JPH075013B2 - Failure display device and failure display device for automobile air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure display device and a vehicle air conditioner equipped with the failure display device, for example, failure of an actuator that drives a water valve, an air mix damper, or the like. Is suitable for detecting.

[Conventional technology]

It is widely known that a conventional failure display device uses a failure detection display such as disconnection, short circuit of various sensors, and motor lock.

In addition, a failure display device for an automobile air conditioner is disclosed in
As disclosed in Japanese Patent Laid-Open No. 58-141912, there is known one that detects a sensor failure by determining whether or not the magnitude of an output signal from the sensor is within a set range.

[Problems to be Solved by the Invention]

Further, conventionally, an air conditioner for an automobile that automatically controls an air mix damper, an inside / outside air switching damper, and an outlet switching damper is also widely known, but it is difficult to determine a failure of an actuator that drives these dampers. It was For example, the short-circuit or disconnection of the potentiometer that detects the position of the air mix damper could be detected by the conventional technology as described above, but the failure of the actuator does not appear as the damper position abnormality, and the air mix damper is in the normal position range. However, there are cases where the actuator fails and the damper is not driven, or the damper cannot be driven to a predetermined position.

The present invention has been devised in view of the above problems. That is, it is an object of the first invention of the present invention to reliably detect a failure of an actuator. Another object of the second invention of the present application is to improve the reliability of the air conditioner for a vehicle by using the failure display device for a failure display device of an air conditioner for a vehicle equipped with a temperature adjusting member.

[Means for Solving the Problems]

In the first invention of the present application, an actuator having the configuration shown in FIG. 5 capable of reversibly changing the position, a position sensor for detecting the actual position of the actuator, and a signal from an input means group including the position sensor are provided. Receiving a target position of the actuator, and outputting a control signal of the actuator, and a failure display device comprising: a absolute value of a difference between the actual position of the actuator detected by the position sensor and the target position. When the value exceeds a predetermined amount and continues for a predetermined period of time, a technical means is provided, which comprises a failure determination means for determining that the actuator has failed, and a failure display means for displaying a failure based on the determination of the determination means.

Further, in the second aspect of the present invention, a position interlocking with the cooling means, the heating means, the vehicle interior temperature sensor, the outside air temperature sensor, and the temperature adjusting member is particularly adapted to detect the failure of the temperature adjusting member of the automobile air conditioner. An air conditioner for a vehicle, which includes a control unit that takes in an electric signal from a sensor and controls the temperature adjusting member according to a difference between a vehicle compartment temperature and a target temperature, and automatically controls the vehicle compartment temperature to the target temperature. The target position calculating means for calculating the target position of the temperature adjusting member based on the passenger compartment temperature and the target temperature, the target position calculated by the calculating means, and the position sensor detected. When the absolute value of the difference from the detection position exceeds a predetermined amount and continues for a predetermined time, a failure determination unit that determines that the temperature control member is in failure, and a failure display based on the determination by the determination unit Adopt the technical means of and a failure display means that.

[Action]

According to the first aspect of the present invention, the target position of the actuator is calculated, and the actuator is controlled so that the actual position detected by the position sensor matches the target position.

Further, when the absolute value of the difference between the actual position of the actuator and the target position exceeds a predetermined amount and continues for a predetermined time, the failure of the actuator is determined and the display is performed.

Here, when controlling the actuator to the target position, the actual position of the actuator is controlled to the target position with a delay. Therefore, the absolute value of the difference between the actual position and the target position may exceed the predetermined amount even in the normal state of the actuator. However, in the first invention of the present application, when the absolute value of the difference between the actual position and the target position exceeds the predetermined amount and continues for the predetermined time, the actuator is judged to be in failure, and the malfunction due to the operation accuracy or the operation delay of the actuator may occur. Without determining the actuator failure.

In the second aspect of the present invention, the target position of the temperature adjusting member is calculated, and control is performed so that the actual position of the temperature adjusting member becomes the target position. Further, when the absolute value of the difference between the actual position of the temperature control member and the target position exceeds a predetermined amount and continues for a predetermined time, a failure of the temperature control member is determined and the display is performed.

