Gearbox Clutch Slip Control for Shifting Jerk Reduction
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Solution Overview
Problem
Existing power shift gearboxes in vehicles experience jerking during shifting due to hydraulic engagement and disengagement of disk clutches, leading to torque variations and reduced driving comfort, requiring costly individual calibration for each gearbox arrangement.
Innovation Solution
Implementing a method to automatically control the slip of the drive clutch during power shift processes, allowing partial disengagement to maintain torque transmission and reduce jerking, using a control algorithm that adjusts the slip value based on predetermined functions and actual conditions, eliminating the need for individual calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive clutch is engaged and disengaged hydraulically without modulation during power shift, then the shifting process is simple and fast, but torque variations occur causing jerk-like motion and reduced driving comfort
Solution Approach 1:
The clutch engagement process is made dynamic through controlled slippage. The clutch is intentionally allowed to slip during engagement to gradually transmit torque, transforming the static hydraulic engagement into a dynamic controlled process that eliminates jerk while maintaining shifting speed
Solution Approach 2:
The clutch engagement parameters are changed by controlling the slip ratio and engagement force over time. Instead of direct full engagement, the system modifies the engagement parameters to include a controlled slippage phase, which smooths torque transmission and eliminates jerk during shifting
2Object-affected harmful factors
If the drive clutch is brought into slip region in a controlled sequence to avoid jerking, then driving comfort is improved, but costly individual calibration is required for each gearbox arrangement
Solution Approach 1:
The control system automatically adjusts clutch engagement parameters based on real-time feedback from sensors monitoring torque and clutch slip. This self-adjusting capability eliminates the need for manual calibration of each gearbox arrangement, as the system adapts autonomously to different operating conditions and gearbox configurations
Solution Approach 2:
A feedback control mechanism is implemented where the actual clutch slip and torque transmission are continuously monitored and compared with target values. The control system uses this feedback to automatically adjust engagement parameters, replacing costly individual calibration with an adaptive control loop that works universally across different gearbox arrangements
3Use of energy by stationary object
If the power shift gearbox is shifted under load without completely interrupting torque transmission, then operational continuity is maintained, but control precision of the clutch slip value is required to avoid oscillations
Solution Approach 1:
The mechanical clutch engagement system is supplemented with an electronic control system that precisely regulates clutch slip through electro-hydraulic actuation. This substitution of pure mechanical engagement with electronically controlled hydraulic actuation enables precise slip control while maintaining torque transmission continuity during shifts
Solution Approach 2:
The control system serves multiple functions: it controls clutch engagement, regulates slip ratio, maintains torque transmission continuity, and prevents oscillations. This multi-functional control approach allows the system to handle various shifting scenarios under load with a single integrated control strategy, reducing the need for high precision mechanical tolerances
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 reduces shifting jerking, enhances driving comfort, and allows smooth torque transmission across all gear ratios without completely interrupting engine-to-drive axle torque, thereby avoiding operational errors and simplifying production calibration.
Implementation Method 1
This concerns a method for the control of a gearbox arrangement having a power shift gearbox and a drive clutch (20)
Implementation Method 2
disk clutches shifting the various gear ratios of the power shift gearbox are engaged and disengaged hydraulically
Data Source
AI summary
The present invention relates to a method for the control of a gearbox arrangement with which a torque generated by an engine is transmitted to a drive axle of a vehicle. The gearbox arrangement includes a power shift gearbox and a drive clutch. During a shift process of the power shift gearbox, the drive clutch is disengaged at least partially so that a remaining torque is transmitted from the engine to the drive axle at an almost unchanged operating condition of the engine.