Vehicle Deceleration Control With Brake Threshold Handover
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Solution Overview
Problem
Existing vehicle control systems stop automatic driving when a driver intervenes, even if the driver does not want to end automatic driving, leading to decreased convenience for drivers who wish to continue using the feature.
Innovation Solution
A control device and method that calculates a first deceleration amount for automatic driving and a second deceleration amount based on the driver's brake pedal operation, using the greater value for control when the second deceleration amount is within a threshold, and stopping automatic driving when it exceeds the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic driving control is stopped when the driver operates the brake pedal, then the driver can perform crisis avoidance operations, but the automatic driving convenience is reduced when the driver does not desire to stop automatic driving
Solution Approach 1:
The system changes the parameter of automatic driving control status based on the magnitude of brake pedal operation. When brake operation is within the threshold range, the system maintains automatic driving mode while adjusting deceleration. When brake operation exceeds the threshold, the system transitions to manual driving mode. This parameter-based transition resolves the contradiction by allowing both crisis avoidance (through threshold-based manual takeover) and convenience (through continued automatic driving for minor brake inputs).
Solution Approach 2:
The system dynamically adjusts the automatic driving control state based on real-time brake pedal operation magnitude. Rather than a static stop-or-continue approach, the system continuously monitors brake input and dynamically switches between maintaining automatic driving and transitioning to manual control, optimizing both safety and convenience based on current driving conditions.
2Reliability
If the driver's brake operation always overrides automatic driving deceleration, then crisis avoidance is prioritized, but normal automatic driving functionality is degraded
Solution Approach 1:
The system uses the threshold value as a parameter boundary to distinguish between normal braking (within threshold) and crisis avoidance braking (exceeding threshold). For normal braking, the system merges deceleration requests to maintain automatic driving efficiency. For crisis avoidance, the system prioritizes driver input. This parameter-based differentiation resolves the contradiction between prioritizing safety and maintaining productivity.
Solution Approach 2:
The system applies partial override of automatic driving only when necessary (when brake operation exceeds threshold), rather than complete override in all cases. This partial action approach maintains automatic driving functionality for normal operations while enabling full driver control when needed, thus preserving productivity while ensuring safety when required.
Data Source
AI summary
A processor of an ECU includes: a deceleration amount calculation unit that calculates a first deceleration amount for controlling deceleration of a vehicle during vehicle driving in an automatic driving mode; a deceleration amount acquisition unit that acquires a second deceleration amount of the vehicle according to an operation of a brake pedal when a driver operates the brake pedal; a deceleration control unit that controls deceleration of the vehicle by using a greater value of the first deceleration amount and the second deceleration amount when the second deceleration amount is equal to or less than a predetermined threshold value during vehicle driving in the automatic driving mode; and a stopping unit that stops the automatic driving mode when the second deceleration amount exceeds the predetermined threshold value.