Fuel Cell Vehicle Startup Power Switching at Low Temperature
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Solution Overview
Problem
Existing fuel cell vehicles do not consider switching between EV start and HV start based on temperature and state of charge (SOC) when starting at low temperatures, leading to inefficiencies and potential power insufficiencies.
Innovation Solution
A fuel cell vehicle system that includes a power source comprising a fuel cell and a battery, with temperature and SOC acquisition units, and an electric power supply control unit to select the appropriate power source for the drive unit based on temperature and SOC, allowing for EV start or HV start to ensure timely and efficient power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fuel cell is used as the power source at low temperatures, then the demanded electric power can be satisfied, but the vehicle must wait for fuel cell activation which delays starting
Solution Approach 1:
The system dynamically switches between EV start and HV start modes based on real-time temperature and SOC conditions. The power supply mode is not fixed but adapts to environmental conditions, allowing the vehicle to optimize between quick start (EV start) and power sufficiency (HV start) based on current operational context
Solution Approach 2:
The control unit changes operational parameters (power supply mode, temperature thresholds, SOC levels) based on environmental conditions. By adjusting these parameters dynamically, the system resolves the contradiction between quick starting and power sufficiency at low temperatures
2Loss of time
If only the battery is used as the power source, then the vehicle can start quickly without waiting for fuel cell activation, but the demanded electric power cannot be satisfied at low temperatures
Solution Approach 1:
The system employs dynamic mode switching between EV start and HV start based on real-time monitoring of temperature and battery SOC. This dynamic adaptation allows the vehicle to select the appropriate power supply configuration for current conditions, resolving the contradiction between quick starting and power sufficiency
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the battery and fuel cell systems. It determines the optimal power supply configuration by mediating between the quick-start capability of the battery and the power sufficiency of the fuel cell, selecting EV start or HV start based on environmental conditions
3Device complexity
If the system does not switch between EV start and HV start based on temperature and SOC, then the control logic is simpler, but energy efficiency and power stability are reduced
Solution Approach 1:
The control unit continuously monitors temperature and battery SOC, using this feedback to dynamically determine the optimal power supply mode. This feedback mechanism enables the system to adapt to changing conditions and optimize energy efficiency, resolving the contradiction between control simplicity and energy efficiency
Solution Approach 2:
The system transitions from static control logic to dynamic control that adapts to real-time conditions. By making the control logic dynamic rather than fixed, the system achieves better energy efficiency and power stability while maintaining manageable complexity through rule-based decision making
Data Source
AI summary
A fuel cell vehicle includes each of an FC stack and a battery, as a power source for supplying electric power to a DU. The fuel cell vehicle also includes a temperature acquisition unit that acquire a temperature of a power source, an SOC acquisition unit that acquires an SOC of the battery, an electric power supply control unit that selects the power source which supplies the electric power to the DU when the fuel cell vehicle is activated, based on a temperature of the power source and the SOC of the battery.