Power steering
AssigneeTRW LucasVarity Electric Steering Ltd.
InventorDavid Michael Penketh
Life of this patent
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Abstract
In an electric power assisted steering system a power stage (2) is provided comprising at least a first conducting means (4), and a control stage (1) is provided comprising a second separate conducting means (5) adapted to carry one or more electrical components of a control circuit. Each conducting means comprising one or more conductive tracks or links (10) for carrying current to and/or from components of the electric power assisted steering system.
Claims10
An electric power assisted steering system for a vehicle having a steering wheel and a road wheel, wherein the system comprises a motor, a gearbox, a first portion adapted to be operatively connected to said steering wheel, a second portion adapted to be operatively connected to said road wheel, a torque sensor adapted to provide an output signal indicative of the torque in said first portion, an electrical circuit adapted to process said output signal from said torque sensor to produce a drive signal for said motor connected through said gearbox to said second portion, and a control circuit including at least one electric component, wherein said electrical circuit comprises a power stage which comprises at least a first conducting means and a control stage comprising a second separate conducting means adapted to carry said electrical component of said control circuit, each said conducting means comprising at least one conductive track for carrying current to and/or from components of said electric power assisted steering system, and wherein an electromagnetic shield is provided between said first and second conducting means.
Dependencies are inferred from the claim text.