JPH0433432Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vehicle equipped with an air conditioner, and in particular,
This invention relates to an air conditioner in which a compressor and a generator with a built-in vacuum pump are interlocked with each other via a belt, and the rotation of an output shaft of an engine is transmitted to them.

[Conventional technology]

Conventionally, the rotation speed of the engine and the rotation speed of the compressor are detected and compared with each other to protect the belt and ensure safety in the event of a failure such as seizure of the rotating shaft of the compressor, causing it to become inoperable. There is a device to ensure that For example, Japanese Patent Application Laid-Open No. 57-35181.

[Problem that the invention attempts to solve]

However, the conventional protection device has a complicated mechanism because it requires a detector for detecting the rotation speed of the compressor and a detector for detecting the rotation speed of the engine output shaft.

Therefore, an object of the present invention is to protect the belt and ensure safety without providing a special detector on the compressor or engine output shaft.

[Means for solving problems]

According to the present invention, a generator having a built-in vacuum pump for supplying negative pressure to a vehicle's brake system and a compressor of an air conditioner that is linked to the generator are connected to the rotation of the output shaft of the engine. In a vehicle in which pressure is transmitted through a belt, a pressure detector detects the pressure in the negative pressure supply line of the vacuum pump, and the pressure detected by the pressure detector rises above a predetermined pressure. There is obtained a vehicle characterized in that it includes a control device that puts the compressor into a non-operating state when the compressor is in a non-operating state.

〔Example〕

The present invention will be explained below based on examples.
Figure 1 is an overall diagram, where 1 is an engine, 2 is an air conditioning compressor, and 3 is a generator. Inside the generator 3, a vacuum pump 5 for supplying negative pressure to a vacuum booster 4 of a brake device (not shown) is provided so as to operate in conjunction with the power generation mechanism. A pressure detector 6, ie, a vacuum switch, detects the negative pressure in the negative pressure supply line of the vacuum pump 5, and operates to open the switch when the pressure exceeds a predetermined pressure. Reference numeral 7 denotes an electromagnetic clutch control circuit including an abnormality display to be described later, which operates an electromagnetic clutch 8 attached to the compressor 2 in accordance with the operation of the vacuum switch 6. Furthermore, referring to Fig. 2 A in addition to Fig. 1, 9 is the first belt;
It is stretched between a pulley 1' provided on the output shaft of the engine 1 and a pulley 2' of the compressor 2. 10
is a second belt, which is stretched between the pulley 2' of the compressor 2 and the pulley 3' of the generator 3. still,
As shown in FIG. 2B, one belt 11 may be stretched around all the pulleys 1', 2', and 3'.

Next, the electromagnetic clutch control circuit 7 including the abnormality display will be explained based on FIG.

By default, the output of 21 is high when the power is turned on.
In the T-FF circuit, when the vacuum switch 6 is activated and the input changes from the H level to the L level, the output is held at the L level. 22
is a thermostat that detects the temperature of the air blown into the car from the air conditioner, and turns on when the temperature exceeds a certain level. 23 is an AND circuit,
The output of the T-FF circuit 21 and the thermostat 22
The output is the input. Reference numeral 24 denotes a switching transistor, which becomes energized by the output of the AND circuit 23 and causes current to flow through the relay 25. 28 is a switching transistor, and an inverter 26
The output of the AND circuit 23 causes the LED 27 to
A current is passed through. 8 is an electromagnetic clutch, relay 25
The rotation of the pulley 2' is transmitted or not transmitted to the compressor 2.

In such a configuration, assuming that the compressor 2 is operating normally, the rotation of the engine 1 is normally transmitted to the generator 3 via the belts 9 and 10, and the rotation of the engine 1 is normally transmitted to the generator 3 via the belts 9 and 10. The vacuum pump 5 applies a pressure below a predetermined pressure (negative pressure) to the vacuum booster 4. Therefore, Bakyumu Switch 6
is closed, the input of the T-FF circuit 21 is at H level, and the output is also at H level.
Therefore, one input of AND circuit 23 is maintained at H level. On the other hand, the thermostat 22 constantly detects the temperature of the blown air.
Now, if the air conditioner is a cooling device, for example, if the temperature drops too much, the thermostat 22 becomes non-conductive, and the B
Since the power supply voltage is no longer applied to the other AND circuit, one of the inputs of the AND circuit 23 becomes L level. Then, no operating power is applied to the base of the switching transistor 24, and the transistor 24
becomes non-conductive. No current flows through the relay 25, and the switch 25' is opened. As a result, the electromagnetic clutch 8 is disengaged, only the pulley 2' rotates, and the rotation of the engine 1 is not transmitted to the compressor 3.
is stopped or in a non-operating state. Therefore, it is possible to prevent the temperature of the blown air from lowering more than necessary.

