Transmission PTO Speed Control During Vehicle Travel

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Solution Overview

Problem

Existing powertrain systems face challenges in controlling power take-off outputs and transmission shaft outputs while avoiding unintended directional rotation, especially when the vehicle is traveling, due to complexities in accurately estimating torque at various locations along the powertrain.

Innovation Solution

A powertrain system that includes a transmission with a power take-off coupled via a planetary gear set, and a controller that operates the powertrain in a speed control mode, using vehicle speed feedback to control the output shaft speed and power take-off speed, thereby reducing the need for precise torque estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If torque estimation is implemented at transmission output shaft and power take-off, then control precision is improved, but system cost and complexity increase

Engineering Contradiction:

Improvetorque estimation accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the control objective from torque-based control to speed-based control. By controlling the speed of the output shaft and power take-off separately through the planetary gear set, the system eliminates the need for complex torque estimation at multiple locations, reducing sensor requirements and control complexity while maintaining effective power distribution control

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The planetary gear set serves multiple functions: it enables separate speed control of the output shaft and power take-off, provides mechanical power splitting without requiring torque sensors at each location, and allows the system to handle both vehicle motion and external load requirements simultaneously through a single integrated mechanism

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If torque estimation is implemented at transmission output shaft and power take-off, then control precision is improved, but implementation cost increases

Engineering Contradiction:

Improvetorque estimation accuracyVSAvoidimplementation cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent replaces expensive torque estimation systems with simpler, lower-cost speed sensing. By using speed feedback from the output shaft and power take-off through the planetary gear set, the system avoids the need for costly torque sensors and complex estimation algorithms, reducing implementation cost while maintaining effective control

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes mechanical torque measurement systems with a mechanical speed control system. The planetary gear set provides inherent mechanical relationships between input and output speeds, allowing control through speed regulation rather than torque measurement, thereby reducing sensor and control system costs

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If power take-off is activated while vehicle is traveling, then powertrain functionality is improved, but unintended vehicle movement risk increases

Engineering Contradiction:

Improvepowertrain functionalityVSAvoidvehicle movement control

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements speed feedback control for both the output shaft and power take-off. By continuously monitoring and controlling the speeds of these components through the planetary gear set, the system ensures that power distribution maintains proper mechanical relationships, preventing unintended vehicle movement while enabling the power take-off to operate during vehicle travel

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent enables dynamic operation of the power take-off during vehicle travel by using the planetary gear set to independently control the speed of the power take-off shaft while maintaining proper torque relationships. This allows the power take-off to be activated or deactivated dynamically without compromising vehicle motion control, enhancing powertrain versatility while maintaining reliability

Inventive Principle:

Principle #15Dynamics

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

This approach allows for effective control of the powertrain, reducing the likelihood of unintended vehicle movement and eliminating the need for costly torque estimation, thereby enhancing powertrain functionality and operational simplicity.

Implementation Method 1

The power take-off is coupled to the output shaft via a planetary gear set

Methodology Applied

Scientific EffectPlanetary gear mechanism: Gear

Data Source

PatentUS20250050889A1Control of transmission with activated power take-off

Publication Date: 2025.02.13 DANA BELGIUM

AI summary

A method and system for operating a powertrain that includes a transmission with two power take-off outputs and transmission output shaft is described. In one example, the powertrain is operated in a speed control mode whereby vehicle speed is controlled so that powertrain control may be simplified when a vehicle is moving and a power take-off is supplying power to an external device.