Is the sum of the flow rate of fuel (mfv) entering the cylinder with the intake air and the flow rate of the evaporation of the oil film into the cylinder, x is the part of the fuel that is injected by the injector and forms the oil film accounts for the total fuel injected by the injector Ratio, f is the oil film evaporation constant, reflecting the rate of oil film re-evaporation. In this oil film model, x and f are characteristic parameters that characterize the characteristics of the oil film.
Oil film circulation re-evaporation ratio y Oil film re-evaporation time constant f is a concept of time domain, and the injection quantity of engine synchronous fuel injection is calculated and given for each cycle of the engine, which is an engine rotation angle domain the concept of. In order to facilitate the calculation of the synchronous fuel injection quantity, it is necessary to explore the expression form of the oil film re-evaporation time constant f in the engine rotation angle domain. When the engine is running, the synchronous fuel injection is executed once per cylinder and each cycle. The injection flow mfi of each cylinder can be expressed as mfi = 1120knBPWinj (2) where k is the injection constant, g / ms; BPWinj is the basic injection Oil pulse width; n is the number of engine revolutions.
The change in the quality of the oil film per cycle per cylinder can be expressed as mff = 260nmff (3) Combined with equation (1), mff = xkBPWinj-120nfmff (4) can be obtained as y = 120nf (5), equation (4) becomes mff = xkBPWinj-ymff (6) Therefore, the actual physical meaning of y is: the mass of the oil film re-evaporated per cycle accounts for the mass of the entire oil film. It is the manifestation of oil film characteristic parameters in practical application. This has the same meaning as f defined in the text. However, the definition of f in the article is given directly, without mentioning the re-evaporation time constant f of the oil film and the relationship between f and f.
Calibration scheme for characteristic parameters x, y 31 The basic scheme for calibration is under stable operating conditions. The fuel injected into the oil film by the injector is the same as the fuel evaporated and vaporized by the oil film, and the oil film is in a state of dynamic equilibrium. According to equation (6), let mff = 0, the quality of the oil film in dynamic equilibrium state can be obtained as mff = xkyBPWinj (7) When the oil film is in equilibrium state, the fuel injected by the injector and the amount of fuel entering the cylinder In the same way, the actual air-fuel ratio in the cylinder is consistent with the target air-fuel ratio. At this time, it is impossible to obtain information including oil film characteristics by measuring the exhaust air-fuel ratio.
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