Primary Check System Serial Parallel Conversion Circuit
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Solution Overview
Problem
In multifunctional in-vehicle devices, the limited number of output ports in microcomputers restricts the ability to output all required signals, especially as the number of primary check circuits increases.
Innovation Solution
A primary check system that uses a control unit to output data as a serial signal via a serial communication line, which is then converted into a parallel signal by a serial and parallel conversion circuit and transmitted to multiple primary check circuits, allowing the system to be set to an active state during primary checks and inactive state otherwise, reducing the need for additional output ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of primary check circuits is increased to enhance safety coverage, then the safety check capability is improved, but the number of output ports required from the microcomputer increases
Solution Approach 1:
The patent divides the parallel data transmission into multiple serial time slots, segmenting the simultaneous port requirements into sequential transmissions. The microcomputer transmits check data to multiple primary check circuits through a single serial port by allocating different time slots to each circuit, thereby reducing the number of output ports needed while maintaining the ability to check multiple circuits.
Solution Approach 2:
The patent transitions from a spatial dimension solution (multiple parallel ports) to a temporal dimension solution (serial transmission with time slot allocation). By adding the time dimension to data transmission, the system can address multiple primary check circuits sequentially through a single port, effectively resolving the port shortage issue while enhancing safety coverage.
2Adaptability or versatility
If multiple signals are output simultaneously to support multifunctional operations, then the device functionality is improved, but the number of output ports increases beyond available ports
Solution Approach 1:
The patent segments simultaneous signal transmissions into sequential serial transmissions by dividing the data into multiple time slots. Each signal that would traditionally require a separate port is instead transmitted serially over time, allowing multifunctional operations to be supported with a limited number of output ports.
Solution Approach 2:
The patent implements periodic serial transmission of data to multiple primary check circuits by allocating specific time slots to each circuit. This periodic action pattern allows the microcomputer to systematically transmit check data to all required circuits using a single port, supporting multifunctional safety checks without increasing port count.
Data Source
AI summary
A primary check system includes: a control unit configured to output data for primary check to a plurality of primary check circuits as a serial signal via a serial communication line; and a serial and parallel conversion circuit configured to convert the data for primary check, that is received as the serial signal, into a parallel signal and transmit the parallel signal to the plurality of primary check circuits, and the control unit is configured to set the serial and parallel conversion circuit into an active state before a primary check is started, and set the serial and parallel conversion circuit into an inactive state when the primary check is completed.