Brake Control Device Auxiliary Power Management
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Solution Overview
Problem
Brake control devices that switch to an auxiliary power supply when the main power supply fails require a large auxiliary power source, which is problematic in terms of vehicle loadability.
Innovation Solution
A brake control device comprising a master cylinder, an electric motor, and a control circuit that calculates the demanded braking force based on brake-pedal operation, using electric power from both the main and auxiliary power sources, with the electric motor controlled to generate the required braking force, and the auxiliary power source supplying power to the control circuit during main power source abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large auxiliary power supply source is used to ensure sufficient power during main power supply failure, then the reliability of brake operation is improved, but the vehicle loadability deteriorates
Solution Approach 1:
The patent applies partial action by providing power supply for only a portion of the brake control functions during main power supply failure. The auxiliary power supply source (uninterruptible power supply) provides power specifically to the control circuit to maintain basic brake control functions, rather than providing full power for all system operations. This allows the auxiliary power supply to be smaller in capacity, reducing vehicle loadability concerns while still ensuring reliable brake operation during power failures.
Solution Approach 2:
The power supply system is segmented into multiple independent sources: a main power supply source for normal operation and an auxiliary uninterruptible power supply source for backup. The control circuit is designed to selectively switch between these sources and to distribute auxiliary power only to critical functions. This segmentation allows the auxiliary power supply to be smaller while still providing sufficient power for essential brake control operations during main power supply failure.
2Weight of moving object
If the auxiliary power supply source is made smaller to improve vehicle loadability, then the vehicle loadability is improved, but the ability to supply sufficient power during main power supply failure deteriorates
Solution Approach 1:
The control circuit is designed to operate in a reduced functionality mode when powered by the auxiliary uninterruptible power supply. It provides power only for essential brake control functions rather than full system operation, allowing the auxiliary power supply capacity to be smaller while still meeting the minimum power requirements for safe brake operation during main power supply failure.
Solution Approach 2:
The control circuit dynamically adjusts its power consumption parameters based on the power source being used. When operating on auxiliary power, it limits power draw to levels that the smaller uninterruptible power supply can sustain, while still maintaining sufficient performance for brake control. This parameter adjustment allows the system to match power supply capacity with actual operational needs.
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 improves vehicle loadability, safety, and reliability by allowing efficient operation with reduced power consumption from the auxiliary source during main power source failures.
Implementation Method 1
an electric motor for controlling hydraulic pressure in the master cylinder
Implementation Method 2
a master cylinder for generating hydraulic pressure to generate a braking force
Data Source
AI summary
According to the present invention, limited electric power is consumed so as to achieve long-lasting use of electric power during brake control with the use of an auxiliary power supply source when there is a malfunction of a vehicle power supply source. In addition, a brake control device for ensuring responsiveness at the beginning of braking or when emergency braking is necessary is provided. The brake control device of the present invention is a brake control device for detecting electric signals generated depending on the degree of brake-pedal operation and calculating the driver's demanded braking force based on the electric signals so as to generate the demanded braking force, which comprises an auxiliary power supply source for supplying electric power to the brake control device when there is a malfunction of a vehicle power supply source and controls braking depending on the charged capacity of the auxiliary power supply source.