Control Apparatus Error Detection and Redundant Instruction Filtering
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Solution Overview
Problem
Image forming apparatuses face challenges in maintaining stable and high productivity due to increased communication errors in serial communications, particularly when noise affects the communication line, leading to retransmissions that can cause unintended state transitions and operational failures.
Innovation Solution
A control apparatus that includes a determination unit to assess instruction data for errors, a communication unit to transmit reply data based on the determination, and a control unit that prevents control actions if the current instruction data matches previous data, thereby avoiding consecutive write or read operations that could cause state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If serial communication is used to reduce wiring area, then wiring area is reduced, but communication errors increase due to noise at high communication frequencies
Solution Approach 1:
The patent implements a feedback mechanism where the slave station sends an acknowledgment signal back to the master station to confirm successful data reception. The master station monitors this feedback to detect communication errors and triggers retransmission when errors are detected, thereby improving communication reliability while maintaining serial communication's wiring advantages
Solution Approach 2:
The patent employs preliminary error detection by adding check bits or parity bits to the transmitted data before communication occurs. This allows the receiving end to detect potential errors in advance and request retransmission, preventing erroneous data from being processed and maintaining high communication reliability
2Reliability
If retransmission is performed to correct communication errors, then communication reliability is improved, but unintended state transitions occur due to consecutive write operations
Solution Approach 1:
The patent applies preliminary anti-action by having the slave station check whether the received data differs from previously stored data before executing write operations. If the data is identical to previous data, the slave station prevents the write operation from occurring, thereby counteracting the potential harmful effect of unintended state transitions caused by retransmission
Solution Approach 2:
The patent introduces an intermediary comparison mechanism that mediates between the master station's retransmission and the slave station's execution. The slave station compares incoming data with stored data as an intermediary step, allowing it to distinguish between necessary updates and redundant retransmissions, thus preventing harmful consecutive write operations while maintaining communication reliability
3Speed
If communication frequency is increased to achieve equivalent transfer rate to parallel communication, then transfer rate is maintained, but communication errors occur more easily due to noise
Solution Approach 1:
The patent maintains high transfer rates through feedback-based error detection and retransmission mechanisms. The slave station sends acknowledgment signals to confirm successful reception, and the master station uses this feedback to determine whether retransmission is necessary, ensuring that data is transferred reliably at high communication frequencies without sacrificing speed
Solution Approach 2:
The patent replaces mechanical error handling (physical retransmission of all data) with an intelligent feedback system that selectively retransmits only erroneous data. This substitution allows the system to maintain high transfer rates by minimizing unnecessary retransmissions while still correcting communication errors caused by noise at high frequencies
Data Source
AI summary
A control apparatus configured to receive instruction data from a transmission unit and to control a controlled apparatus based on the instruction data includes a determination unit configured to determine an error in reception of the instruction data from the transmission unit, a communication unit configured to receive the instruction data from the transmission unit and to transmit reply data according to a result of determination of the determination unit to the transmission unit, a module configured to control the controlled apparatus based on the instruction data, and a control unit configured to, if a content of current instruction data received by the communication unit matches a content of previous instruction data received by the communication unit, control the module not to control the controlled apparatus based on the current instruction data.