Multiplex Ignition Signal Transmission for Engine ECU
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Solution Overview
Problem
Conventional ignition devices for internal combustion engines require a large number of signal lines to achieve continuous spark discharge, increasing manufacturing costs and complexity.
Innovation Solution
The ignition device employs a multiplex signal transmission section to combine discharge continuous signals for multiple cylinders into a single multiplex signal, which is then extracted and processed by a cylinder signal extraction section, reducing the number of signal lines needed between the ECU and controller, and alternatively uses an integral signal transmission section to integrate ignition and discharge continuous signals for transmission over a single line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate signal lines are used for each cylinder's discharge continuous signal, then the control precision for each cylinder is improved, but the number of signal lines increases
Solution Approach 1:
The patent combines multiple discharge continuous signals for different cylinders into a single multiplexed signal line. The ECU outputs individual discharge continuous signals (IGW#1 to IGW#4) that are multiplexed together and transmitted through one shared signal line to the controller, which then demultiplexes them to achieve the same control precision with fewer lines
Solution Approach 2:
The single signal line serves multiple functions by carrying discharge continuous signals for multiple cylinders simultaneously. This universal signal line replaces what would traditionally require separate dedicated lines for each cylinder, achieving both signal transmission and cylinder identification through timing multiplexing
2Reliability
If multiple signal lines are used for ignition and discharge continuous signals, then the signal transmission reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple signal transmission functions into a single physical line through multiplexing. By combining discharge continuous signals for multiple cylinders into one line and using precise timing control, the system maintains signal transmission reliability while reducing the number of physical connections required, thereby lowering manufacturing costs
3Ease of operation
If separate signal lines are used for each cylinder, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The controller acts as an intermediary that receives multiplexed discharge continuous signals through a single line, demultiplexes them based on timing information, and distributes them to the appropriate cylinder control circuits. This intermediary approach maintains ease of operation by abstracting the complexity away from the ECU while still providing dedicated signal paths to each cylinder
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 configuration reduces the number of signal lines required, lowering manufacturing costs and simplifying the system while maintaining continuous spark discharge functionality.
Implementation Method 1
a high voltage is generated in the secondary coil of the ignition coil 3, and the main ignition of the spark plug is initiated
Implementation Method 2
The energy supply circuit 11 supplies electric energy to the primary coil 6... in order to supply a secondary current in a secondary coil 7 of the ignition coil 3
Data Source
AI summary
An ignition device for engine according to the present invention performs continuous spark discharge of an ignition plug by using a multiplex signal, an integration signal or a control signal. In the multiplex signal, discharge continuous signals IGW#1 to 4 for cylinders of the engine have been multiplexed. In the integration signal, a discharge continuous signal IGW and a secondary current instruction signal IGA have been added to an ignition signal IGT. In the control signal, the secondary current instruction signal IGA has been added into the multiplex signal or the integration signal. This structure can reduce the total number of signal lines connected between an ECU and a controller, and further reduce a signal line to transmit the secondary current instruction signal IGA.