JPH02120116A - Controlling method of air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To actualize such comfortable air-conditioner as noiseless by calculating a minimum air blasting quantity, setting the opening of an air-mix damper to a controllable range from a specified operation expression, and the opening of another air-mix damper corresponding to this air blasting quantity. CONSTITUTION:In this control method, there is provided with each of sensors 161-166 detecting each parameter of cab temperature Tr, outside temperature Ram, solar radiation quantity Ts, inlet air temperature Ti into an air duct 1, outlet temperature Te of a cooling heat exchanger 11 and outlet temperature Th of a heating regenerator 13, etc. Then, at a control circuit 14, each value of constant terms X, Y in a specified operation expression Sw=X/Va+Y operating opening Sw of an air-mix damper 12 is found according to a specified expression on the basis of the said various parameters and then these constants X, Y are substituted for the said operation expression whereby a minimum air blasting quantity Va setting the opening Sw to a controllable range, namely, 0<=Sw<=1 is calculated. Each opening of an air blower 10 and the air-mix damper 12 is controlled so as to make this air blasting quantity Va securable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a ventilation duct for supplying air into a vehicle interior, which includes a blower, a cooling heat exchanger, a heating heat exchanger, and a cooling heat exchanger. The present invention relates to a method of controlling a vehicle air conditioner including an air mix damper that adjusts the ventilation ratio of air cooled by an exchanger to the heating heat exchanger to adjust the temperature of air blown into a vehicle interior.

(Prior art) Conventionally, as a control method for such an air conditioner,
According to Publication No. 30931, the vehicle interior temperature Tr is set to a set temperature T.
Calculate the blowing air temperature Td necessary to maintain the temperature at set, calculate the opening degree Sv of the air mix damper necessary to obtain this Td, and control the air mix damper,
It is known that the relationship between Td and the air blower HVa is determined in advance, and Va corresponding to Td is calculated from this relationship to control the air blower. The calculation is performed according to the following equation using the temperature-converted value Ts of the amount of solar radiation as parameters.

Td4stlXTset-+XT+-KamXTam
-KsT++C'(Kset, Kr, Kam, Ks, C
' is a constant) (Problem to be solved by the invention) By the way, if we consider the heat balance between the interior and exterior of the vehicle based on the heating state, the heat exchange capacity of the air conditioner is Q6, and the amount of heat released due to the temperature difference between the interior and exterior of the vehicle. QLI %The amount of incident heat due to solar radiation is Qs
, the heat generated by the occupants m is QM, the amount of heat generated by exhaust system radiation, indoor equipment, etc. is Qps, the vehicle interior temperature Tr and the set temperature Tset.
The following equation holds true, assuming that the amount of heat required to reduce the deviation from ΔQ to zero is ΔQ.

Qg−Qu Qs QMQp+ΔQ −(1
) Here, Q[! = CI)7 Va (Td Tl)Q
U-11(Tr-Tam) 5-KTs ΔQ = CB (Tset Tr).

Here, cp is the low pressure specific heat of the air, γ is the specific gravity of the air, Ti is the temperature of air taken into the air conditioner, U is the thermal conductance of the entire vehicle body, Ca is the heat capacity of the vehicle body ffi, and K is the solar radiation-temperature conversion coefficient.

Assuming that QM and QP are approximately constant, QM
C (constant), and the above Q8, Qu s Qs , ΔQ
By substituting the equation into equation (1), the following equation is obtained.

CpyCa(Td-Ti)=U(Tr-Txm)-KT
s-CIC8(Tset-TI) −(2
) Therefore, if the blowing air mVa and blowing air temperature Td are controlled so as to satisfy equation (2), it is possible to maintain the vehicle interior temperature Tr close to the set temperature Tset, but in the above conventional technology, the air blowing amount is ■Is the air blown out regardless of a? m If
Td is calculated, and the air filtVa is logically determined based on the calculated value of Td. Va and Td are not necessarily controlled so as to satisfy equation (2). The temperature T" may deviate from the set temperature Tset.

In view of the above points, it is an object of the present invention to provide a control method that maintains the temperature inside a vehicle at a set temperature and provides comfortable air conditioning with less noise by reducing the air flow rate to as low as possible. That is the purpose.

(Means for Solving the Problem) In order to achieve the above objective, the present invention derives from the relational expression between the heat exchange capacity of the air conditioner and the heat load necessary to maintain the vehicle interior temperature close to the set temperature. , using an arithmetic expression that uses the opening degree of the air mix damper and the air flow rate of the blower as variables and includes a constant term determined by various parameters related to heat load, and inputs signals from various sensors that detect these parameters to the arithmetic means. After calculating the value of the constant term of the equation, use the equation to determine the minimum air flow rate that keeps the opening of the air mix damper within a controllable range, and the opening degree of the air mix damper that corresponds to this air flow amount. The blower and air mix damper are controlled according to the calculated values of the air flow rate and the opening degree.

