Vehicle Steering Vibration Control via Height Sensor Feedback
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Solution Overview
Problem
Existing vehicle control systems face challenges in reducing steering vibration while providing proper assistance during steering, as methods to mitigate steering vibration often increase steering effort and fail to achieve simultaneous reduction of vibration and assistive torque.
Innovation Solution
A vehicle control system comprising a force generating mechanism, such as a semi-active shock damper, and a control portion that calculates and adjusts damping force based on vehicle height information to generate steering torque, reducing steering vibration and improving assistive steering through feed-forward control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If steering vibration is reduced by generating resistive torque against steering velocity, then steering vibration is reduced, but steering effort increases
Solution Approach 1:
The system converts harmful steering vibrations into useful information by detecting them through vehicle height sensors, then generates compensatory torque to cancel the vibrations while maintaining natural steering feel. The harmful vibration energy is transformed into a control signal that benefits steering stability without increasing driver effort
Solution Approach 2:
The system implements feedback control by continuously monitoring vehicle height information from sensors, calculating steering vibration components, and adjusting electric motor torque in real-time to counteract vibrations. This closed-loop feedback ensures vibration reduction while preserving normal steering characteristics and avoiding increased steering effort
2Ease of operation
If steering assist is provided through electric motor torque, then steering effort is reduced, but steering vibration from road surface is transmitted to steering wheel
Solution Approach 1:
The system segments steering torque into two independent components: assist torque that reduces steering effort and vibration compensation torque that cancels road-induced vibrations. By separating these functions and controlling them independently through signal processing, the system provides steering assist while filtering out harmful vibrations from being transmitted to the steering wheel
Solution Approach 2:
The control system acts as an intermediary between the road surface vibrations and the steering wheel, detecting vibrations through vehicle height sensors and generating compensatory torque signals that cancel vibrations before they reach the steering wheel, while simultaneously providing assist torque to reduce steering effort
Data Source
AI summary
A shock damper is disposed between a vehicle body side and a wheel side. A suspension control device calculates a damping force of the shock damper on the basis of vehicle height information and controls the damping force. A steering system includes an electric motor and a steering control device that controls the electric motor, and assists steering effort of the driver through the electric motor. The suspension control device calculates the vibration generated in a steering on the basis of a detected value of a vehicle height sensor and creates a signal for generating steering torque that reduces the generated vibration. The suspension control device outputs the created signal to the steering control device. Steering torque for cancelling steering vibration is accordingly outputted from the electric motor of the steering system.