Low-Speed Driver Assistance System for Automatic Braking
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Solution Overview
Problem
Conventional driver assistance systems in motor vehicles are complex and unsuitable for simple control tasks that require complete driver participation, as they rely on environmental sensors and are not effective below a certain speed threshold.
Innovation Solution
A driver assistance system that can be activated below a predefined limit speed (e.g., 40 km/h) to automatically brake the vehicle without environmental sensor input, allowing the driver to initiate automatic deceleration by releasing the accelerator pedal, with customizable deceleration characteristics and prioritization of driver input via the brake pedal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ACC systems with complex sensor technology are used, then the system can survey surroundings and adapt to complex control tasks, but the system becomes too complex and unsuitable for simple control tasks requiring complete driver participation
Solution Approach 1:
The driver assistance system is segmented into two distinct operational modes: a first control mode for low-speed operation (0-40 km/h) without sensor input, and a second control mode for higher speeds with sensor-based environmental survey. This segmentation allows the system to be simple when needed while maintaining adaptability when required
Solution Approach 2:
The system dynamically switches between different operational modes based on vehicle speed and driver input. The control device transitions between the first control mode (simple, no sensor input) and second control mode (complex, sensor-based) as needed, making the system adaptable to different operational requirements
2Ease of operation
If the driver assistance system operates without environmental sensor input below limit speed, then the system structure is simplified and ease of operation is improved, but the system can only function in low-speed scenarios
Solution Approach 1:
The system applies different operational characteristics to different speed ranges: below the limit speed (e.g., 40 km/h), the system operates in a simplified mode without environmental sensor input, while above this speed, sensor-based control takes over. This local differentiation optimizes ease of operation in low-speed scenarios while maintaining versatility across the full speed range
3Ease of operation
If the driver must provide activation signal to initiate automatic deceleration, then the driver maintains complete participation and control, but the response time required from the driver increases
Solution Approach 1:
The system is pre-configured with deceleration characteristics and limit speeds by the manufacturer or selectable by the driver. When the driver releases the accelerator pedal, the system immediately executes the predetermined deceleration profile without requiring additional activation signals or processing time, reducing response time while maintaining driver control
Data Source
AI summary
A motor vehicle includes a driver assistance system which is rendered operative when the motor vehicle travels below a limit speed to automatically brake the motor vehicle to a halt while moving forward or backing up. The deceleration characteristic can be predefined or can be selected from an array of deceleration characteristics in dependency on an operating behavior of an accelerator pedal.