Control method, device and system for natural gas injection during sudden load unloading of engine
A technology of engine load and control methods, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as too rich air-fuel ratio, poor transient response, etc., to reduce gas volume, satisfy reliability, and improve control The effect of precision
Active Publication Date: 2021-07-23
WEICHAI POWER CO LTD +1
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Problems solved by technology
[0003] In view of this, the first object of the present invention is to provide a control method for natural gas injection when the engine is suddenly unloaded. The control method can effectively improve the situation that the air-fuel ratio is too rich and the transient response is poor when the load is suddenly unloaded. The second object of the present invention is to provide a control device and system for natural gas injection when the engine is suddenly unloaded
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Embodiment Construction
[0033] The first object of the present invention is to provide a method for controlling natural gas injection when the engine suddenly unloads the load, which can effectively improve the situation that the air-fuel ratio is too rich and the transient response is poor when the engine is suddenly unloaded , The second object of the present invention is to provide a control device and system for natural gas injection when the engine suddenly unloads.
[0034] 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.
[0035] In ...
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The invention discloses a control method, device and system for natural gas injection during sudden load unloading of an engine. The control method comprises the steps that A, preset injection parameters of cylinders to be injected are calculated; B, residual injection parameters corresponding to residual injection natural gas of each cylinder which is injecting natural gas are calculated; C, the preset injection parameters of the cylinders to be injected are compared with the residual injection parameters of all the cylinders which are injecting the natural gas; and D, whether the residual injection parameters of the cylinders which are injecting the natural gas are equal to the preset injection parameters of the cylinders to be injected or not is judged, if so, the injection parameters of the cylinders to be injected are returned to zero, and if not, the injection parameters of the cylinders to be injected are updated to the preset injection parameters calculated in the step A. According to the control method for natural gas injection during sudden load unloading of the engine, the conditions that the gas-fuel ratio is too high and the transient responsiveness is poor during sudden load unloading can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of engines, more specifically, to a control method, device and system for natural gas injection when the engine suddenly unloads. Background technique [0002] The natural gas engine adopts the intake port injection method. From the calculation of injection parameters such as fuel injection and power-on time and injection advance angle to the ignition near the compression top dead center, there is a relatively large crankshaft angle, and the fuel injection and power-on time is relatively long. In the prior art, the update of the injection parameters of each cylinder is about one working cycle ahead of the compression top dead center of the cylinder, and is only updated once within this interval. If a sudden decrease in working conditions is detected after the calculation of the injection parameters is completed, since the injection parameters executed before the sudden decrease have been updated, the injecti...
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IPC IPC(8): F02D41/30F02D41/00F02D19/02
CPCF02D41/30F02D41/0027Y02T10/30
Inventor 周飞章王立国鹿雪文贾海文
Owner WEICHAI POWER CO LTD