Hybrid Vehicle Power Control for Battery-Independent Acceleration
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Solution Overview
Problem
Vehicles propelled by electric motors face delays in responding to acceleration instructions due to the state of charge of their energy storage devices, leading to increased fuel consumption as they store power before increasing output.
Innovation Solution
A vehicle system that reduces the load torque of the power generation electric motor before an acceleration instruction, increasing the engine's rotation speed to ensure prompt power output without delaying the response to acceleration, thereby maintaining reproducibility regardless of the energy storage state while minimizing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electric power is supplied from the energy storage device to the propulsive electric motor to improve acceleration responsiveness, then the responsiveness of acceleration is improved, but the fuel consumption increases when the energy storage device is in a low charge state
Solution Approach 1:
The controller increases the engine rotation speed in advance before the acceleration instruction is input, so that when acceleration is requested, the engine can immediately provide sufficient power without needing to store energy beforehand, enabling rapid response while avoiding excessive fuel consumption during normal operation
Solution Approach 2:
The system dynamically adjusts the engine rotation speed based on the charge state of the energy storage device and the anticipated acceleration needs, optimizing the balance between responsiveness and fuel consumption by making the rotation speed variable rather than fixed
2Speed
If the engine rotation speed is increased in advance to improve acceleration response, then the acceleration responsiveness is improved, but the fuel consumption increases during normal operation
Solution Approach 1:
The controller increases the engine rotation speed in advance before the acceleration instruction is input, so that when acceleration is requested, the engine can immediately provide sufficient power without needing to store energy beforehand, enabling rapid response while avoiding excessive fuel consumption during normal operation
Solution Approach 2:
The system changes the engine rotation speed parameter dynamically based on the charge state of the energy storage device and driving conditions, adjusting it to an increased state before acceleration is needed and returning to normal afterward, optimizing the balance between responsiveness and fuel consumption
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
The vehicle achieves prompt and reproducible power output in response to acceleration instructions without relying on high energy storage levels, reducing fuel consumption and maintaining efficient engine operation.
Implementation Method 1
a power generation electric motor disposed so as to operate in conjunction with the crankshaft and configured to be driven by the engine to generate electric power
Implementation Method 2
a propulsive electric motor configured to receive electric power from the energy storage device and/or the power generation electric motor so as to output power
Implementation Method 3
an engine having a rotatable crankshaft and configured to output power generated by combustion
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
To provide a vehicle having reproducibility of the response of output to an acceleration instruction regardless of the energy storage state of an energy storage device while suppressing the increase of the fuel consumption. The vehicle of this teaching controls an engine and the power generation electric motor such that electric power supplied to the propulsive electric motor is increased in response to an acceleration instruction, and when the propulsion system is driven only by the power outputted from the propulsive electric motor, the rotation speed of the engine is increased by reducing the load torque of the power generation electric motor at least according to the amount of remaining charge of a battery before the acceleration instruction such that a target power according to the acceleration instruction will be outputted, by the acceleration instruction as a trigger, from the propulsive electric motor driven by the electric power supplied from the battery and/or the power generation electric motor regardless of the amount of remaining charge of the battery.