Electromechanical Wheel Brake Thermal Protection via Parking Brake Takeover
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Solution Overview
Problem
The rapid rise in temperature of the brake motor due to prolonged stalling during service braking in electromechanical brake systems of electric vehicles reduces the motor's service life and affects braking safety, and conventional heat dissipation improvements increase hardware costs.
Innovation Solution
A wheel brake apparatus with a service brake unit and a parking brake unit that includes a brake motor and a parking brake unit, which locks the brake motor when it exceeds a preset temperature or torque threshold, reducing the output torque and drive current to mitigate overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake motor operates in a stalled state for a long time during service braking, then the braking force is maintained, but the temperature of the brake motor rises rapidly reducing service life
Solution Approach 1:
The parking brake actuator serves as an intermediary mechanism that takes over the braking function when the brake motor temperature exceeds the threshold. The control unit activates the parking brake actuator to provide braking force while the brake motor is protected from overheating, thus mediating between the need for continuous braking and temperature management
Solution Approach 2:
The control unit monitors the temperature parameter of the brake motor and changes the operational state based on temperature thresholds. When temperature exceeds the threshold, the system switches from motor-driven braking to parking brake actuator braking, dynamically adjusting the braking mechanism based on thermal conditions
2Temperature
If conventional heat dissipation structures are changed to improve heat dissipation performance, then the temperature management is improved, but the hardware costs increase
Solution Approach 1:
The patent replaces mechanical/structural heat dissipation modifications with a control-based solution. Instead of changing the physical heat dissipation structure of the brake motor, the system uses a control unit to monitor temperature and switch between braking mechanisms, substituting structural modification with intelligent control
Solution Approach 2:
The brake system performs self-protection by monitoring its own temperature through the control unit and automatically switching to the parking brake actuator when overheating is detected. This self-regulating mechanism eliminates the need for complex external heat dissipation structures
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 solution effectively reduces heat load on the brake motor, increasing its operating life and improving safety and reliability without increasing hardware costs.
Implementation Method 1
The brake motor is configured to output a torque to drive the brake actuator to clamp a brake disc
Implementation Method 2
The parking brake unit is configured to lock a rotor of the brake motor
Data Source
AI summary
A wheel brake apparatus and an electromechanical brake system with a function of over-temperature protection for a brake motor, and an electric vehicle. The wheel brake apparatus includes a service brake unit, a parking brake unit, and a wheel controller. In a braking process of the electric vehicle, the wheel controller is configured to: in response to that a winding temperature of a brake motor is greater than or equal to a first temperature, control the brake motor to reduce an output torque, and control the parking brake unit to output a brake force for parking. The wheel brake apparatus and the electromechanical brake system can increase an operating life of the brake motor and improve operation reliability of the electric vehicle.