Electric-Brake Controller Anti-Lock Undershoot Control
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Solution Overview
Problem
Existing electric-brake controllers experience undershoot in anti-lock control, leading to a shortage of braking force due to prolonged reverse-rotation current supply times and inefficient recovery of slipping states.
Innovation Solution
The electric-brake controller supplies reverse-rotation current for a predetermined time followed by forward-rotation current to quickly reduce pressing force and prevent undershoot, utilizing a predetermined reverse-rotation-current supply time and forward-rotation-current supply time to manage the electric motor's direction effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If reverse-rotation current is supplied continuously to quickly reduce pressing force, then recovery of slipping state is accelerated, but undershoot in pressing force occurs causing shortage of braking force
Solution Approach 1:
The patent applies periodic action by alternating between reverse-rotation current supply and forward-rotation current supply in a predetermined cycle. The reverse-rotation current reduces pressing force quickly to recover slipping state, while the forward-rotation current prevents undershoot by restoring pressing force. This periodic alternation resolves the contradiction between fast recovery and braking force consistency.
Solution Approach 2:
The patent applies preliminary action by supplying forward-rotation current after reverse-rotation current in a predetermined sequence. The forward-rotation current is prepared in advance to counteract the potential undershoot effect, ensuring that pressing force does not drop too low after the reverse rotation phase, thus maintaining reliable braking force.
2Reliability
If reverse-rotation current supply time is extended to ensure complete slipping recovery, then slipping state recovery is improved, but undershoot in pressing force increases
Solution Approach 1:
The patent uses periodic action with a predetermined cycle that includes both reverse-rotation current supply time and forward-rotation current supply time. By carefully controlling the duration and alternation of these phases, the system achieves complete slipping recovery during the reverse phase while the subsequent forward phase prevents undershoot, resolving the contradiction between reliable slipping recovery and harmful undershoot.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the supply time and alternation timing of reverse-rotation and forward-rotation currents based on the slipping state. This parameter optimization ensures that reverse-rotation current supply is sufficient for complete slipping recovery while the forward-rotation current timing is precisely controlled to prevent undershoot in pressing force.
3Productivity
If reverse-rotation current is supplied to reduce pressing force rapidly, then anti-lock control response is improved, but control precision deteriorates due to undershoot
Solution Approach 1:
The patent applies periodic action by alternating reverse-rotation and forward-rotation current supply in a predetermined cycle. The reverse-rotation phase provides rapid pressing force reduction for fast anti-lock control response, while the forward-rotation phase restores pressing force to maintain control precision and prevent undershoot, thus resolving the contradiction between response speed and control accuracy.
Solution Approach 2:
The patent uses feedback control to monitor the slipping state and adjust the alternation timing between reverse-rotation and forward-rotation current supply. This feedback mechanism ensures that the rapid pressing force reduction during reverse rotation does not cause excessive undershoot, maintaining both fast response and high control precision in anti-lock control.
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 reduces undershoot in pressing force, enhances braking force consistency, and improves control accuracy by quickly recovering slipping states during anti-lock control.
Implementation Method 1
an electric brake activated by an electric motor... rotation of the electric motor in a forward direction advances the pressing member
Implementation Method 2
a return spring configured to apply a spring force to the pressing member so as to move the pressing member backward
Implementation Method 3
a pair of friction pads are pressed against a rotor, resulting in reduced rotation of a wheel
Data Source
AI summary
An electric-brake controller includes an antilock controller configured to control a pressing force of an electric brake. The electric brake includes a pressing member that is advanced by rotation of an electric motor in a forward direction to press a friction member against a brake rotation member. The electric brake includes a return spring that applies a spring force such that the pressing member is moved away from the brake rotation member. The antilock controller includes a pressing-force reducer that reduces the pressing force. The pressing-force reducer includes: a reverse-rotation-current supplier that supplies reverse-rotation current for rotating the electric motor in a reverse direction for a reverse-rotation-current supply time; and a forward-rotation-current supplier that supplies forward-rotation current, for rotating the electric motor in the forward direction, to the electric motor after the reverse-rotation current is supplied for the reverse-rotation-current supply time.