Vehicular Backup Device Temperature-Adaptive Charging
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Solution Overview
Problem
Existing vehicular power systems fail to account for the degree of degradation of auxiliary power sources due to temperature changes when a vehicle is stopped, leading to inefficient charging and potential damage to capacitors.
Innovation Solution
A vehicular backup device that includes a charge/discharge circuit, a temperature detection unit, and a control unit to set the charge voltage of the auxiliary power source based on the detected temperature when the vehicle is stopped, ensuring the target voltage reflects the temperature state and reduces degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the charge voltage of the auxiliary power source is set to a fixed value, then the charging control is simple, but the degradation of the auxiliary power source increases due to temperature changes during vehicle stoppage
Solution Approach 1:
The control unit detects the temperature of the auxiliary power source during vehicle stoppage (before the next charging operation) and determines the charge voltage based on this pre-detected temperature. This preliminary temperature detection and voltage determination allows the charging control to adapt to temperature changes without increasing operational complexity during actual charging.
Solution Approach 2:
The charge voltage parameter is changed based on the temperature parameter detected during vehicle stoppage. The control unit sets different charge voltages according to the temperature conditions (e.g., higher voltage for lower temperatures, lower voltage for higher temperatures), optimizing the charging process to reduce degradation while maintaining simple control logic.
2Reliability
If the charge voltage of the auxiliary power source is increased to compensate for degradation, then the reliability improves, but the degradation acceleration due to excessive voltage increases
Solution Approach 1:
The control unit adjusts the charge voltage parameter according to the detected temperature parameter, setting higher charge voltages when temperature is low (to compensate for reduced performance) and lower charge voltages when temperature is high (to prevent excessive degradation acceleration). This dynamic parameter adjustment optimizes reliability while preventing harmful degradation effects.
Solution Approach 2:
The control unit uses temperature feedback detected during vehicle stoppage to determine the appropriate charge voltage. This feedback mechanism ensures that the charge voltage is optimized based on actual temperature conditions, preventing both under-charging (which reduces reliability) and over-charging (which accelerates degradation).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively sets the target voltage to reflect the temperature state during vehicle stoppage, thereby reducing the degradation of auxiliary power sources and ensuring efficient charging upon restart, enhancing the reliability and longevity of the power system.
Implementation Method 1
a temperature detection unit configured to detect a temperature of the auxiliary power source or around the auxiliary power source
Implementation Method 2
a capacitor unit that uses a plurality of electric double layer capacitors... charging the capacitors after the start of vehicle operation to increase the charge voltage
Implementation Method 3
reduces the charge voltage by discharging the capacitors at the end of vehicle operation to suppress degradation of the capacitors
Data Source
AI summary
Provided is a technology that is able to set the charge voltage of an auxiliary power source to reflect the temperature state during a period in which the vehicle is stopped. A vehicular backup device includes a charge/discharge circuit, a temperature detection unit, and a control unit. The control unit causes the charge/discharge circuit to perform an operation such that the charge voltage of an auxiliary power source achieves a target voltage on condition that a start switch of the vehicle is ON. The control unit sets the target voltage based on the temperature detected by the temperature detection unit when the start switch is OFF.