JP2661129B2 - Outside air temperature detector for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle outside air temperature detecting device, and is effective for use in a vehicle air conditioning control device.

[Conventional technology]

2. Description of the Related Art Conventionally, there is an automatic air control device for a vehicle that automatically controls a switching mode of an inside / outside air switching damper, an opening degree of an air mix damper, and the like based on a detection result of an outside air temperature sensor. At this time, the outside air temperature sensor is disposed in the engine room of the vehicle at a position where heat radiation from the engine is least likely to be received, for example, at a front side of a radiator which is the foremost part in the engine room.

[Problems to be solved by the invention]

According to such a configuration, while the vehicle is running, the outside air temperature sensor can favorably receive the flow of the outside air, and can correctly detect the temperature of the outside air. However, when the vehicle is stopped, the flow of outside air is stopped, so that the outside air temperature sensor may be affected by disturbance due to heat radiation energy of the engine. In this case, the temperature detected by the outside air temperature sensor is the ambient temperature of the outside air temperature sensor, and the outside air temperature cannot be correctly detected.

The present invention has been made in view of the above-described problems, and is intended for a vehicle that can obtain a temperature substantially corresponding to an actual outside air temperature even when an outside air temperature sensor is affected by disturbance such as heat radiation energy of an engine. It is an object to provide an outside air temperature detecting device.

[Means for solving the problem]

Therefore, as shown in FIG. 1, a vehicle outside air temperature detection device according to the present invention is installed in a part of a vehicle, and detects an outside air temperature at regular time intervals (M ₁ ); Determining means (M ₂ ) for determining the degree of change in the detected outside air temperature detected by the processing means; and smoothing processing means for calculating and outputting a smoothed processing outside air temperature with respect to the detected outside air temperature detected by the outside air temperature sensor ( M ₃ ), and a smoothing strength control means (M ₄ ) for increasing the smoothing strength of the smoothing processing means, wherein the smoothing processing means comprises an outside air temperature detected this time by the outside air temperature sensor. And the averaging process outside air temperature calculated based on the previously detected outside air temperature is weighted, and the present averaging process outside air temperature is calculated based on these weights. The means is Against better processing means, wherein with the increase degree of change in the determined the detected outside air temperature is increased by discriminating means (M _2), it is controlled to be heavier previous smoothing weighting processing the outside air temperature, technical that Adopt means.

[Action]

The operation of the above configuration will be described with reference to FIG.

Detecting the outside air temperature detected by the installed outside air temperature sensor M ₁ in a part of the vehicle, determination means M ₂ and smoothing processing means
It is sent to the M _3. The smoothing means M ₃ performs a smoothing process to reduce the degree of change in the detected outside air temperature per unit time,
The annealing outside air temperature is calculated. On the other hand, if the determination means M ₂ is detected degree of change in outside air temperature to determine, and outputs the determination result to Shi intensity control means M ₄ raw. The smoothing intensity control means M ₄ is the determination means M ₂ discrimination result, with increasing degree of change in the outside air temperature increases, the a has strength control means,
To the smoothing processing means, and controlled to be heavier previous smoothing weighting processing the outside air temperature, it of moderation the degree of change per unit time of the detected outside air temperature to smaller processing means M ₃ Control strength. As a result, it is possible by the smoothing process unit M _3, relaxes in accordance with only the temperature rise change due to disturbance of the heat radiation energy of the engine with the magnitude of the disturbance.

〔The invention's effect〕

As described above, according to the present invention, even if the outside air temperature detected by the outside air temperature sensor rises due to the disturbance, the temperature change is moderated according to the magnitude of the disturbance, so that the temperature substantially corresponds to the actual outside air temperature. The temperature can be determined as the outside air temperature.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, examples in which the present invention is applied to a vehicle air conditioning control device will be described.

