Turbocharged Engine Torque Control During Upshift
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Solution Overview
Problem
In internal combustion engines with turbochargers and stepped automatic transmissions, torque down control via ignition timing retard during upshifts can lead to increased supercharging pressure, causing decreased acceleration response when the waste gate valve is closed, as the excessive torque is not adequately managed.
Innovation Solution
A control method that judges the upshift and performs a first torque down control by ignition timing retard, and if a predicted excessive torque is detected, a second torque down control is initiated to prevent excessive torque without increasing the waste gate valve opening, thereby maintaining rapid supercharging pressure increase and improved acceleration response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the opening degree of the waste gate valve is increased during upshift to reduce supercharging pressure increase, then the torque down control effectiveness is improved, but the acceleration response is decreased when the driver requests acceleration immediately after upshift
Solution Approach 1:
The control device predicts the torque at the end of upshift in advance and performs the second torque down control by ignition timing retard before the upshift completes. This preliminary action prevents excessive torque generation and supercharging pressure increase before they occur, eliminating the need to open the waste gate valve during upshift, thereby maintaining rapid acceleration response when the driver requests acceleration immediately after upshift
Solution Approach 2:
The control device uses feedback from torque prediction based on driving conditions to dynamically adjust the ignition timing retard amount. By continuously monitoring whether the predicted torque exceeds the target torque and adjusting the torque down control accordingly, the system maintains optimal supercharging pressure control without compromising acceleration response
2Force
If ignition timing retard is performed during upshift to reduce torque, then the torque down control is achieved, but the exhaust gas temperature increases causing supercharging pressure to increase
Solution Approach 1:
The control device performs a second torque down control by ignition timing retard after the first torque down control during upshift. This preliminary action anticipates and prevents the excessive torque and supercharging pressure increase that would result from the first torque down control, eliminating the need to open the waste gate valve and maintaining acceleration response
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 approach effectively suppresses excessive torque without increasing the waste gate valve opening, ensuring rapid supercharging pressure increase and improved acceleration response after upshifts.
Implementation Method 1
An exhaust gas temperature of the internal combustion engine becomes high in accordance with the ignition timing retard
Implementation Method 2
a supercharging pressure sensor 18 configured to sense an outlet pressure (that is, a supercharging pressure) of the compressor 12A
Data Source
AI summary
A control method is provided for an internal combustion engine which includes a turbocharger, and which is connected to a stepped automatic transmission. The control method includes judging whether or not an upshift of the automatic transmission is performed; performing a first torque down control by an ignition timing retard of the internal combustion engine during the upshift; judging whether or not a predicted torque estimated from a driving condition of the internal combustion engine is greater than a target torque at an end of the upshift; and performing a second torque down control by the ignition timing retard of the internal combustion engine when the predicted torque is greater than the target torque.