Hydrogen Supply Temperature Control via Vaporizer Pump Feedback
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Solution Overview
Problem
Hydrogen engine vehicles face challenges in maintaining the temperature of hydrogen gas within a predetermined range, as excessive temperature can reduce engine output and extremely low temperatures can damage piping, necessitating a controlled temperature management system.
Innovation Solution
A hydrogen supply device with a heater, vaporizer, circulation path, and control unit that adjusts the circulation pump's operation based on the temperature of the heating medium and power device output to maintain the hydrogen gas temperature within a predetermined range, using a base drive duty calculation and correction coefficient to dynamically adjust the flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the temperature of hydrogen gas is increased to improve vaporization efficiency, then the vaporization rate improves, but the engine output is reduced due to excessive temperature
Solution Approach 1:
The control unit receives temperature information from a temperature sensor that detects the temperature of the heating medium flowing out of the vaporizer, and adjusts the circulation pump operation based on this feedback to maintain hydrogen gas temperature within an optimal range for engine output
Solution Approach 2:
The system changes the flow rate parameter of the circulation pump dynamically based on temperature conditions, adjusting the heating medium circulation to control hydrogen gas temperature and prevent engine output reduction
2Productivity
If the temperature of hydrogen gas is decreased to improve combustion efficiency, then combustion efficiency improves, but piping is damaged by extremely low temperature
Solution Approach 1:
The control unit uses temperature sensor feedback to monitor the temperature of the heating medium and adjusts the circulation pump to maintain temperature within a safe range that ensures piping integrity while allowing efficient combustion
Solution Approach 2:
The system performs preliminary heating of the hydrogen gas through the vaporizer before supply to the engine, ensuring the gas temperature is sufficiently high to prevent piping damage while maintaining combustion efficiency
3Temperature
If the circulation pump flow rate is increased to control temperature, then temperature control improves, but energy consumption increases
Solution Approach 1:
The circulation pump operates dynamically with variable flow rates controlled by the control unit based on real-time temperature conditions, adjusting energy consumption to match actual temperature control requirements rather than operating at constant high flow
Solution Approach 2:
The system uses the vehicle's waste heat from the engine or motor to heat the heating medium in the heater, reducing the need for additional energy input to the circulation system while maintaining temperature control
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
Effectively maintains the hydrogen gas temperature within a predetermined range, preventing output reduction and piping damage, while accommodating changes in power device output through advanced control of the circulation pump.
Implementation Method 1
a heater that heats a heating medium
Implementation Method 2
a vaporizer that vaporizes liquid hydrogen into a hydrogen gas using the heated heating medium
Implementation Method 3
a circulation pump provided in the circulation flow path to pump the heating medium
Data Source
AI summary
It includes a heater, a vaporizer, a circulation flow path for circulating a heat medium between the heater and the vaporizer, a circulation pump, and a control unit, and the control unit is supplied with hydrogen gas flowing out from the vaporizer. The output of the power unit to be output and the temperature of the heat medium flowing out from the vaporizer are input, and the drive duty command value of the circulation pump is calculated based on the temperature of the heat medium flowing out from the vaporizer and the output of the hydrogen engine, and the circulation pump is driven based on the calculated drive duty command value.