JPH0541444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioner that controls the temperature and ventilation amount of vehicle interior air.

[Prior Art] In a passenger car that is relatively airtight and has a small space for each passenger, the amount of ventilation as well as the temperature of the air inside the vehicle are important objects to be controlled. Generally, air temperature and ventilation volume are regulated by separate devices, so it has been common for the driver or passenger to adjust the operating conditions of these devices based on subjective judgment.

[Problems to be Solved by the Invention] Therefore, occupants are often not satisfied with the temperature and cleanliness of the air, and excessive ventilation causes the temperature control device to waste energy. It is also connected to

SUMMARY OF THE INVENTION Accordingly, the present invention aims to provide a vehicle air conditioner for the purpose of increasing passenger satisfaction with respect to the temperature of the vehicle interior air and the amount of ventilation, as well as saving energy of the temperature control device.

[Means for Solving the Problems] The present invention, as shown in FIG. a second temperature detection means for detecting the temperature of the air outside the vehicle; a temperature adjustment means for adjusting the temperature of the air inside the vehicle based on the temperature detected by both temperature detection means; a dirt detection means for detecting dirt in at least one of the indoor air and the air outside the vehicle; a ventilation amount setting means for setting a ventilation amount according to the detected dirt; and a ventilation amount setting means for setting the ventilation amount by the temperature detection means. The ventilation amount correcting means corrects the ventilation amount according to the detected temperature, and the ventilation amount adjusting means adjusts the actual ventilation amount of the air inside the vehicle according to the corrected ventilation amount, and the ventilation amount correction means determining means for determining whether the heating and cooling mode by the temperature adjusting means is in maximum cooling or maximum heating; and comparing means for comparing the temperature of the air inside the vehicle and the air temperature outside the vehicle detected by the temperature detecting means; Based on the outputs of the determination means and the comparison means, the vehicle interior air temperature is higher than the vehicle exterior air temperature;
and a correction means that increases the ventilation volume when the vehicle is at maximum cooling, while decreasing the ventilation volume when the vehicle interior air temperature is higher than the exterior air temperature and the vehicle is at maximum heating. adopt.

[Operation and Effect] In this configuration, the ventilation amount of the vehicle interior air is
Basically, it is set depending on the actual dirt or expected state of dirt in the air inside the vehicle detected by the dirt detection means. However, in accordance with the temperature of the air inside the vehicle detected by the temperature detecting means, if the necessary capacity of the temperature adjusting means is to be supplemented, the set ventilation amount is corrected by the ventilation amount correcting means.

For this reason, under normal air conditioning conditions, the ventilation volume is adjusted to be as low as possible depending on the dirtiness of the air inside the vehicle, and when temperature control should be strengthened, the ventilation volume is adjusted to increase or decrease accordingly. Ru.

To describe this ventilation increase or decrease correction more specifically, when the heating/cooling mode by the temperature control means is at maximum cooling and the cabin air temperature is higher than the cabin outside air temperature, the ventilation rate is increased. hand,
By exchanging the relatively high-temperature air inside the vehicle with the low-temperature outside air of the vehicle, ventilation is performed, and at the same time, the cooling heat load is reduced, making it possible to effectively perform the cooling function.

On the other hand, when heating is at maximum and the temperature of the air inside the vehicle is higher than the temperature of the air outside the vehicle, the ventilation volume is reduced and the amount of relatively high-temperature interior air exchanged with the low-temperature outside air is reduced. The heating function can be effectively demonstrated by reducing the heating heat load.

In this way, by adjusting the ventilation volume in conjunction with temperature regulation, the temperature regulation effect is enhanced,
This can contribute to energy saving of the temperature control means.

[Embodiment] In FIG. 2, reference numeral 10 denotes an outside air intake port provided on the side of the bus vehicle, and this intake port 10 is provided with an opening/closing member so as to be opened and closed by an actuator 9A. The intake port 10 is one of the upstream opening ends of the ventilation duct 0, and the ventilation duct 0 is also provided with an opening end for taking in the air inside the vehicle. A wind guide device 1 is provided adjacent to the intake port 10. The wind guide device 1 is composed of a combination of an electric motor and a fan,
By electrically adjusting the rotational speed of the electric motor, the amount of outside air introduced into the vehicle interior can be adjusted, thereby making it possible to adjust the amount of ventilation.

