Piston group cylinder sleeve friction force wireless measuring method and implement device

Abstract

The invention provides a piston group cylinder sleeve friction force wireless measuring method and an implement device, which belong to the technical field of an internal combustion engine. The wireless measuring device comprises strain gauges, a wireless sending module, a receiving antenna, a pressure sensor, a charge amplifier, a photoelectric encoder, a signal acquisition module and a computer. The train gauges are attached to the two sides of the middle portion of a connection rod, and is connected with the wireless sending module; the receiving antenna extends into an engine cylinder through a signal hole in an engine oil pan; and the receiving antenna is connected with the signal acquisition module. The piston group cylinder sleeve friction force wireless measuring method and device are provided on the basis of a mean effective pressure indication method (IMEP), and thus the problem that in the wired measuring process, the connecting rod is always in a high-velocity motion state with a bent axle under the working condition of an engine, and it is necessary to design a special line-leading device to lead out a signal line, however, the line can be damaged easily, and the measuring system is disabled. The measuring method and device are reasonable in design, simple in structure and suitable for optimization design of a piston group cylinder sleeve friction force measuring system.

Description

technical field [0001] The invention relates to the technical field of engine testing, in particular to a wireless measurement method for the friction force of a piston group and a cylinder liner and an implementation device thereof. Background technique [0002] With the development of the automobile industry and the strengthening of environmental protection awareness, relevant laws and regulations have become more and more stringent for energy saving and emission reduction of engines. At the same time, the compactness and strengthening level of internal combustion engines are constantly improving, which puts forward higher requirements for high efficiency and low friction performance of engines. Currently, energy losses from mechanical friction in internal combustion engines account for 4-15% of the fuel energy consumed. It is well known that the friction loss of the piston group accounts for most of the overall mechanical loss of the engine. Improving the lubrication pe...

AI Technical Summary

Problems solved by technology

[0004] At present, the transmission of the axial force measurement of the connecting rod is mainly through the installation of the strain gauge on the connecting rod, and the signal is input to the strain gauge through the wire. Since the connecting rod and the crankshaft are always in high-speed motion under the engine working state, a special design must be made. The lead wire device leads out the signal wires, but under high-speed conditions, the wires are still prone to breakage, which makes the measurement invalid

Images