Fuel Pump Control Device Dynamic Gain Feedback
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Solution Overview
Problem
Conventional fuel pump control systems fail to efficiently adjust fuel discharge in response to varying engine requirements and environmental conditions, leading to suboptimal fuel pressure control and potential stability issues during acceleration and idling states.
Innovation Solution
A fuel pump control device with a control unit that performs feedback control of actual fuel pressure using a gain that dynamically adjusts based on required fuel amount and environmental temperature, with specific gain settings for different operating states, such as idling, accelerating, and constant speed, to ensure quick and stable fuel pressure regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a constant gain is used for feedback control of fuel pressure, then the control system is simple, but the fuel pressure regulation becomes slow and unstable during acceleration and idling states
Solution Approach 1:
The patent applies dynamics by making the gain value changeable based on operating conditions. The control unit dynamically adjusts the gain in the feedback control equation based on whether the engine is in acceleration or idling state, transforming a static control system into a dynamic one that adapts to different operational requirements.
Solution Approach 2:
The patent changes the parameter (gain value) based on environmental conditions and engine state. By detecting acceleration or idling states and adjusting the gain parameter accordingly, the system optimizes fuel pressure regulation performance for different operating scenarios without requiring a completely different control architecture.
2Reliability
If the fuel pump discharges fuel continuously, then fuel pressure is maintained, but fuel efficiency decreases due to unnecessary fuel consumption
Solution Approach 1:
The patent uses feedback control where the control unit continuously monitors the actual fuel pressure and compares it with the target pressure. Based on this feedback, the system adjusts the fuel pump discharge amount dynamically, reducing fuel consumption when pressure is sufficient while maintaining stability when pressure drops.
Solution Approach 2:
The system implements periodic measurement and adjustment of fuel pressure through feedback control, rather than continuous discharge. The fuel pump operates in a controlled manner with periodic adjustments based on pressure sensor feedback, optimizing the balance between pressure maintenance and fuel efficiency.
Data Source
AI summary
A fuel pump controller performs a feedback control of an actual fuel pressure of a feed pump to a command fuel pressure which is from an external element. The pump controller changes a gain for the feedback control to a value larger than a minimum value of the gain in response to an acceleration command information which is to accelerate a vehicle by using an internal combustion engine.