ESC Braking Backup Control to Prevent Pedal Kickback
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Solution Overview
Problem
The electronic stability control (ESC) integrated braking system experiences a kickback phenomenon when it switches to a mechanical backup state due to a failure in pressure formation by the actuator in the master cylinder unit, resulting in reduced braking force and sudden pressure in the pedal simulator, which affects the driver.
Innovation Solution
A method of controlling the ESC integrated braking system involves maintaining braking force by closing designated oil pressure relief valves and switching to a mechanical backup state when pressure cannot be formed in the master cylinder unit, using a controller to manage the oil pressure relief valves and prevent kickback by ensuring the pressure in the pedal cylinder matches or exceeds the circuit pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ESC integrated braking system switches to a mechanical backup state when actuator failure occurs, then the system can continue to provide braking force through pedal force only, but liquid measure from the master cylinder unit flows into the pedal simulator causing sudden pressure and kickback phenomenon
Solution Approach 1:
The controller detects actuator failure and closes the oil pressure relief valve before the system fully transitions to mechanical backup state. This preliminary action prevents high-pressure liquid from the master cylinder unit from flowing into the low-pressure pedal simulator, thereby preventing kickback while maintaining braking functionality
Solution Approach 2:
The oil pressure relief valve acts as an intermediary component between the master cylinder unit and the pedal simulator. By controlling this valve's opening and closing, the system mediates the pressure differential between these two components, allowing safe transition to mechanical backup state without direct high-pressure liquid flow into the pedal simulator
2Force
If the oil pressure relief valve remains closed during normal braking, then braking force is maintained, but pressure equalization between pedal cylinder and circuit cannot occur
Solution Approach 1:
The oil pressure relief valve transitions from a static component to a dynamically controlled element. The controller adjusts the valve's opening and closing based on real-time system conditions (normal operation vs. failure state), enabling the valve to maintain braking force when closed and allow pressure equalization when opened, thus adapting to different operational requirements
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 method effectively prevents the kickback phenomenon by maintaining consistent braking force and pressure, ensuring a stable braking experience even when the system switches to a mechanical backup state.
Implementation Method 1
pressure formed in the pedal simulator is much smaller than pressure formed in the master cylinder unit
Implementation Method 2
a liquid measure formed in the master cylinder unit flows into the pedal simulator
Data Source
AI summary
Disclosed is a method of controlling an electronic stability control (ESC) integrated braking system, which includes, when a failure in which pressure is unable to be formed in a master cylinder unit is detected during braking of a vehicle by the ESC integrated braking system, maintaining, by a controller, a braking force applied during the braking by closing designated oil pressure relief valves for coupling the master cylinder unit and a flow channel of a circuit, and when pressure (PC1) of a pedal cylinder becomes equal to or greater than pressure (MC1) of the circuit based on the maintained braking force, by a brake pedal stepped on by a driver, controlling, by the controller, the designated oil pressure relief valves to be in an open state and then switching the state of the designated oil pressure relief valves to a mechanical backup state.