Brake Control Device Regenerative Hydraulic Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake control systems for vehicles fail to efficiently manage the combination of regenerative and hydraulic braking, leading to excessive power consumption by the cooling fan and deterioration of electric mileage, especially during prolonged deceleration requests, as they do not account for changes in brake rotor temperature.
Innovation Solution
A brake control device that includes a motor, hydraulic brake, and a controller that coordinates regenerative and hydraulic braking, reducing friction braking force when the brake rotor temperature exceeds a threshold, and using regenerative braking while consuming power from an electric device to prevent overheating, and anticipates deceleration needs based on battery state and future driving predictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative brake control is performed while battery input is restricted, then electric mileage deteriorates due to excessive cooling fan power consumption, but braking force can be maintained
Solution Approach 1:
The control device changes the operational parameters of the braking system by switching between regenerative and hydraulic brake control modes based on battery state of charge. When battery input is restricted, the system transitions from pure regenerative braking to hybrid braking with hydraulic assistance, optimizing the balance between energy recovery and cooling requirements
Solution Approach 2:
The system dynamically adjusts the braking force distribution between regenerative and hydraulic brakes based on real-time battery status and thermal conditions. The control device continuously monitors battery charge state and modifies the braking control strategy accordingly, enabling adaptive optimization of energy consumption and cooling load
2Temperature
If friction braking force is reduced to prevent brake rotor overheating, then regenerative brake control opportunities increase, but braking force may be insufficient without proper coordination
Solution Approach 1:
The control device merges regenerative brake control with hydraulic brake control into a coordinated hybrid braking system. When brake rotor temperature approaches critical levels, the system combines the regenerative braking force with hydraulic friction braking to maintain sufficient total braking force while allowing the regenerative brake to operate for longer periods, thereby reducing overall thermal load
3Force
If hydraulic brake is used frequently to maintain braking force, then braking performance is ensured, but hydraulic brake endurance deteriorates
Solution Approach 1:
The control device converts the potential harm of frequent hydraulic brake usage into a benefit by strategically limiting hydraulic brake activation to only when absolutely necessary. By prioritizing regenerative brake control and using hydraulic brakes as a supplementary measure during battery charge restrictions, the system extends hydraulic brake life while maintaining adequate braking force through coordinated 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
This solution effectively suppresses the rise in brake rotor temperature, increases opportunities for regenerative braking, reduces the frequency of hydraulic brake use, and improves the endurance of the hydraulic brake by ensuring sufficient braking force through coordinated regenerative and hydraulic braking.
Implementation Method 1
a regenerative power generation is performed by the motor on a basis of rotation of the wheels to apply a regenerative braking force to the wheels
Implementation Method 2
a hydraulic brake that generates a friction braking force based on frictional contact with a brake rotor that integrally rotates with the wheels
Data Source
AI summary
A brake control device for a vehicle includes: a motor connected to wheels; a hydraulic brake that generates a friction braking force based on frictional contact with a brake rotor that integrally rotates with the wheels; a controller that performs coordination control of regenerative brake control, in which a regenerative power generation is performed by the motor on a basis of rotation of the wheels to apply a regenerative braking force to the wheels, and hydraulic brake control, in which the hydraulic brake is operated; and a battery that exchanges power with the motor. Further, in a case where a temperature of the brake rotor is higher than a predetermined temperature when input to the battery is restricted in a state where there is a deceleration request, the controller reduces the friction braking force, and performs the regenerative brake control while power is consumed by an electric device.