Electric Vehicle Energy Recovery Torque Switching for Maximum Regeneration
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Solution Overview
Problem
Existing energy recovery control methods for electric vehicles fail to achieve maximum energy recovery, as they cannot effectively combine coasting and braking energy recovery modes to optimize energy conversion and storage.
Innovation Solution
A method and apparatus that determine whether an electric vehicle is in coasting or braking energy recovery mode, acquire the corresponding energy recovery torque, and send it to the motor controller to charge the battery, allowing for the combination of both modes to maximize energy recovery by superimposing braking energy recovery torque on coasting energy recovery torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric vehicle uses traditional braking energy recovery control methods, then the system structure remains simple, but the energy recovery efficiency cannot reach maximum
Solution Approach 1:
The patent segments the energy recovery control into two distinct modes: coasting energy recovery mode and braking energy recovery mode. The controller identifies the current mode based on driving state parameters (brake pedal opening degree, accelerator pedal opening degree, vehicle speed) and applies different control strategies for each mode. This segmentation allows the system to optimize energy recovery efficiency for each specific scenario without requiring a completely complex unified control system.
Solution Approach 2:
The patent implements dynamic mode switching between coasting and braking energy recovery based on real-time driving state parameters. The controller continuously monitors brake pedal opening degree, accelerator pedal opening degree, and vehicle speed to dynamically determine which energy recovery mode to activate. This dynamic adaptation enables the system to achieve maximum energy recovery efficiency across varying driving conditions without requiring overly complex predetermined control logic.
2Productivity
If the electric vehicle combines both coasting and braking energy recovery modes, then the energy recovery performance improves, but the control difficulty increases
Solution Approach 1:
The patent performs preliminary classification of energy recovery modes before executing the actual energy recovery control. The controller first evaluates driving state parameters (brake pedal opening degree, accelerator pedal opening degree, vehicle speed) to pre-determine whether the vehicle is in coasting mode or braking mode. This preliminary action simplifies subsequent control by establishing clear mode boundaries and decision criteria, reducing the overall control difficulty despite combining multiple recovery modes.
Solution Approach 2:
The patent implements feedback control by continuously monitoring driving state parameters and adjusting the energy recovery mode accordingly. The controller receives real-time data on brake pedal opening degree, accelerator pedal opening degree, and vehicle speed, compares these against predefined thresholds, and switches between coasting and braking energy recovery modes based on the current state. This feedback mechanism automates the complex detection and switching process, making the combined mode system manageable and reliable.
3Loss of energy
If the electric vehicle uses coasting energy recovery mode, then the energy recovery torque can be superimposed with braking energy recovery torque, but the system requires more complex mode identification
Solution Approach 1:
The patent applies different control characteristics to different energy recovery modes. In coasting energy recovery mode, the system allows torque superposition with braking energy recovery when conditions permit, creating a localized optimization zone. The controller identifies coasting mode through specific parameter combinations (low brake pedal opening degree, low accelerator pedal opening degree, appropriate vehicle speed range) and applies enhanced torque recovery only in this local condition, rather than uniformly across all operating states. This local quality approach reduces overall system complexity by limiting complex control to specific scenarios.
Solution Approach 2:
The patent uses parameter threshold changes to identify and switch between energy recovery modes. The controller monitors key parameters (brake pedal opening degree, accelerator pedal opening degree, vehicle speed) and changes the energy recovery strategy based on whether these parameters exceed or remain below predefined thresholds. This parameter-based approach simplifies mode identification compared to complex algorithmic analysis, as it relies on straightforward threshold comparisons of readily available sensor data.
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 enables better energy recovery performance by determining the energy recovery mode and calculating the energy recovery torque, ensuring stability and safety while maximizing energy conversion and improving the driving range of electric vehicles.
Implementation Method 1
this wasted motion energy can be converted into electrical energy through braking energy recovery technology and stored in the battery
Implementation Method 2
converted into electrical energy through braking energy recovery technology and stored in the battery
Data Source
AI summary
The present application provides a method and an apparatus for controlling energy recovery, a controller, and an electric vehicle. The method includes: determining whether an electric vehicle is in a coasting energy recovery mode or a braking energy recovery mode; acquiring an energy recovery torque of the electric vehicle if the electric is in the coasting energy recovery mode or the braking energy recovery mode; and sending the energy recovery torque to a motor controller of the electric vehicle, whereby allowing the motor controller to control a motor of the electric vehicle to charge a battery of the electric vehicle. The method provided by embodiments of the present application can solve the problem that the method for controlling energy recovery in the prior art is difficult to reach a maximum energy recovery.