Device and method for diagnosing cylinder of diesel engine

Abstract

The invention discloses a device and a method for diagnosing a cylinder of a diesel engine, and the device comprises a master CPU, a slave CPU, a high-speed synchronous A / D converter, an output device, an input device, a power supply isolation and conversion device DC / DC, a cylinder head vibration sensor, a cylinder sleeve vibration sensor and an oil pressure sensor, wherein the cylinder head vibration sensor, the cylinder sleeve vibration sensor and the oil pressure sensor are used for detecting the vibration of a cylinder head of the diesel engine, the vibration of a cylinder sleeve and the pressure waves of a high-pressure oil supply pipe respectively, and detection signals are sent to the slave CPU for carrying out signal treatment and calculating characteristic parameters after the synchronous sampling by the high-speed synchronous A / D converter; the slave CPU transmits the characteristic parameters of the cylinder and original measurement data to the master CPU, and the master CPU outputs the obtained data from the output device; and the input device emits a command to the device for diagnosing the cylinder of the diesel engine. The invention further relates to the method using the device for diagnosing the cylinder of the diesel engine for diagnosing.

Description

technical field [0001] The invention relates to a diesel engine cylinder diagnosis device and method, in particular to a device and method for judging the working state of a diesel engine cylinder by detecting cylinder vibration and oil supply pressure waves, and belongs to the detection technical field. Background technique [0002] Diesel engines include four-stroke diesel engines and two-stroke diesel engines. Among them, four-stroke diesel engines are the most widely used, and their working processes include four working processes: air intake, compression, combustion and exhaust. Due to the outstanding advantages of strong power, low fuel consumption (15% to 30% lower than gasoline engine fuel consumption), low pollutant emissions, and high reliability, diesel engines have become the most widely used in today's human society as people's awareness of energy conservation and environmental protection continues to increase. A power machine widely used in various fields of th...

AI Technical Summary

Problems solved by technology

There are obvious defects in this maintenance system and method: 1. A large number of redundant repairs have been generated, resulting in unnecessary waste of manpower and material resources. Regardless of the actual state of the equipment during maintenance, the entire equipment must be disassembled for inspection and measurement, which consumes a lot of money. A lot of manpower, material resources and financial resources; 2. It cannot guarantee the reliable operation of the diesel engine within the interval between two maintenances. The regular maintenance mode is based on the theory of parts wear and probability statistics, and is based on a certain confidence interval and acceptable The economic cost is used to set the maintenance interval. In this way, if the maintenance interval is small, the maintenance cost will be high. If the maintenance interval is large, the probability of failure within the interval between two maintenances will be high.

No matter how the maintenance interval is set, it cannot guarantee the reliable operation of the equipment within the interval between two maintenances; 3. It is difficult to guarantee the quality of maintenance. In the current maintenance mode, due to the lack of necessary testing equipment, only relying on the personal experience of the maintenance personnel to manually The traditional inspection methods such as touching, seeing, and hearing are inevitably affected by random factors such as the inspector's personal emotion and judgment ability, and cannot quickly and accurately judge-isolate-handle the fault location, resulting in leaks. 4. The maintenance time is long and the maintenance cost is high. At present, the maintenance work of diesel engines mainly depends on the personal experience of maintenance personnel. It is difficult to train high-level maintenance personnel and the cost is very high.

And because it is difficult to find the cause of the failure, there are common phenomena of wrong repair and wrong replacement, which lead to long maintenance time and high maintenance cost

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