Fuel Delivery Pump Speed Control via Sensor-Free Calculation
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Solution Overview
Problem
Existing fuel delivery systems for internal combustion engines face challenges in achieving optimal regulation speed and quality, particularly when using sensor-free pressure detection, which results in delayed pressure change detection and increased susceptibility to disturbances.
Innovation Solution
A method that regulates the fuel delivery system by defining target rotational speed limits for the electric motor driving the fuel delivery pump, using a pressure-sensor-free calculation method based on characteristic diagrams relating rotational speed, pressure, and fuel volume, with upper and lower limits set according to maximum and minimum fuel requirements, ensuring accurate fuel delivery without sensor-based monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensor-free pressure detection is used in the fuel delivery system, then device complexity is reduced, but measurement precision deteriorates due to delayed pressure change detection and higher susceptibility to disturbances
Solution Approach 1:
The patent introduces an intermediary calculation method that uses the relationship between rotational speed, pressure, and fuel volume through characteristic diagrams. Instead of directly measuring pressure with a sensor, the system calculates pressure based on measurable parameters (rotational speed and fuel volume) using pre-established characteristic relationships, thereby avoiding the need for a pressure sensor while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces the mechanical/physical pressure sensing system with a calculation-based approach. By substituting the pressure sensor with a computational model that uses characteristic diagrams relating rotational speed, pressure, and fuel volume, the system eliminates the need for complex sensing hardware while achieving equivalent or superior measurement precision.
2Manufacturing precision
If rotational speed limits are predefined based on fuel requirements, then manufacturing precision is improved through accurate fuel delivery control, but device complexity increases due to the calculation method and limit definitions
Solution Approach 1:
The patent applies preliminary action by pre-defining rotational speed limits and characteristic diagrams during the design phase. The relationships between rotational speed, pressure, and fuel volume are established in advance through characteristic diagrams, allowing the control system to simply query pre-calculated values rather than performing complex real-time calculations, thus achieving high precision with minimal runtime complexity.
Solution Approach 2:
The patent implements dynamic rotational speed limits that adapt to varying fuel requirements. Instead of fixed limits, the system dynamically adjusts the rotational speed boundaries based on the current fuel demand and characteristic diagrams, enabling precise fuel delivery control across different operating conditions while maintaining manageable system complexity through the use of pre-established relationships.
Data Source
AI summary
A method for regulating a fuel delivery system of an internal combustion engine in a motor vehicle having a fuel delivery pump for supplying the internal combustion engine with fuel, the fuel delivery pump having a pump mechanism driveable by an electric motor actuable by a control signal, and a pressure-sensor-free pressure monitor being provided in the fuel delivery system, includes: predefining a target rotational speed for the electric motor based on the control signal; predefining an upper rotational speed limit and/or a lower rotational speed limit for the target rotational speed, wherein the upper rotational speed limit depends on the maximum fuel requirement of the internal combustion engine, and the lower rotational speed limit depends on the minimum fuel requirement of the internal combustion engine; and determining the target rotational speed by a pressure-sensor-free calculation method.