Dual-Electric Powertrain Layout for Drive Range and Auxiliary PTO
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Solution Overview
Problem
Transmission systems for working machines are complex and expensive due to the need for multiple shafts and axle stitches to provide both drive power and auxiliary power take-off, especially when both driving ranges and auxiliary power take-off are desired.
Innovation Solution
A powertrain system utilizing two separate electric machines for drive power and auxiliary power take-off, with a driving range transmission and countershaft to provide adaptable gear ratios, reducing the need for complex transmission components and minimizing axle stitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single internal combustion engine with power-split transmission is used to provide both drive power and auxiliary PTO, then both functions can be delivered, but the transmission system becomes very complex and expensive requiring many shafts and axle stitches
Solution Approach 1:
The powertrain is divided into two separate electric machines: a first electric machine dedicated to drive power delivery and a second electric machine dedicated to auxiliary PTO delivery. This segmentation eliminates the need for complex power-splitting mechanisms and multiple shafts, as each machine independently drives its respective function through separate direct-drive connections.
Solution Approach 2:
The battery serves as a universal energy source for both electric machines, and the electric machines themselves can operate in multiple modes (motoring and regenerative braking). This multi-functionality allows the simplified two-machine architecture to replace the complex single-engine power-split system while maintaining both drive and auxiliary PTO capabilities.
2Adaptability or versatility
If multiple shafts and axle stitches are used to provide both driving ranges and auxiliary power take-off, then both functions are achieved, but the powertrain becomes expensive and complicated
Solution Approach 1:
The transmission system is segmented into a first transmission for the first electric machine and a second transmission for the second electric machine. Each transmission is optimized for its specific function, eliminating the need for a single complex multi-function transmission with numerous shafts and axle stitches, thereby reducing manufacturing cost and complexity.
Solution Approach 2:
The auxiliary PTO function is extracted from the main drive train and implemented as a separate second electric machine with its own dedicated transmission. This extraction eliminates the need for complex power-splitting mechanisms and multiple shafts that would be required to simultaneously provide both drive power and auxiliary PTO through a single integrated system.
3Device complexity
If a single electric machine is used for both drive and auxiliary functions, then the system is simpler, but the machine cannot be optimally adapted to different operating ranges
Solution Approach 1:
The powertrain is segmented into two specialized electric machines: the first electric machine optimized for drive power delivery with its own transmission, and the second electric machine optimized for auxiliary PTO delivery with its own transmission. This segmentation allows each machine to be independently tuned to its specific operating range, achieving optimal performance that would be impossible with a single multi-function machine.
4Adaptability or versatility
If complex transmission components are used to split power from a single engine, then both drive power and auxiliary PTO can be delivered, but the system requires many shafts and axle stitches
Solution Approach 1:
The power delivery system is segmented into two independent electric machine-transmission pairs. The first electric machine with its transmission handles drive power delivery, while the second electric machine with its transmission handles auxiliary PTO delivery. This segmentation completely eliminates the need for complex power-splitting transmission components and multiple shafts that would be required in a single-engine architecture.
Solution Approach 2:
The mechanical power-splitting system with multiple shafts and axle stitches is replaced by an electrical architecture where the battery supplies electrical energy to two separate electric machines. This substitution eliminates complex mechanical transmission components while maintaining the ability to deliver power to multiple functions simultaneously.
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
The system allows for efficient and cost-effective operation by adapting each electric machine to its desired operating range, enabling a compact and inexpensive powertrain design with reduced complexity and fewer bearing points.
Implementation Method 1
An electric machine can be designed to transform electrical energy into mechanical energy
Implementation Method 2
the second electric machine with a second drive output shaft for the provision of an auxiliary PTO for the working machine
Implementation Method 3
an electric machine can also be designed for recuperation
Data Source
AI summary
The present invention relates to a powertrain (10) for a working machine, with a first electric machine (12) having a first drive output shaft (16) for providing drive power to the working machine and a second electric machine (14) having a second drive output shaft (24) for providing an auxiliary power take-off of the working machine. In addition, the powertrain (10) comprises a driving range transmission (18) with a countershaft (34). The driving range transmission (18) is designed to connect the first drive output shaft (16) to a driven axle (20) of the working machine, selectively either as a straight-through gear or, by way of a first gear ratio, by means of the countershaft (34). The second drive output shaft (24) is arranged coaxially with the countershaft (34). Furthermore, the invention relates to a working machine.