Electronic Brake System Temperature Compensation
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Solution Overview
Problem
Existing electronic brake systems fail to generate a consistent braking force as desired by the driver due to variations in brake disk temperature and humidity, leading to inadequate deceleration.
Innovation Solution
An electronic brake system with a control unit that estimates the temperature and friction coefficient of the brake disk pad, adjusts the target pressure and torque factor compensation ratios based on these estimates, and performs hydraulic control to maintain a consistent braking force, integrating regenerative braking cooperative control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking pressure is generated according to pedal force without temperature compensation, then the brake system structure remains simple, but the deceleration becomes inconsistent with driver's intention due to temperature variations
Solution Approach 1:
The control unit pre-stores multiple target pressure compensation ratios corresponding to different temperature ranges of the brake disk. Before actual braking, the system can estimate the brake disk temperature and select the appropriate compensation ratio in advance, rather than calculating it in real-time during braking. This preliminary preparation of compensation data resolves the contradiction by enabling consistent deceleration control without requiring complex real-time calculation systems.
Solution Approach 2:
The system incorporates a brake disk temperature sensor that provides real-time temperature feedback to the control unit. The control unit continuously monitors the temperature and dynamically adjusts the target pressure compensation ratio based on the current temperature condition. This feedback mechanism ensures that the braking force remains consistent with driver's intention across varying temperatures while maintaining a relatively simple control structure through direct temperature-based compensation.
2Measurement precision
If temperature compensation is implemented to maintain consistent deceleration, then deceleration accuracy improves, but the control algorithm and system complexity increase
Solution Approach 1:
The control unit pre-stores multiple torque factor compensation ratios corresponding to different temperature ranges in memory. When temperature compensation is needed, the system simply retrieves the appropriate pre-calculated compensation ratio based on the current temperature, rather than performing complex real-time friction coefficient calculations. This approach achieves high deceleration accuracy while keeping the control algorithm simple through pre-computation of compensation parameters.
Solution Approach 2:
The system changes the control parameter from direct friction coefficient calculation to temperature-based compensation ratio selection. By using temperature as the primary parameter and having pre-stored compensation ratios for different temperature ranges, the system achieves precise deceleration control without requiring complex friction model calculations, thus simplifying the control algorithm while maintaining high accuracy.
3Power
If regenerative braking pressure is reduced, then friction braking pressure must be increased to compensate, but this increases the overall braking system complexity
Solution Approach 1:
The control unit merges the control of regenerative braking and friction braking into a single integrated hydraulic control system. By calculating the difference between the target pressure (adjusted with compensation ratio) and the actual regenerative braking pressure, the system determines the required friction braking pressure in one unified calculation. This merging approach achieves the necessary braking force compensation without requiring separate complex control systems for regenerative and friction braking.
Solution Approach 2:
The system uses hydraulic pressure as the unified medium to transmit and balance the braking force between regenerative and friction braking systems. The control unit calculates the required friction braking pressure based on hydraulic pressure differences, leveraging the hydraulic system's natural ability to transmit and equilibrate pressure. This hydraulic approach simplifies the overall control by using pressure balance rather than requiring separate mechanical control mechanisms.
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
Ensures a consistent deceleration is achieved regardless of external temperature changes, enhancing the reliability and safety of the braking system by compensating for temperature-induced variations in friction coefficient and regenerative braking pressure.
Implementation Method 1
The temperature estimating unit may estimate the temperature of the disk pad by checking the temperature change of the disk pad caused by external temperature and humidity and frictional heat due to continuous use of the brake disk pad
Implementation Method 2
the friction coefficient estimating unit may estimate a friction coefficient of the disk pad on the basis of the estimated temperature
Implementation Method 3
a hydraulic pressure device configured to generate and supply a brake hydraulic pressure to wheel cylinders
Implementation Method 4
a brake mechanism configured to generate a braking force on the basis of a brake hydraulic pressure supplied by the hydraulic pressure device
Data Source
AI summary
Provided are an electronic brake system and a method of controlling the same. The electronic brake system includes a pedal input unit configured to receive a pedal force according to a driver's braking intention, an estimating unit configured to estimate a temperature and a friction coefficient of a brake disk pad, and a control unit configured to correct a braking target pressure according to the driver's braking intention on the basis of the estimated temperature and friction coefficient of the brake disk pad.