Engine system and control method thereof
A technology of engine system and control method, which is applied in the direction of engine control, engine components, combustion engine, etc., and can solve problems such as gas pump wear and tear
Active Publication Date: 2021-03-30
WEICHAI POWER CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to at least solve the problem of accelerated wear of the gas pump caused by the reverse movement of the existing gas pump due to the pressure in the gas buffer tank reaching the limit
Method used
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[0067] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0068] It should be understood that terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated fea...
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The invention belongs to the technical field of engines, and particularly relates to an engine system and a control method thereof. The control method comprises the following steps of: calibrating a maximum pressure value P1 of a gas buffer tank and an initially calculated pressure value P2 of a gas pressurization prediction model; acquiring a real-time pressure value P of the gas buffer tank; comparing the real-time pressure value P with the initially calculated pressure value P2 and the maximum pressure value P1; according to the condition that the real-time pressure value P is not smaller than the initially calculated pressure value P2 and smaller than the maximum pressure value P1, calculating a cycle index N* of a gas pump required by the gas buffer tank through the real-time pressurevalue P and the gas pressurization prediction model; controlling the gas pump to carry out the next working cycle according to the condition that N* is not smaller than 1; and controlling the gas pump to stop working according to the condition that N* is smaller than 1. According to the engine system and the control method thereof, through the arrangement of the gas pressurization prediction model, the relationship between the pressure in the gas buffer tank and the working cycle of the gas pump can be calculated, the reverse operation of a piston in a mid-travel is avoided, the abrasion of the piston is slowed down, and the power consumption of accessories of this part is reduced.
Description
technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to an engine system and a control method thereof. Background technique [0002] In order to inject a sufficient amount of gas into the effective cycle window of the engine and to mix the gas with the air in the cylinder at a faster speed, the in-cylinder direct injection gas engine generally requires a higher gas supply pressure. [0003] The existing gas pressurization technology usually uses a hydraulic system to pressurize the gas to the target pressure through a gas pump. The gas pump uses the piston to compress the gas mixture in the gas tank. When the piston moves to a certain middle position of the effective stroke, the gas pressure in the gas buffer tank reaches the maximum pressure value P1. At this time, the hydraulic oil at the top of the gas pump is suddenly released. The piston rapidly changes its running direction under the action of high-pressure gas in ...
Claims
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IPC IPC(8): F02D41/04F02D19/02F02M21/02
CPCF02D41/0027F02D41/04F02D19/022F02D19/027F02M21/0218F02M21/0245F02M21/0221F02M21/0224Y02T10/40
Inventor 徐威风
Owner WEICHAI POWER CO LTD