Vehicle Control Device Power Shortage Charging Relay
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Solution Overview
Problem
Existing vehicle control devices cannot charge the storage battery when the system main relay is turned off during a power shortage, preventing system reactivation.
Innovation Solution
A vehicle control device that includes a power storage device, a drive device, a system main relay, and a charge circuit, which turns off the system main relay and prohibits reactivation during a power shortage but allows the relay to be turned on for charging using an external power source when the battery's power storage ratio falls below a predetermined level or its output is insufficient for travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system main relay is turned off in a power shortage to protect the system, then system reliability is improved, but the power storage device cannot be charged and the system cannot be reactivated
Solution Approach 1:
The patent segments the power line into two parts: one passing through the system main relay (for drive device control) and another bypassing the relay (for charging). This allows independent control of system protection and charging functions, resolving the contradiction between turning off the relay for reliability and maintaining charging capability.
Solution Approach 2:
The patent introduces a charging relay as an intermediary component that controls the charging circuit independently from the system main relay. This mediator allows the charging function to operate separately from the main system protection mechanism, enabling both reliability protection and charging capability to coexist.
2Object-affected harmful factors
If the system main relay is turned off during power shortage, then harmful effects on the system are prevented, but the charge circuit cannot operate to restore power
Solution Approach 1:
The power line is segmented into a drive device power line (through the system main relay) and a charging power line (bypassing the relay). This segmentation allows the charging circuit to receive power without passing through the turned-off relay, preventing system damage while enabling energy recovery through external charging.
Data Source
AI summary
A vehicle control device mounted on a vehicle includes a power storage device, a drive device configured to be driven by electric power from the power storage device, a system main relay attached to a power line between the power storage device and the drive device, and a charge circuit connected to a side of the drive device through the system main relay of the power line, in which the vehicle control device is configured to turn off the system main relay and prohibit reactivation of the system in a power shortage of the power storage device. The vehicle control device is configured to permit the system main relay to be turned on in a case where charging of the power storage device using the charge circuit is requested.