EV Range Estimation via Dynamic Consumption Smoothing
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Solution Overview
Problem
Existing methods for estimating the allowed travel distance of electric vehicles using electric power from a power storage device are not accurate due to variations in power consumption based on driving habits and changing environmental conditions, such as road state and traffic, which are not adequately reflected in calculations based on previous traveling operations.
Innovation Solution
A vehicle control system that calculates a first electric consumption based on average operating points and a second electric consumption over a predetermined period, using a correction factor to estimate the allowed travel distance, with smoothing processes to stabilize the calculation and reflect driving habits and road conditions, incorporating a rotating electric machine and a control device that generates traction driving force using electric power from a power storage device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the allowed travel distance is calculated based on information from the previous traveling operation of a routine course, then the calculation can be performed using available historical data, but the accuracy of the allowed travel distance estimation deteriorates due to variations in power consumption based on driving habits and environmental conditions
Solution Approach 1:
The patent transitions from using fixed historical data to a dynamic calculation method that continuously updates the allowed travel distance estimation based on real-time operating conditions. The system dynamically adjusts the calculation by incorporating current vehicle speed, acceleration, power storage device state, and environmental factors, making the estimation adaptive to changing driving habits and conditions rather than relying on static previous operation data
Solution Approach 2:
The system implements feedback by continuously monitoring actual power consumption during travel and comparing it with the estimation model. The control device calculates allowed travel distance based on real-time state of charge and actual operating conditions, then uses this information to refine future estimations. This closed-loop feedback mechanism enables the system to adapt to varying driving patterns and environmental conditions, improving accuracy over time
2Device complexity
If the calculation uses fixed historical data from previous operations, then the computational complexity is reduced, but the reliability of the estimation deteriorates when environmental conditions such as road state and traffic differ from previous operations
Solution Approach 1:
The patent changes the parameters used in the calculation from fixed historical values to dynamic parameters that reflect current operating conditions. The control device incorporates real-time variables such as vehicle speed, acceleration, power storage device state of charge, and environmental conditions into the estimation calculation. This parameter transformation allows the system to maintain computational efficiency while significantly improving reliability under varying road states and traffic conditions
Solution Approach 2:
The system performs preliminary calculations by pre-establishing the relationship between operating parameters and power consumption characteristics. The control device is configured to calculate allowed travel distance based on the state of charge and current operating conditions, preparing the estimation framework in advance so that real-time adjustments can be made efficiently without excessive computational burden during actual operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for a more accurate estimation of the remaining travel distance, improving reliability by accounting for user driving habits and environmental factors, ensuring safe notification of the vehicle's range based on the power storage device's remaining capacity.
Implementation Method 1
a rotating electric machine 130 for generating traction driving force using electric power from a power storage device 110
Data Source
AI summary
A vehicle capable of traveling using electric power from a power storage device mounted thereon has an ECU executing, when traveling by electric power from the power storage device: the step of calculating a reference electric consumption based on an average operating point determined by an average vehicle speed and average driving force for every predetermined period; the step of calculating an actual electric consumption based on power consumption and travel distance during the period; the step of calculating a predicted electric consumption by a smoothing processing based on the reference electric consumption and actual electric consumption; and the step of calculating an allowed travel distance RMD that the vehicle can travel by the electric power remaining in the power storage device, based on the predicted electric consumption and the SOC of the power storage device.