JP2906481B2 - Automotive air conditioners - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an automobile in which a control mode when an engine is turned on after an engine is turned off and an air conditioning operation is restarted is improved.

[Related Art] In an air conditioner for a vehicle, an air compressor included in the air conditioner is driven by an engine for the vehicle. Therefore, the air conditioner is also turned on / off along with the engine on / off control.

An air conditioner for a vehicle includes an outside air temperature sensor for detecting an outside air temperature and an indoor temperature sensor for detecting a vehicle interior temperature. The indoor temperature sensor is installed in a control panel of an air conditioner set on a dashboard, for example. For the outside temperature sensor, for example, immediately after the engine is stopped, various measures against heat radiation have been considered, but no treatment is usually applied to the indoor temperature sensor.

However, when the temperature is low in winter or the like, the heat of the heater for indoor heating accumulates inside the instrument panel or the like, and the components inside the instrument panel are set in a high temperature environment higher than the actual room temperature. Also, if the indoor temperature sensor is installed integrally with the control panel, the engine is stopped,
When the aspirator that acts on the indoor temperature sensor to blow indoor air stops, immediately after the aspirator stops, the control panel rises under the influence of the lighting lamp and the heat source such as the internal amplifier, and the temperature rises. The temperature detected by increases. Therefore, when the engine is restarted after the engine is stopped and after a short time period in which the ambient temperature does not decrease, the room temperature detected by the room temperature sensor detects a temperature higher than the actual room temperature. Therefore, when the engine is restarted and the air conditioner is also restarted with the start of the engine, the detected temperature of the room temperature sensor at that time is higher than the actual room temperature. Control that is lower than the required air conditioning temperature is performed. For example, when used in winter, when the engine is restarted, hot air output should be obtained, but hot air cannot be obtained from the heat outlet at the feet, and low-temperature air is supplied from the ventilator outlet at the top There is a disadvantage that the air conditioning control is started.

In addition, in summer or the like, the temperature of the dash panel portion may significantly increase due to solar radiation, and a temperature much higher than the actual room temperature may be detected by the indoor temperature sensor, and normal air conditioning control may be hindered.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and it is considered that an engine is stopped in a state where an air conditioner is set to an operating state, and then the engine is restarted. Even in such a case, it is an object of the present invention to provide an air conditioner for a vehicle in which the air conditioning control is reliably executed in response to the indoor temperature at the time of restart.

[Means for Solving the Problems] In the automotive air conditioner according to the present invention, the air conditioner control is performed according to the output of the indoor temperature sensor. Also,
Stores and sets the indoor temperature detected by the indoor temperature sensor in response to the engine off control, and when the engine is started, it corresponds to the time elapsed since the engine was turned off or the engine cooling water temperature element. The storage value of the temperature information stored in the temperature storage means is corrected, and the air conditioner control is executed based on the corrected storage value.

[Operation] In the automotive air conditioner configured as described above, immediately after the engine is stopped, the detected temperature of the indoor temperature sensor rises due to various factors, and the detected temperature from this sensor increases upon restart. However, in a state where the temperature is higher than the actual room temperature, the temperature information for control is determined based on the elapsed time since the engine was stopped or the engine coolant temperature and the stored room temperature information when the engine was stopped. Air conditioning control is performed based on the calculated temperature information. Therefore, the air-conditioning control is restarted from the air-conditioning control approximate to the room temperature when the engine is stopped, and the heating control corresponding to the actual room temperature state is restarted.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration, which is provided with an engine on / off detecting means 11. The detecting means 11 detects an operation command of on or off control corresponding to starting and stopping of an automobile engine (not shown). Further, this air conditioner includes an indoor temperature detecting means 12 set in a control panel of the air conditioner, for example.

