JPS58199213A - Automotive air conditioner - Google Patents

Abstract

PURPOSE:To effectively get rid of any abnormal operation of an actuator when said abnormal condition is recognized, by a means which controls the actuator by computing a target position of the actuator on the basis of signals from a group of input means, by having the actuator make reverse motion. CONSTITUTION:Quantitative control of engine cooling water supplied in a heater core 8 which is disposed downstream from an evaporator 7 in an air passage 2 is performed by a water valve 15, which consists of forward and backward passage valves 17 and 18 controlled for opening in accordance with variation of the negative pressure in a diaphragm 16. The adjustment of negative pressure in the diaphragm 16 is performed by controlling hot and cool valvs 19 and 20 by means of a control circuit 31. Based on the real position signal from a position sensor 24, the control circuit 31 estimates whether the operation of the valve 15 is normal or not. If it is found abnormal, the control circuit takes an action for varying the control command signal so as to move the valve 15 in the reverse direction temporarily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for an automobile, and more particularly to an air conditioner for an automobile that, when an abnormality occurs in an actuator, makes efforts to relieve the abnormality so that the actuator can recover to a normal state. be.

Conventionally, actuators for automobile air conditioners (11
In the event of an air leak, the occupants would only be able to tell that the condition was normal if the blown air did not become hot or cold, or the air intake and outlet did not switch. In some cases, the abnormal state cannot be detected at all, and the abnormal operation continues undesirably, causing the actuator to be driven undesirably.

The present invention has been made in view of the above points, and is an air conditioner for an automobile in which, when an abnormality occurs in the actuator, an IJ attempt is made to release the abnormality so that the actuator can recover to a normal state. , it is intended to provide 12 services. Therefore, the automotive air conditioner of the present invention receives signals from a position sensor that detects the actual position of the actuator and a group of input means including the position sensor, calculates the target position of the 7 Kubuyu eater, and sends a control command signal to the actuator a1. In the automotive air conditioner equipped with a control circuit that outputs a
Based on the actual position signal from the position sensor, it is determined whether the actuator is operating normally or not, and if it is determined that there is an abnormality, the actuator is temporarily moved in the opposite direction. The present invention is characterized in that it is configured to perform processing to change an actuator control command signal to cancel the abnormality of the actuator.

The present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of an air conditioner for an automobile according to the present invention, which is of a reheat type.

In FIG. 1, an inside/outside air switching damper 5 is provided at a connecting portion between an air passage 2 of an air conditioner (air conditioner) 1, an outside air intake passage 3, and an inside air intake passage 4. The flow rate of the air selected and taken in by the blower 6 is selected by the blower 6, and then cooled by the evaporator f, heated by the heater core 8, and then passed through the outlet selected by the Suita switching damper 9. Cabin 1o
Inner L: u
Encased: 1 compressor 13 and refrigeration cycle 1
A refrigerant is supplied to the heater core 8 through the engine 11 cooling water or the shifter valve 15, respectively, to cool the air. and heat.

The two valves 15 have a configuration as shown in FIG. 2, and correspond to the respective positions of the outgoing valve 717 and the returning valve 18, which move vertically in the drawing as a body as the negative pressure of the diaphragm 16 changes. Then, the mixing ratio of the flow rate of dry water supplied from the resin 11 side to the heater core 8 side and the flow rate of cold water that is cooled while flowing inside the heater core 8 and is supplied to the heater core 8 side again is determined, ■Determine the overall temperature of the engine cooling water supplied.

The air intake passage of the go/flamm 16 is provided with a hot valve 19 that controls opening and closing of a communication passage with the engine air side (not shown) and a cool valve 2o that controls opening and closing of a communication passage with the atmosphere. There is. Further, a motor pump 21 is provided in a passage leading from the outward valve 17 to the heater core 8.

The air conditioner 1 is provided with various sensors for detecting operating conditions and atmospheric conditions, and condition indicating means for instructing operating conditions, and these input means are connected to a control circuit 32 as described below. provides data for humidity control. That is, the outside temperature information from the outside temperature sensor 22, the inside temperature information from the inside temperature sensor 27, the solar radiation information from the 8-point sensor 28, and the target temperature information from the humidity setting device 30 are used to calculate the required blowing temperature as described below. It is used as data, and after evaluation by the duct sensor 23, Wll? The engine cooling water temperature information from the water temperature sensor 26 is used together with the calculated required blowout temperature data to calculate the actuator's target stroke (target position), and the actual position information of the actuator from the position sensor 24 is used. Calculate the control amount for actuator J-Y with the target position data obtained]
It is used to Further, the negative pressure sensor 25, which is an example of a state detection means for detecting the operating state of the engine, uses its detected information, that is, pressure information, to determine the operating state of the actuator as described later.

