Servo-Controlled Gearbox Driving-Away Control System
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Solution Overview
Problem
Existing control systems for servo-controlled gearboxes struggle to accurately replicate the driver's intended performance during a driving-away maneuver, particularly in terms of comfort and performance, as they fail to effectively manage the engagement of the clutch and transmission ratios.
Innovation Solution
A control system that utilizes a torque reference generator module, engine speed estimator module, and controller module to calculate and adjust reference torques and angular velocities based on driver input, ensuring a smooth and controlled driving-away process by managing the friction clutch and engine torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional control system is used for the servo-controlled gearbox, then the basic gear change operations can be performed, but the system fails to accurately replicate the driver's intended performance during driving-away maneuvers
Solution Approach 1:
The control system continuously monitors the position of the accelerator pedal and uses this feedback to adjust the clutch engagement and transmission ratio selection in real-time, ensuring the vehicle's response matches the driver's intentions during driving-away maneuvers
Solution Approach 2:
The system pre-calculates the optimal clutch engagement profile and transmission ratio sequence based on the detected accelerator pedal position before the driving-away maneuver begins, allowing smooth and accurate replication of driver intent from the start of the maneuver
2Ease of operation
If the clutch engagement is controlled to improve comfort, then the driving experience becomes smoother, but the time required for the driving-away maneuver increases
Solution Approach 1:
The clutch engagement control dynamically adjusts the engagement rate based on the detected driver intent from accelerator pedal position, allowing faster engagement when performance is prioritized and smoother engagement when comfort is prioritized, optimizing both comfort and time efficiency
Solution Approach 2:
The system changes the clutch engagement parameters (engagement rate, torque transfer profile) based on the detected accelerator pedal position, enabling adaptive control that balances comfort and maneuver time according to driver intent
3Adaptability or versatility
If the control system adapts to performance levels specified by the driver, then the driving experience matches driver expectations, but the complexity of the control system increases
Solution Approach 1:
The control system uses a single integrated controller that handles multiple functions including clutch engagement control, transmission ratio selection, and performance adaptation based on accelerator pedal position, reducing overall system complexity while maintaining high adaptability
Solution Approach 2:
The patent combines the detection of driver intent, calculation of optimal engagement profiles, and execution of clutch and transmission control into a unified control system, simplifying the architecture while enabling sophisticated adaptation to driver performance preferences
Data Source
AI summary
What is described is a control system for controlling the driving-away maneuver in a motor vehicle provided with a gearbox comprising a primary input shaft which can be coupled to a drive shaft of a propulsion system of the vehicle by means of a servo-assisted friction clutch, wherein a control unit receives at its input signals indicating a command imparted by the driver of the motor vehicle by operating the accelerator pedal, and generates—on the basis of a mathematical reference model—reference torque request signals indicating the reference torques requested from the drive shaft and from the friction clutch during the driving-away manoeuvre, and also generates—by comparison between signals indicating the estimated angular velocities of the drive shaft and of the primary gear shaft, and detected signals indicating the actual angular velocities of the drive shaft and of the primary gear shaft—corresponding corrective contributions, in such a way as to construct command signals for controlling torque actuator devices of the propulsion system and of the friction clutch, for controlling the driving-away manoeuvre in the motor vehicle.