JPH0143289Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner for a vehicle, and particularly to an air conditioner for a vehicle that reduces the engine load during acceleration of the vehicle.

[Conventional technology]

Generally, a vehicle is equipped with a vehicle air conditioner, which provides conditioned air to the interior of the vehicle.

FIG. 5 shows a conventional vehicle air conditioner.

In the figure, 1 is a ventilation duct, the upstream end of the ventilation duct 1 serves as an air intake section 2, the downstream end serves as an air blowout section 3, and the air blowout section 3 communicates with the interior of the vehicle. The air intake section 2 is composed of an inside air intake port 2A and an outside air intake port 2B.
One side is selectively opened by C. Further, the air blowing section 3 is composed of a face blowing outlet 3A, a defrost blowing outlet 3B, and a foot blowing outlet 3C, and is opened and closed by mode switching doors 3D and 3E.

Reference numeral 4 indicates a blower fan with a variable air flow rate installed at the upstream end of the ventilation duct 1. The ventilation fan 4
Air is taken into the ventilation duct 1 from the air intake section 2, and after being ventilated through the ventilation duct 1, it is blown out from the air blowout section 3 into the vehicle interior. The blower fan 4 is a blower fan driving means 4A.
Driven by.

Further, 5 indicates a cooling cycle. The cooling cycle 5 includes an evaporator 6 installed in the ventilation duct 1, a condenser 7, and a compressor 8.
The evaporator 6, the condenser 7, the refrigerant circulating within the compressor 8, etc. By the cooling cycle 5, the ventilation duct 1
The ventilation inside will be cooled.

Reference numeral 9 indicates a heater core installed downstream of the evaporator 6. The heater core 9 warms the ventilation inside the ventilation duct 1.

Reference numeral 10 indicates an air mix door provided upstream of the heater core 9. The air mix door 1
0 rotates upward and downward in the figure, and depending on the stopping position of the air mix door 10,
The amount of ventilation that contacts the heater core 9 changes.
Therefore, the temperature of the ventilation is determined by the stopping position of the air mix door 10. The air mix door 1
The state where 0 is at the solid line position is called the full cooler position, and the state where it is at the position shown by the one-dot chain line is called the full heater position. The air mix door 10 is driven by an air mix door driving means 10A.

Further, 11 is an inside air temperature sensor that measures the interior temperature Tr of the vehicle interior, 12 is an outside air temperature sensor that measures the outside air temperature Ta, and 13 is a solar radiation sensor that measures the amount of solar radiation Ts. 14 indicates a temperature setting device. The temperature setting device 14 allows input of a temperature desired to be set as the temperature inside the vehicle, that is, a desired set temperature TD.

15 indicates a control means. The control means 15 has a calculation section 16 and a control section 17. The calculation unit 16 calculates the vehicle interior temperature Tr, the outside temperature Ta, and the amount of solar radiation.
Based on Ts and the set temperature TD, a total signal T expressed by the following formula (1) is obtained.

T=aTr+bTa+cTs-dTD...(1) (here, a, b, c, d are constants) The control section 17 also includes a blower control means 1 that controls the blower 4 based on the overall signal T.
8. Door control means 19 for controlling the inside/outside air switching door 2C, air mix door control means 20 for controlling the air mix door 10, mode switching door 3D, 3
The compressor control means 21 includes a mode control means 21 for controlling the compressor E, and a compressor control means 22 for controlling the compressor 8.

FIG. 6 shows an equivalent circuit near the compressor 8 in the vehicle air conditioner described above.

In the figure, 23 is a blower switch, 24 is an air conditioner switch, and 25 is a thermoswitch. Also,
Reference numeral 26 indicates an electromagnetic clutch that transmits the driving force of the engine to the compressor 8. Therefore, when the blower switch 23, air conditioner switch 24, and thermoswitch 25 are all closed, the compressor 8
operates by receiving driving force from the engine. Here, the thermo switch 25 is
The compressor 8 is controlled on and off so that the temperature TM of the evaporator 6 becomes a predetermined temperature. It is constituted by the compressor control means 22 mentioned above.

By the way, an idea has already been proposed in which the operation of the compressor 8 is stopped in order to reduce the load on the engine and improve acceleration when driving on a climbing board or overtaking.

One of them is Utility Model Application No. 50-33443.
Such a device detects the amount of depression of the accelerator pedal and
This is to stop the operation of the compressor.

Further, Japanese Utility Model Application Publication No. 52-49457 has already proposed a device in which the operation of the compressor is stopped for a predetermined period of time when the accelerator opening is greater than a predetermined amount.

[Problem that the invention attempts to solve]

However, the prior art has the following problems.

First, in the device described in the above-mentioned Japanese Utility Model Publication No. 50-33443, the compressor 8 remains stopped for a long time when traveling on a continuous uphill board, and therefore, especially in midsummer, etc. However, there was a problem in that the driver's feeling deteriorated.

Furthermore, in the case of the device described in Japanese Utility Model Application Publication No. 52-49457, when driving uphill and when overtaking, a considerable amount of time is required after the vehicle shifts to the overtaking lane. Because of this, the compressor 18 starts operating in the middle of the process.
As a result, the engine load increases thereafter. For this reason, while moving into the overtaking lane,
There was a problem in that there was a danger that the vehicle would slow down.

Therefore, the present invention was developed in view of the above circumstances, and its purpose is to avoid deteriorating the driver's feeling when driving uphill, and to
To provide an air conditioner for a vehicle that does not cause danger when overtaking.

[Means for solving problems]

The present invention includes an engine load detection means for detecting the load state of the engine, a turn signal detection means for detecting whether or not the turn signal is operating, and a compressor sensor that detects when the engine load is above a predetermined value and the turn signal is operating. and setting means for stopping the operation.

