Power detection method of engine of construction machinery and device thereof

Abstract

The invention discloses a power detection method of an engine of construction machinery and a device thereof. In the device, a connecting shaft is connected with a power output mechanism of the engine and a power input shaft of a driven mechanism, both ends of a connecting shell are respectively connected with a flywheel shell of the engine and a shell of the driven mechanism, a coupling is provided with a torque induction device, a torque signal transmission primary coil and a power receiving secondary coil, the connecting shell is provided with a power transportation primary coil, a secondary coil used for acquiring a torque signal and a junction box which comprises a power conversion circuit, a torque signal modulation circuit and an external port, the torque signal transmission primary coil is in electromagnetic coupling with a torque signal receiving secondary coil, and the power transportation primary coil is in electromagnetic coupling with the power receiving secondary coil. The power detection device of the engine of the construction machinery has the advantages that the structure is simple and compact, and implementation and maintenance are easy.

Description

Technical field [0001] The invention relates to a method and device for detecting power of an engineering machinery engine. technical background [0002] It is very necessary to measure the engine output of construction machinery and the torque received by the hydraulic pump, especially with the continuous improvement of various monitoring requirements for construction machinery, such measurement and monitoring become more necessary. For hybrid engineering machinery that is currently in order to save energy and reduce emissions, in order to achieve dynamic absorption of excess engine power and timely power supplement when engine power is insufficient, such measurement and monitoring have become essential. [0003] However, due to the narrow layout of the engine room of construction machinery, the usual torque detection device has large installation space, complex structure, inconvenient installation and maintenance, etc., the power detection and monitoring technology of the existin...

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Problems solved by technology

[0003] However, due to the small layout space of the engine room of construction machinery, the installation space of the usual torque detection device is large, the structure is complicated, and the installation and maintenance are inconvenient. The method of indirectly measuring the oil flow and pressure by calculating and converting the engine output power

[0004] In the prior art, it is necessary to convert and calculate the hydraulic oil pressure and flow output by the hydraulic pump, and the temperature and viscosity of the hydraulic oil output by the hydraulic pump and the efficiency of the hydraulic pump change make the conversion result and the actual result have a large error. It cannot truly reflect the actual power output by the engine and received by the hydraulic pump

It has the defects that it cannot be directly measured and the measurement accuracy is low. Usually, it can only be used for general dynamic trend analysis, and cannot be used for precise quantitative control and monitoring of loads on engines and hydraulic pumps.

[0005] For this reason, 03121677.3 patent has shown a kind of hydraulic oil pump with torque sensor, but because its torque sensor is arranged in the casing of hydraulic oil pump, make the structure of hydraulic pump complicated, cost increases, also make the hydraulic pump and torque sensor simultaneously Difficult to maintain and repair

Moreover, due to the use of a magnetoelastic torque sensor, if the magnetic shielding is poor, the hydraulic pump parts will be magnetized and easily absorb the wear debris in the oil, resulting in wear and tear of the hydraulic pump parts.

Therefore, the existing hydraulic oil pump with a torque sensor has the defects of complex structure, high cost, poor reliability, and difficult maintenance and repair, and is difficult to popularize and apply in practical applications.

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