Engine system, calculating method of actual fresh air quantity and vehicle
An engine system and fresh air technology, applied in engine control, engine components, machines/engines, etc., can solve problems such as large gaps in fresh air volume, and achieve benefits to emissions and fuel consumption, precise control of EGR rate, and guaranteed equivalence ratio combustion Effect
Active Publication Date: 2020-06-09
GREAT WALL MOTOR CO LTD
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Problems solved by technology
[0007] Precise control of the actual EGR rate entering the cylinder requires the ability to calculate the real fresh air volume, but in related technologies, there is a large gap between the calculation structure of the fresh air volume and the actual value
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Embodiment Construction
[0032] 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.
[0033] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0034] Such as figure 1 As shown, the engine system of the embodiment of the present invention includes a low-pressure EGR system, and the engine system includes: a compressor 2, an air intake intercooler 3, a cylinder, a turbine 9, a catalytic converter 10, an EGR pipeline, and an ECU.
[0035] The inlet end of the compressor 2 is provided with a main air intake pipe, the main air intake pipe is provided with a first air flow meter 1, the outlet end of the compressor 2 is connected with the inlet end of the air intake intercooler 3, and the outlet of the air intake intercooler 3 A second air flow meter 4, a throttle valve 5, and an intake pressure sensor 6 are sequentially arranged be...
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The invention discloses an engine system, a calculating method of actual fresh air quantity and a vehicle. The engine system comprises a first air flow meter, a second air flow meter, an air intake pressure sensor, an oxygen sensor and an EGR valve, wherein the two ends of the EGR valve are connected with a differential pressure sensor; the first air flow meter, the second air flow meter, the airintake pressure sensor, the EGR valve and the differential pressure sensor are in communication connection with an ECU; the ECU comprises a readable storage medium for storing first computer program;the first computer program is used for calculating the actual fresh air quantity of an engine air cylinder according to the flow m1 detected by the first air flow meter, the flow m2 detected by the second air flow meter, the pressure p detected by the air intake pressure sensor, the opening degree of the EGR valve, the differential pressure delta P detected by the differential pressure sensor andthe oxygen content detected by the oxygen sensor. The engine system can precisely calculate the fresh air quantity of the engine provided with a low-pressure EGR system, ensures the equivalence ratiocombustion of the engine and is beneficial to emission and oil consumption.
Description
technical field [0001] The present invention relates to the technical field of engines, in particular, to an engine system, a vehicle with the engine system, a method for calculating the actual amount of fresh air in the engine system, and a vehicle with the calculation method. 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 are the two core issues at present. [0003] Under the above background, various car companies and research institutes have proposed that the low-pressure EGR system be applied to gasoline engines. The exhaust gas is drawn out from the catalytic converter and introduced before the intake air intercooler, and the cooled exhaust gas is introduced into the cylinder to reduce the temperature of the working fluid in the cylinder. And the specific heat ratio, reduce t...
Claims
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IPC IPC(8): F02D41/14F02D41/18F02D21/08F02M26/06F02M26/47
CPCF02D41/0052F02D41/0072F02D41/1454F02D41/18F02M26/06F02M26/47F02D2200/04F02D2021/083
Inventor 崔亚彬李树会宋栋来刘义佳张士伟关松
Owner GREAT WALL MOTOR CO LTD