Hot Surface Igniter for Methanol Compression Ignition
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Solution Overview
Problem
Direct injection of methanol into compression ignition engines is hindered by methanol's high latent heat of vaporization and high ignition temperature, preventing successful compression ignition and leading to unburned methanol causing engine wear and reduced service life.
Innovation Solution
A hot surface combustion-supporting system comprising a hot surface igniter and a controller that performs temperature control, allowing for the successful ignition of methanol by maintaining an appropriate ignition temperature, thus ensuring normal engine operation and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If methanol is directly injected into a compression ignition engine, then fuel cost reduction and emission improvement are achieved, but ignition failure occurs due to high ignition temperature
Solution Approach 1:
A hot surface igniter is introduced as an intermediary device to bridge the gap between compression ignition conditions and methanol's high ignition temperature. The igniter provides a localized high-temperature surface that initiates methanol combustion, enabling reliable ignition without modifying the overall compression ignition cycle or fuel injection system.
2Reliability
If methanol cannot be ignited quickly, then fuel cost reduction is achieved through direct injection, but engine wear increases due to unburned methanol destroying lubricating oil film
Solution Approach 1:
The hot surface igniter performs preliminary ignition action by providing an active combustion source before the main fuel injection completes combustion. This preliminary heat source ensures rapid and complete burning of methanol, preventing unburned fuel from contacting and damaging the lubricating oil film on cylinder walls.
3Reliability
If a hot surface igniter is added to enable methanol ignition, then ignition reliability is improved, but system complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it controls the hot surface igniter operation, monitors engine parameters, and manages fuel injection timing. This multi-functionality consolidates control tasks into a single existing component (ECU), avoiding the need for separate control systems and minimizing overall system complexity despite adding the igniter.
4Stability of the object's composition
If temperature control of the hot surface igniter is implemented, then combustion stability is improved, but control system complexity increases
Solution Approach 1:
A temperature measurement thermocouple is integrated into the hot surface igniter assembly, providing direct temperature feedback to the controller. This feedback loop enables the controller to adjust igniter operation in real-time, maintaining optimal combustion conditions while using a simple, direct measurement approach that minimizes control complexity.
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 enables successful ignition of methanol, preventing engine wear and extending the service life of the engine by ensuring that methanol is properly combusted, even under varying conditions.
Implementation Method 1
a hot surface igniter (4), which is used for igniting fuel of an engine (6)
Implementation Method 2
a temperature measurement thermocouple, which is used for measuring an ignition temperature value of the hot surface igniter
Implementation Method 3
methanol produces no soot or low nitrogen oxide when burning
Data Source
Figure 1
AI summary
The present utility model relates to the technical field of combustion-supporting of compression ignition engines, and provides a hot surface combustion-supporting system of an engine, for solving the problem in the prior art that direct use of methanol by an engine is affected due to the fact that methanol cannot be directly compression-ignited. Said system comprises: a hot surface igniter, which is used for igniting fuel of an engine; and a controller, which is used for performing temperature control of the hot surface igniter, can also communicate with an ECU of the engine, and is used for receiving a control signal of the ECU and a pre-set temperature value, and controlling on or off of the hot surface igniter according to the received control signal and the pre-set temperature value. The use of fuel having high latent heat of vaporization or high ignition temperature such as liquefied natural gas (LNG) in a compression ignition engine faces the same problem, which is covered by the present utility model, and to which the present utility model is applicable.