Vehicle Drive Control Using Sum-Difference Motion Models
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Solution Overview
Problem
Existing vehicle control systems for vehicles with multiple driving sources face complexity in managing straight and cornering states, leading to reduced controllability due to mixed traveling states and complex control configurations.
Innovation Solution
A design method and vehicle control device that utilize a sum model for straight driving and a difference model for cornering, calculating equivalent values to precisely grasp the motion states of left and right driving systems, enabling a simple yet effective control configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate controls are constructed for left and right driving systems to handle straight and cornering states, then the vehicle can deal with different motion states, but the control configuration becomes complex
Solution Approach 1:
The patent merges the control of left and right driving systems by introducing a center driving source that shares power with both sides. The power distribution mechanism allocates power dynamically based on whether the vehicle is in straight-line or cornering mode, unifying the control architecture while maintaining adaptability to different motion states.
Solution Approach 2:
The center driving source serves multiple functions: it provides propulsion during straight-line travel and acts as a power distribution hub during cornering. The power distribution mechanism also performs dual functions of power allocation and vibration suppression, reducing the need for separate specialized components.
2Device complexity
If a unified control system is used for both straight and cornering states, then the control configuration remains simple, but the system struggles to handle mixed traveling states effectively
Solution Approach 1:
The control system dynamically adjusts power distribution based on real-time detection of vehicle motion state. The power distribution mechanism switches between straight-line mode and cornering mode based on steering angle and wheel speed differences, enabling the unified system to adapt to mixed traveling states effectively.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor vehicle motion parameters (steering angle, wheel speeds, vibration levels) and adjust power distribution accordingly. This feedback loop enables the unified control system to respond appropriately to mixed traveling states without requiring complex separate control architectures.
3Productivity
If multiple driving sources are used to improve power distribution, then productivity increases, but vibration and slippage occur in the driving power transmission system
Solution Approach 1:
The patent intentionally introduces controlled vibration through the center driving source's power pulses to the left and right driving sources. This vibration serves to synchronize the operation of multiple driving sources, reducing slippage and improving power transmission efficiency while maintaining high productivity.
Solution Approach 2:
The system dynamically changes operating parameters (power distribution ratios, torque allocation, rotational speeds) of the multiple driving sources based on vehicle conditions. By adjusting these parameters in real-time, the system optimizes power distribution efficiency while minimizing vibration and slippage harmful effects.
Data Source
AI summary
A design method for output control of a left driving source and a right driving source in a vehicle. The design method includes: preparing a sum model modeling motion states while the vehicle is running straight, and a difference model modeling motion states while the vehicle is cornering; calculating an equivalent sum value corresponding to a sum of a left-axle input/output including an input parameter or an output parameter of the left driving system and a right-axle input/output including an input parameter or an output parameter of the right driving system (A1), and an equivalent difference value corresponding to a difference between the left-axle input/output and the right-axle input/output (A2); grasping motion states while the vehicle is running straight by applying the equivalent sum value to the sum model (A3); and grasping motion states by applying the equivalent difference value to the difference model (A4).