EGR System Cylinder Block Water Jacket Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas recirculation systems are inefficient in controlling the amount of recirculated exhaust gas based on driving conditions and require large, heavy coolers to cool the recirculated exhaust gas, which hinders combustion and increases fuel consumption.
Innovation Solution
An exhaust gas recirculation system with a water jacket in the cylinder block for cooling recirculated exhaust gas, where a recirculation valve in the cylinder head controls the supply of recirculated exhaust gas to the intake manifold based on driving conditions, eliminating the need for an additional cooling apparatus and optimizing fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate cooler is used to cool the recirculated exhaust gas, then the cooling effect is achieved, but the device becomes large and heavy
Solution Approach 1:
The patent merges the cooling function with the existing water jacket structure in the cylinder block. The water jacket, which is already present for engine cooling, is utilized to cool the recirculated exhaust gas by allowing thermal contact between the coolant and the exhaust gas pathway, eliminating the need for a separate cooler device.
Solution Approach 2:
The water jacket is given a dual function: it serves both the traditional engine cooling purpose and the additional function of cooling recirculated exhaust gas. This multi-functionality approach allows the system to achieve exhaust gas cooling without adding dedicated cooling hardware, thereby reducing weight and complexity.
2Temperature
If a separate cooler is used to cool the recirculated exhaust gas, then the cooling effect is achieved, but the device complexity increases
Solution Approach 1:
The patent merges the cooling function with the existing water jacket structure in the cylinder block. The water jacket, which is already present for engine cooling, is utilized to cool the recirculated exhaust gas by allowing thermal contact between the coolant and the exhaust gas pathway, eliminating the need for a separate cooler device.
3Object-generated harmful factors
If exhaust gas is recirculated to reduce NOx, then nitrogen oxides are reduced, but combustion is hindered by cooling the recirculated exhaust gas
Solution Approach 1:
The patent implements dynamic control of the recirculation valve to adjust the amount of recirculated exhaust gas based on driving conditions. The valve can vary the recirculation ratio in real-time, allowing the system to optimize between NOx reduction and combustion efficiency depending on engine load and operating conditions.
Solution Approach 2:
The system changes the parameter of recirculation ratio dynamically. By controlling the recirculation valve opening degree, the system adjusts the quantity of recirculated exhaust gas to achieve optimal balance between nitrogen oxide reduction and maintenance of combustion efficiency under different operating conditions.
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 system effectively reduces nitrogen oxides in exhaust gas and improves fuel consumption by precisely controlling the recirculation of exhaust gas, while integrating cooling within the cylinder block, thus enhancing overall engine performance.
Implementation Method 1
a water jacket disposed in a cylinder block and configured for coolant to flow therein... configured such that coolant in the water jacket cools the recirculated exhaust gas
Data Source
AI summary
An exhaust gas recirculation system. A water jacket in a cylinder block is configured for coolant to flow therein. A cylinder head is attached to the cylinder block. A cylinder is disposed in the cylinder block and the cylinder head. An intake manifold runner is connected to an intake hole of the cylinder. An exhaust manifold runner is connected to an exhaust hole of the cylinder. A first recirculation gas pathway is disposed in the cylinder block, and receives recirculated exhaust gas from the exhaust manifold runner. A second recirculation gas pathway is disposed in the cylinder head, and has a first end connected to the first recirculation gas pathway and a second end connected to the intake manifold runner. A recirculation valve, mounted at the second recirculation gas pathway, controls supply of the recirculated exhaust gas to the intake manifold runner. An engine control unit controls the recirculation valve.