Piston temperature model using a physics-based split multi-model approach

A physics-based piston temperature prediction model using an ECU optimizes fuel injection timing to reduce soot and emissions by integrating engine and coolant temperatures with spark timing, addressing the challenge of unpredictable piston temperatures in engine systems.

WO2026128301A1 Publication Date: 2026-06-18SAUDI ARABIAN OIL CO +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SAUDI ARABIAN OIL CO
Filing Date
2025-12-04
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing engine systems struggle to optimize fuel injection timing to reduce fuel impingement on pistons, leading to high soot formation and emissions due to unpredictable piston temperatures, which are crucial for emissions control.

⚗Method used

A physics-based split multi-model approach using an Electronic Control Unit (ECU) to predict piston temperature by integrating engine oil temperature, coolant temperature, spark timing, and engine speed, allowing for coordinated control of fuel injectors and spark plugs to optimize combustion timing.

🎯Benefits of technology

Accurately predicts piston temperature for real-time feedback, reducing particulate emissions and improving combustion efficiency by optimizing fuel injection timing, thus meeting stringent environmental regulations without requiring extensive data inputs or complex machine learning.

✦ Generated by Eureka AI based on patent content.

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Abstract

An engine (11) includes pistons (71), cylinders, at least one fuel injector (61), spark plugs (239), and piston cooling jets (91). The engine (11) includes an Electronic Control Unit (232) configured to receive an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The Electronic Control Unit (232) is configured to determine a non-firing piston temperature, coolant temperature and combustion phase modifier, and firing piston temperature. The Electronic Control Unit (232) outputs a predicted piston temperature. A method includes housing pistons (71) in cylinders, supplying air, injecting fuel, combusting an air-fuel mixture, spraying engine oil, and receiving an engine oil temperature, current coolant temperature, current spark value, calibrated spark value, current engine speed, and current engine torque. The method includes determining a non-firing piston temperature, coolant temperature modifier, combustion phase modifier, firing piston temperature, outputting a predicted piston temperature, and coordinating operations of the fuel injectors (61) and spark plugs (239).
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