Active Steering Torque Compensation for Driver Comfort
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Solution Overview
Problem
Active steering systems in advanced driver assistance systems (ADAS) can unexpectedly seize control of the steering wheel, causing discomfort and risk of losing vehicle control, as they intervene in the driver's steering without proper torque compensation.
Innovation Solution
A system and method for active steering control with automatic torque compensation, incorporating an active steering assistance device, torque sensor, processor, system-related compensator, and electric motor, which generates a steering torque signal by overlaying a targeted torque signal on the driver's torque signal, allowing the processor to perform an assistance logic algorithm and compensate for vehicle-dependent factors to assist the driver's steering without interfering with their control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ADAS system abruptly seizes control of the steering wheel to perform active steering, then the collision prevention function is improved, but the driver's comfort and vehicle control stability deteriorate
Solution Approach 1:
The system applies preliminary anti-action by detecting the driver's steering torque in advance and using it to compensate for the abrupt torque changes that would occur during active steering intervention. The processor calculates a compensation torque based on the driver's initial steering torque and applies it to offset the harsh torque changes, thereby maintaining driver comfort and vehicle control stability while still enabling collision prevention functionality.
Solution Approach 2:
The system implements feedback by continuously monitoring the driver's steering torque through the torque sensor and using this information to dynamically adjust the electric motor's torque output. The processor receives the driver's torque signal, calculates the necessary compensation, and adjusts the assistance torque in real-time to ensure smooth transitions and maintain stable vehicle control during active steering operations.
2Extent of automation
If the ADAS system intervenes in the driver's steering behavior to adjust the turning angle, then the active steering function is improved, but the driver may be scared and cause the vehicle to become uncontrollable
Solution Approach 1:
The system applies the counterweight principle by using the electric motor to generate compensation torque that counteracts the abrupt torque changes during active steering intervention. The processor calculates a compensation torque signal based on the driver's steering torque and applies it to offset the harsh torque changes, thereby maintaining driver comfort and preventing the driver from being scared or losing control of the vehicle.
Solution Approach 2:
The system uses the electric motor as an intermediary between the ADAS control system and the steering wheel. Instead of directly seizing control of the steering wheel, the electric motor smoothly transmits the torque changes, acting as a buffer that mediates between the automated steering control and the driver's steering input, thereby preventing sudden and frightening torque changes.
3Speed
If the processor directly controls the electric motor according to the steering assistance signal, then the active steering response speed is improved, but the steering assistance may interfere with and resist the driver's steering motion
Solution Approach 1:
The system merges the driver's steering torque with the active steering assistance torque by overlaying the targeted torque signal on the driver's torque signal. The processor combines both torque inputs to generate a combined steering torque signal, ensuring that the electric motor's assistance torque works together with the driver's steering motion rather than resisting it, thereby maintaining smooth and natural steering feel.
Solution Approach 2:
The system applies dynamics by making the torque compensation adjustable and adaptive. The processor dynamically adjusts the compensation torque based on real-time detection of the driver's steering torque and the current steering state. This dynamic adjustment ensures that the electric motor's assistance smoothly integrates with the driver's steering motion at all times, preventing interference or resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the driver to easily and stably control the vehicle during active steering operations by ensuring that the steering assistance does not resist the driver's motion, thereby reducing the risk of vehicle loss of control and enhancing safety.
Implementation Method 1
a torque sensor (12), a processor (13), a system-related compensator (14), and an electric motor (15)... The torque sensor generates a driver's torque signal
Implementation Method 2
The electric motor is electrically connected to the system-related compensator. The system-related compensator controls a driving current for the electric motor
Data Source
AI summary
A system and a method for active steering control with automatic torque compensation are disclosed with a processor that generates a targeted torque signal after receiving a steering assistance signal generated by an active driver assistance device, overlays the targeted torque signal on a driver's torque signal after receiving the driver's torque signal sensed by a torque sensor to generate a steering torque signal, and performs an assistance logic algorithm according to the steering torque signal. As the assistance logic algorithm is performed based on both the steering assistance signal and the driver's torque signal, the steering assistance effect provided by the system and the method will not resist against the way of driver's steering, allowing the driver to easily and stably control the vehicle.