Dynamic Stop-Start Prohibition Period for Vehicle ECU
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Solution Overview
Problem
In vehicles with scene-specific electric power supply control, the stop-and-start control (S&S control) may be prematurely allowed, potentially leading to system abnormalities when transitioning from ignition OFF to ON, especially when specific functions like EPS are still operational, as existing methods do not adequately account for communication disruptions.
Innovation Solution
The electronic control unit sets a longer prohibition period for S&S control after ignition ON in cases where specific functions are operational, ensuring system stability and normal operation by differentiating the prohibition time based on the state of these functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the S&S control prohibition period is set to a fixed initial value after IG-ON, then the control logic is simple, but system abnormality may occur when specific functions are still operational
Solution Approach 1:
The S&S control prohibition period is changed from a fixed value to a dynamic value that varies based on the operational state of specific functions. When specific functions are operational at IG-ON, a longer prohibition period is applied; when they are not operational, a shorter period is used. This dynamic adjustment resolves the contradiction by adapting the prohibition period to actual system conditions rather than using a one-size-fits-all approach.
Solution Approach 2:
The prohibition period parameter is modified based on the state of specific functions. The control device determines whether specific functions are operational at the time of IG-ON and adjusts the prohibition period accordingly. This parameter change approach allows the system to maintain reliability under different operating conditions while managing complexity through a clear decision logic.
2Reliability
If the S&S control prohibition period is extended to cover communication abnormality confirmation time, then system reliability is improved, but fuel consumption increases due to reduced S&S control opportunities
Solution Approach 1:
The prohibition period parameter is adjusted based on the operational state of specific functions. When specific functions are not operational at IG-ON, the prohibition period is set to a shorter duration, allowing S&S control to resume sooner and reduce fuel consumption. When specific functions are operational, the period is extended to ensure reliability. This conditional parameter adjustment resolves the contradiction by optimizing the prohibition period for each specific scenario.
Solution Approach 2:
Instead of always applying the maximum prohibition period needed for communication abnormality confirmation, the system applies only the necessary duration based on actual system state. When specific functions are not operational, a shorter prohibition period is sufficient, avoiding unnecessary fuel consumption while still ensuring system reliability when needed.
3Use of energy by moving object
If S&S control is allowed immediately after IG-ON, then fuel economy is improved, but system abnormality may occur due to communication disruptions
Solution Approach 1:
The system performs a preliminary check of the specific function operational state at the time of IG-ON before allowing S&S control to resume. Based on this preliminary assessment, the appropriate prohibition period is determined and applied. This preliminary action ensures that system reliability is maintained by identifying potential communication disruption risks before S&S control is re-enabled.
Solution Approach 2:
The prohibition period parameter is dynamically changed based on the preliminary assessment of system state. When specific functions are operational at IG-ON, indicating potential communication vulnerability, a longer prohibition period is applied. When they are not operational, a shorter period suffices. This parameter adjustment resolves the contradiction by tailoring the prohibition duration to actual system conditions.
Data Source
AI summary
A control device for a vehicle includes an electronic control unit. The electronic control unit executes control for prohibiting stop-and-start control until a predetermined period elapses after an ignition switch is turned ON. The electronic control unit executes scene-specific electric power supply control for operating a first function group that is a specific function and stopping a function other than the first function group in accordance with a state of the vehicle at a time when the ignition switch is turned OFF. The electronic control unit sets the predetermined period during which the stop-and-start control is prohibited longer in a case where the first function group is in an operating state than in a case where the first function group is not in an operating state when the ignition switch is turned ON.