Here, the position of the temperature adjusting member is controlled according to the deviation between the vehicle compartment temperature and the target temperature, and the actual position is controlled with a delay with respect to the calculation of the target position. Here, in the automobile air conditioner, the absolute value of the difference between the actual position of the temperature adjusting member and the target position frequently changes due to detection delays from various sensors, mechanical operation delays of the actuator function unit, and the like.
Therefore, an accurate determination cannot be made if the failure is determined only based on the absolute value of the difference between the actual position of the temperature adjusting member and the target position. However, in the present invention, when the absolute value of the difference exceeds the predetermined amount and continues for the predetermined time, the failure of the temperature adjusting member is determined, so that the failure is determined without causing malfunction due to the operation accuracy or operation delay of the temperature adjusting member. .

[Embodiment] An embodiment to which the present invention is applied will be described below with reference to the drawings.

FIG. 1 shows a reheat system of an embodiment of the air conditioner for a vehicle according to the present invention.

In FIG. 1, an inside / outside air switching damper 5 is provided at a connecting portion of an air passage 2 of an air conditioner (air conditioner) 1 with 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 5 is selected by the blower 6, is then cooled by the evaporator 7, is then warmed by the heater core 8, and is blown through the blowout port selected by the blowout switching damper 9 to the vehicle interior. Blown out within 10. Here, the evaporator 11 has an engine 11
The refrigerant is supplied by a compressor 13 whose driving force is supplied / interrupted via a clutch 12 and forms a part of a refrigerating cycle 14, and the heater core 8 is connected to an engine.
11 cooling waters are provided via a water valve 15 to cool and heat the air respectively.

The water valve 15 has a structure as shown in FIG.
The forward valve 17 and the dual valve 18 that move together in the vertical direction in the drawing as the negative pressure of the diaphragm 16 changes
The mixing ratio of the flow rate of hot water supplied from the engine 11 side to the heater core 8 side and the flow rate of cold water that is cooled while flowing in the heater core 8 and is supplied again to the heater core 8 side is determined according to each position of. , The overall temperature of the engine cooling water supplied to the heater core 8 is determined. Diaphragm
In the 16 air intake passages, a hot valve 19 for controlling the opening / closing of a communication passage with the engine intake pipe side (not shown) and a cool valve 20 for controlling the opening / closing of the communication passage with the atmosphere are provided. 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 an operating condition and an atmospheric condition, and condition instructing means for instructing an operating condition. These input means groups are temperature controlled by a control circuit 32 as described later. Supply data for. That is, the outside air temperature information by the outside air temperature sensor 22, the inside air temperature information by the inside air temperature sensor 27, the insolation information by the insolation sensor 28, and the target temperature information from the temperature setter 30 are data for calculating the necessary blowout temperature as described later. The post-evaporation temperature information by the duct sensor 23 and the engine cooling water temperature information by the water temperature sensor 26 are used together with the required blowout temperature data calculated to calculate the target stroke amount (target position) of the actuator, and the position The actual position information of the actuator by the sensor 24 is used together with the calculated target position data to calculate the control amount for the actuator. Further, the negative pressure sensor 25, which is an example of a state detecting means for detecting the operating state of the engine, is used to determine the operating state of the actuator as the detection information, that is, the pressure information, which will be described later.

The switch panel 29, which is one of the condition instructing means, is used to instruct various operation modes such as an automatic operation mode and a manual operation mode.

Further, the air conditioner 1 is provided with an abnormality indicator 31, and when the control circuit 32 determines that the actuator has an abnormality, the abnormality indicator 31 displays the fact.

When the ignition switch 33 is turned on and a constant voltage is applied by the power supply circuit 34, the control circuit 32 outputs a detection signal from the sensors under the conditions set by the switch panel 29 and the temperature setter 30. Based on the predetermined arithmetic processing, various driving means are controlled. Here, the driving means includes an inside / outside air switching damper driving means 35 for driving the inside / outside air switching damper 5, a blower driving means 36 for driving the blower 6, a water valve driving means 37 for driving the hot valve 19 and the cool valve 20, The blowout switching damper driving means 38 for driving the blowout switching damper 9 and the clutch 12 for disconnecting / connecting the driving force transmission from the engine 11 to the compressor 13 as described above are provided.

