Dual Core EGR Cooler Temperature Control
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Solution Overview
Problem
Heavy work vehicles face challenges in managing exhaust gas recirculation (EGR) cooler outlet temperatures effectively, which affects engine efficiency and emissions control, particularly under varying load conditions, leading to potential engine damage and increased fuel consumption.
Innovation Solution
A dual core exhaust gas recirculation (EGR) cooler system with two EGR valves and a bypass circuit, allowing exhaust gas to flow through either one or both cores depending on load conditions, thereby controlling outlet gas temperatures and optimizing emissions management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single core EGR cooler is used, then the device complexity is low, but the ability to control outlet gas temperature under varying load conditions is insufficient
Solution Approach 1:
The EGR cooler is divided into two separate cooling cores (first cooling core and second cooling core) that can operate independently or together. This segmentation allows selective activation of cooling paths based on load conditions, enabling precise temperature control without requiring a single overly complex system to handle all scenarios simultaneously.
Solution Approach 2:
The system incorporates multiple EGR valves (first EGR valve, second EGR valve, and third EGR valve) that dynamically switch between different cooling cores based on operating conditions. This dynamic configuration allows the cooler to adapt its structure and cooling capacity in real-time, optimizing temperature control for varying load conditions while maintaining reasonable device complexity through controlled adaptability.
2Reliability
If multiple EGR valves and dual core configuration are used, then emissions control and temperature management are improved, but the device complexity increases
Solution Approach 1:
The dual core EGR cooler with multiple valves serves multiple functions: it can operate in single-core mode for light loads, dual-core mode for heavy loads, and includes a bypass circuit for extreme conditions. This multi-functionality consolidates what would otherwise require separate systems into one unified device, improving emissions control reliability while managing complexity through functional integration rather than proliferation of separate components.
Solution Approach 2:
The control system acts as an intermediary that coordinates the multiple EGR valves and cooling cores. By centralizing control logic to manage the complex interactions between valves and cores, the system achieves reliable emissions control without requiring each component to be independently complex. The control intermediary simplifies the overall system management of the multi-valve, dual-core configuration.
3Use of energy by moving object
If exhaust gas temperature is not properly controlled, then fuel consumption increases and engine damage may occur, but implementing temperature control systems adds complexity
Solution Approach 1:
The system uses outlet temperature sensors that provide feedback to the control system, which then adjusts the EGR valves to maintain optimal temperatures. This feedback mechanism ensures proper temperature control to prevent engine damage and optimize fuel consumption without requiring overly complex systems, as the feedback loop automatically adjusts valve positions based on actual temperature conditions rather than requiring complex predictive control.
Solution Approach 2:
The dual core EGR cooler system is designed to self-regulate temperature based on operating conditions through its multiple valves and cooling paths. The system automatically selects appropriate cooling configurations (single core, dual core, or bypass) based on load conditions and temperature feedback, reducing the need for external intervention or complex control systems. This self-service capability improves fuel efficiency and protects against engine damage while keeping the control system relatively simple.
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 dual core EGR cooler system effectively manages outlet temperatures, reduces parts and complexity, and enhances emissions control without damaging the engine, while also improving fuel efficiency by fine-tuning gas temperatures.
Implementation Method 1
a cooling circuit extending from a coolant inlet through the cooler housing to a coolant outlet; a first EGR circuit core extending from the EGR inlet to the first EGR outlet
Data Source
AI summary
A dual core exhaust gas recirculation cooler includes a cooler housing having an EGR inlet, first and second EGR outlets, a cooling circuit extending from a coolant inlet through the cooler housing to a coolant outlet, a first EGR circuit core extending from the EGR inlet to the first EGR outlet, and a second EGR circuit core extending to the second EGR outlet from the EGR inlet or the first EGR outlet. A first EGR valve is configured to selectively couple the first EGR circuit core to a return passageway. A second EGR valve is configured to selectively couple the second EGR circuit core to the return passageway. The EGR valves are configured to selectively flow exhaust gas through the cooler housing within either the first EGR circuit core only or within both the first EGR circuit core and the second EGR circuit core.