Dual Super-Capacitor Energy Allocation for EV Slope Braking
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Solution Overview
Problem
Existing dual-motor electric vehicles with a single energy system do not optimize energy storage and recovery based on the difference in recovered energy amounts of front and rear wheels in varying terrains, leading to inefficient energy allocation and potential waste.
Innovation Solution
Implementing two super-capacitors, one for each wheel, and an energy control device that predicts terrain conditions using an electric horizon system to optimize power allocation based on the mechanical properties of the wheels, calculating the allocation proportion of braking forces to match energy recovery with terrain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single energy system (battery and super-capacitor) is used for both front and rear motors, then the device complexity is reduced, but the energy recovery efficiency is not optimized due to inability to account for terrain-specific energy recovery differences
Solution Approach 1:
The single energy system is segmented into two independent super-capacitor systems, with the first super-capacitor dedicated to the front motor and the second super-capacitor dedicated to the rear motor. This segmentation allows each super-capacitor to independently manage energy recovery for its respective motor based on terrain conditions, thereby optimizing energy recovery efficiency without requiring a complete redesign of the energy system architecture
Solution Approach 2:
Each super-capacitor is configured with terrain-specific energy recovery characteristics, where the first super-capacitor handles energy recovery for the front motor and the second super-capacitor handles energy recovery for the rear motor. This local quality approach allows the system to adapt energy allocation to specific terrain conditions affecting each axle, maximizing energy recovery efficiency in varying driving environments
2Loss of energy
If power output from super-capacitor to front and rear wheels is set at identical or fixed ratio, then the control system is simplified, but energy storage space cannot be optimized during energy recovery
Solution Approach 1:
The energy allocation system transitions from a static fixed-ratio distribution to a dynamic allocation mechanism. The energy control device continuously monitors terrain conditions, vehicle state, and super-capacitor charge levels to dynamically adjust the power output ratio between front and rear super-capacitors. This dynamic adjustment enables optimal energy storage space utilization during energy recovery while adapting to varying driving conditions
Solution Approach 2:
The energy control device implements a feedback mechanism that monitors the charge levels of both super-capacitors, the vehicle's driving state, and terrain information. Based on this feedback, the system automatically adjusts the power allocation ratio to optimize energy recovery. The feedback loop ensures that energy storage space is efficiently managed by preventing overcharge conditions while maximizing energy capture from regenerative braking
3Duration of action of moving object
If the same energy system supplies power to both motors simultaneously, then the system structure is simplified, but the endurance mileage cannot be maximized despite using dual-motor technology
Solution Approach 1:
The energy system is segmented into two independent super-capacitor units, each dedicated to one motor. This segmentation allows each super-capacitor to be optimized for its specific motor's power demands and regenerative braking characteristics, thereby maximizing the overall endurance mileage of the dual-motor system while maintaining manageable system complexity
Solution Approach 2:
The energy control device performs preliminary action by predicting future energy needs based on terrain information and vehicle state. It proactively allocates power from the appropriate super-capacitor before energy demands arise, ensuring optimal energy availability for both motors throughout the journey and thereby extending the vehicle's endurance mileage
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
Enhances energy recovery efficiency by optimizing super-capacitor usage, ensuring matched energy storage and minimizing waste, thereby increasing the electric vehicle's endurance mileage and economic efficiency.
Implementation Method 1
a first super-capacitor and a second super-capacitor are set on the basis that a battery supplies power for or recovers power from a front wheel driving device and/or a rear wheel driving device
Implementation Method 2
the super-capacitor is added in addition to the battery, thus the characteristics of high energy recovery efficiency and applicability to large-current output of the super-capacitor can be implemented
Data Source
AI summary
The present invention discloses an optimized energy allocation method and system for an electric vehicle and an electric vehicle. The method includes step (1) detecting remaining charge levels of a first super-capacitor and a second super-capacitor, determining whether the remaining charge levels of the first super-capacitor and the second super-capacitor are greater than a preset threshold value, and if so, proceeding to step (2); step (2) acquiring a topographic map of a road ahead by means of an electric horizon system, predicting whether there is a continuous slope ahead, and if so, proceeding to step (3); and step (3) according to a continuous slope value ahead, predicting a braking force allocation proportion when carrying out braking ahead, allocating current power outputs of the first super-capacitor and the second super-capacitor in advance according to the braking force allocation proportion, and returning to step (1).