Vehicle Drive Mode Controller Threshold Logic
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Solution Overview
Problem
Existing vehicle systems lack the ability to seamlessly switch between front wheel drive, rear wheel drive, and all-wheel drive modes based on lateral acceleration, leading to inefficiencies in energy consumption and driving stability.
Innovation Solution
A vehicle system with a drive mode controller that switches between independent front wheel drive, independent rear wheel drive, and composite drive modes using different threshold values for lateral acceleration, allowing for efficient energy management and improved stability based on the engine's operational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single threshold value is used for switching between drive modes based on lateral acceleration, then the control system is simple, but the vehicle cannot efficiently balance energy consumption and driving stability under different operating conditions
Solution Approach 1:
The patent applies local quality by setting different threshold values for lateral acceleration based on the operating state of the internal combustion engine. When the engine is operating, a first threshold value is used; when the engine is stopped, a second threshold value is used. This allows the system to adapt locally to different operational contexts, optimizing both energy consumption and driving stability without requiring a complex adaptive control system.
Solution Approach 2:
The patent implements dynamics by making the threshold value dynamic rather than fixed. The threshold changes based on the engine's operational state (running or stopped), allowing the drive mode switching behavior to adapt in real-time to varying vehicle conditions. This dynamic adjustment resolves the contradiction by providing versatility without requiring a fully complex adaptive system.
2Reliability
If the vehicle switches to composite drive mode at low lateral acceleration values, then driving stability is improved, but energy consumption increases due to internal combustion engine operation
Solution Approach 1:
The patent changes the parameter of threshold value based on the engine's operational state. When the engine is running, a lower first threshold value is used, allowing earlier switching to composite drive mode for better stability. When the engine is stopped, a higher second threshold value is used, delaying switching to conserve energy. This parameter change strategy resolves the contradiction by optimizing the trade-off between stability and energy consumption for each operating condition.
3Use of energy by moving object
If the vehicle delays switching to composite drive mode to conserve energy, then energy consumption is reduced, but driving stability deteriorates under high lateral acceleration
Solution Approach 1:
The patent dynamically changes the threshold parameter based on engine state. When the engine is stopped and energy conservation is prioritized, a higher second threshold value delays switching to composite mode. However, when the engine is running, a lower first threshold value ensures earlier switching for enhanced stability. This resolves the contradiction by allowing energy-efficient operation when appropriate while ensuring stability when the engine can support composite drive mode.
Data Source
AI summary
Provided are a vehicle such that drive state can be suitably selected in a configuration including an internal combustion engine, and a vehicle control method. In a vehicle and a method of controlling the same, different values are set for a first switching threshold value for switching from a first independent drive state (in which one of a front wheel and a rear wheel is driven) to a combined drive state, and for a second switching threshold value for switching from a second independent drive state (in which the other of the front wheel and the rear wheel is driven by an internal combustion engine) to the combined drive state.