A method and device for improving the measurement accuracy of internal combustion engine shafting moment of inertia

Abstract

The invention discloses a method for improving the measurement accuracy of the shafting moment of inertia of an internal combustion engine, which belongs to the technical field of shafting moment of inertia measurement and mainly solves the technical problem of poor accuracy of the existing detection methods. The method is as follows: the inlet of the intake pipe of the internal combustion engine An external independent supercharging device is provided; an external oil heating device is connected to control the oil temperature of the internal combustion engine within a set range; the power curve of the external independent supercharging device is calibrated; the external independent supercharging device is controlled according to the power curve The device works to make the intake pressure of the internal combustion engine offset the pumping loss; obtain the speed change curve of the internal combustion engine during the acceleration process, and calculate the moment of inertia of the shafting system according to the speed change curve. The invention also discloses a device for improving the measurement accuracy of the shafting moment of inertia of the internal combustion engine. The invention can effectively improve the measurement accuracy of the moment of inertia of the shaft system of the internal combustion engine.

Description

technical field [0001] The invention relates to the technical field of shafting moment of inertia measurement, more specifically, it relates to a method and device for improving the measurement accuracy of internal combustion engine shafting moment of inertia. Background technique [0002] The moment of inertia of the internal combustion engine shaft system usually refers to the moment of inertia comprehensively reflected in the rotational dynamics of the crankshaft by all related parts (mechanical moving parts such as crankshaft, connecting rod, piston, camshaft, etc.) during the rotation of the crankshaft of the internal combustion engine. In the design and development of internal combustion engines, the moment of inertia of internal combustion engine shafting is a very important dynamic index, which is usually used to evaluate the acceleration performance of internal combustion engines. Generally, it can be considered that the moment of inertia is low and the acceleration...

AI Technical Summary

Problems solved by technology

Usually by removing the turbocharger, the influence of the hysteresis effect on the rotation resistance can be reduced, but due to the existence of valves and air passages, the hysteresis effect of the gas cannot be completely eliminated, and the existing scheme ignores the hysteresis effect of the gas

In addition, the oil temperature will affect the viscosity of the oil, thus directly affecting the friction torque of the shafting. The existing scheme ignores the influence of the oil temperature on the frictional resistance

Therefore, existing detection schemes have the problem of poor accuracy

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