Vehicle steering system

• US 6,041,882 A
• Filed: 02/19/1997
• Issued: 03/28/2000
• Est. Priority Date: 02/24/1996
• Status: Expired due to Term

• Current Assignee: Thyssenkrupp Presta Steertec GmbH (Thyssenkrupp AG)
• Original Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Moser, Martin, Bohner, Hubert
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): Lerner, Avraham H.
• Application Number:
  US08/802,602
• Time in Patent Office: 1,133 Days
• Field of Search: 180/402, 180/443, 180/444, 180/445, 180/446, 701/41, 701/42, 701/43, 701/44
• US Class Current: 180/402
• CPC Class Codes: B62D 5/0484 for reaction to failures, e.g. limp home
• CPC Class Codes: B62D 6/008 Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications

Abstract

In a steering system for the steered wheels of a vehicle having a steering device such as a steering wheel, a desired wheel angle position transmitter operatively connected to the steering device, a motorized actuating unit for steering the steered vehicle wheels, and a hand force controller operatively connected to the steering device for generating a steering device return force to be felt by a vehicle operator, the energization of the hand force controller is dependent on the sum of a first signal which depends on the actual position of the steering device and the vehicle speed and a second signal which depends on the rate of actuation of the steering device and the vehicle speed.

Claims

1. A steering system for the steered wheels of vehicles, comprising a steering means, a desired wheel angle position transmitter operatively connected to said steering means providing a desired wheel angle value, a motorized actuating unit controlled as a function of said desired wheel angle position value for the steering of said steered vehicle wheels, a hand-force control operatively connected to said steering means for the generation of a steering wheel hand force that can be felt at said steering means dependent on a signal sum comprising a first signal generated by a first signal-transmitter arrangement and dependent on the actual position of the steering means and on the speed of vehicle travel, and a second signal, generated by a second signal-transmitter arrangement dependent on the rate of actuation of said steering means and on the speed of vehicle travel, said first and second signal transmitter arrangements each generating, in the event of a fault, an output signal with a predetermined fixed value as it is provided during fault-free vehicle operation at high vehicle speeds and at large steering angles or rates of actuation of said steering means.

2. Steering system according to claim 1, wherein a third signal-transmitter arrangement is provided which generates a signal dependent on the actuating force of said actuating unit.

3. A steering system according to claim 1, wherein means are provided for limiting the hand force that can be generated by said hand force controller.