Ignition Coil Current Feedback for Stable Spark Discharge Energy
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Solution Overview
Problem
The discharge energy of spark plugs in gasoline vehicles varies with the flow state inside the combustion chamber, leading to inconsistent ignition energy due to changes in arc resistance, which affects engine performance.
Innovation Solution
An ignition coil control system and method that adjusts discharge energy by measuring the current applied to the primary coil and adjusting a reference duty signal to maintain optimal energy levels between the center and ground electrodes, using a sensing part and an ignition controller to manage the pulse signals and prevent excessive or insufficient energy charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the flow inside the combustion chamber is strong (fast, turbulent), then the arc resistance around the electrode increases, but the discharge energy generated in the secondary coil is relatively reduced
Solution Approach 1:
The sensing part measures the current applied to the primary coil and feeds back this information to the ignition controller. The controller adjusts the reference duty signal based on the measured current to maintain optimal discharge energy despite variations in combustion chamber flow conditions
Solution Approach 2:
The system dynamically adjusts the reference duty signal parameters (period, pulse width) based on real-time current measurements. When current exceeds maximum threshold or falls below minimum threshold, the controller modifies the duty signal to maintain appropriate discharge energy levels
2Speed
If the flow inside the combustion chamber is weak (slow, calm), then the arc resistance around the electrode decreases, but the discharge energy generated in the secondary coil is relatively increased
Solution Approach 1:
The sensing part measures the current applied to the primary coil and feeds back this information to the ignition controller. The controller adjusts the reference duty signal based on the measured current to maintain optimal discharge energy despite variations in combustion chamber flow conditions
Solution Approach 2:
The system dynamically adjusts the reference duty signal parameters (period, pulse width) based on real-time current measurements. When current exceeds maximum threshold or falls below minimum threshold, the controller modifies the duty signal to maintain appropriate discharge energy levels
3Use of energy by moving object
If the current applied to the primary coil exceeds the maximum threshold value, then the charging energy is excessive, but this may cause ignition coil durability issues
Solution Approach 1:
The sensing part measures the current applied to the primary coil and feeds back this information to the ignition controller. The controller adjusts the reference duty signal based on the measured current to maintain optimal discharge energy despite variations in combustion chamber flow conditions
Solution Approach 2:
The system dynamically adjusts the reference duty signal parameters (period, pulse width) based on real-time current measurements. When current exceeds maximum threshold or falls below minimum threshold, the controller modifies the duty signal to maintain appropriate discharge energy levels
4Use of energy by moving object
If the current applied to the primary coil is less than the minimum threshold value, then the charging energy is insufficient, but the ignition energy requirement is not met
Solution Approach 1:
The sensing part measures the current applied to the primary coil and feeds back this information to the ignition controller. The controller adjusts the reference duty signal based on the measured current to maintain optimal discharge energy despite variations in combustion chamber flow conditions
Solution Approach 2:
The system dynamically adjusts the reference duty signal parameters (period, pulse width) based on real-time current measurements. When current exceeds maximum threshold or falls below minimum threshold, the controller modifies the duty signal to maintain appropriate discharge energy levels
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 system ensures consistent and appropriate ignition energy supply to the combustion chamber, predicting flow and pressure states to maintain efficient engine operation and extend ignition coil durability.
Implementation Method 1
a high voltage current (or a discharge current) is generated in a secondary coil due to electromagnetic induction of a current applied to a primary coil
Implementation Method 2
the air-fuel mixture injected into a combustion chamber during a compression stroke is ignited by a discharge phenomenon of the spark plug
Data Source
AI summary
An ignition coil control system includes: a plurality of ignition coils that respectively include a primary coil and a secondary coil; a spark plug that generates a spark discharge by a discharge current generated by the plurality of ignition coils and that includes a center electrode and a ground electrode; a sensing part measuring a current applied to the primary coil; and an ignition controller that adjusts a reference duty signal based on an amount of the current applied to the primary coil sensed by the sensing part to adjust discharge energy generated between the center electrode and the ground electrode through the secondary coil.