Also, when the temperature of the blown air is high, the thermostat 22 becomes conductive, and both inputs of the AND circuit 23 become H.
level, and the switching transistor 24 becomes conductive. Therefore, current flows through the electromagnetic clutch 8 and the clutch is engaged against a spring (not shown), and the rotation of the pulley 2' is transmitted to the compressor 3, so that the temperature inside the vehicle is reduced by the operation of the compressor 3. descend.

By the way, if the rotating shaft of the compressor 2 becomes inoperable due to some cause such as seizing while the compressor 3 is in operation, the pulley 2'
An overload is applied to the belt 9, and the belt 9 slips on the pulley 2'. Therefore, the rotation transmission rate to the generator 3 decreases, and the operation of the vacuum pump 5 in the generator 3 also decreases, so the pressure in the negative pressure supply line rises above a predetermined pressure (negative pressure), The vacuum switch 6 is opened. As a result, the input of the T-FF circuit changes from H level to L level, the output of that circuit is held at L level, and one input of the AND circuit becomes L level.
No current flows to the magnetic clutch 8, the clutch is in a disengaged state, and the LED 27 is energized, indicating an abnormality in the compressor 2.

Therefore, power transmission between the pulley 2' and the compressor 3 is cut off, and only the pulley 2' rotates.

After that, the generator 3 whose rotation has decreased once,
The vacuum pump 5 operates normally, the vacuum switch 6 is closed, and the input to the T-FF circuit 21 becomes H level. However, T-
In the FF circuit, once the input becomes L level, after that,
Even if there is an input at H level, the output remains at L level, so the output of the T-FF circuit 21 remains at L level.

Therefore, the electromagnetic clutch 8 remains in a disengaged state, without damaging the belts 9 or 11, and the rotation of the engine is transmitted to the generator with built-in vacuum pump, and then to the vacuum booster of the brake system. The negative pressure supply is not interrupted. In addition, the rotation of the engine 1 is not transmitted to the compressor 2 and the compressor is not forced to operate, thereby protecting the compressor.

[Effect of idea]

As described above, according to the vehicle of the present invention, when the compressor is in an abnormal operating state due to seizure of the rotating shaft, etc., and the rotation of the compressor decreases, the engine speed decreases due to the decrease in rotation of the generator interlocked with the compressor. When the operation of the compressor pump decreases, the vacuum switch is activated, the electromagnetic clutch is disconnected by the electromagnetic clutch control circuit, and rotation transmission between the compressor's rotating shaft and the pulley is cut off. Therefore, damage to the belt due to slip between the pulley and the belt can be prevented, and the safety of the vehicle can be ensured without interrupting the negative pressure supply to the vacuum booster of the brake device. Since a malfunctioning compressor is not forced to rotate, the compressor is prevented from further malfunctioning and has the advantage of being easily repaired.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an overall diagram, Fig. 2 is a state diagram in which belts are attached to the engine, compressor, and generator; A is a diagram in which two belts are used; B is a diagram using one belt, and FIG. 3 is an electromagnetic clutch control circuit diagram. In the diagram, 1 is the engine, 2 is the air conditioning compressor, and 3
is a generator, 1', 2', and 3' are pulleys, 4 is a vacuum booster, 5 is a vacuum pump, 6 is a vacuum switch, 7 is an electromagnetic clutch control circuit including an abnormality display, 8 is an electromagnetic clutch, 9, 10, and 11 are belts.

Claims (1)

[Scope of utility model registration request] The rotation of the engine's output shaft is transmitted via a belt to a generator with a built-in vacuum pump for supplying negative pressure to the vehicle's brake system and to an air conditioner compressor that is linked to the generator. In a vehicle configured as follows, a pressure detector detects the pressure in the negative pressure supply line of the vacuum pump, and when the pressure detected by the pressure detector rises above a predetermined pressure, the compressor and a control device for placing the vehicle in a non-operating state.