In-Wheel Motor Power Distribution Using Wheel Speed and Torque
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Solution Overview
Problem
Existing vehicle systems fail to account for varying rotational speeds of individual wheels when calculating power distribution ratios, leading to inefficiencies in power management.
Innovation Solution
A vehicle system incorporating in-wheel motors, a power storage device, rotational speed sensors, and a controller that calculates a power distribution ratio based on the required torque and rotational speed of each wheel, enabling independent power management for each wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power distribution ratio is calculated without considering individual wheel rotational speeds, then calculation complexity is reduced, but power distribution accuracy deteriorates
Solution Approach 1:
The patent segments the power distribution calculation into individual wheel-level computations. Each wheel's power distribution ratio is calculated independently based on its specific rotational speed and required torque, rather than using a unified vehicle-level calculation. This segmentation enables accurate power distribution to each wheel while maintaining manageable calculation complexity through modular processing.
2Productivity
If power distribution is optimized for each wheel individually, then vehicle performance is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic power distribution by continuously adjusting the power distribution ratio for each wheel based on real-time rotational speed and torque requirements. The system dynamically adapts to varying wheel conditions (such as different rotational speeds during cornering or slippery conditions) by recalculating and applying individualized power distribution ratios, thereby optimizing vehicle performance without requiring complex hardware modifications.
3Loss of energy
If rotational speed of each wheel is considered in power distribution calculation, then energy efficiency is improved, but calculation requirements increase
Solution Approach 1:
The patent changes the calculation parameters from vehicle-level aggregate values to wheel-level specific parameters. By using individual wheel rotational speeds and required torques as input parameters, the system calculates power distribution ratios that reflect actual energy needs of each wheel. This parameter change enables improved energy efficiency by directing power to wheels that need it most, while the calculation requirements remain manageable through the use of straightforward mathematical relationships.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise power distribution to each wheel, optimizing vehicle performance even in conditions with varying rotational speeds, ensuring maximum travel functionality and efficient energy use.
Implementation Method 1
a rotational speed detecting sensor configured to detect a rotational speed of each of the plurality of wheels
Implementation Method 2
a plurality of rotary electric machines, each configured to generate a driving force or a braking force for one of the plurality of wheels independently from other rotary electric machines
Data Source
AI summary
A vehicle includes: a plurality of wheels; a plurality of rotary electric machines, each configured to generate a driving force or a braking force for one of the plurality of wheels independently from other rotary electric machines; a power storage device configured to exchange electric power with the plurality of rotating electric machines; a processor configured to calculate a required torque of each of the plurality of wheels; a rotational speed detecting sensor configured to detect a rotational speed of each of the plurality of wheels; and a controller configured to calculate a power distribution ratio that is a distribution ratio of electrical power from the power storage device to the plurality of rotating electric machines based on the required torque of each of the plurality of wheels and the rotational speed of each of the plurality of wheels.