Vehicle Driving Control Device Autonomous Deceleration
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Solution Overview
Problem
In vehicles equipped with driving support control systems, abnormal conditions such as driver impairment can lead to cancellation of deceleration control, resulting in inability to decelerate without driver intervention, posing safety risks.
Innovation Solution
A driving control device with an electronic control unit that calculates and applies a predetermined deceleration value to the vehicle's brakes, independent of driver input, to maintain control and safety when normal driving support control is compromised due to factors like sensor abnormalities or driver impairment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving support control is canceled when abnormality occurs in detection device or signal transmission path, then control reliability is improved, but deceleration control capability is lost when driver is in abnormal state
Solution Approach 1:
The electronic control unit acts as an intermediary that monitors both driving support control status and driver state simultaneously. When driving support control is canceled due to abnormality, the ECU detects driver abnormality through the detection device and autonomously executes deceleration control, mediating between system failure and safety requirement.
Solution Approach 2:
The system performs self-diagnosis and self-correction by monitoring its own components (detection device, signal transmission path) and automatically switching to alternative control modes when abnormalities are detected, without requiring external intervention.
2Productivity
If driving support control continues to be executed even when driver shows abnormality, then vehicle traveling can continue, but safety risk increases when driving support control fails
Solution Approach 1:
The system continuously monitors driver state through the detection device and uses this feedback to dynamically adjust control strategy. When driver abnormality is detected, the system switches from relying on driver input to autonomous deceleration control, creating a closed-loop safety mechanism.
Solution Approach 2:
The system prepares alternative control modes in advance by monitoring both driving support control status and driver state simultaneously. When driving support control is canceled, the pre-prepared autonomous deceleration control activates immediately, cushioning against the safety risk before it can manifest.
3Device complexity
If deceleration control relies on driver braking operation, then system complexity is reduced, but control capability is lost when driver cannot perform normal driving
Solution Approach 1:
The electronic control unit performs multiple functions: it manages driving support control, monitors detection device status, detects driver state, and executes autonomous deceleration control. This multi-functionality eliminates the need for separate systems while maintaining comprehensive control capability.
Data Source
AI summary
A driving control device of a vehicle includes a brake device and an ECU. The brake device is configured to apply a braking force to wheels. The ECU is configured to perform driving support control by calculating target deceleration of the vehicle and controlling the brake device such that deceleration of the vehicle reaches the target deceleration, to stop the driving support control when the driving support control is unable to be performed normally, and to determine whether or not a driver is in an abnormal state. The ECU is configured to decelerate the vehicle by controlling the deceleration of the vehicle so as to reach a predetermined value or more, when the driving support control is unable to be performed normally due to factors other than abnormality of the braking device in a situation where a determination that the driver is in an abnormal state is made.