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7th International Conference on Mechatronics, Control and Materials (ICMCM 2016)

Copyright © 2016, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Advances in Engineering Research, volume 104

5

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Advances in Engineering Research, volume 104

6

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Advances in Engineering Research, volume 104

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T3000 protection control system[2].ACC signal is calculated from the average number of the three (get the larger number when there is faulty occur. There are four levels:

The first level, showed in the Fig. 8, when burning engine speed up GWI>2.5g, the faulty is not eliminated, engine lag 19s.

Fig.8 Burning room protection logic framework I

The second level, showed in the Fig. 9, when burning engine speed up GWI>3g, the faulty is not eliminated, engine lag 13s.

Fig. 9 Burning room speed up protection logic framework II

Just as showed in the Fig. 10, when burning room speed up GW>8g, the valve stops, need to examine the room

Fig. 10 Burning room speed up protection logic framework III

Level 4, when burning room is speed up GW4>2g at the same time IGV>95%, drop 6MW weight in every 4s, if the fault is still there, then lag 19s (as Level 2)

Aside from that, in order to maintain smooth work of the sensor, have protection at the same time, vibration and speed up as faulty signal. When the engine is working above 47Hz and the burning room is less than 0.1g, the there is fault. If three sensor all have faults, valve stops in 2 seconds. As showed in Fig. 11.

Fig. 11 Burning room ACC protection logic

framework IV Fig. 12 ignition protection logic framework

Protection of the ignition over fuel.During the ignition process, if there is too much fuel get into the burning room, then the combination of the fuel and the air is not great, can not let to the fuel burnt to the end, thus may contain safety issue[3]. The protection system after 12s of ESV (safe

Advances in Engineering Research, volume 104

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ignition time), if the pressure is more than 6kpa, then there is a possibility of too much fuel get in the room. When this occur, worker should discontinue the engine, start again after wait for a while.

Ignition fuel protection through Siemens transmitter detect natural gas pressure. When the number is reach certain limits, transmitter can distribute all these signals. Thus can achieve the protection work.

Suggestion of the program that need to be upgraded

Lubricant liquid level upgrade. Lubricant as the mediate of the lubricant oil, the level of liquid is very important. Siemens set both high and low of the level as dangerous. Low level can trigger the damage of the tank, while high level can lead to too much cooling liquid get into the tank.

Lubricant tank have a long distance magnet detector. On the detector has High I, High II and Low I, Low II four segments. All the protection has switch 2 on 2 as protection. In order to avoid fault, set the third spot as testing spot, use the principal of 3 on 2 as liquid protection.

Natural gas over heated upgrade. Siemens engine T3000 protection, has temperature protection installed. ESV has three natural gas testing point. Any 2 out of 3 above 210 degree can lead to the close of the valve

The objective of this protection system is to prevent the possibility of explosion. However, most domestic design only have heating part, thus the protection system has no practical meaning, suggest to take it off.

Natural gas pre-install part’s ESD protection upgrade. Siemens turbo charger T3000 protection, pre-install ESD valve close can lead to the close of the valve. Like the other “natural gas protection from low pressure”, the react signal is singular, which can lead to mistake, thus suggest to take off this protection.

The upgrade of the low pressure of the compress air. Siemens turbo charger has its special design, to prevent valve to support the engine. It is the operator of the dual air intake, when the air is off, switch can not work. During the speed up process and the sudden stop of the valve, it should maintain open status. In order to keep the air, the design should involve protection system.

Turbo charger mode (air compress station), has three open, respectively 7Bar、6.7Bar and 6.7Bar. All of the judgment logic according to 3 from 2.

Same domestic model of electric equipment, happens continue press decrease caused by pollution. After the air pressure lock is leased, can operate at most 10 minutes. When the alarm of “lower than 7 Bar” is on, can lead to the close of the valve in a short time.

In order to avoid things like this happen again, need to upgrade on these aspects: 1) Take the compressed air in to the can through automatic pressing valve as spare air resource.

Need to make sure that all the pressure is higher than the fixed number. 2) Increase the testing spot of simulation pressure spot to monitor the pressure change. 3) Increase the alarm time of turbo. When the pressure is low, the turbo will start at the same

time and will meet demand in one minute. If it takes more than one minute, then three is something wrong.

Acknowledgement

The valuable material from Shanghai turbo charging factory Shanghai electric equipment company, Nanjing Seimens automation company. At the same time thanks to the meaningful discussion and supportfrom Beijing bridge heat and electricity company, Beijing West gas company and Shenzhen Yuhu electric company.

References

[1] S. Jin, T. Qi and L. Shi: Interpretation of control system of Siemens turbo charger. China electric power press (2016).

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[2] S. Jin, T. Qi and B. Zhang:Natural gas-steam union cycle electricity technology and appliance guide book. China electric power press (2014).

[3] S.Zhang: Turbo charging engine control system . China electric power press( 2012).

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