EV Coasting Torque Correction for Fuel Cell Shutdown Drift
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Solution Overview
Problem
Fuel cells in electric vehicles continue to generate power after shutdown, causing the vehicle to maintain accelerated or constant speed, leading to an unrealistic acceleration feel when the accelerator pedal is released.
Innovation Solution
A method to determine coasting torque by correcting theoretical recovery torque based on operating parameters, including additional torque and load torque, using calculation formulas to account for the fuel cell's shutdown characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the fuel cell system is shut down to save energy, then energy consumption is reduced, but the vehicle continues to move at accelerated or constant speed due to residual chemical reactions, causing unrealistic acceleration feel
Solution Approach 1:
The system performs preliminary action by pre-calculating the coasting torque curve before the fuel cell shutdown, based on historical data and current operating conditions. This allows the control system to have the correction data ready in advance, enabling smooth transition to coasting mode without abrupt changes in vehicle behavior.
Solution Approach 2:
The system implements feedback by continuously monitoring the actual vehicle deceleration behavior after shutdown and comparing it with the expected coasting behavior. The coasting torque calculation incorporates feedback from previous shutdown events to refine the correction torque, ensuring the vehicle decelerates in a realistic and controllable manner.
2Productivity
If the theoretical recovery torque is used directly for energy recovery, then energy recovery efficiency is maximized, but the fuel cell's residual power generation causes unrealistic acceleration feel
Solution Approach 1:
The system extracts the additional torque component caused by fuel cell residual power generation from the theoretical recovery torque. By separating this harmful effect and calculating it as a distinct correction torque based on operating parameters like temperature and current, the system can subtract it from the total recovery torque to achieve realistic deceleration while maintaining maximum possible energy recovery.
Solution Approach 2:
The system applies parameter changes by adjusting the coasting torque calculation based on varying operating parameters such as fuel cell temperature, current output, and vehicle speed. As these parameters change during the coasting process, the correction torque is dynamically adjusted to reflect the changing residual power generation characteristics of the fuel cell.
Data Source
AI summary
A method for determining a coasting torque, a storage medium, and a computer program are provided, this method includes: obtaining operating parameters of an electric vehicle when a fuel cell system of the electric vehicle is out of operation and the electric vehicle enters a coasting state; determining a theoretical recovery torque and a correction torque of the electric vehicle according to the operating parameters, where the correction torque includes an additional torque of the fuel cell system; and correcting the theoretical recovery torque according to the correction torque to obtain the coasting torque of the electric vehicle. The coasting torque is used for energy recovery of the electric vehicle during a coasting process of the electric vehicle.