Further, the switch panel 21), which is one of the condition indicating means, is used to indicate various operation modes, such as automatic operation mode, (dynamic operation mode, etc.).

Historically, the air conditioner 1 was provided with an abnormality indicator 31.
The abnormality indicator 31 is activated by the control circuit 32)! Rii
-, v I- If it is determined that there is an abnormality in the evening, the relevant fact will be displayed.

When the ignition switch 33 is operated and a constant voltage is applied by the power supply circuit 3-4, the 1111 circuit 32 operates the sensors/sensors under the conditions set by the two switch panels and the temperature setting device J10. )I L7) performs predetermined arithmetic processing based on the detection signal to control various drive means. Here, this first drive stage includes an inside/outside air switching damper driving means 35 that drives the inside/outside air switching damper 5;
f1 for driving the blower 6; water valve driving means 37 for driving the hot valve 19 and cool valve 20; blowout switching damper driving means 38 for driving the blowout switching damper 9; and the compressor 13 from the engine 11 as described above. There is a clutch 12 that connects and disconnects the transmission of driving force to.

Further, as will be described later, when a predetermined condition is satisfied after outputting the water valve control command signal, the control circuit 32 performs a determination process to determine whether the actual position of the water valve 15 matches the target position. If it is determined that there is an abnormality, efforts are made to remove the abnormality so that the water valve 15 can be restored to its normal state.

Next, the main parts of the processing operation by the control circuit 32 will be explained with reference to the flowchart of FIG.

When the ignition switch 33 is turned on, the control circuit 3
2 starts processing. Then the process progresses to step 10
1, step 101 is executed and input signals from the various sensor neck input means groups are sequentially taken in.

Next, step 102 is executed, and the required blowing temperature 7ao is calculated based on the various data taken in step 101. In calculating this temperature Tao, the following formula is used: rao = Ks - Ts - Kr - Tr - Kam -
Tag -Ksun -Tsun -C (However, KS 1Kr, KaIll, ) (sun
, C are constants, Ts is the set temperature or target humidity,
7r represents the temperature inside the vehicle, Tam represents the temperature outside the vehicle, and Tsum represents the intensity of solar radiation. ) is used. Also, in step 102, 0
The target stroke amount SW (target position) of the water valve 15 is calculated based on the obtained necessary blowout temperature Tao, the post-evaporation temperature information from the duct sensor 23, and the 1-engine cooling water temperature information from the water temperature sensor 26.

Next, step 103 is executed, and the target stroke amount SW screened in step 102 and the actual stroke amount SP (actual (position), that is, (SW-8P) is calculated. Here, for both the target stroke amount SW and actual stroke amount SP, 0% is MAX C00L, and 100% is MAX H.
Compatible with OT.

Next, step 104 is executed, and the hot valve (1-IV) is )19,'
y-71/c)L/'7 (C, V), it is determined whether 20 should be turned on, that is, open, or turned off, that is, closed. As is clear from the figure, the above control pattern is as follows:
For hot valve () (V) 19, deviation (SW-
8P> increases to 6% or more, the OFF state is reversed to the ON state and the temperature of the fluid passing through the heater core 8 is increased, while the deviation (SW-8
When P) decreases to 3% or less, the ON state is reversed to the OFF state so as to maintain the temperature of the fluid passing through the heater core 8. Also, cool valve (C
Regarding V) 20, when the deviation (SW-8P) increases to -6% or less, the temperature of the fluid passing through heater A8 is reduced by switching from the off state to the on state. On the other hand, when the deviation (SW-8P) decreases to -3% or more, the ON state is reversed to the OFF state so that the temperature of the fluid passing through the heater core 8 is maintained.

Next, step 105 is executed to determine whether the hot valve (HV) 19 or the cool valve (CV) 20 determined in step 104 belongs to the on region or is old.

Hot valve (HV) 19 or cool valve Cv) 20
If it belongs to the on region, then Stella 7106 is executed and an on command signal is output to the water valve driving means 37 to turn on the valve 19 or 20 that belongs to the on region.

