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Power-on time calculation method and device

A technology of power-on time and calculation method, applied in electrical control, fuel injection control, engine control and other directions, can solve the problems of large deviation of fuel injection, large deviation of rail pressure, affecting engine life, etc., to reduce the actual The effect of the deviation of the fuel injection quantity and the improvement of the engine life

Active Publication Date: 2019-10-01
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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  • Power-on time calculation method and device

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Embodiment Construction

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0042] See figure 1 The fuel supply and injection situation of a two-plunger oil pump with a transmission ratio of 1:1 on a 4-cylinder engine is shown. The crankshaft angle of 720° is a working cycle, during which the oil pump angle is 720°, and the oil pump angle is sprayed every 180° Oil once. From figure 1 It can be seen that the fuel injectors of each cylinder have the same rail pressure during fuel injection. See image 3 The fuel ...

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Abstract

The invention provides a power-on time calculation method and device. The power-on time calculation method comprises the steps that the post-injection rail pressure of this injection cycle of a fuel injector of a current cylinder is predicated; according to the post-injection rail pressure of this injection cycle, the power-on time of this injection cycle of the fuel injector of the current cylinder is calculated. According to the power-on time calculation method and device, the power-on time is calculated by predicating the post-injection rail pressure, so that the actual fuel injection amount difference between fuel injectors of all the cylinder is reduced to the maximum extent, and the service life of an engine is prolonged.

Description

Technical field [0001] The 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 As shown in the schematic diagram of the fuel supply-fuel injection synchronization system relationship, the fuel supply of the high-pressure fuel pump and the fuel injection of the injector in the high-pressure common rail fuel system are often one-to-one correspondence, that is, one fuel supply of the high-pressure fuel pump corresponds to one fuel injection of the injector Therefore, the fuel injectors of each cylinder have the same rail pressure during fuel injection. [0003] Based on this, currently the rail pressure before injection is used to calculate the fuel injector's power-on time. Such as figure 2 The schematic diagram of rail pressure changes before and after the injection of the synchronous system is shown, and the rail pressure P1 is used when calculating the...

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Application Information

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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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