JPH0477521B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to reducing the starting current when simultaneously starting an air compressor for a brake system and a refrigerant compressor in an air conditioner that are connected to the load side of the same power supply device. The present invention relates to a vehicle air conditioning control device that avoids power supply voltage drops due to duplication.

[Conventional technology]

FIG. 5 is a circuit diagram showing a conventional vehicle air conditioning control device disclosed in, for example, Japanese Utility Model Publication No. 55-42650. In the figure, 1 is a control power supply, 2 is a cooling start switch, and 3 is a The first one has a relatively high temperature setting.
4 is a second temperature regulator with a relatively low temperature setting, 5 and 6 are time-limited relays for starting the No. 1 and No. 2 refrigerant compressor circuits, 7 is an air conditioning control device, 8
is the main circuit power supply, 9 and 10 are the electromagnetic contactors for starting the No. 1 and No. 2 refrigerant compressor circuits, and 11 and 12 are the No. 1 and No. 2 refrigerant compressor circuit start-up magnetic contactors.
No. 2 refrigerant compressor circuit, 13 is an air conditioner.

Next, the operation will be explained. First, the cooling start switch 2 in the air conditioning control device 7 is closed, and the operating outputs of the first temperature regulator 3, which has a relatively high set temperature, and the second temperature regulator 4, which has a relatively low set temperature. As a result, the time-limited relay 5 for starting the No. 1 refrigerant compressor circuit and the time-limited relay 6 for starting the No. 2 refrigerant compressor circuit are energized. This excitation operation causes the above-mentioned No.
1. No. 2 refrigerant compressor circuit starting time relay 5, 6
After a certain period of time, the time-limited operation normally open contacts become closed, and the electromagnetic contactor 9 for starting the No. 1 refrigerant compressor circuit and the electromagnetic contactor 10 for starting the No. 2 refrigerant compressor circuit in the air conditioner 13 The coils of the electromagnetic contactors 9 and 10 become closed, and the main circuit power supply 8 is supplied to the No. 1 refrigerant compressor circuit 11 and the No. 2 refrigerant compressor circuit 12, and the refrigerant Operates the refrigerant compressor in the compressor circuit.

[Problem that the invention seeks to solve]

Since the conventional vehicle air conditioning control device is configured as described above, the following problems occur when the air conditioning device and the air compressor for the vehicle brake system are connected to the same power source. be. In other words, since the air compressor and refrigerant compressor start and stop based on their own controllers, in some cases the air compressor and refrigerant compressor may start at the same time, resulting in a power supply voltage drop due to overlapping starting currents. , which may adversely affect air conditioning control equipment and other control equipment.

This invention was made in order to solve the above-mentioned problems, and is designed to prevent a power supply voltage drop due to duplication of starting current when simultaneously starting an air compressor for a brake system and a refrigerant compressor for air conditioning. The object of the present invention is to obtain a vehicle air conditioning control device that controls the air conditioning control system.

[Means for solving problems]

The air conditioning control device for a vehicle according to the present invention incorporates a contact point that detects a drop in air pressure in the air compressor for the brake system and closes the circuit, that is, a start command for the air compressor for the brake system, into the air conditioning control circuit. The air conditioning control circuit controls the startup of the air conditioning refrigerant compressor, and simultaneous startup of the brake system air compressor and the air conditioning refrigerant compressor prevents power supply voltage drop due to duplication of startup current. It is equipped with a control circuit like this.

