Fuel Cell Air Compressor Speed Prediction
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Solution Overview
Problem
In fuel cell systems, communication delays between control units lead to incorrect rotational speed data, resulting in excessive command torque generation for the air compressor, causing surplus power to be supplied to the battery and potential overload.
Innovation Solution
Implementing a predictive rotational speed value for the air compressor, calculated based on actual and past torque data, to determine a limit torque within permissible power levels, ensuring command torque does not exceed these limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotational speed data is transmitted from the first control unit to the second control unit, then the second control unit can determine command torque for the air compressor, but communication delay causes the rotational speed data to be outdated and results in excessive command torque generation
Solution Approach 1:
The second control unit predicts the current rotational speed of the air compressor based on the received rotational speed data and the command torque from the previous control cycle. This preliminary calculation of rotational speed allows the system to compensate for communication delays and obtain an accurate estimate of the current rotational speed before determining the command torque.
2Power
If command torque is increased to meet fuel cell output requirements, then power supply capability is improved, but excessive torque causes surplus power to be supplied to the battery resulting in potential overload
Solution Approach 1:
The second control unit determines the command torque for the air compressor based on the predicted rotational speed, the fuel cell output requirements, and feedback from the current system state. This feedback mechanism ensures that the command torque is optimized to meet power requirements while preventing excessive torque that would cause surplus power supply and potential battery overload.
Data Source
AI summary
An MG-ECU obtains a rotational speed Na of an ACP. The MG-ECU transmits the obtained rotational speed (a PM reception rotational speed) Na of the ACP to a PM-ECU through communication. The PM-ECU obtains a rotational speed predicted value Np by adding a rotational speed change width Cvw to the PM reception rotational speed Na received from the delayed MG-ECU. A limit torque Tr12 is obtained through the use of the obtained rotational speed predicted value Np and an ACP permissible power level line L1.