(Function) Air mix damper opening degree Sv (5 when all the air cooled by the cooling heat exchanger is ventilated to the heating heat exchanger)
v=1) and the blowing air temperature Td, the following relationship holds true, where the outlet temperature of the cooling heat exchanger is TYO and the outlet temperature of the heating heat exchanger is TH.

Td TE Sv-8E (3) By substituting Td obtained from equation (3) into equation (2) above and converting it into a form to obtain Sv, the following equation is obtained.

sv-+y　　　　　　　...(4) Here, y-TI　-TE 7. Yo, (6) It is.

In the present invention, the value of the constant term XSY in equation (4) is set to the set temperature T
set and various parameters Tr related to heat load.

Tam STs, TI, TII%TE are expressed as (5) and (
6) Substitute into the formula and calculate to determine the controllable range of Sv, that is, 0.
Calculate the minimum air blow EIVa that satisfies ≦Sv≦1, control the blower so as to obtain this calculated air flow, and control the air mix damper with the opening obtained by substituting this calculated air flow into equation (4). control to the degree.

According to this, the air volume Va and the blowing air temperature Td are (2
), the vehicle interior temperature Tr is reliably maintained close to the set temperature TseL, and the blown air 1 nVa is suppressed to the smallest possible air volume, so that the blown air directly hits the human body. The air conditioner does not cause any discomfort, and the air blowing noise is reduced, providing comfortable air conditioning.

(Example) Referring to FIG. 1, (1) indicates a ventilation duct, and at the upstream end of the ventilation duct (1), there is an outside air inlet (2) and an inside air inlet for introducing air inside the vehicle. (3) and both inlets (2
) (3) is provided, and a vent outlet (5), a foot outlet (6), and a defroster outlet are provided at the downstream end of the ventilation duct (1). The outlet (7) and two mode-switching devices that guide air to the outlet (5), (6), and (7) can be freely switched.
) (9), and furthermore, a blower (IG) is provided in the upstream part of the ventilation duct (1), and air is introduced from one of the two inlets (2) and (3) by the operation of the blower (IG). through the ventilation duct (1) to the air outlet (5) (6
) It was made to blow out into the vehicle interior from either of (7).

In the ventilation duct (1), a cooling heat exchanger (+1) is provided downstream of the blower aO, and a heating heat exchanger 03 is provided further downstream via an air mix damper (121). The air mix damper (') adjusts the ratio of the air flow to the heating heat exchanger 03 and the air flow bypassing it, and the air mix damper (a) adjusts the opening degree S
The ventilation ratio of v to the heating heat exchanger 1″+3 is 100%
The time when the temperature becomes 1.0% is set as 0, and the temperature of the blown air temperature d can be decreased steplessly between the maximum temperature obtained with S sea 1 and the lowest temperature obtained with S sea O. did.

The cooling heat exchanger (11) includes a compressor (11a
), capacitor (11b), receiver tank (11cL
It is composed of an electric volator inserted into a refrigerant circulation circuit equipped with an expansion valve (lid), and a compressor (Ila
) is connected to the engine by turning on and off an electromagnetic clutch (11e) to control the operation of the heat exchanger (11), and the heating heat exchanger a3 is constituted by a heater core through which engine cooling water flows. , the air mix damper (1
The heat exchanger i is controlled by the drainage valve (13a)
It is now possible to control one operation.

In the figure, l″lΦ represents each damper (4) (8) (9).
1″+2) and blower (10 and electromagnetic clutch (llc)
A control circuit consisting of a microcomputer that controls the
('lS indicates the operation panel, and the control circuit 01p includes a sensor (IG+) that detects the vehicle interior temperature Tr, and an outside air temperature Ta.
A sensor (1G2) that detects m, a sensor (163) that detects the amount of solar radiation, a sensor (16m) that detects the intake air temperature Ti to the ventilation duct (1), and a cooling heat exchanger (
In addition to manually inputting signals from the sensor (IGs) that detects the outlet temperature Tg of the heating heat exchanger (13) and the sensor (16g) that detects the outlet temperature Tl+ of the heating heat exchanger (13), various Switches, namely air conditioning on/off switch (15a), auto switch (15b+), auto off switch (15b2), temperature setting switch (15c)
, input the signals from the inside/outside air changeover switch (15d), the blowout mode changeover switch (15eL), the defroster switch (151'), and the air volume setting switch (15g), and press the auto switch (15b+). The air blowing mVa of the blower (IQ) and the opening degree Sv of the air mix damper 0 were automatically controlled so as to maintain the set temperature Tset by the temperature setting switch (15c).

In addition, the blower (IQ's air blower fnVa is the drive motor (1
The air mix damper a is increased or decreased depending on the voltage applied to the actuator (12
Opening degree Sv detected by opening detector (12b) according to a)
is controlled so that it becomes the calculated value described later.