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

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

When the ignition switch 33 is turned on, the control circuit 32 starts processing. Then, when the process proceeds to reach step 101, step 101 is executed to sequentially receive the input signals from the various sensors or the input means group.

Next, step 102 is executed, and the required blowout temperature Tao is calculated based on the various data acquired in step 101.
In calculating this temperature Tao, the following equation is used: Tao = Ks.Ts-Kr.Tr-Kam.Tam-Ksun.Tsun-C (where Ks, Kr, Kam, Ksun, C are constants, and Ts is Set temperature or target temperature, Tr is vehicle interior temperature, Tam is vehicle exterior temperature, and Tsun is the intensity of solar radiation. In step 102, the target stroke amount SW (target position) of the water valve 15 is calculated based on the required outlet air temperature Tao calculated as described above, the post-evaporation temperature information by the duct sensor 23 and the engine cooling water temperature information by the water temperature sensor 26. .

Next, step 103 is executed, and the actual stroke amount SP (actual position) of the water valve 15 based on the target stroke amount SW calculated in step 102 and the signal from the position sensor 24 fetched in the input step 101. And the deviation (SW-SP) is calculated. Here, 0% of the target stroke amount SW and the actual stroke amount SP is MAX COOL, 100%
Is compatible with MAX HOT.

Next, step 104 is executed, and a hot valve (HV) 19 based on the control characteristics of the hot valve (HV) 19 and the cool valve (CV) 20 with respect to a predetermined control pattern as shown in the figure, that is, the deviation (SW-SP). Then, it is determined whether the cool valve (CV) 20 should be turned on or opened, or turned off or closed. As is clear from the figure, the above control pattern shows the deviation (SW-SP) for the hot valve (HV) 19.
Is increased to 6% or more, the previous OFF state is reversed to the ON state so that the fluid temperature is increased so as to pass through the heater core 8, while the deviation (SW-SP) is reduced to 3% or less. Then, the temperature of the fluid passing through the heater core 8 is maintained by reversing it from the on state up to the off state. As for the cool valve (CV) 20, when the deviation (SW-SP) increases to -6% or more, it is reversed from the previous OFF state to the ON state so that the temperature of the fluid passing through the heater core 8 is lowered. On the other hand, when the deviation (SW-SP) is reduced to -3% or more, the temperature of the fluid passing through the heater core 8 is maintained by reversing from the on state to the off state.

Next, step 105 is executed, and the hot valve (HV) 19 or the cool valve (CV) 20 determined in the above step 104 is executed.
Judge whether or not belongs to On Castle.

If the hot valve (HV) 19 or the cool valve (CV) 20 belongs to the ON castle, step 106 is executed next, and an ON command signal is issued to turn ON the valve 19 or 20 belonging to the ON castle. Output to the water valve drive means 37.

Next, step 107 is executed, and if the timer is in the stop state, the timer is started. Here, 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 (HV) 19 or the cool valve (CV) 20 is turned on.

Next, step 108 is executed, and the actual position SP of the water valve 15 fetched in step 101 and the previous step 10
1 Actual position SP based on the actual position captured by execution
Judge whether or not has changed.

If it is determined that the actual position SP has changed, the timer is cleared in step 109. On the other hand, if it is determined that the actual position SP has not changed, the process proceeds straight to step 110, and step 101 At, it is determined whether or not the negative pressure is normally generated based on the negative pressure signal from the negative pressure sensor 25 fetched in step 101.

When it is determined that the negative pressure is not normally generated, the program is skipped to the following program.

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

If the timer value has not yet reached 30 seconds, the program jumps to the subsequent program not shown. On the other hand, if it is determined that the timer value is 30 seconds or more, then step 112 is executed. In step 112, when the ON command signal is output for the hot valve (HV) 19 in step 106, the actual position SP is within a predetermined range, that is, 95% to 105%.
If the ON command signal is output for the cool valve (CV) 20 in step 106, it is determined whether the actual position SP is within a predetermined range, that is, -5%. Judge whether it belongs to the range up to + 5%. In other words, this judgment process is a hot valve (HV)
At least 30 after the ON command signal is output for 19
It is assumed that the actual position SP should have reached MAX HOT at the time when the seconds are connected, and it is judged whether or not it has actually reached near MAX HOT, while the ON command signal is output for the cool valve (CV) 20. The actual position is about MAX
Judge whether or not it has reached near COOL.