FIG. 2 is a schematic diagram showing a configuration of the air conditioning control device.
Reference numeral 1 denotes an air duct which introduces outside air from an outside air intake 1a and circulates vehicle interior air from an inside air intake 1b.
Reference numeral 2 denotes an inside / outside air switching damper, which can be opened and closed by an inside / outside air switching damper actuator 21. The outside air introduction state is shown by a solid line, and the inside air circulation state is shown by a broken line. 3
Is a blower motor that sucks air from the outside air intake 1a or the inside air intake 1b and blows air toward the passenger compartment 8.
Reference numeral 4 denotes an evaporator, which is disposed transversely in the air duct 1.

Reference numeral 9 denotes a compressor, which is connected by a belt to an engine serving as an on-vehicle drive source of an automobile, and is operated by its rotational driving force. The compressor 9 has a built-in electromagnetic clutch for connecting to the engine. The compressor is connected when the electromagnetic clutch is energized, and is disconnected when the power is cut off.

Reference numeral 6 denotes a heater core, which introduces engine cooling water and heats and sends the blown air by the heat. Reference numeral 7 denotes an air mix damper, which adjusts the temperature by mixing cooling air and heating air and blows out the air into the vehicle interior 8. Reference numeral 10 denotes a room temperature sensor that detects the temperature in the vehicle compartment 8 and generates a room temperature signal. Reference numeral 11 denotes an opening sensor that detects an opening position of the air mix damper 7 and generates an opening signal. The degree of opening is fed back for temperature control using a potentiometer linked to the movement. Reference numeral 12 denotes an outside air temperature sensor that detects an outside air temperature and generates an outside air temperature signal. Reference numeral 13 denotes a water temperature sensor for detecting a heater core inlet water temperature, 14 denotes an evaporator outlet temperature sensor for detecting the air temperature at the evaporator outlet, and 15 denotes a solar radiation sensor for obtaining an output corresponding to the amount of solar radiation entering the vehicle interior. Reference numeral 20 denotes an operation panel for manually setting various operation modes and a set temperature in the vehicle compartment, and displaying the set temperature or the outside air temperature. Reference numeral 16 denotes an A / D converter for converting an analog signal to a digital signal. The A / D converter 16 converts a room temperature signal (T _r ) from the room temperature sensor 9, an opening signal (A _r ) from the opening sensor 10, and an external signal from the outside air temperature sensor 12. An air temperature signal (T _am ), a water temperature signal (T _w ) from the water temperature sensor 13, an evaporator outlet temperature signal (T _E ) from the evaporator outlet temperature sensor 14, and a solar radiation signal (T _s ) from the solar radiation sensor 15 are sequentially digitized. This is converted into a signal.

Reference numeral 17 denotes a microcomputer for executing a predetermined air conditioning control program, and a crystal oscillator 1 of several megahertz (MHz).
8 is connected, and a stable voltage is supplied from a stabilized power supply circuit (not shown) that generates a stabilized voltage based on a power supply from a vehicle-mounted battery. A command signal for adjusting the rotation speed of the blower motor 3 by the arithmetic processing of the microcomputer 17, a command signal for operating the hot water valve driving actuator 24, a command signal for turning the compressor 9 on and off efficiently, A command signal for adjusting the opening degree of the air mix damper 7, a command signal for driving the inside / outside air switching damper actuator 21, and a display signal for the display 20e are generated.

Reference numeral 19 denotes an opening adjustment actuator for adjusting the opening of the air mix damper 7, which receives an opening command signal from the microcomputer 17 and performs an operation corresponding to the opening command signal. Reference numeral 5 denotes a drive circuit for controlling the number of rotations of the blower 3, which controls the number of rotations of the blower in accordance with a signal from the microcomputer 17.

Reference numeral 22 denotes a hot water valve which is opened and closed by a hot water valve driving actuator 24 which is operated by a command signal from the microcomputer 17.

The outside air temperature sensor 12 is provided at a position that is less likely to receive heat from the engine, such as further in front of a radiator provided at an air intake at the front of the vehicle or inside a rear bumper at the rear of the vehicle.

