Adaptive Cruise Control Longitudinal Dynamics Adjustment
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Solution Overview
Problem
Existing adaptive cruise control systems do not allow drivers to easily select a driving style that matches their preferences, as the speed control is limited to constant distance or speed modes without dynamic adjustment based on the driver's desired time gap setting.
Innovation Solution
A method and device that adjust the longitudinal dynamics of a motor vehicle's speed control based on the selected time gap, allowing drivers to choose between sporty and comfortable driving styles by altering the vehicle's acceleration and deceleration capabilities and activation distances of deceleration devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the speed control functions in terms of constant distance control with a fixed time gap, then the distance to the preceding vehicle is maintained, but the driver cannot select a driving style that matches their preferences
Solution Approach 1:
The system dynamically adjusts acceleration and deceleration rates based on the selected time gap. When a driver selects a shorter time gap for sporty driving, the system increases acceleration and deceleration rates. When a longer time gap is selected for comfortable driving, the system reduces these rates. This dynamic adjustment allows the same hardware system to adapt to different driving styles without adding physical complexity.
Solution Approach 2:
The invention changes the control parameters (acceleration rate, deceleration rate, and deceleration activation distance) based on the selected time gap setting. By varying these parameters according to the driver's preference, the system provides different driving styles using the same underlying control architecture, thereby improving adaptability without proportionally increasing device complexity.
2Speed
If a shorter time gap is selected for sporty driving, then the vehicle can accelerate and decelerate more quickly, but the deceleration devices are activated at a shorter distance from the preceding vehicle
Solution Approach 1:
The system dynamically adjusts the deceleration activation distance based on the selected time gap and current vehicle speed. For sporty driving with shorter time gaps, the activation distance is reduced proportionally, allowing quicker response while maintaining a dynamic safety margin. This dynamic adjustment enables the system to achieve faster acceleration and deceleration rates while adapting the activation distance to maintain appropriate safety levels for the selected driving style.
3Ease of operation
If the speed control system provides dynamic driving behavior with increased acceleration and deceleration, then the driver experience is enhanced, but the control system complexity increases
Solution Approach 1:
The control system uses a single set of actuators and sensors to perform multiple functions: maintaining constant distance, enabling sporty driving with rapid acceleration/deceleration, and providing comfortable driving with gradual changes. By making the existing components multi-functional through software-based parameter adjustment, the system achieves enhanced driver experience without proportionally increasing hardware complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables drivers to select a preferred driving style by changing the time gap, resulting in increased acceleration and deceleration capabilities and more dynamic driving behavior, enhancing the adaptability and transparency of the speed control system.
Implementation Method 1
An adaptive speed control that emits a radar beam and detects a preceding vehicle based on the reflected and received partial waves
Data Source
AI summary
A method and a device for controlling the speed of a motor vehicle in terms of a constant distance control in the case that at least one preceding vehicle was detected by a radar sensor or in terms of constant speed control in the case that no preceding vehicle was detected by a radar sensor, the distance to the preceding vehicle being able to be set by the driver in the form of a time gap, wherein the longitudinal dynamics of the speed control may be changed when the time gap changes.