Driveline Stiffness Control via Slip Amount Adjustment
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Solution Overview
Problem
Traditional engine control systems for internal combustion engines do not accurately control engine output torque and fail to provide rapid responses to control signals, leading to potential vibration issues when the slip amount between engine output speed and transmission input speed is zero.
Innovation Solution
A control system comprising a torque determination module, a control module, and a transmission control module that determines engine torque and selectively increases the slip amount above zero when the torque exceeds a predetermined level, using a computer program executed by processors to manage engine and transmission interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slip amount between engine output speed and transmission input speed is maintained at zero, then torque transfer efficiency is improved, but vibration occurs when engine torque exceeds a predetermined level
Solution Approach 1:
The patent applies dynamics by making the slip amount adjustable rather than fixed at zero. The control system dynamically modifies the slip amount between engine output speed and transmission input speed based on detected vibration levels, allowing the system to transition between locked (zero slip) and unlocked (non-zero slip) states to balance efficiency and vibration suppression
Solution Approach 2:
The patent changes the parameter of slip amount from a fixed value (zero) to a variable parameter that can be adjusted based on operating conditions. When vibration is detected, the control system increases the slip amount above zero, effectively changing the driveline stiffness parameter to reduce vibration while maintaining the ability to operate at zero slip for optimal efficiency
2Device complexity
If traditional engine control systems are used, then system complexity is reduced, but torque control accuracy and response speed are insufficient
Solution Approach 1:
The patent implements feedback by using a vibration detection mechanism that continuously monitors driveline vibration and feeds this information back to the control system. Based on the feedback signal indicating vibration levels, the control system automatically adjusts the slip amount, creating a closed-loop control system that improves torque control accuracy without requiring overly complex hardware
Solution Approach 2:
The control system performs multiple functions: it monitors engine torque, detects vibration, determines slip amount, and controls transmission engagement. By integrating these functions into a single control module, the system achieves high torque control accuracy and rapid response without proportionally increasing overall system complexity
Data Source
AI summary
A control system for a vehicle, comprises a torque determination module, a control module, and a transmission control module. The torque determination module determines torque produced by an internal combustion engine. The control module sets a signal to an active state when the torque is greater than a predetermined torque and a slip amount between an engine output speed and a transmission input speed is zero. The predetermined torque corresponds to a potential vibration amount when the slip amount is zero. The transmission control module selectively increases the slip amount above zero in response to the setting of the signal to the active state.