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众所周知,对柴油机燃油系统进行不拆卸诊断可使用红外线辐射计,它能准确地记录下当喷油装置的控制受到破坏时,气缸排气管表面热流的变化。然后,运用这种间接的方法按照一种诊断参数同时诊断几种故障因素时,需要解决的问题是要判别每种因素对所测定参数的影响。采用基辅汽车公路学院研制的柴油机组合工况法(曲轴转速及负荷)。测定的热流值只取决于某种故障,而不取决于别的因素。 这种方法的实质是在确定的工况下(试验过程中选用了 M3—236柴油机)同时变动喷油装置的3个参数,即改变燃油泵柱塞副向气缸的供油;改变燃油喷油喷射压力;改变供油提前角。热流只受其中一种因素的
It is well-known that an infrared radiometer can be used to diagnose diesel engine fuel system without disassembly. It can accurately record the change of heat flow on the exhaust pipe surface of the cylinder when the control of the fuel injection system is damaged. Then, when using this indirect method to diagnose several fault factors simultaneously according to one diagnostic parameter, the problem to be solved is to determine the influence of each factor on the measured parameter. The diesel engine combined working condition method (crankshaft speed and load) developed by Kiev Automobile Highway Institute was used. The measured heat flow value depends only on a fault and does not depend on other factors. The essence of this method is that under certain conditions (M3-236 diesel engine is selected during the test), three parameters of the fuel injection device are also changed, that is, the fuel supply to the cylinder of the fuel plunger is changed; the fuel injection is changed Injection pressure; change fuel supply advance angle. Heat flow is only one of them