Stationary Charging System Grouped Data Transmission
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Solution Overview
Problem
Conventional stationary charging systems with multiple charging units face challenges in reliably receiving data from all units within a predetermined time frame due to processing capability limitations, potentially leading to incomplete transmission of power unit status data to vehicles, and this can be costly to address with high-capability control units.
Innovation Solution
The system divides charging units into groups and schedules data transmission to reduce the number of items received by the control unit at one time, using a first CAN communication line for data exchange between the control unit and charging units, and a second line for communication with the vehicle, allowing for staggered data reception and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single control unit receives data from all charging units simultaneously, then data transmission is fast, but the control unit processing capability is exceeded and data reception fails
Solution Approach 1:
The charging units are divided into multiple groups (first charging unit group, second charging unit group, etc.), and the control unit receives data from each group sequentially at different time points rather than simultaneously. This segmentation of the data reception process prevents the control unit from being overwhelmed by simultaneous data from all charging units, ensuring reliable processing while maintaining overall system productivity.
2Loss of time
If the control unit processes all charging unit data simultaneously, then the response time is short, but the control unit cost increases significantly
Solution Approach 1:
The control unit performs data reception in periodic cycles, sequentially receiving data from different charging unit groups at predetermined time intervals. This periodic action allows a standard-cost control unit to handle data from multiple charging units effectively, avoiding the need for expensive high-capability control units while maintaining acceptable response times through structured time-multiplexed processing.
3Productivity
If data is transmitted from all charging units at the same time, then communication efficiency is high, but data loss occurs due to processing capability limits
Solution Approach 1:
Charging units are segmented into multiple groups that transmit data sequentially rather than simultaneously. The control unit receives data from each group at different time points, ensuring that the processing capability is not exceeded and no data is lost. This segmentation maintains communication efficiency by organizing transmissions in a structured manner while preventing information loss through manageable data loads.
Data Source
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AI summary
Provided is a stationary charging system allowing a control unit to reliably receive data from charging units, without causing cost increase. A stationary charging system 1 for charging a battery mounted in a vehicle using direct-current charging power includes a power unit 2 for generating direct-current charging power, a plurality of charging units 3 (CHG1 to CHG9) that constitute the power unit 2, a control unit (MCU) 5, and a first CAN communication line 6 for allowing data exchange between the control unit 5 and the charging units 3, each of the charging units 3 receives control command data transmitted by the control unit 5, and creates charging unit status data, andthe control unit 5 divides the chargingunits 3 into charging unit groups 4-1, 4-2, and 4-3, and transmits the control command data at varying times, whereby the charging unit status data is received at varying times.