JPS61211114A - On vehicle air conditioner - Google Patents

Abstract

PURPOSE:To enable feeling of heating to be obtained quickly responding to related actuation by providing an arithmatic means, which finds out the sum of the set temperature by a temperature setting unit and the inside air temperature detected by an inside air sensor, so as to enable the initial revolving speed of a blower to be set in proportion with the above said computed value. CONSTITUTION:In an air conditioner where a blower 3 is controlled by a blower control means 31, an arithmatic means 50 is provided where a value F is computed based on an equation F=Td+(Tr-25) where Td is the set temperature, and Tr is the inside air temperature. In addition, another arithmatic means 38 is also provided where a value T is computed based on an equation T=(N.Ts+L.Tr+M.Ta)-K.Td where K, L, M, and L represent a constant, and Ta represents the outside air temperature. Electric voltage Vm and Va which correspond to each value of F and T, is read out from each of memory means 31f and 31c allowing each of blower control means 31b and 31d to set the revolving speed which corresponds to each of electric voltage Vm and Va respectively. Simultaneously, a switch-over section 31h is allowed to switch over the control of the blower 3 by the control means 31b to the control by the control means 31d when Vm is greater than Va.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioner, and in particular to 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, a heater core 6, and a mode switching door, as shown in FIG. 7.7, a defrost outlet 8, a face outlet 9, and a foot outlet 10. Above cooler 4
The compressor 11, the condenser 12, the receiver tank 13, and the expansion pulp 14 constitute a cooling cycle.

The rotational force of an engine 15 is transmitted to the compressor 11 via a magnetic clutch 16.

Reference numeral 17 denotes an A/D converter, which includes a detected temperature 7r of an inside air sensor 18 that detects the inside temperature of the vehicle, and a position detection potentiometer 1.
9, the opening degree θ of the air mix door 5, the solar radiation temperature TS detected by the solar radiation sensor 20, the outside air temperature Ta detected by the outside air sensor 21, the cooler temperature Tm detected by the cooler temperature sensor 22, Temperature setting device 23
The set temperature Tcl outputted by is converted into a digital signal and outputted to the control device 24.

The control device 24 is composed of, for example, a microcomputer, and includes an inside/outside air switching door control means 27 that controls the inside/outside air switching door 2 via a switching circuit 25 and an actuator 26.
, a compressor control means 29 that controls the magnetic clutch 16 via a drive circuit 28 , a blower control means 31 that also controls the blower 3 via a drive circuit 30 , and an air mix door 5 via a drive circuit 32 and an actuator 33 . mode switching door 7 via air mix door control means 34, switching circuit 35, and actuator 36.
．． 7, and each data 7r, Ts, Ta, 'I'm.

Each control means 27 calculates the total signal T by calculating Td.
．． 31, 34, and an arithmetic means 38 that outputs outputs at 37. 39 is a manual switch for controlling the blower, and 40 is a switch for detecting the water temperature of the radiator.

The compressor control means 29 is a cooler temperature sensor 22
When the detected temperature Tm falls to a temperature level slightly higher than the freezing temperature of the cooler, the compressor is turned off to keep the temperature of the cooler 4 constant.

As is clear from Utility Model Application No. 59-38105, etc., as shown in FIG. A first blower control section 31b sets the rotation speed corresponding to the voltage Vs, and a second blower control section reads out the output voltage Va from the second storage section 31c and sets the blower 3 to a rotation speed corresponding to the voltage Va. Part 31d and vs
>Va, the switching section 31e switches the control of the blower 3 by the first blower control section 31b to the control by the second blower control section 31d.

From the storage unit 31a, as shown in FIG. 5, as the value M given by the following equation decreases, M=Td −Tr .
(1) That is, as the internal temperature subcutaneous r rises, 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 subcutaneous temperature r inside the room increases, so that the feeling of heating is improved. When the voltage Vs supplied to the blower 3 becomes larger than the voltage Va read from the storage section 31c, the blower 3 is switched to the automatic control mode by the second blower control section 31d. That is, as shown in FIG. 6, the calculation means 38 calculates T=(N''
5 +L-Tr +M-Ta)- to -T(L...
・(2) (However, K, L, M, and N are constants) Based on the voltage Va read according to the characteristic Z, the blower 3
is automatically controlled. As a result, the temperature Ta.

The rotation speed of the blower 3 is set based on various factors such as Tr, Ta, Ts, etc., and automatic control mode is performed.

In this way, the blower 3 is switched to the automatic control mode by the second blower control section 31b after the blower 3 is raised to a constant speed as the inside air temperature Tr increases by the first blower control section 31b. 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 poor feeling.

