Vehicle Motion Manager for Collision-Triggered Stop Braking
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Solution Overview
Problem
Existing vehicle motion managers do not address how to enhance braking force when a stopped vehicle is about to collide with another object, as they primarily focus on acceleration and deceleration during travel.
Innovation Solution
A motion manager and control device that generates an instruction value for the brake device to apply a greater braking force than usual when a potential collision is detected, even when the vehicle is stopped, using type information and restriction data to ensure the braking force does not exceed the brake device's limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake device generates constant braking force when the vehicle is stopped, then the vehicle can be held stationary with sufficient braking force, but the braking force may not be sufficient to prevent vehicle movement due to collision impact
Solution Approach 1:
The braking force is made dynamic rather than constant. The motion manager adjusts the braking force level based on the vehicle's motion state (moving vs. stopped) and collision risk assessment. When the vehicle is stopped and collision is detected, the system increases the braking force from the constant level to a higher level to prevent movement due to impact.
Solution Approach 2:
The braking force parameter is changed based on the motion request and collision detection. The motion manager receives motion requests that indicate additional braking force is needed, and it generates instruction values that increase the braking force parameter from the constant stopped level to a higher level sufficient to prevent collision-induced movement.
2Reliability
If the brake device generates greater braking force to prevent vehicle movement during collision, then collision prevention effectiveness is improved, but the brake device may be subjected to excessive force beyond its limits
Solution Approach 1:
The system uses feedback from motion requests generated by the application (which determines collision risk) to adjust the braking force. The motion manager receives feedback about the need for additional braking force and adjusts the instruction value accordingly, while the brake control unit ensures the force remains within the brake device's capabilities.
Solution Approach 2:
The motion manager acts as an intermediary between the collision detection application and the brake control unit. It processes the motion request, determines the appropriate instruction value, and translates the collision prevention need into a safe braking force command that the brake device can execute without exceeding its force limits.
3Reliability
If the motion manager generates instruction values for increased braking force based on motion requests, then collision prevention capability is improved, but the system complexity increases
Solution Approach 1:
The motion manager is designed to handle multiple functions: it manages normal braking operations during vehicle movement and also handles collision prevention when the vehicle is stopped. By making the motion manager universal, the patent avoids adding separate dedicated collision prevention hardware, thus managing complexity while improving capability.
Solution Approach 2:
The system performs preliminary assessment of collision risk through the application's motion request before actual collision occurs. The motion manager prepares the appropriate braking instruction in advance based on the motion request, allowing the brake device to be ready to prevent collision-induced movement without requiring complex real-time reaction systems.
Data Source
AI summary
A motion manager mounted on a vehicle includes a processor. The processor receives, from an application that has determined that another object will collide with the vehicle, a motion request indicating that an additional braking force is needed, when the vehicle is stopped. The processor generates an instruction value for causing a brake device to generate a greater braking force than before the motion request is received, when the motion request indicating that the additional braking force is needed is received.