Engine Torque Control Using Hydraulic Pressure for Smooth Shifting
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Solution Overview
Problem
Conventional engine torque control methods during shifting in automatic transmissions face challenges in preventing shift shock and transmission damage due to excessive or insufficient engine torque, relying on trial and error processes that are time-consuming and inefficient.
Innovation Solution
The system controls engine torque based on transmission hydraulic pressure by calculating turbine torque using formulas involving turbine angular acceleration, driving resistance, and coupling solenoid torque, applying hydraulic pressure at the beginning of shifting to determine the required torque and adjust engine torque accordingly, thereby preventing shift shock and transmission damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If engine torque request value is determined through trial and error process by calibration engineer, then shift smoothness can be improved, but development time and efficiency are reduced
Solution Approach 1:
The patent replaces the manual trial-and-error calibration process with an automated calculation system that uses turbine speed difference as input to determine engine torque request values. The controller automatically calculates the required engine torque based on real-time turbine speed data, eliminating the need for repeated manual testing and calibration by engineers.
Solution Approach 2:
The system enables self-adjustment by using real-time turbine speed feedback to automatically determine appropriate engine torque request values. The controller continuously monitors turbine speed difference and autonomously calculates the optimal engine torque without requiring external calibration input, allowing the system to self-optimize shift smoothness.
2Power
If excessive engine torque is applied during shifting, then power transmission efficiency is improved, but shift shock and transmission damage occur
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors turbine speed and uses the turbine speed difference to dynamically adjust engine torque request values. This real-time feedback ensures that engine torque is optimized for power transmission while automatically preventing excessive torque that would cause shift shock or transmission damage.
Solution Approach 2:
The system dynamically adjusts engine torque request values based on real-time turbine speed conditions rather than using fixed torque values. The controller calculates optimal torque requests that adapt to changing operating conditions, maintaining power transmission efficiency while preventing harmful torque levels during the shifting process.
3Ease of operation
If insufficient engine torque is applied during shifting, then shift shock is reduced, but transmission damage may occur due to improper torque management
Solution Approach 1:
The controller uses real-time turbine speed feedback to dynamically determine appropriate engine torque request values. This feedback mechanism ensures that sufficient torque is applied to maintain proper torque management and prevent transmission damage, while simultaneously optimizing shift smoothness through precise torque control based on actual turbine speed conditions.
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 method ensures smooth shifting by optimizing engine torque control, reducing the risk of transmission damage and eliminating the inefficiencies of manual calibration processes, thereby improving shift smoothness and extending transmission lifespan.
Implementation Method 1
the torque converter is a mechanical device positioned between a pump impeller and a turbine, and is used to amplify torque and transmit power between the engine and an automatic transmission by fluid coupling
Implementation Method 2
calculating the turbine torque through a hydraulic pressure reference at the beginning of physical shifting
Data Source
AI summary
A method of controlling engine torque according to transmission hydraulic pressure is performed by an engine torque control system of a vehicle. The method includes connecting an engine torque converter to an engine and an automatic transmission of the vehicle, calculating a required turbine torque after confirming an engine torque control condition, deriving and storing a value of turbine torque factor learning through turbine torque factor learning according to shift type and shift time, converting the stored value of turbine torque factor learning into an engine torque control value, and requesting the engine torque control value to be applied to engine output, by an engine torque controller during shifting of the automatic transmission, so that a new turbine torque calculation is performed through a hydraulic pressure reference at the beginning of physical shifting, thereby preventing a shift shock and transmission damage caused by unreasonably excessive or insufficient engine torque.