Turbocharged Engine Cylinder Deactivation for Overheating Control
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Solution Overview
Problem
Traditional fail-safe cooling strategies for turbocharged engines, such as alternate deactivation and air-cooling of engine cylinder banks, often fail to maintain cylinder head temperatures below engine metal melting temperatures, leading to engine disablement and insufficient torque for vehicle operability.
Innovation Solution
A method involving the selective deactivation of engine cylinders while limiting engine load in response to cooling system degradation or high cylinder temperatures, with the number of deactivated cylinders and load limits chosen to maintain engine speed below a threshold and keep cylinder temperatures below a specific overheating threshold, thereby reducing overheating and sustaining vehicle operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional fail-safe cooling strategies (alternate deactivation and air-cooling) are used, then engine overheating is addressed, but cylinder head temperatures still exceed metal melting temperatures leading to engine disablement
Solution Approach 1:
The patent changes the control parameters by introducing a third temperature threshold (greater than the second threshold) and dynamically adjusting the number of deactivated cylinders and load limits based on real-time temperature monitoring. This allows the engine to operate at optimized parameters that maintain temperatures below the melting point while preserving operability.
Solution Approach 2:
The system continuously monitors cylinder head temperatures and uses feedback control to adjust the deactivation strategy. When temperatures approach the third threshold, the system automatically modifies the number of active cylinders and load parameters to maintain safe operating temperatures while ensuring sufficient torque for vehicle operation.
2Temperature
If more cylinders are deactivated to reduce temperature, then overheating is mitigated, but torque becomes insufficient for vehicle operability
Solution Approach 1:
The patent implements dynamic control by continuously adjusting the number of deactivated cylinders and load limits based on real-time temperature and operational conditions. The system transitions from static deactivation strategies to dynamic optimization, where the control parameters adapt to maintain both temperature safety and torque sufficiency for vehicle operability.
Solution Approach 2:
Instead of deactivating all cylinders or using excessive deactivation, the system applies partial deactivation optimized to the specific operating conditions. The controller determines the optimal number of cylinders to deactivate based on temperature thresholds and operational requirements, using precisely the right amount of deactivation to control temperature while preserving sufficient torque.
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 effectively mitigates engine metal overheating while maintaining vehicle driveability and operability by carefully managing engine cylinder deactivation and load limits, preventing engine shutdown and ensuring torque is sufficient for vehicle operation.
Implementation Method 1
Engines may be cooled by circulating coolant fluid such as water through passageways in the engine
Implementation Method 2
air-cooling the deactivated engine cylinder bank with un-combusted intake air
Data Source
AI summary
A method comprising in response to coolant loss in a turbocharged engine, deactivating one or more engine cylinders while limiting engine load of one or more active cylinders based on an engine speed, and a cylinder head temperature.