JP2713593B2 - Automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a vehicle for which air-conditioning control can always be performed based on an accurate outside temperature regardless of whether the vehicle is running or stopped. It relates to an air conditioner.

(Prior Art) Among the commonly used automotive air conditioners,
In an auto air conditioner that automatically performs all controls based on signals from sensors, etc., the temperature in the cabin is always maintained at the set temperature regardless of changes in the outside temperature, etc., so it responds quickly to changes in the external environment. Correction sensors for the correction are attached to each part of the vehicle.

Of these correction sensors, an outside air sensor for correcting a change in the outside air temperature can protect the outside air sensor from a mechanical or bad environment, such as the inside of a bumper at the front of the vehicle, and can provide an outside air sensor as appropriate as possible. It is provided in a place where temperature can be detected.

However, even when the outside air sensor is installed in an optimal location, when the vehicle stops, it is temporarily affected by the exhaust gas of the own vehicle or other vehicles and the hot air sent out from the radiator cooling fan, and the accuracy is temporarily reduced. There is a problem that an unusual outside temperature cannot be detected. In order to solve such a problem, for example, as disclosed in Japanese Patent Publication No. Sho 62-5804, when the speed of the vehicle falls below a predetermined speed, the outside air temperature at the time when the speed falls below the predetermined speed is temporarily reduced. For a predetermined period of time, the influence of the above-mentioned hot air or the like is not exerted on the control of the air conditioning. Then, when the vehicle speed becomes equal to or higher than the predetermined speed, the elapsed time from that time is returned to the actual outside temperature.

(Problems to be Solved by the Invention) However, in such a conventional air conditioner for a vehicle, when the speed of the vehicle becomes equal to or less than a predetermined speed, the outside air temperature when the speed becomes equal to or less than the predetermined speed is temporarily reduced. However, if the switching control of the outside air temperature is performed only by the time after the speed becomes equal to or higher than the predetermined speed, the time when the speed becomes equal to or higher than the predetermined speed is short especially in traffic jam operation in a city. Therefore, the time for temporarily holding the data becomes long. For this reason, the stored outside air temperature may become different from the actual outside air temperature, and if the air-conditioning control of the vehicle air conditioner is performed over a long period of time using the stored air temperature, the vehicle interior May deviate from the set temperature. Therefore, it is desirable that the time for performing control based on the held outside air temperature be as short as possible, provided that the outside air sensor can accurately detect the outside air temperature. However, since it takes some time until the temperature becomes the same as the outside air temperature due to the sensor itself and the specific heat of the surrounding structure, it cannot be simply shortened.

The present invention has been made in view of such a conventional problem, and the time in which control is performed by the held outside air temperature is made as short as possible, and the air conditioning control is always performed based on the accurate outside air temperature. It is an object of the present invention to provide an air conditioner for a vehicle that performs the following.

[Means for Solving the Problems] The present invention for achieving the above object includes an outside air temperature detecting means for detecting a temperature outside the vehicle compartment, a vehicle speed detecting means for detecting a vehicle speed of the vehicle, Temperature change rate calculating means for calculating a rate of change of the temperature detected by the outside air temperature detecting means at each time, and outputting a signal when the rate of change is equal to or more than a predetermined value; and a vehicle speed detected by the vehicle speed detecting means. Means for outputting a signal when is greater than or equal to a predetermined value, and measuring the integrated sum of the time during which the signal is output by the temperature change rate calculating means and the time during which the signal is output from the comparing means. Measuring means, and detecting the outside air temperature so that the change rate calculated by the temperature change rate calculation means becomes a predetermined value or more when the detection value of the outside air temperature detection means rises and becomes a predetermined value or more. While the temperature detected by the stage is output to the outside after the arithmetic processing, when the detection value of the outside air temperature detecting means falls and the change rate calculated by the temperature change rate calculating means becomes a predetermined value or more, the measurement is performed. Control means for activating the means and directly outputting the outside air temperature detected by the outside air temperature detection means to the outside after the measurement means has accumulated a predetermined time.

(Operation) The automotive air conditioner of the present invention configured as described above operates as follows.

First, when the temperature change rate calculating means detects that the outside air temperature has temporarily changed greatly, the control means detects the outside air temperature detected by the outside air temperature detecting means so that the change rate becomes a preset change rate. After the calculation processing, the temperature is output to the outside. That is, when the outside air temperature rises sharply, the outside air temperature that is followed with a pseudo-gradual temperature change is output to the outside.

Next, the time during which the decrease rate of the outside air temperature detected by the outside air temperature detecting means and calculated by the temperature change rate calculating means is equal to or more than a predetermined value, and the time elapsed since the vehicle speed becomes equal to or more than the predetermined speed. It is integrated by the measuring means. When the time integrated by the measuring means is equal to or longer than a predetermined time, the control means directly outputs the outside air temperature detected by the outside air temperature detecting means from the control for outputting the pseudo outside air temperature to the outside. Is switched to the control to output to.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of an outside air temperature output system of an automotive air conditioner according to the present invention.

