Vehicle Traction Control Device for Terrain Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle traction systems, such as 4x2 and 4x4 vehicles, face limitations in managing varying terrain conditions and grip differences, with traditional anti-skid and limited-slip differential systems showing limited performance, especially in off-road situations and requiring high costs, increased complexity, and geometric integration challenges.
Innovation Solution
A control device that optimizes tire operating points based on available grip, using sensors and driver-selected modes, with distinct strategies for different terrains (normal road, muddy, sandy, snowy) and independent wheel torque control, allowing manual adaptation through a dashboard selector, integrated with an ESP system for enhanced traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anti-skid systems (ASR) are used to improve traction, then wheel slippage is limited through engine torque limitation and brake pressure distribution, but performance remains very limited in off-road driving situations due to the need to manage numerous compromises
Solution Approach 1:
The system dynamically adapts control parameters based on detected terrain conditions. The control device switches between different control modes (snow/ice, mud, sand, normal road) depending on the terrain type detected by sensors, allowing the traction control system to optimize its behavior for each specific condition rather than using a fixed control strategy
Solution Approach 2:
The system changes control parameters such as target slip rate and torque distribution based on terrain type. For example, different target slip rates are used for different terrains (lower for snow/ice, higher for mud/sand), and the differential torque distribution between wheels is adjusted according to the detected condition, enabling optimized traction performance across varying terrains
2Reliability
If four-wheel drive (4x4) systems are used to improve traction, then performance in terms of traction is significantly better, but the additional cost, significant additional mass, complexity of development and fine-tuning, and difficulty of geometric integration increase
Solution Approach 1:
The patent extracts the essential traction improvement function from complex mechanical 4x4 systems and implements it through a control-based approach on a 4x2 vehicle. By using independent wheel torque control and differential braking, the system achieves effective four-wheel traction without requiring a mechanical four-wheel drive transmission system
Solution Approach 2:
The system replaces mechanical four-wheel drive components with an electronic control system that uses the existing ESP braking system and engine torque control to distribute power to all four wheels independently. This substitution of mechanical complexity with electronic control achieves similar traction benefits while maintaining 4x2 vehicle simplicity
3Reliability
If limited-slip differential is used to improve traction, then rotation speeds of wheels are equalized under certain conditions, but traction is only slightly improved and performances are limited in conditions of greater left/right grip differences or low homogeneous grips
Solution Approach 1:
The system applies different control strategies to different wheels based on local conditions. Through independent wheel torque control and differential braking, each wheel can be optimized for its specific grip conditions, allowing the vehicle to handle situations with mixed traction surfaces (e.g., one wheel on ice, another on dry road) much better than traditional limited-slip differentials
Data Source
Figure 1~2
AI summary
The invention relates to a vehicle control device comprising: - means (10, 20, 30) for generating various control modes dependent on parameters concerned with the way in which the vehicle is moving such as, rotational speed of the wheels, yaw rate, lateral acceleration and longitudinal acceleration, pressure on the brake controls exerted by the driver, and a vehicle life situation mode chosen by the driver from various preestablished life situations corresponding to different types of road and terrain and different vehicle rolling conditions, - estimating means (40) for estimating the vehicle life situation, the device being configured to determine an optimum control mode (32, 34, 36, 38) from among the various control modes that can be generated by the device as a function of the estimated vehicle life situation and the life situation mode chosen by the driver.