Vehicle Longitudinal Control for Cross-Traffic Collision Braking
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Solution Overview
Problem
Existing automatic emergency brake systems for motor vehicles often result in strong, uncomfortable braking interventions, especially when driving straight, which can be unnecessary and uncomfortable for passengers.
Innovation Solution
A procedure for at least partially automatic longitudinal control of a motor vehicle that determines if another road user is crossing its path and calculates a target speed to avoid a predicted collision, reducing the strength of the intervention by slowing the vehicle down earlier and more gradually.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic emergency braking systems intervene late to avoid unnecessary braking, then false interventions are reduced, but passenger comfort deteriorates due to strong delayed braking forces
Solution Approach 1:
The system performs preliminary analysis of the road user's movement trajectory and speed vector to predict potential collisions before they occur. By calculating whether the road user is moving substantially transversely to the vehicle's direction of movement, the system intervenes early with gradual speed reduction rather than late emergency braking, thus avoiding strong braking forces on passengers while still preventing collisions
2Reliability
If strong emergency braking is applied to prevent collision, then collision avoidance is achieved, but passenger comfort deteriorates due to high braking forces and subsequent acceleration requirements
Solution Approach 1:
The system changes the braking parameter from strong emergency braking to gradual speed reduction. By determining that the road user is moving substantially transversely and calculating an appropriate target speed, the system applies gentle braking forces that gradually reduce speed to the target value, avoiding the high forces and subsequent acceleration cycles associated with emergency braking while still achieving collision avoidance
3Object-affected harmful factors
If the vehicle speed is reduced early and gradually to a calculated target speed, then passenger comfort is improved, but the complexity of the control system increases due to speed vector analysis and target speed calculation
Solution Approach 1:
The computing unit performs preliminary analysis of the road user's speed vector and movement trajectory to determine if they are moving substantially transversely to the vehicle's direction of movement. This preliminary analysis enables early intervention with gradual speed reduction to a calculated target speed, improving passenger comfort while the automated computation handles the complexity of the analysis
4Object-affected harmful factors
If the system calculates a target speed based on transverse movement detection, then unnecessary strong braking is avoided, but the time required for speed analysis and target calculation increases
Solution Approach 1:
The system performs preliminary detection and analysis of the road user's speed vector and movement trajectory as soon as the road user is detected. By continuously monitoring and pre-calculating the transverse movement condition, the system can quickly determine whether gradual speed reduction to a target speed is appropriate, avoiding unnecessary strong braking while minimizing the time required for analysis through continuous pre-processing of speed data
Data Source
AI summary
The invention relates to a method for an at least partly automatic longitudinal control of a motor vehicle (1). Sensor data is generated by means of a surroundings sensor system (10), said sensor data representing the surroundings. A speed vector (8) of a traffic participant (2) in the surroundings is determined by means of a computing unit (4) on the basis of the sensor data, and a potential collision of the traffic participant (2) with the motor vehicle (1) is predicted. On the basis of the speed vector (8), it is ascertained that the traffic participant (2) is moving substantially transversely to the movement direction (7) of the motor vehicle, and a target speed is calculated for the motor vehicle (1) in order to prevent the predicted collision. The speed of the motor vehicle (1) is automatically reduced to the target speed.