Vehicle Orientation Control via Drive Force Switching
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Solution Overview
Problem
Controlling vehicle body orientation using drive force from a motive power source when a state quantity indicating vehicle body orientation has a high amplitude leads to large variations in vehicle drive force, causing an unnatural feel for the driver.
Innovation Solution
A vehicle control device that uses motive power source orientation control when the absolute value of the amplitude of a detected state quantity is less than a predetermined value and switches to alternative orientation control means when the amplitude is equal to or greater than this value, minimizing drive force variations and reducing unnatural feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motive power source orientation control is used when state quantity amplitude is high, then vehicle body orientation control is achieved, but large variations in drive force occur causing unnatural feel for the driver
Solution Approach 1:
The control system changes the control parameter (amplitude threshold) to switch between different control modes. When the amplitude of the state quantity exceeds the threshold, the system transitions from motive power source orientation control to alternative orientation control, thereby adapting the control strategy to the current operating conditions and avoiding unnatural driver feedback
Solution Approach 2:
The system dynamically adjusts the control method based on real-time amplitude detection. By continuously monitoring the state quantity amplitude and comparing it against a threshold, the controller dynamically switches between different orientation control approaches, ensuring optimal performance and natural driver experience across varying operating conditions
2Ease of operation
If alternative orientation control means is used when amplitude is high, then drive force variations are minimized, but vehicle body orientation control effectiveness may be reduced
Solution Approach 1:
The control strategy is segmented into different modes based on amplitude thresholds. The control range is divided into low-amplitude regions (using motive power source control) and high-amplitude regions (using alternative control), allowing each segment to be optimized for its specific operating conditions while maintaining overall system effectiveness
Data Source
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AI summary
Provided are a driving state estimator unit (32) (sensor) for detecting a state quantity indicating vehicle body orientation, and a skyhook control unit (33a) (controller) for controlling vehicle body orientation using drive force from an engine (1) when the absolute value of the amplitude of the detected state quantity is less than a second predetermined value, and using force generated by a second orientation control device instead of the drive force from the engine (1) when the absolute value of the amplitude is equal to or greater than the second predetermined value.