Vehicle steering correction system

Details Vehicle steering correction system Vehicle steering correction system

B - Operations, Transporting

62

D

B62D 6/04 (2006.01)

Patent

CA 2210954

The correction system of this invention simulates a power steering leak which the driver can manually adjust or automatically tune to offset vehicle drift and/or pull generated by road crown, wind, vehicle alignment, and tires during straight ahead driving. The drift and pull correction system taps into the bypass line of a vehicle's power steering system and can be added to the vehicle as an aftermarket device. For example, the standard rack or power gear, the power steering pump and reservoir and the steering assembly of the power steering system can be used in combination with the addition of correction lines and correction valves of the steering correction system to correct the vehicle's steering system for "straight ahead driving" without operator assistance. The magnitude of the drift and/or pull is a direct function of the magnitude of the leak and the back (parasitic) pressure in the system. The correction system bypasses hydraulic fluid to one side of the power steering piston causing the steering system to input a steer angle change to the wheels until the added steering force generated on the vehicle is adequate to balance the forces and moments generated during straight ahead driving.

Cette invention concerne un dispositif compensateur de dérive qui simule une fuite de servodirection que le conducteur peut régler manuellement ou moduler automatiquement pour maintenir la trajectoire appropriée malgré l'effet perturbateur du bombement de la chaussée, du vent, du dérèglement du train avant et de l'usure ou du gonflement inégal des pneumatiques. Le dispositif compensateur se monte sur la conduite de dérivation du circuit de servodirection et peut être installé en rattrapage. Par exemple, la crémaillère ou le pignon de commande standard, la pompe de servodirection, le réservoir de servodirection et la tringlerie de servodirection peuvent être équipés en rattrapage de conduites et de soupapes de compensation permettant de maintenir, en ligne droite, une trajectoire appropriée sans intervention du conducteur. L'amplitude de la dérive est directement proportionnelle à l'importance de la fuite et de la contre-pression (parasite) dans le circuit. Le dispositif compensateur dévie le fluide hydraulique vers un côté du piston de servodirection pour modifier l'orientation des roues jusqu'à ce que l'effort ainsi produit équilibre les forces et moments perturbateurs en conduite en ligne droite.

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