Vehicle Speed Control Apparatus for Adaptive Deceleration
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Solution Overview
Problem
Existing vehicle speed control systems, such as smart cruise control, fail to precisely control vehicle speed at speed limit points, leading to premature deceleration and degradation of ride comfort due to lack of consideration for current vehicle acceleration and driving characteristics.
Innovation Solution
A vehicle speed control apparatus that recognizes speed limit points using GPS and navigation, selects appropriate deceleration characteristic values based on location and speed limit, and calculates targeted acceleration to optimize vehicle speed control, minimizing deceleration impact and ensuring comfortable ride by reflecting driving characteristics like maximum allowable acceleration and jerk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If brake control is immediately performed upon sensing a speed limit, then the vehicle speed is controlled to meet the speed limit, but the deceleration occurs at a point far away from the speed limit point which degrades the overall driving speed
Solution Approach 1:
The system performs preliminary calculation of the required deceleration distance based on current vehicle speed and selects appropriate deceleration characteristic values before actual deceleration begins. This allows the vehicle to start decelerating at the optimal point, ensuring it reaches the speed limit point at the correct speed without excessive early deceleration that would reduce overall driving speed.
2Measurement precision
If brake control is immediately performed upon sensing a speed limit, then the vehicle speed is controlled to meet the speed limit, but the deceleration occurs abruptly which degrades comfortable ride
Solution Approach 1:
The system dynamically selects deceleration characteristic values from multiple stored sets based on the calculated deceleration distance and current driving conditions. This dynamic selection allows the deceleration profile to adapt to different situations, ensuring smooth and comfortable deceleration by choosing characteristic values that provide gradual speed reduction rather than abrupt braking.
Solution Approach 2:
The system changes deceleration parameters (characteristic values) based on the selected deceleration distance. By adjusting these parameters according to the specific situation, the system optimizes the deceleration profile to balance speed control precision with ride comfort, avoiding both premature and abrupt deceleration.
3Device complexity
If deceleration control is performed without considering current vehicle acceleration and driving characteristics, then the control system is simple, but it is difficult to precisely control optimal vehicle speed at appropriate speed within required distance
Solution Approach 1:
The system uses parameter changes by selecting from pre-stored deceleration characteristic value sets that correspond to different driving conditions. This approach maintains relatively simple system architecture while achieving precise speed control, as the complex deceleration profiles are pre-calculated and stored, requiring only selection and application during operation.
Data Source
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AI summary
Disclosed is a vehicle speed control apparatus including: a speed limit information recognition unit recognizing a location and a speed limit of a speed limit point located in front of a vehicle; a storage unit stored with deceleration characteristic values including at least one driving characteristic; a deceleration characteristic select unit selecting the deceleration characteristic values corresponding to the location and the speed limit of the recognized speed limit point among the deceleration characteristic values stored in the storage unit; and a targeted acceleration calculation unit calculating a targeted acceleration necessary for a vehicle speed control up to the speed limit point based on the selected deceleration characteristic values. By this configuration, it is possible to precisely control the vehicle speed up to the speed limit point at an optimal speed.