As shown in the figure, a temperature change rate calculation for inputting a detected temperature of the outside air sensor 1 at predetermined time intervals to an outside air sensor 1 as an outside air temperature detecting means for detecting an outside air temperature and calculating a change rate of the detected temperature. A temperature change rate calculation unit 2 as means is connected, and a signal from the temperature change rate calculation unit 2 is output to a timer 3 as measurement means and a response speed adjustment unit 4 as control means. The timer 3 includes a temperature change rate calculation unit 2
To measure the time when the temperature change rate is equal to or more than the predetermined value.
Forms a detection signal of an outside air temperature used for control of the air conditioner. Further, a vehicle speed sensor 5 as a vehicle speed detecting means for detecting the vehicle speed of the vehicle is connected to a comparing unit 6 as a comparing means for comparing whether the detected vehicle speed is equal to or higher than a predetermined value. Is output to the timer 7 as a measuring means. When the signal is output from the comparison unit 6, the detected vehicle speed is equal to or higher than a predetermined value, and the timer 7 measures the time when the signal is output from the comparison unit 6. It is. The timer 3 and the timer 7 are connected to a time calculating unit 8 as a measuring unit, and the time calculating unit 8 calculates the sum of the integrated times of the timer 3 and the timer 7.
When the accumulated time calculated by the time calculation unit 8 becomes equal to or longer than a predetermined time, the time calculation unit 8 outputs a signal to the response speed adjustment unit 4, and the response speed adjustment unit 4 directly outputs the detection value of the outside air sensor 1. , As a detection signal.

The thus configured automotive air conditioner of the present invention operates as shown in the operation flowcharts of FIG. 2 and FIG. Prior to the description of the operation flowchart, the general operation of the automotive air conditioner of the present invention will be described.

For example, assuming that the vehicle stops and the temperature detected by the outside air sensor 1 suddenly rises due to the influence of the own vehicle and the other vehicle, the temperature change rate calculating unit 2 detects the sudden change in detected temperature, and the temperature change rate calculating unit 2 The response speed adjusting unit 4 does not directly output the detection signal from the outside air sensor 1 to the outside by inputting the signal, but outputs the signal once calculated as the detection signal to the outside. The calculated signal is the first signal
As shown in the figure, when the temporal change of the actually detected outside air temperature is represented by a characteristic line A, the change is pseudo-output as a gradual change as indicated by a characteristic line B. Signal. In other words, after processing a signal that is made to follow the actually detected outside air temperature so as to have a certain limited rate of change, it is regarded as the detected outside air temperature and output to the outside. Then, the vehicle travels, the outside air sensor 1 is no longer affected by the other vehicle and the detected outside air temperature starts to decrease, and a signal indicating that the change rate detected by the temperature change rate calculation unit 2 becomes equal to or more than a predetermined value is output. On the other hand, when the comparing unit 6 determines that the vehicle speed detected by the vehicle speed sensor 5 exceeds a predetermined value, the output time of the signal output from the comparing unit 6 is measured by a timer 7. The time calculation unit 8 calculates the sum of the integrated times by the timers 3 and 7, and when the integrated sum is equal to or longer than a predetermined time,
The time calculation unit 8 outputs a signal to the response speed adjustment unit 4, and the response speed adjustment unit 4 receives the signal and outputs the signal to the outside air sensor 1.
Is output directly to the outside.

As described above, the time during which the pseudo signal is output is such that the time during which the vehicle is running at or above the predetermined speed and the change in the rate of decrease in the outside air temperature detected by the outside air sensor are at or above the predetermined value. This is the time until the sum of the time and the predetermined time or more. As a result, in the case where the detection value of the outside air sensor 1 changes suddenly, the time during which the air conditioning control is performed with the simulated output outside air temperature can be shortened as compared with the related art.
Further, the accuracy of the air conditioning control can be improved.

In the present embodiment, the pseudo signal is output based on the rate of change of the temperature detected by the outside air sensor, but the pseudo signal is output by detecting that the vehicle speed has fallen below a certain value. Can also.

The general operation of the automotive air conditioner according to the present invention is as described above, and a more detailed operation will be described below.

 FIG. 2 shows a main routine in this embodiment.

First, when the program starts, the response speed adjustment unit 4 sets the flag F to 0, and the temperature change rate calculation unit 2 inputs the outside air temperature TA detected by the outside air sensor 1 (S
1, S2). Then, the temperature change rate calculation unit 2 stores the detected outside air temperature, and calculates the change rate α from the previously stored outside air temperature and the currently stored outside air temperature (S3, S4). Then, the response speed adjusting unit 4 outputs the outside air temperature T0 as a detection signal of the outside air sensor 1. The above processing from S2 to S5 is repeatedly performed until the air conditioner is stopped (S5, S6).

FIG. 3 is a subroutine flowchart processed in step S4 of FIG.

