JP3029569B2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning control device for a vehicle, and more particularly to a vehicle using hot water, which is cooling water for a vehicle engine, as a heat source, and an outlet air temperature adjusting means for adjusting a flow rate of the hot water. The present invention relates to an air conditioning control device for a vehicle.

[0002]

2. Description of the Related Art In general, in a vehicle air-conditioning control apparatus using an air-mixed blow-out air temperature adjusting means, a target blow-out temperature is determined based on at least information from an inside air sensor, an outside air sensor, and a set temperature. The vehicle interior temperature is controlled by adjusting the opening of the air mix damper so as to reach the target value. In other words,
This control can be considered as a control method in which feedforward control based on the outside air sensor and the set temperature is added to proportional control based on the difference between the inside air sensor and the set temperature. In addition to such general control, a control method that takes into account the capacity of the heat exchanger is disclosed in Japanese Patent Publication No. 59-39333.

Japanese Patent Application Laid-Open No. 56-82626 discloses a control method for minimizing a difference between an actual blow-off temperature and a target blow-out temperature. The embodiment is exclusively an air-mix type air conditioner. JP-A-56-8
The control disclosed in Japanese Patent Publication No. 2626 is a control method in which feedforward control based on an outside air sensor and a set temperature is added to proportional control based on a difference between an inside air sensor and a set temperature, and the control temperature is finally detected. This can be considered as feedback control adapted to the blowout temperature.

[0004]

SUMMARY OF THE INVENTION The above Japanese Patent Publication No. 59-39.
The technique disclosed in Japanese Patent No. 333 does not basically consider application to an air-conditioning control device for a vehicle of a hot water flow rate adjustment type. Therefore, when this is adopted in the hot water flow rate adjusting formula, it is necessary to consider a change in the differential pressure before and after the hot water flow rate adjusting valve depending on the engine speed. It is necessary to take a method such as providing a relief valve for this purpose, and there is a problem that the structure is complicated, the reliability is low, and the cost is high (A).

[0005] Further, in the case of adopting a hot water flow rate adjustment type in which the response of the change of the blow-out temperature after adjustment is slower than that of the air mix type, it is necessary to increase the [proportional control by the difference between the inside air sensor and the set temperature]. Can not. If the proportional control cannot be increased, feedforward control based on the outside air sensor and other sensors other than the inside air sensor and the set temperature (predictive control by previously determining a target blowout temperature according to an assumed load) is not sufficient. And the difference between the set temperature and the actual vehicle interior temperature increases (B).

Further, it becomes difficult to quickly bring the cabin temperature close to the set temperature at the start of air conditioning operation or when the set temperature is changed.

On the other hand, in the technique disclosed in Japanese Patent Application Laid-Open No. 56-82626, the problems A and B described above can be compensated to some extent, but the feedback control is performed without determining the basic amount of the adjustment amount. Also, it is difficult to quickly bring the vehicle interior temperature close to the set temperature when the air conditioning starts operating or when the set temperature is changed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air-conditioning controller of a hot water flow rate control type which has high reliability without increasing the complexity of the device.
It is an object of the present invention to increase the response speed at the start of operation and at the time of changing a set temperature and to improve control accuracy while ensuring low cost.

[0009]

In order to solve the above-mentioned problems, an air-conditioning control device for a vehicle according to the present invention comprises at least a heat exchanger using hot water as cooling water for a vehicle engine as a heat source;
An outlet air temperature adjusting means for adjusting a flow rate of the hot water flowing into the heat exchanger to adjust a heating degree of air passing through the heat exchanger; and inhaling air inside and / or outside the vehicle interior, A blower that blows the air into the passenger compartment after passing through the heat exchanger, an inside air sensor that detects an air temperature in the passenger compartment, an outside air sensor that detects an air temperature outside the passenger compartment, and the inside of the vehicle by the blower. An air conditioner for a vehicle, comprising: a blowout sensor for detecting a temperature of blown air to be blown; and a temperature setting means for setting a vehicle interior target temperature. In a vehicle air-conditioning control device including a microcomputer that calculates and outputs an adjustment amount of an air temperature adjustment unit,
The microcomputer calculates a basic blowout temperature corresponding to a basic value of an adjustment amount of the blowout air temperature adjusting means based on at least a temperature set by the temperature setting means and a temperature detected by the outside air sensor. Comprising a temperature calculating means, and at least calculates a target outlet temperature based on the set temperature, a temperature detected by the outside air sensor, and a temperature detected by the inside air sensor,
A blowout temperature correction amount calculating unit that calculates a correction amount of the adjustment amount so that a difference between the target blowout temperature and the temperature detected by the blowout sensor falls within a certain temperature range;
Calculating an adjustment amount of the blow-out air temperature adjusting means based on a basic value of the adjustment amount corresponding to the basic blow-out temperature and the correction amount, and performing temperature control in the vehicle cabin by adjustment based on the adjustment amount. What you do.

