Regulation Of Variable Air Volume And PLC Control On Air-Conditioned Coaches

More and more air-conditioned installations on coaches are being adopted with the development of the economy, but the present air-conditioned installations on coaches in our country are still at the elementary stage, which can only fit in with the regulation of indoor coach temperature, but much attention has not yet been paid to the supervision and control over the air quality within sleeping cars. And the contradictions of worsening air quality in indoor sleeping cars are clearly protruding, against which the following research has been done in this article.First of all, on the basis of analyzing the new technology of warm ventilation on air-conditioned coaches both at home and abroad and analyzing the main existing problems concerning air-conditioned installations on passenger cars in our country, the chief problem, at present, is the insufficient in air volume in air-condition system on passenger cars in our country.Secondly, air-condition system of air-change volume has been systematically researched and detailed analysis of research has been done concerning the applications of typical systems, basic conceptions, main patterns as well as traits. At the same time the basic principles and methods of PLC control have been systematically analyzed so as to find out the junction of the air-change system and the technique of PLC control in combination with the air-condition system on passenger cars and fine theoretical basis has been laid for the air-condition system on passenger cars.Finally, based on the theoretical analysis, detailed solutions have been put forward. Thus, the temperature regulation in air-conditioned installations on passenger cars has not only been put into practice, but meanwhile, fresh air volume and indoor pressurehave been regulated as the object so that the regulation of variable air volume of the air-condition installations on passenger cars under different passenger-flow conditions has been made, and as a result, the air quality within sleeping cars has been improved. Therefore, very good results have been achieved in tests.But owing to the restriction of components and practical applications, the above-mentioned system is not very well perfected and improvements remain to made, anyhow, a useful study has been made on the application of the system of variable air volume on air-conditioned passenger cars.