JP2003252022A - Control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device suitable as an air conditioning device for a vehicle to improve comfortability by enabling prevention of overshoot and undershoot of temperature in a car room by estimation of temperature in a car room in a transient state to an optimum and capable of realizing it by a simple and low-cost control system. <P>SOLUTION: The control device is provided with a controlled system output target value setting means; a controlled system output detecting means, a control input calculating means to calculate a control input inputted in a controlled system such that a control system output value is adjusted to a target value, a controlled system output target responding calculating means to calculate and assign a target response in a transient state in which a controlled system output value attains a target value, and a controlled system output feed back computing means to compute a deviation between a controlled system output target value in target response and a controlled system output value detected by the controlled system output detecting means. A controlled system output estimating means is provided to estimate a controlled system output value in a transient state reaching a target value based on a target response assigned by a controlled system output target response calculating means, estimation of a controlled system output value by the controlled system output estimating means is carried out by a computing formula to contain a time in a variable. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a control device,
It is especially suitable for an auto air conditioner system of a vehicle air conditioner, and while maintaining performance equal to or better than that of a conventional auto air conditioner, the component parts and control system can be greatly simplified, and as a vehicle air conditioner that can be implemented at low cost. It relates to an optimal control device.

[0002]

2. Description of the Related Art Generally, in an air conditioner for a vehicle equipped with an evaporator (cooler) and a heater (heater) in a ventilation duct, according to a set temperature, the evaporator and the heater are
By controlling the control amount of the air mix damper and taking various feedback signals into consideration, the target outlet temperature is controlled so that the target vehicle interior temperature is achieved. For example, in an automatic air conditioner, the target blow-out temperature is calculated by referring to the heat load detection values such as the vehicle interior temperature, the outside air temperature, the amount of solar radiation, and the evaporator outlet air temperature, and each control device (air mix damper, air mix damper, The blowout mode, the inside / outside air switching damper, etc.) are controlled.

[0003]

However, such a conventional auto air conditioner has many heat load detection sections and various temperature control device drive sections, and uses a complicated control system and arithmetic expressions. Therefore, it takes a lot of time and cost to configure the control system.

Further, especially when the set temperature is changed, the transient response of the blowout temperature may overshoot or undershoot. Especially, when a high blowout temperature that transiently overshoots (rises) occurs, it gives an occupant a discomfort. Sometimes. As described above, in the conventional control, since the change in the response of the vehicle interior temperature to the blowout temperature is not considered, the blowout temperature and the vehicle interior temperature may overshoot or undershoot.

Therefore, an object of the present invention is to optimally estimate the vehicle interior temperature in a transient state so as to prevent overshoot and undershoot of the vehicle interior temperature, thereby improving comfort and simplifying it. An object of the present invention is to provide an optimum control device for use in a vehicle air conditioner that can be realized by an inexpensive control system.

[0006]

In order to solve the above-mentioned problems, a control device according to the present invention sets a control target output target value setting means for setting a target value of a control target output value and an output value of the control target. Control target output detection means for detecting, control input calculation means for calculating the control input to be input to the control target so that the control target output value becomes the target value, and transient state for the control target output value to reach the target value Control target output target response calculation means for calculating and designating a target response in, and control target output for calculating a deviation between the control target output target value in the target response and the control target output value detected by the control target output detection means A control device comprising feedback calculation means, wherein the control target output value in a transient state reaching a target value based on the target response designated by the control target output target response calculation means A control object output estimating means for estimating, consisting of those and performing estimation of the controlled object output value of the controlled object output estimating unit by a calculation expression including a time variable.

In this control device, the control target output value in the control target output estimating means can be estimated by a first-order lag or an arithmetic expression approximate thereto.

A control device in a vehicle air conditioner according to the present invention comprises a vehicle interior temperature setting means for setting a vehicle interior temperature,
The vehicle interior temperature detecting means for detecting the vehicle interior temperature, the target outlet temperature calculating means for calculating the target air temperature of the air blown into the vehicle interior so that the vehicle interior temperature becomes the set temperature, and the temperature of the air blown into the vehicle interior Blow-out temperature control means for controlling, vehicle interior temperature target response calculation means for calculating and specifying a target response in a transient state for the vehicle interior temperature to reach a set temperature, vehicle interior target temperature at the target response and the vehicle interior A controller in an air conditioner for a vehicle, comprising a vehicle interior temperature feedback calculation means for calculating a deviation from a vehicle interior temperature detected by a temperature detection means, wherein the target specified by the vehicle interior temperature target response calculation means Equipped with vehicle interior temperature estimation means for estimating the vehicle interior temperature in a transient state up to the set temperature based on the response, and the vehicle interior temperature estimation by the vehicle interior temperature estimation means Consisting of those and performing the arithmetic expression including a time variable. Also in this control device, the estimation of the vehicle interior temperature by the vehicle interior temperature estimation means can be performed by a first-order lag or an arithmetic expression approximate to the first-order lag.

