Vehicle Control Apparatus Exhaust Temperature-Based Torque Management
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Solution Overview
Problem
The existing control apparatuses for vehicle automatic transmissions face challenges in managing shifting-time torque-down control, particularly when using the ignition retard method, as they may increase harmful gases like HC and CO due to fuel increase control, and the fuel cut method results in poor control accuracy and delayed torque rise upon restart, impacting power performance.
Innovation Solution
A control apparatus that estimates the temperature of the exhaust pipe and switches between ignition retard and fuel cut methods based on predetermined temperature values to minimize fuel increase control and ensure quick torque recovery, using the fuel cut method when temperatures exceed upper-limit values and switching to ignition retard if catalyst temperatures indicate potential deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ignition retard method is used for shifting-time torque-down control, then control accuracy and responsiveness are improved, but exhaust system temperature increases causing harmful gas emissions
Solution Approach 1:
The system changes the control parameter (torque-down method) based on the exhaust temperature parameter. When exhaust temperature is high, it switches from ignition retard method to fuel cut method, and adjusts the throttle valve opening degree to balance control accuracy with temperature management, thereby reducing harmful emissions while maintaining acceptable control performance
Solution Approach 2:
The control system dynamically switches between ignition retard method and fuel cut method based on real-time exhaust temperature conditions. This dynamic adaptation allows the system to optimize between control accuracy and temperature management, preventing harmful emissions during high-temperature conditions while maintaining responsive torque control during normal conditions
2Temperature
If the fuel cut method is used for shifting-time torque-down control, then exhaust system overheating is suppressed, but control accuracy and responsiveness deteriorate
Solution Approach 1:
The throttle valve acts as an intermediary element that compensates for the control accuracy limitations of the fuel cut method. By precisely controlling the throttle valve opening degree during fuel cut operation, the system can indirectly regulate air intake and optimize combustion efficiency, thereby improving overall control accuracy while maintaining the temperature suppression benefits of fuel cut method
Solution Approach 2:
The control system combines multiple functions within the fuel cut method implementation: it not only restricts fuel supply to suppress overheating but also coordinates with electronic throttle valve control to maintain intake air management and combustion optimization, thereby achieving both temperature control and acceptable control accuracy through a unified multi-functional approach
3Object-generated harmful factors
If the fuel cut method is used for shifting-time torque-down control, then harmful gas emissions are reduced, but torque recovery time increases
Solution Approach 1:
The system performs preliminary actions by pre-managing exhaust temperature and oxygen accumulation during the fuel cut period through coordinated throttle valve control. This preparation ensures that when fuel supply is restarted, the engine is in an optimal state for rapid torque recovery, minimizing the time loss despite using the fuel cut method for emission reduction
Data Source
AI summary
A control apparatus for a vehicle that includes a drive wheel, an engine and an automatic transmission configured to transmit power from the engine toward the drive wheel. When the automatic transmission is shifted, the control apparatus is configured to execute a shifting-time torque-down control by using an ignition retard method of retarding an ignition timing of the engine or a fuel cut method of restricting fuel supply to the engine. The control apparatus is configured to estimate a temperature of a predetermined portion of an exhaust pipe of the engine in a case in which the shifting-time torque-down control is executed by using the ignition retard method, and to execute the shifting-time torque-down control by using the fuel cut method when an estimated value of the temperature of the predetermined portion of the exhaust pipe is not lower than a predetermined upper-limit temperature value.