That is, first, at least a feedforward control amount (basic blowing temperature) is determined using a temperature detected by an outside air sensor and a set temperature, and a basic opening amount of a hot water flow control valve serving as a blowing air temperature adjusting means is determined. To determine. At least, a target blowout temperature is determined using the detected temperature of the inside air sensor and the outside air sensor and the set temperature, and a correction amount is calculated so as to reduce a difference between the detected value of the blowout sensor and the basic blowout temperature. Adjustment amount base corresponding to temperature
In addition to this value , the actual hot water flow control valve opening is determined.

In such a vehicle air-conditioning control apparatus, the opening of the hot water flow control valve is based on the basic air outlet temperature, so that when the air-conditioning operation is started or the set temperature is changed, the vehicle is promptly opened. It is possible to bring the room temperature closer to the set temperature.

Further, by making the correction amount an integrated value obtained by multiplying the detected temperature by the "target blowout temperature-the blowout sensor" by a constant, the actual blowout temperature can be smoothly and quickly reduced with less hunting. Approached. That is, the control based on the basic blow-out temperature quickly controls the target value or a value close to the target value, and performs fine and accurate control based on a specific correction amount.

Further, the detected value of the inside air sensor may be used as the basic air outlet temperature. However, since a large value cannot be taken for [proportional control based on the difference between the inside air sensor and the set temperature], the target air outlet temperature cannot be set as the target air outlet temperature. Must be much smaller than the value used. It is more effective not to use it at all, considering its functions and also to simplify the program.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG.
1 shows an air-conditioning control device for a vehicle according to an embodiment of the present invention. FIG. 1 shows a device arrangement, and FIG. 2 shows a control block diagram.

In FIG. 1, reference numeral 1 denotes a vehicle interior, 2 denotes a vehicle exterior, and the ratio of the amount of intake air 3 from the vehicle interior 1 and / or the amount of intake air 4 from the exterior 2 is adjusted by a damper 5. The blown air 6 whose temperature has been adjusted is blown into the vehicle interior 1.
Reference numeral 7 denotes a heater core as a heat exchanger for heating the blown air, into which an engine cooling water 8 as hot water flows as a heat source. The flow rate of the engine cooling water 8 is adjusted by a hot water flow rate adjusting valve 9.

An evaporator 10 is provided upstream of the heater core 7, and a refrigerant circulates through a refrigerant circuit 13 having a compressor 11 and a condenser 12.

A blower 15 as a blowing means is provided upstream of the outlet 14 and is driven by a motor 16. The temperature of the blown air 6 from the blowout port 14 is detected by a blowout sensor 17 (for example, a thermistor).

The vehicle interior 1 is provided with an inside air sensor 18 (for example, a thermistor) for detecting the air temperature in the vehicle interior 1. In the present embodiment, a solar radiation sensor 19 (for example, a photo sensor) is further provided. ing. An outside air sensor 2 for detecting the air temperature outside the vehicle compartment 2 is provided outside the vehicle compartment 2.
0 (for example, a thermistor) is provided.

As shown in FIG. 2, the controller according to the present invention is provided with a controller 21 having a microcomputer (controller with a microcomputer). The controller 21 receives a set temperature signal from a temperature setting means 22 for setting a target temperature inside the vehicle as Tset, a detected temperature signal from the blowout sensor 17 is Tor, and the inside air sensor 1 is
8 is input as Ti, the temperature signal detected by the outside air sensor 20 as Tam, and the solar radiation correction signal from the solar radiation sensor 19 as Tlc. The input of each sensor is subjected to AD (analog / digital) conversion and stored as temperature data in a RAM (random access memory) in the microcomputer. The set temperature data is also stored in the RAM in the microcomputer.
Stocked in.

In the microcomputer, the basic outlet temperature calculating means 2
3, the basic outlet temperature Toc corresponding to the basic value of the adjustment amount of the outlet air temperature adjusting means (hot water flow rate adjusting valve 9) is calculated.

The calculation of the basic blowing temperature Toc is performed, for example, by the following equation. Toc = a × Tset−b × Tam + c−Tlc where a, b and c are constants. That is, in the present embodiment, the basic outlet temperature Toc is calculated based on the set temperature Tset, the outside air temperature Tam, and the amount of solar radiation Tlc.

The basic blowing temperature Toc can be set in advance as a characteristic as shown in FIG. 3, for example. FIG.
As shown in FIG.
For each of ° C., it can be set as a characteristic line related to the outside air temperature Tam.

