Fuel Cell Vehicle Power Estimation for Stable EV Range Indication
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Solution Overview
Problem
Existing methods for determining the available output power of battery packs in fuel cell vehicles are complex and prone to high deviations due to variations in motor rotational speed and energy recovery during vehicle travel, leading to an adverse user experience with dashboard power indicators.
Innovation Solution
A method and system that monitor the current traveling state and fuel cell on-off state of a vehicle, acquire maximum peak power output by the motor, maximum output power of the battery pack, and starting-up power of the fuel cell, and determine the pure electric available power based on these parameters without requiring complex logical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing mode of determining available output power uses complicated logical operations based on transmission ratio and motor rotational speed, then the determination process can be performed, but the calculation result has high deviation and requires complex computational logic
Solution Approach 1:
The patent extracts the essential parameters needed for power determination (motor rotational speed, transmission ratio, battery pack output power) and removes unnecessary computational steps. By focusing only on the critical variables that directly affect available power, the system achieves accurate results without complex logical operations involving multiple intermediate calculations.
Solution Approach 2:
The patent changes the approach from calculating power through complex logical operations involving transmission ratios to directly measuring and using motor rotational speed as the primary parameter. This parameter transformation simplifies the determination process while maintaining or improving accuracy, as rotational speed is a direct indicator of motor output state.
2Loss of information
If the available output power is displayed on dashboard during vehicle travel, then the user can monitor power status, but the pointer jumps due to energy recovery and high deviation in calculation
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors motor rotational speed and adjusts the available power determination in real-time. By using rotational speed as the primary feedback parameter, the system can smoothly reflect power changes on the dashboard without the jumping pointer effect, as rotational speed changes more gradually than calculated power values that are subject to discrete logical operation thresholds.
3Productivity
If the motor rotational speed is used for power calculation, then the available power can be determined, but the high deviation in rotational speed leads to high deviation in calculated power
Solution Approach 1:
The patent merges the determination of available power with the direct measurement of motor rotational speed, treating them as intrinsically linked rather than separate calculation steps. By combining the rotational speed signal processing with the power determination logic into a unified system, the patent reduces cumulative errors that would otherwise occur through multiple separate calculation stages, thereby improving both speed and accuracy.
Data Source
AI summary
The present disclosure provides a method and system for determining a pure electric available power and a vehicle, the method being applied to a vehicle including a fuel cell, the vehicle further including a battery pack and a motor, the fuel cell and the battery pack being electrically connected to the motor, wherein the method includes: monitoring a current travelling state of the vehicle and a current on-off state of the fuel cell; acquiring a maximum peak power outputted by the motor, a maximum output power of the battery pack and a starting-up power of the fuel cell; and according to the current travelling state, the current on-off state of the fuel cell, the maximum peak power, the maximum output power and the starting-up power, determining the pure electric available power.