Traction Control Phasing by Vehicle Speed and Road Slope
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Solution Overview
Problem
Modern automotive vehicles with dual drivelines face challenges in efficiently managing torque distribution between primary and secondary drivelines, particularly in varying terrain and vehicle dynamics, leading to issues with slippage and energy consumption.
Innovation Solution
A traction control system that dynamically adjusts maximum drive torque and regenerative braking torque based on vehicle speed and road slope using a controller-driven electric propulsion motor, ensuring that rotary power transmitted to vehicle wheels does not exceed predetermined limits, thereby optimizing traction and energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maximum torque is transmitted to secondary driveline wheels to prevent slippage, then traction control is improved, but energy consumption increases and wheel slippage may still occur under varying terrain conditions
Solution Approach 1:
The system dynamically adjusts the maximum torque transmitted to the secondary driveline based on real-time vehicle speed and road slope conditions. The controller phases in torque at low speeds on steep slopes and phases out torque at higher speeds or on level terrain, optimizing the balance between preventing wheel slippage and minimizing energy consumption.
Solution Approach 2:
The system changes the torque parameter based on varying operating conditions. By monitoring vehicle speed and road slope, the controller adjusts the maximum torque limit transmitted through the secondary driveline, ensuring optimal traction control while reducing unnecessary energy expenditure when full torque is not required.
2Reliability
If secondary driveline applies pre-emptive drive torque, then wheel slippage is prevented, but device complexity increases
Solution Approach 1:
The secondary driveline applies pre-emptive drive torque before wheel slippage occurs, based on predicted terrain conditions. The controller anticipates slip conditions by monitoring vehicle speed and road slope, applying torque proactively to maintain traction and prevent slippage rather than reacting after slip occurs.
3Use of energy by moving object
If torque is adjusted based on vehicle speed and road slope, then energy consumption is optimized, but control system complexity increases
Solution Approach 1:
The control system continuously monitors vehicle speed and road slope conditions, using this feedback to dynamically adjust the maximum torque transmitted to the secondary driveline. This closed-loop control optimizes energy consumption by matching torque output to actual terrain and speed conditions, preventing both wheel slippage and unnecessary energy expenditure.
Data Source
AI summary
A traction control system and methodology that utilize a phase-out and phase-in of maximum drive torque and/or a regenerative brake torque based on vehicle speed and road slope.