Vehicle Launch Control Using Sensor-Based Torque Feedback
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Solution Overview
Problem
Existing methods for controlling the launch of vehicles equipped with dual clutch transmission (DCT) or automated manual transmission (AMT) face challenges in accurately controlling clutch torque and engine torque, leading to jerking, shock, or stall, especially on uphill roads, which affects launch performance and clutch durability.
Innovation Solution
A method involving a controller that sets a target engine speed based on the accelerator pedal operation, performs transient control, determines correction amounts using measured engine speed differences, and applies feedback control to adjust clutch torque, incorporating a forgetting factor to adapt to changing conditions, ensuring smooth launch and reduced clutch heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If feedback control is performed based on estimated engine torque and clutch torque values from maps, then launch control can be implemented, but the control accuracy deteriorates due to torque estimation errors
Solution Approach 1:
The patent replaces the map-based estimation method with a sensor-based measurement system. Specifically, it uses an engine torque sensor to directly measure engine torque and a clutch torque sensor to directly measure clutch torque, substituting the indirect estimation approach with direct physical measurement to eliminate accuracy errors.
Solution Approach 2:
The patent introduces sensor-based measurement systems as intermediaries between the physical quantities (torque, speed) and the control system. These sensors act as mediators that provide accurate real-time data to the controller, enabling precise feedback control without relying on map-based estimations.
2Power
If clutch torque is increased to improve launch performance on uphill roads, then vehicle acceleration improves, but clutch durability deteriorates due to excessive slip and heat generation
Solution Approach 1:
The patent implements feedback control by continuously measuring actual engine torque and clutch torque with sensors, comparing them with target values, and adjusting the clutch actuator in real-time. This closed-loop feedback system enables precise control of clutch slip, preventing excessive heat generation while maintaining sufficient acceleration power on uphill roads.
Solution Approach 2:
The patent dynamically adjusts clutch torque based on real-time operating conditions using sensor feedback. The controller continuously modifies clutch actuator output according to actual engine torque measurements and vehicle state, enabling adaptive control that optimizes the balance between acceleration performance and clutch protection under varying load conditions.
Data Source
AI summary
A method of controlling launch of a vehicle, may include setting step in which a controller sets a basic target engine speed; a transient control step in which the controller controls a clutch torque based on the basic target engine speed; a transient state determining step in which the controller determines, whether a transition period of change of the engine speed elapsed; a first correction amount determination step in which the controller determines a correction amount; a correction applying step in which the controller adds the correction amount to the predetermined target engine speed and then determines a final target engine speed; an error determination step in which the controller determines the engine speed control error; and a feedback determination step in which the controller uses the engine speed control error and determines a feedback control amount for feedback-controlling a clutch actuator.