Engine Power Management via Torque Limiting for Overheat Prevention
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Solution Overview
Problem
Work machines experience overheating issues due to high ambient temperatures, leading to engine power reduction or failure, as existing cooling systems struggle to manage heat effectively, resulting in lost productivity and potential catastrophic failures.
Innovation Solution
A system incorporating hydraulic and coolant temperature sensors, an engine controller, and a machine controller that monitor temperatures and transmit torque limit commands to prevent overheating by reducing engine torque when temperatures exceed predetermined thresholds, and reinstating full power when temperatures fall below set levels for a predetermined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling system operates at maximum capacity in high ambient temperatures, then engine temperature is reduced, but engine power is limited due to heat generation exceeding cooling capability
Solution Approach 1:
The system proactively monitors hydraulic fluid and coolant temperatures and applies torque limits before catastrophic overheating occurs. By detecting temperature trends and predicting future thermal states, the system prevents engine failure by reducing load in advance, thereby maintaining both temperature control and power availability during normal operation.
Solution Approach 2:
The system continuously monitors hydraulic fluid temperature and coolant temperature, comparing readings against threshold values. When temperatures exceed predetermined thresholds, the system automatically transmits torque limit commands to the engine controller, creating a closed-loop feedback mechanism that dynamically adjusts engine power based on real-time thermal conditions.
2Productivity
If the engine operates at maximum power in high ambient temperatures, then productivity is maintained, but overheating occurs leading to engine failure or shutdown
Solution Approach 1:
The system proactively monitors hydraulic fluid and coolant temperatures and applies torque limits before catastrophic overheating occurs. By detecting temperature trends and predicting future thermal states, the system prevents engine failure by reducing load in advance, thereby maintaining both temperature control and power availability during normal operation.
Solution Approach 2:
The system establishes predetermined temperature thresholds that serve as safety margins before catastrophic failure occurs. By monitoring temperatures against these pre-set limits and taking corrective action when thresholds are approached, the system creates a buffer zone that prevents sudden engine shutdowns and maintains reliable operation under varying thermal conditions.
3Temperature
If torque is limited to prevent overheating, then engine temperature is controlled, but power output is reduced
Solution Approach 1:
The system dynamically adjusts engine torque based on real-time temperature conditions. When hydraulic fluid or coolant temperatures exceed predetermined thresholds, the system automatically transmits torque limit commands to the engine controller. When temperatures return to acceptable ranges, normal power operation is restored, creating a dynamic response that optimizes both temperature control and power utilization.
Data Source
AI summary
A work machine includes an engine power management system. The work machine includes an engine, a hydraulic temperature sensor, and a coolant temperature sensor. The hydraulic temperature sensor is configured to monitor and transmit a hydraulic fluid temperature, and the coolant temperature sensor is configured to monitor and transmit a coolant fluid temperature. The work machine also includes an engine controller and a machine controller. The engine controller includes a processor, and is operatively associated with the engine and the coolant fluid temperature sensor. The machine controller includes a processor, and is operatively associated with the hydraulic fluid temperature sensor and the engine controller. The machine controller is configured to transmit a torque limit command to the engine controller when the hydraulic fluid temperature or the coolant fluid temperature exceeds a predetermined temperature threshold.