JPH0245211A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To enable fluctuations of an average temperature inside cabins to be suppressed regardless of any sudden change in the temperature around a temperature sensor by periodically holding, for a certain time, operation/stop mode following a temperature setting signal changed stepwise on account of variations in the output from cabin temperature sensors mounted on a train. CONSTITUTION:A controller 7 is provided with each circuit group, including four contact signal holding circuits 8 each of which consists of a self holding circuit using a relay, prepared for each of cooler units 16, 17, in the case of such an unit as generating a temperature setting signal which is changed stepwise by sequentially changing the closed state of plural contacts 3 to 6 of a temperature detector 2 serving as a temperature setting means, according to any change in a cabin temperature detected by a temperature sensor 1. In addition, alternately operating timer units 9, 11 are mounted therein so that operations of respective timer unit 9, 11 alternately excite and restore timer output relays 10, 12 attached to each group of holding circuits 8 every T/2 period. Thus, frequent repetition of operation/stop following rapid changes in temperature around the temperature sensor 1 can be prevented.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention controls the capacity of an air conditioning unit by changing its operation and stop modes based on the output signal of a temperature sensor that detects the temperature inside a vehicle. The present invention relates to an air conditioner for a vehicle being driven.

(Prior Art) FIG. 3 is a block diagram showing the configuration of a conventional vehicle air conditioner of this type. In the figure, a temperature sensor 1 provided at an appropriate position inside the vehicle is connected to a temperature detector 2 serving as a setting means. This temperature sensor 2 has contacts 3 to 6
By changing the closed states of these contacts in accordance with changes in the output of the temperature sensor 1, a stepwise changing temperature setting signal is generated and provided to the controller 7 as a control means. This controller 7 includes a control logic section 13 that inputs a temperature setting signal and outputs two logic signals, and output relays 14 and 15 that are each excited by these logic signals. The cooler unit 16 is operated by turning on the contact point of the output relay 15, and the cooler unit 17 is operated by turning on the contact point of the output relay 15.

Here, as shown in FIG.
The on state changes to the off state when l<t2<t3<t4). Therefore, for example, if the temperature inside the car is t
If the temperature is below 1°C, all contacts 3 to 6 will output a temperature setting signal in the off state, and if the temperature inside the vehicle exceeds t2°C, only contact 3 will output a temperature setting signal in the on state. , when the temperature inside the vehicle exceeds t4°C, all contacts 3 to 6 output a temperature setting signal in an on state. On the other hand, the control logic section 13
inputs these temperature setting signals and determines whether all contacts 3 to 6 are in the off state, only contact 3 is in the on state, or whether contact 3.
4, contacts 3.4.5 are on, or all contacts 3 to 6 are on, the operation time of the cooler unit 16, 17 varies depending on whether the cooler unit 16 or 17 is on, as shown in FIG. 0%, 25%, 50%, 75%, 1 for time
The output relays 14 and 15 are alternately energized so that the output becomes 00%, and the cooler units 16 and 17 are controlled to be operated and stopped via these relay contacts.

In this way, the method of switching the cooling capacity into five stages by controlling the operation and stopping of the cooler units 16 and 17 is an effective control method for varying the cooling capacity without using a variable frequency inverter or the like. Wata. In particular, 25
% operation had a dehumidifying effect by performing cooling operation without significantly lowering the temperature inside the car.

(Problem to be solved by the invention) Although the temperature inside a train car may vary greatly depending on the opening and closing of the doors or the number of passengers, the average temperature inside the train usually changes only gradually. . If the temperature sensor 1 described above is designed to detect the average temperature inside the vehicle, the fluctuation in the temperature inside the vehicle can be suppressed to a sufficiently low level by the control method described above.

However, the temperature around the temperature sensor 1 may fluctuate greatly due to an extreme imbalance in the occupancy rate or the like. In such a case, the operating mode of the cooler unit 16, 17 may cycle back and forth between 0% and 100%, causing large fluctuations in the temperature inside the vehicle.
The number of times the stop was switched could increase.

This invention was made to solve the above problems, and even if the temperature around the temperature sensor changes suddenly, the average temperature inside the car will fluctuate and the number of times the air conditioning unit will be switched on and off. An object of the present invention is to obtain an air conditioner for a vehicle that can suppress the air flow rate to a significantly low level.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a temperature sensor that detects the temperature inside a vehicle, a setting device that outputs a temperature setting signal that changes stepwise according to changes in the temperature detected by the temperature sensor, and a setting device that outputs a temperature setting signal that changes in steps according to changes in the temperature detected by the temperature sensor. a control means for operating the air conditioning unit under capacity control in operation and stop modes corresponding to the temperature setting signals of the $I;
The present invention is characterized by comprising operation mode holding means for periodically holding the operation and stop modes of the Jm means for a certain period of time.

(Function) In this invention, when the air conditioning unit is operated under capacity control in the operation/stop mode according to the temperature setting signal that changes stepwise, this operation/stop mode is maintained periodically for a certain period of time. Therefore, even if the temperature around the temperature sensor changes rapidly, fluctuations in the average temperature inside the vehicle and the number of times the air conditioning unit is switched between operating and stopping can be suppressed to a much lower level.

