FUEL DELIVERY SYSTEM CONTROLS INCLUDING FUEL FEED RATE SHAPE DETERMINATION

Abstract

A process for operating a computing system in operative communication with a fuel delivery system includes receiving a fuel delivery command including a specified fuel quantity and a specified fuel pressure, determining a first fuel delivery rate shape that corresponds to the specified fuel pressure but does not correspond to the specified fuel quantity, determining a second fuel delivery rate shape that corresponds to the specified fuel quantity and the specified fuel pressure at least in part by modifying the first fuel delivery rate shape by repositioning a pre-maximum fuel delivery portion of the first fuel delivery rate shape relative to a post-maximum fuel delivery portion of the first fuel delivery rate shape,updating a fuel meter control model based on the second fuel delivery rate shape and at least one of controlling and diagnosing a fuel meter of the fuel delivery system using the updated fuel meter control model.

Claims

[1] A process for operating a computing system in operative communication with a fuel supply system, including the process comprising: Receiving a fuel delivery command including a specified fuel quantity and a specified fuel pressure; determining a first fuel delivery rate shape corresponding to the specified fuel pressure but not the specified fuel quantity; Determining a second fueling rate shape that corresponds to the specified fuel amount and the specified fuel pressure at least in part by modifying the first fueling rate shape by repositioning a pre-maximum fueling portion of the first fueling rate shape relative to a post-maximum fueling portion of the first fueling rate shape; Updating a fuel meter control model based on the second fuel delivery rate shape; and at least one of controlling and diagnosing a fuel meter of the fuel delivery system using the updated fuel meter control model. [2] The process of claim 1, wherein determining the first fueling rate shape of the fueling rate comprises interpolating between a first predetermined fueling rate shape for a predetermined fuel amount different from the specified fuel amount and a first predetermined pressure different from the specified fuel pressure, and a second predetermined fueling rate shape for the predetermined fuel amount and a second predetermined pressure different from the specified fuel pressure. [3] The process of claim 2, wherein the predetermined amount of fuel is a maximum amount of fuel, the first predetermined pressure is a maximum pressure, and the second predetermined pressure is a minimum pressure. [4] The process of claim 1, wherein determining the second fueling rate shape further comprises: Evaluating a difference between the specified fuel quantity and the fuel quantity of the modified first fueling rate shape, wherein the post-maximum fueling portion is repositioned relative to the pre-maximum fueling portion; and if the difference is greater than a difference criterion, modifying the post-maximum fueling section to reduce the difference. [5] The process of claim 4, wherein the evaluating comprises integrating a range of the modified first fueling rate shape and calculating the difference between the integrated range and the specified fuel amount. [6] The process of claim 4, comprising repeating the evaluating and modifying until the difference is not greater than the difference criterion. [7] Process according to any one of claims 1-6, wherein the fuel supply command comprises a fuel injection command, the specified fuel quantity includes a specified injection quantity, the specified fuel pressure includes a specified injection pressure, the first fuel supply rate shape comprises a first injection rate shape, the second fuel supply rate shape comprises a second injection rate shape, the fuel meter control model includes a fuel injector control model, the fuel measuring device comprises a fuel injection nozzle, the post-maximum fuel supply section of the first fuel supply rate shape comprises an injector closing section of the first fuel supply rate shape and the premaximum fuel supply portion of the first fuel supply rate shape comprises an injector opening portion of the first fuel supply rate shape. [8] The process of claim 7, wherein the at least one of controlling and diagnosing a fuel meter of the fuel delivery system using the updated fuel meter control model comprises determining an injector duty cycle to provide the specified amount of fuel and controlling a fuel injector in response to the injector duty cycle. [9] Process according to any one of claims 1-6, wherein the fuel supply command includes a fuel pumping command, the specified fuel quantity includes a specified pumping quantity, the specified fuel pressure includes a specified pumping pressure, the first fuel supply rate shape comprises a first pumping rate shape, the second fuel supply rate form comprises a second pumping rate form, the fuel meter control model includes a fuel pump control model, the fuel measuring device comprises a fuel pump, the post-maximum fuel supply section of the first fuel supply rate form comprises a pump closing section of the first fuel supply rate form and the post-maximum fueling portion of the first fueling rate shape comprises a pump orifice portion of the first fueling rate shape. [10] The process of claim 7, wherein the at least one of controlling and diagnosing a fuel meter of the