JPH0126486Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle air conditioner, particularly to the control of a blower.

[Conventional technology]

Conventionally, a vehicle air conditioner includes an inside/outside air switching door 2 provided in a duct 1, a blower 3, a cooler 4, an air mix door 5, as shown in FIG.
It includes a heater core 6, mode switching doors 7, 7, a defrost outlet 8, a face outlet 9, and a foot outlet 10. The cooler 4 includes a compressor 11, a condenser 12, a receiver tank 13,
The expansion valve 14 constitutes a cooling cycle, and the rotational force of the engine 15 is transmitted to the compressor 11 via a magnetic clutch 16.

17 is an A/D converter, which detects the temperature Tr detected by the inside temperature sensor 18 that detects the temperature inside the vehicle, the opening degree θ of the air mix door 5 detected by the position detection potentiometer 19, and the solar radiation temperature detected by the solar radiation sensor 20. Ts, the outside air temperature Ta detected by the outside air sensor 21, the cooler temperature Tm detected by the cooler temperature sensor 22, and the set temperature Td outputted by the temperature setting device 23 are each converted into digital signals and sent to the control device 24. Output.

The control device 24 is, for example, a microcomputer or the like, and controls the internal/external air switching door control means 27 which controls the internal/external air switching door 2 via a switching circuit 25 and an actuator 26, and the magnetic clutch 16 via a drive circuit 28. a blower control means 31 and a drive circuit 32 that control the blower 3 via a drive circuit 30, an air mix door control means 34 that controls the air mix door 5 via an actuator 33, a switching circuit 35, and an actuator 36. Mode switching door control means 37 for controlling the mode switching doors 7, 7 via
The total signal T is calculated by calculating each data Tr, Ts, Ta, Tm, and Td, and each control means 27, 31,
34 and 37.

39 is a manual switch for controlling the blower, 4
0 is a switch that detects the water temperature of the radiator.

The compressor control means 29 turns off the compressor 11 to keep the temperature of the cooler 4 constant when the temperature Tm detected by the cooler temperature sensor 22 falls to a temperature level slightly higher than the freezing temperature of the cooler.

As is clear from Utility Model Application No. 59-38105, etc., the blower control means 31 reads out the output voltage Vs from the first storage section 31a at the initial stage of the heating control as shown in FIG. The first blower control section 31b sets the blower 3 in the number, reads the output voltage Va from the second storage section 31c, and stores the voltage Va.
a second blower control section 31d that sets the blower to a rotation speed corresponding to Vs, and a switching section 31e that switches the blower control by the first blower control section 31b to the control by the second blower control section 31d when Vs>Va. Become.

Here, from the first storage unit 31a, as shown in FIG. 5, as the value M given by the following equation (1) decreases, M=Td−Tr...(1) In other words, the inside air temperature Tr As Vs increases, an increasing output voltage Vs is output. Therefore, at the initial stage when the power switch is turned on, the rotational speed of the blower 3 increases by the amount that the inside air temperature Tr increases, so that the heating feeling is improved. The voltage Vs supplied to the blower 3 is the voltage read from the second storage unit 31c.
When Td-Tr becomes larger than Va, in other words, when Td-Tr reaches a predetermined value α (here, α is a variable given corresponding to the total signal T) and Td-Tr<α, the blower 3 is controlled by the second blower. The mode is switched to automatic control mode by the section 31d. That is, the calculation means 3
8, as shown in Fig. 6, as the total signal T calculated according to the following equation (2) changes, T=(N・Ts+L・Tr+M・Ta)−K・Td
...(2) (However, K, L, M, and N are constants) The blower 3 is automatically controlled based on the voltage Va read out according to the characteristic Z. This allows the temperature
The rotation speed of the blower 3 is set based on various factors such as Td, Tr, Ta, Ts, etc., and the automatic control mode is performed.

In this way, the blower 3 is controlled by the first blower controller 31
In b, after the speed increases to a constant speed as the inside air temperature Tr increases, the second blower control section 31d switches to the automatic control mode. this is,
This is because if the automatic control mode is suddenly set, cold air will be blown out strongly and the rotational speed of the blower 3 may change suddenly when the power switch is turned on, resulting in a decrease in feeling.

