JPS5816913A - Controller for air conditioner of automobile - Google Patents

Abstract

PURPOSE:To economically cool the room of an automobile with an air conditioner including at least two room coolers, by calculating a quantity of heat necessary to equalize the temperature of the room to a command, on the basis of the air temperatures inside and outside the room etc., to control the cooling operation depending on the result of the calculation. CONSTITUTION:A first evaporator 4 is provided in a ventilation duct 1. A second evaporator 23 is provided as a rear cooler at the reat part of an automobile room 8. The outputs of a room temperature sensor 10, an air mix damper opening degree sensor 11, an external air temperature sensor 12, a water temperature sensor 13, an evaporator outlet temperature sensor 14 and a temperature setting unit 15 are entered into a microcomputer 17 to calculate a necessary blowoff temperature first. A command flow rate of air, which is to be provided by the blower motor 22 of the rear cooler and corresponds to the necessary blowoff temperature under the judgment that a compressor 9 is connected, is calculated. The opening or closing of a solenoid valve 25, which corresponds to the necessary blowoff temperature, is determined. As a result, the room coolers are prevented from being turned on and off too frequently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applied to a car air conditioner having at least two cooler units, one of which performs a cooling effect independently, and is effective for controlling the cooling effect. Regarding a control device.

The present invention is particularly useful as a rear cooler control device.

Conventionally, in order to automatically control the operation of the rear cooler, the temperature adjustment state of the front air conditioner that has another built-in cooler unit, that is, the adjustment member of the heater unit that does not have a heating effect and works in mW when combined with the cooler unit, has been changed. It is known to determine whether or not a rear cooler is activated by means of a switch that responds to the adjustment position.

However, since the adjustment position of the above-mentioned adjustment member is determined on the assumption that the cooler unit and heater unit have the proper cooling and heating capacity, if their capacity is insufficient or excessive, the necessary temperature This means that there is no coordination effect. Therefore, the operation of the rear cooler in response to this may fluctuate meaninglessly, resulting in a problem that the truly necessary cooling capacity cannot be satisfied.

The purpose of the present invention is to eliminate such problems.

A feature of the present invention is that the amount of heat required to adjust the temperature inside the vehicle interior to a target value is calculated from the air temperature inside and outside the vehicle interior, and the operation of the rear cooler is controlled based on the calculation result.

The present invention can be configured as a device that has one circuit package to control both the front air conditioner and the rear cooler, or can be configured as a device that has one circuit package to control the rear cooler alone, so that the front air conditioner is It can be configured as an additional device if the

According to a preferred embodiment, in the rear cooler, the on/off operation of the cooler and the stepwise or continuous adjustment of the air flow rate are electrically controlled.

Since the air intake port of the rear cooler is normally open to the rear tray, the blower is operated only when the cooler is in the cooling state to prevent hot air heated in the rear tray from being discharged.

An embodiment of the present invention shown in the accompanying drawings will be described below. First, in FIG. 1, 1 is an air duct that guides air for cooling and heating of the front air conditioner, and the outside air is introduced through the outside air intake port 1a. This system circulates the air inside the vehicle. 2 is an inside/outside air switching tamper that manually switches between outside air introduction and inside air circulation; the outside air introduction state is shown by a solid line, and the inside air circulation state is shown by a broken line.

Reference numeral 8 denotes a blower motor that blows air into the vehicle interior 8 from the outside air intake port 1a or the inside air intake port 1b. Reference numeral 4 denotes an evaporator serving as a cooler through which air blown by the blower motor 3 is cooled, and is disposed across the air duct 1 .

In addition, a rear cooler river blower motor 22 is installed at the rear of the vehicle compartment 8.
This blower motor 22 blows air from the vehicle interior 8 and blows it back toward the vehicle interior 8. 2B is an evaporator serving as a cooler that cools and passes the air blown by the blower motor 22, and 26 is a filter that cleans the passing air.

9 is a compressor that compresses and circulates the refrigerant.

It is connected by a belt to the engine, which is the on-board drive source of an automobile, and is operated by its rotational driving force.It compresses refrigerant and sends it to a condenser (not shown) to liquefy high-pressure refrigerant, and an expansion valve (not shown) The liquefied refrigerant is converted into a low-pressure, low-temperature liquid and sent to the evaporator 4, and one cup of the heat is collected from the blown air to become a low-pressure, low-temperature gas, which is then circulated. This compressor 9 has an electromagnetic clutch 9a for coupling to the engine, and when the electromagnetic clutch 9a is energized, it is connected, and when the electromagnetic clutch 9a is energized, it is disconnected. Further, the compressor 9 is provided with piping 28a and 28b so that the refrigerant flows into the evaporator 23 of the rear cooler at the same time as the evaporator 4.

