Active Safety Braking Control for Electric Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pure electric vehicles face challenges in braking safety due to limited torque and battery state of charge limitations, where regenerative braking is insufficient for emergency braking and cannot adjust lockup, necessitating additional mechanical or hydraulic braking.
Innovation Solution
An active safety control system that includes pedal detection, motor state, and wheel speed detection devices, along with a control device to determine and control braking modes, ensuring anti-lock braking by adjusting torques across four wheels based on driver intention, combining regenerative, hybrid, and hydraulic braking modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is used in electric vehicles, then energy recovery is improved, but braking torque is insufficient for emergency braking and lock adjustment capability is lost
Solution Approach 1:
The patent combines regenerative braking system with hydraulic braking system into a unified braking system. The regenerative braking provides energy recovery during normal braking, while the hydraulic braking system supplements when additional braking torque is needed for emergency stopping or wheel lock adjustment, thus resolving the contradiction between energy recovery and sufficient braking torque.
Solution Approach 2:
The braking system is designed to perform multiple functions: energy recovery through regenerative braking, emergency stopping through hydraulic braking, and wheel lock prevention through coordinated control of both systems. This multi-functionality allows the system to overcome the limitations of regenerative braking alone while maintaining its energy recovery capability.
2Loss of energy
If regenerative braking is used, then energy recovery is improved, but lock adjustment capability is lost
Solution Approach 1:
The patent merges regenerative braking with hydraulic braking systems, where the hydraulic component provides the necessary lock adjustment capability that regenerative braking alone cannot achieve, while preserving energy recovery functionality.
Solution Approach 2:
The hydraulic braking system acts as an intermediary that supplements the regenerative braking system when lock adjustment is needed. The control device mediates between the two systems, activating hydraulic braking specifically for lock prevention while allowing regenerative braking to handle energy recovery during normal operation.
3Power
If hydraulic braking is added to supplement regenerative braking, then braking torque is improved, but system complexity increases
Solution Approach 1:
The hydraulic braking system is designed to serve multiple purposes: providing additional braking torque when needed, enabling wheel lock adjustment, and working in coordination with regenerative braking. This multi-functionality justifies the added complexity by consolidating multiple requirements into a single integrated system.
Solution Approach 2:
The control device continuously monitors wheel speed, braking force requirements, and system state to dynamically coordinate between regenerative and hydraulic braking systems. This feedback control optimizes the interaction between the two subsystems, managing complexity through intelligent control rather than mechanical complexity.
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 system effectively prevents wheel locking by dynamically adjusting braking torques, ensuring the vehicle decelerates or stops according to driver intent, enhancing safety and stability by integrating regenerative and hydraulic braking systems.
Implementation Method 1
the regenerative braking only plays a role in energy recovery during slow braking due to limited torque and limitation of the battery state of charge (SOC)
Implementation Method 2
hydraulic or mechanical braking is also needed during emergency braking
Implementation Method 3
combining mechanical braking with regenerative braking or combining hydraulic braking with regenerative braking
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention discloses an active safety control system and method for a vehicle. The system comprises: a plurality of motors arranged on a plurality of wheels; a plurality of brakes arranged on the plurality of wheels; a hydraulic braking device; a pedal detection device, used for detecting pedal signals of the vehicle; a motor state detection device, used for detecting the states of the plurality of motors; a plurality of wheel speed detection devices, arranged on the plurality of wheels, used for detecting speeds of the wheels and generating wheel speed detection signals; a power battery, connected with the plurality of motors respectively; and a control device, used for obtaining braking torques according to the pedal signals and the wheel speed detection signals, determining a corresponding braking mode according to the states of the plurality of motors, and controlling the plurality of brakes, the plurality of motors and the hydraulic braking device according to the braking mode and the braking torques. The system can ensure safety, realize regenerative braking feedback and improve the braking control precision.