Inside the duct 0, a cooling heat exchanger 2, a heating heat exchanger 3, and an electric fan 4 for indoor circulating air are arranged as temperature control units. Ventilation duct 0
Although the downstream side opening end is not shown, it is assumed that it extends to the ceiling of the vehicle interior. Further, a natural air exhaust port 5 (which may also serve as an air guide port in some cases) is provided at an appropriate location that partitions the interior of the vehicle from the exterior of the vehicle, and an electric ventilation device 6 is further provided. This air exhaust device 6, together with the air guide device 1, has a role of adjusting the amount of ventilation of the air inside the vehicle.

Inside the vehicle, there is an internal air dirt sensor 7A that detects dirt in the air inside the vehicle and generates an electrical signal according to the dirt.
An inside air temperature sensor 7B is disposed near the intake port 10 outside the vehicle interior, and detects dirt in the air outside the vehicle interior and generates an electrical signal responsive to the dirt. Outside air pollution sensor 8
An outside air temperature sensor 8B that detects temperature A and generates an electric signal according to the temperature is provided.

FIG. 3 shows the electrical circuit for ventilation control. The electric signals generated by the inside air dirt and temperature sensors 7A, 7B and the outside air dirt and temperature sensors 8A, 8B are sent to amplifier circuits 11A, 11B, 1, respectively.
The signal is applied to the microcomputer 14 as a digital signal via 2A, 12B and the A/D converter 13.

The microcomputer 14 processes detection signals from the four sensors according to a pre-stored control program, and sends an output signal based on the processing result to a drive circuit 15 for the actuator 9A,
It is applied to the drive circuit 16 for the wind guide device 1 and the drive circuit 17 for the wind exhaust device 6. The drive circuit 15 operates, for example, as a switch so that the opening/closing member 9 selects the position between an open position and a closed position, and the drive circuit 16 operates, for example, as a switch to select the position of the opening/closing member 9 between an open position and a closed position. The capacity is selected from three levels: large, small, and non-capacity, and the drive circuit 17 operates as a switch, for example, to select whether the exhaust device 6 is activated or deactivated.

FIG. 4 shows the general flow of the control program of the microcomputer 14, including an input step A that receives a detection signal from the sensor, and a step B that calculates the composite temperature of the detection signals from the inside air temperature sensor 7B and the outside air temperature sensor 8B. The calculations in step B, including step C, which temporarily sets a heating and cooling mode representing a stage of cooling and heating capacity according to the calculated composite temperature, are performed by multiplying the inside air temperature and the outside air temperature by a preset weighting coefficient, The purpose is to calculate the sum of the following values, and thereby determine the heat load required to maintain and control the vehicle interior air temperature at the set temperature. In this case, the outside air temperature is used to more accurately calculate the heat load. If necessary, the set temperature may be changed by a temperature setting device set by the occupant. In the heating and cooling mode, the cooling heat exchanger 2 is used when cooling with a large heat load.
For example, the capacity of the refrigeration cycle that drives the auxiliary engine is a value that commands the rotational speed of the auxiliary engine in stages, and during heating where the heat load is small, the amount of heat medium flowing into the heating heat exchanger 3 is commanded in stages. This value can be set according to a known temperature adjustment mechanism.

The control program further includes Step D, which calculates the degree of contamination from inside air contamination and outside air contamination, Step E, which sets a ventilation amount level (rank) according to the calculated degree of contamination, and Step E, which corrects the set ventilation rank. F, and an output step G.

The degree of contamination is calculated by multiplying the detected value of each contamination of the inside and outside air by an appropriate weight, and then subtracting the degree of contamination of the inside air from the degree of contamination of the outside air. In other words, the greater the degree of contamination, the greater the contamination of the outside air, which indicates that the amount of ventilation should be suppressed. In the ventilation rank setting step E, as illustrated in FIG. 5, the ventilation rank is set in accordance with the calculated degree of contamination V.
This rank is determined as follows for four stages of ventilation modes: MA, MB, MC, and MD.

(1) MA: Open the opening/closing member 10 mode air guide device 1
It is operated with a large wind guidance capacity, and furthermore, the air exhaust device 6 is operated.

(2) MB: Open the opening/closing member 10, operate the air guide device 1 with low air guide capacity, and then open the air exhaust device 6.
Activate.

