Vehicle Control Apparatus Dynamic Driving Force Distribution
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Solution Overview
Problem
Existing vehicle control systems prioritize thermal load over stability at low speeds, leading to unstable vehicle behavior due to neglect of stability considerations during driving force distribution.
Innovation Solution
A vehicle control apparatus and method that calculates thermal load and stability priorities using thermal load and stability priority calculators, and adjusts driving force distribution between the front and rear wheels based on a comparison of these priorities to optimize both thermal load management and stability, switching between distributions as necessary to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If driving force distribution is adjusted to prioritize thermal load at low vehicle speed, then thermal load management is improved, but vehicle stability deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of driving force distribution by switching between two control modes: a first control that prioritizes thermal load management and a second control that prioritizes vehicle stability. The system dynamically selects which control mode to apply based on real-time vehicle operating conditions, allowing the control strategy to adapt to changing requirements rather than being fixed. This resolves the contradiction by making the system flexible enough to prioritize thermal load when appropriate while maintaining stability when needed.
Solution Approach 2:
The patent changes the control parameter from a single fixed driving force distribution strategy to a selectable set of strategies (first control and second control). By introducing a mode selection mechanism that allows switching between different control parameters (thermal-load-oriented vs. stability-oriented distribution), the system can optimize for thermal management in some conditions while ensuring stability in others, thus resolving the inherent contradiction between these two objectives.
2Loss of energy
If driving force distribution prioritizes thermal load management, then heat generation is minimized, but vehicle behavior becomes unstable
Solution Approach 1:
The system dynamically switches between a first control mode that minimizes heat generation through thermal-load-optimized driving force distribution and a second control mode that ensures stable vehicle behavior. This dynamic adaptation allows the system to prioritize energy efficiency when thermal management is the concern while maintaining reliability when stability becomes the priority, resolving the contradiction between minimizing heat and ensuring stable behavior.
Solution Approach 2:
The patent implements a feedback mechanism where the control system monitors vehicle operating conditions and automatically switches between control modes based on the current state. When the vehicle requires stability, the system detects this condition and activates the stability-prioritizing control, thereby providing feedback-based resolution to the contradiction between heat minimization and behavior stability.
3Device complexity
If a single control strategy is used for driving force distribution, then control simplicity is maintained, but both thermal management and stability cannot be optimized simultaneously
Solution Approach 1:
The patent segments the control strategy into two distinct control modes: a first control for thermal load management and a second control for vehicle stability. Rather than using a single complex control strategy that tries to handle all conditions, the system divides the control approach into specialized segments, each optimized for its specific purpose. The mode selection mechanism then chooses the appropriate segment based on current needs, resolving the contradiction by making the overall system effective without requiring one overly complex unified strategy.
Solution Approach 2:
The control system achieves multi-functionality by implementing a mode selection mechanism that can switch between different control strategies based on operating conditions. This universal control architecture serves multiple purposes: thermal management, stability control, and adaptive response to various driving scenarios. By making the control system multi-functional rather than single-purpose, the patent resolves the contradiction between simplicity and optimized performance.
Data Source
AI summary
A vehicle control apparatus includes a thermal load priority calculator, a stability priority calculator, and a driving force distribution controller. The thermal load priority calculator is configured to calculate a thermal load priority that prioritizes a thermal load of a motor for driving a vehicle according to an operating state of the vehicle. The stability priority calculator is configured to calculate a stability priority that prioritizes a stability of the vehicle according to an operating state of the vehicle. The driving force distribution controller is configured to control a driving force distribution in a front and a rear of the vehicle, on a basis of a result of comparing the thermal load priority and the stability priority.