Vehicle Control Device Eco-Mode Vibration Suppression
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Solution Overview
Problem
Existing vehicle control systems fail to adequately manage various driving states and suppress vibrations when the eco-switch is ON, as merely suppressing torque commands to rotating electric devices is insufficient.
Innovation Solution
A vehicle control device that includes a drive element with a rotating electric device, a power supply device, and a control element capable of switching between normal and restricted operation condition maps to manage fuel-efficient running commands, engine start/stop requests, and damping control, using sine wave and rectangular wave control modes to optimize torque and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If torque command to rotating electric device is suppressed to achieve fuel efficiency, then energy consumption is reduced, but the system cannot adequately manage various driving states and suppress vibrations during engine start/stop operations
Solution Approach 1:
The control system dynamically switches between two operation condition maps (normal and restricted) based on the eco-switch state and driving conditions. When eco-switch is ON and engine start/stop is detected, the system transitions from restricted map to normal map temporarily, enabling adaptive response to varying driving states while maintaining overall fuel efficiency
Solution Approach 2:
The system changes operational parameters by switching between different operation condition maps that define different torque command characteristics. The restricted operation condition map uses reduced torque commands for fuel efficiency, while the normal operation condition map uses full torque commands for adequate vibration suppression during engine start/stop operations
2Loss of energy
If torque command to rotating electric device is suppressed, then fuel efficiency is improved, but vibrations during engine start/stop cannot be adequately suppressed
Solution Approach 1:
The control system dynamically adjusts torque command characteristics by switching between operation condition maps based on real-time detection of engine start/stop requests. This dynamic adaptation allows the system to provide adequate vibration suppression only when needed (during engine start/stop) while maintaining fuel-efficient operation during normal driving states
Solution Approach 2:
The system changes the torque command parameters by selecting different operation condition maps. The restricted map reduces torque commands to minimize energy loss, while the normal map restores full torque command capability to suppress vibrations during engine start/stop operations
3Use of energy by moving object
If restricted operation condition map is used during eco-switch ON, then power consumption is reduced, but the system lacks sufficient control range for various driving states
Solution Approach 1:
The control system dynamically switches between restricted and normal operation condition maps based on the eco-switch state and detected driving conditions. This dynamic switching enables the system to maintain a wide effective control range by adapting to different driving states (normal driving vs. engine start/stop operations) while preserving fuel efficiency during eco-mode operation
Solution Approach 2:
The dual operation condition map system provides multi-functionality: the restricted map handles normal fuel-efficient driving, while the normal map handles special conditions requiring full control authority. This universal approach allows a single control system to effectively manage both fuel efficiency and adequate vibration suppression across all driving states
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 system effectively achieves fuel efficiency and suppresses vibrations during engine start/stop operations by switching between operation condition maps, ensuring power performance and comfort while the eco-switch is ON.
Implementation Method 1
a power supply device (30) electrically connected to the rotating electric device (24)
Data Source
AI summary
A vehicle control device (10) comprises a driving device (20) including an engine (22) and a rotary electric machine (24), a power circuit (30) connected to the rotary electric machine (24), a control part (50), and an ecoswitch (42). The CPU (52) of the control part (50) comprises a low fuel consumption travel instruction judgment module (60) for judging on or off of the ecoswitch (42), an operation condition switch module (62) for switching the operation condition of the rotary electric machine on the basis of the on or off of the ecoswitch (42), an engine state judgment module (64) for judging whether or not the engine (22) is in a started state or a stopped state, and a damping control module (68) for carrying out damping control when the engine (22) is stalled or stopped.