Universal piston temperature measuring device for combustion engine

Abstract

The invention discloses a universal piston temperature measuring device for a combustion engine. The device comprises a first thermal insulation box, a second thermal insulation box, a first fixing seat, a second fixing seat, an analog switch circuit module, a memory module and a thermocouple. A black box working mode is adopted for the universal piston temperature measuring device for the combustion engine. Before testing, the universal piston temperature measuring device is packaged on a piston; after the ending of the testing, a memory is taken out to read test data; the piston temperatureunder the working condition of a plurality of engines can be continuously measured through one test, therefore, the system has stable working, and errors can be calibrated and eliminated. The whole device moves together with the piston, and no relative movement is available among all subsystems, therefore, the reliability of measuring the piston temperature with the thermocouple is greatly improved. The device is independently and hermetically integrated into a whole and has compact structure, only a little alteration is required on the piston, and the engine per se is unnecessary to alter; and the device is suitable for piston temperature measurement of the combustion engine with different uses.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine testing, in particular to a general-purpose piston temperature measuring device for internal combustion engines. Background technique [0002] The piston is a key component of the internal combustion engine, which bears mechanical and thermal loads, and ablation of the top surface of the piston occurs from time to time. Measuring the temperature of the piston has been one of the hot spots for a long time. At present, there are two types of piston temperature measurement methods: electric quantity measurement and heat plug indirect measurement. [0003] 1. Power measurement [0004] The sensors of power measurement are all thermocouples, the difference is the measurement subsidiary mechanism, and its development history: secondary linkage mechanism→contact measuring device→infrared telemetry→electromagnetic induction→chip storage type. Among them, contact type, infrared telemet...

AI Technical Summary

Problems solved by technology

The idea of ​​use is to test their physical characteristics first, then use other heat plugs of the same batch to complete the temperature measurement of the internal combustion engine piston, and calculate the temperature of the measuring point according to the change value of the physical properties of the heat plug at the measuring point after the test; their main disadvantages It is low measurement accuracy. It is called thermal evaluation in foreign countries. In fact, it is an indirect estimate of the temperature of the piston under steady-state conditions. It is not a measurement in the strict sense, so it is rarely heard in foreign published articles.

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