FIG. 3A shows a detailed view of the operation panel 20. In FIG. 3 (a), 20a is a switch for selecting automatic operation or manual operation, 20b is an off switch, 20c is a switch for instructing the operation of the refrigeration cycle, 20d is a switch for selecting between internal air circulation and external air introduction, 20e is an indicator that displays the set temperature or outside temperature, 20f and 20g are up and down switches for adjusting the set temperature, 20h is a switch that commands the outside temperature display, and 20i, 20j, and 20k are blower fan feeds. Switches for commanding the air flow, 20l, 20m, 20n, and 20o, are switches for selecting the outlet.

The operation of the above configuration will be described with reference to the flowchart of the main routine in FIG.

In step 10, each sensor 10, which has passed through the A / D converter 16,
Set temperature (T _set ) adjusted by outputs from 11, 12, 13, 14, and 15, up switch 20f and down switch 20g
Is input to the microcomputer 17.

In step 20, the set temperature (T _set ), room temperature signal (T _r ), solar radiation signal (T _s ), and the fifth
The required outlet temperature (TAO) is calculated from the _averaging process outside air temperature (T _amn ) calculated by the outside air temperature detection routine shown in the figure.
Is performed.

In step 30, from the required outlet temperature (TAO) calculated in step 20, the inside / outside air switching damper 2, the blower motor
3. The air conditioning control means such as the air mix damper 7 is driven to control the air conditioning in the vehicle compartment. The processing of this main routine is repeated at a predetermined cycle.

Next, the outside air temperature detection routine will be described with reference to the flowchart of FIG.

The outside air temperature detection routine is executed at regular intervals (for example, one minute), and calculates a temperature considered to be the actual outside air temperature from the outside air temperature detected by the outside air temperature sensor 12 by smoothing processing. Note that the smoothing process described here means that the detected outside air temperature (T _am ) detected by the outside air temperature sensor 12 is directly used in obtaining the current outside air temperature, for example, as in the arithmetic expression of step 190. Rather, it is an averaging process by appropriate weighting performed with the previous _annealing process outside air temperature (T _amn-1 ). Accordingly, the degree of change in the detected outside air temperature (T _am ) per unit time of the _anneal processing outside air temperature (T _amn ) is reduced.

In step 110, it is determined whether or not this processing is the first processing. If it is determined in step 110 that the process is the first process, the process proceeds to step 120, in which the detected outside air temperature (T _am ) of the outside air temperature sensor 12 is set to the previous _smoothed processing outside air temperature (T _amn-1 ). . In step 130, the subtraction of the detected outside air temperature of the outside air temperature sensor 12 (T _am) from the previous annealing process outside air temperature (T _amn-1) is performed. Thereby, the degree of change ΔT _am of the outside air temperature is calculated.

In step 140, it is determined whether or not the degree of change in the outside air temperature (ΔT _am ) calculated in step 130 is larger than a predetermined value C (> 0).

If it is determined in step 130 that the degree of change in the outside air temperature (ΔT _am ) is larger than the predetermined value C, step 1
Proceed to 60; if smaller, proceed to Step 150.

In step 150, it is determined whether the degree of change in the outside air temperature (ΔT _am ) is positive or negative. In other words, if the detected outside air temperature (T _am ) is higher than the previous _anneal processing outside air temperature (T _amn-1 ), the process proceeds to step 170,
If smaller, go to step 180.

In step 160, the control value m is set to 16, in step 170, the control value m is set to 4, and in step 180, the control value m is set to 2, respectively.