Further, in the control device for this vehicle air conditioner, the vehicle interior temperature estimating means has a plurality of first-order lags or arithmetic expressions approximate thereto, and the sum thereof can be used as the vehicle interior temperature estimated value. .

When the vehicle interior temperature estimating means has only a first-order lag or an arithmetic expression approximate to the first-order lag, it is preferable to set the time constant in the arithmetic operation within the range of 90 to 180 seconds. When there are a plurality of arithmetic expressions, for example, the vehicle interior temperature estimating means has two first-order lags or an arithmetic expression approximate thereto, and when the sum of these is used as the vehicle interior temperature estimated value, one primary lag or an approximation thereof. It is preferable that the time constant in the calculation is set in the range of 90 to 180 seconds, and the time constant in the other first-order lag or the calculation similar thereto is set in the range of 500 to 1000 seconds.

In the above-described optimum control device for the vehicle air conditioner according to the present invention, the response model to the target value, that is, the target response is automatically calculated and designated according to the set temperature. The feedforward amount required to achieve the above is calculated, the feedback control amount is added to the calculated value, and the control amount is corrected to a more appropriate control amount. This feedforward control amount is calculated by the vehicle interior temperature estimating means as an estimated vehicle interior temperature value in a transient state up to the set temperature. For example, this calculation is performed by a primary delay with an arithmetic expression including time as a variable. Alternatively, it is performed by an arithmetic expression that is close to it. A more desirable response characteristic without overshoot or undershoot is calculated by the first-order lag or an operation similar to it, and the vehicle interior temperature is controlled based on that, so overshoot or undershoot occurs in the actual vehicle interior temperature. Is prevented, and comfortable air conditioning control is realized.

In this control, basically, the signal to be fed back is only the detection signal by the vehicle interior temperature detecting means, and the whole is based on the feedforward control. Since it is not necessary to feed back many detection signals for calculation and control, the temperature inside the vehicle can be controlled based on an appropriate control amount signal with a simple control system. Or, while maintaining equal or better performance with respect to overshoot and undershoot, the control system can be greatly simplified and the cost can be significantly reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an equipment system diagram of a vehicle air conditioner as a control device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes the entire mechanical components of the vehicle air conditioner. At the inlet side of the ventilation duct 2, the air intake amount from the inside air introduction port 3 side and the outside air introduction port 4 side are provided. An inside / outside air switching damper 5 is provided to control the ratio with the air intake amount. The sucked air is sucked and pressure-fed in the duct 2 by the blower 7 driven by the motor 6.

An evaporator 8 as a cooler and a hot water heater 9 as a heater are provided downstream of the evaporator 8 in the ventilation duct 2. The engine cooling water 10 from the engine is circulated in the hot water heater 9 and is heated thereby.

The refrigerant circulated in the refrigerant circuit 11 is supplied to the evaporator 8 provided as a cooler. The refrigerant is
After being compressed by a fixed capacity compressor (compressor) 12 whose capacity can be variably controlled by clutch control and condensed by a condenser 13, the evaporator 8 is passed through a liquid receiver 14 and an expansion valve 15.
And is sucked into the compressor 12 from the evaporator 8. In the present embodiment, the operation of the compressor 12 is controlled via the control of the clutch controller 16.

An air mix damper 17 is provided immediately downstream of the hot water heater 9, and the amount of air passing through the heater 9 is adjusted by adjusting the opening degree of the air mix damper 17 operated by the air mix damper actuator 18. And the amount of air bypassed can be controlled.

The temperature-controlled air is supplied to each of the air outlets 19, 20,
21 (eg DEF, VENT, FOOT outlet)
Is blown into the passenger compartment through. Each outlet 19, 20,
The dampers 21, 23, and 24 are provided at 21, respectively.

Clutch controller 1 of the compressor 12
6. The air mix damper actuator 18 is controlled based on a signal from the main controller 25. A set temperature signal from a vehicle interior temperature setting device 26 and a detection signal from a vehicle interior temperature sensor 27 are input to the main controller 25. Further, in this embodiment, a cooler outlet air temperature sensor 28 is provided on the outlet side of the cooler 8 and a detection signal thereof is input to the main controller 25.

