Electric Braking Control Apparatus Voltage Drop Mitigation
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Solution Overview
Problem
The reliability of electric braking force control in vehicles is compromised when battery or power supply line voltage drops, leading to potential shutdown of the electric brake control unit and unstable braking performance.
Innovation Solution
The electric braking apparatus limits current flow through the power supply line to maintain voltage above a predetermined minimum for the electric brake control unit, ensuring stable operation even during voltage drops by using a microcomputer to control the inverter application voltage and implement current limiting strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If current is increased to maintain braking force, then braking performance is improved, but voltage drop increases causing control unit shutdown
Solution Approach 1:
The patent applies dynamics by making the current command value adjustable and time-dependent. The control unit dynamically modifies the current command value based on detected voltage drops, increasing it during voltage drops to maintain braking force while preventing control unit shutdown. This dynamic adjustment resolves the contradiction between maintaining braking force and preventing voltage-induced shutdown.
Solution Approach 2:
The patent changes the electrical parameters (current command value and voltage threshold) adaptively. By detecting voltage drops and responding with increased current command values, the system changes operational parameters to maintain braking force. The threshold voltage parameter is used to trigger these changes, resolving the contradiction between force maintenance and reliability.
2Reliability
If current is limited to prevent voltage drop, then control unit reliability is improved, but braking force decreases
Solution Approach 1:
Rather than static current limiting, the patent uses dynamic current adjustment. The current command value is increased during detected voltage drops and returned to normal when voltage stabilizes. This dynamic approach maintains control unit reliability by responding to actual voltage conditions while preserving braking force when possible.
Solution Approach 2:
The patent applies preliminary anti-action by detecting voltage drops before they cause control unit shutdown and preemptively increasing the current command value. This prevents the harmful effect (shutdown) while counteracting the potential loss of braking force through proactive current adjustment.
3Force
If current command value is increased during voltage drop, then braking force is maintained, but risk of component damage increases
Solution Approach 1:
The patent uses periodic monitoring of voltage conditions and periodic adjustment of the current command value. The control unit continuously detects voltage drops and applies current adjustments in periodic cycles, increasing current during drops and returning to normal operation when voltage recovers. This periodic action maintains braking force while managing component stress through controlled, temporary increases.
Solution Approach 2:
The current command value is made dynamic and time-dependent, adjusting based on real-time voltage conditions. This dynamic approach allows temporary increases during voltage drops to maintain braking force while automatically reducing current when voltage recovers, preventing sustained high stress on components.
Data Source
AI summary
An electric braking control apparatus for controlling an electric braking apparatus which includes a brake pad, a motor which generates a rotational torque, and a rotation/linear motion conversion mechanism which causes the brake pad to generate a pressing force based on the torque. The braking control apparatus includes an inverter which converts and outputs an electric current supplied from a power supply to the motor, and a microcomputer that receives power from the power supply, detects the value of a voltage applied from the power supply to the inverter, and controls the electric current output from the inverter depending on a result of the detection.