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Apparatus of estimating fuel injection state

A technology of fuel injection and state, applied in the direction of fuel injection control, fuel injection device, mechanical equipment, etc., can solve problems such as increasing cost, and achieve the effect of improving accuracy

Inactive Publication Date: 2015-04-01
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, such multiple fuel pressure sensors may increase the cost

Method used

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  • Apparatus of estimating fuel injection state
  • Apparatus of estimating fuel injection state
  • Apparatus of estimating fuel injection state

Examples

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no. 1 example

[0033] figure 1 Components of a fuel injection system according to a first embodiment of the present disclosure are shown. The fuel injection system includes a plurality of injectors 10 . Each injector 10 is provided for a corresponding cylinder of the engine. The injector 10 for cylinder #1 has a fuel pressure sensor 20 that detects the fuel pressure in the injector 10 and outputs an electrical signal representing the detected fuel pressure. The injector 10 for cylinder #3 has the same structure as that illustrated. Injectors 10 for cylinders #2 and #4 do not have fuel pressure sensors. The fuel injection system also includes an electronic control unit (ECU) 30 . The fuel injection system is installed on the vehicle.

[0034]Injector 10 is a component of a fuel injection system. The fuel injection system includes a fuel tank 40 for liquid diesel. The fuel injection system includes a fuel pump 41 and a common rail 42 for setting the fuel supply system. The fuel pump 41...

no. 2 example

[0120] In the first embodiment, the pressure drop amounts ΔPu' and ΔPu are used as waveform change amounts of the background waveforms Wu and Wu' used for calculating the correlation coefficients AQ and BQ related to the fuel injection amount. Alternatively, in this embodiment, integrated values ​​of the background waveforms Wu and Wu' for a predetermined integration window are used as the waveform change amounts of the background waveforms Wu and Wu'. The integral value corresponds to Figure 12 The areas Su and Su' are shown shaded on waveforms (c) and (d) in . Correlation coefficients AQ and BQ are calculated from AQ=Q / Su', BQ=Q / Su.

[0121] The start timing of the integration window can be obtained using the pressure drop start timings P1u' and P1u when the non-injected cylinder waveforms Wu, Wu' ​​start falling. For the purpose of defining the integration window, the ECU 30 provides a falling start timing calculation section that calculates the first non-injection cylin...

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Abstract

An apparatus of estimating fuel injection state of a fuel injection system have at least three injectors. The first and second injectors have fuel pressure sensors respectively. The third injector has no fuel pressure sensor. The apparatus detects an injected cylinder waveform to the first injector when the first injector injects fuel. The apparatus detects a first non-injected cylinder waveform to the second injector when the first injector injects fuel. The apparatus calculates correlations between the injected cylinder waveform and the first non-injected cylinder waveform. The apparatus acquires a second non-injected cylinder waveform detected by the first or second fuel pressure sensor when the third injector injects fuel. The apparatus estimates fuel injection state injected from the third injector based on the second non-injected cylinder waveform and the correlations.

Description

technical field [0001] The present disclosure relates to an apparatus for estimating fuel injection states such as fuel injection start timing and fuel injection quantity. Background technique [0002] JP2009-103063A, JP2010-3004A, and JP2010-223184A disclose devices that calculate fuel injection states from injected cylinder waveforms. The injected cylinder waveform shows pressure changes caused by fuel injection for one cylinder. The injected cylinder waveform can be detected by monitoring the fuel pressure supplied to the injectors (eg, fuel injection valves) by a fuel pressure sensor. The device calculates the fuel injection state from the characteristics of the fuel injection system in which the start of the pressure drop caused by the fuel injection and the start timing of the fuel injection have a high degree of correlation. For example, the device calculates the start timing of fuel injection based on the detected onset of pressure drop from the injected cylinder w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40F02D41/02F02M63/02F02M47/02
CPCF02D41/247F02D41/2477F02D41/2467F02D2200/0602
Inventor 高岛祥光
Owner DENSO CORP