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Fuel-injection quantity correction method based on rotation speed change and fuel-injection control method

A technology of speed change and control method, applied in the direction of fuel injection control, electrical control, engine control, etc., can solve the problems of deterioration of diesel engine combustion performance, decrease in air-fuel ratio, etc., to prevent engine smoke and make up for substandard emissions. Effect

Inactive Publication Date: 2017-01-04
JIANGXI HUIER FUEL INJECTION EQUIP
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Problems solved by technology

Especially in the case of a high speed transient rate, the intake air volume obviously cannot keep up with the change of the fuel supply volume, causing the air-fuel ratio to decrease, resulting in a deterioration of the combustion performance of the diesel engine at low speed and transient conditions.

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  • Fuel-injection quantity correction method based on rotation speed change and fuel-injection control method
  • Fuel-injection quantity correction method based on rotation speed change and fuel-injection control method
  • Fuel-injection quantity correction method based on rotation speed change and fuel-injection control method

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0023] refer to figure 1 , the present invention discloses a method for correcting fuel injection quantity based on changes in rotational speed, which includes: calculating the air flow rate measured by the sensor through the following calculations to obtain the intake lag time, and then interpolating the influence coefficient with the rotational speed change rate to calculate the The influence coefficient is multiplied by the main fuel injection quantity to obtain the corrected fuel quantity, where, where τ is the lag time, h is the length of the intake port from the naturally aspirated inlet or turbocharger outlet to the intake valve, R is the radius of the intake manifold, ρ d is the dry air density, u is the intake air velocity. Calculate the smaller of the main fuel in...

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Abstract

The invention discloses a fuel-injection quantity correction method based on rotation speed change. The correction method comprises the steps that the airflow rate measured by a sensor is calculated to acquire the air inlet lag time, then, the airflow rate and the rotation speed change rate are subjected to influence coefficient interpolating calculation, the influence coefficient and the main fuel-injection quantity are subjected to multiplying calculation, and the corrected fuel quantity is obtained. According to the fuel-injection quantity correction method based on rotation speed change, when the working condition of a diesel engine is changed, the main fuel-injection quantity is subjected to quantitative correction according to the current rotation speed change rate, accordingly, matching optimizing of the air inlet quantity and the fuel-injection quantity is achieved, and nonstandard discharging caused by hysteresis is compensated.

Description

technical field [0001] The invention relates to an internal combustion engine oil control system, in particular to a fuel injection amount correction method and a fuel injection control method based on changes in rotational speed. Background technique [0002] The air intake system of a diesel engine has hysteresis, and the intake air response in the cylinder will lag behind the fuel injection response. Especially in the case of a high speed transient rate, the intake air volume obviously cannot keep up with the change of the fuel supply volume, causing the air-fuel ratio to decrease, resulting in a low-speed diesel engine and a deterioration in combustion performance under transient conditions. In view of this, there is a need for further improvement in the prior art. Contents of the invention [0003] The present invention proposes a fuel injection volume correction method based on rotational speed variation. When the operating condition of the diesel engine changes, th...

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Application Information

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IPC IPC(8): F02D41/40F02D41/14F02D41/18
CPCF02D41/14F02D41/182F02D41/402F02D2200/101Y02T10/40
Inventor 赖福州郭开义黄剑辉
Owner JIANGXI HUIER FUEL INJECTION EQUIP
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