Robert Boschgmbh

Uwe Kirberg

Peter Ahner

Hubert Bischof

Peter Pfeffer

Herbert Labitzke

Peter Kleindieck

Ulrich-Eugen Konigorski

Willibert Schleuter

A method for assisting the steering forces to be produced in a vehicle by means of an electric motor acting on the steering column is proposed. This method is characterized in that the additional torque produced by the electric motor is controlled in dependence upon the steering torque to be produced for actuating the steering and upon the steering torque supplied overall. The additional torque is thus dependent on the torque which is produced at the steering wheel by the driver and, in addition, on the torque which is supplied by the steering arrangement on the wheels to be steered. The electric motor is controlled by a controller 5 via an actuator 6, an additional torque M*.sub.R, which is dependent on the vehicle speed, being input into the controller. As characteristic shaper, the controller has a dead-time element by which the control intervenes only from a certain limit value of the torque M*.sub.R input into the controller 5. This results in a particularly good contact with the roadway for the driver in combination with optimal assistance to the steering forces.

Method for assisting the steering forces to be produced in a vehicle

A power-assisted steering system for a vehicle such as an automobile or truck and having an electro-mechanical servo drive. The servo drive directs the wheels to be steered which are journalled on a wheel carrier assembly and coacts with a steering wheel of the vehicle. The steering system includes a controller to which a steering wheel torque and a steering torque are supplied for forming a control difference with the steering wheel torque being generated by the driver when steering. The steering torque is the actuating torque occurring between the servo drive and the wheel carrier and the forces developed on the steering wheel are controlled to pregiven values while considering the mechanical reaction.

Power-assisted steering system

Growing community of inventors

Markgroningen-Unterriexingen, Germany

Uwe Kirberg