JPS635286B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an air conditioner for an automobile, in particular, a system for easily detecting the occurrence of an abnormality in an actuator when negative pressure is being normally supplied to the actuator. The present invention relates to an air conditioner for automobiles.

[Prior Art] Conventionally, when an abnormality occurs in the actuator of an automobile air conditioner, the air being blown out does not become hot or cold, or the air intake and outlet are not switched, which may cause the passenger to be affected for the first time. was able to detect an abnormality. However, in some cases, the abnormal state cannot be detected at all, and the abnormal operation continues undesirably and the actuator continues to be driven undesirably, which is undesirable.

[Object of the invention] The present invention has been made in view of the above points,
The occurrence of an abnormality in the actuator can be easily detected, and the occurrence of an abnormality can be detected in a state where negative pressure is normally supplied to the actuator, and when the actuator is normal and negative pressure is not supplied. It is an object of the present invention to provide an air conditioner for an automobile that does not detect abnormal occurrences.

[Configuration of the Invention] As shown in FIG. 5, the configuration of the present invention to achieve the above object includes an actuator M1 that is operated according to the operating state of the engine, and a position sensor that detects the actual position of the actuator M1. An air conditioner for an automobile, comprising a control circuit M4 that receives a signal from an input means group M3 including the position sensor M2, calculates a target position of the actuator M1, and outputs an actuator control command signal, the engine state detection means M for detecting the operating state of
5 and an abnormality indicator M6, and the control circuit M4 is in a state of determining whether or not engine negative pressure is normally supplied as a power source to the actuator M1 based on a detection signal of the state detection means M5. a judgment means M7; a coincidence judgment means M8 for judging whether or not the target position of the actuator M1 matches the actual position detected by the position sensor M2; When it is determined that the pressure is normal and the coincidence determining means M8 determines that the target position and the actual position do not match, output a display signal to indicate an abnormality on the abnormality indicator M6. The gist of the present invention is an air conditioner for an automobile, which is characterized by being provided with an abnormality determining means M9 that performs the following steps.

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

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

In Figure 1, air conditioner (air conditioner) 1
An inside/outside air switching damper 5 is provided at the connection between the air passage 2 and the outside air intake passage 3 and inside air intake passage 4. Then, the air is cooled by the evaporator 7 , heated by the heater core 8 , and blown into the vehicle interior 10 through the outlet selected by the blow-off switching damper 9 . Here, the driving force of the engine 11 is applied to the evaporator 7 by the clutch 1.
Refrigerant is supplied to the heater core 8 by a compressor 13 that is supplied and shut off via the compressor 2 and is part of the refrigeration cycle 14, and cooling water for the engine 11 is supplied to the heater core 8 via a water valve 15. are used to cool and heat the air, respectively.

The water valve 15 has a configuration as shown in FIG. 2, and the water valve 15 has a structure as shown in FIG. The mixing ratio between the flow rate of hot water supplied from the heater core 8 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 then supplied to the heater core 8 side again is determined, and the mixture ratio is determined, and the mixture ratio is determined. Determine the overall temperature of the engine coolant. In the air intake passage of the diaphragm 16,
A hot valve 19 that controls opening and closing of a communication path with the engine intake pipe (not shown) and a cool valve 20 that controls opening and closing of a communication path with the atmosphere are provided. Further, a motor pump 21 is provided in a passage leading from the outgoing 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 correspond to the input means group M3 and perform control as described below. Provides data for temperature control by circuit 32. 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 solar radiation sensor 28, and the target temperature information from the temperature setting device 30 are data for calculating the required blowing temperature as described later. Also, the post-evaporation temperature information from the duct sensor 23 and the engine cooling water temperature information from the water temperature sensor 26 are used together with the calculated necessary blowout temperature data to calculate the target stroke amount (target position) of the actuator. The actual position information of the actuator from the position 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 the state detecting means M5 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.

Also, the switch panel 2, which is one of the condition instruction means,
9 is used to instruct various driving modes, such as automatic driving mode and manual driving mode.

