Vehicle Brake Motor Speed Control for Durability
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Solution Overview
Problem
Existing brake apparatuses for vehicles face challenges in enhancing the durability of electric motors that drive fluid pressure pumps, as they often operate at high rotation numbers, leading to premature wear and varying load conditions due to fluctuating brake pedal pedaling degrees.
Innovation Solution
A brake apparatus that includes a control fluid pressure generation device with a fluid pressure control valve and a fluid pressure pump, where the electric motor is rotated at a target rotation number to circulate a relief flow rate and apply control current to generate control fluid pressure, and a target rotation number is set based on the necessary discharge flow rate and brake fluid amount, optimizing motor operation and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electric motor is driven at high rotation number to increase discharge flow rate of fluid pressure pump, then responsiveness to brake operation is improved, but durability of electric motor deteriorates
Solution Approach 1:
The system dynamically adjusts motor rotation number based on actual brake fluid demand. The control unit calculates necessary discharge flow rate by considering master cylinder pressure, brake pedal operation amount, and relief flow rate, then sets motor rotation number accordingly. This dynamic adjustment allows the motor to operate at high speed only when necessary for responsive braking, while reducing speed during normal operation to extend durability.
Solution Approach 2:
The invention changes the operating parameters of the fluid pressure pump by adjusting motor rotation number based on calculated brake fluid requirements. Instead of maintaining constant high rotation number, the system varies the rotation number parameter according to actual demand, optimizing both responsiveness and motor durability through parameter optimization.
2Reliability
If motor rotation number is controlled to change discharge flow rate of pump, then durability of electric motor is improved, but responsiveness to rapid brake operation deteriorates
Solution Approach 1:
The control unit continuously monitors brake operation amount and master cylinder pressure, then calculates the necessary brake fluid discharge flow rate in real-time. This feedback mechanism ensures that when rapid brake operation occurs, the system detects the increased demand and immediately increases motor rotation number to provide sufficient brake fluid flow, maintaining responsiveness while avoiding unnecessary high-speed operation during normal conditions.
Solution Approach 2:
The system performs preliminary calculation of necessary discharge flow rate by considering master cylinder pressure and brake pedal operation amount before actual brake fluid delivery. This allows the control unit to anticipate the required motor rotation number and adjust it proactively, ensuring responsive brake operation while optimizing motor durability through precise flow rate matching.
3Stress or pressure
If brake fluid is made to escape from fluid pressure control valve to master cylinder, then control fluid pressure is adjusted, but energy loss increases
Solution Approach 1:
The invention extracts only the necessary amount of brake fluid from the master cylinder based on calculated demand, rather than circulating excessive brake fluid through the control valve. By calculating the precise discharge flow rate needed and adjusting motor rotation number accordingly, the system eliminates unnecessary brake fluid circulation and the associated energy losses, while still achieving proper control fluid pressure adjustment.
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 approach enhances the durability of the electric motor, reduces average power consumption, and minimizes operating noise while maintaining high performance in generating control fluid pressure, thereby improving the overall efficiency and longevity of the brake system.
Implementation Method 1
a fluid pressure pump having a discharge port communicating between the fluid pressure control valve and the wheel cylinders and a suction port communicating between the master cylinder and the fluid pressure control valve
Implementation Method 2
an electric motor configured to drive the fluid pressure pump
Implementation Method 3
a fluid pressure control valve connected between the master cylinder and the wheel cylinders
Data Source
AI summary
A brake apparatus includes: a master cylinder generating a master cylinder fluid pressure; a wheel brake device applying a braking force to the wheels; a control fluid pressure generation device including a fluid pressure control valve and a fluid pressure pump; an electric motor driving the fluid pressure pump; a control fluid pressure setting unit setting a control fluid pressure; wherein the control fluid pressure generation device rotates the electric motor to circulate a brake fluid and applies a control current to the fluid pressure control valve to thus generate the control fluid pressure in the fluid pressure control valve, and a target rotation number setting unit configured to calculate a pump-necessary discharge flow rate and a brake fluid amount, and set a target rotation number of the electric motor based on the pump-necessary discharge flow rate.