[Effect]

The vehicle air conditioning control device in this invention includes:
If a command to start the brake device air compressor is issued while the air conditioning refrigerant compressor is stopped, priority is given to starting the brake device air compressor. In addition, if a command to start the air compressor for the brake system is issued while the air conditioning refrigerant compressor is starting up (within a certain period of time), the startup of the air conditioning refrigerant compressor is interrupted, and the air compressor for the brake system is stopped. Prioritize machine startup. Additionally, if a command to start the brake system air compressor is issued after the air conditioning refrigerant compressor has started (after a certain period of time), the brake system air compressor will start immediately. Control.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the circuit configuration of a vehicle air conditioning control device according to an embodiment of the present invention.
In FIG. 1, 14 is an air pressure regulator for starting the brake system air compressor, and 15 is this air pressure regulator 1.
4 is connected to an air compressor start time detection time relay for the brake system provided in the air conditioning control device 7; 16 and 17 are for avoiding simultaneous start of the air compressor and No. 1 and No. 2 refrigerant compressors; This is the first or second electromagnetic relay. In addition, Fig. 2 shows the time relay 15 for detecting the start time of the air compressor for the brake system in Fig. 1.
Movement of the instantaneous normally open contact and time-limited normally closed contact and braking device Air pressure regulator for starting the air compressor 1
This is a time chart showing the movement of 4. Furthermore, FIGS. 3 and 4 are circuit diagrams when the air pressure regulator 14 for starting the brake system air compressor is activated.

Next, the operation will be explained. First, in FIG. 1, when the air pressure for the brake system is insufficient and the air pressure regulator 14 for starting the air compressor for the brake system operates and becomes closed, the air pressure regulator 14 for starting the air compressor for the brake system operates and becomes closed. The coil of the machine startup time detection time relay 15 is excited. The operation of the contacts of the time-limited relay 15 becomes a time chart as shown in FIG. As a result, a circuit as shown in FIG. 3 is constructed, with contact T31 being closed and contact T32 remaining closed. Therefore, the first electromagnetic relay 1
6 and the coils of the second electromagnetic relay 17 are excited. Here, the first and second electromagnetic relays 16 and 1
When coil No. 7 is energized, a circuit as shown in FIG. The coils of the electromagnetic contactors 9 and 10 for starting the No. 1 and No. 2 refrigerant compressor circuits are not excited, and the No. 1 and No. 2 refrigerant compressors are not operated. When a certain period of time has elapsed and the time-limited operation normally closed contact T32 of the brake system air compressor start time detection time-limit relay 15 becomes open, the coils of the first electromagnetic relay 16 and the second electromagnetic relay 17 are de-energized. becomes. As a result, the coils of the time-limited relays 5 and 6 for starting the No. 1 and No. 2 refrigerant compressor circuits are connected to the first temperature regulator 3, which has a relatively high temperature setting, and the second temperature regulator, which has a relatively low temperature setting. The device 4 becomes in a state where it can be excited by its operation. That is, the state in which the operation of the air conditioner is prohibited is canceled. When the first temperature regulator 3 and the second temperature regulator 4 operate, the time-limited operation normally open contacts T1 and T2 close (at the same time, the contact T
11, T21 opens. ). Therefore, air conditioner 1
The coils of the electromagnetic contactors 9 and 10 for starting No. 1 and No. 2 refrigerant compressor circuits in No. 3 are excited, and the normally open contacts become closed, and the main circuit power supply 8 is It is supplied to the refrigerant compressor circuits 11 and 12 and operates the refrigerant compressor within the refrigerant compressor circuit.

Further, when the No. 1 and No. 2 refrigerant compressors are started and a command to start the air compressor is issued after a certain period of time has elapsed, the following operation occurs.

With the cooling start switch 2 closed, No. 1 and
No. 2 refrigerant compressor circuit starting time relay 5 and 6
The coil is energized, and after a certain period of time, the time-limited normally open contacts of the time-limited relays 5 and 6 for starting the refrigerant compressor circuit become closed, and the
No.1 and No.2 refrigerant compressor circuit starting electromagnetic contactor 9
and 10 are excited. This electromagnetic contactor 9,1
The normally open contact of 0 is in the closed state, and the main circuit power supply 8 is turned on.
It is supplied to the No. 1 and No. 2 refrigerant compressor circuits 11 and 12 and operates the refrigerant compressor in the refrigerant compressor circuit. In this state, the air pressure for the brake system is insufficient, and the air pressure regulator 14 for starting the air compressor for the brake system operates and becomes closed, and the time limit relay for detecting the start time of the air compressor for the brake system in the air conditioning control device 7 is activated. Even if coil No. 15 is energized, if the coils of time relays 5 and 6 for starting the No. 1 and No. 2 refrigerant compressor circuits are energized and a certain period of time has elapsed, contacts T11 and T21 are open. Therefore, the coils of the first and second electromagnetic relays 16 and 17 are not excited, and the air compressor for the brake system is started without interrupting the operation of the No. 1 and No. 2 refrigerant compressors.

