Steering compensated speed override for vehicle drive system

Details Steering compensated speed override for vehicle drive system Steering compensated speed override for vehicle drive system

2008-06-10

2008-06-10

Keith, Jack (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S050000, C701S053000, C701S054000, C701S087000, C180S170000, C180S248000, C056S01020R, C477S107000

Reexamination Certificate

active

07386382

ABSTRACT:
A method of controlling a vehicle drive system is provided for a vehicle having an internal combustion engine, free-wheeling steerable front wheels, driven rear wheels, an infinitely variable transmission (IVT) transmitting torque from the engine to the rear wheels, and a control unit for controlling the IVT as a function of sensed parameters and supplying a speed command to the IVT for commanding a speed of the rear wheels. The method includes sensing a steering angle of the front wheels, sensing a front wheel speed, sensing a rear wheel speed, generating a corrected estimated vehicle speed as a function of the front wheel speed and the sensed steering angle, and increasing the speed command in response to a comparison between the corrected estimated vehicle speed and the rear wheel speed. The infinitely variable transmission is preferably embodied by a hybrid electric drive system. The estimated vehicle speed value is determined as a function of a gear ratio of a rear wheel drive, the front wheel speed, a rolling radius of the front wheel, a rolling radius of the rear wheel, and the steering angle of the steerable front wheels. The speed command is increased when the rear wheel speed is less than 90% of the corrected estimated vehicle speed.

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