Brake Torque Control for Wheel Spin Detection Without Speed Sensors
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Solution Overview
Problem
Existing brake traction control systems (BTCS) are ineffective in preventing left-right asymmetrical spins of vehicle wheels when a wheel speed sensor is out of order, inoperable, or in an abnormal state.
Innovation Solution
A brake apparatus and method that utilizes a processor to identify wheel spins based on engine control module signals and vehicle accelerations, even when wheel speed sensors fail, by applying braking torques corresponding to identified driving torques and reference torques adjusted for road slope and vehicle acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wheel speed sensors are used to detect wheel spin in BTCS, then wheel spin detection accuracy is improved, but system reliability deteriorates when sensors fail
Solution Approach 1:
The patent introduces an intermediary calculation method that uses engine torque data and vehicle acceleration as mediators to infer wheel spin status when sensors fail. The processor calculates reference wheel speed based on engine output torque and vehicle acceleration, comparing it with actual wheel speed to detect spin without relying solely on wheel speed sensors.
Solution Approach 2:
The system uses itself to detect wheel spin by leveraging its own engine torque output and acceleration capabilities. When wheel speed sensors fail, the processor performs self-diagnosis by calculating expected wheel speed from engine parameters and comparing it with actual measurements, enabling the system to maintain functionality using its inherent capabilities.
2Device complexity
If wheel speed sensors are removed or fail, then system complexity is reduced, but wheel spin detection capability deteriorates
Solution Approach 1:
The patent replaces the mechanical sensor-based detection system with a calculation-based detection method. Instead of relying on physical wheel speed sensors, the system uses the processor to calculate reference wheel speed from engine torque and acceleration data, substituting mechanical measurement with computational analysis.
Solution Approach 2:
The system uses engine torque and vehicle acceleration as intermediary parameters to infer wheel spin status. By calculating the relationship between engine output, vehicle acceleration, and wheel speed, the processor can detect wheel spin without direct sensor input from failed wheels.
3Productivity
If braking torque is applied to suppress wheel spin, then traction force is improved, but energy consumption increases
Solution Approach 1:
The patent applies partial braking torque only to the spinning wheel rather than braking all wheels. The processor identifies which specific wheel is spinning and applies braking torque selectively to that wheel, using only the necessary amount of braking force to suppress the spin while minimizing energy consumption and maintaining traction in non-spinning wheels.
Data Source
AI summary
A brake apparatus includes a brake configured to provide a braking torque to first and second wheels of a vehicle, and a processor configured to identify a driving torque of the vehicle based on an output of an engine of the vehicle, identify a reference driving torque based on a longitudinal acceleration of the vehicle, identify a spin of at least one wheel of the first and second wheels based on determination that the driving torque identified based on the output of the engine of the vehicle is greater than the reference driving torque identified based on the longitudinal acceleration of the vehicle, and control the brake to provide the braking torque to the at least one wheel in response to the identified spin of at least one wheel of the first and second wheels.