An off detection signal from the on / off detection means, which accompanies the engine off control, is supplied as a storage command to the indoor temperature detection storage means 13, and when the engine is controlled to stop, a signal from the indoor temperature detection means 12 at that time. Temperature information is detected and stored as control temperature information. Further, the ON control control detection signal from the ON / OFF detection unit 11 is supplied to the elapsed time calculation unit 14. In this detecting means, the elapsed time from when the engine is stopped (off) controlled to when it is restarted (on) is calculated from a timer or a cooling water temperature drop state. It is supplied to the control temperature calculation means 15.

The control temperature calculating means 15 calculates temperature information for control based on the stored temperature information and the detected temperature information from the temperature detecting means 12 at that time together with the elapsed time from when the engine was turned off. The temperature control of the automotive air conditioner is executed in the air conditioner control means 16 based on the temperature information obtained.

FIG. 2 shows a basic configuration of the air conditioner, which is provided with a microcomputer 17 for control, and also has an indoor temperature sensor.
181, outdoor temperature sensor 182, sensors such as solar radiation sensor 183,
And a temperature setting device 19. And sensors 181-1
The detection signal from 83 and the set temperature information from the temperature setting device 19 are converted into digital signals by the A / D converter 20 and supplied to the microcomputer 17. Then, the microcomputer 17 executes temperature control of the air conditioner. In this case, the microcomputer 17 is supplied with an engine on / off signal generated in response to operation of an engine ignition switch or the like, for example.

FIG. 3 shows the flow of control in the microcomputer 17. First, in step 101, an initial setting is performed in accordance with start control of the engine. At the time of the initial setting, the flag F indicating that the correction control of the detection signal by the inside air temperature sensor is to be performed is set to “0”, and the timer TIM is started.

In the next step 102, an input routine is executed. In this input routine, a detection signal Tr of the vehicle interior temperature from the interior temperature sensor 181 is read. In step 103, it is determined whether or not the engine that has been set to the ON state has been turned off. If it is determined in step 103 that the engine that has been on has been turned off, the process proceeds to step 104 to execute a storage routine. In this storage routine, the detected temperature Tr at that time is stored and held as the control reference temperature Tro, and this processing ends.

If it is determined in step 103 that the engine has not been turned off, the process proceeds to step 105. In this step 105, the detected temperature Tr and the stored reference temperature Tro
And when it is determined that “Tr> Tro”,
It is determined that the room temperature sensor 181 is in a state of detecting a temperature higher than the actual room temperature, and the process proceeds to step 106. Then, in a step 106, it is determined whether or not the flag F is "1".
If it is determined that “F = 1”, the routine proceeds to step 107, where the reference temperature Tro is increased at a constant gradient. Specifically, a value obtained by multiplying the constant a by the elapsed time by the timer TIM is added to the temperature Tro so far. For example, 2 ° C for 1 minute
Set the constant a so that it rises, and use the timer TI
If M is assumed to elapse in minutes, a is set to “2”.

Then, in the next step 108, the temperature Tr is set to the new reference temperature T.
The air conditioner control is executed based on the temperature information Tro in step 109, and the process returns to step 102 through step "in".

If it is determined in step 106 that the flag F is not "1", the process proceeds to step 110. In this step 110, the elapsed time since the engine was turned off is calculated based on the engine cooling water temperature, and when the cooling water temperature is higher than, for example, 50 ° C., the elapsed time since the engine stopped is short. And judge. In this state, it is determined that the temperature of the indoor temperature sensor section has detected a temperature higher than the actual room temperature depending on the ambient environment conditions.

Then, in step 110, a state in which the temperature Tr is not particularly higher than the reference temperature Tro, that is, a sufficiently long time (for example, three hours or more) has elapsed since the engine was stopped, and the actual room temperature is detected by the room temperature sensor 181. If it is determined that the state is possible, step 109
To execute the air conditioner control based on the detected temperature Tr.

Further, when it is determined in step 110 that the temperature Tr is higher than the temperature Tro, that is, the elapsed time since the engine is turned off is short, and the room temperature sensor 181 cannot accurately detect the room temperature. If it is determined, the process proceeds to step 111, where the flag F is set to "1". Then, the process proceeds to a step 107, wherein a new reference temperature Tro is calculated and stored.

