基于试验的机油温度对柴油机阻力矩影响规律的预测方法

提出了一种根据在柴油机停机过程中的瞬时转速信号计算柴油机阻力矩的方法,并针对一台多缸柴油机,测量和分析了不同转速下柴油机阻力矩随机油温度的变化规律,采用多项式拟合方法得到阻力矩与机油温度的关系式。试验和计算结果表明：在相同转速下,阻力矩随着机油温度的降低而上升,并呈现二次多项式变化规律;转速越高,阻力矩随着机油温度的降低而上升越多;并通过数据拟合的公式预测了一定机油温度和转速范围内的旋转阻力矩。

Prediction Method on the Effect Rule of Oil Temperature on Diesel Engine Resistance Torque Based on Experiments

The resistance torque of the diesel engine was calculated through a new method that the transient speed signal is collected and processed to get the resistance torque during the shutdown process of the diesel engine. A multi-cylinder diesel engine was studied. The relationship between oil temperature on diesel engine at different speeds and resistance torque was analyzed. Polynomial fitting method was applied to get the relation between resistance torque and oil temperature. The experiment and calculation result shows： At the same speed, resistance torque rises with oil temperature lowering and distributes in quadratic polynomial law with oil temperature; when the speed increases, resistance torque increases more with the oil temperature lowering. Polynomial fitting formula can be used to predict resistance torque in a certain oil temperature and speed range.