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Control strategy of engine with low-pressure EGR system and vehicle

A control strategy and engine technology, applied in engine control, engine components, machines/engines, etc., can solve problems such as long pipelines, difficult EGR rates, and affecting engine combustion stability

Pending Publication Date: 2020-06-09
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the exhaust gas needs to go through a long pipeline to enter the combustion chamber of the engine again. When the vehicle is running in a transient state, it is not only difficult to ensure that the EGR rate entering the combustion chamber of the engine is the target EGR rate, but also when the vehicle is coasting and braking. The position of the EGR valve will affect the combustion stability of the engine

Method used

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  • Control strategy of engine with low-pressure EGR system and vehicle
  • Control strategy of engine with low-pressure EGR system and vehicle
  • Control strategy of engine with low-pressure EGR system and vehicle

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0025] Such as figure 1 As shown, the engine with the low-pressure EGR system 100 in this embodiment first absorbs the exhaust gas through the catalytic converter, and after passing through the EGR valve 5 and the EGR cooler 4, before being introduced into the intake air intercooler 1, it needs to go through the booster of the engine. Compressor 3, intake air intercooler 1 and throttle valve 6 and then enter the cylinder, and mix with the oil and gas sprayed out by injector 2 in the cylinder.

[0026] As a result, the control of the EGR...

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Abstract

The first embodiment of the invention discloses a control strategy of an engine with a low-pressure EGR system. The control strategy at least includes the following steps of judging whether a vehicleenters a sliding mode or a braking mode according to the conditions that a driver releases an accelerator or steps down a brake pedal, primarily judging that the vehicle enters the braking mode if itis detected that an accelerator pedal is released and then the brake pedal is stepped down, primarily judging that the vehicle enters the sliding mode if it is detected that the accelerator pedal is released but then the brake pedal is not stepped down, and adjusting the opening degree of an EGR valve according to the mode of the vehicle. In this way, the proper opening degree of the EGR valve iscorrespondingly selected according to different driving modes, and the opening degree of the EGR valve better fits the different driving modes.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a control strategy of an engine with a low-pressure EGR system and a vehicle. Background technique [0002] In the related art, the engine EGR system is external EGR, which leads the exhaust gas after the catalytic converter to the front of the intake supercharger, and needs to pass through the supercharger, the intake air intercooler and the throttle to enter the engine cylinder. In this way, the exhaust gas needs to go through a long pipeline to enter the combustion chamber of the engine again. When the vehicle is running in a transient state, it is not only difficult to ensure that the EGR rate entering the combustion chamber of the engine is the target EGR rate, but also when the vehicle is coasting and braking. In the case of starting, the position of the EGR valve will affect the combustion stability of the engine. Contents of the invention [0003] The present inventio...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02M26/06
CPCF02D41/0077F02M26/06F02D2200/101F02D2200/501
Inventor 崔亚彬张春辉吴飞齐洪飞
Owner GREAT WALL MOTOR CO LTD
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