Method and device for controlling injection of natural gas engine
A control method and engine technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as poor follow-up of excess air coefficient, and achieve the effect of improving follow-up
Active Publication Date: 2022-04-05
WEICHAI POWER CO LTD
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Problems solved by technology
When a transient condition occurs, the excess air ratio does not follow well
Method used
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[0054] Optionally, in another embodiment of the present invention, an implementation of step S101 includes:
[0055] In one working cycle of the natural gas engine, the injection signal is obtained several times.
[0056] Wherein, the interval between two adjacent acquisitions of injection signals is the first preset interval.
[0057] Specifically, a working cycle of a natural gas engine is 720°. In the specific implementation process of this embodiment, the angular intervals of obtaining injection signals for multiple times are the same, which may be 180° but not limited to obtaining injection signals every 180°.
[0058] S102. Calculate and obtain a second injection duration according to the injection parameters.
[0059] Wherein, the second injection duration is the injection duration required by the natural gas engine for this injection, that is, the theoretical value of the injection duration required for the natural gas engine for this injection.
[0060] Specifically, ...
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The present invention provides a method for controlling injection of a natural gas engine, comprising: acquiring an injection signal; wherein, the injection signal includes: an injection parameter and a first injection duration; calculating a second injection duration according to the injection parameter; judging the Whether the second injection duration is consistent with the first injection duration; if it is determined that the second injection duration is longer than the first injection duration, the second injection duration replaces the first injection duration in the injection signal Injection duration, and controlling the natural gas engine to perform injection within a third injection duration; wherein, the third injection duration is the difference between the second injection duration and the first injection duration. If it is judged that the second injection duration is longer than the first injection duration, update the second injection duration to the injection signal, and control the natural gas engine to inject within the third injection duration, so that the injection amount can better match the current working conditions and improve the excess air coefficient followability.
Description
technical field [0001] The invention relates to the field of natural gas engines, in particular to a method and device for controlling injection of natural gas engines. Background technique [0002] With the development of the economy, almost every household will have a car of their own, resulting in higher and higher oil prices. In comparison, the price of natural gas is much lower than that of gasoline and diesel, and the fuel cost is generally saved by about 50%. Significantly reduce operating costs. Due to the existence of the oil and gas price difference, and the cost of changing the car can be recovered within one year. Therefore, natural gas engines are becoming more and more popular. [0003] At present, natural gas engines inject from the intake port according to the obtained injection information. Before each injection, the injection quantity of this injection will be calculated according to the injection parameters in the injection information, and the injection...
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IPC IPC(8): F02D41/34F02D41/00
CPCF02D41/34F02D41/0027
Inventor 周飞章鹿雪文常铖贾瑞
Owner WEICHAI POWER CO LTD