Brake Actuator Control for Voltage Stability
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Solution Overview
Problem
Existing brake systems face challenges in maintaining a balance between electric energy generation and consumption, leading to voltage drops in power source devices, particularly when regenerative energy is low, as they do not effectively control the total consumed electric energy in relation to the regenerative energy levels.
Innovation Solution
The proposed brake system includes an actuator control device that adjusts the operation of multiple actuators to minimize total electric energy consumption when regenerative energy is low, ensuring that the required braking force is maintained while stabilizing the power source voltage by controlling the electric energy distribution between hydraulic and electric friction brakes based on regenerative energy levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric friction brake device is activated by electric energy from the power source device, then the braking force can be controlled, but voltage drop occurs in the power source device when regenerative energy is low
Solution Approach 1:
The control device dynamically adjusts the total consumed electric energy based on real-time regenerative energy levels. When regenerative energy is low, the system reduces overall energy consumption to prevent voltage drop; when regenerative energy is high, the system can maintain higher energy consumption for required braking force, thus adapting the power usage to current energy availability conditions
Solution Approach 2:
The system changes the parameter of total consumed electric energy based on regenerative energy levels. By monitoring regenerative energy and adjusting the sum of electric energies consumed by multiple actuators, the control device optimizes power usage to maintain voltage stability while achieving required braking performance
2Force
If multiple actuators are activated simultaneously, then the required braking force can be achieved, but the total consumed electric energy increases causing voltage drop
Solution Approach 1:
The control device applies partial action by selectively activating only the necessary actuators based on current braking requirements and regenerative energy levels. Instead of activating all actuators simultaneously, the system determines the minimum required energy consumption to achieve the target braking force, thus avoiding excessive energy usage and voltage drop
Solution Approach 2:
The control device uses feedback from regenerative energy monitoring to adjust actuator activation decisions. By continuously monitoring the electric energy returned to the power source device and comparing it with the required braking force, the system optimizes actuator control to achieve required braking performance while minimizing total energy consumption
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 approach effectively reduces voltage drops in the power source device by optimizing energy consumption and distribution, ensuring stable operation and improved energy efficiency in brake systems.
Implementation Method 1
electric energy acquired in an electric motor (referred to as a regenerative motor) that is connected to each wheel is directly supplied to a brake motor
Implementation Method 2
an electric friction brake device configured to restrict wheel rotation by causing a frictional engagement member to be pressed against a brake rotary body by drive force of an electric motor
Implementation Method 3
a hydraulic friction brake device configured to restrict wheel rotation by causing a frictional engagement member to be pressed against a brake rotary body by hydraulic pressure of a brake cylinder
Implementation Method 4
causing a frictional engagement member to be pressed against a brake rotary body
Data Source
AI summary
A brake system includes: (a) a first brake device including a first actuator and a first brake that utilizes an output of the first actuator; (b) a second brake device including a second actuator and a second brake that utilizes an output of the second actuator; (c) a regenerative-electric-energy obtaining device configured to obtain a regenerative electric energy that is returned to a power source device; and (d) an actuator control device configured to reduce a total consumed electric energy, by controlling the first actuator and/or the second actuator in a manner that maintains a state in which a required braking force is satisfied by a braking force of the first brake and/or a braking force of the second brake, such that the total consumed electric energy is made smaller when a regenerative electric energy is small, than when the regenerative electric energy is large.