Torque Distribution Control for Towing Stability
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Solution Overview
Problem
Four-wheel drive vehicles using front wheels as main drive wheels experience slip during towing due to a decrease in ground load, leading to a rearward-inclining posture and increased likelihood of front wheel slip.
Innovation Solution
A driving force distribution control system that dynamically adjusts the torque distribution between front and rear wheels by increasing the driving force to the rear wheels when towing, using a processor to determine towing conditions and adjust the distribution ratio based on factors like acceleration and towed vehicle weight, thereby reducing the load on front wheels and preventing slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle uses front wheels as main drive wheels and tows a towed vehicle, then the towing capability is improved, but the ground load on front wheels decreases causing slip
Solution Approach 1:
The patent implements dynamic adjustment of driving force distribution between front and rear wheels based on detected towing conditions. The control device monitors acceleration, steering angle, and other parameters to determine towing state, then dynamically redistributes torque to maintain front wheel ground load and prevent slip during towing operations.
Solution Approach 2:
The system changes the driving force distribution parameter (torque ratio between front and rear wheels) in response to detected towing conditions. When towing is detected, the system increases the driving force distribution to rear wheels, thereby reducing the torque demand on front wheels and preventing slip caused by decreased ground load.
2Reliability
If the driving force distribution is adjusted to prevent front wheel slip during towing, then the traction stability is improved, but the complexity of the control system increases
Solution Approach 1:
The control device performs multiple functions: it monitors vehicle acceleration, detects steering input, determines towing conditions, and adjusts driving force distribution. By consolidating these functions in a single control unit that processes multiple sensor inputs, the system achieves complex control objectives without proportionally increasing overall system complexity.
Solution Approach 2:
The system continuously monitors vehicle state parameters (acceleration, steering angle, wheel speeds) and uses this feedback to dynamically adjust driving force distribution. This closed-loop control enables automatic adaptation to towing conditions without requiring complex manual intervention or overly sophisticated control architecture.
Data Source
AI summary
A driving force distribution control system for a four-wheel drive vehicle is provided. The four-wheel drive vehicle uses front wheels as main driving wheels, and when a towed vehicle is coupled to a coupling part provided to a rear part of the four-wheel drive vehicle, the towed vehicle has the center of gravity position so that a downward load in a vehicle up-and-down direction is applied to the rear part of the vehicle through the coupling part. A driving force distribution control device includes a towing determination module configured to determine whether the vehicle is towing the towed vehicle, and when it is determined that the vehicle is towing the towed vehicle, a driving force distribution control device controls the driving force distributing device so that the driving force distributing amount to rear wheels becomes larger than that when the four-wheel drive vehicle is not towing the towed vehicle.