Vehicle Driving Force Control with Dynamic Vibration Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicular driving force control systems fail to effectively suppress torsional vibrations in the drivetrain, particularly when the target driving force is small, leading to deteriorated response and drivability issues, and during shift operations, where engine torque reduction for vibration suppression can result in delayed shift timing and unpleasant sensations.
Innovation Solution
A vehicular driving force control apparatus and method that sets a target driving force, predicts vibrations, corrects the driving force by filtering out resonant frequency components, and adjusts the filter process's impact based on the target driving force, prioritizing acceleration response over vibration suppression when the target driving force is small and vice versa, and specifically manages the filter process during shift operations to ensure quick shift timing and reduced torque fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If engine torque is reduced to suppress torsional vibration in the drivetrain, then vibration suppression is improved, but acceleration response deteriorates
Solution Approach 1:
The patent applies dynamics by making the filter gain adjustable based on operating conditions. The gain is set to a first value during acceleration phases to prioritize response, and a second value during steady-state operation to prioritize vibration suppression. This dynamic adjustment resolves the contradiction by adapting the vibration suppression intensity to the current driving phase.
Solution Approach 2:
The patent changes the parameter of filter gain based on accelerator pedal depression rate and engine operating conditions. When the accelerator pedal depression rate exceeds a threshold during acceleration, the gain is reduced to maintain response. This parameter change allows the system to balance vibration suppression with acceleration response requirements.
2Stability of the object's composition
If uniform filter gain is used during all acceleration phases, then vibration suppression consistency is improved, but acceleration response deteriorates when target driving force is small
Solution Approach 1:
The patent implements dynamic gain adjustment based on the accelerator pedal depression rate and target driving force. During acceleration with small target driving force, the gain is reduced to maintain response. During steady-state operation with large target driving force, the gain is increased for consistent vibration suppression. This dynamic approach resolves the contradiction between consistency and response.
Solution Approach 2:
The patent applies different filter gain values to different operating conditions. Instead of a uniform gain, the system uses a first gain value for acceleration phases and a second gain value for steady-state phases. This local quality approach allows optimization for each specific operating condition, resolving the contradiction between consistency and response.
3Object-affected harmful factors
If engine torque is reduced for vibration suppression during shift control, then torsional vibration is suppressed, but shift timing is delayed and drivability deteriorates
Solution Approach 1:
The patent dynamically adjusts the filter gain during shift operations based on the accelerator pedal depression rate and current driving phase. During acceleration phases including shift operations, the gain is reduced to ensure quick shift timing and maintain drivability. This dynamic adjustment resolves the contradiction between vibration suppression and shift timing.
Solution Approach 2:
The patent anticipates the need for quick shift response by reducing the filter gain before and during shift operations when acceleration is detected. This preliminary anti-action prevents the delay in shift timing that would occur if full vibration suppression were applied, thereby maintaining drivability during critical shift phases.
Data Source
AI summary
A program is executed which includes a step (S100) of calculating a base required driving force, a step (S200) of calculating a reference driving force, a step (S400) of calculating a final required driving force on which a vibration suppression filtering process has been performed when the base required driving force is greater than a reference driving force, and a step (S500) of calculating a final required driving force on which the vibration suppression filtering process has not been performed when the base required driving force is equal to or less than the reference driving force.