Piston Cooling Jet Actuator for High-Strength Piston Heat Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines face challenges in heat removal from pistons made of higher strength materials with lower heat conductivity, which are used to withstand increased stress but hinder conventional heat dissipation.
Innovation Solution
The implementation of a piston cooling jet (PCJ) system that directs a controlled flow of coolant onto the piston, utilizing an actuator member with a controlled flow passage to ensure continuous coolant flow, even when biased towards a closed configuration, to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher strength materials such as steel are used to form pistons to withstand higher engine loading requirements, then the piston strength and durability are improved, but the heat conductivity decreases making heat removal more difficult
Solution Approach 1:
The patent extracts the heat removal function from the piston material itself and relocates it to a separate coolant delivery system. The PCJ delivers coolant directly to the piston surface, separating the structural material selection (steel for strength) from the thermal management function (coolant for heat removal).
Solution Approach 2:
The patent introduces coolant as an intermediary substance between the heat source (piston) and the heat dissipation medium. The coolant absorbs heat from the piston surface through direct contact, acting as a thermal mediator that enables effective heat removal from high-strength, low-conductivity materials.
2Temperature
If conventional cooling systems are used with higher strength piston materials, then the system complexity remains low, but the heat removal effectiveness is insufficient
Solution Approach 1:
The patent applies cooling only where it is most needed - directly at the piston surface experiencing highest thermal loads. The PCJ targets specific hot spots on the piston rather than implementing engine-wide cooling system changes, providing localized thermal management with minimal added complexity.
Solution Approach 2:
The patent uses hydraulic principles by delivering coolant through a controlled flow passage under pressure. The PCJ utilizes fluid dynamics to direct a targeted stream of coolant onto the piston surface, leveraging hydraulic flow control to achieve effective heat removal without complex mechanical moving parts.
3Temperature
If an actuator member with controlled flow passage is added to the PCJ to ensure continuous coolant flow, then the heat dissipation control is improved, but the device complexity increases
Solution Approach 1:
The patent introduces dynamic control capability to the PCJ through the actuator member, which can adjust the coolant flow rate in response to varying thermal demands. This allows the cooling system to adapt to changing engine operating conditions and piston thermal loads, providing active thermal management.
Solution Approach 2:
The actuator member serves multiple functions: it controls coolant flow rate, maintains continuous flow through the controlled flow passage, and can be integrated with existing engine control systems. This multi-functionality justifies the added complexity by providing comprehensive flow control capability within a single component.
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
The PCJ system effectively prolongs the operational life of pistons by improving heat dissipation, addressing the difficulty in removing heat from lower heat conductivity materials.
Implementation Method 1
a piston cooling jet (PCJ) mounted to direct a flow of coolant at the piston
Implementation Method 2
The higher strength materials, such as steel, stand up to higher engine loading requirements... While possessing properties that are desirable to withstand higher stress, the higher strength materials also have a lower heat conductivity
Data Source
AI summary
An internal combustion engine (ICE) including an engine block including a plurality of cylinders, a piston arranged in each of the plurality of cylinders, and a piston cooling jet (PCJ) mounted to direct a flow of coolant at the piston in each of the plurality of cylinders. The PCJ includes an inlet, an outlet, and a controlled flow passage allowing a substantially continuous flow of coolant to pass from the inlet to the outlet.