In the microcomputer, the blow-out temperature correction amount calculating means 24 calculates a difference P between the target blow-out temperature Toc2 and the target blow-out temperature Toc2 and the detected temperature Tor of the blow-out sensor 17.
An opening correction amount Pd1 of the hot water flow rate control valve 9 is calculated so that d0 and Pd0 fall within a certain temperature range.

The target outlet temperature Toc2 is calculated, for example, by the following equation. Toc2 = Toc + p × (Tset−Ti) where p is a constant. Also, p × (Tset−Ti)
The term is a proportional control term, and is a final correction term of the target outlet temperature in consideration of an input from the inside air sensor 18. That is, the target outlet temperature is calculated in consideration of the air temperature in the vehicle compartment (inside air temperature), its control target temperature (set temperature), and other loads.

The target outlet temperature Toc2 and the outlet sensor 17
The difference Pd0 from the input value Tor is calculated by the following equation. Pd0 = Toc2−Tor That is, the deviation between the measured actual blowing temperature Tor and the target blowing temperature Toc2 is obtained.

Based on the above Pd0, an opening correction amount Pd1 of the hot water flow control valve 9 is calculated as an integrated value of a value obtained by multiplying Pd0 by a constant cp by the following equation, for example. New Pd1 = Old Pd1 + cp × Pd0 That is, the value of Pd1 is updated every time under certain conditions. The condition for performing this operation is, for example, when Pd0 <−cd or cd <Pd0, that is, | Pd0 |> cd
Then, when the absolute value of the deviation exceeds a certain value, the deviation is multiplied by a constant and integrated at regular time intervals to obtain a predetermined correction amount.

Then, the basic blowing temperature Toc and the hot water flow control valve opening correction amount Pd1 obtained by the above calculation are obtained.
Based on the above, the adjustment amount Pocf is calculated by the following equation by the adjustment amount calculation means 25 (hot water flow rate adjustment valve opening degree calculation means) of the blown air temperature adjustment means. Pocf = cq × Toc + cr + Pd1 where cq is a constant and cr is a correction constant.

The calculated value Pocf is output from the controller 21 and is used for actual blowout temperature control. That is, based on the command of the adjustment amount Pocf, the blowout temperature control device 2
6 (that is, a control device including a hot water flow rate adjusting valve 9 and a motor actuator (not shown)) adjusts the flow rate of hot water (engine cooling water), and controls the blow-out temperature and, consequently, the vehicle interior temperature.

That is, the above control can be summarized as follows: target blowout temperature (Toc2) = blowout temperature (Tor).
By adding Pd1, which is an integrated value of Pd0 × cp corresponding to the difference, to the basic blowing temperature (Toc) as a parameter, the opening degree (Pocf) of the hot water flow control valve is determined. The control is performed.

The above-described calculation can be performed at regular intervals, for example, according to the flow shown in FIG.
In FIG. 4, in steps ST1, ST2, and ST3, Toc, Toc2, and Pd0 are respectively calculated, and steps ST4, ST5, and S5, which are calculation execution flows at regular time intervals.
After T6, it is determined in step ST7 whether −cd ≦ Pd0 ≦ cd, and only when Pd0 <−cd or cd <Pd0, the integrated value of Pd1 is calculated in step ST8, and the timer is determined in step ST9. Start. Calculated T
In step ST10, Pocf is calculated based on oc and Pd1.

In this flow, for example, if the opening of the hot water flow rate regulating valve 9 has a limit value, the opening is, for example, less than 0 ° or more than 90 °, and is actually an uncontrollable opening. If there is a condition that satisfies the following condition, the calculation at that time can be omitted or limited so that useless calculation is not performed.

In the vehicle air-conditioning control apparatus according to the present invention as described above, the basic air outlet temperature Toc and the specific correction amount P
d1 and the opening degree control signal P of the hot water flow control valve 9
Since the ocf is calculated and output, the control characteristics are improved as follows as compared with the conventional method.

First, as shown in FIG. 5, the blowout temperature control characteristic is shown in Conventional Example 1 (when the proportional control term due to the difference between the inside air sensor and the set temperature is large, that is, control of the air mix system by feedforward is performed). In the present invention, the control is performed quickly and without hunting to the final target value, as compared to the case of simply replacing the control with the hot water flow control method).

In comparison with Conventional Example 1 (where the proportional control term based on the difference between the inside air sensor and the set temperature is small),
It is controlled to the final target value quickly without causing a time delay and accurately without causing a deviation from the final target value.

Further, in comparison with the conventional example 2 (where the basic amount [basic blowing temperature] is not used, that is, when only feedback control is performed by the blowing sensor), the present invention does not cause a time delay (this conventional example 2). In this case, hunting occurs when the control speed is increased). Stable and accurate control to the final target value is achieved.

