Electric Vehicle Brake Mode Coordination to Suppress Jitter
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Solution Overview
Problem
Existing braking systems in electric vehicles face issues with brake jitter and high hardware and software costs due to simultaneous use of multiple brake modes, which are not effectively addressed in hybrid vehicles equipped with Electronic Stabilization Systems.
Innovation Solution
A method for controlling a braking system in electric vehicles that utilizes up to two brake modes, determining their strengths and priorities, and coordinating them to suppress brake jitter, thereby simplifying control strategies and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple brake modes are simultaneously used, then brake energy recovery is improved, but brake jitter occurs and vehicle stability deteriorates
Solution Approach 1:
The patent changes the parameter of brake mode quantity from multiple to two, and adjusts the working parameters of these two brake modes dynamically based on vehicle conditions. This parameter optimization resolves the contradiction by finding the optimal balance point where energy recovery is maximized without causing brake jitter, thereby maintaining vehicle stability.
2Stability of the object's composition
If Electronic Stabilization System is added to coordinate brake modes, then vehicle stability is improved, but hardware and software costs increase significantly
Solution Approach 1:
The patent extracts and removes the expensive Electronic Stabilization System from the braking coordination architecture. Instead, it uses a simplified control strategy that coordinates only two brake modes through basic control units already present in electric vehicles, thereby achieving vehicle stability without the high hardware and software costs of ESP.
Solution Approach 2:
The patent makes the two coordinated brake modes serve multiple functions: they provide both deceleration and vehicle stability control. By optimizing the coordination of these two brake modes, the system achieves the stability function previously requiring dedicated ESP hardware, thereby reducing overall system complexity and cost.
3Adaptability or versatility
If continuous brake coordinator is developed for pure electric vehicles, then adaptability is improved, but development complexity and costs increase
Solution Approach 1:
The patent optimizes the parameter of brake mode quantity to two, which is the optimal value for pure electric vehicles. This parameter optimization simplifies the control strategy while maintaining adaptability to different driving conditions, as the system only needs to coordinate two brake modes rather than managing complex multi-mode coordination.
Data Source
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AI summary
The present invention relates to a method for controlling a braking system of an electric vehicle, comprising: determining a total requested brake strength (S1) of the braking system based at least on a brake request of the braking system and a vehicle driving speed of the electric vehicle; determining a brake strength of each brake mode of the braking system based at least on vehicle status information of the electric vehicle, the braking system having at least three brake modes, and the brake modes having a preset priority (S2; and if at most two brake modes are put into use, determining a requested brake force S3 of each brake mode based at least on the total requested brake strength and the priority of the brake mode. According to the present invention, it is possible to effectively suppress brake jitter in the brake process, improve the driving comfort of the vehicle, and simplify the control strategy for coordinating these brake modes, effectively reducing the hardware and software costs of a continuous brake coordinator for coordinating these brake modes.