Braking Feedback Control for Hybrid Vehicle Energy Recycling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current braking feedback control strategies for vehicles, particularly electric automobiles, face inefficiencies in energy recycling and complex control processes, leading to poor braking experience and low fuel economy, especially in hybrid vehicles with parallel/series two-wheel drive systems.
Innovation Solution
A braking feedback control method that distributes energy between an engine unit and motor generators during braking, using a system with an engine unit, transmission unit, motor generators, and a power switching device to optimize braking torque distribution, enhancing fuel efficiency, comfort, and safety, while allowing for torque compensation and multiple operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a parallel control strategy is used where original frictional braking force is not adjusted and feedback braking force is added, then braking experience is improved, but recycling rate of braking energy is low
Solution Approach 1:
The patent dynamically adjusts the frictional braking force based on real-time operating conditions (vehicle speed, acceleration, battery state) rather than maintaining a fixed frictional braking force. The control method calculates optimal frictional braking force dynamically to balance braking experience and energy recycling efficiency
Solution Approach 2:
The patent changes the parameter of frictional braking force from a static value to a dynamically adjusted value based on multiple factors including vehicle speed, acceleration, and battery charge state. This allows optimization of both braking experience and energy recycling rate under different operating conditions
2Loss of energy
If a series control strategy is used where frictional force is adjusted to increase recycling rate, then recycling rate of braking energy is large and braking experience is desirable, but control process becomes relatively complex
Solution Approach 1:
The patent segments the braking control into distinct phases (initial braking phase and subsequent braking phase) with different control strategies for each phase. This simplifies the overall control process by breaking down the complex continuous control into manageable discrete stages
Solution Approach 2:
The patent applies frictional braking adjustment only during specific phases of the braking process (initial phase with large deceleration, and subsequent phase with small deceleration) rather than continuously adjusting throughout the entire braking process, thereby reducing control complexity while maintaining effectiveness
3Device complexity
If braking energy recycling is controlled only according to torque value fed back by motor generator, then system structure is simplified, but fuel economic efficiency and discharge performance are not optimized
Solution Approach 1:
The patent makes the motor generator system multi-functional by using it not only for torque feedback control but also for direct frictional braking force adjustment during specific braking phases. This eliminates the need for separate frictional braking control systems while optimizing fuel economy and emission performance
4Loss of energy
If frictional braking force is adjusted to achieve better energy recycling, then recycling rate increases, but control process becomes relatively complex due to difficulty in adjusting frictional braking force
Solution Approach 1:
The patent implements dynamic adjustment of frictional braking force based on real-time vehicle operating conditions including speed, acceleration, and battery state. This dynamic control approach achieves high energy recycling rates while maintaining operational simplicity through automated real-time optimization
Solution Approach 2:
The patent employs feedback control mechanisms where the control system continuously monitors vehicle operating parameters (speed, acceleration, battery charge state) and adjusts frictional braking force accordingly. This closed-loop feedback approach simplifies the control process by using automated sensor-based adjustments rather than manual or open-loop control
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
The method improves braking feedback efficiency, achieving high fuel economy, low emissions, and stable driving performance by optimizing energy distribution and torque management, thereby maximizing mileage, comfort, and steering capability.
Implementation Method 1
a first motor generator coupled with the transmission unit... a second motor generator configured to drive at least one of front and rear wheels... controlling the vehicle to enter a braking feedback control mode... a braking torque of the first motor generator, a braking torque of the second motor generator
Data Source
AI summary
The present disclosure discloses a vehicle and a braking feedback control method for the same. The braking feedback control method includes the following steps: detecting a current speed of a vehicle and a depth of a braking pedal of the vehicle; when the current speed of the vehicle is greater than a preset speed, the depth of the braking pedal is greater than 0, and an anti-lock braking system of the vehicle is in a non-working state, controlling the vehicle to enter a braking feedback control mode, where when the vehicle is in the braking feedback control mode, a required braking torque corresponding to the vehicle is obtained according to the depth of the braking pedal, and a braking torque of a first motor generator, a braking torque of a second motor generator, and a braking torque of basic braking performed on the vehicle are distributed according to the required braking torque.