ECU Diagnosis Data Transmission Timing Control
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Solution Overview
Problem
Existing electronic control systems in vehicles face challenges in distinguishing between diagnosis tools and publicly-sold display devices connected to dedicated connectors, leading to delays in remote diagnosis services as they cannot differentiate between temporary and permanent connections, resulting in incomplete data transfer for remote diagnosis.
Innovation Solution
The electronic control device includes a requested diagnosis data transmission unit that reserves data transmission when the ignition is ON and performs it when the ignition is OFF, ensuring data is transmitted to the management center without delaying off-board diagnosis processes, even when a publicly-sold external device is connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the in-vehicle ECU is configured not to perform the process about the remote diagnosis service when an external device is connected to the dedicated connector, then the off-board diagnosis process is not delayed, but the data required for the remote diagnosis service cannot be transferred to the management center when a display device is connected
Solution Approach 1:
The ECU performs preliminary actions by checking the ignition switch state and determining whether to postpone data transmission. When the ignition is OFF and no off-board diagnosis is needed, the ECU proactively transmits remote diagnosis data to the management center, preventing data loss while avoiding delays during active diagnosis periods.
Solution Approach 2:
The system dynamically adjusts its behavior based on the ignition switch state and connection status. The ECU transitions between two modes: (1) prioritizing off-board diagnosis response when ignition is ON, and (2) enabling remote diagnosis data transmission when ignition is OFF. This dynamic adaptation resolves the contradiction by allowing both functions to operate effectively under different conditions.
2Productivity
If the in-vehicle ECU prioritizes responding to diagnosis tool requests, then off-board diagnosis is performed without delay, but remote diagnosis data cannot be transmitted when a display device is permanently connected
Solution Approach 1:
The ECU implements periodic checking of the ignition switch state and connection status to determine appropriate data transmission timing. By periodically assessing conditions and transmitting data during ignition-OFF periods, the system ensures remote diagnosis data is sent without interfering with off-board diagnosis operations during ignition-ON periods.
Solution Approach 2:
The ECU performs preliminary assessment of the ignition state before attempting data transmission. When the ignition is detected to be OFF, the ECU proactively transmits accumulated remote diagnosis data to the management center, ensuring data is not lost while maintaining high productivity during ignition-ON diagnosis operations.
3Productivity
If the ECU transmits data immediately upon receiving transmission requests, then remote diagnosis service is efficient, but off-board diagnosis may be delayed when the ignition is ON and a device is connected
Solution Approach 1:
The ECU dynamically adjusts data transmission timing based on real-time ignition switch state. When ignition is ON, the ECU prioritizes off-board diagnosis requests and postpones remote diagnosis data transmission. When ignition is OFF, the ECU immediately transmits accumulated data, maximizing transmission efficiency without compromising diagnosis response time.
Solution Approach 2:
The ECU performs preliminary checking of the ignition state before transmitting data. By postponing transmission until ignition is OFF, the ECU ensures that data is sent immediately when conditions are favorable, maintaining high transmission efficiency while avoiding delays during critical diagnosis periods.
Data Source
AI summary
An electronic control device (ECU) reserves a transmission of a requested diagnosis data that is requested by a management center when an external device is connected to a dedicated connector, and when IGSW is turned ON. In such scheme, a delay of an off-board diagnosis process in the ECU is prevented when a diagnosis tool connected to the dedicated connector performs an off-board diagnosis. Further, after turning OFF of IGSW, the ECU, which is no longer due for a request from the external device connected to the dedicated connector, transmits the requested diagnosis data to the center, enabling the center to perform a remote diagnosis service. Therefore, the remote diagnosis service is performable when a commercially-available external device is connected to the dedicated connector by a user of a vehicle.