Electric Brake System Braking Force Redistribution
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Solution Overview
Problem
Electric brake systems face functional degradation due to mechanical component abnormalities or power supply issues, leading to inadequate braking force generation.
Innovation Solution
An electric brake system that includes a controlled variable error estimation module to distribute braking force among normal electric brake devices, compensating for the loss by estimating and adding the distributed braking force to the braking force target values, and a power supply switching mechanism to switch to a backup power source in case of main power failure, ensuring redundancy and efficient power use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional degradation occurs in an electric brake device, then the braking force generation capability deteriorates, but the system can compensate by distributing braking force to other normal electric brake devices
Solution Approach 1:
The control calculation module continuously monitors the operational status of each electric brake device and dynamically adjusts braking force distribution based on real-time feedback. When functional degradation is detected in one device, the system receives feedback signals and automatically redistributes the required braking force to other normal devices, ensuring maintained braking performance without manual intervention.
Solution Approach 2:
The system dynamically adapts its braking force distribution strategy based on the real-time operational conditions of each electric brake device. The braking force target values are not fixed but are continuously adjusted according to the actual performance status of individual devices, allowing the system to optimize braking force allocation and compensate for degradation dynamically.
2Reliability
If a backup power supply device is added to ensure redundancy, then the system reliability improves, but the device complexity and power management complexity increase
Solution Approach 1:
The backup power supply device is pre-configured and integrated into the system architecture before any power failure occurs. The control calculation module is programmed with predetermined logic to automatically detect power supply abnormalities and switch to the backup power source without requiring complex real-time decision-making or manual intervention, thereby maintaining reliability while managing complexity through advance preparation.
3Reliability
If braking force is redistributed among normal electric brake devices, then the desired braking force is maintained, but the control precision requirements increase
Solution Approach 1:
The system changes the control parameters by adjusting the braking force target values for each individual electric brake device based on its operational status. When one device degrades, the control calculation module recalculates and redistributes the braking force parameters among the remaining normal devices, ensuring that the sum of distributed braking forces equals the desired total braking force while accounting for the specific capabilities of each device.
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 system effectively compensates for braking force deficiencies caused by functional degradation, maintaining desired braking performance and improving vehicle stability and power efficiency.
Implementation Method 1
an electric motor 4, a speed reduction mechanism 5, and a linear motion mechanism 6
Implementation Method 2
a brake rotor 8, and a friction member 9
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Provided is an electric brake system capable of compensating for a braking force by the whole electric brake system when functional degradation occurs in a part of the system. This system includes: a diagnosis module (24) that detects functional degradation in each of electric brake devices (DB); a control calculation module (23) that estimates a controlled variable error that is a difference between an estimate of a braking force determined by a braking force estimation device (28) of an electric brake device (DB) in which functional degradation is detected, and a braking force determined by the device (28) of an electric brake device (DB) in which no functional degradation is detected; and a controlled variable compensating module (29) that, when the module (23) estimates the existence of the error, distributes a braking force corresponding to the error among the devices (DB) other than the electric brake device in which the error exists so as to add the distributed braking force to the braking force target value of each electric brake device.