Vehicle ECU Abnormal Shift Position Control
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Solution Overview
Problem
Vehicles equipped with multiple CPUs for shift sensor output cannot travel when the shift position based on user operation is not recognized by any CPU, leading to operational failures.
Innovation Solution
Incorporating an electronic control unit that sets an abnormality-time shift position using vehicle surroundings information, such as current position, map information, and space information, to control the drive device, allowing the vehicle to travel safely and stably even when the shift position is not recognized, by setting appropriate shift positions and controlling speed and braking accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CPUs are used to recognize shift sensor output, then reliability is improved through redundancy, but the vehicle cannot travel when the shift position is not recognized by any CPU
Solution Approach 1:
The electronic control unit performs preliminary actions by detecting abnormalities in shift position recognition before complete system failure occurs. When a CPU fails to recognize the shift position, the system proactively switches to abnormality-time shift position based on vehicle surroundings information, preventing total loss of travel capability
Solution Approach 2:
The electronic control unit acts as an intermediary between the failed CPU recognition system and the drive device. It introduces a new control mechanism using vehicle surroundings information (map information, current position, surrounding space) as a mediator to determine appropriate shift positions when normal CPU recognition fails
2Reliability
If the vehicle stops when shift position cannot be recognized, then safety is maintained, but productivity is reduced due to inability to travel
Solution Approach 1:
The system dynamically adjusts its operation mode based on the recognition status. When shift position is properly recognized, normal driving is allowed. When recognition fails, the system dynamically switches to abnormality-time shift position control based on vehicle surroundings, enabling continued travel under changed conditions while maintaining safety
Solution Approach 2:
The electronic control unit changes the control parameters by switching from normal shift position control to abnormality-time shift position control. It uses vehicle surroundings information (map information, current position, surrounding space) as new parameters to determine appropriate shift positions, enabling travel continuation under abnormal conditions
Data Source
AI summary
An electronic control unit of a vehicle recognizes a shift position based on a user's shift operation and controls a drive device based on the shift position, and an accelerator operation, a brake operation, and a steering operation by the user. When a predetermined abnormality that the shift position is not able to be recognized has occurred, the electronic control unit sets an abnormality-time shift position based on vehicle surroundings information and controls the drive device based on the abnormality-time shift position, the brake operation, and the steering operation.