The control program when pressing the auto switch (L5b1) to perform automatic air conditioning is as shown in Figure 2. First, the temperature setting W (15c) and each sensor (16t)...
(IGa) and set the set temperature Tset.
, vehicle interior temperature Tr, outside air temperature Tans, solar radiation temperature Ts,
Suction temperature TI, outlet temperature T of cooling heat exchanger l'11)
8. Read the parameter value representing the outlet temperature Tl+ of the heating heat exchanger (13) into l?AM of the control circuit aΦ (■), and then read the above action term from these parameter values by the CPU of the control circuit ('l@). The value of the constant term X1Y in equation (4) explained in (4) is calculated from equations (5) and (6) (■).

In addition, when introducing outside air into the ventilation duct (1), the ventilation mV
ventilation is performed, resulting in heat loss due to ventilation. This heat loss is CpγVa (Tr-Tan), and taking this into account, the left side of equation (2) is cpγVa (Td-Ti
-Tr+Tam), so equation (6) becomes,
When introducing outside air, Y is calculated using this formula.

Next, by substituting the blower ff1Va into the equation (4) as the lower limit air volume Lo of the blower (10), the air mix damper q
Next, calculate whether this calculated value is within the controllable opening range, that is, 0≦Sν.
Determine whether ≦1 (■).

Here, when Sv < 0 or Sv > 1, the air volume Va is the value obtained by adding a predetermined unit air volume ΔV, which is the minimum control range for controlling the increase or decrease of the air volume, to the air volume ff1Va using the previous calculation. (■), return to step ■ again to calculate Sv, repeat the determination process from step ■ to step ■ until 0≦Sv≦1, and find the minimum air flow that satisfies 0≦Sv≦1. HVa and the corresponding opening degree Sv are calculated.

Next, after calculating the blowing mode according to the opening degree Sv, outside temperature Tan, etc. (■), output a command signal corresponding to each calculated value of the blower ff1Va, the opening degree Sv, and the blowing mode (■), Apply a voltage to the drive motor (10a) so that the blower ff1Va becomes the calculated value, and control the air mix damper minnow via the actuator (12a) so that the opening degree Sν becomes the calculated value, and then switch the mode. Damper (8
) (9) is switched and controlled via the actuators (8a) and (9a) so that air is blown into the vehicle interior from the outlet corresponding to the calculation mode.

In addition, when you press the auto-off switch (15b2),
Air volume 'fa set with the air volume setting switch (15g)
The voltage applied to the drive motor (10a) is controlled so that
The opening degree Sv of the air mix damper (1) is controlled according to the above equation (3) so that the temperature set in step c) is reached, and furthermore, the air is blown in the mode set by the blowing mode changeover switch (15c). Moto switching damper (8)
(9).

In addition, the inside/outside air switching damper (4) is connected to the auto switch (15
Regardless of the operation of the auto-off switch (+5b2) or the auto-off switch (+5b2), switching is controlled by the operation of the inside/outside air changeover switch (15d) via the control circuit ('lΦ) and the actuator (4a).

(Effects of the Invention) As described above, according to the present invention, while maintaining the vehicle interior temperature close to the set temperature, the air volume is set as low as possible, and even if the blown air directly hits the human body, discomfort is not caused. This has the effect of providing comfortable air conditioning with minimal noise and low noise.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of an air conditioner used to implement the present invention, and FIG. 2 is a flowchart showing a control program during automatic air conditioning. (1)...Ventilation duct l'lG...Blower 0v...
・Cooling heat exchanger a... Air mix damper (1
31... Heating heat exchanger (1@... Control circuit (calculating means) (1 (it) - (166 N... Sensor patent applicant: 3 people outside Honda Motor Co., Ltd.)

Claims (1)

[Claims] A ventilation duct that sends air into the vehicle interior includes a blower, a cooling heat exchanger, a heating heat exchanger, and a ventilation ratio of the air cooled by the cooling heat exchanger to the heating heat exchanger. A method for controlling a vehicle air conditioner comprising an air mix damper that adjusts the temperature of air blown into the vehicle interior by adjusting the temperature of the air blown into the vehicle interior. These parameters are detected using an arithmetic expression that uses the opening degree of the air mix damper and the air flow rate of the blower as variables, and includes a constant term determined by various parameters related to heat load, which are derived from the relational expression between capacity and heat load. After inputting signals from various sensors to a calculation means to calculate the value of the constant term of the calculation formula, from the calculation formula, determine the minimum air flow rate that keeps the opening degree of the air mix damper within a controllable range;
A vehicle air conditioner characterized in that the opening degree of the air mix damper corresponding to the air volume is calculated, and the blower and the air mix damper are controlled according to the calculated values of the air volume and the opening degree. control method.