Semiautomatic Gearbox Clutch Torque Control via Angular Velocity Feedback
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Solution Overview
Problem
Existing motor vehicle control systems fail to effectively control the slip phase of the friction clutch, leading to inconsistent torque transmission between the engine crankshaft and the primary shaft of a semiautomatic gearbox, which affects synchronization and comfort during gear changes.
Innovation Solution
A control system that detects and processes state variables such as angular velocities and torques, using filtering and processing means to calculate and modulate torque contributions, ensuring controlled torque transmission through the friction clutch, with low-pass filtering and phase advance networks to improve accuracy and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If friction clutch is used to transmit torque during gear changes, then gear shifting is enabled in semiautomatic gearbox, but torque transmission becomes inconsistent and synchronization is affected
Solution Approach 1:
The control system continuously monitors the angular velocity difference between engine crankshaft and gearbox primary shaft, and adjusts the friction clutch torque in real-time based on this feedback to maintain synchronization and consistent torque transmission during gear changes
Solution Approach 2:
The system dynamically changes the torque transmission parameter of the friction clutch during the gear change process, transitioning from full torque transmission to controlled slip phase with modulated torque, and finally to full synchronization, thereby enabling reliable gear shifting
2Measurement precision
If friction clutch torque is modulated during slip phase, then synchronization is improved, but torque oscillations occur
Solution Approach 1:
The control system anticipates torque oscillations during the slip phase and applies damping control in advance, using the filter means to smooth out torque variations before they propagate through the transmission system, thereby maintaining both synchronization accuracy and torque stability
3Measurement precision
If control system processes multiple state variables with filtering, then torque control precision is improved, but system complexity increases
Solution Approach 1:
The control system segments the torque control function into distinct processing stages: detection of state variables, filtering of angular velocity signals, calculation of torque contributions, and final torque synthesis. This segmentation allows precise control while managing complexity through modular functional blocks
Data Source
AI summary
The control system comprisesdetectors or estimators capable of supplying electrical signals or data indicative of the values of predetermined state variables including the angular velocity of the crankshaft of the engine, the difference between this angular velocity and the angular velocity of the primary shaft of the gearbox, and the torque delivered by the engine crankshaft and the torque transmitted by the friction clutch;calculating devices capable of supplying signals indicating the errors between the values of the state variables and respective reference values;filter devices capable of incrementing, within a predetermined frequency band, the relative weight selectively of the error of angular velocity of the crankshaft of the engine, and of the error of the abovementioned difference of angular velocity;processing devices capable of generating, in accordance with predetermined transfer functions, output signals or data indicating a torque partial value or contribution to be delivered by the engine and a torque partial value or contribution to be transmitted to the primary shaft of the gearbox by the friction clutch; andan adder capable of adding the torque partial values or contributions to corresponding other torque partial values or contributions, to be delivered or transmitted as relevant, determined by predetermined methods, in order to supply in the total output signals or data indicating the torque to be generated in the engine crankshaft and signals or data indicating the torque to be transmitted by the friction clutch.