An air-conditioning system for a vehicle suitable for flammable refrigerants of categories A2, A2L, and A3 is provided. The system is a compact piece of equipment for installation on a vehicle roof and has equipment sections for air treatment and a compressor-liquefier unit, and optionally an outgoing air, an electrical switchbox, and/or silencer. The system is a direct evaporating system in which the air to be conditioned for a passenger area is sealed off within the air-conditioning system such that, in the event of leaks at refrigerant-conducting assemblies, ingress of flammable refrigerant into the interior of the vehicle is prevented. The refrigerant-conducting assemblies and components are located outside the areas where comfort air is conducted, in a separate housing and open to the surroundings.

There is provided an underfloor duct which enables inspection of electric equipment to be easily performed, has a simple structure, and hardly allows water to intrude into a duct passage. An underfloor duct according to an aspect of the present invention is an underfloor duct, provided under a floor of a railcar, for storing electric equipment including a cable. The underfloor duct includes: a box having a frame that projects upward, and an opening that opens downward; and a lid that closes the opening and forms a duct passage between the lid and the box. An end portion of the box is located outside an end portion of the lid in a car width direction.

The present invention discloses an interior air quality monitoring and ventilation control method and system for a train. The interior air quality monitoring and ventilation control method for the train comprises: acquiring multiple groups of interior and exterior air quality detection data; acquiring interior and exterior air comprehensive evaluation index Q.sub.0 and Q.sub.1 by using the experimental data; training an exterior fresh air volume control model if Q.sub.0≥Q.sub.1, or else training an interior air purification control model; detecting the interior and exterior air quality detection data; acquiring the interior and exterior air comprehensive evaluation index Q.sub.0 and Q.sub.1 by using the detection data; if Q.sub.0≥Q.sub.1, calling the exterior fresh air volume control model to obtain the required ventilation volume level and controlling a ventilation system with the output result; otherwise, calling the interior air purification control model to obtain the required ventilation volume level and air purification device power level , controlling the ventilation system and the air purification device with the output results. The present invention can apply suitable ventilation control strategies according to different degrees of air quality, to achieve a health guarantee for the interior air quality of the high-speed train under the conditions of energy conservation and environmental protection.

The present invention discloses an interior air quality monitoring and ventilation control method and system for a train. The interior air quality monitoring and ventilation control method for the train comprises: acquiring multiple groups of interior and exterior air quality detection data; acquiring interior and exterior air comprehensive evaluation index Q.sub.0 and Q.sub.1 by using the experimental data; training an exterior fresh air volume control model if Q.sub.0≥Q.sub.1, or else training an interior air purification control model; detecting the interior and exterior air quality detection data; acquiring the interior and exterior air comprehensive evaluation index Q.sub.0 and Q.sub.1 by using the detection data; if Q.sub.0≥Q.sub.1, calling the exterior fresh air volume control model to obtain the required ventilation volume level and controlling a ventilation system with the output result; otherwise, calling the interior air purification control model to obtain the required ventilation volume level and air purification device power level , controlling the ventilation system and the air purification device with the output results. The present invention can apply suitable ventilation control strategies according to different degrees of air quality, to achieve a health guarantee for the interior air quality of the high-speed train under the conditions of energy conservation and environmental protection.

An air-conditioning control system includes a first inverter that drives a first driving target in accordance with commands received via a first communication network, a second inverter that drives a second driving target in accordance with commands received via the first communication network, a first controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network, and a second controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network. Each of the first controller and the second controller is capable of transmitting, to the first inverter and the second inverter via the first communication network, an invalidation command for invalidating the commands therefrom.

An air-conditioning control system includes a first inverter that drives a first driving target in accordance with commands received via a first communication network, a second inverter that drives a second driving target in accordance with commands received via the first communication network, a first controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network, and a second controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network. Each of the first controller and the second controller is capable of transmitting, to the first inverter and the second inverter via the first communication network, an invalidation command for invalidating the commands therefrom.

Provided is a pressure regulating method in a vehicle, comprising the following steps: S1, detecting a pressure value P in a vehicle compartment; and S2, regulating and correcting the angle of a waste exhaust valve by a control apparatus according to a starting command until target requirements are met. A pressure regulating apparatus in a vehicle for realizing the pressure regulating method is further comprised. The pressure in a vehicle compartment is regulated by regulating the angle of an exhaust valve, so that the pressure in the vehicle compartment is always controlled within a reasonable range, and the problem of pressure change in a vehicle during the operation of the vehicle is solved; meanwhile, comfort of sitting in the vehicle is achieved, and the cost of testing is lowered.

A refrigerant quantity diagnosis device includes: an evaluation value calculation part that calculates a refrigerant quantity index evaluation value including a ratio of a measured refrigerant quantity index value to a reference refrigerant quantity index value in each of a normal period and a determination period; and a refrigerant quantity diagnosis part that diagnoses a refrigerant quantity based on the refrigerant quantity index evaluation value. The evaluation value calculation part calculates a first refrigerant quantity index evaluation value in the normal period and a second refrigerant quantity index evaluation value in the determination period, based on respective reference refrigerant quantity index values having respective values associated with an operating condition of interest, and respective measured refrigerant quantity index values. The refrigerant quantity diagnosis part compares information on the first refrigerant quantity index evaluation value with that on the second one and thereby diagnoses the refrigerant quantity.

An air-conditioning control system includes a first inverter that drives a first driving target in accordance with commands received via a first communication network, a second inverter that drives a second driving target in accordance with commands received via the first communication network, a first controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network, and a second controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network. Each of the first controller and the second controller is capable of transmitting, to the first inverter and the second inverter via the first communication network, an invalidation command for invalidating the commands therefrom.

An air-conditioning control system includes a first inverter that drives a first driving target in accordance with commands received via a first communication network, a second inverter that drives a second driving target in accordance with commands received via the first communication network, a first controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network, and a second controller that is capable of controlling the first inverter and the second inverter by transmitting commands via the first communication network. Each of the first controller and the second controller is capable of transmitting, to the first inverter and the second inverter via the first communication network, an invalidation command for invalidating the commands therefrom.