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Lanchester in the UK,in February 1902. His invention was to cause the steering mechanism to be actuated by hydraulic power. The next design was filed as recorded by the US Patent Office on August 30, 1932, by Klara Gailis, from Belmont, Massachusetts. There is another inventor credited with the invention of power steering by the name of Charles F. Hammond an American, born in Detroit, who filed similar patents, the first of which was filed as recorded by the Canadian Intellectual Property Office. Chrysler Corporation introduced the first mercially available power steering system on the 1951 Chrysler Imperial under the name Hydraguide. Most new vehicles now have power steering, owing to the trends toward front wheel drive, greater vehicle mass, and wider tires, which all increase the required steering effort. Heavier vehicles as mon in some countries would be extremely difficult to maneuver at low speeds, while vehicles of lighter weight may not need power assisted steering at all Hydraulic systems A power steering fluid reservoir and pulley driven pump Most power steering systems work by using a hydraulic system to turn the vehicle39。 the bottom end will not rotate as far as the top end. The difference in rotation between the top and bottom ends of the torsion bar can be used to control the valve that allows fluid to flow to the cylinder which provides steering assistance。s speed increases (this is known as variable assist power steering). DIRAVI In the DIRAVI system invented by Citro235。n SM in 1970, and was known as 39。 in the . While DIRAVI is not the mechanical template for all modern power steering arrangements, it did innovate the now mon benefit of speed adjustable steering. The force of the centering device increases as the car39。 in the UK and 39。s high pressure hydraulic system and is always the same no matter what the road speed is. As the steering wheel is turned, the wheels are turned simultaneously to a corresponding angle by a hydraulic piston. In order to give some artificial steering feel, there is a separate hydraulically operated system that tries to turn the steering wheel back to centre position. The amount of pressure applied is proportional to road speed, so that at low speeds the steering is very light, and at high speeds it is very difficult to move more than a small amount from the centre position. As long as there is pressure in the car39。s output back to the hydraulic reservoir at high engine speeds. A pressure relief valve is also used to prevent a dangerous buildup of pressure when the hydraulic cylinder39。s engine. A do