Brake Control Device Dynamic Pre-Charging Mode Selection
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Solution Overview
Problem
Conventional brake control devices lack responsiveness and comfortability, particularly in pre-charging mechanisms, as they rely on fixed pre-charging methods that do not adapt to vehicle state or operator intention.
Innovation Solution
A brake control device that includes a hydraulic pressure control system with a detecting portion to assess vehicle state and select between responsiveness priority and serenity priority modes, generating preparatory hydraulic pressure based on the selected mode, and utilizing sensors to determine the stroke and vehicle speed to optimize pre-charging fluid flow rates and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed pre-charging method is used to generate preparatory hydraulic pressure, then the braking responsiveness is improved, but operating noise increases and occupant comfortability deteriorates
Solution Approach 1:
The patent implements dynamic control of the pre-charging process by adjusting the flow rate of hydraulic fluid based on detected brake pedal operation speed. The system transitions from a fixed pre-charging method to a dynamic one where the flow rate control valve modulates fluid flow in real-time, matching the pre-charging speed to the driver's braking intent as detected by the operation speed sensor.
Solution Approach 2:
The system changes the flow rate parameter of hydraulic fluid during pre-charging based on the detected operation speed. When operation speed is low, the flow rate is restricted to minimize noise; when operation speed is high, the flow rate is increased to maintain responsiveness. This parameter adjustment resolves the contradiction between noise reduction and responsiveness maintenance.
2Speed
If a high flow rate is used during pre-charging to improve responsiveness, then braking responsiveness is improved, but operating noise increases
Solution Approach 1:
The flow rate control valve dynamically adjusts the hydraulic fluid flow rate parameter based on the detected brake pedal operation speed. The system establishes a relationship between operation speed and flow rate, allowing high flow rates only when high operation speeds are detected, and restricting flow rates when operation speeds are low, thereby eliminating unnecessary noise while preserving responsiveness when needed.
Solution Approach 2:
The system uses feedback from the operation speed sensor to continuously monitor and adjust the pre-charging flow rate. The detected operation speed feeds back to the flow rate control valve, which modulates the hydraulic fluid flow accordingly, creating a closed-loop control system that optimizes the balance between responsiveness and noise reduction.
3Speed
If pre-charging is performed uniformly for all braking operations, then braking responsiveness is improved, but energy consumption increases and fluid usage is wasted
Solution Approach 1:
The system applies partial pre-charging action only when necessary, based on the detected brake pedal operation speed. Instead of uniformly pre-charging for all braking operations, the system performs restricted pre-charging only when the operation speed threshold is met, avoiding unnecessary energy consumption and fluid usage during low-speed or non-critical braking situations.
Solution Approach 2:
The flow rate parameter is dynamically changed based on operation speed, allowing the system to optimize energy consumption by adjusting the pre-charging intensity to match the actual braking requirement. This parameter adjustment prevents excessive energy use and fluid consumption while maintaining necessary responsiveness.
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
The solution enhances braking responsiveness while minimizing operating noise, improving occupant comfort by dynamically adjusting pre-charging based on vehicle state and operator intent, preventing dragging phenomena, and reducing unnecessary fluid usage.
Implementation Method 1
a master cylinder which outputs a master pressure to the wheel cylinder by driving a master piston by a servo pressure inputted to a servo chamber and a hydraulic pressure generating device which outputs a desired hydraulic pressure to the servo chamber
Data Source
AI summary
The brake control device comprises a control mode selecting portion 64 which selects one control mode based on a detection result of the detecting portion from a control mode group including at least two control modes which are a responsiveness priority mode which gives more priority to a responsiveness of the braking force relative to an operation of a brake operating member than to a suppression of an operating noise occurred upon the generation of the preparatory hydraulic pressure and a serenity priority mode which gives more priority to the suppression of the operating noise than to the responsiveness of the braking force. The hydraulic pressure control portion controls the hydraulic pressure generating device to generate the preparatory hydraulic pressure in response to the control mode selected by the control mode selecting portion.