Electric Vehicle Brake Control System for Cruise Braking
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Solution Overview
Problem
Electric vehicles with smart cruise control systems experience a loss of braking force due to the separate operation of regenerative braking and hydraulic pressure braking, leading to reduced braking effectiveness compared to engine vehicles.
Innovation Solution
A system and method that detect driver brake demands using a driving information detector and a vehicle controller, which stops and adjusts the braking control of the smart cruise controller to maintain or modify the braking amount based on the driver's input, ensuring the total braking amount is met by combining the demand braking amount with the regenerative braking amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking and hydraulic pressure braking are separately performed in electric vehicles, then fuel efficiency is improved, but braking force is lost
Solution Approach 1:
The patent merges regenerative braking and hydraulic pressure braking into a unified braking control system. The controller integrates both braking mechanisms to work simultaneously or sequentially, ensuring that the total braking force meets driver demands while maintaining fuel efficiency through optimized regenerative braking utilization.
Solution Approach 2:
The system dynamically adjusts the distribution between regenerative braking and hydraulic pressure braking based on real-time conditions such as driver input, vehicle speed, and battery state. The controller modulates the braking force from each source to optimize both fuel efficiency and braking performance across different operating scenarios.
2Extent of automation
If smart cruise control system performs braking control, then vehicular distance maintenance is improved, but braking effectiveness is reduced when driver brakes
Solution Approach 1:
The system incorporates feedback mechanisms where the controller continuously monitors driver braking input and smart cruise control braking actions. When driver braking is detected, the controller provides feedback to adjust and coordinate the smart cruise control braking, ensuring that the combined braking response is effective and meets driver expectations.
Solution Approach 2:
The controller performs preliminary assessment of driver braking intent by detecting brake pedal input before the smart cruise control system can initiate its braking sequence. This preliminary detection allows the system to pre-coordinate the braking forces, preventing conflicts and ensuring optimal braking effectiveness from the outset.
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
Prevents loss of braking force, enhances braking sense, and secures braking stability by separating the timing of stopping and releasing braking control, thereby improving overall braking performance.
Implementation Method 1
The motor of the electric vehicle operates as a generator during braking, and converts kinetic energy to electrical energy. The converted electrical energy is charged in a battery.
Data Source
AI summary
A method for controlling a brake of an electric vehicle provided with a smart cruise control system may include detecting, by a driving information detector, a brake demand of a driver when braking control due to a smart cruise controller is performed, stopping, by a vehicle controller, the braking control due to the smart cruise controller and maintaining a braking amount caused by the smart cruise controller when the brake demand of the driver is detected, determining, by the vehicle controller, a demand braking amount according to the brake demand of the driver, and performing, by the vehicle controller, braking control by using the maintained braking amount caused by the smart cruise controller and the demand braking amount.