Steering compensated speed override for vehicle drive system

A method of controlling a vehicle drive system (6) is provided for a vehicle having an internal combustion engine (8), free-wheeling steerable front wheels (7), driven rear wheels (26), an infinitely variable transmission (10, IVT) transmitting torque from the engine (8) to the rear wheels (26), and...

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Bibliographische Detailangaben
1. Verfasser:	SEKSARIA, ARUN K
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL INSTRUMENTATION OR DASHBOARDS FOR VEHICLES MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	A method of controlling a vehicle drive system (6) is provided for a vehicle having an internal combustion engine (8), free-wheeling steerable front wheels (7), driven rear wheels (26), an infinitely variable transmission (10, IVT) transmitting torque from the engine (8) to the rear wheels (26), and a control unit (30) for controlling the infinitely variable transmission (10) as a function of sensed parameters and supplying a speed command to the infinitely variable transmission (10) for commanding a speed of the rear wheels (26). The method includes sensing a steering angle of the front wheels (7), 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 (10) 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 (7), a rolling radius of the rear wheel (26), and the steering angle of the steerable front wheels (7). The speed command is increased when the rear wheel speed is less than 90% of the corrected estimated vehicle speed.