Abstract: A road vehicle steering system which is adapted to use measurements and estimates characterising the motion of and forces acting on the vehicle and the steering system such as to derive an estimate of steering system disturbance force and to then use the latter estimate to establish a torque demand for the vehicle electronic power steering (EPS) which substantially compensates for this disturbance force.

Abstract: A pilot operated electromagnetically actuated valve having a flexible diaphragm main valve operator with a rigid insert forming the pilot valve seat and passage. The pilot valving chamber cover serves as an armature pilot valve guide and also has plural spaced ribs engaging and guiding movement of the rigid insert and pilot valve seat. A separate inlet passage having an annular filter formed by circumferentially spaced grooves and a resilient flange provided on a disc member inserted in the valve inlet flow to a remote pilot bleed hole in the cover for supplying the pilot valving chamber.