Engine Torque Control by Injector Skipping During Upshifts
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Solution Overview
Problem
Existing vehicle transmission systems face challenges in smoothly managing engine fuel injector and spark plug operations during transmission upshifts, particularly in sport mode or when the accelerator pedal is fully depressed, leading to inefficiencies and potential performance issues.
Innovation Solution
A vehicle controller is programmed to selectively skip one or more fuel injector events during the inertia phase of a transmission upshift, based on the accelerator pedal position and vehicle mode, to reduce engine torque and improve shift smoothness and sportiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fuel injector events are skipped during the inertia phase of transmission upshift in sport mode or when accelerator pedal is fully depressed, then shift smoothness and sportiness are improved, but combustion stability may be affected
Solution Approach 1:
The system dynamically adjusts fuel injection timing and quantity based on real-time transmission state and accelerator pedal position. During upshift inertia phase in sport mode or full throttle conditions, the controller selectively skips or modifies fuel injector events to reduce torque and improve shift smoothness, while monitoring combustion stability parameters to ensure reliable operation.
Solution Approach 2:
The controller changes fuel injection parameters (timing, quantity, or complete skip of injector events) during the transmission upshift inertia phase. By modifying these parameters based on accelerator pedal position and vehicle mode, the system achieves smoother shifts while maintaining combustion stability through controlled parameter adjustments rather than complete fuel cutoff.
2Loss of time
If fuel injector events are skipped during transmission upshift, then shift time is reduced and performance is enhanced, but engine torque control becomes more complex
Solution Approach 1:
The controller is pre-programmed with shift timing strategies that anticipate transmission upshift events. By detecting the inertia phase of upshift and current vehicle mode beforehand, the controller prepares and executes fuel injector skip commands at the optimal moment, reducing shift time while managing complexity through pre-planned control logic.
Solution Approach 2:
The system uses feedback from transmission position sensors, accelerator pedal position sensors, and vehicle mode signals to determine when to skip fuel injector events. This feedback mechanism allows the controller to automatically adjust fuel injection timing based on real-time conditions, reducing shift time while keeping the control logic manageable through sensor-driven decision making.
Data Source
AI summary
A vehicle includes an engine and a transmission coupled to the engine. A vehicle controller is programmed to, in response to a shift of the transmission with the vehicle being in a sport mode or other precondition being present, command the engine to skip one or more fuel injector events of the engine during an inertia phase of the shift.