Vehicle Brake Pressure Control for Stable Wheel Pressurization
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Solution Overview
Problem
Existing braking control devices for vehicles face challenges in preventing fluctuations in liquid pressure during pressurization by the lower braking unit.
Innovation Solution
The braking control device incorporates an upper braking unit that throttles the supply pressure using a pressure adjustment valve, and a lower braking unit that pressurizes the supply pressure to output a wheel pressure. The upper braking unit reduces the electric motor's rotation number when the lower braking unit pressurizes the wheel pressure, thereby stabilizing the liquid pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lower braking unit pressurizes the wheel pressure, then the braking force is increased, but a fluctuation in the liquid pressure occurs
Solution Approach 1:
The control device monitors the liquid pressure in the upper braking unit and dynamically adjusts the electric motor's rotation number based on feedback signals. When the lower braking unit pressurizes the wheel pressure, the system detects this condition and reduces the motor speed to prevent pressure fluctuations, maintaining stable liquid pressure while preserving braking force generation.
Solution Approach 2:
The system dynamically adjusts the operation parameters of the upper braking unit based on the operational state of the lower braking unit. The electric motor's rotation number is varied in real-time according to whether the lower unit is pressurizing, allowing the system to adapt its characteristics to prevent pressure fluctuations while maintaining effective braking performance.
2Stability of the object's composition
If the electric motor rotation number is reduced when the lower braking unit pressurizes, then the liquid pressure fluctuation is prevented, but the pressurization speed may be affected
Solution Approach 1:
The system implements dynamic speed adjustment where the electric motor's rotation number is adaptively controlled based on the lower braking unit's pressurization state. During lower unit pressurization, the motor speed is reduced to prevent fluctuations; when the lower unit is not pressurizing, the motor operates at higher speeds to maintain efficient pressurization, thus balancing stability and speed requirements.
Solution Approach 2:
The control device changes the operational parameters of the electric motor based on system conditions. By adjusting the rotation number parameter according to whether the lower braking unit is pressurizing, the system optimizes performance to prevent pressure fluctuations while minimizing impact on overall pressurization speed through conditional parameter modification.
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 configuration effectively prevents fluctuations in liquid pressure during pressurization by the lower braking unit, ensuring stable braking performance.
Implementation Method 1
a circulation flow (KN) discharged by a fluid pump (QA) driven by an electric motor (MA)
Implementation Method 2
pressurize a supply pressure (Pm) by throttling, with a pressure adjustment valve (UA), a circulation flow (KN)
Data Source
AI summary
A braking control device for a vehicle includes an upper braking unit configured to pressurize a supply pressure by throttling, with a pressure adjustment valve, a circulation flow discharged by a fluid pump driven by an electric motor, and a lower braking unit disposed between the upper braking unit and a wheel cylinder and configured to pressurize the supply pressure to output a wheel pressure to the wheel cylinder. In a case where the lower braking unit pressurizes the wheel pressure, the upper braking unit reduces a rotation number of the electric motor as compared with a case where the lower braking unit does not pressurize the wheel pressure.