Adaptive Cruise Control Speed Range Switching for Energy Efficiency
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Solution Overview
Problem
Existing vehicle driving systems face challenges in maintaining high energy efficiency during constant-speed control, as they often operate within narrow vehicle-speed ranges, limiting the flexibility in controlling the drive unit to optimize energy usage.
Innovation Solution
A vehicle driving assistance system that switches between first and second constant-speed control modes based on vehicle-speed ranges, allowing wider variations in the second mode to enhance energy efficiency, and incorporates detection units to adjust acceleration and deceleration controls based on the presence and distance of forward and following vehicles to prevent extreme distance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle-speed range is kept narrow to maintain precise speed control, then the vehicle speed can be kept close to the set speed, but the energy efficiency of the drive unit cannot be optimized
Solution Approach 1:
The system dynamically switches between two constant-speed control modes (first and second constant-speed control) based on the traveling state. The first mode maintains narrow speed range for precision when needed, while the second mode allows wider speed range for energy optimization. This dynamic adaptation resolves the contradiction by making the control strategy flexible rather than fixed.
Solution Approach 2:
The system changes the vehicle-speed range parameter between two distinct modes. In the first constant-speed control, a narrow vehicle-speed range is used for precise control. In the second constant-speed control, a wider vehicle-speed range is permitted to optimize drive unit energy efficiency. This parameter change allows the system to balance precision and energy efficiency based on conditions.
2Use of energy by moving object
If the vehicle-speed range is widened to improve energy efficiency, then more drive unit control options become available, but the vehicle speed may deviate more from the set speed
Solution Approach 1:
The system dynamically selects between first constant-speed control (narrow range, high precision) and second constant-speed control (wide range, high efficiency) based on traveling state. This dynamic selection allows the system to achieve energy efficiency when conditions permit, while maintaining precision control when needed, thus resolving the trade-off between efficiency and precision.
Solution Approach 2:
The constant-speed control is segmented into two distinct modes: first constant-speed control with narrow vehicle-speed range for precision, and second constant-speed control with wide vehicle-speed range for energy efficiency. By segmenting the control strategy, the system can apply the appropriate mode for each situation, balancing precision and energy efficiency requirements.
3Measurement precision
If constant-speed control is performed with narrow vehicle-speed range, then precise speed maintenance is achieved, but the degree of freedom for drive unit control is limited
Solution Approach 1:
The system dynamically switches between first constant-speed control (narrow range, limited flexibility) and second constant-speed control (wide range, high flexibility) based on traveling state. This dynamic adaptation allows the drive unit control flexibility to expand when conditions allow, while maintaining precision when required, resolving the contradiction between precision and adaptability.
Solution Approach 2:
The control system is segmented into first constant-speed control mode with narrow vehicle-speed range for precision, and second constant-speed control mode with wide vehicle-speed range for flexibility. This segmentation enables the system to achieve both precise control and adaptable drive unit control depending on which mode is active.
4Use of energy by moving object
If wider vehicle-speed range is allowed for energy efficiency, then drive unit control flexibility increases, but unsafe proximity to other vehicles may occur
Solution Approach 1:
The system uses feedback from detection units that monitor forward and following vehicles to determine when to switch between first and second constant-speed control modes. When vehicles are detected in proximity, the system switches to first control mode (narrow range) to maintain safe distances. When no vehicles are nearby, it switches to second control mode (wide range) for energy efficiency. This feedback mechanism resolves the contradiction between efficiency and safety.
Solution Approach 2:
The system preemptively switches to first constant-speed control (narrow vehicle-speed range) when vehicles are detected in the vicinity, before unsafe proximity occurs. This preliminary action prevents potential safety issues by maintaining tighter speed control when other vehicles are present, while allowing wider control when the environment is safe.
Data Source
AI summary
A vehicle driving assistance system performs traveling assistance control under which an own vehicle automatically travels with. The traveling assistance control includes first constant-speed control for automatically controlling the acceleration of the own vehicle, based on a first vehicle-speed range including a set vehicle speed, such that the vehicle speed of the own vehicle is kept equal to the set vehicle speed, and second constant-speed control for automatically controlling the acceleration of the own vehicle, based on a second vehicle-speed range including the set vehicle speed, such that the vehicle speed of the own vehicle is kept equal to the set vehicle speed. The second vehicle-speed range is set to a wider range than the first vehicle-speed range. The vehicle driving assistance system switches the traveling assistance control between the first constant-speed control and the second constant-speed control, according to the traveling state of the own vehicle.