Engine Torque Control for Manual Gearbox Synchronization
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Solution Overview
Problem
Manual gear vehicles experience safety issues and jolts during gear changes due to synchronization oscillations between the engine and clutch, which existing technologies have not adequately addressed.
Innovation Solution
A method for controlling engine torque in manual gear vehicles using an unknown input state observer to estimate clutch torque during engagement phases, ensuring the engine torque remains above a minimum limit, thereby reducing speed variations and jolts by modeling the kinematic chain upstream of the clutch and considering a linear evolution of clutch torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If engine torque is controlled to reduce gearshift time in automatic gearboxes, then gearshift speed is improved, but synchronization oscillations between engine and clutch cause safety issues and jolts
Solution Approach 1:
The patent implements a feedback control system using an unknown input state observer to estimate clutch torque in real-time during gear changes. The observer processes engine speed, clutch speed, and acceleration measurements to reconstruct the clutch torque state, which then feeds back to the torque control system to adjust engine torque and minimize synchronization oscillations, thereby maintaining safety while enabling fast gearshifts.
Solution Approach 2:
The patent dynamically adjusts engine torque parameters during the gear change process based on the estimated clutch torque state. By changing the torque delivery characteristics in real-time according to the synchronization phase, the system achieves rapid gearshifts without compromising safety or causing harmful oscillations.
2Stability of the object's composition
If engine torque is reduced during clutch engagement to minimize speed drop, then synchronization smoothness is improved, but vehicle jolts occur due to insufficient torque compensation
Solution Approach 1:
The patent introduces an unknown input state observer as an intermediary system that indirectly measures clutch torque by observing the kinematic chain upstream of the clutch. This intermediary estimation mechanism enables precise torque control without direct clutch torque sensing, allowing smooth synchronization while compensating for torque drops to prevent vehicle jolts.
3Measurement precision
If clutch torque estimation is implemented using a state observer, then torque control precision is improved, but system complexity increases due to additional modeling requirements
Solution Approach 1:
The patent extracts only the essential dynamic characteristics needed for clutch torque estimation by formulating a simplified unknown input state observer. The observer model focuses specifically on the kinematic chain upstream of the clutch, separating the estimation problem from the complete vehicle dynamics model, thereby achieving accurate torque estimation with reduced computational complexity.
Data Source
Figure 1~2
AI summary
The invention relates to a method for controlling the engine torque of an automotive vehicle equipped with a manual gearbox, characterised in that, during the clutch actuation phases when changing for lower or higher gears, the engine torque ( G e) is determined as a function of the torque ( G c) transmitted by the clutch.