JPH0645292B2 - Vehicle air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle air conditioner.

[Prior art]

Conventionally, in this type of vehicle air conditioner,
An air blower is installed inside the air duct, and when the inside / outside air switching damper is in the outside air introduction state, the blower blows outside air through the air duct into the vehicle interior, and when the inside / outside air switching damper is in the inside air introduction state, The inside air is recirculated into the air duct through the recirculation duct and blown into the passenger compartment.

[Problems to be solved by the invention]

However, in such a configuration, since the blower is arranged close to the outlet of the air duct into the passenger compartment, the noise generated when the blower drives the vehicle propagates through the air duct into the passenger compartment, causing annoyance to passengers. There is a problem called. Further, since the blower blows the outside air or the inside air as an air flow into the passenger compartment by its blowing function, the inside air in the passenger compartment tends to stagnate.

Therefore, the present invention, in order to deal with the above-mentioned problems,
In a vehicle air conditioner, it is an object of the present invention to reduce as much as possible the noise propagating into the passenger compartment and the stagnation of the inside air in the passenger compartment from the air blowing means arranged in the air duct.

[Means for solving problems]

In solving such problems, the structural features of the present invention are as follows.
When the inside / outside air switching means is in the outside air introduction state, the outside air is blown through the air duct into the vehicle interior and the inside / outside air switching means is in the inside air introduction state to return the inside air in the vehicle interior to the return duct. In an air conditioner equipped with a blowing unit that recirculates through the air duct to blow air into the vehicle compartment, an exhaust unit that is disposed on the rear wall of the vehicle compartment to exhaust the inside air of the vehicle compartment, When the inside / outside air switching means is in an outside air introduction state, an outside air introduction detecting means for detecting this to generate an outside air introduction detection signal;
Output signal generating means for generating an output signal when the value of the speed detection signal is higher than a predetermined speed value, and allowing the air blowing operation of the air blowing means under at least disappearance of the outside air introduction detection signal and the output signal. A switching control for stopping the exhaust operation of the discharge means, and for stopping the blow operation of the blower means under the generation of both the outside air introduction detection signal and the output signal and for controlling the change so as to allow the exhaust operation of the exhaust means. The means is to provide.

[Action effect]

By configuring the present invention as described above, when the traveling speed of the vehicle is higher than the predetermined speed value and the inside / outside air switching unit is in the outside air introduction state, the outside air introduction detection unit outputs the outside air introduction detection signal. And the output signal generating means generates an output signal in cooperation with the speed detecting means, and the switching control means stops the air blowing operation of the air blowing means and allows the exhaust operation of the exhaust means. The exhaust means discharges the inside air of the vehicle compartment to the outside, and the outside air flows into the vehicle compartment through the air duct due to the decrease in the air pressure inside the vehicle compartment caused by the discharge, and then by the exhaust means as described above. As a result, the air in the vehicle compartment can be always kept fresh without being stagnated. In such a case, since the air blowing means is in a stopped state, the occupant will not be bothered by the noise generated from the air blowing means during the air blowing operation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
Drawing and Drawing 2 show the whole air-conditioner composition concerning the present invention applied to vehicles. The air conditioner includes an air duct 2 extending from a passenger compartment 10 of the vehicle.
0, and this air duct 20 has its outlet 21
The vehicle interior 10 is open through the front wall. Also,
The air duct 20 is open to the outside air at its outside air inlet 22, and the inside air inlet 23 of this air duct 20 passes through the return duct 30 and communicates with the inside of the vehicle compartment 10 through its front wall.

The switching damper 40 is selectively switched between the first and second switching states by a manual operation.
In the first switching state, the air duct 20 is opened to the outside air by the outside air introducing port 22, and in the second switching state, the air duct 20 is opened by the inside air introducing port 23 in the recirculation duct 30.
To communicate with the vehicle interior 10. The blower 50 is disposed in the air duct 20, and is driven by the DC motor 51 of the blower 50.
The inside air from 0 is introduced into the air duct 20 as an air flow and is blown into the vehicle interior 10 from the air outlet 21. In addition, the passenger compartment 10
A discharger 60 is arranged in the exhaust duct 11 extending outward from the rear wall of the vehicle, and the discharger 60 is driven by a DC electric motor 61 of the discharger 60. Is introduced into the exhaust duct 11 through the introduction port 11a and discharged to the outside. In FIG. 1, reference numerals 70, 80 and 90 respectively indicate an evaporator, an air mix damper and a heater.

Next, an electric control circuit for driving the DC motor 51 of the blower 50 and the DC motor 61 of the discharger 60 will be described. This electric control circuit includes a heater relay 100 connected to a DC power source B via an ignition switch IG of the vehicle, a blower switch 110 connected to the heater relay 100, the blower switch 110, both DC motors 51 and 61, and a heater. The heater relay 100 has a switching relay 120 connected to the relay 100, and the heater relay 100 energizes (or demagnetizes) the electromagnetic coil 101 to make the double throw contact 102 into the fixed contact 103 (or the ground fixed contact 104). ing. The heater relay 100
Fixed contact 103 is connected to the positive side terminal of DC power supply B via ignition switch IG, and double throw contact 10
2 is connected to each first input terminal of both DC motors 51 and 61.

