发动机缸内压缩压力非接触式检测方法研究

发动机汽缸压缩压力是检测发动机机密封性的重要参数.发动机密封性降低,会造成发动机经济性、动力性下降及废气排放指标恶化,因此对各缸压缩压力的检测具有重要意义.现提出一种利用曲轴瞬时转速,进行不解体检测坦克发动机汽缸压缩压力的方法.通过实车测量获得缸压及转速的特征参数,利用灰色理论模型的方法建立了发动机转速脉动与汽缸压缩压力的数学关系.试验结果表明,利用这种方法进行缸内压缩压力测量是可行的.

Study on Non-Touch Measuring Method for the Compression Pressure in Engine Cylinder

Cylinder compression pressure is an important parameter for measuring the hermetical state of an engine. The lowering hermetical state of an engine will not only cause economy and power coastdown, but also worsen the emission evaluating indicators of exhaust gas. So it has important meaning for measuring all cylinders compression pressure. This paper introduces a new method for measuring the compression pressures of tank engine in the way of measuring instantaneous speed of crankshaft without disassembly. The characteristic parameters of cylinder pressure and rotate speed are gained through a large number of tests on tank engines, and a mathematic model about the relation between eng'ine's speed waves and cylinder compression pressures are built in the way of grey theory model. Tests indicate that this way is feasible to measure the cylinder's compression pressure.