In step 190, the detected outside air temperature (T _am ) detected by the outside air temperature sensor 12 in accordance with the control value m set in steps 160, 170, and 180 and the previous anneal processing outside air temperature (T
_amn-1 ) and the current _annealing outside air temperature ( _Tamn ) is calculated. Here, in the arithmetic expression of step 190, step 16
As the degree of change of the detected outside air temperature (T _am ) in the positive direction increases by 0, _{170, and 180} , the weight of the previous _anneal processing outside air temperature (T _amn-1 ) is increased. This is because it is generally assumed that the outside air temperature does not change suddenly during an instant, and if there is such an abnormal change, the outside air temperature sensor 12 is affected by some disturbance. Therefore, the present outside air temperature is mainly obtained by referring to the previous _annealing outside air temperature (T _amn-1 ). On the other hand, when the detected outside air temperature (T _am ) changes in the negative direction, it is highly possible that the temperature that has risen due to some disturbance is approaching the true outside air temperature or that the actual outside air temperature has naturally dropped. High. Therefore, when _{obtaining the current} outside air temperature, the weights of the detected outside air temperature (T _am ) and the previous _anneal processing outside air temperature (T _amn-1 ) are made equal,
_Immediately make the _annealing outside air temperature (T _amn ) close to the detected outside air temperature (T _am ). Steps 160, 170, 1
The control value m of 80 is not limited to the current value.

In step 200, the current _anneal processing outside air temperature (T _amn ) is set as the previous _anneal processing outside air temperature (T _amn-1 ), and the process is terminated. Here, the determining means of the present invention
Equivalent to 130,140,150
60, 170, and 180, and the annealing process corresponds to step 190.

Next, an outside air temperature display routine shown in FIG. 6 will be described.

The outside air temperature display routine is performed by the operation panel shown in FIG.
It starts by interrupt processing when the outside temperature display switch 20h of 20 is input.

In step 210, as shown in FIG. 3 (c), the outside air temperature display segment indicating the outside air temperature display is turned on.

In step 220, the outside air temperature (T _amn ) obtained by the outside air temperature detection routine shown in FIG. 5 is displayed, and the process is terminated.

Next, the set temperature display routine shown in FIG. 7 will be described.

The set temperature display routine is started by interrupt processing when the up switch 20f or the down switch 20g of the operation panel 20 shown in FIG. 3A is input.

In step 310, as shown in FIG. 3 (b), the set temperature display segment indicating the set temperature display is turned on.

In step 320, the set temperature adjusted by the up switch 20f or the down switch 20g is displayed, and the process ends.

In this embodiment, the outside air temperature display switch 20h
Is input, the outside air temperature display is continued until the up switch 20f or the down switch 20g is input next. However, after displaying the outside air temperature for a certain period of time, the display may automatically return to the set temperature display. Further, the set temperature display section and the outside temperature display section may be separately provided, and both of them may be always displayed.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a schematic diagram showing a configuration of an embodiment to which the present invention is applied, and FIGS.
(B) and (c) are plan views of the operation panel, FIG. 4 is a flowchart of a main routine of the present embodiment, FIG. 5 is a flowchart of an outside air temperature detection routine, FIG. FIG. 7 is a flowchart of a set temperature display routine. M ₁ …… Ambient temperature sensor, M ₂ …… Discriminating means, M ₃ …… Smoothing processing means, M ₄ …… Smoothing strength control means,

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Fumio Otsuka 1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd.

Claims (1)

(57) [Claims] 1. An outside air temperature sensor (M ₁ ) installed in a part of a vehicle and detecting an outside air temperature at predetermined time intervals, and a judging means for judging a degree of change of a detected outside air temperature detected by the outside air temperature sensor. (M ₂ ), averaging processing means (M ₃ ) for calculating and outputting an averaging processing outside air temperature with respect to the detected outside air temperature detected by the outside air temperature sensor, and averaging strength of the averaging processing means Smoothing strength control means (M ₄ ), wherein the smoothing processing means calculates the outside air temperature based on the outside air temperature detected by the outside air temperature sensor this time and the outside air temperature detected last time. The simulated processing outside air temperature is weighted, and the averaging processing outside air temperature is calculated based on these weights. The averaging processing means controls the averaging processing means with respect to the averaging processing means. determined by (M ₂₎ A vehicle outside air temperature detecting device, wherein the weighting of the previous averaging process outside air temperature is controlled to increase as the detected outside air temperature rise change degree increases.