JPH063683Y2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vehicle air conditioning control device that uses an outside air temperature signal as one factor of air conditioning control.

(Prior Art) It is widely known that an air conditioner is controlled by a microcomputer by using the outside air temperature as one of the control factors, and such an example is disclosed in Japanese Patent Publication No. 59-39334. . This is formed by directly converting the output signal of the outside air temperature detector into a digital signal from the outside air temperature signal for control that is taken in by the microcomputer, and determines the heat load based on this outside air temperature signal and signals from other sensors. The calculation is performed and the air conditioner is controlled according to the result.

(Problems to be solved by the invention) However, in order to measure the outside air temperature as accurately as possible, the above-mentioned outside air temperature detector is generally arranged behind the front bumper of the vehicle body and in front of the radiator. At times, when waiting for traffic lights, when traffic is congested, etc., the waste heat of the engine wraps around the front of the vehicle body, and the ambient temperature detected by the outside air temperature detector becomes higher than the true outside air temperature.
As a result, the above-described conventional device in which the outside air temperature signal immediately responds to the ambient temperature has a drawback in that the air conditioning is unnecessarily corrected and the vehicle interior temperature decreases.

Also, depending on the environment, the ambient temperature of the outside air temperature detector may be lower than the true outside air temperature, but even in such a case, if the outside air temperature signal immediately responds to the ambient temperature, it will be unnecessarily air-conditioned. Is corrected.

On the other hand, in the initial stage of engine startup, if the ambient temperature signal taken into the microcomputer is set so that it does not respond immediately to the ambient temperature, if the ambient temperature is still high as when restarting, it will be supplied to the vehicle interior. There is also the inconvenience that extra wind rises in the wind.

Therefore, in this invention, in the initial stage of starting the engine, the outside temperature signal for control taken into the microcomputer is made to respond immediately to the ambient temperature, and after that, the outside temperature signal is not made to respond to the ambient temperature, and the temperature control is uncomfortable. It is an object of the present invention to provide a vehicle air-conditioning control device that eliminates the problem.

(Means for Solving the Problem) However, the gist of the effect of the present invention is that the outside air temperature detector 100 for detecting the temperature outside the vehicle and the timer means 200 for starting the clock by starting the engine. Then, until the predetermined time elapses by the timer means 200, the outside air temperature signal obtained by the outside air temperature detector 100 is directly used as the outside air temperature signal for control, and after the elapse of the predetermined time, the outside air temperature detector 100 The control signal forming means 300 for delaying and changing the outside air temperature signal for control according to the change in the obtained outside air temperature signal, and the outside air temperature signal for control are taken in as one factor of the air conditioning control, and the air conditioning mechanism 500 is operated. And a control means 400 for controlling.

(Operation) Therefore, within a predetermined time after the engine is operated,
Since the output signal of the outside air temperature detector is used as it is as the outside air temperature signal for control, the engine starts, the fan of the radiator rotates, and the ambient temperature of the outside air temperature detector suddenly changes while driving to reach the true outside air temperature. In the process of approaching, air conditioning control can be performed promptly. On the other hand, after the predetermined time has elapsed, when the ambient temperature rises or falls, the outside air signal for control changes with a delay, so that the air conditioning will not be unnecessarily corrected, and therefore, the above problems will be solved. Is something that can be achieved.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the vehicle air conditioner is provided with an intake door switching device 2 on the most upstream side of the air conditioning duct 1, and the intake door switching device 2 is provided with a portion where an inside air inlet 3 and an outside air inlet 4 are separated from each other. An air switching door 5 is arranged, and the inside / outside air switching door 5 is operated by an actuator 6 so that the air introduced into the air conditioning duct 1 can be selected from inside air and outside air.

The blower 7 sucks air into the air conditioning duct 1 and blows the air to the downstream side, and an evaporator 8 and a heater core 9 are provided on the downstream side of the blower 7.

The evaporator 8 includes a compressor 10 and a condenser 1.
1, liquid tank 12 and expansion valve 1
A cooling cycle that is pipe-connected with 3 is configured,
The compressor 10 is connected to an engine 14 of an automobile through an electromagnetic clutch 15, and the electromagnetic clutch 15
The drive stop control is performed by turning on and off. Further, the heater core 9 is designed so that the cooling water of the engine 14 circulates to overheat the air. An air mix door 16 is provided in front of the heater core 9, and the air passing through the heater core 9 and the heater core 9 are adjusted by adjusting the opening of the air mix door 16 with an actuator 17.
The amount of air that bypasses is changed so that the temperature of the blown air is controlled.

Further, on the downstream side of the air duct 1, a defrost outlet 18, a vent outlet 19 and a heat outlet 20 are divided into openings in a vehicle compartment 21, and the divided mode doors 22 are provided.
a, 22b, 22c are provided, and the mode door 22
By operating a, 22b, 22c with the actuator 24, a desired blowout mode can be obtained.

