Vehicle Speed Limit Adjustment for Emergency Acceleration
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Solution Overview
Problem
Range anxiety is a significant issue for new energy vehicles, particularly when the battery level is low or the range is insufficient, leading to high energy consumption and reduced user experience due to fixed speed limit values.
Innovation Solution
A method and apparatus for dynamically adjusting the speed limit value of a vehicle based on the accelerator pedal opening and/or its change rate, allowing the vehicle to increase the speed limit when the user intends emergency acceleration, thereby improving safety and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the speed limit value is fixed to reduce energy consumption, then energy efficiency is improved, but vehicle safety and emergency response capability deteriorate
Solution Approach 1:
The patent applies dynamics by transforming the fixed speed limit into a dynamic adjustable parameter. The speed limit value changes based on driving conditions, accelerator pedal opening, and energy state, allowing the system to adapt between energy-saving mode (lower speed limit) and emergency mode (higher speed limit), thus resolving the contradiction between energy efficiency and safety
Solution Approach 2:
The patent changes the speed limit parameter from a fixed value to a variable that can be adjusted between a first speed limit value (lower, for energy saving) and a second speed limit value (higher, for emergency situations). This parameter change enables the system to optimize energy consumption during normal driving while ensuring safety capability during emergencies
2Reliability
If the speed limit value is increased to improve safety and emergency response, then vehicle safety is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the speed limit based on real-time conditions. During normal driving, the lower first speed limit value reduces energy consumption. When emergency conditions are detected (through accelerator pedal opening or change rate), the system switches to the higher second speed limit value, ensuring safety only when needed
Solution Approach 2:
The system periodically monitors driving conditions and adjusts the speed limit value accordingly. The speed limit oscillates between two values based on the driving state, applying energy-saving constraints during stable conditions and relaxing them during emergency situations, thus balancing energy consumption and safety
3Device complexity
If the speed limit value is fixed to simplify control, then device complexity is reduced, but adaptability to different driving scenarios deteriorates
Solution Approach 1:
The patent implements a dynamic speed limit system that adapts to different driving scenarios (ECO mode, normal mode, emergency mode) by adjusting the speed limit value. This dynamic adaptation enhances versatility without requiring complex hardware modifications, as the adjustment is achieved through control logic based on simple sensor inputs
Data Source
AI summary
A speed limit value adjustment method includes obtaining an accelerator pedal opening and/or an accelerator pedal opening change rate of a vehicle running in a first mode, where a speed limit value of the vehicle in the first mode is a first speed limit value; and adjusting the speed limit value of the vehicle to a second speed limit value when it is detected that the accelerator pedal opening and/or the accelerator pedal opening change rate meet/meets a preset condition. The second speed limit value is greater than the first speed limit value.