Torque Distribution Control for Hybrid E-4WD Vehicles
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Solution Overview
Problem
Conventional E-4WD hybrid electric vehicles face inefficiencies in torque distribution between front and rear wheels, leading to suboptimal fuel efficiency and stability issues, particularly when driving on slippery surfaces or during sudden acceleration, due to fixed power distribution methods that fail to account for differences in wheel speed and driver intent.
Innovation Solution
A control method that dynamically adjusts torque distribution between front and rear wheels based on wheel speed differences, driver input, and handling conditions, determining modes such as 4WD or fuel efficiency optimization to optimize torque output from both the engine and driving motor, using sensors and control algorithms to calculate and control torque amounts for improved stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed power distribution method is used between engine and driving motor, then device complexity is reduced, but fuel efficiency deteriorates and torque distribution cannot adapt to different driving conditions
Solution Approach 1:
The patent implements dynamic torque distribution control that continuously adjusts the torque split between front wheels (engine) and rear wheels (driving motor) based on real-time wheel speed differences, driver acceleration requests, and handling conditions. This dynamic adjustment mechanism enables the system to adapt to varying driving conditions such as slippery surfaces, sudden acceleration needs, and different road friction coefficients, resolving the contradiction between adaptability and fixed control complexity.
2Reliability
If 4WD mode is activated to improve driving performance and stability, then handling and posture control improve, but fuel efficiency deteriorates
Solution Approach 1:
The patent dynamically changes the operational parameters of the torque distribution system by calculating optimal torque amounts for front and rear wheels based on wheel speed differences, driver acceleration requests, and handling conditions. The control algorithm adjusts torque distribution ratios in real-time, enabling the vehicle to maintain stability and handling performance while minimizing unnecessary 4WD engagement, thus improving fuel efficiency while preserving vehicle control.
3Power
If driving motor assists driving power in 4WD mode to provide sufficient torque, then driving power increases, but energy consumption increases
Solution Approach 1:
The patent implements a feedback-based torque distribution control system that continuously monitors wheel speed differences, driver acceleration requests, and handling conditions. Based on this feedback, the control algorithm calculates the optimal torque amount for the driving motor to assist the engine, ensuring sufficient driving power is delivered only when and where needed, thereby minimizing unnecessary electric energy consumption while maintaining required power output.
Data Source
AI summary
The present disclosure provides a control method for front and rear wheel torque distribution of an electric 4 wheel drive (E-4WD) hybrid electric vehicle. The control method includes: determining one of a fuel efficiency optimization mode and a 4WD mode from vehicle state information and driver's driving manipulation input information; calculating a driver request total torque amount; when the 4WD mode is determined, calculating a rear wheel torque amount for the 4WD; calculating a front wheel torque amount for the 4WD; calculating a front wheel engine torque amount for the 4WD; and controlling a torque output of an engine for front wheel driving and a torque output of a driving motor for rear wheel driving according to the calculated front wheel engine torque amount for 4WD and the calculated rear wheel torque amount for 4WD.