Vehicle Torque Control via Clutch Feedback
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Solution Overview
Problem
Existing vehicle control systems fail to effectively reduce vibrational vehicle behavior caused by elastic torsion elements in torque transmission systems, leading to uncomfortable vehicle pitching during starting and shifting, particularly in lightweight vehicles with high torque requirements.
Innovation Solution
A vehicle control device that includes a controller programmed to correct torque generation based on the torsion rate of elastic torsion elements in the torque transmission system, reducing torsional vibration by controlling clutch transmission torque and using a clutch damper to manage shock, while estimating downstream rotation speed without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a clutch damper is provided downstream of the clutch to reduce shock in torque transmission, then ride comfort is improved, but torsional vibration increases causing vehicle pitching
Solution Approach 1:
The controller computes the torsion rate of the elastic torsion element based on rotation speeds from sensors and uses this feedback to dynamically adjust clutch transmission torque. The controller calculates torsional vibration components and generates correction values that are applied to the clutch control, creating a closed-loop feedback system that actively suppresses torsional vibration while maintaining the shock-absorbing function of the clutch damper
Solution Approach 2:
The system dynamically changes the transmission torque parameter of the clutch based on computed torsion rate and estimated torsional vibration components. By adjusting the clutch torque command value in real-time according to vibration conditions, the system optimizes both shock reduction and vibration suppression without requiring structural modifications to the clutch damper
2Weight of moving object
If the torque transmission path downstream of the clutch has small rigidity to satisfy light weight requirements, then vehicle weight is reduced, but torsional vibration increases
Solution Approach 1:
The invention replaces mechanical reinforcement of the torque transmission path with an electronic control system. Instead of increasing the rigidity of downstream components mechanically (which would increase weight), the system uses sensor data and controller algorithms to compute and counteract torsional vibration, achieving vibration suppression through electronic intervention rather than mechanical strengthening
Solution Approach 2:
The controller continuously monitors rotation speeds and computes torsion rate to detect torsional vibration in the lightweight torque transmission path. This feedback information is used to generate correction values that adjust clutch torque, creating an active vibration cancellation system that enables lightweight construction without compromising vibration control
3Measurement precision
If additional sensors are installed to detect downstream rotation speed for accurate torsion rate computation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The invention introduces a computational intermediary (the controller) that estimates downstream rotation speed and torsional vibration components using existing sensor data and mathematical models. Instead of directly measuring downstream speed with additional sensors, the controller acts as an intermediary that computes the required information from upstream sensor readings and transmission parameters, avoiding the need for physical sensor installation in the downstream path
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
The solution significantly reduces vibrational vehicle behavior and improves ride comfort by accurately computing and correcting torque to mitigate torsional vibrations, enhancing vehicle performance in lightweight, high-torque vehicles.
Implementation Method 1
a clutch damper is often provided downstream of the clutch to reduce a shock occurring in the torque transmission
Implementation Method 2
an elastic torsion element present in the torque transmission path downstream of the clutch is elastically distorted, and torque transmission is started
Data Source
AI summary
A controller for a vehicle driven by transmitting a torque generated by a torque generator to driving wheels corrects the torque generated by the torque generator according to a torsion rate of an elastic torsion element present in a torque transmission system extending from the torque generator to the driving wheels to reduce the torsional vibration of the elastic torsion element. The torque generator may include an engine and a clutch to transmit a rotation of the engine to the torque transmission system. The controller may include a clutch controller to correct the torque generated by the torque generator by controlling the transmission torque of the clutch according to the torsion rate of the elastic torsion element.