| 摘要 |
<p>A road vehicle power assisted steering system comprises a power assisted steering gear assembly (1) in which power assistance to the displacement of an output member of the steering gear is provided by an electric motor in response to a steering torque applied to an input member (2). Windings of the electric motor are switched from a power supply (10), to a resistive load, when the steering torque falls below a predetermined value so that any kinetic energy of the displaceable components of the steering gear is dissipated by the resistive load. When the magnitude of steering torque ceases to fall the motor windings are switched back to the power supply (10) to be ready to provide power assistance for another steering manouevre.</p> |
