Power-assisted steering system
First Claim
1. A power-assisted steering system for a motor vehicle such as an automobile and truck for travel over a roadway, the vehicle including a wheel carrier assembly having wheels rotatably journalled thereon and a steering wheel assembly having a steering wheel on which forces act and to which a driver of the vehicle applies a steering wheel torque (mLR) when manipulating the steering wheel assembly for steering the vehicle, the wheels being subjected to mechanical reaction from the roadway travelled on by the vehicle, the power-assisted steering system comprising:
- a servo drive operatively connected to said wheel carrier assembly for articulating said wheels whereby an actuating torque (mLenk) is developed between said servo drive and said wheel carrier assembly;
steering wheel torque supply means for supplying a first signal indicative of the steering wheel torque (mLR);
actuating torque (mLenk) supply means for supplying a second signal indicative of said actuating torque (mLenk); and
,controller means receiving said first and second signals to form a control difference (rd) and for controlling said forces acting on said steering wheel to predetermined values while considering the mechanical reaction from the roadway.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
16 Citations
15 Claims
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1. A power-assisted steering system for a motor vehicle such as an automobile and truck for travel over a roadway, the vehicle including a wheel carrier assembly having wheels rotatably journalled thereon and a steering wheel assembly having a steering wheel on which forces act and to which a driver of the vehicle applies a steering wheel torque (mLR) when manipulating the steering wheel assembly for steering the vehicle, the wheels being subjected to mechanical reaction from the roadway travelled on by the vehicle, the power-assisted steering system comprising:
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a servo drive operatively connected to said wheel carrier assembly for articulating said wheels whereby an actuating torque (mLenk) is developed between said servo drive and said wheel carrier assembly; steering wheel torque supply means for supplying a first signal indicative of the steering wheel torque (mLR); actuating torque (mLenk) supply means for supplying a second signal indicative of said actuating torque (mLenk); and
,controller means receiving said first and second signals to form a control difference (rd) and for controlling said forces acting on said steering wheel to predetermined values while considering the mechanical reaction from the roadway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power-assisted steering system for a motor vehicle such as an automobile and truck for travel over a roadway, the vehicle including a wheel carrier assembly having wheels rotatably journalled thereon and a steering wheel assembly having a steering wheel on which forces act and to which a driver of the vehicle applies a steering wheel torque (mLR) when manipulating the steering wheel assembly for steering the vehicle, the wheels being subjected to mechanical reaction from the roadway travelled on by the vehicle, the power-assisted steering system comprising:
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a servo drive operatively connected to said wheel carrier assembly for articulating said wheels whereby an actuating torque (mLenk) is developed between said servo drive and said wheel carrier assembly; steering wheel torque supply means for supplying a first signal indicative of the steering wheel torque (mLR); actuating torque (mLenk) supply means for supplying a second signal indicative of said actuating torque (mLenk); controller means receiving said first and second signals to form a control difference (rd) and for controlling said forces acting on said steering wheel to predetermined values while considering the mechanical reaction from the roadway; a summing point connected to the input of said controller means; an evaluation circuit connected to said summing point; and
,said second signal being applied as an input to said evaluation circuit and said evaluation circuit being configured to supply a characteristic torque as an output variable to said summing point to form said control difference (rd). - View Dependent Claims (14, 15)
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Specification