Electric Brake Control Switching for Wiring Simplification
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Solution Overview
Problem
Existing electric brake systems face challenges with long wiring distances, high costs, weight, and communication instability due to thick three-phase power lines and complex communication systems, particularly in high-speed brake control applications like anti-lock braking.
Innovation Solution
The electric brake system incorporates a brake integrated control section that generates target braking force and wheel speed values, which are transmitted to electric brake control devices, allowing these devices to switch between braking force and wheel speed control based on predetermined conditions, simplifying wiring and communication by processing wheel speed sensor outputs locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a distributed electric brake control device is adopted for each brake, then the wiring structure is simplified and cost is reduced, but the communication stability deteriorates due to high network occupancy in high-speed brake control
Solution Approach 1:
The brake control system is segmented into a central brake integrated control section and distributed electric brake control devices. The wheel speed sensor outputs are processed locally by the brake integrated control section, and only integrated results are transmitted to individual actuators, reducing communication load and improving stability while maintaining wiring simplification benefits
Solution Approach 2:
The brake integrated control section acts as an intermediary between wheel speed sensors and electric brake actuators. It integrates wheel speed sensor outputs and transmits processed information to actuators, reducing the communication burden on the CAN bus and improving communication stability during high-speed brake control operations
2Power
If thick three-phase power lines are used to satisfy rated current, then the power transmission capability is improved, but the cost and weight of the harness increase
Solution Approach 1:
The power transmission system is segmented into a thick power line at the brake integrated control section (near the battery) and thinner power lines at distributed electric brake control devices. This segmentation allows the heavy-gauge wiring to be localized only where high current is required, reducing overall harness weight while maintaining adequate power transmission capability
3Length of stationary object
If the three-phase power line length is increased, then the distribution range is improved, but the power loss increases making high-speed brake control difficult to achieve
Solution Approach 1:
The power distribution system is segmented into a central high-power section and distributed low-power sections. The brake integrated control section receives high current through thick short power lines from the battery, while distributed electric brake control devices receive lower current through thinner longer power lines, minimizing overall power loss while extending distribution range
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 need for extensive wiring and costly communication systems, enhancing reliability and reducing costs by allowing longer communication periods and efficient anti-lock control without requiring high-speed communication networks.
Implementation Method 1
an electric motor 11 that drives the friction member operator 13
Data Source
AI summary
A brake integrated control section generates, as target values, a target braking force and a target wheel speed equivalent value of each electric brake device, and transmits the target braking force and the target wheel speed equivalent value to a target value transmitter. An electric brake control device of each electric brake device includes a braking force controller that controls an electric motor in accordance with the target braking force, a wheel speed controller that controls the electric motor in accordance with the target wheel speed equivalent value, and a control switcher. The control switcher switches between use of the braking force controller and use of the wheel speed controller in accordance with a predetermined condition.