Engine Torque Control for Power Take-Off Gear Protection
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Solution Overview
Problem
Existing motor vehicle transmission systems lack effective control over engine torque when operating a power-take-off (PTO) unit, particularly when stationary and in neutral, which can exceed the torque capacity of the transmission's PTO drive gear, potentially leading to damage.
Innovation Solution
An apparatus and method utilizing a transmission control module to monitor and limit engine torque through a data link connecting the engine and transmission control modules, ensuring the torque does not exceed the maximum defined value of the PTO drive gear by activating the PTO unit only under predetermined conditions and broadcasting the maximum torque value to the engine control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission operates a power-take-off unit without torque control, then the PTO unit can be activated freely, but the engine torque may exceed the maximum torque capacity of the PTO drive gear causing potential damage
Solution Approach 1:
The transmission control module continuously monitors engine torque through the data link and compares it against the maximum torque capacity of the PTO drive gear. When torque approaches the limit, the system provides feedback to the engine control module to reduce torque output, preventing damage while allowing flexible PTO operation within safe parameters
Solution Approach 2:
The system pre-establishes the maximum torque capacity value of the PTO drive gear in the transmission control module before operation. This preliminary configuration enables the control system to proactively prevent torque exceedance by controlling engine torque output before damage can occur, rather than reacting after failure
2Reliability
If the transmission control module monitors and limits engine torque through data link communication, then the PTO drive gear is protected from excessive torque, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The transmission control module performs its existing function of monitoring transmission operation while simultaneously taking on the additional function of monitoring engine torque and controlling PTO torque limits. The engine control module similarly maintains its engine management functions while adding PTO torque control capabilities. This multi-functionality approach protects the PTO drive gear without requiring completely separate dedicated control systems
Solution Approach 2:
The data link serves as an intermediary communication channel between the transmission control module and engine control module. Rather than requiring direct mechanical linkages or complex wiring between control systems, the existing data link infrastructure enables torque information exchange and coordinated control, simplifying the overall system architecture while achieving reliable torque protection
Data Source
AI summary
An apparatus and method is provided for controlling torque in a powertrain having an engine and a transmission capable of operating a power take-off unit. The apparatus includes: a controller selectively operable to send a power take-off unit activation request to a transmission control module within the powertrain; a transmission control module capable of receiving the power take-off unit activation request; and wherein the apparatus is configured to prevent the torque of the engine from exceeding a maximum defined torque value when the power take-off unit is in operation. The apparatus includes an engine control module capable of receiving commands from the transmission control module through a data link connecting them.