Electronic Brake Diagnostics Using In-Motion Brake Effect Feedback
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Solution Overview
Problem
Existing methods for diagnosing electronic vehicle brake systems are inadequate as they cannot accurately determine the effect of a brake action while the vehicle is in motion, leading to potential safety issues due to undetected wear and tear.
Innovation Solution
A method that generates a test current value and an expected brake effect value, supplies a test current to the electric brake motor, measures the resulting brake effect, and compares it to the expected value to obtain a diagnostic result, allowing for accurate assessment of brake system performance while the vehicle is driven.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing diagnostic methods measure brake force when the vehicle is standing still, then the brake system can be tested without motion, but the method cannot accurately determine the effect of brake action while the vehicle is driving
Solution Approach 1:
The diagnostic method transitions from static testing (vehicle standing still) to dynamic testing (vehicle in motion). The system performs brake diagnostics while the vehicle is being driven, allowing measurement of brake effects under actual operating conditions. This enables accurate determination of brake action effects during vehicle operation, resolving the contradiction between measurement precision and adaptability.
Solution Approach 2:
The system uses feedback from sensors to measure the actual effect of brake actions while the vehicle is driving. The measured brake effect is compared with expected brake effect to generate diagnostic results. This feedback mechanism enables accurate real-time assessment of brake system performance during vehicle operation, simultaneously achieving measurement precision and operational adaptability.
2Reliability
If the vehicle is equipped with diagnostic capability to detect brake malfunction during driving, then safety is improved, but the device complexity increases
Solution Approach 1:
The diagnostic system leverages existing vehicle components (sensors, processors, communication systems) to perform brake diagnostics. The same sensors used for normal vehicle operation are utilized to measure brake effects, and the existing processor handles both control and diagnostic functions. This multi-functional approach improves brake system safety while minimizing additional device complexity.
Solution Approach 2:
The brake system performs self-diagnosis by using its own components to measure and evaluate its performance. The system generates test currents, measures actual brake effects, compares with expected effects, and produces diagnostic results autonomously. This self-service capability enhances reliability without requiring complex external diagnostic equipment.
3Measurement precision
If a test current is supplied to the electric brake motor during vehicle operation, then actual brake effect can be measured, but energy consumption increases
Solution Approach 1:
The system supplies test currents that are sufficient to generate measurable brake effects but are kept within reasonable limits. The test currents are designed to produce partial brake actions that can be accurately measured without requiring full braking force. This approach achieves measurement precision while controlling energy consumption during diagnostic operations.
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 provides an accurate diagnostic result by measuring the actual brake effect during vehicle operation, enabling early detection of performance degradation and preventing unsafe driving conditions.
Implementation Method 1
The forcing of the brake pad against the brake disc causes friction between the brake pad and the brake disc, and therewith a brake force is generated
Data Source
AI summary
The invention pertains to a method for diagnosing an electronic vehicle brake system, a vehicle comprising such an electronic vehicle brake system, a controller configured to for diagnose an electronic vehicle brake system and a computer program for diagnosing an electronic vehicle brake system. The method comprises the steps of generating a test current value and an expected brake effect value, instructing a brake power source of the electronic brake system to supply a test current to an electric brake motor of the electronic brake system, receiving a brake effect measurement value from a sensor of the vehicle, and obtaining a diagnostic result by comparing the brake effect measurement value with the expected brake effect value. Optionally, the brake effect comprises an increase in power supplied from a wheel motor power source to an electric wheel motor, such as an in-wheel motor, of the vehicle.