Yaw-Rate Torque Distribution for Stable Vehicle Energy Recovery
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Solution Overview
Problem
Existing methods for distributing energy recovery torque in four-wheel drive new energy vehicles fail to ensure vehicle attitude stability due to fixed front-rear torque distribution ratios, compromising safety.
Innovation Solution
A method and device that dynamically adjust front and rear axle torques based on actual yaw rate, incorporating stability and economic distribution parameters to ensure vehicle stability and efficient energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed front-rear torque distribution ratio is used for energy recovery torque distribution, then the control method is simple, but the vehicle attitude stability cannot be ensured
Solution Approach 1:
The patent implements dynamic torque distribution by continuously adjusting the front-rear torque distribution ratio based on real-time yaw rate feedback. The control system transitions from a static fixed ratio to a dynamic adaptive ratio that changes with vehicle operating conditions, specifically using the relationship between actual and target yaw rates to modulate the distribution parameter and maintain vehicle stability during energy recovery braking.
Solution Approach 2:
The patent introduces a feedback control mechanism where the actual yaw rate is continuously measured and compared with the target yaw rate. The difference between these values feeds back to the torque distribution control system, which adjusts the front-rear torque distribution ratio accordingly. This closed-loop feedback ensures that the torque distribution adapts to maintain desired vehicle attitude stability while performing energy recovery.
2Use of energy by moving object
If energy recovery is performed during deceleration braking, then energy utilization efficiency is improved, but vehicle stability control becomes more complex
Solution Approach 1:
The patent makes the motor serve multiple functions: during deceleration braking, it simultaneously performs energy recovery (generating electricity) and stability control (adjusting torque distribution). The motor acts as both a power generation device and a controllable braking device, integrating energy recovery and stability control functions into a single system rather than requiring separate dedicated systems for each function.
Solution Approach 2:
The patent controls vehicle stability by dynamically changing the torque distribution parameters between front and rear axles. The control system adjusts the torque distribution ratio as a variable parameter based on yaw rate feedback, allowing flexible modulation of the braking force distribution to maintain vehicle stability while the motor performs energy recovery during deceleration braking.
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 vehicle stability and safety while optimizing energy recovery efficiency by adaptively distributing torques according to actual driving conditions.
Implementation Method 1
a motor is switched to a power generation mode during deceleration braking of the vehicle, and the motor converts energy into electric energy and stores the electric energy in a battery
Data Source
AI summary
A method and a device for distributing an energy recovery of a vehicle are disclosed. The method includes: acquiring an actual yaw rate of the vehicle in a driving process; and determining a first distribution parameter of front and rear axle torques according to the actual yaw rate. The first distribution parameter is a stability distribution parameter of the front and rear axle torques of the vehicle.