[Problem that the invention attempts to solve]

However, according to such a configuration, when the power switch is turned on and heating start control is performed, there is no problem in operating the blower as long as the inside air temperature Tr increases.
When the outside air temperature Ta is very low, when a window is partially open, or when the inside air sensor is installed in a place that is not sensitive to heat, the inside air temperature Tr does not rise quickly. Since the voltage Vs does not increase, the rotation speed of the blower 3 does not increase, Td-Tr never reaches α, and there is a problem that the transition to the automatic control mode is delayed.
This also applies when the set temperature Td is increased at the initial stage of heating in order to quickly obtain a feeling of heating.

[Means for solving problems]

In this invention, the set temperature Td of the temperature setting device and the inside air temperature Tr from the inside air sensor are calculated as F = Tr + | Td - N | (N
is a constant), and the air blowing state at the initial stage of heating is controlled by comparing this calculated value F with a set value α.

This improves the poor feeling that occurs when the output Tr from the internal air sensor does not rise quickly.

[Effect]

When the set temperature Td is raised or lowered, the calculated value F increases and the control response time at the initial stage of heating is shortened.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention. In the same figure,
Reference numeral 50 denotes automatic control mode setting means, which presets at least the total signal T obtained by calculating the set temperature Td of a temperature setting device (not shown) and the inside air temperature Tr detected by an inside air temperature sensor (not shown). The blower 3 is automatically controlled based on the set characteristic Z, and is similar to that shown in FIG.
51 is a low speed setting means, and 52 is a high speed setting means, both of which are means for setting the blower 3 to a low rotation speed or a high rotation speed, respectively. Reference numeral 53 denotes calculation switching means for selecting one of the outputs from the automatic control mode setting means 50, the low speed setting means 51, and the high speed setting means 52 and outputting it to the blower 3; 53 changes the control of the blower 3 from the low speed setting means 51 to the automatic control mode setting means when the calculated value F based on the formula F=Tr+|Td−N| (N is a constant) becomes larger than the set value α. Switch to that of 50. On the other hand, if the calculated value F is smaller than the set value α, the blower 3 is controlled only by the low speed setting means 51. That is, when F>α, the automatic control mode setting means 50 performs control, and when F<α, the low speed setting means 51 performs control. Note that 54 is for example
This is a fan switch section that has OFF, Lo, Hi, and AUT switches.

The operation of the above configuration will be explained using the flowchart shown in FIG. Starts by starting heating, and at step 100, the fan switch is set to “Lo”
If it is “Lo”, the air volume of the blower 3 is controlled by the low speed setting means 51. Next, in step 101, it is determined whether the fan switch is "Hi" or not. Similarly, if the fan switch is "Hi", control by the high speed setting means 52 is performed. Stop 1
02 determines whether the fan switch is "AUT" or not. If it is not “AUT”, the blower 3 is turned off. If “AUT”, proceed to the next step. In step 102α, it is determined whether or not the start-up control has ended. If startup control has not been completed, proceed to step 10.
Proceed to step 3. Step 103 is F=Tr+|Td−N
Determine whether |>α. Here, the constant N is a numerical value corresponding to a comfortable temperature, and is, for example, 25 (° C.). For α, a value is selected that optimizes the control response time at the initial stage of heating. Now, if N=25 and the set temperature is 25°C, the fan air volume is controlled by the low speed setting means 51 until Tr>α. Tr>
When α is reached, the fan is switched to control by the automatic control mode setting means 50. Therefore, the response time can be shortened or extended by adjusting the values of Td, N, and α.

〔effect〕

As explained above, according to the present invention, Tr+ |
Since the control mode of the blower is switched based on the comparison between the calculated value F and the set value α, switching to the desired control mode may be significantly delayed due to a malfunction of the inside air temperature sensor, etc. I can solve the problem.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention, Fig. 2 is a flowchart showing the operation of the same embodiment, and Figs. 3 and 4 are block diagrams showing conventional examples, respectively. , Figure 5, Figure 6
The figure is a graph showing the operation of the conventional example. 50...Automatic control mode setting means, 51...Low speed setting means, 53...Calculation switching means.

Claims (1)

[Scope of Claim for Utility Model Registration] Low speed setting means for setting the blower to a low rotation speed, a comprehensive signal T obtained from at least the set temperature Td of the temperature setting device and the inside air temperature Tr detected by the inside air temperature sensor, and a preset automatic control mode setting means for automatically controlling the blower based on the characteristic Z; and when a calculated value F based on the following formula exceeds a set value α, control of the blower is changed from control by the low speed setting means to control by the automatic control mode setting means. An air conditioner for a vehicle, characterized in that it is equipped with arithmetic switching means for switching to. F=Tr+｜Td−N｜ (N is a constant)