Engine Temperature Control via Rate-Limited Power Modulation
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Solution Overview
Problem
Smaller, downsized engines with boosted performance and direct fuel injection face challenges in maintaining engine temperatures within desired limits due to increased heat generation, making it difficult to prevent overheating and potential engine degradation.
Innovation Solution
Implementing a method to control engine temperature by limiting the rate of temperature change when below or above a threshold, adjusting engine power output based on temperature conditions, and utilizing control systems to manage turbochargers, throttle, and fuel injection to maintain optimal operating temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If boosting and direct fuel injection are used to improve engine performance and fuel economy, then fuel economy is improved, but engine temperature rises at a higher rate
Solution Approach 1:
The control system proactively monitors engine temperature and preemptively reduces boost pressure or fuel injection before the engine reaches critical temperature thresholds, preventing overheating while maintaining performance benefits
Solution Approach 2:
The system dynamically adjusts boost pressure and fuel injection rates based on real-time engine temperature conditions, allowing the engine to operate at optimal performance when cool and reducing power output when hot, resolving the contradiction between performance and temperature control
2Power
If engine power output is increased to meet torque requests, then performance is improved, but engine temperature exceeds desired levels
Solution Approach 1:
The control system continuously monitors engine temperature and uses feedback to modulate power output, reducing torque when temperature exceeds thresholds and restoring full power when temperature decreases, maintaining performance within thermal limits
Solution Approach 2:
The system changes operating parameters such as boost pressure, fuel injection rate, and air-fuel ratio in response to temperature conditions, allowing the engine to deliver maximum power when cool and limiting power output when hot
3Temperature
If the cooling system is oversized to handle peak temperature demands, then temperature control is improved, but device complexity and cost increase
Solution Approach 1:
The control system manages thermal load proactively by preemptively reducing power output before temperature reaches critical levels, allowing the use of a properly-sized cooling system without needing to oversize it for peak demands
Solution Approach 2:
By dynamically modulating engine power output based on real-time temperature conditions, the system prevents thermal overload that would require an oversized cooling system, enabling adequate cooling with a properly-sized system
Data Source
AI summary
A method for controlling engine temperature of an engine with a wide dynamic range is disclosed. In one example, the derivative of an engine temperature is assessed by a controller. The controller may adjust engine actuators to limit engine temperature in response to the derivative.