Furthermore, the air conditioner 1 is provided with an abnormality indicator 31, which displays an abnormality when the control circuit 32 determines that there is an abnormality in the actuator.

When the ignition switch 33 is turned on and a constant voltage is applied by the power supply circuit 34, the control circuit 32 detects the detection from the sensors under the conditions set by the switch panel 29 and temperature setting device 30. It performs predetermined arithmetic processing based on the signals and controls various driving means. Here, this driving means includes an inside/outside air switching damper driving means 35 that drives the inside/outside air switching damper 5, a blower driving means 36 that drives the blower 6, a water valve driving means 37 that drives the hot valve 19 and the cool valve 20, and a blower. There is a blowout switching damper driving means 38 that drives the switching damper 9, and a clutch 12 that connects and disconnects the transmission of driving force from the engine 11 to the compressor 13 as described above.

Further, as will be described later, the control circuit 32 outputs a water valve control command signal, and when it is determined that the negative pressure is normal and a predetermined condition is satisfied, the actual position of the water valve 15 changes to the target position. A judgment process is performed to judge whether or not they match, and if it is judged that there is an abnormality, at least a display command signal is output to the abnormality indicator 31, and the abnormality indicator 31 is made to display that an abnormality has occurred.

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 32 starts processing. When the process progresses and reaches step 101, step 101 is executed to sequentially take in input signals from the various sensors, ie, input means group.

Next, step 102 is executed to determine the required blowing temperature based on the various data acquired in step 101.
Calculate Tao. When calculating this temperature Tao,
The following formula: Tao=Ks・Ts−Kr・Tr−Kam・Tam−Ksun・
Tsun-C (where Ks, Kr, Kam, Ksun, and C are each constant, Ts is the set temperature or target temperature, Tr is the vehicle interior temperature, Tam is the exterior temperature of the vehicle, and Tsun is the intensity of solar radiation.) use In addition, in step 102, the required blowout temperature Tao calculated as above and the duct sensor 23 are
The stroke amount SW (target position) of the water valve 15 is calculated based on the after-evaporation temperature information obtained by the evaporator and the engine cooling water temperature information obtained by the water temperature sensor 26.

Next, step 103 is executed, and the actual stroke amount SP of the water valve 15 (actual position ), that is, (SW−
SP). Here, both the target stroke amount SW and the actual stroke amount SP are 0% MAX COOL,
100% corresponds to MAX HOT.

Next, step 104 is executed to create a predetermined control pattern as shown in the figure, that is, the deviation (SW-SP)
Based on the control characteristics of the hot valve (HV) 19 and cool valve (CV) 20, it is determined whether the hot valve (HV) 19 and the cool valve (CV) 20 should be turned on, that is, open, or turned off, that is, closed. As is clear from the figure, the above control pattern reverses the hot valve (HV) 19 from the OFF state to the ON state when the deviation (SW-SP) increases to 6% or more, and turns the heater core 8 on. Try to increase the temperature of the passing fluid, while the deviation (SW-SP) is 3%
When the temperature decreases to below, the ON state is reversed to the OFF state to maintain the temperature of the fluid passing through the heater core 8. Regarding the cool valve (CV) 20, when the deviation (SW-SP) increases to -6% or less, the heater core 8 is turned from the OFF state to the ON state.
The temperature of the fluid passing through the heater core 8 is lowered, and when the deviation (SW-SP) decreases to -3% or more, the current on state is reversed to the off state and the temperature of the fluid passing through the heater core 8 is maintained. I'll do what I do.

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.

If the hot valve (HV) 19 or the cool valve (CV) 20 belongs to the ON region, then step 106 is executed and the ON command signal is used to drive the water valve to turn on the valve 19 or 20 belonging to the ON region. Output to means 37.

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 (HV) 19 or the cool valve (CV) 20 is turned on.

Next, execute step 108 and check the actual position SP of the water valve 15 taken in step 101 above.
It is determined whether the actual position SP has changed based on the actual position taken in by the previous execution of step 101.

