Vehicle Electronic Control Device for Adaptive Speed Limiting
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Solution Overview
Problem
Vehicle electronic control devices for autonomous driving face challenges in managing battery power consumption during deceleration, leading to increased costs due to the need for large-capacity batteries to handle varying deceleration periods based on vehicle speed, which is inefficient and costly.
Innovation Solution
A vehicle electronic control device that detects the state of an occupant and adjusts the maximum allowable speed and time for autonomous driving, allowing the use of a smaller battery capacity by optimizing deceleration to conserve energy and reduce costs, using a first and second control device powered by separate batteries, with the second device taking over when the first fails, ensuring safe and efficient stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large-capacity battery is used to ensure sufficient power for the second controller during deceleration, then the vehicle can handle high-speed scenarios with long deceleration periods, but the parts cost increases
Solution Approach 1:
The patent dynamically adjusts the maximum allowable speed based on real-time conditions (occupant state, battery charge level, deceleration requirements) rather than using a fixed speed limit. This allows the system to optimize power consumption during deceleration while ensuring safe stopping, thereby reducing the required battery capacity without compromising safety
Solution Approach 2:
The system changes multiple parameters simultaneously: maximum allowable speed is adjusted based on battery charge level, occupant state, and deceleration requirements. By dynamically modifying these parameters, the system ensures that the second controller can complete deceleration within available power, eliminating the need for oversized batteries
2Ease of manufacture
If the maximum allowable speed is reduced to ensure the vehicle can stop within the battery duration, then the battery capacity can be smaller, but the vehicle performance and stopping capability are compromised
Solution Approach 1:
The maximum allowable speed is not a fixed value but is dynamically determined based on battery charge level, occupant state, and required deceleration distance. This dynamic adjustment allows the system to maximize speed when conditions permit while ensuring safe stopping is always achievable, thus maintaining performance while enabling smaller battery capacity
Solution Approach 2:
The system pre-calculates the relationship between occupant state and response time, and pre-determines appropriate maximum allowable speeds for different battery charge levels. This preliminary preparation allows the system to quickly adjust speed limits without compromising real-time stopping capability, balancing performance and battery size requirements
3Use of energy by moving object
If the vehicle speed is high when the second controller starts controlling, then the deceleration period is long and power consumption is large, but reducing speed limits the vehicle's operational efficiency
Solution Approach 1:
The system adjusts multiple parameters during deceleration: maximum allowable speed is reduced based on battery charge level, and the system monitors whether the predicted power consumption exceeds available battery power. If it does, the speed limit is further reduced until a safe deceleration profile is established, optimizing both energy efficiency and operational effectiveness
Data Source
AI summary
A vehicle electronic control device includes a detection device configured to detect a state of an occupant, a first control device, and a second control device. The second control device is configured to refer to a database defining a relationship between the state of the occupant and a first time and to autonomously drive the vehicle at speeds equal to or lower than the maximum allowable speed from a switching time that is the time at which the first control device becomes unable to control the vehicle. The database is set in such a manner that the maximum allowable speed corresponding to a second state of the occupant is lower than the maximum allowable speed corresponding to a first state of the occupant when the first time corresponding to the second state is longer than the first time corresponding to the first state.