〔Effect of the invention〕

As described above, according to the present invention, when the air pressure for the brake device decreases, the contact signal of the pressure switch that outputs the start command for the air compressor is input into the air conditioning control device, and When the refrigerant compressor startup signals overlap, the air compressor startup is prioritized, and the air conditioning refrigerant compressor is started after a predetermined delay, which prevents overlapping startup currents and reduces the power consumption of the power supply. Since it is possible to reduce the capacity of the device and reduce the drop in power supply voltage, the device can be made at low cost and has the effect of providing highly accurate control functions.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a vehicle air conditioning control device according to an embodiment of the present invention, Fig. 2 is a time chart showing the operation of the main parts, and Figs. 3 and 4 are a regulator for starting the brake system air compressor. Circuit diagram when activated,
FIG. 5 is a circuit diagram of a conventional vehicle air conditioning control device. In the figure, 7 is an air conditioning control device, 8 is a main circuit power supply, 11 and 12 are No. 1 and No. 2 refrigerant compressor circuits, 13 is an air conditioning device, and 14 is an air pressure regulator for starting the brake system air compressor. , 15 is a time relay for detecting the start time of the air compressor for the brake system.

Claims (1)

[Claims] 1. Time-limiting relay 15 and simultaneous operation avoidance relay 1
6, 17, and a time-limited relay 5 for starting the air conditioner.
6, and an air conditioner 13 mounted on a vehicle.
This is an air conditioning control device for a vehicle that controls starting and stopping of an air compressor for air brakes and an air compressor for air brakes, and the time-limiting relay 15 has an instantaneous normally open contact T31.
and a time-limited normally closed contact T32, which is connected to the normally open contact 14 which closes due to lack of air pressure for the vehicle's brake system and is energized by the closing,
The instantaneous operation normally open contact T31 closes when the time-limited relay 15 is energized, and the time-limited operation normally closed contact T3
2 opens after a predetermined time has elapsed from the start of excitation of the time-limited relay 15, and the simultaneous operation avoidance relays 16 and 17 are connected in series to the instantaneous operation normally open contact T31, the time-limited operation normally closed contact T32, and the air conditioner. It is connected in series to the normally closed contacts T11 and T21 of the time limit relays 5 and 6 for starting, and is energized by the closing of the instantaneous normally open contact T31, the time limit normally closed contact T32, and the normally closed contacts T11 and T21, and its normally closed state. The time-limited relays 5 and 6 for starting the air conditioner have normally closed contacts T11 and T21, and normally closed contacts R1 and R2.
An air conditioning control device for a vehicle is capable of being excited when the circuit is closed, and when it is in the excited state, it operates for a limited time to open the normally closed contacts T11 and T21 to start the air conditioning device 13. 2 The air conditioner 13 to be controlled has two systems of air conditioning refrigerant compressors 11 and 12, and the time limit relay for starting the air conditioner is composed of time limit relays for starting 5 and 6 corresponding to each system. The time limit relay for avoiding simultaneous operation is composed of two systems of relays 16 and 17, and the normally closed contact T11, which is opened by the time limit operation of one of the starting relays 5, is connected to one of the relays 1.
The normally closed contact T21 of the other starting relay 6 is connected to the other starting relay 17, and the normally closed contact R2 of the other starting relay 17 is connected in series to the other starting relay 6. The normally closed contact R1 of one relay 16 is connected in series with one starting relay 5, the other starting relay 6, and the other normally closed contact R2. Air conditioning control device for vehicles.