Neutral Operation Management for Vehicle Powertrain Protection
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Solution Overview
Problem
Modern vehicles face challenges in maintaining a sustained neutral state for extended periods, such as during towing or unattended parking, due to complex electrical systems that prevent mechanical shifting into neutral, leading to battery drain and component damage from Key-Off Load (KOL) and insufficient lubrication and cooling.
Innovation Solution
A sustained neutral management system that monitors operational parameters to automatically engage the vehicle motor, maintain transmission lubrication and cooling, and manage battery state to prevent damage, allowing remote start commands based on environmental and vehicle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle is placed in neutral gear for extended periods (towing, unattended parking), then the vehicle can be towed or parked conveniently, but the electrical systems prevent sustained neutral operation and cause battery drain
Solution Approach 1:
The system performs preliminary actions by automatically starting the engine before battery depletion occurs. The controller monitors battery state of charge and initiates engine start commands when thresholds are approached, preventing the harmful effect of battery drain while maintaining neutral operation capability.
Solution Approach 2:
The system enables self-service by having the vehicle automatically manage its own engine operation. The controller autonomously monitors operational parameters, determines when engine start is needed, and activates the engine without external intervention, allowing the vehicle to service itself during neutral operation.
2Ease of operation
If the vehicle is placed in neutral gear for extended periods, then towing or unattended parking is enabled, but transmission components suffer from insufficient lubrication and cooling
Solution Approach 1:
The system takes preliminary action by monitoring transmission fluid temperature and viscosity, and automatically starting the engine before damage occurs. This preventive approach ensures lubrication and cooling systems are activated in advance to protect transmission components during towing operations.
Solution Approach 2:
The system implements feedback by continuously monitoring transmission operational parameters including fluid temperature and viscosity. The controller uses this feedback to determine when engine activation is required to maintain proper lubrication and cooling, ensuring transmission protection throughout the towing process.
3Reliability
If conventional systems protect transmission gear selection during towing, then gear selection is protected, but they cannot protect vehicle components from electrical Key-Off Load (KOL) when in neutral state
Solution Approach 1:
The system achieves universality by creating a comprehensive protection mechanism that handles multiple functions simultaneously. The controller not only protects gear selection but also monitors and prevents electrical KOL damage, battery depletion, and transmission damage through a single integrated neutral operation management system.
Solution Approach 2:
The system enables self-service by having the controller autonomously manage multiple protection functions. It automatically detects harmful conditions including electrical KOL events and battery state of charge levels, and initiates appropriate protective actions without external intervention, safeguarding multiple vehicle components simultaneously.
4Adaptability or versatility
If electric drive train vehicles with permanent magnet traction motors are towed at higher speeds, then towing flexibility is improved, but the traction motor generates high voltage that can damage controller circuit boards
Solution Approach 1:
The system performs preliminary action by monitoring vehicle speed and motor voltage levels, and activating protective measures before voltage damage occurs. The controller preemptively manages powertrain operation to prevent harmful voltage generation during high-speed towing conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring traction motor voltage output during towing operations. The controller uses this real-time feedback to detect potentially damaging voltage levels and activate protective actions, enabling safe high-speed towing while preventing controller circuit board damage.
Data Source
AI summary
A method for managing electrical Key Off Load (KOL) and other potentially damaging operational conditions in a vehicle while in a neutral mode setting, comprising: determining a vehicle drivetrain is in the neutral mode setting; determining an operational characteristic that changes with time while the vehicle is in the neutral mode setting; performing, via a vehicle control module and based on the neutral mode setting and the operational characteristic, vehicle actions comprising engaging an automated start powertrain activation while the vehicle is in the neutral mode setting.