25 is an in-vehicle temperature detector that detects the temperature TR in the vehicle interior;
Is an opening detection means for detecting the opening x of the air mix door 16, such as a potentiometer, 27 is an outside air temperature detector for detecting the temperature TA outside the vehicle compartment, and 28 is a solar radiation detector for detecting the amount of solar radiation Ts. , 29 are temperature settings T in the passenger compartment
A temperature setter for performing a set, 30 is a water temperature detector that is attached to a fin of a heater core, a heater pipe for supplying a heat medium, or the like, and indirectly detects a temperature Tw of engine cooling water,
These output signals are sent to the A / D via the multiplexer 31.
It is input to the converter 32, converted into a digital signal here, and input to the microcomputer 33.

The microcomputer 33 has a central processing unit (CPU) (not shown), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), and the like, which are known per se. For example, an ignition switch is used. After being turned on, a control signal is output to each of the actuators 6, 17, 24, the electromagnetic clutch 15 and the motor of the blower 7 via the drive circuits 34 to 38 based on the various input signals described above, and each door 2, Drive control of 16, 22a, 22b, 22c, on / off control of the compressor 10, and rotation control of the motor are performed.

In FIG. 3, an example of a control routine of an outside air temperature signal input from the outside air temperature detector 27 among various input signals is shown as a flowchart, which will be described below according to this flowchart.

The microcomputer 33 starts the control from step 50, and determines whether or not the control of this routine is the first time since the ignition switch was turned on in the next step 52, based on whether or not the flag is "0". . The flag is initially set to "O". If the control of this routine is the first time, the routine proceeds to step 54,
A timer (Time) is started, the flag is set to "1" in the next step 56, and then the process proceeds to step 58. On the other hand, when it is determined in step 52 that the control of this routine is the second time or later, steps 54 and 56 are bypassed and the process proceeds to step 58.

In step 58, the outside air temperature signal TAR output from the outside air temperature detector 27 is captured in the form of a digital signal,
Proceed to next step 60.

At step 60, a predetermined time A after the timer is activated
Is determined, and if the predetermined time A has not elapsed, the routine proceeds to step 62, where the outside air temperature signal T A
Let R be the same as the outside temperature signal TAC for control. If the predetermined time A has elapsed, the routine proceeds to step 64, where the TAR and TAC are compared in magnitude. In addition, predetermined time A
Is the time from when the engine is operated until the ambient temperature of the outside air temperature detector 27 is settled down to the true outside air temperature, and is determined in advance by experiments or the like.

In step 64, when the outside air temperature signal TAR output from the outside air temperature detector 27 is larger than the outside air temperature signal TAC for control, the routine proceeds to step 66, where the previously used outside air temperature signal for control is predetermined. The change amount (ΔTA / ΔTime) is added to form a new outside air temperature signal TAC for control.

On the contrary, the outside temperature signal TAR is the outside temperature signal TAC for control.
If it is smaller than the above, the routine proceeds to step 68, where a predetermined change amount (ΔTA / Δ
Time) is subtracted to obtain a new outside air temperature signal TAC for control.

After steps 62, 66 and 68, step 7
The control routine is shifted to another control routine for performing air conditioning control via 0.

Then, within a predetermined time A after starting the engine,
The outside air temperature signal TAC for control will immediately follow the ambient temperature of the outside air temperature detector 27 and fluctuate.
As shown in the figure, when the engine is stopped and restarted (running) without taking too much time, the ambient temperature of the outside air temperature detector 27 increases due to the waste heat of the engine 14, After restarting (running), waste heat is removed and TAC is quickly returned to the true ambient temperature value. On the other hand, after a predetermined time A has elapsed since the engine was started, steps 66 and 68 do not immediately follow changes in the ambient temperature,
It is delayed.

(Effects of the Invention) As described above, according to the present invention, control is performed in response to the ambient temperature in the initial stage of starting the engine, so that, for example, when the engine is restarted, extra blowing is eliminated. After a predetermined time has passed since the engine was started, the outside temperature signal for control is changed with a delay relative to the change in ambient temperature.For example, when the engine is idle or in a traffic jam, Even when the ambient temperature temporarily fluctuates due to the waste heat of the engine, the air conditioning is not unnecessarily corrected, and the discomfort in temperature control can be eliminated.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flow chart showing an example of a control routine of an outside air temperature signal, and FIG. It is a diagram which shows the relationship between the generated outside temperature signal and time. 100 ... outside air temperature detector, 200 ... timer means, 3
00 ... Control signal forming means, 400 ... Control means, 50
0: Air conditioning system.

Claims (1)

[Scope of utility model registration request] 1. An outside air temperature detector 10 for detecting a temperature outside a vehicle.
0, the timer means 200 that starts the measurement after the engine is started, and the outside air temperature signal obtained by the outside air temperature detector 100 is used as it is until the predetermined time elapses by the timer means 200. As a signal, after a predetermined time has passed,
A control signal forming unit 300 that delays and changes the outside air temperature signal for control according to a change in the outside air temperature signal obtained by the outside air temperature detector 100, and a factor that controls the outside air temperature signal for control. And a control unit 400 for controlling the air conditioning mechanism 500.