Adaptive Cruise Control Dynamics Adjustment for Road Inclines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional adaptive cruise control systems fail to maintain ride comfort and desired spacing from the vehicle ahead during inclines or downhill travel, leading to sudden braking interventions and discomfort, as they are not effectively adaptable to environmental influences like road inclination.
Innovation Solution
A method and device that detect overshoots and undershoots of a limiting value related to the vehicle's wheel brake state within a defined period, using information about the vehicle ahead to adjust control parameters and adapt feedback control to environmental influences, ensuring consistent ride comfort and spacing maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional feedback control systems are used for adaptive cruise control, then ride comfort can be maintained during level travel, but the system fails to maintain comfort and desired spacing during downhill travel due to additional gravitational acceleration
Solution Approach 1:
The control parameter is dynamically adjusted based on detected environmental influences. The system transitions from a static control approach to a dynamic one where the control parameter adapts in real-time to changing conditions such as downhill gradients, thereby maintaining reliable spacing control across varying operational environments
Solution Approach 2:
The system employs feedback control by detecting the number of overshoots and undershoots of the actual spacing relative to the desired spacing. This feedback mechanism allows the system to identify environmental influences and automatically adjust the control parameter to compensate for gravitational effects during downhill travel
2Reliability
If the system increases braking intervention to maintain spacing during downhill travel, then spacing control is improved, but ride comfort deteriorates due to sudden and strong braking
Solution Approach 1:
The system performs preliminary adjustment of the control parameter when environmental influences are detected through overshoot/undershoot patterns. By proactively adjusting the control parameter before severe spacing deviations occur, the system prevents the need for sudden strong braking interventions, thereby maintaining both reliable spacing control and ride comfort
Data Source
AI summary
Automatically controlling the longitudinal dynamics of a vehicle includes ascertaining a state variable dependent on the state of at least one wheel brake, detecting overshoots and/or undershoots of a limiting value of the state variable, ascertaining information about a vehicle traveling ahead, setting at least one control of a feedback control system, and controlling the longitudinal dynamics of the vehicle as a function of the at least one control parameter. A sensing device used to ascertain the state of the at least one wheel brake, another sensing device is used to ascertain information about the vehicle traveling ahead, and an evaluating, setting and controlling unit is used to evaluate the state of the at least one wheel brake and the information about the vehicle traveling ahead for setting the at least one control parameter and for controlling the longitudinal dynamics of the vehicle as a function thereof.