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EGR rate calculating method and system with low-pressure EGR system and vehicle

A calculation method and low-pressure technology, applied in the direction of fuel injection control, engine control, machine/engine, etc., can solve problems such as affecting fuel consumption and emissions, inability to know fresh air, and inability to accurately control fuel injection amount, etc. Precisely controlled effects

Inactive Publication Date: 2018-02-06
GREAT WALL MOTOR CO LTD
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Problems solved by technology

At present, the fuel consumption of the vehicle can be reduced by introducing a turbocharger, but the exhaust gas turbocharged engine introduces EGR, that is: Exhaust Gas Recirculation (Exhaust Gas Recirculation), there are still some problems in fuel injection control, such as: the working conditions of the whole vehicle There are many changes. In the process of changing working conditions, the change of transient EGR rate is also a relatively responsible process. For example, the EGR rate in the process of EGR rate from 10% to 20% does not change smoothly. Therefore, it cannot Knowing the amount of fresh air entering the cylinder from time to time, it is impossible to accurately control the amount of fuel injection, which in turn affects fuel consumption and emissions

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  • EGR rate calculating method and system with low-pressure EGR system and vehicle

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Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] figure 2 is a flow chart of an EGR rate calculation method with a low-pressure EGR system according to an embodiment of the present invention.

[0034] Before describing the EGR rate calculation method with the low-pressure EGR system according to the embodiment of the present invention, the engine system will be explained first.

[0035] Such as figure 1 As shown, the engine system includes a low-pressure EGR system and other structures. The low-pressure EGR system includes a catalytic converter 5, an EGR cooler 9, an EGR valve 8, and an EGR intercooler 1 connected in series. The EGR intercooler 1 is connected to the intake side of the engine. The catalytic converter 5 is con...

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Abstract

The invention provides an EGR rate calculating method and system with a low-pressure EGR system and a vehicle. The method comprises the following steps: the concentration of oxygen entering an EGR intercooler is detected; a theoretical EGR rate is obtained according to the concentration of oxygen in air, the concentration of oxygen when a normal combustion equivalence ratio is 1 and the concentration of oxygen entering the EGR intercooler; EGR rate correcting coefficients corresponding to a present temperature of air entering an engine are obtained; and a final EGR rate is obtained according to the theoretical EGR rate and the EGR rate correcting coefficients, so that an oil injecting quantity is determined according to the final EGR rate. The method can precisely control the oil injectingquantity, improves the combustion performance of the engine, and reduces the oil consumption and the emission.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an EGR rate calculation method, system and vehicle with a low-pressure EGR system. Background technique [0002] Environmental issues, energy crisis, stringent emission and fuel consumption regulations have brought severe challenges to the internal combustion engine industry. Reducing fuel consumption and reducing emissions is the goal that major automakers strive to achieve. At present, the fuel consumption of the vehicle can be reduced by introducing a turbocharger, but the exhaust gas turbocharged engine introduces EGR, that is: Exhaust Gas Recirculation (Exhaust Gas Recirculation), there are still some problems in fuel injection control, such as: the working conditions of the whole vehicle There are many changes. In the process of changing working conditions, the change of transient EGR rate is also a relatively responsible process. For example, the EGR rate in the proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D41/00
CPCF02D41/30F02D41/0072
Inventor 崔亚彬郭峰韩松
Owner GREAT WALL MOTOR CO LTD
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