Vehicle Driving Force Control Using Tire Vertical Load Prediction
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Solution Overview
Problem
Existing vehicle wheel slip control methods, such as ABS and TCS, face challenges in effectively managing wheel slip and roll motion during vehicle turning due to delays in control cycles and inadequate feedback, leading to repeated wheel slip occurrences and performance degradation.
Innovation Solution
A method that involves real-time control of driving force by determining a torque upper limit based on vertical load information of tires and roll motion, using a controller to adjust the torque command and prevent wheel slip by limiting the driving force before slip occurs, thereby stabilizing lateral grip force and preventing rollover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional feedback control methods (ABS/TCS) are used to manage wheel slip, then wheel slip control is implemented, but control cycle delays and repeated wheel slip occurrences happen
Solution Approach 1:
The system performs preliminary action by predicting tire vertical loads and determining torque upper limits before wheel slip occurs. The controller continuously monitors vehicle state information (steering angle, vehicle speed, lateral acceleration) and predicts vertical load changes due to roll motion, then proactively adjusts torque commands to prevent slip rather than reacting after slip detection. This eliminates control cycle delays by shifting from reactive feedback to proactive predictive control.
2Power
If driving force is increased during vehicle turning, then propulsion performance is improved, but wheel slip occurs due to roll motion and lateral load transfer
Solution Approach 1:
The system dynamically changes the torque parameter based on predicted vertical load information. The controller determines a torque upper limit for each wheel based on real-time vertical load predictions, and adjusts the torque command to stay within this limit. This allows maximum driving force to be utilized without exceeding the friction limit, preventing wheel slip while maintaining optimal propulsion performance during turning maneuvers.
3Reliability
If roll motion and lateral load transfer are reduced through torque reduction control, then wheel slip is prevented, but driving force is unnecessarily limited
Solution Approach 1:
The system applies local quality by individually controlling torque for each wheel based on its specific vertical load conditions. Instead of uniformly reducing torque across all wheels, the controller calculates separate torque upper limits for left and right wheels based on their respective predicted vertical loads from roll motion analysis. This allows each wheel to operate at its optimal torque level, preventing slip on loaded wheels while maintaining driving force on wheels with sufficient vertical load.
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
This approach effectively prevents wheel slip and enhances wheel slip control performance by adjusting driving force in real-time based on tire vertical loads and roll motion, ensuring stable lateral grip force and preventing rollover, particularly in vehicles with a long distance between the center of gravity and roll center, like SUVs.
Implementation Method 1
behavior of the vehicles is finally limited due to frictional force on roads... frictional force between tires and a road... frictional force which a road may provide
Data Source
AI summary
A method for controlling driving force of a vehicle in which driving force of the vehicle is controlled by pre-reflecting vertical load information of tires in real time during turning of the vehicle, to solve repeated occurrence of wheel slip and wheel slip control performance degradation due to roll motion, includes determining, by a controller, a basic torque command in real time based on vehicle driving information obtained while driving of the vehicle, obtaining information related to left wheel and right wheel vertical loads in real time based on information collected by the vehicle, determining a torque upper limit from the real-time vertical load information, determining a final torque command limited so as not to exceed the determined torque upper limit from the real-time determined basic torque command, and controlling operation of a driving device in accordance with the determined final torque command.