Vehicle Control Device Torque Recovery Suppression
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Solution Overview
Problem
Existing vehicle control systems may experience unexpected torque increase and deterioration in traveling performance due to the overlap of ignition timing retardation termination and air bypass valve closure during transmission upshift.
Innovation Solution
Implementing a vehicle control method that separates the termination of ignition timing retardation and the closure of the recirculation valve, ensuring these events occur at different timings in response to transmission upshift completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air bypass valve is opened to lower boost pressure during ignition timing retardation, then thermal energy of exhaust gas is reduced and turbine work is controlled, but torque recovery increases more than expected and vehicle acceleration deteriorates when the valve closes at the same timing as retardation termination
Solution Approach 1:
The recirculation valve is closed at a timing earlier than the termination of ignition timing retardation. This preliminary closure prevents the valve from being closed simultaneously with retardation termination, thereby avoiding the sudden torque increase and vehicle acceleration that would otherwise occur.
Solution Approach 2:
By closing the recirculation valve before terminating the ignition timing retardation, the system preemptively counteracts the potential harmful effect of simultaneous closure and retardation termination. This timing separation prevents the unexpected torque recovery that would deteriorate vehicle acceleration performance.
2Loss of time
If the recirculation valve is closed simultaneously with termination of ignition timing retardation, then the system responds efficiently to upshift completion, but torque recovery increases excessively and traveling performance deteriorates
Solution Approach 1:
The recirculation valve is closed at a timing earlier than the termination of ignition timing retardation. This preliminary closure prevents the valve from being closed simultaneously with retardation termination, thereby avoiding the sudden torque increase and vehicle acceleration that would otherwise occur.
Solution Approach 2:
The system dynamically adjusts the closure timing of the recirculation valve relative to the termination of ignition timing retardation. By making the closure timing flexible and separating it from the retardation termination timing, the system optimizes both response efficiency and torque control to maintain traveling performance.
Data Source
AI summary
When a vehicle accelerates due to an upshifting of a transmission, a recirculation valve is opened and ignition period is retarded so that the torque generated in an internal combustion engine decreases. When upshifting of the transmission of the vehicle is completed, retarding of the ignition period is ended and the recirculation valve is closed at different timings. As a result, the amount of torque recovery at the end of the upshifting of the transmission of the vehicle can be prevented from increasing more than expected, and the acceleration rate after the shift can be reduced.