Using such a system, the control according to the present invention is performed, for example, as shown in FIG. A target value response model Tf from a preset initial value (for example, 25 ° C. at room temperature) to reach the set temperature target value according to a set temperature Tset (vehicle temperature target value) set by the vehicle interior temperature setting device 26. Is calculated by the vehicle interior temperature target response calculation means in the present embodiment by the two vehicle interior temperature estimation models Tf1 and Tf2 considering the response change of the vehicle interior temperature, and the vehicle interior temperature estimated value is calculated by the sum of the calculated values. The vehicle interior temperature target response value Tf is calculated. Tf = Tf1 + Tf2 Tf1 = (TL × Tset + Tc1 × Tf1 (previous value)) / (Tc1 + TL) Tf2 = (TL × Tset + Tc2 × Tf2 (previous value)) / (Tc2 + TL) Here, TL: control cycle Tc1, Tc2: vehicle This is a temperature responsiveness designation parameter. Note that Tf1 and Tf2 are approximate calculation formulas for the first-order delay calculation.

That is, as shown in FIG. 3, the vehicle interior temperature estimated value Tf which is the vehicle interior temperature target response value is Tf1 and Tf.
It is calculated as the sum of f2, and each vehicle interior temperature estimated value component Tf
1 and Tf2 are obtained as calculation values by a first-order lag or a calculation formula that approximates it. In these two first-order delay calculation formulas, the time constant in one first-order delay calculation is 9
It is preferable that the time constant is set in the range of 0 to 180 seconds and the time constant in the other first-order delay calculation is set in the range of 500 to 1000 seconds. In the example shown in FIG. 3, the time constant in one first-order delay calculation (calculation of Tf1) is set to 150 seconds, and the time constant in the other first-order delay calculation (calculation of Tf2) is set to 700 seconds. Here, the time constant means the time required to reach a 63.2% response.

As described above, by calculating the vehicle interior temperature estimated value Tf as the sum of the vehicle interior temperature estimated value components Tf1 and Tf2 having different time constants (two in the above example), more desirable response characteristics are obtained. Therefore, it becomes possible to more reliably prevent the occurrence of overshoot and undershoot in the control of the blowout temperature, which will be described later, and the vehicle interior temperature.

When the vehicle interior temperature estimating means has only one first-order delay calculation formula, the time constant in the calculation is preferably set in the range of 90 to 180 seconds.

As will be described with reference to FIG. 2 again, when the target outlet temperature Toc is calculated, the feedforward calculation value Toc1 of the target outlet temperature is calculated with respect to the vehicle interior temperature response target value Tf. Then, from the vehicle interior temperature response target value Tf and the actually detected vehicle interior temperature TR,
The feedback calculation value Toc2 of the target outlet temperature is calculated.

The target outlet temperature Toc is calculated as Toc = Toc1 + Toc2 by the sum of the feedforward calculated value Toc1 and the feedback calculated value Toc2 of these target outlet temperatures.

The opening AMD of the air mix damper is calculated on the basis of the calculation result of the target outlet temperature Toc. AMD = f (Toc) However, in the present embodiment, the signals of the heater inlet hot water temperature TW (generally detected as the engine cooling water temperature) and the evaporator outlet air temperature Te are used for this calculation. = F (Toc, TW, Te).

The calculated air mix damper opening signal (air mix damper position signal) AMD is output to the air mix damper actuator 18, and the opening of the air mix damper is actually controlled.

In such control, the target value response model corresponding to the set temperature is substantially calculated as a feedforward signal, and independently of that, feedback control using the detection signal from the vehicle interior temperature sensor 27 is performed. Since this is performed, the feedforward control signal is appropriately corrected by the feedback signal, and is made a sufficiently reliable signal as the control signal for the target outlet temperature. Moreover,
Substantially the only feedback is the signal of the vehicle interior temperature at that time, which is actually detected, so that comfortable air conditioning control can be realized with stability and responsiveness, even with an extremely simple control configuration. become.

Further, in the present embodiment, the target outlet temperature T
oc is used to calculate the cooler outlet air temperature TVI = f (Toc), and the cooler outlet air temperature TVII is calculated from the set temperature.
= F (Tset, RH) is calculated. RH is the target vehicle interior relative humidity and is given as a fixed set value. The lower one of TVI and TVII calculated in this way is set as the target value TV of the cold generator outlet air temperature, and the clutch control signal is output to the clutch controller 16 based on the TV. The clutch controller 16 controls the detected value Te of the cooler outlet air temperature to be the target value TV.