When it is determined that the actual position SP has reached near MAX HOT or MAX COOL, that is, that the water valve 15 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, an abnormality has occurred, then the tip 113 is executed.

In step 113, it is determined whether or not the content of the release effort counter has reached "2". Here, the release effort counter sends a control command signal for a predetermined time, for example, 5 as described later.
This is to count the number of times the process of reversing the second and outputting the result. Then, a subsequent program (not shown) is executed.

The content of the cancellation effort counter has not reached "2" yet. That is, if it is “0” or “1”, then step 114
Then, the control command signal for the hot valve (HV) 19 and the control command signal for the cool valve (CV) 20 are inverted and maintained for a predetermined period, for example, 5 seconds, and an effort is made to cancel the abnormal state of the water valve 15. Examples of this abnormal state include clogging of the valve with dust, and the valve may be reversed to remove dust from the valve. Then, step 115 is executed and the content of the release effort counter is incremented. On the other hand, when it is determined that the content of the release effort counter is "2" abnormal, step 116, step 117 and step 118 are sequentially executed. That is, the release effort counter is cleared, an error display command signal is output to the error display 31, and an OFF command signal is sent to the water valve driving means to turn off both the hot valve (HV) 19 and the cool valve (CV) 20. Output to 37. Then, a subsequent program (not shown) is executed.

On the other hand, if it is determined that neither the hot valve (HV) 19 nor the cool valve (CV) 20 has reached the ON region by executing step 105 as described above, then step 119
Is executed to output an OFF command signal to the hot valve (HV) 19 and / or the cool valve (CV) 20, and then step 120 is executed to stop and clear the timer described above. Then, a subsequent program (not shown) is executed.

As described above, in the flowchart shown in FIG. 3, under the condition that the negative pressure is normally operating after the ON command signal is output to the hot valve (HV) 19 or the cool valve (CV) 20. When the actual position SP does not change continuously for at least 30 seconds and the actual position SP does not match the target position, a releasing effort is made to continuously reverse the control command signal for 5 seconds. And, for example, if the actual position SP still does not change despite efforts,
After 30 seconds have passed after the reverse output for 5 seconds as described above, the second release effort is made. This release effort is a maximum of two times in FIG. When it is determined that the water valve 15 still has an abnormal state despite the two efforts to release it, the abnormality is displayed on the abnormality display 31 and the hot valve (HV) 19 and the cool valve (CV) are displayed. Turn both 20 off.

The processing operation of the control circuit 32 has been described above with reference to the flowchart of FIG. 3, but will be described more specifically with reference to FIG.

The target stroke value (target position) SW of the water valve is, for example, 60% and the actual stroke amount (actual position) SP is 60%.
Temperature setter at time T1 under conditions of close proximity
When 31 is operated and the target stroke amount SW is changed to 40%, for example, the cool valve (CV) 20 is turned on,
The actual stroke amount SP gradually approaches the target stroke amount SW of 40%. Then, at time T1, the actual stroke amount SP substantially matches the target stroke amount SW, and when the difference (SW-SP) belongs to the off region in the control pattern as described above, the cool valve (CV) 20 turns from on to off. The actual stroke amount SP around 40% is maintained thereafter.

After that, when the target temperature setting is changed again at time T3 and the target stroke amount SW is changed to 60%, the ON command signal is output to the hot valve (HV) 19 this time, and the hot valve (HV) 19 is turned on. Turned on. And from time T3, for example, 30
At the time T4 when the seconds have passed, the hot valve (HV) 19 is switched off and the cool valve CV) 20) is switched on, and this inversion state is continued for 5 seconds. That is, the first release effort is made.

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

And at the time T6 after 30 seconds have passed, the second release effort is made 5
Do it for a second. And at time T7 again hot valve (HV) 19
Only this is turned on, and the on state is continued for 30 seconds. And if there is still an abnormal condition in the water valve,
At special T8, the display command signal is output to the abnormality display 31 to display the abnormality.

