vs. torque performance characteristic of motors that drive powered systems in motor vehicles notwithstanding the variability of operating parameters in these systems.
SUMMARY OF THE INVENTION
The inventive method for controlling a motor driving a load is comprised of two phases. In the first phase, the speed of the motor's output shaft is held substantially constant as the torque imposed upon the output shaft by the load, and, therefore, the output torque of the motor, varies. In the second phase, the torque delivered by the motor's output shaft is controlled in a predetermined manner as the speed of the output shaft drops to zero.
The inventive method may be applied in an automotive or motor vehicle setting to any motor that drives a traveling component in a powered system. In the first phase of the inventive method, a traveling component is driven by the motor at a constant speed to some intermediate position. During this first phase, the output speed of the motor is held constant regardless of variations in operating environment parameters. In a second phase as the traveling component moves from the intermediate position to a second position, the output speed of the motor is continuously decreased and the output torque delivered by the motor's output shaft is controlled.
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Frey Mark
Mubaslat Saed M.
Pirrallo Karen M.
Wolff Kevin A.
Jacox Meckstroth & Jenkins
Ro Bentsu
Valeo Electrical Systems, Inc.
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