Deviation compensation method for fuel injection quantity of fuel injector of high-pressure common-rail fuel system
A fuel system and high-pressure common rail technology, applied in charging systems, fuel injection devices, instruments, etc., can solve problems such as fuel injection imbalance and fuel injection quantity deviation, and achieve the effect of relaxing manufacturing tolerances and reducing production costs.
Pending Publication Date: 2022-04-12
KUNMING YUNNEI POWER +1
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Problems solved by technology
As a result, the difference in fuel injection volume of different injectors under the same fuel injection pressure and power-on time leads to unbalanced fuel injection of each cylinder
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[0023] In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below, so as to facilitate the understanding of the skilled person.
[0024] 1. In the high-pressure common rail system: the pre-injection is mainly used to reduce the combustion noise of the engine. The external characteristic points affect the external characteristics of the engine. The oil quantity at the idle speed point affects the idle speed stability and emission of the engine. The emission point is the working point where the engine often works. Emissions results have a significant impact.
[0025] The feature point selection of the fuel injector should be simple and fully represent the working deviation of a single fuel injector. According to the actual operating conditions of the engine, select the following four working points: pre-injection point (900bar, 5mg / hub), external c...
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The invention relates to a fuel injection quantity deviation compensation method for a fuel injector of a high-pressure common-rail fuel system, which belongs to the technical field of engines and mainly comprises the following steps of: (1) selecting four characteristic points, namely a pre-injection point, an external characteristic point, an idling point and a discharge point, and carrying out flow test on the four characteristic points to obtain the deviation between test data and theoretical data; (2) the difference value between the actual fuel injection quantity and the theoretical fuel injection quantity is converted into a code form capable of being recognized by an ECU according to a specific rule and recorded to the fuel injector; (3) identifying and converting the codes into fuel injection quantity deviation values of the four feature points by using an ECU (Electronic Control Unit); (4) according to the current rail pressure and the current fuel injection quantity, the fuel quantity correction function is calculated to correct the fuel quantity; (5) the fuel quantity and the fuel quantity demand value are corrected through the current rail pressure and the fuel quantity correction function, and the power-up time of the fuel injector is calculated; by means of the method, the manufacturing tolerance of the oil injector can be properly widened, the production cost can be reduced, meanwhile, the oil injection quantity of each cylinder tends to be balanced, accurate control over the oil injection quantity is achieved, and the increasingly strict emission regulations are met.
Description
technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a method for compensating the fuel injection volume deviation of a fuel injector of a high-pressure common rail fuel system. Background technique [0002] The high-pressure common rail system has obvious advantages in the control of fuel injection quantity and fuel injection law. It can accurately control the fuel injection quantity, fuel injection pressure and fuel injection law according to different operating conditions of the engine, so as to meet the requirements of engine power, economy and emission. regulatory requirements. [0003] In the high-pressure common rail system, the fuel injection volume is determined by the fuel injection pressure and the power-on time of the fuel injector. For a single injector, its number of injection holes, nozzle diameter and injection cone angle have been determined. Under the same injection pressure and injector power-on time...
Claims
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IPC IPC(8): F02M55/02F02M61/16F02M61/18F02M65/00
Inventor 杜令刚周厅琳阳晓辉刘涛
Owner KUNMING YUNNEI POWER