Electronic Brake System Oil Level Trend Control
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Solution Overview
Problem
Electronic brake systems face challenges in maintaining maximum braking force when oil leaks, leading to insufficient oil levels in the reservoir, which can result in early conversion to fall back modes and reduced braking performance.
Innovation Solution
A control method that detects oil level changes over time, limits additional functions, and adjusts motor operation to optimize hydraulic pressure generation within a determined stroke range, ensuring maximum braking force is maintained even with oil leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake system operates in normal boosting mode, then maximum braking force is generated, but oil consumption increases leading to reservoir level decrease
Solution Approach 1:
The system dynamically adjusts the braking mode based on real-time oil level monitoring. When oil level decreases, the ECU automatically transitions from boosting mode to fall back mode, creating a dynamic adaptation to resource constraints while maintaining braking functionality
Solution Approach 2:
The system changes operational parameters by switching between different braking modes (boosting mode with full motor assistance vs. fall back mode with direct mechanical braking). This parameter change allows the system to maintain braking force within available oil constraints
2Reliability
If the system converts to fall back mode early due to low oil level, then oil leakage is avoided, but braking performance is reduced
Solution Approach 1:
The system performs preliminary monitoring of oil level trends and predicts future oil depletion. By detecting the decrease trend before complete depletion occurs, the system can plan mode transitions in advance, maintaining reliability while optimizing braking performance
Solution Approach 2:
The system continuously monitors oil level and provides feedback to the ECU, which adjusts braking mode accordingly. This closed-loop feedback ensures the system transitions to fall back mode at the optimal moment, maintaining both reliability and braking performance
3Force
If the system continues operating in boosting mode despite oil leakage, then braking performance is maintained, but oil amount decreases rapidly
Solution Approach 1:
The level sensor provides continuous feedback on oil quantity, enabling the ECU to monitor consumption rate and detect leakage trends. This feedback mechanism allows the system to maintain braking performance until oil depletion becomes unavoidable
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 improves driving safety by efficiently securing braking force during oil leaks, delaying the conversion to fall back modes and effectively utilizing remaining oil, thus ensuring intended braking performance.
Implementation Method 1
a hydraulic pressure supply device to generate hydraulic pressure by moving a piston using a rotational force of a motor
Implementation Method 2
a level sensor installed inside the reservoir, and an appropriate braking mode may be performed depending on the amount of oil in the reservoir
Implementation Method 3
a master cylinder connected to the reservoir to discharge oil according to a pressing force of a brake pedal
Implementation Method 4
supply the generated hydraulic pressure to a wheel cylinder provided on each of wheels
Data Source
AI summary
The present disclosure relates to a control method of a brake system including a reservoir in which oil is stored, wherein the control method includes detecting a first level of a liquid level of oil stored in the reservoir, detecting a second level of the liquid level of oil stored in the reservoir, determining a decrease trend of an oil amount stored in the reservoir based on a time point when the first level is detected and a time point when the second level is detected, and limiting at least one additional function based on the decrease trend of the oil amount.