A solenoid valve 25 for opening the refrigerant passage is connected to this pipe 28a, and when the solenoid valve 25 is energized, the refrigerant is allowed to flow, and when the energization is cut off, the flow of the refrigerant is stopped. It is.

Reference numeral 6 denotes a heater core as a heater disposed within the air duct 1, which introduces engine cooling water and uses the heat thereof to heat the blown air. 7 is an air mix stamper, which dehumidifies and cools the air that has passed through the evaporator 4.
The ratio of the amount of air introduced into the heater core 6 side to be heated and the amount of air to be subdivided is adjusted, and the temperature is adjusted by mixing the cold air of the cooling air and the warm air of the heated air, and the air is blown into the single room 8.

The opening degree of this air mix damper 7 is determined by the temperature of the inside air, the outside air temperature,
The indoor temperature is automatically controlled to maintain the control target set temperature based on various information such as set temperature and damper opening feedback.

10 is a room temperature sensor that detects the temperature inside the single room 8 and generates a room temperature signal; 11 is an opening sensor that detects the opening position of the air mix damper 7 and generates an opening signal; A potentiometer linked to movement is used to feed back its opening for temperature control. 12 is an outside temperature sensor that detects the outside air temperature and generates an outside temperature signal; 15 is a temperature setting device that determines the set temperature of the control target; and 9
The passenger manually determines the desired room temperature. 18 is a water temperature sensor that detects the water temperature at the heater core inlet, and 14 is an evaporator outlet temperature sensor that detects the air temperature at the evaporator outlet.

16 is an A/D that converts the analog signal into a digital signal.
The converter receives a room temperature signal (Tr) from the room temperature sensor 9 and an opening signal (Ar) from the opening sensor 10.

Outside temperature signal (T a m ) from outside temperature sensor 11
.

The water temperature signal (Tw) from the water temperature sensor 13 and the evaporator outlet source signal ('1.'E) from the evaporator outlet temperature sensor 14 are sequentially converted into digital signals.

Reference numeral 17 is a single-chip microcomputer that executes software digital calculation processing according to a predetermined air conditioning control program, and constitutes a calculation processing means. The device is activated by receiving a stabilized voltage from a stabilized power supply circuit (not shown) that generates a stabilized voltage based on the power supply from the source. Through the calculation processing of the microcomputer 17, a command signal for adjusting the rotation speed of the blower motor 8, a command signal for turning on and off the compressor 9, a command signal for adjusting the opening degree of the air mix damper 7, and A command signal for adjusting the rotation speed of the blower motor 22 of the rear cooler and a command signal for turning on and off the solenoid valve 25 are generated.

This microcomputer 17 has a read-only memory (ReadOnly M
memory; ROM), and a central processing unit that sequentially reads the air conditioning control programs of the cvB and OM and executes the corresponding arithmetic processing.
s-ing Unit; CPU) and this (7)
(3PU (7) Random Access Memory, which temporarily stores various data related to arithmetic processing and which can be read by the CPU.
; RAM), a clock generation section that generates reference clock pulses for the various calculations mentioned above with a crystal oscillator 18, and an input/output (Ilo) circuit section that adjusts the input and output of various signals. One-chip large-scale integrated circuit (
It is manufactured by LSI.

19 is an opening adjustment actuator that adjusts the opening of the air mix damper 7, which receives the y@degree command signal output based on the temperature control performance processing from the microcomputer 17 and responds to the opening command signal. It performs the following operations. Reference numeral 5 denotes a drive circuit for controlling the rotation speed of the blower 8, and 24 a drive circuit for controlling the rotation of the blower 22, which controls the rotation speed of the blower according to a signal from the microcomputer 17.

The operation of the above configuration will be explained with reference to the flowchart of FIG. Although this flowchart shows the air blow adjustment of the blower motor 22 and the opening and closing of the solenoid valve 25, which are the main points of the present invention, known techniques can be referred to for other front air conditioner control functions.