By controlling the clutch controller 16 based on the TV and controlling the operation of the compressor 12 in this way, the required minimum operation can be achieved and the energy saving characteristics can be improved. Become. Moreover, since the evaporation temperature of the refrigerant can be optimized, it is possible to further improve comfort in air conditioning.

[0030]

As described above, according to the control device of the present invention, particularly the control device for a vehicle air conditioner,
In particular, the vehicle interior temperature does not overshoot or undershoot, and it is possible to efficiently control the vehicle interior temperature to a desired vehicle interior temperature. Further, since it is possible to prevent overshoot and undershoot from occurring in the transient response of the blowout temperature, it is possible to prevent the passenger from feeling uncomfortable when these occur, and it is possible to maintain comfort.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.

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

FIG. 3 is a characteristic diagram showing estimation of vehicle interior temperature in the control of FIG.

[Explanation of symbols]

1 Air conditioner 2 ventilation ducts 6 motor 7 blower 8 Evaporator as a cooler 9 Hot water heater as a heater 10 engine cooling water 11 Refrigerant circuit 12 Fixed capacity compressor 13 condenser 14 Receiver 15 Expansion valve 16 clutch controller 17 Air Mix Damper 18 Air mix damper actuator 19, 20, 21 Outlet 22, 23, 24 damper 25 Main controller 26 Vehicle interior temperature setting device 27 Vehicle interior temperature sensor 28 Cooler outlet air temperature sensor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kei Sugawara             20, Kotobukicho, Isesaki-shi, Gunma Sanden shares             In the company F-term (reference) 3L011 AF02                 5H323 AA12 BB05 CB23 DA04 DB17                       EE05 FF01 HH02 KK10 MM06                       NN03 QQ03

Claims (7)

[Claims] 1. A control target output target value setting means for setting a target value of a control target output value, a control target output detecting means for detecting an output value of a control target, and a control target output value so as to be a target value. Control input calculation means for calculating a control input to be input to the control target, control target output target response calculation means for calculating and designating a target response in a transient state in which the control target output value reaches the target value, and the target response A control target output feedback calculation means for calculating a deviation between the control target output target value in and the control target output value detected by the control target output detection means,
Control target output estimation means for estimating a control target output value in a transient state up to a target value based on the target response specified by the control target output target response calculation means, and the control target output in the control target output estimation means A control device characterized in that a value is estimated by an arithmetic expression including time as a variable. 2. The control device according to claim 1, wherein the control target output value is estimated by the control target output estimating means by a first-order delay or an arithmetic expression approximate to the first-order delay. 3. A vehicle interior temperature setting means for setting a vehicle interior temperature, a vehicle interior temperature detection means for detecting a vehicle interior temperature, and a target air temperature of air blown into the vehicle interior so that the vehicle interior temperature becomes a set temperature. A target outlet temperature calculating means for calculating, a outlet temperature control means for controlling the temperature of the air blown into the passenger compartment, and a passenger compartment temperature for calculating and designing a target response in a transient state for the passenger compartment temperature to reach a set temperature Control in a vehicle air conditioner including target response calculation means and vehicle interior temperature feedback calculation means for calculating a deviation between the vehicle interior target temperature in the target response and the vehicle interior temperature detected by the vehicle interior temperature detection means A device for estimating a vehicle interior temperature in a transient state of reaching a set temperature based on a target response specified by the vehicle interior temperature target response calculating means. A control device for a vehicle air conditioner, comprising a step, wherein the vehicle interior temperature in the vehicle interior temperature estimating means is estimated by an arithmetic expression including time as a variable. 4. The control device for a vehicle air conditioner according to claim 3, wherein the estimation of the vehicle interior temperature by the vehicle interior temperature estimation means is performed by a first-order lag or an arithmetic expression approximate to the first-order lag. 5. The vehicle interior temperature estimating means according to claim 3, wherein the vehicle interior temperature estimating means has a plurality of first-order lags or an arithmetic expression approximate to the first-order lag, and uses the sum thereof as an estimated vehicle interior temperature value. Control device for air conditioner. 6. The vehicle interior temperature estimating means has a first-order lag or an arithmetic expression approximate to the first-order lag, and a time constant in the arithmetic operation is set within a range of 90 to 180 seconds.
Or the control device in the vehicle air conditioner of 4. 7. The vehicle interior temperature estimating means uses a sum of two first-order lags or an arithmetic expression approximate thereto as an estimated vehicle interior temperature value, and a time constant in one first-order lag calculation or an approximation calculation thereof is 90 to 180 seconds. The time constant in the other first-order lag calculation or its approximation is set to 5
The control device in the vehicle air conditioner according to claim 3 or 5, wherein the control device is set to a range of 00 to 1000 seconds.