EPB Rear Wheel Speed Simulation for Anti-Lock Brake Testing
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Solution Overview
Problem
Existing methods for acquiring wheel speed information during EPB rear wheel anti-lock brake tests are inefficient, unstable, and can be dangerous, posing challenges for the development and testing of anti-lock brake systems.
Innovation Solution
A test method and equipment comprising a master computer, wheel simulation sets, and an EPB system with modules for motor control, signal simulation, and target wheel speed calculation, simulating wheel speeds using PWM waves and sensors, and integrating pressure feedback to achieve stable and efficient wheel speed simulation and acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheel speed information is acquired during vehicle running, then the anti-lock brake function can be tested, but the acquisition is difficult and dangerous in extreme cases
Solution Approach 1:
The patent creates a virtual wheel speed simulation system that copies real wheel speed characteristics through mathematical models and signal generation. Instead of acquiring data from actual vehicle running in dangerous conditions, the system generates simulated wheel speed signals that replicate real-world scenarios, eliminating safety hazards while maintaining testing reliability
Solution Approach 2:
The patent introduces a wheel speed simulation device as an intermediary between the test controller and the EPB system. This intermediary generates and provides simulated wheel speed signals to the EPB control unit, enabling safe testing while maintaining the functional relationship needed for anti-lock brake function verification
2Productivity
If wheel speed is acquired through vehicle running, then real wheel speed data can be obtained, but the testing efficiency is reduced
Solution Approach 1:
The patent pre-generates wheel speed simulation signals and prepares testing parameters before actual testing begins. The simulation device is configured with pre-calculated wheel speed characteristics, allowing immediate commencement of EPB anti-lock brake tests without time-consuming data acquisition from vehicle running
Solution Approach 2:
The system creates artificial wheel speed signals that copy real wheel speed characteristics through mathematical modeling. This copying approach eliminates the time required for actual vehicle running and data collection, significantly improving testing efficiency while maintaining test validity
3Ease of operation
If a virtual wheel speed simulation device is used, then testing can be safer and more efficient, but the device complexity increases
Solution Approach 1:
The wheel speed simulation device is designed as a multi-functional integrated system that combines signal generation, parameter configuration, and data provision functions. By making the simulation device universal, it can handle various testing scenarios without requiring separate systems, thereby managing complexity while providing comprehensive testing capabilities
Solution Approach 2:
The simulation device serves as an intermediary layer between the test controller and the EPB system, standardizing the interface and communication protocols. This intermediary role simplifies the overall system architecture by creating a clear separation of concerns, where the simulation device handles all wheel speed signal generation and management
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
The method provides a safer, more stable, and efficient simulation and acquisition of wheel speed, closely mimicking real-world conditions, enabling effective testing of EPB systems.
Implementation Method 1
the motor driver controls a rotating speed of the motor by outputting a PWM wave with a set frequency
Implementation Method 2
the wheel speed sensor senses a rotating speed of the gear
Data Source
AI summary
A test method of wheel speed simulation and acquisition equipment for an EPB rear wheel anti-lock brake test is provided. The equipment includes a master computer, wheel simulation sets and an EPB system with a wheel anti-lock brake function, where the master computer includes a motor rotating speed control module, an EPB-required signal simulation module and a target wheel speed calculation module; the wheel simulation sets include motor drivers, motors, gears and wheel speed sensors; outputs of the wheel speed sensors are connected into the EPB system; the motor rotating speed control module is connected with the motor drivers; the EPB system to be tested includes EPB calipers, pressure sensors are arranged in the EPB calipers; the target wheel speed calculation module calculates a target wheel speed and sends the target wheel speed to the motor rotating speed control module to complete the control of an actual wheel speed.