Fuel Cell Vehicle Controller Slope Sliding Prevention
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Solution Overview
Problem
Fuel cell systems on vehicles face challenges in managing regenerative power when the vehicle is stationary on a slope, leading to potential sliding issues due to limitations in regenerative motor operation, which can restrict the vehicle's ability to move in the intended direction.
Innovation Solution
A fuel cell system with a controller that detects specific vehicle states and directs regenerative power to auxiliary machines, allowing the drive motor to generate power and prevent sliding by consuming regenerative energy through auxiliary machine operation, even when the vehicle is stationary on slopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative power is charged into the secondary battery, then energy storage is improved, but the drive motor cannot generate sufficient regenerative power to prevent vehicle sliding on slopes
Solution Approach 1:
The patent introduces an auxiliary machine as an intermediary component to consume regenerative power. When the vehicle is stationary on a slope, the auxiliary machine consumes the regenerative power generated by the drive motor, enabling the motor to maintain higher torque output for preventing vehicle sliding, while the auxiliary machine handles the energy consumption that would otherwise be limited by battery charging capacity.
2Reliability
If regenerative power is consumed by auxiliary machines, then vehicle sliding prevention is improved, but energy storage capability is reduced
Solution Approach 1:
The patent dynamically switches between two operational modes: (1) charging regenerative power into the secondary battery when the vehicle is moving or not on a slope, and (2) consuming regenerative power through auxiliary machines when the vehicle is stationary on a slope to prevent sliding. This dynamic adaptation resolves the contradiction by optimizing energy management for different operational contexts.
Solution Approach 2:
The system changes the parameter of regenerative power destination based on vehicle state. When on a slope and stationary, the regenerative power is directed to auxiliary machine consumption rather than battery charging, allowing the drive motor to generate sufficient torque for sliding prevention while maintaining energy efficiency.
3Reliability
If drive motor generates high regenerative power, then vehicle sliding is prevented, but excess power cannot be stored due to battery charging limits
Solution Approach 1:
The auxiliary machine serves as a mediator that consumes excess regenerative power that would otherwise be wasted due to battery charging limits. This allows the drive motor to generate high regenerative power for sliding prevention on slopes without causing energy loss, as the auxiliary machine utilizes the excess power.
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 enables the vehicle to maintain control and prevent sliding by effectively utilizing regenerative power, reducing the load on the secondary battery and ensuring safe movement from stationary positions on slopes.
Implementation Method 1
a drive motor configured to serve as a motor to generate a driving force by using electric power from at least one of the fuel cell and the secondary battery and as a generator to generate regenerative power that is usable to charge the secondary battery
Implementation Method 2
a fuel cell; a secondary battery connected in parallel with the fuel cell
Data Source
AI summary
A fuel cell system mounted on a vehicle includes a drive motor generating a driving force and regenerative power; an auxiliary machine consuming the regenerative power; and a controller. The controller determines that the vehicle is in a first state when the vehicle has a negative vehicle speed, a move forward request is given to the vehicle and an accelerator pedal is depressed or when the vehicle has a positive vehicle speed, the move backward request is given to the vehicle and the accelerator pedal is depressed. When a predetermined first condition including a condition that the vehicle is in the first state is satisfied, the controller performs an auxiliary machine consumption process that causes the auxiliary machine to consume the regenerative power that includes a required power for the drive motor calculated by using a depression amount of the accelerator pedal.