Electronic Brake Booster Control for Variable Vehicle Load
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Solution Overview
Problem
Existing brake systems fail to provide stable braking performance when the weight of a vehicle increases, requiring greater pedal force and resulting in insufficient braking power and increased braking distance, which can lead to accidents.
Innovation Solution
A brake control device and method that utilizes an auto leveling sensor to sense the vehicle's load state and an electronic brake booster to adjust braking power based on the sensed weight, ensuring consistent braking performance regardless of the vehicle's weight, and includes a speed sensor to ignore correction values when the deceleration rate exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a mechanical brake booster is used to amplify brake pedal force, then the braking power is increased, but the braking performance becomes insufficient when the vehicle weight increases
Solution Approach 1:
The brake booster is replaced with an electronic brake booster that dynamically adjusts the braking power based on real-time vehicle weight detection. The system uses a level sensor to detect vehicle attitude changes caused by weight variations, and the ECU calculates appropriate correction values to adjust brake cylinder pressure accordingly, making the braking power adaptive to different vehicle loads
Solution Approach 2:
The system changes the braking power parameter dynamically based on detected vehicle weight. When the vehicle weight increases (detected by vehicle pitch/roll angle changes via level sensor), the ECU increases the brake cylinder pressure beyond the standard amplified pedal force to compensate for the increased inertia, thereby maintaining consistent braking performance across different weight conditions
2Ease of operation
If the same brake pedal force is applied regardless of vehicle weight, then the ease of operation is maintained, but the braking distance increases when the vehicle is heavily loaded
Solution Approach 1:
The system implements a feedback mechanism where the level sensor continuously monitors vehicle attitude changes that indicate weight variations. This information is fed back to the ECU, which then adjusts the brake cylinder pressure accordingly. The feedback loop ensures that the braking force is automatically increased when the vehicle is heavily loaded, maintaining reliable braking distance without requiring the driver to apply different pedal forces
Solution Approach 2:
The traditional mechanical brake booster system is replaced with an electronic brake booster controlled by an ECU. This substitution allows for intelligent adjustment of braking force based on electronic sensors and processing, replacing the fixed mechanical amplification ratio with a dynamic electronic control system that can adapt to different vehicle weights while maintaining consistent driver input effort
3Measurement precision
If an ABS system accumulates braking data over time to calculate correction values, then the braking performance accuracy is improved, but the system requires a certain amount of time after driving starts before accurate correction can be applied
Solution Approach 1:
The system performs preliminary detection of vehicle weight using the level sensor before braking is needed. By continuously monitoring vehicle attitude and detecting weight-induced pitch/roll changes in advance, the system pre-calculates or pre-identifies the appropriate braking correction values, eliminating the need to accumulate braking data over time and enabling immediate accurate braking correction from the start of driving
Data Source
AI summary
The present invention relates to a brake control device and a brake control method for a vehicle comprising a plurality of brakes which are respectively installed on wheels, the brake control device comprising an auto leveling sensor which senses a load state of the vehicle according to a change in an angle; a control unit which calculates a correction value according to the load state of the vehicle sensed by the auto leveling sensor; and an electronic brake booster which corrects a predetermined braking power set according to a brake pedal force with the calculated correction value so that the braking operation of each brake is made.