Vehicle Drive Force Control for Wavy Road Resonance
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Solution Overview
Problem
Existing vehicle control systems face challenges in suppressing excessive torque input to drive system components and mounts when driving on wavy roads, as uniform upper limit values for drive force may not accurately account for varying road conditions and locations, leading to inadequate power performance.
Innovation Solution
A control device that dynamically sets an upper limit value for drive force based on current position information and predetermined characteristics, considering variations in rotation speed, drive forces, and weather conditions, to ensure appropriate power transmission and reduce excessive input during wavy road driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform upper limit value for drive force is set regardless of wavy road location, then the control system is simple to implement, but the upper limit value may deviate from appropriate values for specific locations, making it unable to suppress excessive input to drive system components or deteriorate power performance
Solution Approach 1:
The patent applies local quality by setting different upper limit values for drive force based on the specific location of wavy roads. The control device determines the vehicle's current position and selects appropriate upper limit values from a map that stores location-specific parameters. This ensures that each location receives a tailored upper limit value that accurately reflects its unique road conditions, thereby reliably suppressing excessive input to drive system components without using a one-size-fits-all approach.
2Device complexity
If a uniform upper limit value for drive force is set regardless of wavy road location, then the control system is simple to implement, but power performance may be deteriorated due to inappropriate limitation
Solution Approach 1:
The patent applies local quality by setting different upper limit values for drive force based on the specific location of wavy roads. The control device determines the vehicle's current position and selects appropriate upper limit values from a map that stores location-specific parameters. This ensures that each location receives a tailored upper limit value that accurately reflects its unique road conditions, thereby reliably suppressing excessive input to drive system components without using a one-size-fits-all approach.
3Reliability
If location-specific upper limit values are set for different wavy road locations, then appropriate suppression of excessive input and maintenance of power performance are achieved, but the control system complexity increases due to position information processing and characteristic storage
Solution Approach 1:
The patent applies preliminary action by pre-storing characteristic information and upper limit values for multiple wavy road locations in a map before the vehicle encounters them. The control device determines the vehicle's current position and retrieves the appropriate upper limit value from this pre-prepared map. This approach avoids the need for real-time calculation or complex analysis when the vehicle is actually on a wavy road, thereby reducing the computational burden and control system complexity while maintaining reliable suppression of excessive input.
4Reliability
If location-specific upper limit values are set for different wavy road locations, then appropriate suppression of excessive input and maintenance of power performance are achieved, but the control system complexity increases due to characteristic storage requirements
Solution Approach 1:
The patent applies preliminary action by pre-storing characteristic information and upper limit values for multiple wavy road locations in a map before the vehicle encounters them. The control device determines the vehicle's current position and retrieves the appropriate upper limit value from this pre-prepared map. This approach avoids the need for real-time calculation or complex analysis when the vehicle is actually on a wavy road, thereby reducing the computational burden and control system complexity while maintaining reliable suppression of excessive input.
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
This solution effectively limits excessive torque input, ensuring power performance and preventing damage to drive system components and mounts by setting drive force limits tailored to specific wavy road locations and conditions, thereby enhancing vehicle stability and durability.
Implementation Method 1
an input to the vehicle is amplified by resonance between the input to the vehicle due to unevenness of a road surface and the natural frequency of the vehicle, a suspension
Data Source
AI summary
A control device of a vehicle includes a power transmission device transmitting a power of a power source to drive wheels, the control device comprises: a drive force limiting portion limiting a drive force of the vehicle by an upper limit value when the vehicle is running on a wavy road and a value representing a variation in a predetermined rotation speed of a drive system component disposed between the power source to the drive wheels is equal to or greater than a resonance determination value; an upper limit value setting portion setting the upper limit value to a value corresponding to the wavy road on which the vehicle is currently running, based on current position information indicative of a current position of the vehicle.