Electric Vehicle Headland Turning via Differential Wheel Speed Control

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Solution Overview

Problem

Conventional farm vehicles, particularly ICE-powered tractors, face challenges in headland operations due to operator fatigue and reduced productivity caused by the need for multiple operations like steering and inner wheel braking, leading to limitations in turning radius and stability, especially in varying soil conditions.

Innovation Solution

The implementation of a system that allows electric farm vehicles to selectively rotate outer wheels faster than inner wheels and front wheels faster than rear wheels, with the option to brake rear wheels, using independent or shared traction motors and sensors to adjust speed and braking based on field and vehicle conditions, thereby optimizing turning radius and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional ICE-powered tractors use mechanical transmission with single power source, then power distribution is simplified, but turning radius is limited and operator fatigue increases

Engineering Contradiction:

Improveoperator fatigueVSAvoidpower distribution system

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent divides the power distribution system into independent wheel motors, with each wheel having its own electric motor. This segmentation allows independent control of each wheel's speed and torque, enabling differential steering and reduced operator fatigue while eliminating the need for complex mechanical transmission systems.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces the mechanical transmission system with an electric power distribution architecture. Instead of using mechanical linkages and differentials to distribute power, the system uses independent electric motors controlled by electronic controllers, allowing for more flexible and precise control of wheel speeds and reducing operator workload.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If conventional tractors use mechanical drive connecting front and rear axles, then power transmission is straightforward, but variable wheelbase is restricted

Engineering Contradiction:

Improvevariable wheelbaseVSAvoidaxle connection system

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the drive system into independent wheel motors, allowing each wheel to operate independently without being mechanically coupled through a rigid axle connection. This enables the vehicle to achieve variable effective wheelbase through differential wheel speeds, improving adaptability for different field conditions and headland turn configurations.

Inventive Principle:

Principle #1Segmentation

3Productivity

If farmers make headland turns with conventional vehicles, then field operations continue, but 1-2% productivity is lost due to skipped rows

Engineering Contradiction:

Improvefield operation efficiencyVSAvoidproductivity loss during turns

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent implements dynamic speed control of individual wheels during headland turns. The system can rotate outer wheels faster than inner wheels and coordinate front and rear wheel speeds to optimize turning performance. This dynamic adjustment allows tighter turning radii and better maintenance of crop rows, reducing productivity loss during headland operations.

Inventive Principle:

Principle #15Dynamics

4Ease of operation

If vehicles make tight turns during headland operations, then maneuverability improves, but vehicle stability is compromised especially in varying soil conditions

Engineering Contradiction:

ImprovemaneuverabilityVSAvoidvehicle stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The patent applies local quality control by independently adjusting the speed and torque of each wheel based on local conditions. During turns, the system can apply braking to specific wheels or adjust their speed differently to maintain stability while achieving the desired turning radius. This localized control allows the vehicle to adapt to varying soil conditions during maneuvering.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent incorporates feedback control through sensors that monitor wheel speed, vehicle orientation, and ground conditions. The controllers continuously adjust wheel speeds and braking forces based on this feedback to maintain vehicle stability during tight turns, especially when operating in varying soil conditions that affect traction.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250098561A1Methods and systems for assisting an electric vehicle in headland operations

Publication Date: 2025.03.27 MAHINDRA & MAHINDRA LTD

AI summary

Embodiments herein disclose methods and systems for optimizing the productivity and improving the stability of electric vehicles by sensing field size and soil condition and automatically assisting the vehicle to turn by rotating inner wheels faster as compared to outer wheels of the vehicle and rotating front wheels of the vehicle faster as compared to rear wheels of the vehicle, and selectively braking respective wheel during headland operations. Embodiments herein enable operators to attain tight headland turns with lower head land space. Embodiments herein can detect a plurality of parameters such as, field conditions, soil condition, implements(s) connected to the vehicle, and so on, and control the turning radius of the vehicle as per requirement in at least one mode.