Vehicle Torque Control by Resonance-Tuned Mode Switching
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Solution Overview
Problem
Existing vehicle control devices face challenges in suppressing vibration while maintaining torque responsiveness, particularly in vehicles with multiple travel modes, as conventional methods either suppress vibration at the cost of reduced torque responsiveness or vice versa.
Innovation Solution
The vehicle control device sets the target lowering time for torque reduction at the accelerator off time to n times the inverse of the resonance frequency of the drive system, where n is an integer greater than 1 and varies based on the travel mode, allowing for both vibration suppression and mode-specific torque responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the torque output to the drive shaft is reduced slowly to suppress torsion and vibration, then vibration is suppressed, but the torque responsiveness is deteriorated
Solution Approach 1:
The patent applies dynamics by making the target lowering time variable according to the travel mode. The control system dynamically adjusts the torque reduction rate based on the selected mode (first mode or second mode), allowing the system to adapt between vibration suppression and torque responsiveness requirements. This is achieved by setting different target lowering times for different travel modes, where the second mode prioritizes torque responsiveness with a shorter target lowering time while the first mode prioritizes vibration suppression with a longer target lowering time.
2Stability of the object's composition
If a fixed target lowering time is used for torque reduction, then vibration suppression is consistent, but the torque responsiveness cannot match different travel modes
Solution Approach 1:
The patent applies parameter changes by modifying the target lowering time parameter based on the travel mode. The control system changes this critical parameter to achieve different operational characteristics: in the first mode, a longer target lowering time is used for consistent vibration suppression, while in the second mode, a shorter target lowering time is used to prioritize torque responsiveness. This parameter adjustment allows the system to adapt to different travel mode requirements without compromising vibration suppression consistency.
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 approach effectively suppresses vibration and enhances torque responsiveness in different travel modes by adjusting the torque reduction time according to the mode, ensuring optimal performance in various driving conditions.
Implementation Method 1
set the target lowering time to n times an inverse of a resonance frequency of a drive system including the power source
Data Source
AI summary
A vehicle control device for controlling a power source so as to drive a vehicle in a selected one of a plurality of modes so as to drive the vehicle in at least one power source for outputting power to a drive shaft connected to the axle, and for controlling the power source so as to gradually decrease the torque output to the drive shaft toward a required torque at the time of accelerator-off over a target lowering time, wherein the target lowering time is set to be n times the inverse of the resonance frequency of the drive system including the power source, and n is an integer equal to or greater than a value of 1 and is changed in accordance with the traveling mode.