Method and system for regulating gas rail pressure
A technology of gas and rail pressure, applied in charging systems, combustion engines, fuel injection devices, etc., can solve problems such as gas waste, and achieve the effect of stabilizing rail pressure fluctuations
Active Publication Date: 2021-11-19
WEICHAI POWER CO LTD
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Problems solved by technology
[0004] When the engine is running with load, if the accelerator pedal is suddenly released to zero opening at this time, the fuel rail pressure will suddenly increase and then decrease rapidly due to the lagging response of the high-pressure oil pump, and the gas pressure regulating module will release the gas To the return gas pipeline of the gas supply system, resulting in the problem of gas waste
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[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0060] It can be known from the background art that in the prior art, the HPDI engine includes a two-way supply system of fuel oil and gas. The fuel supply system consists of a high-pressure fuel pump, fuel common rail and fuel injectors. The gas supply system consists of a gas pressure regulating module, a gas common rail pipe and an injector. The gas pressure regulating module adjusts the gas rail pressure according to the fuel rail pressure, so that the ad...
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The invention discloses a method and system for adjusting fuel rail pressure. It determines whether the obtained vehicle operating state parameters meet the preset switching conditions. The gas pressure regulation module adjusts the gas rail pressure according to the fuel rail pressure value currently collected on the fuel common rail pipe. If it meets the requirements, the gas rail pressure demand value is calculated, and the current required value is calculated according to the gas rail pressure deviation and the gas rail pressure demand value. The set value of the fuel rail pressure enables the gas pressure regulating module to adjust the gas rail pressure according to the fuel rail pressure value currently collected on the fuel common rail pipe. Through the above scheme, the gas pressure regulation module adjusts the gas rail pressure according to the fuel rail pressure value currently collected on the fuel common rail pipe. Since the currently required fuel rail pressure setting value is greater than or equal to the current fuel rail pressure, the rail Pressure fluctuations to avoid gas waste caused by the gas pressure regulating module releasing gas into the return gas pipeline of the gas supply system.
Description
technical field [0001] The invention relates to the technical field of engines, and more specifically, to a gas rail pressure regulating method and system. Background technique [0002] The high pressure direct injection (High Pressure Direct Injection, HPDI) engine is a diesel gas dual fuel engine with diesel ignition. [0003] HPDI engine includes fuel and gas two-way supply system. The fuel supply system consists of a high-pressure fuel pump, fuel common rail and fuel injectors. The gas supply system consists of a gas pressure regulating module, a gas common rail pipe and an injector. The gas pressure regulating module adjusts the gas rail pressure according to the fuel rail pressure, so that the adjusted gas rail pressure is always lower than the fuel rail pressure. [0004] When the engine is running with load, if the accelerator pedal is suddenly released to zero opening at this time, the fuel rail pressure will suddenly increase and then decrease rapidly due to the...
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IPC IPC(8): F02M21/02F02M65/00
CPCF02M21/0239F02M21/0245F02M65/003Y02T10/30
Inventor 李旭苏东超刘世通赵晓
Owner WEICHAI POWER CO LTD