Comprehensive diagnostic device and method for pressure of high-pressure shunt circuit of mobile diesel engine

Abstract

The invention discloses a comprehensive diagnostic device and method for the pressure of a high-pressure shunt circuit of a mobile diesel engine. The input end of a high-pressure common rail pipeline(7) of the comprehensive diagnostic device is connected with a high-pressure pump oil outlet pipe (6), the output end of the high-pressure common rail pipeline is connected with high-pressure common rail detection openings (10), the high-pressure common rail detection openings are connected with the input ends of high-pressure common rail pipeline valves (12), the output ends of the high-pressurecommon rail pipeline valves are connected with high-pressure common rail detection pipelines (14), and the high-pressure common rail detection pipelines are connected with oil spraying nozzles (21); the number of the high-pressure common rail detection openings, the number of the high-pressure common rail pipeline valves and the number of the high-pressure common rail detection pipelines are all N, and the number of the oil spraying nozzles is M, wherein N>=M; the tail ends of the high-pressure common rail pipeline is connected with a pressure gauge (8) through a pressure gauge pipeline (9); Ndetection holes (24) are formed in a transparent box (20), and the lower ends of the detection holes are connected in parallel through pipelines, then connected into a detection hole oil return pipeline (25) and then connected into an external diesel tank (1); and the oil spraying nozzles are mounted in the detection holes, and detection hole sealing covers (18) need to be screwed on the remaining detection holes.

Description

technical field [0001] The invention relates to a comprehensive diagnostic device and a diagnostic method for a high-pressure branch of a diesel engine, in particular to a comprehensive diagnostic device and a diagnostic method for a mobile high-pressure branch pressure of a diesel engine. Background technique [0002] At present, the large vehicles used in an enterprise are mainly responsible for the transportation of goods within the factory area. The engines used in the vehicles are diesel engines. Most of the diesel engine oil inlet systems use high-pressure common rail technology. The principle is a high-pressure common rail pipeline Provide high-pressure diesel oil for the common use of six or eight fuel injectors for the engine. During the use of the vehicle, the diesel pipeline failure of the engine occurs from time to time, and the diesel pipeline of the vehicle is long, especially the high-pressure pipeline of the vehicle is installed inside the engine. There are ...

AI Technical Summary

Problems solved by technology

During the use of the vehicle, the diesel pipeline failure of the engine occurs from time to time, and the diesel pipeline of the vehicle is long, especially the high-pressure pipeline of the vehicle is installed inside the engine. There are many aspects of oil pipe leakage, such as oil leakage from joints, oil leakage from pipeline cracks, oil leakage from aging and damaged seal rings, and oil leakage faults caused by cracks inside the engine block. vehicle unable to start

[0003] Due to the particularity of the high-pressure common rail of the diesel engine, the high-pressure oil created by the high-pressure pump is evenly distributed to each fuel injector of the engine through the high-pressure common rail, and the leakage caused by one oil circuit or one fuel injector can cause high-pressure common rail In the process of finding the fault, the specific part of the fault cannot be effectively located, and it can only be judged and repaired simply by relying on maintenance experience

If there are problems with several fuel injectors and their related accessories at the same time, there will be a situation where the fault cannot be found out, and the fault cannot be effectively solved after repeated repairs

Currently on the market, although there is a regular high-pressure pump test bench, which can test the high-pressure pump and fuel injectors, because it cannot be moved, it limits the integrity of the vehicle-mounted high-pressure pumps, fuel injectors and their related accessories.

[0004] Due to the deficiencies of the existing technology, many leakage faults such as pipelines, joints, sealing rings, cylinder cracks, and fuel injectors in the high-pressure oil circuit of the diesel engine cannot be effectively and intuitively detected, and maintenance personnel often can only use experience to judge and repair, time-consuming, labor-intensive, inefficient, and the quality of the overhaul cannot be guaranteed after the overhaul is completed

If there are faults in multiple parts of the engine at the same time, the engine cannot be started and the vehicle cannot be used because the faulty parts cannot be checked.

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