Vehicle Drive Force Distribution Control for Energy Efficiency
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Solution Overview
Problem
Existing four-wheel drive vehicles have limitations in improving energy consumption efficiency, as they can only switch between engine 2WD, motor 2WD, and hybrid 4WD modes, restricting further enhancements in energy efficiency.
Innovation Solution
A vehicle with a main drive unit and a sub drive unit, each equipped with rotary electric machines, and a control unit that sets a driving force distribution ratio to minimize electric power loss based on vehicle speed and required driving force, allowing for optimized energy distribution between the two units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vehicle switches between engine 2WD mode, motor 2WD mode, and hybrid 4WD mode, then the energy consumption efficiency is improved, but the improvement is limited and cannot be further enhanced
Solution Approach 1:
The patent applies dynamics by continuously adjusting the driving force distribution ratio between the main drive unit and sub drive unit based on real-time operating conditions (vehicle speed, required driving force). Instead of discrete mode switching, the system dynamically optimizes the proportion of driving force from each unit, allowing for fine-grained control that continuously minimizes electric power loss across varying driving conditions.
Solution Approach 2:
The patent changes the parameter of driving force distribution ratio from fixed discrete modes to a continuously variable parameter. By adjusting this ratio based on vehicle speed and required driving force, the system can optimize energy consumption efficiency across a continuous range of operating conditions rather than being constrained to specific predefined modes.
2Use of energy by moving object
If the driving force distribution ratio is fixed in discrete modes, then the control system is simpler, but the energy consumption efficiency cannot be optimized further
Solution Approach 1:
The patent implements feedback control by continuously monitoring vehicle speed and required driving force, then using this information to adjust the driving force distribution ratio. The control unit receives feedback about actual operating conditions and dynamically adjusts the distribution to minimize electric power loss, creating a closed-loop control system that optimizes energy efficiency in real-time.
Solution Approach 2:
The control system transitions from static discrete mode selection to dynamic continuous adjustment. The driving force distribution ratio becomes a dynamic variable that changes continuously based on operating conditions, allowing the system to adapt optimally to varying driving requirements while maintaining manageable control complexity through systematic adjustment strategies.
Data Source
AI summary
A vehicle includes a main drive unit, a sub drive unit, and a control unit. The main drive unit includes a main drive rotary electric machine. The sub drive unit includes a sub drive rotary electric machine. The control unit includes a driving force distribution ratio setting unit configured to set a driving force distribution ratio between the main driving force and the sub driving force and is configured to control the outputs of the main drive unit and the sub drive unit so that the main driving force and the sub driving force have the driving force distribution ratio set by the driving force distribution ratio setting unit. The driving force distribution ratio setting unit is configured to set the driving force distribution ratio to minimize electric power loss of the vehicle based on a vehicle speed of the vehicle and a required driving force of the vehicle.