Vehicle Speed Setpoint Coordination for Driver Assistance Control
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Solution Overview
Problem
Existing driver assistance systems for motor vehicles have complex and inconsistent speed management, leading to increased development costs, unclear management for drivers, and potential safety hazards due to changes in speed settings without driver notice.
Innovation Solution
A unified device for assisting in driving, featuring a computer memory with distinct software blocks for powertrain control, display management, and speed instruction determination, allowing for a single valid speed setpoint to be communicated across different functions, simplifying driver interaction and system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each speed regulation/limitation function is implemented as a separate software application with its own speed setpoint management, then each application can independently control its function, but the system complexity and development cost increase significantly
Solution Approach 1:
The system is segmented into distinct functional modules: a central speed setpoint management unit that handles all speed setpoint determination and validation, and separate speed regulation/limitation function modules that execute specific functions. This segmentation allows independent function control while centralizing complex management tasks to reduce overall system complexity.
Solution Approach 2:
A universal speed setpoint management unit is created that serves all speed regulation and limitation functions. This single unit handles speed setpoint determination, validation, and distribution to multiple functions, eliminating the need for each function to have its own independent speed management logic and thereby reducing development complexity and costs.
2Adaptability or versatility
If each software application determines its own speed setpoint independently, then each application has full control over its function, but the speed management becomes unclear for the driver
Solution Approach 1:
A central speed setpoint management unit acts as an intermediary between the driver and multiple speed regulation/limitation functions. This mediator receives speed setpoint inputs, validates them against current system state, and distributes approved setpoints to relevant functions. This ensures consistent, clear speed management that is understandable to the driver while maintaining application autonomy through standardized interfaces.
3Adaptability or versatility
If different applications display speed instructions in different forms, then each application can optimize its display for its specific function, but the driver faces increased complexity in interpreting speed instructions
Solution Approach 1:
A universal speed instruction display format is implemented that can be adapted to different functions. The central speed setpoint management unit provides a standardized speed instruction that all applications can use, ensuring consistency for the driver. Each application can still optimize the presentation within this standardized framework to suit its specific function while maintaining overall display consistency.
4Adaptability or versatility
If the system allows switching between different speed regulation and limitation functions, then the system is versatile and adaptable, but the speed setting may change without driver notice or requirement
Solution Approach 1:
The central speed setpoint management unit implements feedback mechanisms that monitor speed setpoint changes and notify the driver. When switching between functions, the system checks if the speed setpoint should change and only applies changes that are appropriate, ensuring stability and preventing unauthorized or unnoticed speed setting changes while maintaining versatile function switching.
5Adaptability or versatility
If multiple software applications run in different calculators, then the system can be distributed across multiple processing units, but latencies and synchronization problems arise causing display instabilities
Solution Approach 1:
The critical speed setpoint management functionality is merged into a single centralized processing unit that all speed regulation and limitation functions access. This eliminates synchronization problems and display instabilities caused by distributed processing of speed setpoints, while still allowing functions to be implemented across multiple calculators for other purposes. The centralized management ensures consistent, real-time speed instruction delivery to all functions and the display.
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a device (1) for assisting in driving a motor vehicle comprising a powertrain, comprising: - at least two distinct first software blocks (IA, 1B) adapted to transmitting instructions for controlling the powertrain to ensure different speed regulation and/or limitation functions of the motor vehicle, - a second software block (2) adapted to control the display of information on a screen of the motor vehicle, and - a third software block (3) adapted to determine a speed instruction (Vcons) and to deliver said speed instruction to each first software block and to the second software block.