JPS588571Y2 - Emergency equipment for automatic air conditioners for automobiles - Google Patents

Description

[Detailed description of the invention] An air mix system is used as an air conditioner for automobiles, in which cold air that has passed through an evaporator and warm air that has passed through a heater are blown into the vehicle interior, either as is or after being mixed in an appropriate amount. There is.

Some air mix type air conditioners are equipped with a control circuit consisting of a complicated electronic circuit to automatically maintain a desired air conditioning state.

In such automatic air conditioners, malfunctions in the automatic control device, particularly in the temperature control section or rotational speed control section of the intake fan, may cause the temperature to blow out, for example, in midsummer.
It would be extremely inconvenient if cold air was blown out in the middle of winter or if the wind blowing became weak.

This invention was devised for the purpose of providing an emergency device that can temporarily maintain the minimum level of cabin comfort in the event of a failure of an air-mix type automatic air conditioner for automobiles. If an abnormality occurs in the automatic control of temperature or fan rotation speed, move the temperature setting lever to disconnect the automatic control circuit and return the cabin to the simplest and highest heating state (hereinafter referred to as full heating). (hereinafter referred to as "total cooling") or the highest cooling state (hereinafter referred to as "total cooling").

Next, this invention will be explained with reference to illustrated embodiments.

FIG. 1 is a side view illustrating an example of a conventionally used air mix type automobile air conditioner, in which outside air or inside air from the vehicle cabin is sucked in by an intake fan 1 and passed through an evaporator 2. Intake is through mixing door 3
The amount of air that passes through the heater 4 is adjusted depending on the degree of opening and closing of the air vents, and air at appropriate humidity is blown into the vehicle interior from the upper air outlet 5, the lower air outlet 6, and the air blower lower to the defroster.

FIG. 2 shows an example of a control panel mounted on the driver's seat, in which an air conditioning mode setting lever 9 and a vehicle interior temperature setting lever 10 are used to set the air conditioning state.

In the drawing, move the upper mode setting lever 9 to 1'-DEF.
When placed in position J, the intake fan rotates at maximum speed, the mixing door is fully closed, and all intake air is sent through the heater 4 to the blowout lower of the defroster.

That is, all states are obtained. When lever 9 is placed in the rAUTOJ position, all systems are automatically controlled and the
In the position ``■'', the air conditioner is rapidly cooled and heated, and in the ``BI-LEVELJ'' position, cold air is blown from the upper air outlet 5 and warm air is blown from the lower air outlet 6 into the vehicle interior at the same time, which is the so-called pie level mode.

The lower vehicle interior temperature setting lever 10 sets the temperature inside the vehicle interior to the temperature indicated by the upper temperature scale.

In this control panel section, contacts of the emergency device of the present invention are provided inside both left and right ends of the scale.

FIG. 3 shows an embodiment of the electrical circuit used in the present invention.

In Fig. 3, P, T, and C are variable resistors for setting the vehicle interior temperature, and levers that drive these variable resistors P, T, and C,
That is, one emergency contact 10a is attached to the vehicle interior temperature setting lever 10, and the other contacts 11, 12 are provided in the control panel sections at both ends of the temperature scale.

That is, for example, when the lever is moved to the rightmost end beyond the 30° C. scale, the all-mix contact 11 is closed, and conversely, at the leftmost end, the all-mix contact 12 contacts the contact 10a of the lever 10 and is closed.

Assuming that contacts 10a and 11 are now in contact and the circuit on all sides is closed, current flows through diode DItD2, current flows through relay RY, and moves conductor piece 13 in the direction of the arrow.

As a result, the contact point RYI of this relay is switched to disconnect the automatic control circuit, and at the same time, the transistor TR1 becomes conductive as shown by the arrow, solenoid valve sv1 is operated, and the mixing door 3 is completely closed by the power servo 8.

As a result, all of the intake air that has passed through the evaporator and turned into cold air passes through the heater, so that all conditions can be obtained.

Conversely, when the lever 10 is moved to the leftmost position, the contact 12 for all contacts contacts the contact 10a and is closed, and the current flows through the diodes D3 and D4. : The conductor piece 13 of the relay RY,' moves in the direction of the arrow, and the contact RY is similarly switched.

As a result, the automatic control circuit is disconnected, and at the same time, the transistor TR2 becomes conductive as shown by the arrow, the solenoid valve SV2 is operated, and the mixing door 3 is fully opened by the power servo 8, and all of the cold air that has passed through the evaporator 2 is Since the air is blown into the passenger compartment without passing through the heater 4, all conditions can be obtained.

In all of these cases, DI
Since either sD3 is conductive, the transistor TR
53 is opened and thus relay RY7' is no longer energized, its contact RY7 is directly connected to the O side and the motor fan rotates at maximum speed.

RY8. RY9 is a relay contact for rotating the motor fan at medium speed or low speed, but since it is not related to this invention, its explanation will be omitted.

The emergency device of the present invention is configured and operates as described above, so that when the automatic control device malfunctions in extremely cold or extremely hot times when heating or cooling is absolutely necessary, the temperature setting lever can be operated to temporarily provide all or all This device rotates the fan at maximum speed to maintain a minimum level of comfort in the vehicle interior, and is an extremely important device for preventing failures in automatic control equipment.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an air mix type automobile air conditioner in which the present invention is implemented, Fig. 2 is a front view showing an example of the control panel section of the automatic air conditioner, and Fig. 3 is the present invention. FIG. 2 is a circuit diagram showing an example of an electric circuit. 1... Intake fan, 2... Evaporator, 3... Mixing door, 4... Heater, 5... Upper air outlet, 6 ...Lower air outlet, 7... Air outlet to defroster, 8...
...Power servo, 9...Mode setting lever 10...Temperature setting lever, 10a, 11゜12...Contact, 13...Conductor piece ,RY
1', RY7'...Relay, RYI, R
Y7...Contact point.

Claims (1)

[Scope of utility model registration request] In an air mix type automobile air conditioner, contacts 11 and 12 that are closed by contacting the lever 10 are provided at both ends of a vehicle interior temperature setting lever 100 provided on a control panel, and when one of these contacts 1L12 is closed, An emergency device for an automatic air conditioner for an automobile, which is equipped with an electric circuit that sets an intake fan 1 to the maximum rotation speed and fully closes or fully opens a mixing door 3 based on the weather condition.