Superimposed Steering System for Trailer Coupling Precision
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Solution Overview
Problem
Existing reversing assistance systems for vehicles often require the driver to focus intensely on steering, leading to potential hazards from overlooking surroundings during reversing maneuvers, especially when precision is required, such as in parallel parking or trailer coupling, and can strain the driver's concentration.
Innovation Solution
A method and system utilizing sensor arrangements (ultrasonic, radar, and/or camera systems) to monitor the rear environment, calculate a target steering angle, and adjust the transmission ratio of a superimposed steering system to assist the driver in reversing without fully taking over steering control, allowing the driver to maintain attention on surroundings while ensuring accurate positioning and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver steers the vehicle manually during reversing maneuvers, then the driver can maintain awareness of surroundings, but the precision of positioning the vehicle relative to the target (trailer hitch or parking space) deteriorates
Solution Approach 1:
The patent introduces a superimposed steering system as an intermediary between the driver's steering input and the actual wheel steering. This mediator automatically adjusts the steering angle based on sensor data and calculated trajectories, while the driver retains control through the steering wheel. The system thus bridges the gap between manual control awareness and automated positioning precision.
Solution Approach 2:
The system dynamically changes the transmission ratio parameter of the steering system. When reversing assistance is activated, the transmission ratio is adjusted to provide enhanced steering response and precision. The patent modifies steering parameters automatically based on vehicle state and target position, enabling precise positioning without requiring the driver to constantly adjust steering input.
2Manufacturing precision
If a superimposed steering system automatically adjusts steering angle, then positioning precision improves, but the driver's concentration is strained and potential hazards may be overlooked
Solution Approach 1:
The superimposed steering system is designed to be dynamic rather than fully automated. It continuously adapts its level of intervention based on driver input and vehicle state. The system remains active and adjustable during the maneuver, allowing the driver to override or modify automated steering as needed, thus maintaining situational awareness while benefiting from automated precision.
Solution Approach 2:
The system provides continuous feedback to the driver through the steering wheel connection and visual displays showing the calculated trajectory and actual vehicle position. This feedback loop allows the driver to monitor the automated steering actions and remain aware of the vehicle's movement relative to the target, preventing complete disengagement from the maneuver.
3Manufacturing precision
If ultrasonic sensors and superimposed steering are used for automated coupling, then coupling precision improves, but the device complexity and cost increase
Solution Approach 1:
The superimposed steering system is designed to perform multiple functions: it assists during trailer coupling maneuvers, supports reverse parking operations, and provides general reversing assistance. By using the same hardware infrastructure (steering wheel connection, sensors, control unit) for multiple applications, the patent reduces overall system complexity compared to having separate dedicated systems for each function.
Solution Approach 2:
The system segments the steering control into independent functional modules: sensor arrangements for environment detection, processing units for trajectory calculation, and actuation through the superimposed steering mechanism. This modular segmentation allows for easier installation, maintenance, and potential customization, reducing the perceived complexity of the overall system.
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
The system supports the driver by enabling precise reversing maneuvers without excessive concentration on steering, enhancing safety and comfort by allowing the driver to focus on potential hazards while the system adjusts steering to reach the target position, ensuring successful reversing and reducing the risk of accidents.
Implementation Method 1
ultrasonic sensors, which are designed as transmitting and receiving units, are attached both to the motor vehicle and to a drawbar of a trailer
Implementation Method 2
radar and/or video sensor systems, are known, with which the surroundings of a vehicle can be monitored
Data Source
Figure 1~2
AI summary
The method involves monitoring a rear environment of a vehicle (10) and defining a object (100) i.e. trailer's drawbar tip, in the environment. A position (101) of the object is determined relative to the vehicle. A target turning angle (32) of the vehicle is calculated for reaching the object during a reverse movement. A steering wheel angle (30) predetermined by a driver is determined. A transmission ratio of a superimposed steering system (12) between the steering wheel angle and a turning angle (31) of the vehicle is adjusted for adjustment of the turning angle to the target turning angle. An independent claim is also included for a back driving assist system for a vehicle.