Engine Thermal Management Strategies and Fuel Efficiency

Effective thermal management of internal combustion engines is central to optimising fuel efficiency, reducing emissions and ensuring component longevity. Traditional approaches employ a liquid coolant circulated through a water jacket and heat exchanger to maintain optimal operating temperatures. Recent advances focus on adaptive control of coolant flow, waste-heat recovery and novel materials. Electrically driven pumps and variable-flow valves permit precise modulation of coolant distribution, reducing parasitic losses during warm-up and part-load conditions. Shape memory alloys and phase-change materials have been explored to accelerate engine and lubricant warm-up, minimising frictional losses inherent in cold starts. In heavy-duty applications, dual-cycle cooling architectures separate high-temperature subsystems from low-temperature circuits, yielding gains in energy saving and emission reduction. Model-based methods, including one-dimensional and three-dimensional simulations coupled with electronic control units, enable virtual testing of control strategies and early calibration of thermal functions. Multi-objective optimisation techniques have been applied to define pump speed maps and thermostat schedules that reconcile fuel consumption, thermal constraints and pump power. Collectively, these strategies underscore the interplay between hardware design, control algorithms and system-level integration, delivering measurable improvements in fuel economy across a broad spectrum of operating conditions.

Research from Nature Portfolio

Recent studies have introduced a dual-cycle cooling system for engineering vehicles that employs two interlinked coolant loops to manage high-heat sources separately from auxiliary circuits. Experimental evaluation demonstrated a reduction in hydraulic and transmission oil temperatures by over 10 °C and a 1 % per hour decrease in oil consumption under typical shovel-loading operations. The system also achieved overall engine energy savings by optimising heat rejection and reducing radiator size, signalling promising applications in heavy-duty machinery for energy saving and emission control.

Engine Thermal Management Strategies and Fuel Efficiency publication trend

The graph below shows the total number of articles in engine thermal management strategies and fuel efficiency across all publications each year (not limited to Nature Index journals).

Technical terms

Coolant: Working fluid employed to absorb and transport heat from the engine to a heat exchanger or radiator.

Thermostat: Temperature-sensitive valve that regulates coolant flow to maintain optimal engine operating temperature.

Dual-cycle cooling system: Arrangement of two interconnected coolant loops separating high-heat and low-heat zones for enhanced dissipation.

Model-in-the-loop (MiL): Virtual testing method that integrates detailed plant and control software models for early development of thermal control functions.

Shape memory alloy: Alloy that returns to a predefined shape when heated, enabling rapid actuation of thermal valves without external power sources.

References

1. A Novel Active Cooling System for Internal Combustion Engine Using Shape Memory Alloy Based Thermostat. Sensors (2023).
2. Experimental study of dual-cycle thermal management system for engineering radiator. Scientific Reports (2024).
3. Virtual Development of Advanced Thermal Management Functions Using Model-in-the-Loop Applications. Energies (2023).
4. Multiobjective optimization of the cooling system of a marine diesel engine. Energy Science & Engineering (2021).
5. Application of a Model-Based Controller for Improving Internal Combustion Engines Fuel Economy. Energies (2020).