EV Charging Signal Line Voltage Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing communication methods between electric vehicles and charging equipment, such as control pilot communication and CAN communication, face limitations in communication speed and data volume, and when multiple communication methods are superposed on the same signal line, they can cause malfunctions due to impedance changes, leading to abnormal signal line voltages.
Innovation Solution
A charging communication system that includes an electric vehicle with a first communication device for control pilot communication, a second communication device for spread spectrum communication, and a signal line connection device that switches between the two, with a control device calculating the change in signal line voltage and disconnecting the second device if it falls outside a predetermined range, ensuring normal communication by the first device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple communication devices are connected to the same signal line, then communication functionality is improved, but signal line voltage stability deteriorates
Solution Approach 1:
A voltage management unit is introduced as an intermediary component between the signal line and the second communication device. This unit monitors signal line voltage and controls the connection state of the second communication device, preventing voltage instability from affecting the first communication device while allowing the second device to enhance communication functionality when voltage conditions are favorable.
Solution Approach 2:
The connection state of the second communication device is made dynamic rather than fixed. The voltage management unit adjusts the connection state based on real-time signal line voltage conditions, allowing the system to adapt between connecting and disconnecting the second communication device to maintain voltage stability while maximizing communication functionality when conditions permit.
2Loss of information
If the second communication device is connected to enhance data transmission, then communication capability is improved, but communication malfunction risk increases
Solution Approach 1:
The voltage management unit performs preliminary monitoring of signal line voltage before allowing the second communication device to connect and transmit data. By assessing voltage stability in advance, the system prevents connection under unfavorable conditions that would cause communication malfunctions, while still enabling enhanced data transmission when voltage conditions are confirmed to be stable.
3Adaptability or versatility
If the signal line is used for both control pilot communication and spread spectrum communication, then communication versatility is improved, but communication speed and data volume are limited
Solution Approach 1:
The system merges control pilot communication and spread spectrum communication into a single signal line infrastructure. The voltage management unit enables both communication methods to share the same physical medium by controlling when the second communication device connects, achieving communication versatility through merging while the high-speed spread spectrum communication enhances overall data transmission capability when activated.
Data Source
AI summary
In a charging communication system in which a charging control device performs communication between an electric vehicle and a charging equipment, the electric vehicle is equipped with a first communication device and a second communication device both configured to communicate with the charging equipment by using the same signal line in the charging cable; and a signal line connection device configured to switch connection/disconnection between the second communication device and the signal line. The charging control device, which controls a battery on the electric vehicle, calculates an amount of change in a signal line voltage between before and after the signal line connection device connects the second communication device to the signal line, and the charging control device causes, when the amount of change does not fall within a predetermined allowable range, the signal line connection device to disconnect the second communication device from the signal line.