Electric Booster Brake Kick-Back Control via Pressure Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The electric booster type brake system experiences a kick-back phenomenon due to a difference in hydraulic pressure between the first and second master cylinders when battery voltage is low, causing discomfort and anxiety for the driver during braking.
Innovation Solution
A system and method that includes sensors to detect pedal stroke, battery voltage, and vehicle speed, triggering a kick-back reduction mode to discharge high hydraulic pressure from the second master cylinder to the oil reservoir when low voltage and low speed are detected, reducing the pressure difference and preventing kick-back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electric booster type brake system uses a second master cylinder with a power piston driven by a motor to generate high braking hydraulic pressure, then braking force is improved, but a kick-back phenomenon occurs when battery voltage is low causing driver discomfort
Solution Approach 1:
The controller performs preliminary action by discharging the high hydraulic pressure from the second master cylinder to the oil reservoir in advance when low voltage and low speed conditions are detected, before the kick-back phenomenon can occur during braking operation
Solution Approach 2:
The system converts the harmful high hydraulic pressure that causes kick-back into a beneficial state by discharging it to the oil reservoir, transforming the potential harm into a safe condition where braking can proceed without kick-back discomfort
2Object-affected harmful factors
If the system discharges high hydraulic pressure from the second master cylinder to reduce pressure difference, then kick-back is reduced, but braking responsiveness may be affected
Solution Approach 1:
The system dynamically adjusts the hydraulic pressure state based on real-time detection of battery voltage and vehicle speed conditions, making the pressure discharge action conditional rather than static, thereby maintaining responsiveness when needed and reducing kick-back when appropriate
Solution Approach 2:
The controller changes the hydraulic pressure parameter by discharging high pressure from the second master cylinder to the oil reservoir, transforming the pressure state from high to low to eliminate the pressure difference that causes kick-back
3Object-affected harmful factors
If the system monitors battery voltage and vehicle speed to determine kick-back reduction mode, then kick-back control is improved, but device complexity increases
Solution Approach 1:
The system implements feedback by using sensors to continuously monitor battery voltage and vehicle speed, and the controller uses this feedback information to automatically determine whether to activate kick-back reduction mode, creating a closed-loop control system
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 solution effectively minimizes the kick-back phenomenon by ensuring braking is primarily facilitated by the hydraulic pressure from the first master cylinder, enhancing braking safety and comfort during low-speed and stop situations.
Implementation Method 1
a second pressure sensing sensor sensing a high hydraulic pressure generated by driving of a power piston of a second master cylinder according to driving of a motor
Implementation Method 2
a first pressure sensing sensor sensing a low hydraulic pressure generated in a first master cylinder
Implementation Method 3
the hydraulic pressure (high braking hydraulic pressure generated in advance in the power piston of the second master cylinder) of the high-pressure portion is discharged to the oil reservoir in advance by performing the high kick-back reduction mode of the controller to reduce the difference between the oil pressure of the high-pressure portion and the oil pressure of the low-pressure portion
Data Source
AI summary
The present disclosure provides a system and a method for controlling kick-back in an electric booster type brake system capable of reducing a kick-back phenomenon in which a hitting force is transmitted to a brake pedal due to a difference between a high braking hydraulic pressure already generated in a power piston of a second master cylinder by driving a motor and a low braking hydraulic pressure generated in a first master cylinder when a driver steps on a brake pedal, in a fall back situation in which electric power is not smoothly supplied to the motor due to a low voltage of a battery.