Drive Force Control Apparatus Smooth Transition
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Solution Overview
Problem
The existing drive force control apparatuses face challenges in smoothly transitioning from traction control to normal control, leading to drive force differences that cause vehicle behavior disturbances and increased computational load, particularly due to innate delays in the filtering process.
Innovation Solution
A drive force control apparatus that includes a first drive force setting section, a second drive force setting section, and a drive force control section, which calculates a third drive force based on the large-small relationship among the first, second, and previously calculated third drive forces, and sets this new third drive force as the target drive force after traction control operation, thereby simplifying the configuration and reducing computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the drive force control apparatus sets control content for each variety of situations to smooth out drive force difference, then the drive force transition becomes smooth, but the device complexity and computational load increase
Solution Approach 1:
The patent changes the parameter selection strategy by comparing the relative magnitudes (large-small relationships) of the first drive force, second drive force, and third drive force to determine which parameter to use as the new target drive force. This parameter-based decision making avoids complex control content settings for each situation while achieving smooth drive force transitions.
Solution Approach 2:
The patent applies different selection criteria locally based on the specific relationship between drive force values. Instead of having separate control content for each situation, it selectively applies different logic (comparing F1 vs F2, F2 vs F3, or F1 vs F3) based on the local state of the drive force parameters, thereby simplifying the overall control structure.
2Stability of the object's composition
If the drive force control apparatus uses multiple control content settings for different situations, then the drive force transition smoothness improves, but the computational load increases
Solution Approach 1:
The patent transforms the control approach from situation-based multiple content settings to parameter-based selection. By comparing the magnitudes of drive force parameters (F1, F2, F3) and selecting based on their relationships, the computational load is reduced while maintaining smooth transition performance.
Solution Approach 2:
The patent extracts the essential decision-making element from complex situation-based control and isolates it to a simple comparison of drive force parameter magnitudes. This extraction removes unnecessary computational complexity while preserving the core functionality of smooth drive force transition.
3Speed
If the drive force control apparatus immediately switches to normal control after traction control ends, then the response speed is fast, but vehicle behavior disturbances occur due to large drive force difference
Solution Approach 1:
The patent performs preliminary comparison and selection of the appropriate drive force parameter (F1, F2, or F3) before finalizing the target drive force. This preliminary action ensures that the transition to normal control is both fast and smooth, avoiding vehicle behavior disturbances while maintaining rapid response.
Solution Approach 2:
The patent uses feedback from the comparison of drive force parameters (F1, F2, F3) to dynamically determine the new target drive force. This feedback mechanism ensures that the control switching is responsive and adapts to the current state, preventing large drive force differences and resulting vehicle behavior disturbances.
Data Source
AI summary
A drive force control apparatus includes a drive force control section that has a steady drive force, a filtered drive force obtained by performing a filtering process on the steady drive force, and an internal drive force, which is calculated from a traction requested drive force, input thereto, and sets a target drive force based on the steady drive force, the filtered drive force, and the internal drive force. The drive force control section implements post-operation processing after control for causing the internal drive force to be the target drive force ends. In the post-operation processing, a new internal drive force, which is calculated based on a large-small relationship among the steady drive force, the filtered drive force, and the previously calculated internal drive force, is set as the target drive force.