ECU Driving Mode Control for Diagnosis Execution Rate
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Solution Overview
Problem
Conventional electronic control units (ECUs) for automatic driving vehicles face challenges in achieving a required diagnosis execution rate while maintaining riding comfort, as they often degrade vehicle comfort by controlling the engine differently during automatic driving.
Innovation Solution
An ECU that receives surrounding environment and vehicle speed information to set driving modes and prioritize diagnosis items, controlling the motive power source to satisfy diagnosis conditions within the most suitable driving mode, thereby optimizing diagnosis execution rate without compromising comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ECU controls the engine differently from normal automatic driving to satisfy the failure diagnosis execution condition, then the diagnosis execution rate is improved, but the riding comfortableness is degraded
Solution Approach 1:
The system dynamically adjusts the driving mode based on the diagnosis execution rate. When the diagnosis execution rate is insufficient, the ECU switches to a diagnosis priority driving mode that modifies engine control to satisfy diagnosis conditions. When the diagnosis execution rate meets the target, the system returns to normal driving mode, thereby dynamically balancing diagnosis requirements with riding comfort.
Solution Approach 2:
The ECU changes engine control parameters when switching between normal driving mode and diagnosis priority driving mode. By adjusting parameters such as injection timing, ignition timing, or throttle control, the system creates conditions that satisfy diagnosis execution requirements while minimizing impact on riding comfort through controlled parameter modifications.
2Productivity
If more trips are made to perform failure diagnosis processing to attain the required diagnosis execution rate value, then the diagnosis execution rate is improved, but the time required for diagnosis is increased
Solution Approach 1:
The system performs preliminary assessment of diagnosis execution rate and proactively switches to diagnosis priority driving mode before the diagnosis execution rate becomes insufficient. This preliminary action prevents the need for multiple additional trips by ensuring diagnosis conditions are met during the current driving cycle, thereby reducing total diagnosis time.
Solution Approach 2:
The ECU continuously monitors the diagnosis execution rate and provides feedback to the driving mode determination logic. When the diagnosis execution rate falls below the target value, the feedback triggers a switch to diagnosis priority driving mode, creating a closed-loop control system that efficiently achieves diagnosis goals without unnecessary time delays.
Data Source
AI summary
A driving mode setting part sets a driving mode when a vehicle travels by automatic driving. An item setting part sets a prioritized diagnosis. A storage part stores plural diagnosis conditions provided in correspondence to each diagnosis item. A target setting part sets a control target value. A motive power source part controls a motive power source based on the control target value. Each diagnosis item is assigned to the driving mode, for which the diagnosis condition is most easily satisfied. The item setting part sets, as a prioritized item, the diagnosis item assigned to the set driving mode. When the prioritized item is set, the target setting part sets the control target value so that the motive power source attains a state, which is close to the diagnosis condition of the prioritized item.