(3) MC: Open the opening/closing member 1, stop the air guide device 1, and further stop the air exhaust device 6.

(4) MD: Close the opening/closing member 1 and stop both the air guide device 1 and the air exhaust device 6.

In each of the above modes, when the blower fan 4 is operating at a low and constant rotational speed, 3:
It is assumed that different ventilation volumes can be obtained at a ratio of 2:1:0.

In this way, the temporarily set ventilation mode is corrected in step F. Details of correction step F are illustrated in FIG. In program step 101 of FIG. 6, it is determined whether the heating and cooling mode is the maximum cooling mode. If not, it is determined in step 104 whether or not it is maximum heating. If not, in step 104 it is determined whether or not it is maximum heating. judge. Determine whether or not heating is at maximum. If the maximum cooling or heating is performed, the inside temperature and the outside temperature are compared in steps 102 and 105, respectively. Comparison result, step 103,
At 106, each ventilation mode is raised or lowered by one rank. Although the program is displayed chronologically in FIG. 6, it can be understood as a judgment of logical conditions. That is, in the maximum cooling mode, when the inside temperature is higher than the outside temperature, the ventilation mode is increased by one rank higher than the rank set by the step pressure, thereby improving the response of the cool-down characteristic. Furthermore, if the outside temperature is less than the inside temperature, sufficient cooling capacity is maintained by lowering the ventilation mode by one rank. This condition applies equally in maximum heating mode. In addition, since the ventilation amount is corrected in the maximum cooling or maximum heating state,
Normally, there is no significant problem with ventilation control. Additionally, the operating time at maximum cooling or maximum ventilation is shortened, contributing to energy savings at the air conditioning location.

FIG. 7 shows a modification of the ventilation rank correction step R, in which either raising or lowering the ventilation mode rank may be used.

In addition to cooling, it is also possible to raise the ventilation mode by one rank if the inside air is higher than the outside air in the cooling mode, or raise the ventilation mode by one rank if the inside air is lower than the outside air in the heater mode. It is.

In the embodiment of FIGS. 6 and 7, the steps
Steps 101, 104, 202, and 203 constitute means for determining maximum heating or maximum cooling according to the present invention, and steps 102, 105, and 201 constitute means for comparing air temperature inside and outside the vehicle interior according to the present invention. , further steps
106 and 204 constitute a correction means according to the present invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of the present invention, FIG. 2 is a cross-sectional configuration diagram of a bus vehicle to which the present invention is applied, FIG. 3 is a block diagram showing an electrical system according to an embodiment of the present invention, and FIG. 4 is a flowchart showing an overview of the control program of the microcomputer in FIG. 3, FIG. 5 is an explanatory diagram of step E in FIG. 4, and FIGS. 6 and 7 are flowcharts showing details of the main parts of FIG. 4. It is. 1... Air guide device, 6... Air exhaust device, 7A, 8A... Temperature sensor, 7B, 8B... Dirt sensor, 14... Microcomputer.

Claims (1)

[Claims] 1. A vehicle air conditioner that controls the temperature and ventilation amount of the air inside the vehicle, comprising: a first temperature detection means that detects the temperature of the air inside the vehicle; and a first temperature detection means that detects the temperature of the air outside the vehicle. a second temperature detection means; a temperature adjustment means for adjusting the temperature of the air inside the vehicle based on the temperatures detected by the temperature detection means; and a temperature control means for detecting contamination in at least one of the air inside the vehicle and the air outside the vehicle. dirt detection means; ventilation amount setting means for setting the ventilation amount according to the detected dirt; ventilation amount correction means for correcting the set ventilation amount according to the temperature detected by the temperature detection means; and a ventilation amount adjusting means for adjusting the actual ventilation amount of the air inside the vehicle according to the corrected ventilation amount, and the ventilation amount adjusting means determines whether the heating and cooling mode by the temperature adjusting means is at maximum cooling or maximum heating. a determining means for determining whether or not the temperature is high; a comparing means for comparing the height of the vehicle interior air temperature and the vehicle exterior air temperature detected by the two temperature detecting means; The indoor air temperature is higher than the outdoor air temperature,
A vehicle air conditioner comprising a correction means that increases the ventilation amount when the vehicle is at maximum cooling, and decreases the ventilation amount when the vehicle interior air temperature is higher than the vehicle exterior air temperature and the vehicle is at maximum heating.