EV Charging Time Estimation via Auxiliary Load Actuation
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Solution Overview
Problem
Existing timer charging systems for electric vehicles fail to accurately estimate the required charging time period due to the influence of auxiliary machine actuation, leading to incomplete charging or prolonged battery degradation.
Innovation Solution
The vehicle incorporates an electronic control unit that creates an actuation schedule for auxiliary loads and learns charging power patterns to accurately estimate the required charging time period, ensuring the battery is fully charged by the scheduled finish time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If timer charging is used to charge the electrical storage device at scheduled times, then charging can be performed efficiently using external power supply, but the charging time period estimation becomes inaccurate when auxiliary machines are actuated
Solution Approach 1:
The patent dynamically adjusts the charging time period estimation based on the actuation state of auxiliary machines. The electronic control unit monitors whether auxiliary machines are actuated during charging and modifies the estimation accordingly, transitioning from a static scheduled estimation to a dynamic adaptive estimation that reflects real-time power consumption conditions.
Solution Approach 2:
The patent changes the parameters used for charging time period estimation based on auxiliary machine actuation. When auxiliary machines are actuated, the system adjusts the estimated charging time by adding a correction value to account for the additional power consumption, thereby adapting the estimation parameters to current operating conditions rather than using fixed scheduled values.
2Device complexity
If the charging time period is estimated using learned values without considering auxiliary machine actuation, then the estimation process is simple, but the estimated charging time period becomes inaccurate when auxiliary machines consume power
Solution Approach 1:
The electronic control unit automatically monitors the actuation state of auxiliary machines and self-adjusts the charging time period estimation without requiring complex external intervention. The system uses its own internal sensors and control logic to detect auxiliary machine operation and autonomously corrects the estimation, maintaining simplicity while improving accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the electronic control unit continuously monitors auxiliary machine actuation during charging and uses this information to correct the charging time period estimation. The system feeds back the auxiliary machine status to the estimation algorithm, creating a closed-loop system that adapts to actual power consumption conditions.
3Ease of operation
If charging is scheduled to finish at a predetermined time, then user convenience is improved, but the battery may not be fully charged if auxiliary machines consume excessive power
Solution Approach 1:
The patent performs preliminary estimation of the charging time period by considering the scheduled actuation of auxiliary machines before charging begins. The electronic control unit calculates the expected power consumption of auxiliary machines during the charging period and pre-adjusts the charging schedule accordingly, ensuring that sufficient time is allocated for charging even when auxiliary machines are actuated.
Data Source
AI summary
A vehicle includes an electrical storage device, an auxiliary load, a charger configured to charge the electrical storage device with power supplied from a power supply outside the vehicle, and an electronic control unit. The electronic control unit is configured to create an actuation schedule of the auxiliary load during charging of the electrical storage device, before initiation of the charging. The electronic control unit is configured to learn charging power of the electrical storage device for each actuation pattern of the auxiliary load during the charging. The electronic control unit is configured to estimate a required time period for the charging based on a learned value of the charging power, an execution time period of each of the actuation patterns, and a total charging power amount of the electrical storage device. The electronic control unit sets initiation time of the charging in accordance with the estimated required time period.