The blower switch 110 includes a sliding contact 111 that interlocks with an operating lever (not shown) and fixed contacts 112, 113, 114, 115, which are slidably contacted by the sliding contact 111.
The fixed contact 112 is grounded. The fixed contact 113 is connected to the ignition switch IG via the electromagnetic coil 101 of the heater relay 100, and the fixed contact 114 is installed through both series resistors 117 and 118, while the fixed contact 115 is grounded via the series resistor 118. ing. Blower switch 110
Are fixed contacts 112, 113, 11 of the sliding contact 111.
6, the fixed contact 113 is grounded via the fixed contact 112 and is cut off from both fixed contacts 114 and 115, so that the fixed contacts 112, 113 and 1 of the sliding contact 111 are connected to each other.
Under the sliding contact with 15, the fixed contacts 113 and 115 are grounded via the fixed contact 112, the fixed contact 113 is cut off from the fixed contacts 114 and 116, and the sliding contact 11
The fixed contact 114 is grounded through the fixed contacts 112, 113 under the sliding contact with the fixed contacts 112, 113, 114.
Shut off from 16. As shown in FIG. 1, the resistors 117 and 118 are arranged in the air duct 20 downstream of the blower 50 and are subjected to forced air cooling by the blower 50.

The switching relay 120 is composed of an electromagnetic coil 121, both fixed contacts 122 and 123, and a double throw contact 124 that is turned on to the fixed contact 123 (or 122) by the excitation (or demagnetization) of the electromagnetic coil 121. Each fixed contact 1
22 and 123 are respectively connected to the second input terminals of the DC motors 51 and 61, while the double throw contact 124 is grounded through both series resistors 117 and 118.

Further, the electric control circuit includes a normally open type interlock switch 130,
Vehicle speed sensor 140 and F connected to this vehicle speed sensor 140
-V converter 150, reference voltage generator 160, F-V
It has a comparator 170 connected to the converter 150 and the reference voltage generator 160, and the interlocking switch 130 maintains the open state in the second switching state of the switching damper 40, and changes to the first switching state of the switching damper 40. It is designed to be closed by switching. The vehicle speed sensor 140 detects the traveling speed of the vehicle (hereinafter, referred to as vehicle speed) and generates a series of vehicle speed pulses at a frequency proportional to the detection result.

The FV converter 150 generates an analog voltage that is proportional to the frequency of each vehicle speed pulse from the vehicle speed sensor 140. The reference voltage generator 160 has a predetermined vehicle speed (for example, 40
Generate a reference voltage corresponding to km / h). The comparator 170 generates a high level signal (or low level signal) when the analog voltage from the FV converter 150 is higher (or lower) than the reference voltage from the reference voltage generator 160. The transistor 180 has a resistor 180 at its base.
A high-level signal (or a low-level signal) is received from the comparator 170 via a and it becomes conductive (or non-conductive).

The relay 190 includes an electromagnetic coil 191 and a normally open switch 192 that is closed (or opened) by exciting (or demagnetizing) the electromagnetic coil 191.
Is connected at one end to the collector of the transistor 180, and at the other end to the DC power supply to receive the DC voltage + Vc from the DC power supply. The normally open type switch 192 is grounded by its movable contact, and the fixed contact of this switch 92 is connected to the heater relay 10 via the interlocking switch 130 and the electromagnetic coil 121 of the changeover relay 120.
It is connected to zero double throw contact 102.

In the present embodiment configured as described above, assuming that the vehicle is traveling at a higher speed than the predetermined vehicle speed with the ignition switch IG closed, the FV converter 1
Since the analog voltage generated by the cooperation with the vehicle speed sensor 140 from 50 is higher than the reference voltage from the reference voltage generator 160, the comparator 170 generates a high level signal,
The transistor 180 is turned on, and the relay 190 closes the switch 192 by exciting the electromagnetic coil 191.

At this time, if the switching damper 40 is in the first switching state and the sliding contact 111 of the blower switch 110 is in sliding contact with each of the fixed contacts 112, 113, 114, the interlocking switch 130 is the switching damper 40. The electromagnetic coil 12 of the switching relay 120 is closed based on the first switching state of
When both switches 192 and 130 are closed, 1 is energized by receiving power from the DC power supply B while energizing the electromagnetic coil 101 of the heater relay 100 into the fixed contact 103 of the double throw contact 102. Double throw contact 124 is fixed contact 12
Throw in 3. Then, the power supply current from the DC power source B flows into the DC motor 61 through the ignition switch IG, the fixed contact 103 and the double throw contact 102 of the heater relay 100, and the fixed contact 123 and the double throw contact 124 of the switching relay 120 and the blower switch. 110 fixed contacts 114
Flow into the sliding contact 111. This means that the DC motor 61 rotates at high speed.