In the embodiment described above, by the determination in step 105,
It is determined whether or not the absolute value of the difference between the target stroke SW and the actual stroke SP of the water valve exceeds a predetermined amount shown in step 104, and further, the timer is started in step 107 and the elapsed time is determined in step 111. ,
It is determined that the determination in step 105 has continued for a predetermined time.

Then, the abnormal process of steps 113 to 118 is performed,
In step 117, an abnormality is displayed.

In the above-described embodiments, the case where the actuator function built into the water valve is used has been described, but the actuator function may be provided outside the water valve. Further, as another actuator, for example, an air mix damper in an air mix type air conditioner may be operated.

Further, in the present embodiment, the water valve which is the temperature adjusting member according to claim 2 is applied, but as the actuator in the vehicle air conditioner, an inside / outside air switching damper or the like that switches the air introduction port of inside air and outside air of the vehicle is operated. It may be applied to an inside / outside air adjusting member to be operated or an air outlet adjusting member to actuate a blowout switching damper for switching the air outlets of FOOT, FACE and DEF of the vehicle.

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

Further, although the example of the actuator in the vehicle air conditioner is shown in the present embodiment, it goes without saying that the actuator is not limited to the vehicle air conditioner.

〔The invention's effect〕

As described above, according to the first aspect of the present invention, the failure of the actuator in the failure display device can be reliably determined regardless of the operation accuracy and the operation delay of the actuator,
Can be displayed.

Further, according to the second aspect of the present invention, it is possible to reliably determine and display the failure of the temperature adjusting member in the failure display device of the air conditioner for an automobile regardless of the operation accuracy and the operation delay of the temperature adjusting member. This causes the temperature control member to malfunction, causing the passengers to feel uncomfortable by operating the vehicle air conditioner at a lower temperature or vice versa without obtaining the desired temperature condition. It is possible to provide such a failure display device for an air conditioner for a vehicle that can prevent such problems.

[Brief description of drawings]

FIG. 1 is a 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.
FIG. 4 is a flow chart for explaining the main part of the processing according to the present invention, FIG. 4 is a time chart for more concrete explanation, and FIG. 5 is a block diagram of the present invention. 1 ... Air conditioner, 5 ... Inside / outside air switching damper, 6 ... Blower, 7 ... Evaporator, 8 ... Heater core, 9 ... Outlet switching damper, 15 ... Water valve, 22 ... Outside air temperature sensor, twenty three
...... Duct sensor, 24 …… Position sensor, 25 …… Negative pressure sensor, 26 …… Water temperature sensor, 27 …… Inside air temperature sensor, 28 ……
Solar sensor, 29 …… Switch panel, 30 …… Temperature setter, 3
1 …… Error indicator, 32 …… Control circuit, 33 …… Ignition switch.

Claims (2)

[Claims] 1. An actuator capable of reversibly changing its position, a position sensor for detecting the actual position of the actuator, a signal from an input means group including the position sensor, and calculating a target position of the actuator, And a control unit that outputs a control signal for the actuator, wherein the absolute value of the difference between the actual position of the actuator detected by the position sensor and the target position exceeds a predetermined amount and continues for a predetermined time. In this case, the failure display device is provided with: failure judgment means for judging that the actuator has failed; and failure display means for displaying a failure based on the judgment of the judgment means. 2. An electric signal from a cooling means, a heating means, a vehicle interior temperature sensor, an outside air temperature sensor, and a position sensor interlocking with a temperature adjusting member is taken in to obtain the temperature according to the difference between the vehicle interior temperature and the target temperature. It is used in an air conditioner for a vehicle, which comprises a control means for controlling an adjusting member and automatically controls the vehicle compartment temperature to the target temperature, and the target position of the temperature adjusting member based on the vehicle compartment temperature and the target temperature. When the absolute value of the difference between the target position calculating means for calculating the target position calculated by the calculating means and the detected position detected by the position sensor exceeds a predetermined amount and continues for a predetermined time, the temperature adjustment is performed. A failure display device for an air conditioner for a vehicle, comprising: failure determination means for determining a member as a failure; and failure display means for displaying a failure based on the determination by the determination means.