Ignition Control Unit Adjusts Energy for Cylinder Flow Irregularity
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Solution Overview
Problem
Existing methods for controlling internal combustion engines, such as those described in PTL 1, do not adequately consider the change in flow direction within the cylinder during spark ignition, leading to inefficient energy supply and potential ignition plug deterioration.
Innovation Solution
A control device with an ignition control unit that calculates an irregular flow ratio and corrects the ignition operation amount to ensure stable energy supply, taking into account the change in flow direction by adjusting the ignition timing and energy supply based on the irregular flow ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the turbulent flow intensity or flow velocity in the cylinder is increased to realize stable combustion under high dilution degree, then combustion stability is improved, but the spark discharge may be blown out and misfire may occur
Solution Approach 1:
The patent changes the energy supply parameter of the ignition plug based on the irregular flow ratio. When the irregular flow ratio is high (indicating irregular flow conditions), the control device increases the energy supply from the ignition plug to prevent misfire and ensure reliable ignition despite the blown-out spark discharge risk.
2Reliability
If a large amount of supply energy is supplied from the ignition plug to prevent misfire under irregular flow conditions, then ignition reliability is improved, but the ignition plug deteriorates faster
Solution Approach 1:
The patent introduces a feedback mechanism where the control device calculates the irregular flow ratio based on secondary voltage and continuously adjusts the ignition operation amount accordingly. This feedback control ensures that excessive energy is supplied only when necessary (high irregular flow ratio), preventing unnecessary deterioration of the ignition plug while maintaining reliable ignition when needed.
3Use of energy by moving object
If the irregular flow ratio is high indicating frequent flow direction changes during discharge period, then energy transfer efficiency decreases, but increasing energy supply increases ignition plug wear
Solution Approach 1:
The patent dynamically adjusts the ignition operation amount based on real-time calculation of the irregular flow ratio. Instead of using a fixed energy supply strategy, the system adapts the energy supply level according to the actual flow conditions, optimizing the balance between energy transfer efficiency and ignition plug durability.
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 approach allows for precise adjustment of ignition energy to prevent misfires and prolong the life of the ignition plug by ensuring stable combustion and reducing wear on engine components.
Implementation Method 1
an ignition plug provided in the internal combustion engine, and controls an ignition of an air-fuel mixture
Data Source
AI summary
Due to changes in a flow of an air-fuel mixture in a cylinder, reliable ignition due to spark discharge may not be possible. Therefore, an ignition control unit 24 includes a secondary voltage calculation unit 31 that calculates an average value of a secondary voltage generated on a secondary side of an ignition coil, an irregular flow ratio calculation unit 32 that calculates a ratio of cycles in which the average value of the secondary voltage is equal to or less than a set average value with respect to a cycle of the internal combustion engine in a predetermined period as an irregular flow ratio indicating that the flow of the air-fuel mixture in the cylinder is irregular, and an ignition operation amount correction unit 37 that corrects an ignition operation amount so that the irregular flow ratio is equal to or less than the set ratio value that is the target to be reached of the irregular flow ratio.