As shown in FIG. 6, the temperature control characteristics of the vehicle cabin are different from those of the conventional example 1 (where the proportional control term due to the difference between the inside air sensor and the set temperature is large).
The target temperature is quickly and accurately controlled to the target set temperature without causing large overshoot or hunting.

In comparison with Conventional Example 1 (where the proportional control term based on the difference between the inside air sensor and the set temperature is small),
The target set temperature is quickly and accurately controlled without causing a deviation from the set temperature.

Further, in comparison with the conventional example 2 (when no basic amount is used), in the present invention, the target set temperature is quickly and precisely controlled without causing a time delay.

[0039]

As described above, according to the air conditioning control apparatus for a vehicle according to the present invention, the means for controlling the differential pressure of the hot water flow control valve such as the relief valve is unnecessary, and the apparatus is complicated. It is possible to provide a highly reliable and inexpensive air conditioning control device for a vehicle.

The vehicle air-conditioning control device according to the present invention has extremely high control accuracy to a target value without causing large overshoot or hunting.

Further, when the operation of the air conditioner is started or when the set temperature is changed, the temperature in the vehicle compartment can be quickly and accurately brought close to the target value, the control speed is high, and the control accuracy is extremely high.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioning control device of the present invention.

FIG. 2 is a control block diagram in the apparatus of FIG.

FIG. 3 is a characteristic diagram showing a characteristic example of a basic blowing temperature (Toc) in the control of FIG. 2;

FIG. 4 is a flowchart illustrating an example of a flow in the control of FIG. 2;

FIG. 5 is a characteristic diagram showing an example of a blow-out temperature characteristic of the vehicle air-conditioning control device of the present invention in comparison with a conventional example.

FIG. 6 is a characteristic diagram showing an example of vehicle interior temperature characteristics of the vehicle air-conditioning control device of the present invention in comparison with a conventional example.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 vehicle interior 2 vehicle exterior 3, 4 intake air 5 damper 6 blowout air 7 heater core as heat exchanger 8 engine cooling water (hot water) 9 hot water flow control valve 10 evaporator 11 compressor 12 condenser 13 refrigerant circuit 14 blower outlet 15 blower 16 Blower motor 17 Blow-out sensor 18 Inside air sensor 19 Solar radiation sensor 20 Outside air sensor 21 Controller equipped with microcomputer (microcomputer) 22 Vehicle interior temperature setting means 23 Basic blow-out temperature calculation means 24 Correction amount calculation means 25 Hot water flow control valve opening degree calculation means 26 Blow-out temperature Control device

Claims (3)

(57) [Claims] At least a heat exchanger using hot water as a cooling water for a vehicle engine as a heat source, and a heating degree of air passing through the heat exchanger by adjusting a flow rate of the hot water flowing into the heat exchanger Air temperature adjusting means for adjusting the air temperature, air blowing means for sucking air inside and / or outside the vehicle interior and blowing the air into the vehicle interior after passing through the heat exchanger, and detecting the air temperature in the vehicle interior An internal air sensor, an external air sensor for detecting the temperature of the air outside the vehicle compartment, a blowout sensor for detecting the temperature of the blown air blown into the vehicle interior by the blowing means, and a temperature setting means for setting a vehicle interior target temperature. An air conditioning system for a vehicle, comprising: a microcomputer for calculating and outputting an adjustment amount of the blow-out air temperature adjusting means by inputting information of the sensors and the temperature setting means. The microcomputer calculates a basic blow-out temperature corresponding to a basic value of an adjustment amount of the blow-out air temperature adjusting means based on at least a temperature set by the temperature setting means and a temperature detected by the outside air sensor. A basic blowout temperature calculating means, and calculates a target blowout temperature based on at least the set temperature, the temperature detected by the outside air sensor, and the temperature detected by the inside air sensor. A blowout temperature correction amount calculating means for calculating a correction amount of the adjustment amount such that a difference between the temperature detected by the blowout sensor and the temperature is within a certain temperature range; and at least a basic adjustment amount corresponding to the basic blowout temperature.
An air conditioning control device for a vehicle, wherein an adjustment amount of the blow-out air temperature adjustment means is calculated based on a value and the correction amount, and the temperature in the vehicle compartment is controlled by the adjustment based on the adjustment amount. 2. The air conditioning control apparatus for a vehicle according to claim 1, wherein the correction amount is calculated as an integrated value of a value obtained by multiplying a difference between the target outlet temperature and the temperature detected by the outlet sensor by a constant. 3. The air conditioning control device for a vehicle according to claim 1, wherein the temperature detected by the inside air sensor is not input to the basic blowout temperature calculating means.