Fuel Delivery Control System Driveline Disturbance Reduction
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Solution Overview
Problem
Traditional fuel delivery systems in vehicles experience driveline disturbances and degraded drivability due to rapid intervals of fuel deactivation and reactivation during short periods of deceleration and acceleration, leading to suboptimal fuel economy and performance.
Innovation Solution
A fuel delivery control system that uses a control module to calculate and implement delay periods and window periods based on vehicle speed and engine rotational speed signals to manage fuel delivery deactivation, preventing immediate reactivation after deceleration and ensuring optimal thermal conditions, thereby reducing driveline disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fuel delivery is deactivated during vehicle deceleration to improve fuel economy, then fuel consumption is reduced, but drivability is degraded due to driveline disturbances from rapid fuel deactivation and reactivation cycles
Solution Approach 1:
The control module implements a delay period before deactivating fuel delivery after detecting deceleration conditions, and a window period during which fuel delivery remains deactivated even if acceleration conditions briefly occur. This preliminary timing action prevents rapid on-off cycling of fuel delivery, smoothing out the transitions that cause driveline disturbances while still achieving fuel economy improvements during sustained deceleration.
2Loss of energy
If fuel delivery is deactivated immediately after transmission up-shift to improve fuel economy, then fuel consumption is reduced, but driveline disturbance increases causing degraded drivability
Solution Approach 1:
The control module calculates a delay period that accounts for transmission shift timing, ensuring fuel delivery deactivation occurs only after the transmission shift is complete and the vehicle has entered a stable deceleration phase. This preliminary timing prevents the harmful combination of transmission up-shift followed by immediate fuel deactivation and down-shift, eliminating the associated driveline disturbances.
Data Source
AI summary
A fuel delivery control system includes a vehicle speed sensor that generates a vehicle speed signal and an engine rotational speed sensor that generates an engine rotational speed signal. A control module calculates at least one of an accelerator release delay period and a brake depression delay period based on the vehicle speed signal and the engine rotational speed signal and deactivates fuel delivery to said engine after waiting at least one of the accelerator release delay period after the accelerator pedal is released and the brake depression delay period after the brake pedal is depressed.