If it is determined that the actual position SP has changed, the above-mentioned timer is cleared in step 109, and on the other hand, if it is determined that the actual position SP has not changed, the process directly proceeds to step 110. In step 101, it is determined whether or not negative pressure is being generated normally based on the negative pressure signal from the negative pressure sensor 25, which corresponds to the state detection means M5, taken 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 generated normally,
Next, execute step 111 and the value of the above timer will be 30.
Determine whether it is longer than seconds.

If the timer value has not yet reached 30 seconds, the program jumps to a 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 this step 112, the hot valve (HV) is
When the ON command signal is output for step 19, it is determined whether the actual position SP belongs to a predetermined range, that is, from 95% to 105%, and on the other hand, in step 106, the cool valve (CV) is turned on. When the ON command signal is output for 20, the actual position
It is determined whether SP belongs to a predetermined range, that is, from -5% to +5%. In other words, this judgment process determines that the actual position SP is at the maximum when at least 30 seconds have elapsed since the ON command signal was output for the hot valve (HV) 19.
Actually as it should have reached HOT
Determine whether it has reached the vicinity of MAX HOT,
On the other hand, when the ON command signal is output for cool valve (CV) 20, the actual position is MAX.
Determine whether it has reached the COOL neighborhood.

Actual position SP is near MAX HOT or MAX
When it is determined that the temperature has reached near COOL, that is, the water valve 15 is operating normally,
Jump 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,
Next, 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 counts the number of times a control command signal is inverted for a predetermined period of time, for example, 5 seconds, and then output, as will be described later. Then, a subsequent program (not shown) is executed.

If the content of the release effort counter has not reached the final value of "2", that is, it is "0" or "1", then step 114 is executed and the hot valve (HV) 1 is
Control command signal and cool valve (CV) for 9
The control command signal for the water valve 20 is 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, steps 116, 117, and 118 are executed in sequence. That is, the release effort counter is cleared, an abnormality display command signal is output to the abnormality display 31, and an off command signal is sent to the water valve driving means 37 to turn off both the hot valve (HV) 19 and the cool valve (CV) 20. Output to. Then, a subsequent program (not shown) is executed.

On the other hand, by executing step 105 as described above, the hot valve (HV) 19 and the cool valve (CV)
If it is determined that none of the valves 20 belong to the ON region, 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 the next step is executed. Step 120 is then executed to stop and clear the timer described above. Then, a subsequent program (not shown) is executed.

In this way, in the flowchart shown in FIG. 3, after the ON command signal is output to the hot valve (HV) 19 or the cool valve (CV) 20, under the condition where the negative pressure is operating normally. If 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 release effort is made to keep the control command signal in the inverted state for 5 seconds. For example, if the actual position SP still does not change despite your efforts, after 5 seconds of reverse output as described above,
A second release effort should be made after 30 seconds have elapsed. This release effort is made twice at most in Figure 3. If it is determined that the water valve 15 is still in an abnormal state despite two attempts to release it, the abnormality indicator 3
1 to indicate an abnormality, and both the hot valve (HV) 19 and the cool valve (CV) 20 are turned off.

The processing operation of the control circuit 32 has been described above with reference to the flowchart of FIG. 3, and will now be described in more detail with reference to FIG.

The temperature setting device 30 is operated at a time THz under the condition that the target stroke amount (target position) SW of the water valve is, for example, 60% and the actual stroke amount (actual position) SP is maintained around 60%. When the target stroke amount SW is changed to, for example, 40%, 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 T ₁ , the actual stroke amount SP approximately matches the target stroke amount SW,
When the difference (SW-SP) comes to belong to the off region in the control pattern as described above, the cool valve (CV) 20 is reversed from on to off,
From then on, the actual stroke amount SP is maintained at around 40%.

After that, at time _T2 , the target temperature setting is changed again and the target stroke amount SW is changed to 60%.This time, an ON command signal is output to the hot valve (HV) 19, and the hot valve (HV) 1 is turned on.
9 is turned on. Then, at time _T4 , for example, 30 seconds have passed since time _T3 , the hot valve (HV) 19 is switched off and the cool valve (CV) 20 is turned off.
Switch on and continue this inversion state 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, after 30 seconds have elapsed, a second release effort is made for 5 seconds at T ₆ . Then, at time _T7 , only the hot valve (HV) 19 is turned on again, 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 time _T8 to display the abnormality.

