Vehicle Brake Device Adaptive Target Pressure Control
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Solution Overview
Problem
In vehicle brake devices, feed-back control systems can lead to sudden changes in hydraulic pressure due to control delays, resulting in deteriorated brake feeling, noise, or shock, especially during soft or gentle brake operations at low speeds.
Innovation Solution
A vehicle brake device that adjusts the target pressure to align closer with the actual hydraulic pressure when a pressure deviation exceeds a certain threshold, allowing for a gradual change in braking force by shifting the instruction target pressure to the actual pressure side, thereby reducing the pressure difference and minimizing sudden changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If feed-back control is used to make actual hydraulic pressure approximate target pressure quickly, then response speed is improved, but sudden pressure change occurs causing deterioration of brake feeling and noise
Solution Approach 1:
The target pressure setting portion dynamically adjusts the target pressure based on the current actual hydraulic pressure and pressure deviation magnitude. When pressure deviation is large, the target pressure is set to a value between the operating target pressure and actual pressure, creating a dynamic, adaptive control system that prevents sudden pressure changes while maintaining responsiveness.
Solution Approach 2:
The invention changes the target pressure parameter adaptively based on the pressure deviation condition. By setting the target pressure to an intermediate value when deviation exceeds the threshold, the system modifies the control parameter to achieve gradual pressure change, resolving the contradiction between fast response and smooth pressure transition.
2Productivity
If target pressure is set to operating target pressure, then braking force response is improved, but pressure deviation causes sudden braking force change
Solution Approach 1:
The target pressure setting portion implements dynamic target pressure adjustment based on real-time pressure deviation conditions. When deviation is within threshold, operating target pressure is used for quick response; when deviation exceeds threshold, an intermediate target pressure is used for stability, creating a dynamic switching mechanism that balances response and stability.
Solution Approach 2:
The invention adaptively changes the target pressure parameter based on pressure deviation magnitude. By switching between operating target pressure and intermediate pressure values, the system optimizes the balance between braking force response speed and stability, preventing sudden changes while maintaining effectiveness.
Data Source
AI summary
A vehicle brake device includes a hydraulic pressure control portion which performs a feed-back control so that an actual hydraulic pressure of the brake fluid approximates an instruction target pressure and a target pressure setting portion which sets the instruction target pressure to a value closer to the actual hydraulic pressure side than an operating target pressure, when a pressure deviation between the operating target pressure which is a target value of the hydraulic pressure of the brake fluid corresponding to a brake operation and the actual hydraulic pressure is larger than a first pressure difference and at the same time when the actual hydraulic pressure is approaching to the operating target pressure.