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Control-system-and-method-for-a-flywheel-type-power-delivery-system

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Control system and method for a flywheel type power delivery system

Details

Inventors: Frank, Andrew A.;
Assignee: Aisin Seiki Kabushiki Kaisha (Kariya, JP)
Primary Examiner: Love; John J.
Assistant Examiner: Camby; Richard M.
Attorney, Agent or Firm: Banner, Birch, McKie & Beckett

An improved control system and method for controlling the operation of a flywheel type power delivery system, such as used in an automotive vehicle. A predetermined maximum vehicle speed limit dictates the operating speed range for the flywheel. Desirably, this speed range is as low as possible so as to minimize spin losses. Above a threshold vehicle speed of approximately 45 miles per hour, the flywheel is completely uncoupled from the system and vehicle propulsion is provided by direct coupling of the engine through the continuously variable ratio transmission (CVT) to the vehicle driving wheels.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a flywheel type power delivery system and control scheme therefor which maximizes the efficient "creation" and "management" of energy.
Another object of the invention is to provide such a system and control scheme which are well-suited for automotive applications.
These and other objects of the invention are accomplished by providing a method of controlling the operation of a flywheel type power delivery system having a flywheel, prime mover, and a continously variable ratio transmission (CVT) operatively coupled to the flywheel for delivering power to an output shaft.
A desired maximum output shaft speed limit is predetermined, and a desired flywheel operating speed range is then determined as a function of the output shaft speed limit.
The actual speed of the flywheel is measured, and the delivery of power from the prime mover to the flywheel is controlled as a function of measured flywheel speed to keep the speed of the flywheel within the predetermined range.
The invention also encompasses apparatus for carrying out the prescribed method, and the application of these principles to controlling a motor vehicle.

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