Here, in the above embodiment, the state detection means M
5, a negative pressure sensor is used to directly detect the negative pressure, but the detection signal from the circuit that detects the rotation signal that electrically controls the engine or the rise of the alternator's output voltage and turns off the charge lamp. It goes without saying that the same effect can be obtained by inputting the negative pressure to detect the negative pressure.

Further, in the above embodiment, the actuator is a water valve, but other actuators, such as an air mix damper in an air mix type air conditioner, may be used.

[Effects of the Invention] As described in detail above, in the automobile air conditioner of the present invention, as shown in FIG. A control circuit M4 for calculating a target position of the actuator M1 by receiving a signal from an input means group M3 including the position sensor M2 and outputting an actuator control command signal. In the air conditioner, condition detection means M for detecting the operating condition of the engine
5 and an abnormality indicator M6, and the control circuit M4 is in a state of determining whether or not engine negative pressure is normally supplied as a power source to the actuator M1 based on a detection signal of the state detection means M5. a judgment means M7; a coincidence judgment means M8 for judging whether or not the target position of the actuator M1 matches the actual position detected by the position sensor M2; When it is determined that the pressure is normal and the coincidence determining means M8 determines that the target position and the actual position do not match, output a display signal to indicate an abnormality on the abnormality indicator M6. The present invention is characterized in that it is provided with an abnormality determining means M9 for determining the abnormality.

Therefore, according to the present invention, even if an abnormality occurs in the actuator M1 while engine negative pressure is being normally supplied, this can be easily and accurately detected, and the abnormality indicator M6 will indicate this fact. The driver can be notified, and it is possible to take measures against the occurrence of an abnormality, such as stopping the power supply to the water valve to protect the device.

[Brief explanation of the drawing]

FIG. 1 is a configuration of an embodiment of an automotive air conditioner according to the present invention, FIG. 2 is a schematic configuration diagram of a water valve thereof, and FIG. 3 is a flowchart for explaining the main parts of the process according to the present invention. FIG. 4 shows a time chart for more specific explanation, and FIG. 5 shows a block diagram showing the configuration of the present invention. M1... Actuator, M2, 24... Position sensor, M3... Input means group, M4, 32
...control circuit, M5 ...state detection means, M6,3
1...Abnormality indicator, M7...Status judgment means, M8
...Concordance judgment means, M9...Abnormality judgment means, 1...
...Air conditioner, 5...Inside and outside air switching damper,
6...Blower, 7...Evaporator, 8...Heater core, 9...Blowout switching damper, 15...Water valve, 22...Outside temperature sensor, 23...
Duct sensor, 25...Negative pressure sensor, 26...Water temperature sensor, 27...Interior temperature sensor, 28...Solar radiation sensor, 29...Switch panel, 30...Temperature setting device, 33...Ignition switch.

Claims (1)

[Scope of Claims] 1. An actuator that is operated according to the operating state of the engine, a position sensor that detects the actual position of the actuator, and an actuator that receives signals from an input means group that includes the position sensor, An air conditioner for an automobile is provided with a control circuit that calculates a target position and outputs an actuator control command signal, and the control circuit is provided with a state detection means for detecting the operating state of the engine and an abnormality indicator, a state determining means for determining whether or not engine negative pressure is normally supplied as a power source to the actuator based on a detection signal from the detecting means; a coincidence judgment means for judging whether or not the target position and the actual position match; and a coincidence judgment means for judging whether or not the target position and the actual position match; An air conditioner for an automobile, comprising: abnormality determining means for outputting a display signal for displaying an abnormality on the abnormality indicator when it is determined that the abnormality has occurred. 2. The air conditioner for an automobile according to claim 1, wherein the target position used by the coincidence determination means is determined close to the limit point of the operating range of the actuator.