Next, step 107 is executed, and if the timer is in the stopped state, the timer is started. As will be described later, this timer measures the time during which the actual position SP of the water valve 15 remains unchanged after the hot valve (IIV) 19 or the cool valve (CV) 20 is turned on.

Next, step 108 is executed, and it is determined whether the actual position SP of the water valve 15 has changed based on the actual position SP of the water valve 15 acquired in step 101 and the actual position acquired in the previous execution of step 101. .

If it is determined that the real position SP has changed, step 10
After clearing the above timer in step 9, if it is determined that the actual position SP has not changed, directly proceed to step 1.
10, in step 110, it is determined whether or not negative pressure is being generated normally based on the negative pressure signal from the negative pressure sensor 25 taken in in step 101.

If it is determined that negative pressure is not being generated normally, the program jumps to a subsequent program (not shown).

On the other hand, if it is determined that negative pressure is being generated normally, then step 111 is executed and it is determined whether the value of the timer is 30 seconds or more.

If the timer has not reached the end of 30 seconds, the program jumps to a subsequent program (not shown). -h timer value is 3
If it is determined that the time is 0 seconds or more, then step 112 is executed. In step 112, if the ON command signal is output for the hot valve (11V) 19 in step 106, it is determined whether the actual position SP belongs to a predetermined range, that is, a range from 9F)% to 105%. On the other hand, in step 106, an ON command signal is output for the cool valve (CV) 20. In this case, the actual position SP is within a predetermined range, that is, from -5% to +5%.
Determine whether it belongs to the range up to! IJru. In other words, this judgment process is performed by Hot Pal 7 (It V)
1. ．． When the ON command signal is output for 9 and at least 30 seconds have passed from C, the actual position SP is MA.
X It should have reached HOT, but actually M
It is determined whether the position has reached the vicinity of A
It is determined whether it has reached the vicinity of 0L.

Actual @sp is MAX Near HOT or MAX
The water valve 1 has reached the vicinity of C00L.
When it is determined that 5 is operating normally, the program jumps to a subsequent program (not shown). On the other hand, if it is determined that the water valve 15 is not operating normally, that is, that an abnormality has occurred, then step 113 is executed.

In step 113, it is determined whether the content of the release effort counter has reached "2". Here, the release effort counter is used to input the control command signal for a predetermined period of time, for example, 5 as will be described later.
It counts the number of times the data is inverted and output per second. Then, a subsequent program (not shown) is executed.

If the content of the release effort counter has not reached the end of "2", i.e. rOJ or "1", then step 114
The control command signal for the hot valve (HV) 19 and the control command signal for the cool valve (CV) 20 are maintained inverted for a predetermined period of time, for example, 5 seconds, in an effort to release the abnormal state of the water valve 15. This abnormal condition may include, for example, the valve being clogged with dirt, and the dirt may be removed from the valve by reversing the valve. Then, step 115 is executed and the contents of the release effort counter are incremented. On the other hand, if it is determined that the content of the release effort counter is ``2'' or more (゛),
Step 116, Stella 1117 and Step 118
are executed sequentially.

Immediately 4) Clear the release effort counter and issue the error display command 16.
The number is output to the abnormality display 31, and the hot balloon / (
IIV) An off command signal is output to the walk valve driving means 37 in order to turn off both the cool bar 19 and the cool bar/1,7 (CV) 20. Then, a subsequent program (not shown) is executed.

On the other hand, if it is determined in step 105 as described above that neither the hot valve (HV) 19 nor the cool valve <(]V) 20 belong to the ON region, then step 119 is executed to An off command signal is output to the (HV) 19 and/or the cool valve (CV) 20, and then step 120 is executed to stop and clear the above-mentioned timer. Then, a subsequent program (not shown) is executed.

In this way, in the flowchart shown in FIG. 3, the hot valve (IV) 19 or the cool valve (CV) 20
After the ON command signal is output to the actual position SP for at least 30 seconds while the negative pressure is operating normally.
If the ISP does not continue to change and the ISP does not match the target position, a release effort is made to invert the control command signal for 5 seconds. For example, if the actual position SP still does not change despite efforts, - the inverted output v for 5 seconds as described above.
& After 30 seconds have elapsed, a second release effort is made. This release effort is made twice at most in Figure 3. If it is determined that an abnormal state is still occurring in the water valve 15 despite two efforts to release it, the abnormality is displayed on the abnormality display 31 and the hot valve (HV119 and cool valve
) 20 are both turned off.

