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Systems and methods for fuel injection

A technology of fuel pumps and injectors, which is applied in the direction of fuel injection pumps, fuel injection devices, fuel injection control, etc., and can solve problems such as aggravation

Active Publication Date: 2020-04-14
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem can be exacerbated when fuel injectors are operated at higher fuel flow rates

Method used

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  • Systems and methods for fuel injection
  • Systems and methods for fuel injection
  • Systems and methods for fuel injection

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example 200

[0097] similar to figure 2 Referring to the first embodiment 200 of the fuel system, the third embodiment 300 of the fuel system also includes a first pressure relief valve 246 that is biasable to regulate the pressure in the step chamber 226 of the DI pump 314 . However, the pressure relief setting of the first pressure relief valve 246 may be different and different than the pressure relief setting of the second pressure relief valve 326 . In one example, the pressure relief setting of the first pressure relief valve 246 may be 5 bar and the pressure relief setting of the second pressure relief valve 326 may be 10 bar. In another example, the pressure relief setting of the first pressure relief valve 246 may be 8 bar and the pressure relief setting of the second pressure relief valve 326 may be 15 bar. Other pressure relief arrangements are possible without departing from the scope of the present application. For example, the pressure relief setting of the first pressure ...

no. 5 example 1000

[0140] The fifth embodiment 1000 includes a second fuel rail 1050 fluidly connected to each of the HPP 1014 and the LPP 212 . In the example shown, the second fuel rail 1050 may be a port injector fuel rail 1050 that supplies fuel to a plurality of port injectors 1052 . Thus, fuel may be provided to cylinders of engine 1010 via port injectors as well as direct injectors. Accordingly, engine 1010 may be a PFDI engine.

[0141] Controller 202 may independently drive each of port injectors 1052 via second injection driver 1006 . The controller 202, the second injection driver 1006, the first injection driver 206, and other suitable engine system controllers may comprise a control system. Although the second jetting driver 1006 is shown as being external to the controller 202 , it should be understood that in other examples the controller 202 may include the second jetting driver 1006 or may be configured to provide the functionality of the second jetting driver 1006 . Controll...

no. 8 example 1400

[0181] The eighth embodiment 1400 includes supplying fuel to the PFI rail 1050 through both sides of the pump piston 220 in the DI pump 1414, pressurizing the stepper chamber and compression chamber through one or more pressure relief valves, and supplying fuel to the stepper chamber through the compression chamber 238. Cavity 1426 provides a combination of fuels. In the eighth embodiment 1400 , the stepping chamber 1426 can be fluidly connected to the compression chamber 238 in the DI pump 1414 . Accordingly, additional check valves and pressure relief valves may be included that may not be included in previous embodiments.

[0182] Each of the step chamber 1426 and the PFI rail 1050 may receive fuel from the compression chamber 238 of the DI pump 1414 during the compression stroke when the SACV 236 is in the pass-through mode. Reverse flow fuel from the compression cavity may exit back through SACV 236 along pump passage 254 to node 1466 . At node 1466 , reverse flow fuel ...

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Abstract

The present invention provides methods and systems for delivering fuel to a port injector fuel rail in a port fuel direct injection (PFDI) engine. In one example, a port injector fuel rail may receive fuel from each of a compression chamber and a stepper chamber of a direct injection fuel pump coupled in a PFDI engine. In this way, pressurized fuel may be supplied to the port injector fuel rail during an entire cycle of the direct injection fuel pump.

Description

【Technical field】 [0001] The present application generally relates to systems and methods for operating fuel pumps, particularly direct injection fuel pumps. 【Background technique】 [0002] Port fuel direct injection (PFDI) engines include both port and direct injection of fuel and may advantageously utilize each injection mode. For example, at higher engine loads, direct fuel injection may be used to inject fuel into the engine for improving engine performance (eg, by increasing available torque and fuel economy). At lower engine loads and during engine starting, port fuel injection may be used to inject fuel into the engine to provide improved fuel vaporization for enhanced mixing and reduced engine emissions. Further, port fuel injection may provide improved fuel economy relative to direct injection at lower engine loads. Still further, noise, vibration and harshness (NVH) may be reduced when operating with port fuel injection. Additionally, both port injectors and dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M63/02F02M59/02F02M59/10F02D41/30
CPCF02D41/3094F02M59/02F02M59/102F02M59/466F02M63/02F02D41/3854F02D41/3863F02M63/029F02M59/366F02D41/3082F02D2041/3881F02M55/025F02M59/464F02D2041/389
Inventor R·D·珀西富尔G·苏妮拉J·F·巴斯马纪M·梅恩哈特张颢
Owner FORD GLOBAL TECH LLC
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