Exhaust temperature monitoring device of supercharged diesel engine for ship and monitoring method

Abstract

The invention provides an exhaust temperature monitoring device of a supercharged diesel engine for a ship and a monitoring method. The device is composed of a power supply module (1), thermocouple signal conditioning modules (2), a controller module (3), CAN bus modules (4), RS422 bus modules (5) and a temperature compensation signal conditioning module (6). The controller module (3) provides all interfaces, the power supply module (1) provides a stable power supply separated from an external power supply for the whole device, each thermocouple signal conditioning module (2) comprises four measuring channels, each CAN bus module (4) comprises two CAN bus interfaces, each RS422 bus module (5) comprises two RS422 bus interfaces, and the temperature compensation signal conditioning module (6) comprises two PT1000 thermocouple measuring channels. The invention has convenient use and easy extension and can meet the requirement of exhaust temperature monitor of the diesel engine for the ship and the comprehensive monitoring of the diesel engine.

Description

technical field [0001] The invention relates to a detection device for the exhaust temperature of a diesel engine, in particular to a monitoring device for the exhaust temperature of a marine supercharged diesel engine. The invention also relates to a method for detecting the exhaust temperature of the diesel engine. Background technique [0002] At present, judging the combustion situation of diesel engines by monitoring the exhaust temperature of diesel engines is one of the main means to ensure the safe and efficient operation of diesel engines. The prior art is mainly the monitoring of single-cylinder exhaust temperature or simple exhaust manifold temperature monitoring, such as the U.S. invention patent "Diesel Engine Exhaust Temperature Monitor" ("Diesel Engine Exhaust Temperature Monitor" US 4,122,720) discloses a single diesel engine Cylinder exhaust temperature monitoring device, the device converts the single cylinder exhaust temperature of the diesel engine into ...

AI Technical Summary

Problems solved by technology

[0003] However, most marine diesel engines now use supercharging technology and exhaust cooling and noise reduction technology. The existing technology simply measures the exhaust temperature of a single cylinder or the total exhaust temperature of a diesel engine, which can only measure the uniformity of each cylinder of the diesel engine, the single Simple monitoring of the working conditions of the cylinders or the overall working conditions, without comprehensive monitoring of the single cylinder exhaust temperature of the supercharged diesel engine, the exhaust temperature before the supercharger, the exhaust temperature after the supercharger and the exhaust temperature after the muffler, It is also impossible to diagnose the overall combustion condition, load condition, supercharging condition and exhaust cooling and muffler condition of the diesel engine, which cannot meet the needs of monitoring the exhaust temperature of marine supercharged diesel engines.

At the same time, only monitoring the exhaust temperature cannot fully realize the protection and diagnosis of the diesel engine. The exhaust temperature monitoring device can only be used as a sub-equipment for the comprehensive monitoring of diesel in the ship automation system. It needs to provide relevant information about the exhaust temperature for the entire diesel engine monitoring system. Therefore, it is possible to make a comprehensive judgment on the working state of the diesel engine in combination with other data, but the existing technology does not have a standard communication interface for interconnection with other systems, and cannot meet the needs of modern ship automation and comprehensive monitoring of diesel engines

[0004] In addition, the existing technology does not realize the online calibration of the exhaust temperature measurement channel. When the measurement channel fails and needs to be repaired and replaced, the faulty channel cannot be re-calibrated in time, which affects the accuracy of the exhaust temperature measurement.

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