A commercial vehicle power steering system with driver selectable electronically controlled efforts, designated by TRW as the X-4, was designed and tested on Class 8 trucks. The TRW X-4 system is a variable-flow power assist concept. Prototypes of the system proved successful in installations on highway line-haul tractors from several manufacturers. The X-4 system provides increased steering road feel at highway speeds, without a reduction in power assist at low speeds. In addition to enhanced steering and handling performance, test results indicate that the X-4 system significantly reduces the power consumption as compared to the production OEM power steering system.
Electronically Controlled Steering Systems for Line Haul Vehicles
Sae Technical Papers
SAE International Truck and Bus Meeting and Exposition ; 1987
1987-11-01
Conference paper
English
Electronically controlled steering systems for line haul vehicles
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