Hybrid AMT Layout for Engine-Off PTO and Retarder Operation
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Solution Overview
Problem
Existing hybrid vehicle drivetrains lack the ability to provide selected operations when the engine is off, particularly in cargo trucks, limiting their functionality and efficiency.
Innovation Solution
A hybrid automated manual transmission (AMT) architecture that includes an input shaft connected to a prime mover via an input clutch, with a motor generator connected via various gear systems to optimize speed ratios and maintain PTO and retarder capability, even when the engine is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing hybrid vehicle drivetrain architectures are used, then the system provides basic hybrid functionality, but the system lacks the ability to perform selected operations when the engine is off
Solution Approach 1:
The motor generator is integrated into the transmission system with multiple connection points (input shaft, countershaft, output shaft) allowing it to perform multiple functions: providing power when engine is off, regenerating energy during braking, and assisting during acceleration. This multi-functionality enables selected operations with the engine off without requiring separate systems.
Solution Approach 2:
The transmission system acts as an intermediary between the motor generator and the drivetrain components (PTO, retarder). By providing dedicated connection paths through gears and shafts, the transmission enables the motor generator to control and power specific components independently, allowing selected operations when the engine is off while maintaining overall system integration.
2Productivity
If motor generator is connected to optimize speed ratios, then operational efficiency is improved, but packaging space requirements increase
Solution Approach 1:
The motor generator is merged with the transmission system rather than being a separate accessory. The MG shares space with existing transmission components, and its connections are integrated into the gear train. This combining approach optimizes speed ratios for efficiency while minimizing additional packaging space requirements.
Solution Approach 2:
The motor generator and its connection mechanisms are nested within the existing transmission housing and component layout. By utilizing unused spaces and integrating MG connections within the transmission's existing structural envelope, the design achieves optimized speed ratios without significantly increasing overall packaging volume.
Data Source
AI summary
A hybrid automated manual transmission includes an input shaft configured to be connected to a prime mover by an input clutch. At least one splitter gear connectable to the input shaft. A main shaft is concentric with the input shaft and includes at least two main shaft gears connectable to the main shaft. At least one countershaft includes at least one first driven gears drivingly engaged with the at least one splitter gear and at least two second driven gears drivingly engaged with the at least two main shaft gears. A motor generator is drivingly connected to the input shaft.