That is, in this air conditioner, when the engine is turned off, the room temperature Tr at that time is detected and stored as control reference temperature information Tro. Then, when the engine is started again, the elapsed time from the stop of the engine to the restart is determined from the temperature of the engine cooling water,
In a state where it can be determined that the room temperature sensor is detecting a temperature higher than the actual room temperature, that is, step 11
When “YES” is determined as 0, or when the flag F is determined as “1” at step 106, the storage temperature information Tro
Further, the control temperature information Tr is calculated based on the elapsed time measured by the timer. Then, the air conditioner control is executed according to the calculated temperature.

FIG. 4 is for explaining this control mode. First, when the engine is operating, as shown in FIG.
(Solid line) is stably adjusted near an arbitrary target temperature. When the engine is stopped in this state, the measured temperature Tr at the time of the stop is stored and held as it is as the storage temperature Tro. In this case, the cooling water temperature of the engine is stable until the engine stops, as shown in FIG.
° C), and the temperature of the cooling water gradually decreases as the engine stops.

Then, when the engine is restarted, the water temperature at that time is detected, and in a state where the water temperature is determined to be at least 50 ° C., the stored temperature Tro is read. At this time, the temperature detected by the room temperature sensor is in a state of detecting a temperature higher than the room temperature due to the surrounding residual heat. However, when the engine is restarted, the temperature (A) is determined from the relationship between the stored temperature Tro and the time measured by the timer. ) A temperature calculation value that monotonically increases from the start of the engine as shown by a thick solid line in the figure is obtained, whereby the air conditioner control is executed.

Further, when the engine is restarted after a lapse of a long time enough for the cooling water temperature to sufficiently decrease since the engine was stopped, as shown in FIG. Tr will correspond to the actual room temperature.

In this embodiment, when the engine is stopped, the temperature information Tro is stored corresponding to the detected temperature Tr of the room temperature sensor at that time, and this is used as the control reference temperature at the time of restart. . On the other hand, when the engine is stopped, the temperature of the air outlet of the air conditioner, that is, the calculated outlet temperature T _AO is obtained based on the operating state of the compressor, the amount of hot air, and the like. It is conceivable to make it memorize and hold as _AOO . When the engine is restarted, the sensor temperature T
r is compared with the memory temperature Tro, and the memory outlet temperature is
It is determined whether or not T _AOO is 30 ° C. or higher. If it is determined that T _AOO is 30 ° C. or more, it is determined that the heating operation was performed when the engine was stopped. By performing such a determination operation, when the heating operation is requested, the corrective operation in step 107 is performed.

Further, in the processing step 105 performed at the time of restart, at the same time as comparing the measured temperature Tr and the stored temperature Tro, the outside temperature Tam is measured, and whether or not this outside temperature Tam is in a state of 10 ° C. or less is determined. The determination may be made. And
Step 1 also provided that the outside temperature Tam is 10 ° C or less
Go to 06.

FIG. 5 shows another example of the processing in the computer 17. In the initial setting in step 201, the flag F is set to "0" and the first timer is set.
Start TIM1 and stop the second timer TIM2. In step 202, an input routine for obtaining the measured value Tr of the room temperature sensor is executed, and in step 203, it is determined whether or not the engine has been changed from on to off. When it is determined that the engine has been switched to the off state, the routine proceeds to step 204, where a storage routine is executed, and the measured temperature value Tr when the engine is off is stored and stored as storage reference temperature information Tro. Then, in step 205, the second timer TIM2 is set, and in step 206, it is monitored whether the engine has been switched from the off state to the on state. When the engine is turned off, the process returns to step 201.