When the microcomputer 17 is now in operation, it executes the arithmetic processing of the illustrated air conditioning control program at a cycle of several hundred m5ec. First, in the signal input step 101,
Digital room temperature signal 1゛r from room temperature sensor 9 via A/D converter 16, outside temperature signal Tam, evaporator outlet temperature signal TI, water temperature signal (9) 'I' W, near mix damper opening degree Believe @Ar,! Input and memorize the constant temperature signal i' set and set the required Suita temperature T.
Proceed to AO calculation step 102. In step 102, the required Suita temperature is determined from the data input and stored in the signal input step 101 using the following equation.

Tho = Kse O, XT Se t-Kr Xi'
r-Kam4-C (just l,, Ks e t, Kr,
Kam, Ks, and 0 are predetermined constants. ) Next, in step 10B, it is determined whether or not the electromagnetic clutch 9a of the compressor 9 is in a connected state. If it is in a connected state, the process proceeds to step 104, and if it is not in a connected state, the process proceeds to step 106. In step 104, step 10
The landscape of the rear cooler floor motor 22 with one barrel corresponding to the required Suita temperature determined in step 2 is determined from the following equation.

VAθ=−, 1XTAθ10 (where Nu and O are predetermined constants), and then in step 105 it is determined whether to open or close the solenoid valve 25 corresponding to the required Suita temperature. Hayabusa at 1゛Aθ1.

The magnetic valve 25 is opened and closed with TiO2. (just 10
) 'I'Aθl<'rAθ2) In step 106, the air temperature of the rear cooler blower motor 22 is set to 0 (01i' F ) and the next step 107
The solenoid valve 25 is closed (OFF).

As a result of repeatedly executing this control block, whether the rear cooler blower motor 22 and the solenoid valve 25 are activated or not is determined based on the connection state of the compressor 9, the set temperature, and various sensor inputs. In other words, if the compressor 9 is not connected, it will not function as a cooler at all, so by turning off the blower motor 22 and solenoid valve 25 of the rear cooler, the operation of the rear cooler is stopped, and if the compressor 9 is connected, the set temperature and each This allows the acooler to operate based on sensor input.

When the required Suita temperature is lower than the values set by TAO1 and TAO2, the air cooler operates for cooling, and the lower the required Suita temperature, the greater the amount of cooling air blown. - In parallel with this, the opening degree of the air mix damper 7 of the front air conditioner is controlled according to the required blowout temperature, water temperature signal (Tw), and evaporator outlet cross signal (11) (TE). (Special Enclosure Showa 55-77659
(see publication). Here, since the value of the required Suita temperature corresponds to the heat load in the passenger compartment, the Suita temperature of the front air conditioner and the operation of the rear cooler are always controlled according to the same pattern. Further, even if the opening degree of the air mix damper changes, the operation of the rear cooler does not change as long as the required Suita temperature does not change, so the operation of the rear cooler is stabilized.

In carrying out the present invention, in a control system that operates the compressor 9 intermittently to prevent frosting of the evaporator, it is preferable to determine in step 104 whether or not an operation switch is turned on to operate the compressor.

Furthermore, in addition to the automatic control of the present invention, a control function for operating the rear cooler with a manual switch may be added.

As described above, the present invention controls the operation of the cooler unit, which operates on and off, according to the heat load.

This has an excellent effect (12) in that the cooler unit does not turn on and off unnecessarily and operates stably and accurately.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. FIG. 2 is a flowchart showing the main points of the control program of the microcomputer in FIG. 1... Ventilation duct, 3... Blower motor, 4...
Evaporator as a cooler, 6... Heater core as a heater, 7... Air mix damper, 10...
Room temperature sensor, 12...Outside temperature sensor, 1B...Water temperature sensor. 14...Eva outlet temperature sensor, 15...Temperature setting device,
16... Analog-digital converter, 17... Microcomputer, 19... Opening adjustment actuator, 22... Rear cooler blower motor, 23... Rear cooler evaporator, 24... Rear cooler blower Motor-driven actuator, 25... solenoid valve. Representative Patent Attorney Tsune Okabe (18)

Claims (1)

[Claims] It has two cooler units, the first cooler unit is combined with a heater unit to adjust the temperature, and the second cooler unit is combined with a heater unit to adjust the temperature.
A control device applied to a car air conditioner in which a cooler unit independently performs a cooling operation, comprising means for generating a control parameter for determining an amount of temperature adjustment in a vehicle interior. Means for calculating the necessary amount of heat to be supplied into the vehicle interior according to the control parameters and generating an output signal for instructing the operation of the cooler unit in accordance with the calculation result. A car air conditioner control device equipped with