Brake Pressure Pump Control for Lower Vehicle Power Draw
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Solution Overview
Problem
Existing brake control devices for vehicles consume excessive power due to continuous operation of the electric pump, even when the brake hydraulic pressure is constant, which is inefficient and wasteful.
Innovation Solution
The brake control device includes a pressure adjustment unit with an electric pump and pressure adjustment valve, and a controller that adjusts the hydraulic pressure in the wheel cylinder based on the operation amount of the brake operation member, ensuring the electric pump only operates when an increase in brake hydraulic pressure is required, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric pump operates continuously to maintain brake hydraulic pressure, then the brake pressure control reliability is improved, but the power consumption increases
Solution Approach 1:
The electric pump operates periodically rather than continuously. The control unit calculates the operation speed equivalent amount from the brake operation member's operation amount and only activates the pump when pressure increase is required, converting continuous operation into periodic action to reduce energy consumption while maintaining reliability
Solution Approach 2:
The electric pump's rotation speed is dynamically adjusted based on real-time braking conditions. The control unit calculates target rotation speed from the operation speed equivalent amount, making the pump speed variable rather than fixed, allowing the system to adapt to changing pressure requirements and minimize energy usage
2Speed
If the electric pump rotation speed is increased to improve pressure-rise responsiveness, then the brake pressure response time is reduced, but the power consumption increases
Solution Approach 1:
The electric pump rotation speed is made dynamic and variable based on calculated target rotation speed from operation speed equivalent amount. This allows the system to achieve high speed only when pressure-rise responsiveness is needed, rather than maintaining high speed continuously, thus improving response when required while reducing overall power consumption
Solution Approach 2:
The system changes the operation parameter (rotation speed) of the electric pump based on calculated requirements. By adjusting the rotation speed parameter dynamically according to operation speed equivalent amount, the system achieves optimal balance between pressure-rise responsiveness and power consumption
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 reduces power consumption by only increasing the electric pump's rotation speed when necessary, improving pressure-rise responsiveness and maintaining pressure adjustment accuracy while saving energy.
Implementation Method 1
an electric pump DC and a pressure adjustment valve UA, and adjusts hydraulic pressure Pa in a pressure adjustment fluid path HC between the electric pump DC and the pressure adjustment valve UA
Implementation Method 2
a pressure adjustment valve UA, and adjusts hydraulic pressure Pa in a pressure adjustment fluid path HC between the electric pump DC and the pressure adjustment valve UA
Data Source
AI summary
A brake control device adjusts a hydraulic pressure in a wheel cylinder in response to an operation amount of a brake operation member, and includes “a pressure adjustment unit that includes an electric pump and a pressure adjustment valve and adjusts hydraulic pressure in a pressure adjustment fluid path between the electric pump and the pressure adjustment valve”, and “a controller that controls the electric pump and the pressure adjustment valve”. The controller calculates an operation speed equivalent amount based on the operation amount, calculates a target rotation speed based on the operation speed equivalent amount, and controls the electric pump such that an actual rotation speed of the electric pump approaches the target rotation speed.