[Problem that the invention seeks 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 with the blower operation if the inside air temperature T rises, but when the outside air temperature Ta is very low or when the window When the air blower 3 is partially open, or when the inside air sensor is installed in a place that is not sensitive to heat, the inside temperature subcutaneous r will not rise quickly and the voltage Vs will not increase. The number of rotations of the heater does not increase, causing the inconvenience that the heating is not activated forever.This also applies when the set temperature π is increased in the initial stage of heating in order to get a feeling of heating quickly.

[Means for solving problems]

A calculation means for calculating the sum of the calculated value F and the internal air temperature 7r, and a first blower control section for setting the initial rotation speed of the blower in proportion to the magnitude of the calculation value F obtained by the calculation means are provided. do.

As a result, when the initial indoor air temperature 7r of heating does not rise,
The speed of the blower can be increased simply by increasing the set temperature Td.

[Effect]

When the set temperature Td is increased, the set temperature TD and the inside air temperature 7
The output of the calculation means for calculating the sum of r increases, and the drive voltage Vm of the blower can be increased.

〔Example〕

1 and 2 (al, (b) are diagrams showing an embodiment of the vehicle air conditioner according to the present invention, and FIG. 3, F=T
d + (Tr-25) The calculated value F includes an element of the sum of the set temperature Tt and the inside air temperature 7r, and this value F is input into the storage means 31f,
A voltage Vm having a magnitude proportional to the magnitude of this calculated value F is read out and supplied to the first blower control section 31b. The control unit 31b sets the blower to a rotation speed corresponding to this voltage Vm. When Vm>Va, the switching unit 31h switches the control of the blower 3 by the first blower control unit 31b to the control by the second blower control unit 31d.

The operation of the above configuration will be explained using the flowchart of FIG. 2(b).

In step 100, various signals are input for the purpose of heating start control (step 101). In step 102, if the radiator cooling water temperature is still cold and the switch 40 is on, the blower is operated at low speed to prevent cold air from being blown out at high speed.

The calculation means 50 calculates a calculation value F including an element of the sum of the set temperature Td and the inside air temperature Tr, and a voltage Vm proportional to this calculation value F is read out from the storage means 30f (step 10
3). Further, the calculation means 38 calculates a total signal T, and based on this total signal T, the voltage Va is read out from the storage means 31C (step 104).

In step 105, the switching unit 31h controls the blower 3 based on the first blower control unit 31b when Vm<va (step 108). In this control, when the occupant increases the set temperature TIL in an attempt to quickly get a feeling of heating, the calculated value F increases, the voltage Vm increases, and the fan rotation speed is increased. When the inside air temperature Tr does not rise and the blower rotation speed is not increased, the set temperature Tt may be increased.

Next, as the voltage Vm increases, the blower rotation speed increases, and when Vm>Va is reached, the switching section 31h is controlled by the second blower control section 31d to
Switch to control.

As a result, the rotation speed is set in accordance with the overall signal T.

〔effect〕

As explained above, according to the present invention, the initial rotation speed of the blower is set based on the sum of the set temperature Td and the internal temperature subcutaneous r, so that when the passenger increases the set temperature Td, the blower is increased. A feeling of heating commensurate with the speed-up operation can be obtained, and since the internal temperature does not rise, it is possible to solve the problem that the speed of the blower cannot be increased forever. In addition, the speed can be increased linearly from a low speed air volume regardless of the internal temperature.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention, FIGS. 2(al) and (b) are characteristic diagrams and time charts for explaining the present invention in detail, FIG.
FIG. 4 is a block diagram showing an example of a conventional vehicle air conditioner, and FIGS. 5 and 6 are characteristic diagrams for explaining its operation. 3...Blower, 18...Inside air sensor,
23...Temperature setting device, 24...Control device, 38.50...Calculating means, 31f, 31c
...Storage means 31b, 31d...First
, second blower control section 31h...switching section

Claims (2)

[Claims] (1) A calculation means for calculating the sum of the set temperature Td of the temperature setting device and the inside air temperature Tr detected by the inside air sensor, and a rotation speed of the blower in proportion to the magnitude of the calculation value F obtained by this calculation means. a first blower control section that sets the rotation speed of the blower according to a preset characteristic based on the magnitude of the difference between the set temperature Td and the inside air temperature Tr; An air conditioner for a vehicle, comprising: a switching section that switches the operation of the second blower control section. (2) The switching unit switches to the control state by the second blower control unit when the rotation speed of the blower controlled by the first blower control unit reaches the rotation speed of the blower controlled by the second blower control unit. An air conditioner for a vehicle according to claim 1, characterized in that: