Method for operating a steering apparatus of a motor vehicle comprising an electromechanical steering-assistance device
First Claim
1. A method for operating a steering apparatus of a motor vehicle that includes an electromechanical steering-assistance device, the method comprising:
- detecting interference-induced vibrations which act on a torsion bar of the steering apparatus;
analyzing a frequency and amplitude of the interference-induced vibrations;
activating a steering-stabilization function of the steering-assistance device when a limit value for the amplitude of the interference-induced vibrations is exceeded;
providing, by the steering stabilization function, a drive signal (AS) for an electric motor of the steering-assistance device, so that the electric motor generates a compensation torque Mbar which acts on the torsion bar and at least partially counteracts the interference-induced vibrations;
forming an indicator (I) from the frequency and the amplitude of the interference-induced vibrations;
distinguishing carriageway-induced vibrations from vibrations caused by instabilities in the steering apparatus; and
generating the drive signal (AS) for the electric motor in a vibration-dependent manner by combining the indicator (I) with the steering-stabilization functionwherein the frequency and amplitude of a torsion bar torque (MDS) of the torsion bar of the steering apparatus are determined so as to form the indicator (I), andwherein the torsion bar torque (MDS) is differentiated, and zero crossings in the derivative of the torsion bar torque (MDS) are detected, the frequency of the vibrations of the torsion bar being calculated from said zero crossings, and also the maximum of a magnitude of the derivative of the torsion bar torque (MDS) is determined, and the indicator (I) is formed by combining the frequency with the maximum of the magnitude of the derivative of the torsion bar torque (MDS).
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Accused Products
Abstract
A method for operating a steering apparatus of a motor vehicle includes detecting interference-induced vibrations which act on a torsion bar of the steering apparatus and analyzing a frequency and amplitude of the interference-induced vibrations. A steering-stabilization function of the steering-assistance device is activated when a limit value for the amplitude of the interference-induced vibrations is exceeded. A drive signal is provided, with the steering stabilization function, for an electric motor of the steering-assistance device, so that the electric motor generates a compensation torque Mbar which acts on the torsion bar and at least partially counteracts the interference-induced vibrations. An indicator is formed from the frequency and the amplitude of the interference-induced vibrations and the carriageway induced vibrations are distinguished from vibrations caused by instabilities in the steering apparatus. The drive signal is generated for the electric motor in a vibration-dependent manner by combining the indicator with the steering-stabilization function.
3 Citations
9 Claims
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1. A method for operating a steering apparatus of a motor vehicle that includes an electromechanical steering-assistance device, the method comprising:
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detecting interference-induced vibrations which act on a torsion bar of the steering apparatus; analyzing a frequency and amplitude of the interference-induced vibrations; activating a steering-stabilization function of the steering-assistance device when a limit value for the amplitude of the interference-induced vibrations is exceeded; providing, by the steering stabilization function, a drive signal (AS) for an electric motor of the steering-assistance device, so that the electric motor generates a compensation torque Mbar which acts on the torsion bar and at least partially counteracts the interference-induced vibrations; forming an indicator (I) from the frequency and the amplitude of the interference-induced vibrations; distinguishing carriageway-induced vibrations from vibrations caused by instabilities in the steering apparatus; and generating the drive signal (AS) for the electric motor in a vibration-dependent manner by combining the indicator (I) with the steering-stabilization function wherein the frequency and amplitude of a torsion bar torque (MDS) of the torsion bar of the steering apparatus are determined so as to form the indicator (I), and wherein the torsion bar torque (MDS) is differentiated, and zero crossings in the derivative of the torsion bar torque (MDS) are detected, the frequency of the vibrations of the torsion bar being calculated from said zero crossings, and also the maximum of a magnitude of the derivative of the torsion bar torque (MDS) is determined, and the indicator (I) is formed by combining the frequency with the maximum of the magnitude of the derivative of the torsion bar torque (MDS). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification