Electric Vehicle Running Gear Rapid Acceleration Control
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Solution Overview
Problem
Conventional electric vehicle running gears struggle to respond effectively to rapid acceleration requests from riders, particularly in two-wheeled vehicles, due to limitations in power supply management from batteries and capacitors.
Innovation Solution
A running gear system incorporating an electric motor, a driving battery, a capacitor, a throttle sensor, and a control unit that manages power supply based on the rate of change of the throttle manipulated variable, utilizing both the driving battery and capacitor to ensure rapid acceleration, with notification devices to inform the rider of energizable periods and acceleration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power is supplied from the driving battery or capacitor based on the absolute value of the accelerator manipulated variable, then the electric vehicle can operate with a simple control system, but the response to rapid acceleration requests is insufficient
Solution Approach 1:
The control system dynamically adjusts power supply strategy based on the time change rate of the accelerator manipulated variable. When the time change rate exceeds a threshold, the system switches to a rapid acceleration mode that prioritizes capacitor discharge, thereby adapting the control behavior to the urgency of the acceleration request while maintaining overall system simplicity
Solution Approach 2:
The system changes the control parameter from using only the absolute value of the accelerator manipulated variable to incorporating the time change rate. This parameter change enables the control system to distinguish between gradual and rapid acceleration requests, improving response speed for rapid requests without significantly complicating the control architecture
2Speed
If the capacitor supplies power for rapid acceleration, then the acceleration response is improved, but the capacitor depletes quickly and requires frequent recharging
Solution Approach 1:
The system performs preliminary action by pre-charging the capacitor during periods when the driving battery has sufficient power. The control unit monitors battery charge levels and proactively charges the capacitor in advance, so that when rapid acceleration is needed, the capacitor is already charged and ready to provide immediate power without delay
Solution Approach 2:
The system maintains continuous useful action by establishing a seamless power supply chain between the driving battery and capacitor. The control unit continuously manages power flow, ensuring the capacitor is recharged from the driving battery whenever possible, thereby maintaining the capacitor's readiness for rapid acceleration without interrupting the overall power supply continuity
3Use of energy by moving object
If the control unit monitors battery remaining amounts and manages power supply strategically, then the power usage is optimized, but the control complexity increases
Solution Approach 1:
The control unit implements feedback by continuously monitoring the remaining power levels of both the driving battery and capacitor. Based on this feedback, the control unit dynamically adjusts the power supply strategy, deciding when to discharge the capacitor for rapid acceleration and when to recharge it from the driving battery, thereby optimizing power usage through real-time information
Solution Approach 2:
The system applies self-service by enabling the control unit to autonomously manage power distribution without requiring external intervention. The control unit independently monitors battery states, determines optimal power supply strategies, and executes recharging operations, thereby achieving efficient power management through self-contained control logic
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 enhances the response to rapid acceleration requests by efficiently managing power supply from both batteries and capacitors, ensuring improved performance and informing riders of their acceleration capabilities, thereby optimizing power usage and rider experience.
Implementation Method 1
a capacitor (57), as a power supply for the electric motor (52)... The capacitor (57) supplies power to the electric motor (52)
Implementation Method 2
a driving battery (56), as a power supply for the electric motor (52)... The driving battery (56) supplies power to the electric motor (52)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
To provide a running gear that ensures responding to a rapid acceleration request from a rider. A running gear 53 includes an electric motor 52, a driving battery 56 that supplies power to the electric motor 52, a capacitor 57 that supplies power to the electric motor 52, a throttle sensor 71 that detects a throttle manipulated variable by an occupant, and a PCU 54 as a control unit that controls a power supply amount to the electric motor 52 in accordance with a throttle manipulated variable. The PCU 54 controls the power supply to the electric motor 52 based on a time change rate of the throttle manipulated variable.