Brake Fluid Pressure Controller Motor Speed Control
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Solution Overview
Problem
Existing brake fluid pressure controllers for vehicles fail to adequately reduce operation noise of motors, pumps, and cut valves during brake fluid pressure control, especially during vehicle behavior stabilization, while maintaining pressure-intensifying performance.
Innovation Solution
A brake fluid pressure controller that adjusts the motor's revolution based on the difference between target and actual fluid pressures, driving the motor at a lower duty ratio when the difference is less than a predetermined value and at a higher duty ratio when the difference is greater, and also considers the vehicle's turning state to optimize pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor is driven at high revolutions to maintain pressure-intensifying performance, then the pressure control performance is improved, but the operation noise of the motor and pump increases
Solution Approach 1:
The patent applies dynamics by making the motor revolution number variable rather than fixed. The motor drive control part dynamically adjusts the revolution number based on the fluid pressure deviation - using high revolutions when deviation is large (requiring rapid pressure increase) and low revolutions when deviation is small (maintaining pressure). This dynamic adjustment resolves the contradiction between maintaining pressure performance and reducing noise.
Solution Approach 2:
The patent changes the operational parameter of motor revolution number based on system state. By monitoring the fluid pressure deviation and adjusting the motor speed accordingly, the system optimizes the balance between pressure control performance and noise generation. This parameter change approach allows the system to adapt to different operational conditions.
2Object-generated harmful factors
If the motor is driven at low revolutions to reduce operation noise, then the noise is reduced, but the pressure-intensifying performance deteriorates
Solution Approach 1:
The system dynamically adjusts motor speed based on real-time pressure deviation. When pressure deviation is small and noise reduction is prioritized, the motor runs at low revolutions. When pressure deviation exceeds the threshold and performance is critical, the motor automatically increases to high revolutions. This dynamic response ensures performance is maintained only when necessary.
Solution Approach 2:
The motor revolution number parameter is changed based on the fluid pressure deviation threshold. The system transitions between low and high revolution states depending on whether the pressure deviation is within acceptable limits, optimizing the trade-off between noise and performance.
3Speed
If the motor is frequently driven at high revolutions to respond to pressure deviations, then the pressure control responsiveness is improved, but the operation noise increases frequently
Solution Approach 1:
The patent implements feedback control by continuously monitoring the fluid pressure deviation and using this information to adjust motor speed. The feedback mechanism compares actual pressure with target pressure and triggers high-speed motor operation only when the deviation exceeds the predetermined threshold, ensuring responsive control while minimizing unnecessary noise-generating operations.
Solution Approach 2:
The system uses periodic monitoring of pressure deviation with a threshold-based trigger mechanism. Rather than continuous high-speed operation, the motor operates at high speed periodically only when needed (when deviation > threshold), creating a rhythm of high/low speed operation that balances responsiveness with noise reduction.
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 effectively suppresses operation noise and pulsation while maintaining pressure-intensifying performance, reducing the motor's operation noise and pulsation at the cut valve, and improving the stability of vehicle behavior control.
Implementation Method 1
a pump which is provided on each fluid pressure passage and capable of intensifying the brake fluid pressure
Implementation Method 2
a revolution-controllable motor configured to drive the pump
Data Source
AI summary
A brake fluid pressure controller for a vehicle includes: wheel brakes; a master cylinder for supplying pressure to a brake fluid; at least one fluid pressure passage connecting the wheel brakes with the master cylinder; a pump provided on each fluid pressure passage for intensifying the brake fluid pressure; a revolution-controllable motor for driving the pump; a motor drive control part for controlling motor revolutions; a target fluid pressure calculation part for setting a target fluid pressure of the brake fluid; a brake fluid pressure acquisition part; and a fluid pressure deviation calculation part for calculating a difference between the target fluid pressure and the brake fluid pressure. When the difference is less than a predetermined value, the motor drive control part drives the motor at a smaller number of revolutions, as compared with a case where the difference is the predetermined value or more.