Method and device for improving measurement precision of rotational inertia of internal combustion engine shafting

Abstract

The invention discloses a method for improving the measurement precision of rotational inertia of an internal combustion engine shafting, belongs to the technical field of shafting rotational inertiameasurement, and mainly solves the technical problem that an existing detection mode is poor in precision. The method comprises the steps that an external independent supercharging device is arrangedat an inlet of an air inlet pipe of the internal combustion engine; an engine oil heating device is externally connected to control the engine oil temperature of the internal combustion engine withina set range; a power curve of the external independent supercharging device is calibrated; the external independent supercharging device is controlled to work according to the power curve so as to enable the air inlet pressure of the internal combustion engine to counteract the pumping loss; and a rotating speed change curve of the internal combustion engine in the acceleration process is obtained, and the shafting rotational inertia is calculated according to the rotating speed change curve. The invention also discloses a device for improving the measurement precision of the rotational inertia of the internal combustion engine shafting. The measurement precision of the rotational inertia of the internal combustion engine shafting can be effectively improved according to the invention.

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...

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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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