Planetary Brake Booster Coupling for Dual-Motor Redundancy
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Solution Overview
Problem
Existing brake assistance systems for electric vehicles require high power and torque from a single motor, and have complex space layout requirements, with limited redundancy for reliability, as they rely on a decoupled mechanism between actuator motors that can fail under stress.
Innovation Solution
A brake assistance system utilizing a planetary row coupling node with a booster motor, simulation motor, and brake master cylinder, where both motors drive the brake master cylinder simultaneously, reducing power requirements and ensuring continued braking functionality if one motor fails, through a planetary gear mechanism and transmission systems that allow for electro-hydraulic decoupling and closed-loop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor drives the brake master cylinder, then the system structure is simple, but the power and torque requirements for the motor are excessively high
Solution Approach 1:
The patent divides the single motor driving function into two separate motors (first motor and second motor) that work together through a differential mechanism. Each motor handles a portion of the braking torque requirement, reducing the power and torque burden on each individual motor while maintaining the overall braking capability.
Solution Approach 2:
The patent combines the output of two motors through a differential mechanism to drive the brake master cylinder. The differential mechanism merges the rotational outputs of both motors into a single linear motion output, allowing the system to achieve the required braking force with distributed motor loads.
2Reliability
If two actuator motors are connected in series with a gap, then the system provides redundancy and space for manual operation, but the system length increases and space layout requirements become more complex
Solution Approach 1:
The patent nests the first motor and second motor within a compact differential mechanism structure. The motors are arranged concentrically or in close proximity, with their outputs combined through the differential mechanism, significantly reducing the overall system length compared to a series arrangement with gaps.
Solution Approach 2:
The differential mechanism acts as an intermediary that directly couples the outputs of the two motors to the brake master cylinder. This eliminates the need for gaps or intermediate mechanical linkages, providing a compact integrated structure while maintaining the redundancy benefits of having two motors.
3Device complexity
If one motor always drives the brake master cylinder, then the control is simple, but the other motor cannot contribute to braking and the single motor must handle all power requirements
Solution Approach 1:
The patent makes both motors functional contributors to the braking process through the differential mechanism. Each motor can independently or simultaneously drive the brake master cylinder, allowing either motor to handle braking tasks and both to share the load, thereby reducing the power requirement for each motor.
Solution Approach 2:
The control system monitors the braking requirements and dynamically adjusts the torque distribution between the two motors. The controller receives feedback on braking force requirements and coordinates the motors accordingly, optimizing power distribution while maintaining simple overall control architecture.
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 configuration reduces the power demand on individual motors, enhances braking reliability by enabling continued operation if one motor fails, and allows for adjustable braking forces through electro-hydraulic decoupling, improving the overall braking performance and safety of electric vehicles.
Implementation Method 1
a planetary gear mechanism, a first transmission mechanism, a second transmission mechanism, and a third transmission mechanism. The brake pedal drives, by using the first transmission mechanism, a ring gear of the planetary gear mechanism to rotate. The booster motor drives, by using the second transmission mechanism, a planet carrier of the planetary gear mechanism to rotate. The simulation motor is connected to a sun gear of the planetary gear mechanism and is configured to drive the sun gear to rotate. The planet carrier drives, by using the third transmission mechanism, the piston rod to move linearly.
Implementation Method 2
The planetary row coupling node is configured to convert a torque of the brake pedal, a torque output by the booster motor, and a torque output by the simulation motor into an acting force acting on a piston rod in the brake master cylinder.
Data Source
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AI summary
This application provides a brake assistance system, a brake method, and an electric vehicle. The brake assistance system includes a brake pedal, a booster motor, a simulation motor, a planetary row coupling node, and a brake master cylinder. The brake master cylinder is configured to provide a braking force for the vehicle. The brake pedal, the booster motor, and the simulation motor are separately connected to the planetary row coupling node. The planetary row coupling node is configured to convert a torque of the brake pedal, a torque output by the booster motor, and a torque output by the simulation motor into an acting force acting on a piston rod in the brake master cylinder. It can be learned from the foregoing description that, the planetary row coupling node is disposed, so that both the torque output by the simulation motor and the torque output by the booster motor are used as the force for driving the piston rod of the brake master cylinder. This can reduce an output power requirement on a single motor. In addition, when two motors are used to drive the brake master cylinder at the same time, if one motor fails, the other motor can be used for braking, so that reliability of the entire brake assistance system is improved.