Torque Distribution Control for Electric Drive Wheel Slip Optimization
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Solution Overview
Problem
Existing torque distribution technologies for electric vehicles do not consider independent control of each drive wheel and do not account for drive wheel slippage, leading to inefficient torque distribution and suboptimal motor efficiency.
Innovation Solution
A torque distribution apparatus that includes an instructed torque acquiring unit, a vehicular speed detecting unit, a drive wheel rotational speed detecting unit, a slip rate calculating unit, and a control unit, which uses a motor efficiency map to optimize torque distribution across multiple drive wheels by calculating slip rates and adjusting torque distribution values based on efficiency optimization curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If torque is distributed equally to multiple drive wheels, then device complexity is reduced, but motor efficiency deteriorates due to inability to optimize for individual wheel conditions
Solution Approach 1:
The patent segments the torque distribution control into independent calculations for each drive wheel. Instead of applying a single equal torque distribution, the system calculates optimal torque for each wheel individually based on its specific rotational speed and slip rate, then distributes torque accordingly. This segmentation enables personalized optimization for each wheel while maintaining manageable system complexity.
Solution Approach 2:
The patent implements dynamic torque distribution that continuously adapts to changing wheel conditions. The control unit dynamically adjusts torque distribution ratios based on real-time rotational speeds and slip rates of each drive wheel, rather than using static equal distribution. This dynamic approach allows the system to respond to varying operating conditions and maximize motor efficiency across different driving scenarios.
2Measurement precision
If torque distribution does not consider drive wheel slippage, then measurement precision requirements are reduced, but motor efficiency deteriorates due to suboptimal torque distribution
Solution Approach 1:
The patent incorporates feedback mechanisms that use detected slip rates and rotational speeds to continuously adjust torque distribution. The control unit receives feedback from sensors measuring wheel rotational speeds, calculates slip rates based on these measurements and vehicle speed, and uses this feedback information to optimize torque distribution in real-time. This closed-loop feedback system ensures that torque distribution remains optimized even as operating conditions change.
Solution Approach 2:
The patent changes the control parameter from simple equal torque distribution to torque distribution based on calculated slip rates and rotational speeds. By introducing slip rate as a key parameter in the torque distribution calculation, the system adapts its control strategy to actual wheel-road interaction conditions. This parameter change enables the system to optimize motor efficiency by accounting for varying traction conditions at each drive wheel.
3Use of energy by moving object
If independent control of each drive wheel is implemented, then motor efficiency is improved through optimized torque distribution, but device complexity increases
Solution Approach 1:
The patent applies local quality by tailoring torque distribution to the specific conditions of each drive wheel. Instead of uniform control, the system calculates and applies different torque distribution ratios for each wheel based on its local operating conditions (rotational speed and slip rate). This localized optimization allows each wheel to operate at peak efficiency for its specific conditions while the overall system complexity remains manageable through standardized calculation methods.
Data Source
AI summary
A torque distribution apparatus acquires an instructed torque input and a motor efficiency map for motors; detects vehicular speed and drive wheel rotational speed; calculates based on the detected speeds, a relational expression of drive wheel slip rate and a friction coefficient; creates based on the relational expression, a performance curve expression indicating relations between torque and the drive wheel rotational speed, superimposes the performance curve expression on the motor efficiency map, creates an efficiency variation expression indicating for each vehicular speed, the torque and efficiency values of the motor efficiency map, and calculates a torque that optimizes efficiency from the efficiency variation expression; calculates based on the instructed torque and the torque optimizing efficiency, a torque distribution value for each motor; and controls torque distribution to each motor, within a range of the slip rate being 0 to 0.2 and based on the torque distribution values.