Vehicle Charging Control via Power Sensing Feedback
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Solution Overview
Problem
Existing vehicle charging systems face issues with battery overcharge due to errors in battery current sensors, leading to prolonged charging and potential charger failure, which can shorten battery life and require unnecessary battery protection.
Innovation Solution
A vehicle charging system that includes a charger, a charging power sensing portion, and a charging control device to detect abnormalities and adjust charging power, ensuring appropriate charging by interrupting external charging when auxiliary equipment power consumption is excessive and resuming when it decreases, using multiple power storage devices and voltage converters to manage charging targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging control is performed based on battery current sensor readings, then charging can be managed, but sensor errors cause overcharge and prolonged charging time
Solution Approach 1:
The patent implements feedback control by continuously monitoring charging power through a dedicated sensing portion and comparing it with target values. The charging control device adjusts charging parameters based on the detected difference between actual and target charging power, creating a closed-loop control system that corrects deviations in real-time and prevents overcharge conditions.
Solution Approach 2:
The patent replaces reliance on battery current sensors with a charging power sensing portion that directly measures charging power. This substitution eliminates the measurement errors associated with current sensors by using a more accurate power detection mechanism, thereby improving charging control reliability without extending charging time.
2Duration of action of stationary object
If charging is interrupted to protect battery from overcharge, then battery life is preserved, but charging efficiency decreases
Solution Approach 1:
The patent performs preliminary detection of charging power using a dedicated sensing portion before overcharge conditions occur. By continuously monitoring and comparing charging power with target values in advance, the system can make subtle real-time adjustments to prevent overcharge, eliminating the need for abrupt charging interruptions and maintaining charging efficiency while protecting battery life.
3Ease of operation
If auxiliary equipment operates during battery charging, then vehicle functions are maintained, but charging power is consumed reducing charging effectiveness
Solution Approach 1:
The patent uses feedback control to monitor the relationship between auxiliary equipment power consumption and charging power. When auxiliary equipment consumption exceeds acceptable levels, the charging control device receives feedback and adjusts charging parameters or controls auxiliary equipment operation to maintain appropriate charging power levels, balancing vehicle functionality with charging effectiveness.
Data Source
AI summary
A charging system of a vehicle for charging a vehicle-mounted power storage device includes a charger configured to receive electric power from a power supply external to the vehicle for charging the power storage device, a charging power sensing portion for sensing charging power supplied to the power storage device, and a charging control device for performing control on the charger by generating a power command value for the charger based on a target value. The charging control device detects a difference between charging power sensed by the charging power sensing portion and the target value and determines presence/absence of abnormality of the charger based on the detected difference.