Brake Control Device Low Voltage Anti-lock Mode
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Solution Overview
Problem
Conventional brake control devices stop anti-lock brake control when voltage is lowered, limiting the operational range of electrically-operated pumps and frequently requiring cessation of anti-lock brake control due to increased load and shared hydraulic circuits.
Innovation Solution
A brake control device with a front-wheel and rear-wheel hydraulic circuit system that includes an electrically-operated pump, capable of switching between a usual voltage mode and a low voltage mode, allowing anti-lock brake control to continue by adjusting fluid pressure intervals and gradients, ensuring braking force equivalence in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-lock brake control is stopped when voltage is lowered, then the electrically-operated pump can operate within its reliable voltage range, but the operational range of the brake control system is narrowed and anti-lock brake control cannot be performed at low voltages
Solution Approach 1:
The patent applies parameter changes by modifying the anti-lock brake control parameters (pressure increase interval and pressure increase gradient) according to the voltage level. When voltage is low, the system increases the pressure increase interval and reduces the pressure increase gradient, allowing the electrically-operated pump to operate reliably within its limited power output while still maintaining anti-lock brake control functionality across a broader voltage range
Solution Approach 2:
The patent implements dynamics by making the anti-lock brake control characteristics adaptive and variable based on voltage conditions. The control system dynamically adjusts the pressure increase interval and gradient based on detected voltage levels, transitioning between different control modes (normal mode at high voltage, limited mode at low voltage) to maintain operational effectiveness across varying electrical conditions
2Device complexity
If the front and rear wheel interlocking brake system shares the hydraulic circuit and electrically-operated pump with the anti-lock brake system, then device complexity is reduced, but the load on the electrically-operated pump increases causing more frequent cessation of anti-lock brake control
Solution Approach 1:
The patent applies partial action by implementing a limited anti-lock brake control mode when voltage is low. In this mode, the system performs anti-lock brake control with reduced intensity (longer pressure increase intervals and gentler pressure gradients) rather than completely stopping the function. This allows the shared electrically-operated pump to handle the combined load of both brake systems while maintaining sufficient anti-lock protection, preventing complete cessation of the control function
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
Enables continuous anti-lock brake control even at lower voltages, maintaining braking force levels and extending the operational range of the system without additional devices or complex mode switching, while minimizing vehicle deceleration reduction.
Implementation Method 1
a pressure of a brake fluid in the hydraulic circuit is increased by driving an electrically-operated pump provided to the hydraulic circuit
Data Source
AI summary
A brake control device for a brake system. The control device can perform both an interlocking brake control and an antilock brake control. The brake system includes a front-wheel hydraulic circuit, a front-wheel-side braking part; a rear-wheel hydraulic circuit, a rear-wheel-side braking part; and an electrically-operated pump which pressurizes the brake fluid. The brake control device includes a usual voltage mode where the interlocking brake control or the anti-lock brake control is performed when the supply voltage is a first voltage or more, and a low voltage mode where at least one of the interlocking brake control and the anti-lock brake control is performed in a limited manner when the supplied voltage is a second, lower voltage. An operation mode is changed from the usual voltage mode to the low voltage mode when it is determined that the supply voltage becomes lower than the first voltage.