It is determined whether or not the flag F that stands when there is a sudden change in the detected value of the outside air temperature is 1 (SS10). If the flag F is not 1 and the change rate α is equal to or more than the predetermined value A, , The flag F is set to 1 (S11, S12), the outside air temperature T0 to be output to the outside is calculated, and the process proceeds to step 5 shown in FIG. 2 to output this outside air temperature T0 to the outside (S13). . On the other hand, if the change rate α is less than the predetermined value A, the outside air temperature T0 to be output to the outside is set as the actually detected outside air temperature TA, and the aforementioned step 5
And outputs the outside temperature T0 to the outside (S14). Further, the flag F is 1, and the rate of change α in which the outside air temperature falls is α.
Is less than the predetermined value B, the timer 3 measures the time t1 during which this temperature change falls within the predetermined range, and calculates the outside air temperature T0 to be output to the outside. On the other hand, if the change rate α is equal to or more than the predetermined value B, the outside air temperature T0 to be output to the outside is calculated (S15 to S17). Then, the comparison unit 6 inputs the vehicle speed V detected by the vehicle speed sensor 5 (S18). If the vehicle speed V is equal to or higher than the predetermined vehicle speed V0, the timer 7 keeps the vehicle speed equal to or higher than the predetermined vehicle speed t2. (S19,
S20). The sum t1 of the times measured by the timers 3 and 7
When + t2 becomes larger than the preset time t0, the flag F is set to 0, and the process proceeds to step 5 to output the outside temperature T0 to the outside (S21, S22). After the value rises sharply, the sum of the time during which the vehicle travels while maintaining the traveling speed equal to or higher than the predetermined value and the time when the rate of change in the outside air temperature detected by the external air sensor is equal to or higher than the predetermined value is calculated. Until the sum reaches a predetermined time, air-conditioning control is performed based on the simulated outside air temperature calculated by the response speed adjusting unit 4. When the sum reaches the predetermined time, the air-conditioning control is actually detected by the outside air sensor 1. The air conditioning control is performed based on the outside air temperature.

Therefore, it is possible to quickly determine that the outside air control 1 is in an environment where an appropriate outside air temperature can be detected, and the time of the air conditioning control performed based on the pseudo outside air temperature is minimized. Can be.

In the above-described embodiment, when the outside air temperature detected by the outside air sensor rises sharply, the air conditioning is performed by the pseudo outside air temperature. However, the steps 11 and 15 in FIG. If the determination of the rate of change to be performed is made based on an absolute value (the absolute value of the rate of change is compared with a predetermined value), on the contrary, the detection value of the outside air sensor is suddenly increased due to, for example, splashing. It is possible to perform air-conditioning with a pseudo outside air temperature even when the air temperature is lowered.

[Effects of the Invention] As is clear from the above description, according to the present invention,
The time during which the pseudo signal is output from the control means is determined by the sum of the time during which the vehicle is traveling while maintaining the predetermined speed or higher and the time during which the rate of change in the outside air temperature is equal to or higher than the predetermined value. Since the time until the time becomes equal to or longer than the time, in the case where the detection value by the outside air temperature detecting means sharply increases, the time for air conditioning control with the simulated output outside air temperature can be shortened as compared with the related art, and The accuracy of the air conditioning control can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an outside air temperature output system of a vehicle air conditioner according to the present invention, and FIGS. 2 and 3 are operation flowcharts of the vehicle air conditioner shown in FIG. DESCRIPTION OF SYMBOLS 1 ... Outside air sensor (outside air temperature detection means), 2 ... Temperature change rate calculation part (temperature change rate calculation means), 3, 7 ... Timer (measurement means), 4 ... Response speed adjustment part (control means), 5 ... Vehicle speed Sensors (vehicle speed detecting means), 6 ... comparing section (comparing means), 8 ... time calculating section (measuring means).

Claims (1)

(57) [Claims] 1. An outside air temperature detecting means (1) for detecting a temperature outside a vehicle compartment, a vehicle speed detecting means (5) for detecting a vehicle speed of a vehicle, and the outside air temperature detecting means (1) being detected at predetermined time intervals. A temperature change rate calculating means (2) for calculating a change rate of the temperature and outputting a signal when the change rate is equal to or more than a predetermined value; and a vehicle speed detected by the vehicle speed detecting means (5) being equal to or more than a predetermined value. Comparison means (6) for outputting a signal, and integration of the time during which the signal is output by the temperature change rate calculation means (2) and the time during which the signal is output from the comparison means (6). Measurement means (3,
7,8), and when the detected value of the outside air temperature detecting means (1) rises and the change rate calculated by the temperature change rate calculating means (2) becomes a predetermined value or more, a preset change rate is set. The temperature detected by the outside air temperature detecting means (1) is output to the outside after the arithmetic processing so that the detected value of the outside air temperature detecting means (1) decreases, and the temperature change rate calculating means (2) When the rate of change calculated by the above-mentioned method becomes equal to or more than a predetermined value, the measuring means (3, 7, 8) is operated, and after the measuring means (3, 7, 8) integrates a predetermined time, the outside air temperature is increased. A control unit (4) for directly outputting the outside air temperature detected by the detection unit (1) to the outside.