When it is determined in step 203 that the engine is kept on, the process proceeds to step 207, where the measured temperature Tr of the room temperature sensor is compared with the stored temperature Tro, and when it is determined that the measured temperature Tr is high. Proceeds to step 208, and determines whether or not the flag F is “1”. If it is determined that the flag F is "0", the process proceeds to step 209, where the outside air temperature Tam
Is selected as a map in, for example, a memory or the like, and is selectively read out in accordance with the measured outside temperature Tam.

Then, in the next step 210, the estimated temperature Trd is calculated.
After the engine stops, the room temperature changes in a direction approaching the outside temperature. Therefore, the second timer TIM2 corresponding to the stored temperature Tro and the time To from the stop of the engine to the restart thereof To
Of the room temperature Tr when the engine is restarted from the measured value of the engine temperature and the constant K corresponding to the degree of change of the room sound according to the outside temperature Tam.
d is estimated.

In step 211, the estimated room temperature Tdr is compared with the outside temperature Tam, and the process proceeds to step 212 in a state where the outside temperature Tam is determined to be higher than the estimated temperature Trd, and the estimated temperature Trd is made to coincide with the outside temperature Tam. The flag F is set to "1". If it is determined in step 211 that the outside temperature Tam is lower,
Proceed directly to step 213.

When it is determined in step 208 that the flag F is "1", or after the flag F is set to "1" in step 213, the routine proceeds to step 214, where the temperature Trd is set to the initial value when the engine is started. A new estimated temperature Trd is calculated based on the elapsed time from the set time, that is, the measured value of the first timer TIM1, and this Trd is used as the measured temperature Tr in step 215. Then, the process proceeds to step 216 of the next air conditioner control.

FIG. 6 shows a control mode corresponding to such a control flow.

That is, in this embodiment, the elapsed time from the stop of the engine is measured by the second timer TIM2, and the indoor temperature T is calculated by a constant K corresponding to the outside temperature Tam.
rd is estimated, and based on the estimated value, the air conditioner control at the time of restarting the engine is executed.

[Effects of the Invention] As described above, according to the automotive air conditioner according to the present invention, the detected temperature of the indoor temperature sensor is higher than the actual room temperature due to various environmental conditions immediately after the engine is stopped, particularly during the heating operation. The problem of detecting the temperature is definitely improved. That is, even if the engine is restarted relatively shortly after the engine stop control and the air conditioner is restarted, the air conditioning control that estimates the appropriate room temperature from the beginning is executed.

[Brief description of the drawings]

1 is a schematic configuration diagram illustrating an air conditioner according to an embodiment of the present invention, FIG. 2 is a configuration explanatory diagram of an air conditioning control unit, FIG. 3 is a flowchart illustrating a flow of air conditioning control processing, FIG. 4 is a diagram showing a measured temperature state, a change state of room temperature, and the like corresponding to this processing, FIG. 5 is a flowchart for explaining another embodiment of the air conditioning control processing, and FIG. FIG. 11 ON / OFF detecting means 12 Indoor temperature detecting means
13 ... indoor temperature detection storage means, 14 ... elapsed time calculation means,
15 ... Control temperature calculation means, 16 ... Air conditioner control means, 17
…… Microcomputer, 181-183 …… Sensors, 19
… Temperature setting device.

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60H 1/00 101

Claims (1)

(57) [Claims] An air conditioner for an automobile, comprising: temperature detecting means for detecting a temperature in a vehicle interior; and control means for adjusting a vehicle interior temperature to a target temperature based on the temperature detected by the temperature detecting means. On / off detection means for detecting on / off control of the engine, and a temperature storage means for storing a temperature detected by the temperature detection means as temperature information in accordance with detection of the off control of the engine by the on / off detection means; Along with the on / off detection of the engine by the on / off detection means, an elapsed time calculation means for calculating an elapsed time since the engine was turned off, and in response to the elapsed time obtained by the elapsed time calculation means,
Control temperature calculation means for correcting a storage value of the temperature information stored in the temperature storage means and calculating a control temperature based on the corrected storage value, and outputting a control temperature based on the calculated control temperature. An automotive air conditioner characterized by controlling.