Then, the discharger 60 introduces the inside air in the vehicle interior 10 into the exhaust duct 11 through the introduction port 11a and discharges it to the outside under the high rotation speed of the DC motor 61. In this case, the passenger compartment 1
Since the atmospheric pressure inside 0 tends to decrease due to the exhaust of the inside air,
Even though the blower 50 is stopped, outside air is introduced into the air duct 20 through the outside air introduction port 22 and the blowout port 2
1 and flows into the vehicle interior 10 and is discharged to the outside by the discharger 60 as described above. In other words, since the outside air that has flowed into the vehicle interior 10 is smoothly discharged to the outside by the exhaust device 60, stagnation of air does not occur inside the vehicle interior 10. Further, at this time, since the blower 50 is stopped, no noise is generated when the blower 50 is driven and the passenger is not bothered.

Further, in the above operation, when the sliding contact 111 of the blower switch 110 is brought into sliding contact with each fixed contact 112, 113, 115 (or 112, 113, 116), the rotation speed of the DC electric motor 61 becomes the resistance 117. (Or resistor 11
7, 118), a medium speed (or a low speed) occurs, and both the amount of air discharged from the discharger 60 and the amount of outside air flowing into the vehicle compartment 10 become a medium amount (or a small amount). Substantially similar effects can be achieved.

Further, in the above-described operation, when the vehicle speed becomes lower than the predetermined vehicle speed, the high level signal from the comparator 170 is inverted to the low level to make the transistor 180 non-conductive, and the relay 190 deactivates the electromagnetic coil 191 to switch the switch 192. And the switching relay 120 demagnetizes the electromagnetic coil 121 to turn the twin contact 124 into the fixed contact 122.
Throw in. Then, the power supply current from the DC power supply B is cut off from the DC motor 61, flows into the DC motor 51, and further flows into the blower switch 110 as described above. As a result, the blower 50 causes the air duct 2 to move at a high rotation speed, a middle rotation speed, or a low rotation speed of the DC motor 51.
The outside air is introduced from the outside air introduction port 22 into the interior of the vehicle 0 and blown into the vehicle interior 10.

Further, in the above-described operation, when the switching damper 40 is switched to the second switching state, the interlocking switch 130 is opened, so the switching relay 120 causes the switching relay 120 to switch to the switch 19 of the relay 190.
The double throw contact 124 is closed to the fixed contact 122 by demagnetization of the electromagnetic coil 121 regardless of whether the switch 2 is opened or closed. Therefore, the blower 50 causes the inside air in the vehicle interior 10 to flow from the recirculation duct 30 into the air duct 20 under the rotation speed of the DC motor 51 similar to the above while the discharger 60 is stopped.
Is introduced to recirculate into the vehicle interior 10 from the air outlet 21.

In the above embodiment, the case where the switching damper 40 and the blower switch 110 are manually operated has been described, but the present invention is not limited to this, and each operation of the switching damper 40 and the blower switch 110 may be automatically controlled. .

[Brief description of drawings]

1 and 2 show the overall construction of a vehicle air conditioner according to the present invention. DESCRIPTION OF SYMBOLS 10 ... Vehicle compartment, 20 ... Air duct, 30 ... Recirculation duct, 40 ... Switching damper, 50 ... Blower, 51, 61
...... DC motor, 60 …… discharging machine, 120 …… switching relay, 130 …… interlocking switch, 192 …… switch.

Claims (1)

[Claims] 1. An inside air passage of a vehicle, which is disposed in an air duct of a vehicle, blows outside air through the air duct when the inside / outside air switching means is in the outside air introduction state, and operates in the inside of the vehicle interior state when the inside / outside air switching means is in the inside air introduction state. In an air conditioner equipped with a blower unit that recirculates the inside air of the vehicle through the recirculation duct into the air duct to blow air into the vehicle compartment, the inside air of the vehicle compartment is exhausted to be disposed on the rear wall of the vehicle compartment. Exhaust means to
When the inside / outside air switching means is in the outside air introduction state, an outside air introduction detection means for detecting the outside air introduction state to generate an outside air introduction detection signal, a speed detection means for detecting a traveling speed of the vehicle and generating the speed detection signal, and the speed detection signal Output signal generating means for generating an output signal when the value of is higher than a predetermined speed value, and permitting the air blowing operation of the air blowing means under the extinction of at least one of the outside air introduction detection signal and the output signal, and the exhaust means. Switching control means for controlling the exhaust operation of the exhaust means and the exhaust operation of the exhaust means under the generation of both the outside air introduction detection signal and the output signal. A vehicle air conditioner characterized by being provided with.