Vehicle Coasting Control via Predictive Path Profiles
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Solution Overview
Problem
Current vehicle cruise control systems are inflexible and do not account for varying road conditions, such as slower-moving vehicles ahead, and fail to improve fuel efficiency.
Innovation Solution
A method and system for generating coasting profiles based on predicted vehicle paths, allowing the vehicle to adjust speed and enter a coasting mode to maintain a target speed range, which includes features like regenerative braking and engine modulation to optimize fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant speed cruise control is used to maintain a fixed speed, then speed stability is improved, but flexibility to adapt to road conditions and fuel efficiency deteriorate
Solution Approach 1:
The system dynamically adjusts the vehicle speed by generating multiple coasting profiles with different initial speeds and starting points, allowing the vehicle to adapt to varying road conditions while maintaining speed stability through predictive control
Solution Approach 2:
The system changes speed parameters by selecting from multiple coasting profiles with different initial speeds and starting points, enabling the vehicle to adapt to different road conditions and optimize fuel efficiency
2Use of energy by moving object
If the vehicle enters coasting mode to improve fuel efficiency, then fuel consumption is reduced, but speed control precision deteriorates
Solution Approach 1:
The system performs preliminary actions by generating multiple coasting profiles in advance and selecting the most appropriate one before entering coasting mode, ensuring both fuel efficiency and speed control precision are maintained
Solution Approach 2:
The system uses feedback from vehicle sensors and predicted path information to continuously monitor actual speed and adjust coasting profile selection, maintaining speed control precision while improving fuel efficiency
3Adaptability or versatility
If multiple coasting profiles are generated with different initial speeds and starting points, then adaptability to different road conditions is improved, but system complexity increases
Solution Approach 1:
The system segments the coasting control into multiple discrete profiles with different initial speeds and starting points, making the complex adaptive control problem manageable while maintaining high adaptability to road conditions
Data Source
AI summary
Method and apparatus for maintaining a speed of a vehicle within a target speed range. A plurality of coasting profiles are generated for the vehicle, each having an initial speed and a starting point on a predicted vehicle path. Each coasting profile represents a predicted vehicle speed over a time and/or distance from the starting point and is generated based on a geometry of at least a portion of the predicted vehicle path. At least one of the coasting profiles that maintains the speed of the vehicle within the target speed range is identified. A prime mover of the vehicle is controlled to place the vehicle into a coasting mode in accordance with the at least one identified coasting profile. Alternatively, feedback is provided to a user to place the vehicle into a coasting mode, such that the vehicle will coast in accordance with the at least one identified coasting profile.