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Systems and methods for operating fuel system responsive to inferred fuel temperature

A fuel temperature and fuel technology, applied in the direction of charging system, fuel injection device, fuel injection control, etc., can solve the problems of inaccuracy, inaccuracy, sacrifice of fuel economy, etc., and achieve the effect of reducing fuel consumption

Pending Publication Date: 2019-10-01
FORD GLOBAL TECH LLC
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  • Description
  • Claims
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Problems solved by technology

Therefore, Barra's model may be unreliable and inaccurate due to accumulated measurement errors and inherent uncertainties in empirical parameters, especially when engine operation spans a wide range of operating conditions and empirical models tend to fail
Furthermore, in response to these types of conventional fuel temperature estimation models (which exhibit significant inaccuracies), the estimate of fuel temperature is conservatively higher than the actual fuel temperature
Higher fuel temperature is estimated to result in higher fuel injection pressure to maintain engine performance at the expense of fuel economy

Method used

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  • Systems and methods for operating fuel system responsive to inferred fuel temperature
  • Systems and methods for operating fuel system responsive to inferred fuel temperature
  • Systems and methods for operating fuel system responsive to inferred fuel temperature

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Embodiment Construction

[0016] The following detailed description provides information regarding systems and methods for inferring fuel system fuel temperature from a rate of change of fuel pressure and operation of the fuel system in response thereto. exist figure 1 A simplified schematic of an example direct injection fuel system and engine is shown in , while figure 2 show figure 1 Detailed drawing of a direct injection fuel pump and associated components. image 3 A diagram is shown between two different control schemes for input current to the lift fuel pump and the operation of the fuel lift pump at Figure 4 exemplifies. Figure 5 to Figure 6 Fuel pressure is shown for various engine and fuel system conditions, including how fuel pressure stiffness may inform fuel system check valve diagnostics. exist Figure 7 and Figure 9 Inferring fuel temperature based on fuel pressure rate of change and operating in response to it is shown in figure 1 approach to the fuel system. Figure 8 and ...

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Abstract

Systems and methods for operating a fuel system responsive to inferred fuel temperature are provided. Methods and systems are provided for an engine to infer fuel temperature from a measured rate of change in a pressure of a fuel passage between a low pressure fuel pump and a high pressure fuel pump during certain operating conditions, including when the low pressure fuel pump is switched off. Theoperation of the low pressure fuel pump may be adjusted responsively to a change in the inferred fuel temperature.

Description

technical field [0001] The present application generally relates to a control scheme for a lift fuel pump of an internal combustion engine based on fuel temperature inferred from the rate of change of pressure in a fuel passage. Background technique [0002] Some vehicle engine systems utilizing direct in-cylinder fuel injection include a fuel delivery system having multiple fuel pumps for providing the proper fuel pressure to the fuel injectors. This type of fuel system, gasoline direct injection (GDI), is used to increase the power efficiency and range of fuel that can be delivered to the cylinders. GDI fuel injectors may require high pressure fuel for injection to produce enhanced atomization for more efficient combustion. As an example, a GDI system may utilize an electrically driven low pressure pump (e.g., a fuel lift pump) and a mechanically driven high pressure pump (e.g., a direct injection pump) arranged in series along the fuel passage between the fuel tank and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D7/00
CPCF02D7/00F02D41/3082F02D41/3094F02D19/084F02D19/087F02D29/02F02D41/123F02D41/3845F02D41/3854F02D2200/0602F02D2200/0608Y02T10/30F02D19/0684F02D19/0689F02D19/0692F02D41/3872F02D2200/0606F02D2200/0611F02M63/0285F02M65/00
Inventor 约瑟夫·乌雷罗斯·普西福尔
Owner FORD GLOBAL TECH LLC
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