Actuator Control for Electromechanical Brake Power Reduction
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Solution Overview
Problem
Electromechanical brake systems face challenges in maintaining a steady brake force during driving, leading to issues like motor stall and high power consumption, and struggle to accurately process brake signals due to ambient disturbances, especially when transitioning between braking and non-braking states.
Innovation Solution
A controlling method for an actuator that locks the shaft based on a preset stationary condition, which includes filtering and smoothing the brake demand signals to reduce noise interference and ensure the brake force holding device is activated only when the brake demand is steady, thereby reducing power consumption and improving brake intention determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric motor continuously outputs brake force to maintain parking or downhill braking, then the brake force holding capability is improved, but power consumption increases and motor stall occurs
Solution Approach 1:
The system dynamically switches between two operating modes: active braking mode where the electric motor outputs brake force, and holding mode where the electromagnetic brake maintains brake force with minimal power consumption. This dynamic transition resolves the contradiction by adapting the system state to operational requirements.
Solution Approach 2:
The patent replaces continuous electric motor braking with an electromagnetic brake (solenoid-based mechanical locking system) for maintaining parking brake force. This substitution eliminates the need for continuous electrical power while maintaining braking capability, directly addressing the power consumption issue.
2Speed
If the brake force holding device is activated immediately upon brake demand, then the brake response speed is improved, but false activation due to ambient disturbance increases
Solution Approach 1:
The system performs preliminary filtering and smoothing operations on brake demand signals before activation decision. This preliminary processing prepares the signal by removing noise and stabilizing variations, enabling accurate distinction between intentional braking and ambient disturbances while maintaining rapid response to valid brake demands.
Solution Approach 2:
The system continuously monitors brake demand signals and compares them against filtered references, using feedback control to determine when activation conditions are truly met. This feedback mechanism prevents false activation by requiring sustained, consistent brake demand signals that exceed threshold criteria.
3Loss of time
If the brake demand signal is processed without filtering, then the response time is improved, but noise interference causes false activation
Solution Approach 1:
The system changes the temporal parameters of signal processing by applying filtering and smoothing operations that transform raw brake demand signals into stabilized reference signals. This parameter transformation maintains essential response characteristics while eliminating high-frequency noise that causes false activation.
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 method effectively reduces power consumption by ensuring the brake force holding device is activated only when the brake demand is steady, enhancing the accuracy of brake intention determination and adapting to various vehicle models and driving states by dynamically adjusting the stationary condition based on factors like vehicle load and speed.
Implementation Method 1
the brake force holding device includes an electromagnetic brake, and the electromagnetic brake includes a coil and an armature that is movable along an axial direction of a shaft of the electric motor
Data Source
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AI summary
This present disclosure provides a controlling method for an actuator, an actuator, and an electromechanical brake system of brake technology. The controlling method comprises: receiving brake demand; controlling the electric motor based on the brake demand; if the brake demand satisfies a preset stationary condition within a preset period, controlling the brake force holding device to lock the shaft. In this way, frequent variations of the brake demand caused by interference from ambient disturbance or the driver's unsteady brake instructions may be prevented so that the actuator can be locked timely, thereby maintaining a continuous brake torque output with low power consumption or zero power consumption to provide a continuous brake force to the vehicle.