JPS63207766A - Method of controlling air conditioner for car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioner, and more particularly to a control method for a vehicle air conditioner suitable for improving the difference in comfort for passengers and saving energy.

[Conventional technology]

Conventional vehicle air conditioners control the operation of the vehicle air conditioner by continuously changing the output frequency from an inverter, as described in Japanese Patent Application Laid-Open No. 49-104305.

[Problem that the invention seeks to solve]

In the above conventional technology, the operating frequency of the compressor is controlled only by the temperature inside the train, so if the inside temperature temporarily rises due to the release of air inside the train by opening and closing the doors at the station during commercial operation, the temperature inside the train may rise temporarily due to the boarding and alighting of passengers. When the temperature inside the car rises temporarily due to the exchange of air inside the car with outside air.If a passenger rides with one passenger leaning toward the temperature detection area, the temperature around the area rises due to the passenger's heat generation, and the temperature increases. To cool the inside of the car by increasing the operating frequency of the compressor by emitting hot water, etc.

The interior of the train became too cold, but no consideration was given to the second issue, causing discomfort to passengers. Furthermore, due to the temperature increase, the high frequency operation time of the compressor becomes longer, resulting in an increase in power consumption.

An object of the present invention is to provide a vehicle air conditioner that can perform fine vehicle temperature control and reduce power consumption.

[Means for solving problems]

The above object is achieved by controlling and controlling the compressor of a vehicle air conditioner using an inverter and a microcomputer.

[For production]

The vehicle air conditioner of the present invention can calculate and determine a combination of multiple operating frequencies of the compressor by inputting temperature and occupancy rate information to a microcomputer. This controls the operation of the compressor, so the temperature 1
Now you can drive according to the occupancy rate, and temporary AT
It is now possible to prevent frequency changes due to an increase in X, allowing for more fine-grained control of the degree of a, as well as reducing wasteful operation, resulting in a significant energy-saving effect.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 is a vehicle, 2 is an air conditioner mounted on the vehicle 1, 3 is an inverter for controlling the operation of the compression FI5 installed in the air conditioner 2, 4 is a microcomputer for controlling the operation of the air conditioner 2, etc.; 5 is air conditioner i! 2 is a compressor, 6 is an outdoor heat exchanger that acts as a pseudo-condenser during cooling, 7 is an outdoor fan, 8 is an indoor heat exchanger that acts as an evaporator during cooling, 9 is an indoor fan, and lO is the temperature inside the car. 11 is a thermistor that detects the temperature inside the car, 1 is a thermistor that detects the outside temperature, 13 is a sensor that detects the occupancy rate, 14 is an input device that constitutes the microcomputer 4, 15 is a previously created ROM for storing programs, RA 16 for temporarily storing data
M, 17 is a CPU that performs arithmetic processing, 18 is an inverter 3
It is an output device that issues commands to etc.

Next, to explain the operation of this embodiment, the empty f
14 High temperature discharged from compressor 5 of device ff2.

The high-pressure refrigerant enters the outdoor heat exchanger 6, where it exchanges heat with the outside air, is cooled, becomes narrow, becomes liquid refrigerant, and enters the pressure reducing device M (not shown here, but for example, a capillary tube, an expansion valve, etc.). Here, it becomes a two-phase gas-liquid fluid, enters the indoor heat exchanger 8, exchanges heat with the air inside the car, performs a cooling action while evaporating itself, and returns to the compressor 5 as a gas refrigerant.

Here you need to control the temperature inside the car (inside the car.

Thermistor for detecting outside temperature 11.12. Based on the information input from the sensor 13 that detects the occupancy rate to the microcomputer 40 human power system W14, the ROM 15. RAM
16. The CPU 17 performs arithmetic processing to set the optimum frequency combination, and outputs it to the inverter 3! ! The command is issued by 18.

According to this embodiment, since the combination of frequencies is determined according to the inside and outside temperatures and the occupancy rate, more detailed temperature control can be achieved without waste, improving passenger comfort, and reducing wasted power due to overcooling, etc. This reduces energy consumption and saves energy.

An embodiment of the control according to the present invention will be explained with reference to FIG. 3.4. When the microcomputer 4 starts operating, the input device 1 receives information from the thermistor 11id for outside temperature, thermistor 11id for inside the car temperature, and sensor 13 for detecting the occupancy rate.
4 and ROM15. RAM16. The CPU 17 calculates the optimal operating frequency from each data,
Change the mode and output! ! 18 issues an operating frequency output command to the inverter 3.

When the operating frequency of the compressor 5 is controlled by this method, as shown in FIG. 4, during the morning and evening rush hours, the outside air temperature is not very high, but the occupancy rate becomes abnormally high, so that the inside temperature of the vehicle rises. For this reason, during standard operation (for example, 60.50.
If the highest frequency (35Hz) is less than 60Hz (for example, 60Hz), the cooling power will be insufficient, so change the frequency combination and use a higher frequency (60Hz).
For example, operate at a combination of 80°70.50Hz) and set the temperature setting device l.

Inside the car set in d! control at the same time. In addition, during the daytime, the outside temperature is high but the occupancy rate is low, so the frequency combination during standard operation will have too much cooling power and become too cold (cold shock). Therefore, the frequency combination may be changed to a lower frequency (for example, 40.30Hz) and controlled to a single circle 11i1 degree set by the temperature setting device IO. This allows for a more detailed llil system, and even if there is a temporary temperature rise (door opening/closing, etc.), the maximum frequency is suppressed depending on the occupancy rate, so there is no need to waste electricity, resulting in energy savings. Become.

〔Effect of the invention〕

According to the present invention, by controlling the operation of the inverter using the optimum frequency combination by a microcomputer, it is possible to perform precise temperature control without waste, improving passenger comfort, and reducing wasted power due to overcooling, resulting in energy savings. It has the effect of becoming

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a side view of a vehicle, FIG. 3 is a temperature control flowchart of a microcomputer, and FIG. 4 is a line diagram of one control pattern of the present invention. 2...Air conditioner, 3...Inverter,
4...Microcomputer agent Patent attorney Masaru Ogawa, male, figure 2, figure 3, figure 4

Claims (2)

[Claims] 1. In a vehicle air conditioning system consisting of a compressor, an outdoor heat exchanger, an indoor heat exchanger, an outdoor fan, an indoor fan, an inverter that controls the operating frequency of the compressor, and a microcomputer that controls the inverter, it is used to 1. A method for controlling a vehicle air conditioner, characterized in that a combination of operating frequencies of a compressor is changed according to a rate. 2. A method of controlling a vehicle air conditioner according to claim 1, in which a high operating frequency is used during rush hours in the morning and evening, and a low operating frequency is used during quiet periods during the day.