Fuel Pump Pressure Controller Duty Ratio Control
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Solution Overview
Problem
Current fuel-supply systems face challenges in controlling fuel pressure effectively during the initial 'wait' and 'delay' period after engine ignition, leading to potential overshooting of target fuel pressure and increased power consumption due to maximum voltage settings.
Innovation Solution
The fuel-supply system incorporates a pressure controller that adjusts the voltage applied to the fuel pump motor using a provisional target fuel pressure value, which is either the previous target value before ignition or the value received after ignition, to prevent overshooting and reduce power consumption by setting the motor duty ratio to a set value based on elapsed time or pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor duty ratio is set to maximum value during the wait period after ignition, then the engine can be activated more easily, but the fuel pressure may overshoot the target value and power consumption increases
Solution Approach 1:
The system performs preliminary action by setting the motor duty ratio to a predetermined value (not maximum) during the wait period before the target fuel pressure value is received. This preliminary control setting prevents overshooting while ensuring the engine can still be activated reliably, and reduces power consumption compared to maximum duty ratio operation.
2Speed
If the motor duty ratio is set to maximum value during the wait period, then the fuel pressure reaches target quickly, but the system overshoots the desired fuel pressure
Solution Approach 1:
The system applies preliminary action by pre-setting the motor duty ratio to a predetermined value during the wait period before target fuel pressure information is available. This predetermined value is carefully selected to achieve adequate fuel pressure response while preventing overshooting, thus balancing response speed and control precision.
Solution Approach 2:
The system applies preliminary anti-action by setting the motor duty ratio to a limited value rather than maximum during the wait period. This preliminary constraint prevents the harmful effect of overshooting before it can occur, while still maintaining sufficient fuel pressure buildup to ensure reliable engine activation.
3Reliability
If feedback control is not available during the wait period, then the system cannot adjust fuel pressure dynamically, but the engine must still be activated reliably
Solution Approach 1:
The system performs preliminary action by pre-configuring the motor duty ratio to a predetermined value during the wait period when feedback control is not yet available. This preliminary setting ensures reliable engine activation without requiring complex real-time control algorithms during the initial period.
Solution Approach 2:
The system applies self-service by using a predetermined motor duty ratio setting that automatically provides appropriate fuel pressure during the wait period without requiring external feedback or complex control decisions. Once feedback becomes available, the system transitions to feedback-based control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach inhibits potential overshooting of fuel pressure and reduces power consumption by allowing the system to adjust the motor duty ratio dynamically, ensuring stable fuel pressure control and efficient energy use.
Implementation Method 1
A motor may drive and/or operate the fuel pump to supply, i.e. by pressure-feeding, fuel stored within a fuel tank to an engine
Implementation Method 2
The pressure controller may control fuel pressure upon receiving feedback from the fuel system, i.e. referred to in the art as 'feedback control.' Such feedback control adjusts the fuel pump as necessary to ensure that an actual and/or observed fuel pressure approaches a target and/or ideal fuel pressure value
Data Source
AI summary
A fuel-supply system has a fuel pump, a pressure controller, a signal output device and a power switch. The pressure controller adjusts the observed fuel pressure of the fuel and may electronically communicate with a motor driving the fuel pump to regulate the supply of fuel from a fuel tank of the fuel-supply system to an engine. In detail, the pressure controller performs feedback control of a voltage applied to the motor such that the pressure of a fuel pumped from the fuel pump approaches to have a first target and/or ideal fuel pressure value. Further, the signal output device outputs the first target fuel pressure value to the pressure controller. Activation of the power switch supplies power, from a power source, to the pressure controller, the motor and the signal output device. Further, the pressure controller may perform feedback control based on a second target fuel pressure value.