Vehicle Control Device Managing Rotational Speed Fluctuations
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Solution Overview
Problem
Existing vehicle control systems face challenges in minimizing rotational speed fluctuations of internal combustion engines when switching between different power transmission paths, leading to increased manufacturing costs and reduced marketability due to noise and vibration issues.
Innovation Solution
A control device that manages multiple traveling modes by controlling the internal combustion engine's rotational speed through a derivation unit, which calculates the second rotational speed based on the first rotational speed, vehicle state, and reduction ratios, allowing smooth transitions between power transmission paths, including a hybrid mode using electric motor power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power transmission paths with different reduction ratios are provided to efficiently drive the vehicle in a wide range of traveling states, then the vehicle efficiency is improved, but the manufacturing cost and weight increase
Solution Approach 1:
The single power transmission path is designed to serve multiple functions by switching between different traveling modes (first traveling mode for efficient engine driving, second traveling mode for controlled speed transition). This eliminates the need for multiple dedicated transmission paths while maintaining vehicle efficiency across different operating conditions.
Solution Approach 2:
The system dynamically switches between different traveling modes based on the current operating state. The control device adjusts the traveling mode in real-time, allowing the single transmission path to adapt to different efficiency requirements without requiring multiple fixed transmission paths.
2Productivity
If multiple power transmission paths with different reduction ratios are provided to efficiently drive the vehicle in a wide range of traveling states, then the vehicle efficiency is improved, but the vehicle weight increases
Solution Approach 1:
A single power transmission path is designed to perform multiple functions by switching between different traveling modes. This eliminates the need for multiple separate transmission paths, thereby reducing the overall weight of the vehicle while maintaining efficiency across different operating conditions.
3Object-generated harmful factors
If the difference in reduction ratio between power transmission paths is reduced to suppress rotational speed fluctuation, then the noise and vibration decrease, but the number of power transmission paths must increase
Solution Approach 1:
The third traveling mode acts as an intermediary state between the first and second traveling modes. By introducing this intermediate mode, the system can transition smoothly between different reduction ratios, suppressing rotational speed fluctuations and noise without requiring multiple dedicated transmission paths with minimal ratio differences.
Solution Approach 2:
The transition between different reduction ratios is segmented into multiple steps through different traveling modes. Instead of direct switching between modes with large reduction ratio differences, the system segments the transition through intermediate modes, thereby suppressing rotational speed fluctuations without increasing the number of physical transmission paths.
4Object-generated harmful factors
If the difference in reduction ratio between power transmission paths is reduced to suppress rotational speed fluctuation, then the noise and vibration decrease, but the vehicle weight increases
Solution Approach 1:
The third traveling mode serves as an intermediary that enables smooth transitions between traveling modes with different reduction ratios. This approach suppresses noise and vibration by avoiding direct switching between modes with large ratio differences, while maintaining a single transmission path to avoid weight increase.
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 solution effectively suppresses rotational speed fluctuations during power transmission path switching, maintaining vehicle efficiency and reducing noise and vibration, while minimizing the need for multiple power transmission paths, thus lowering manufacturing costs and enhancing marketability.
Implementation Method 1
a generator configured to generate electric power by the power of the internal combustion engine
Implementation Method 2
an electric motor outputs power at least based on the electric power supplied by the generator to drive a driving wheel
Data Source
AI summary
A traveling mode setting unit configured to cause a shift to shift to a second traveling mode via a third traveling mode based on a traveling state of the vehicle traveling in the first traveling mode. The internal combustion engine control unit includes a derivation unit configured to derive a second rotational speed of the internal combustion engine at the time of transition from the third traveling mode to the second traveling mode based on a first rotational speed of the internal combustion engine at the time of transition from the first traveling mode to the third traveling mode, the traveling state of the vehicle and the second reduction ratio, and the internal combustion engine control unit is configured to control a third rotational speed of the internal combustion engine in the third traveling mode to be a value between the first rotational speed and the second rotational speed.