Trailing Axle Torque Control Using Leading Wheel Slip Prediction
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Solution Overview
Problem
Traditional traction and anti-lock braking systems in vehicles operate reactively, leading to significant wheel slip, which reduces grip, impairs safety, causes excessive wear, increases energy consumption, and generates noise, especially before slip occurs.
Innovation Solution
A method and control arrangement that proactively and predictively control wheel torque at trailing axles based on monitored slip at leading axles, speed, and distance, adjusting torque using a time delay to prevent significant slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reactive traction control and anti-lock braking systems are used, then the systems can operate with simple control logic, but significant wheel slip occurs which reduces grip and impairs safety
Solution Approach 1:
The control system proactively adjusts wheel torque at trailing axles based on wheel slip detected at leading axles, before the trailing wheels actually slip. This preliminary action prevents wheel slip from occurring in the first place, rather than reacting after slip has already happened. The system calculates a time delay based on vehicle speed and axle distance to determine when trailing wheels will reach slippery conditions, and adjusts torque accordingly in advance.
Solution Approach 2:
The system continuously monitors wheel slip at leading axles and uses this feedback to adjust wheel torque at trailing axles. This closed-loop feedback mechanism allows the system to adapt to changing road conditions in real-time, improving safety by preventing wheel slip based on actual sensor data from the leading wheels that have already encountered the slippery surface.
2Ease of manufacture
If traditional reactive braking systems are used, then the device complexity remains low, but excessive wear and tear of wheels and surface occurs
Solution Approach 1:
The system proactively reduces wheel torque at trailing axles before wheel slip occurs, based on detection at leading axles. This prevents the mechanical stress and friction that cause excessive wear to both the wheels and road surface. By acting in advance rather than reacting after slip occurs, the system minimizes unnecessary wear while maintaining relatively simple control logic.
3Use of energy by moving object
If traditional reactive powertrain control is used, then energy consumption is high due to wheel slip, but the control system remains simple
Solution Approach 1:
The control system proactively adjusts powertrain output and wheel torque at trailing axles based on wheel slip detected at leading axles, before the trailing wheels slip. This prevents energy loss from wheel slip by reducing torque in advance. The system calculates the time delay based on vehicle speed and distance between axles, allowing it to optimize energy consumption with relatively simple control logic that builds upon existing reactive systems.
Solution Approach 2:
The system uses feedback from wheel speed sensors at leading axles to continuously adjust powertrain control and wheel torque at trailing axles. This closed-loop approach optimizes energy consumption by preventing wheel slip based on real-time conditions, achieving better energy efficiency without requiring fundamentally complex control architecture.
4Object-generated harmful factors
If traditional reactive control systems are used, then the systems can respond to wheel slip, but noise is generated during the slip event
Solution Approach 1:
The control system proactively reduces wheel torque at trailing axles before wheel slip occurs, based on detection at leading axles. This prevents the noisy wheel slip event from happening in the first place, rather than attempting to mitigate noise after slip has already occurred. The system calculates the time delay based on vehicle speed and axle distance to determine when to reduce torque in advance, eliminating noise generation entirely.
Solution Approach 2:
The system uses real-time feedback from leading axle wheel speed sensors to continuously adjust trailing axle torque, preventing wheel slip and associated noise. This proactive feedback mechanism eliminates noise by preventing the slip condition rather than reacting to it, achieving quieter operation without sacrificing response capability.
Data Source
AI summary
A method is provided for controlling operation of a vehicle having at least one leading wheel axle and at least one trailing wheel axle. The method monitors a wheel slip of the wheels arranged at the at least one leading wheel axle and controls a wheel torque of the wheels arranged at the at least one trailing wheel axle based on: (i) the monitored wheel slip, (ii) a speed of the vehicle relative to the surface, and the distance between the at least one leading wheel axle and the at least one trailing wheel axle.