Control times: 1”δ with reference to the flowchart in Figure 3 above.
;U: The processing operation in step 2 has been explained, and next, it will be explained in more detail with reference to FIG.

The target stroke amount (target position) SW of the water valve is, for example, 60% and the actual stroke amount (large position) SP
When the temperature setting device 31 is operated at time T1 and the target amount SW is maintained at around 60%, the cool valve is activated. (CV) 20 is turned on, and the actual stroke ISP gradually approaches the target stroke amount SW of 40%. Then, at time T2 (the actual stroke amount SP is abbreviated as the target stroke amount sw, and the difference (SW-8P) comes to belong to the off region in the control 11 pattern as described above, the cool valve ( CV) 20 is reversed from on to off, and thereafter the actual stroke amount s[] of around 40% is maintained.

Thereafter, the target temperature setting is changed again at time T3, and [
When the one-mark stroke ISW is changed to 60%, an on command signal is output to the hot valve (HV) 19, and the hot valve (HV) 19 is turned on. Then, at time T4, for example, 30 seconds have passed since time T3, the hot valve (HV) 19 is switched off, the cool valve (CV) 20 is switched on, and this inverted state is continued for 5 seconds. In other words, make the first effort to cancel.

At time T5, after the 5 seconds have elapsed, only the hot valve (HV) 19 is turned on, and the on state is maintained for 30 seconds.

Then, at time T6 after 30 seconds have elapsed, a second release effort is made for 5 seconds. Then, at time T7, the hot valve (
Day 2) Only 19 is turned on and the on state is continued for 30 seconds. If the water valve is still in an abnormal state, a display command signal is output to the abnormality indicator 31 at the time point) to display the abnormality.

As explained above, the present invention includes a position sensor that detects the actual position of an actuator, and a control circuit that receives signals from a group of manual means including the position sensor, calculates the target position of the actuator, and outputs an actuator control command signal. In the automatic heavy-duty air conditioner that has been given the above, the control circuit has a function that determines whether the actuator is operating normally or is old, and determines that there is an abnormality based on the actual position signal from the position sensor. In order to temporarily move the actuator in the opposite direction, the actuator control command signal is changed;
The system was configured to eliminate the abnormality in the actuator mentioned above.

Therefore, when an abnormality in the actuator is determined, the actuator is temporarily moved in the opposite direction.This allows the actuator to temporarily move in the reverse direction. If this is the cause, the abnormality can be recovered by the abnormal Hp removal force, and normal operation can be resumed.

/-j “Oh, Tatsumi, it is desirable to display an abnormality indication when it is determined that it is normal or when efforts to escape from the abnormality have not been successful.

In the first embodiment, the actuator is a four-way valve, but other actuators may be used, such as an air mix damper in an air mix type air conditioner.

Further, the water valve may be of a motor type instead of the diaphragm type as described above.

[Brief explanation of the drawing]

Fig. 1 shows the configuration of an embodiment of an air conditioner for an automobile according to the present invention, Fig. 2 is a schematic configuration diagram of a water valve thereof, and Fig. 3
The figure shows a flowchart for explaining the main parts of the processing according to the present invention, and FIG. 4 shows a time chart for explaining more specifically. 1...Air conditioner 5...Inside/outside air switching damper 6...Blower 7...■ Baborator 8...
...Heater core 9...Blowout switching damper 15.
...Water valve 22...Outside temperature sensor 23...
- Sensor 24...Position sensor 25...Negative pressure sensor 26...Water humidity sensor 27
...Interior temperature sensor 28...Solar radiation sensor 29...
・Switch panel 30... Temperature setting device 31... Abnormality indicator 32... Control circuit 33... Ignition switch representative Patent attorney Tsutomu Ashioki Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] An air conditioner for an automobile, comprising a position sensor that detects the actual position of an actuator, and a control circuit that receives signals from an input means group including the position sensor, calculates a target position of the actuator, and outputs an actuator control command signal. In the device, the control circuit determines whether or not the actuator is operating normally based on the actual position signal from the position sensor, and if it determines that there is an abnormality, it temporarily moves the actuator in the reverse direction. An air conditioning liF for an automobile, characterized in that it is configured to perform a process of changing the actuator control command signal to cause the actuator to move, and to cancel an abnormality in the actuator.