Engine Cylinder Wall Induction Heating for Cold Start PM Reduction
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Solution Overview
Problem
Existing engine technologies face challenges in quickly heating the cylinder liner after engine startup, which leads to insufficient vaporization of fuel and increased particulate matter generation due to low initial exhaust gas temperatures.
Innovation Solution
Incorporating an induction coil heater within a water jacket along the cylinder wall to generate an eddy current using alternating current, effectively heating the cylinder wall and liner regardless of engine startup status, without the need for close contact with the cylinder wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If exhaust gas is used to heat the cylinder liner, then fuel vaporization is improved and PM generation is suppressed, but this method is ineffective immediately after engine startup when exhaust gas temperature is low
Solution Approach 1:
An induction coil heater is introduced as an intermediary heating device installed in the exhaust passage. This mediator can actively generate heat through electromagnetic induction to warm the exhaust gas, enabling effective cylinder liner heating even when the exhaust gas temperature from the engine is insufficient immediately after startup.
Solution Approach 2:
The patent replaces the passive thermal system (relying solely on hot exhaust gas) with an active electromagnetic heating system. The induction coil uses electromagnetic fields to generate eddy currents in a heating member, converting electrical energy directly into heat, thereby overcoming the limitation of low exhaust gas temperature during cold startup.
2Temperature
If a heater is placed in contact with the cylinder wall for heating, then heating efficiency is improved, but manufacturing complexity increases due to the need for close contact
Solution Approach 1:
The heating function is extracted from the cylinder wall itself and implemented as a separate, independent heating member positioned in the exhaust passage. This separation allows the heater to be installed independently without requiring precise contact with the cylinder wall, significantly simplifying manufacturing and assembly while maintaining effective heating through the exhaust gas medium.
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
This solution ensures efficient vaporization of fuel on the cylinder liners, reducing particulate matter generation and improving manufacturing ease by eliminating the need for close contact heating and enhancing heat transfer efficiency.
Implementation Method 1
The induction coil is disposed in the water jacket and extends along the cylinder wall. The heater is configured to heat the cylinder wall by generating an eddy current in the cylinder wall by an alternating current flowing through the induction coil.
Implementation Method 2
The heater includes an induction coil... heat the cylinder wall by generating an eddy current in the cylinder wall by an alternating current flowing through the induction coil
Implementation Method 3
a water jacket extending along the cylinder wall... heating of the cylinder wall, a cylinder liner located inside the cylinder wall is heated
Data Source
AI summary
An engine includes a cylinder block including a cylinder wall, a cylinder liner, and a water jacket. The engine further includes a heater including an induction coil disposed in the water jacket. The heater is configured to heat the cylinder wall by generating an eddy current in the cylinder wall by an alternating current flowing through the induction coil.