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Method for controlling fuel injection when starting engine

A technology of engine start-up and control methods, which is applied in engine control, fuel injection control, machine/engine, etc., and can solve problems such as difficulty in start-up, deterioration of emissions, and deviation of sequential injection start-up response

Active Publication Date: 2010-04-14
CHERY AUTOMOBILE CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] In summary, there are the following technical problems in the prior art: (1) Using synchronous injection may lead to incomplete combustion, difficulty in starting, and deterioration of emissions; (2) Deviation in response to starting of sequential injection

Method used

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  • Method for controlling fuel injection when starting engine
  • Method for controlling fuel injection when starting engine
  • Method for controlling fuel injection when starting engine

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Embodiment Construction

[0034] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0035] The first step is as figure 1 As shown, the system determines the synchronous cylinder number according to the engine crankshaft signal and phase signal (1-tooth or 4-tooth phase). Taking a 4-cylinder engine as an example, the synchronous cylinder is 1 cylinder or 4 cylinders. If cylinder 1 is synchronized (similar to cylinder 4), cylinder 1 is in the compression stroke, cylinder 3 is in the intake stroke, cylinder 4 is in the exhaust stroke, and cylinder 2 is in the power stroke.

[0036] The second step is as figure 2 As shown, after judging the success of the cylinder, start to calculate the fuel injection phase. Calculate the fuel injection pulse width, that is, the fuel injection duration, based on the load, etc., and calculate the fuel injection start angle by combining t...

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Abstract

The invention relates to a method for controlling fuel injection when starting an engine. The starting time of a fuel injector is determined according to the fuel injection time, and the duration time of the fuel injector after starting is determined according to the fuel injection pulse width, wherein the fuel injection time and the fuel injection cylinder number are determined according to the engine crankshaft signal and phase signal obtained by detection; and the fuel injection pulse width is determined according to the detected temperature of the engine, and the compensation is carried out according to the detected battery voltage. The method combines the advantages of the sequential injection and synchronous injection in the current fuel injection control of the engine, and carries out combined control to the synchronous fuel injection and sequential fuel injection on the fuel injection in the starting process.

Description

technical field [0001] The invention relates to the control field of an automobile engine system, is a specific implementation of optimizing the control effect of the engine control system, can be used for the start-up fuel injection control of a 4-cylinder gasoline engine system, and specifically relates to an engine start-up fuel injection control method. Background technique [0002] The current engine technology and engine control technology are becoming more and more perfect, but there is still room for further optimization and improvement. In the currently known technical field, the start-up fuel injection control is basically realized by sequential injection and synchronous injection. From practical applications, it can be found that if the synchronous injection method is completely adopted, the response of starting will be very good, but it may occur that the fuel in a certain cylinder cannot completely enter the cylinder for combustion, resulting in difficulty in st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/06F02D41/30
Inventor 蒋思望
Owner CHERY AUTOMOBILE CO LTD
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