Fuel Cell Vehicle Pump Motor Torque Control via Direct Power Exchange
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Solution Overview
Problem
Fuel cell vehicle systems face limitations in the upper and lower torque limits of the air compressor motor, restricting its responsiveness and efficiency in regenerative braking and power generation, due to dependencies on secondary battery power, which hinder optimal fuel consumption and deceleration performance.
Innovation Solution
A fuel cell vehicle system where the drive motor and pump motor are connected via an electric power line, allowing direct power exchange without relying on the secondary battery, enabling the control device to adjust torque limits based on fuel cell output and battery power, thereby enhancing the motor's responsiveness and regenerative capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACP motor torque is limited by the upper-limit guard value based on battery dischargeable power, then the battery is protected from overload, but the ACP motor cannot achieve required rotation speed and sufficient deceleration power is lost
Solution Approach 1:
The patent merges the power sources by enabling direct power exchange between the drive motor and ACP motor through the electric power line, combining their power capabilities to overcome the battery's power limit and achieve higher ACP motor rotation speeds and deceleration power
Solution Approach 2:
The electric power line acts as an intermediary, allowing the drive motor to supply power directly to the ACP motor, bypassing the battery as the sole power source and enabling the ACP motor to operate beyond battery dischargeable power limits
2Reliability
If the ACP motor torque is limited by the lower-limit guard value based on battery chargeable power, then the battery charging system is protected, but the gas flow rate cannot be rapidly reduced and fuel consumption improvement is hindered
Solution Approach 1:
The patent combines the regenerative braking power of the drive motor with the ACP motor's regenerative capability, allowing both motors to recover energy simultaneously and enabling much faster gas flow rate reduction than battery charging alone can achieve
Solution Approach 2:
The electric power line serves as a mediator that enables direct regenerative power exchange between the drive motor and ACP motor, allowing the ACP motor to utilize the drive motor's regenerative power for rapid gas flow rate reduction without being constrained by battery chargeable power limits
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
This configuration improves the air compressor motor's responsiveness to speed instructions, accelerates the reduction of excess oxygen, and enhances deceleration power by optimizing torque limits, leading to improved fuel consumption and regenerative braking efficiency.
Implementation Method 1
The drive motor and the pump motor are connected to each other via an electric power line so that the drive motor and the pump motor are capable of receiving and supplying electric power with each other without involving reception and supply of electric power with the secondary battery
Implementation Method 2
a fuel cell and a secondary battery, the fuel cell vehicle comprises: a drive motor for driving a load; a pump for supplying an oxygen-containing gas to the fuel cell; a pump motor for driving the pump
Data Source
AI summary
With a fuel cell vehicle includes a fuel cell and a secondary battery, a drive motor and a pump motor are connected to each other via an electric power line so that the drive motor and the pump motor are capable of receiving and supplying electric power with each other without involving reception and supply of electric power with the secondary battery. The control device determines an upper-limit guard value of torque of the pump motor based on a dischargeable power of the secondary battery and an output power of the fuel cell, or determines a lower-limit guard value of torque of the pump motor based on a chargeable power of the secondary battery and an output power of the fuel cell.