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Method and device for calculating power-on time

A technology of power-on time and calculation method, which is applied in electrical control, machine/engine, fuel injection control, etc., can solve problems such as large deviation of fuel injection quantity, large deviation of rail pressure, and influence on engine life, etc., to achieve reduction Actual fuel injection quantity deviation and the effect of improving engine life

Active Publication Date: 2022-01-25
WEICHAI POWER CO LTD
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Problems solved by technology

like image 3 The schematic diagram of the fuel supply-fuel injection asynchronous system shown in the diagram shows that the rail pressure deviation before injection between the injectors of each cylinder is extremely large. If the rail pressure before injection is used to calculate the power-on time, the actual The large deviation of the fuel injection quantity will affect the life of the engine

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  • Method and device for calculating power-on time
  • Method and device for calculating power-on time
  • Method and device for calculating power-on time

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] see figure 1 The oil supply and injection situation of two plunger oil pumps with a transmission ratio of 1:1 on a certain 4-cylinder engine is shown. A crankshaft rotation angle of 720° is a working cycle. oil once. From figure 1 It can be seen that the fuel injectors of each cylinder have the same rail pressure when injecting fuel. see image 3 The fuel supply and fuel injection situation of two plunger oil pumps with a transmission ratio of 2:3 o...

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Abstract

The present invention provides a method and device for calculating power-on time. The method includes: predicting the post-injection rail pressure of the current injection cycle of the current cylinder injector; calculating the current cylinder injector according to the injection post-rail pressure of the current injection cycle The power-up time for this injection cycle. The invention calculates the power-on time by predicting the post-injection rail pressure, minimizes the deviation of the actual fuel injection quantity among the fuel injectors of each cylinder, and improves the life of the engine.

Description

technical field [0001] The present invention relates to the technical field of automobiles, and more specifically, to a method and device for calculating power-on time. Background technique [0002] Such as figure 1 In the schematic diagram of the fuel supply-fuel injection synchronous system shown, there is often a one-to-one correspondence between the fuel supply of the high-pressure fuel pump and the fuel injection of the injector in the high-pressure common rail fuel system, that is, one fuel supply of the high-pressure fuel pump corresponds to one injection of the fuel injector. Therefore, the fuel injectors of each cylinder have the same rail pressure when injecting fuel. [0003] Based on this, the rail pressure before injection is often used to calculate the power-on time of the fuel injector. Such as figure 2 The schematic diagram of the rail pressure change before and after the injection of the synchronous system is shown, and the rail pressure P1 is used to ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40F02D41/38
CPCF02D41/40F02D41/3836
Inventor 吕宪勇宋国梁贾瑞薛雷刘翀
Owner WEICHAI POWER CO LTD
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