fuel delivery system using the updated fuel meter control model comprises determining a pumping start time to provide the specified amount of fuel and controlling a fuel pump in response to the pumping start time. [11] System comprising: a fuel supply system; and an electronic control system in operative communication with the fuel supply system and configured to: Receiving a fuel supply command including a specified fuel quantity and a specified fuel pressure; determining a first fuel delivery rate shape corresponding to the specified fuel pressure but not the specified fuel quantity; Determining a second fueling rate shape that corresponds to the specified fuel amount and the specified fuel pressure at least in part by modifying the first fueling rate shape by repositioning a pre-maximum fueling portion of the first fueling rate shape relative to a post-maximum fueling portion of the first fueling rate shape; Updating a fuel meter control model based on the second fuel delivery rate shape; and one or both of controlling and diagnosing a fuel meter of the fuel delivery system using the updated fuel meter control model. [12] The system of claim 11, wherein the electronic control system configured to determine the first fueling rate shape comprises the electronic control system configured to interpolate between a first predetermined fueling rate shape for a predetermined amount of fuel different from the specified amount of fuel and a first predetermined pressure different from the specified fuel pressure, and a second predetermined fueling rate shape for the predetermined amount of fuel and a second predetermined pressure different from the specified fuel pressure. [13] The system of claim 12, wherein the predetermined amount of fuel is a maximum amount of fuel, the first predetermined pressure is a maximum pressure, and the second predetermined pressure is a minimum pressure. [14] The system of claim 11, wherein the electronic control system configured to determine the second fuel delivery rate shape comprises the electronic control system configured to: Evaluating a difference between the specified fuel quantity and the fuel quantity of the modified first fueling rate shape, wherein the post-maximum fueling portion is repositioned relative to the pre-maximum fueling portion; and if the difference is greater than a difference criterion, modifying the post-maximum fueling section to reduce the difference. [15] The system of claim 14, wherein the electronic control system configured to evaluate the difference comprises the electronic control system configured to integrate a range of the modified first fueling rate shape and calculate the difference between the integrated range and the specified fuel amount. [16] The system of claim 14, wherein the electronic control system is configured to repeatedly evaluate the difference and modify the post-maximum fueling closing portion until the difference is not greater than the difference criterion. [17] System according to any one of claims 11-16, wherein the fuel supply command comprises a fuel injection command, the specified fuel quantity includes a specified injection quantity, the specified fuel pressure includes a specified injection pressure, the first fuel supply rate shape comprises a first injection rate shape, the second fuel supply rate shape comprises a second injection rate shape, the fuel meter control model includes a fuel injector control model, the fuel measuring device comprises a fuel injection nozzle, the post-maximum fuel supply section of the first fuel supply rate shape comprises an injector closing section of the first fuel supply rate shape and the premaximum fuel supply portion of the first fuel supply rate shape comprises an injector opening portion of the first fuel supply rate shape. [18] The system of claim 17, wherein the electronic control system is configured to do one or both of controlling and / or diagnosing the fuel meter of the fuel delivery system using the updated fuel meter control model, comprising the electronic control system configured to determine an injector duty cycle to provide the specified amount of fuel and to control a fuel injector in response to the injector duty cycle. [19] System according to any one of claims 11-16, wherein the fuel supply command includes a fuel pumping command, the specified fuel quantity includes a specified pumping quantity, the specified fuel pressure includes a specified pumping pressure, the first fuel supply rate shape comprises a first pumping rate shape, the second fuel supply rate form comprises a second pumping rate form, the fuel meter control model includes a fuel pump control model, the fuel measuring device comprises a fuel pump, the post-maximum fuel supply section of the first fuel supply rate form comprises a pump closing section of the first fuel supply rate form and the post-maximum fueling portion of the first fueling rate shape comprises a pump orifice portion of the first fueling rate shape. [20] The system of claim 17, wherein the electronic control system is configured to do one or both of controlling and / or diagnosing the fuel meter of the fuel delivery system using the updated fuel meter control model, comprising the electronic control system configured to determine a pumping start time to provide the specified amount of fuel and to control a fuel pump in response to the pumping start time.

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