EV Charging Rate Control for EVSE Restart Failures
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Solution Overview
Problem
Charging equipment for electric vehicles (EVs) often lacks automatic restart functionalities due to technical malfunctions, leading to energy depletion during idle periods, which affects driving range and causes range anxiety.
Innovation Solution
A computer system with processing circuitry performs a functionality test routine to identify charging restart capabilities in EVSE, determining anomalies, and controls the charging rate to prevent energy loss by implementing a reduced charging rate when restart functionalities are absent or malfunctioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EVSE lacks automatic restart functionalities or experiences technical malfunctions, then the charging system is simpler and more reliable, but energy depletion occurs during idle periods affecting driving range
Solution Approach 1:
The system performs a functionality test routine before the actual charging operation to identify whether the EVSE has charging restart functionality. This preliminary action allows the system to prepare appropriate charging strategies in advance, preventing energy depletion during idle periods by selecting EVSEs with restart capability or adjusting charging parameters accordingly.
Solution Approach 2:
The system continuously monitors the charging state and battery SoC levels, and provides feedback to adjust the charging rate. When the vehicle is connected to an EVSE, the system tests for restart functionality and uses this information to control the charging rate, ensuring optimal energy management and preventing depletion during idle periods.
2Duration of action of stationary object
If the charging period lasts longer than needed to reach target state of charge, then the battery reaches target SoC early, but energy continuously depletes during the time period between reaching target SoC and vehicle operation
Solution Approach 1:
The system dynamically adjusts the charging rate based on the detected idle period duration and EVSE restart functionality. By changing the charging parameters (charging rate) according to the specific conditions, the system optimizes the charging process to reach the target SoC at the right time, minimizing energy depletion during idle periods while ensuring the battery is adequately charged for the next operation.
3Loss of energy
If the EVSE has automatic restart functionalities, then energy depletion during idle periods is mitigated, but the system complexity increases and technical malfunctions may occur
Solution Approach 1:
Instead of relying on the EVSE's automatic restart functionality, the system performs a preliminary functionality test to identify whether the EVSE has restart capability. Based on this test result, the vehicle's computer system takes control to manage the charging process, thereby avoiding the complexity and potential malfunctions of the EVSE's restart mechanism while still achieving the benefit of preventing energy depletion.
Data Source
AI summary
A computer system for controlling charging of an electric vehicle (EV) the computer system comprising processing circuitry configured to: perform a functionality test routine in response to the EV being connected to an Electric Vehicle Supply Equipment (EVSE) the functionality test routine being adapted to identify a charging restart functionality in the EVSE; determine, based on an outcome of the functionality test routine, an anomaly or absence of the charging restart functionality of the EVSE; and in response to determining the anomaly or absence of the charging restart functionality, control a charging rate provided by the EVSE to the EV.