(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 3 indicate the same or corresponding elements, respectively.

The difference from the conventional device is that a contact signal holding circuit 8, a timer section 9.11, and a timer output relay 10.12 are added inside the controller 7. Here, the contact signal holding circuit 8 is a self-holding circuit using a relay, and the contacts 3 to 6 are
Of each signal path, 4 on the cooler unit 16 side,
Four pieces are provided on each side of the cooler unit 17. Further, timer sections 9 and 11 operate alternately, and timer output relays 10 and 12 respond to these timer sections 9 and 11, and are alternately energized and energized every T/2 time, as shown in FIG. He keeps coming back. Further, the a contacts of the timer output relays 10 each form a contact signal holding circuit 8 on the cooler unit 16 side, and the timer output relays 12
The a-contacts each form a contact signal holding circuit 8 on the cooler unit 17 side.

The operation of this embodiment configured as described above will be explained below.

As shown in FIG. 2, the timer output relays 10 and 12 are alternately energized and reset every T/2, which is obtained by dividing a constant period T (for example, 6 minutes) into two.

Now, suppose that the temperature inside the car is relatively low and only the contact 3 of the temperature □ detector 2 is in the ON state, and if the timer output relay 10 is energized in this state, the cooler unit 16 connected to this contact 3 The side contact signal holding circuit 8 is self-holding, and the output relay 14 is energized by 25% for a predetermined time. Therefore, the cooler unit 16 is operated at 25%.

Next, when the timer output relay 11 is energized while only the contact 3 of the temperature detector 2 is in the on state, the contact signal holding circuit 8 on the cooler unit 17 side connected to this contact 3 self-holds. Cooler unit 17 is also operated at 25%.

Next, during the period when the timer output relay 12 is energized,
When the temperature inside the vehicle rises and the contacts 4.5 are also turned on, the contact signal holding circuit 8 connected to these contacts also self-holds, and only the cooler unit 17 is operated at 75%. At this time, since the timer output relay 10 has been reset, the contact signal holding circuit 8 connected to the contacts 4 and 5 on the cooler unit 16 side does not self-hold, and therefore the cooler unit 16 continues to operate at 25%.

Next, when the timer output relay 10 is excited, if the contacts 3, 4.5 of the temperature detector 2 are in the on state and the contact 6 is in the off state, the cooler unit 16 is also operated at 75%. If the contact 6 is also turned on during this time, the cooler unit 16 shifts to 100% operation at this point, but the cooler unit 17 is maintained at 75% operation.

According to such a control method, the operation mode of the cooler unit 16 is only changed while the timer output relay 10 is energized, and conversely, the operation mode of the cooler unit 17 is changed only while the timer output relay 12 is energized. Since the driving mode is only changed during certain periods, even if the temperature around the temperature sensor 1 changes frequently, changes in the average temperature inside the vehicle can be kept low, and the number of times the cooler unit is started and stopped can be limited. Can be done.

In addition, in the above embodiment, the case where two cooler units are controlled is explained, but if a large number of cooler units are controlled by two
Even when divided into groups, the same capacity control operation can be performed.

In addition, in the above embodiment, the constant cycle T is divided into two and the running and stopping modes are held for an equal amount of time, but the operating mode may be held due to differences in the capacity of the cooler units, differences in the number of units divided into groups, etc. The time may be changed as appropriate.

Furthermore, providing a circuit that periodically maintains the operation and stop modes for a certain period of time is not applied only to two cooler units or two groups of cooler units, but also to one cooler unit. It goes without saying that the present invention can also be applied to three or more groups of cooler units.

By the way, in the above embodiment, in order to facilitate understanding, a relay circuit has been described, but it is also possible to construct a non-contact circuit using an IC or the like instead.

Further, although the above embodiment describes the control of the cooler unit, the present invention is not limited to this, and can be applied to other air conditioners including heating operation.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the operation and stop modes according to the temperature setting signal that changes stepwise are maintained periodically for a certain period of time, so that the temperature around the temperature sensor is maintained. Even if there is a sudden change, fluctuations in the average temperature inside the vehicle and the number of times the air conditioning unit is switched between operating and stopping can be suppressed to a much lower level.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a time chart for explaining the operation of the main elements of the same embodiment, FIG. 3 is a block diagram showing the configuration of a conventional vehicle air conditioner, and FIG. 4 is a time chart for explaining the operation of the device. The chart and FIG. 5 are explanatory diagrams for explaining the operations of the main elements of the device. 1...Temperature sensor, 2...Temperature detector, 3-6...
・Contact, 7...Controller, 8...Contact signal holding circuit,
9.11...Timer section, 10.12...Timer output relay, 13...Control logic section, 14.15...Output relay, 16.17...Cooler unit.

Claims (1)

[Claims] A temperature sensor that detects the inside temperature of the vehicle, a setting means that outputs a temperature setting signal that changes in stages according to changes in the temperature detected by this temperature sensor, and operation and stop modes that respectively correspond to the temperature setting signal of this setting means. 1. An air conditioner for a vehicle, comprising a control means for operating an air conditioning unit under capacity control, and an operation mode holding means for periodically holding the control means in an operation or stop mode for a certain period of time.