Steered Axle Propulsion Control for Universal Joint Life
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Solution Overview
Problem
Existing electric vehicle propulsion systems, particularly in heavy-duty vehicles, face challenges in managing torque distribution between front and rear axles, leading to increased wear on universal joints and other components due to uneven torque application, which affects their lifespan.
Innovation Solution
A control unit is implemented to dynamically limit the propulsion torque provided to the steered axle based on its current state, including steering angle, lateral forces, and riding height, to optimize torque distribution and reduce wear on key components like universal joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rear axle electric machine is used to provide propulsion torque at high speeds, then the transport efficiency is improved, but the lifetime of universal joints deteriorates due to high propulsion torque
Solution Approach 1:
The patent applies dynamics by making the torque provision dynamic rather than static. The rear axle electric machine dynamically adjusts its torque contribution based on real-time steering angle feedback. When steering angle exceeds a threshold, the system automatically reduces or cuts torque to the rear axle, preventing excessive stress on universal joints while maintaining transport efficiency during normal cruising conditions.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the steering angle and using this information to adjust the torque distribution. The steering angle sensor provides real-time feedback to the control unit, which then modulates the torque from the rear axle electric machine accordingly. This closed-loop feedback mechanism ensures that torque is limited when steering angles indicate potential damage risks, thereby extending universal joint lifetime while preserving productivity during stable driving.
Data Source
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AI summary
The invention relates to a vehicle, comprising a first axle provided with at least a pair of first wheels, and a second axle provided with at least a pair of second wheels. The second axle is a steered axle allowing said second wheels to be turned. At least one first electric machine provides propulsion torque to the first axle. At least one second electric machine provides propulsion torque to the second axle. A control unit is configured to control the first and second electric machines, wherein the control unit is configured to limit the propulsion torque provided by said at least one second electric machine in dependence of a current state of the second axle. The invention also relates to a method for controlling the propulsion of a vehicle.