[Effect]

The setting means stops the operation of the compressor when the engine load is above a predetermined value and the turn signal is operating.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. Note that FIG. 1 shows a first embodiment of the present invention.

Reference numeral 31 designates an accelerator detection switch as an accelerator detection means for detecting the amount of depression of the accelerator pedal, that is, the amount of movement of the accelerator pedal. The accelerator detection switch 31 is configured to close when the amount of depression of the accelerator pedal exceeds a predetermined level.

Reference numeral 32 indicates a turn signal detection switch as a turn signal detection means connected in series to the accelerator detection switch 31. The turn signal detection switch 32 is configured to close when the turn signal is activated. Further, 33 indicates an excitation coil connected in series to the blinker detection switch 32.

A relay contact 34 is connected in series to the thermoswitch 25, and the relay contact 34 is closed by the excitation coil 33. These exciting coil 33 and relay contact 34 constitute a setting means 35.

To explain the operation, when the accelerator pedal is depressed more than a predetermined value and the turn signal is activated, the accelerator detection switch 31 and the turn signal detection switch 32 are closed, so that the compressor 8 is stopped by the setting means 35. Therefore, acceleration during overtaking is improved.

Further, FIG. 2 shows a second embodiment of the present invention. It should be noted that the same components as in the first embodiment are given the same reference numerals and their explanations will be omitted.

36 indicates a timer means having an a terminal, a b terminal, a c terminal, and a d terminal. Here, the a terminal is connected in series to the air conditioner switch 24, the b terminal is connected to the air conditioner switch via the accelerator switch 31, the c terminal is connected to the excitation coil 33, and the d terminal is connected to the air conditioner switch 24.
The terminal is grounded. The timer means 36 is configured such that when the input potential at the b terminal becomes high, the output potential at the c terminal becomes high for a predetermined period of time.

Further, the blinker detection switch 32 is connected in series to a diode 37, and connected in parallel between the b terminal and the c terminal of the timer means 36.

Since the accelerator is depressed for a predetermined amount or more, and therefore the accelerator detection switch 31 is closed during acceleration, the excitation coil 33 is energized for a predetermined period of time, and then the relay contact 34 is closed and the compressor 8 is stopped by the setting means 35.

Further, as described above, when the turn signal is activated after the accelerator pedal is depressed beyond a predetermined value, the accelerator detection switch 31 and the turn signal detection switch 32 are activated.
is closed, the relay contact 34 is opened by the excitation coil 33, and as a result, the compressor 8 is stopped by the setting means 35.

Further, FIG. 3 shows a third embodiment of the present invention. Note that the same components as those in the first embodiment are given the same reference numerals and their explanations will be omitted.

Thus, the compressor 38 of this embodiment is a refrigerant input amount adjustable type compressor, and is a so-called variable capacity type compressor. In the compressor 38, a bypass pipe 40 is provided between the refrigerant inflow pipe 39 and the refrigerant outflow pipe 39, and a solenoid valve 41 is interposed in the bypass pipe 40. When the solenoid valve 41 is open, the compressor 38 has a small capacity.

42 is a boost switch as a negative pressure detection means for detecting the negative pressure of the intake manifold;
The boost switch 42 closes when the negative pressure drops below a predetermined value. One side of the boost switch 42 is connected to the air conditioner switch 24, and the other side is connected to the electromagnetic valve 41.

Further, the turn signal detection switch 32 is connected between the boost switch 42 and the excitation coil 33.

When the vehicle accelerates, that is, when the negative pressure in the intake manifold falls below a predetermined level, the boost switch 42 closes and the compressor 38 closes.
has a small capacity. This reduces the load on the engine and therefore improves acceleration. Next, assume that the turn signal is activated and the turn signal detection switch 32 is closed. Then, the relay contact 34 is opened by the excitation coil 33, and as a result, the compressor 38 is stopped. As a result, when changing lanes in an attempt to overtake a vehicle in front, the load on the engine is further reduced and, as a result, acceleration is further improved.

Further, FIG. 4 shows a fourth embodiment of the present invention.

First, numeral 43 is a thermo circuit for controlling the compressor 8 on and off, and the thermo circuit 43 controls the compressor 8 on and off so that the temperature TM of the evaporator becomes a predetermined temperature.
The configuration of the thermo circuit 43 will be explained below.

In the figure, 44 is an operational amplifier, and the + input terminal of the operational amplifier 44 is connected to the power supply E through resistors 45 and 46.
The reference potential is input from Further, a temperature sensor 47 for detecting the temperature TM of the evaporator and resistors 48 and 49 are connected in parallel to one input terminal, and the resistor 48 is connected to an accelerator detection switch 31 and a diode connected in series to each other. 5
0 are connected in parallel. Moreover, the output terminal of the operational amplifier 44 is connected to the base side of the transistor 52 via a resistor 51,
An excitation coil 53 that closes the thermoswitch 25 is connected to the collector side of the thermoswitch 25.

On the other hand, a turn signal detection switch 32 is connected in series to the accelerator detection switch 31, and an excitation coil 54 is connected in series to the turn signal detection switch 32. The excitation coil 54
opens a relay contact 55 connected in series to the thermoswitch 25.

Further, 56 indicates a blower control means for controlling the rotational speed of the blower motor M. The blower control means 5
6 denotes resistors 57 and 58 connected in series to the blower motor M, a low-speed contact LO connected to one side of the resistor 57, and a medium-speed contact LO connected between these two resistors 57 and 58. Contact MO and the above resistance 58
It consists of a high-speed contact HO connected to one side of the switch and a movable contact 59, and the movable contact 59 is connected to a power source E. Moreover, 60 is the above-mentioned low speed contact
The conductive plates provided along the LO, the medium speed contact MO, and the high speed contact HO are shown. One side of the conductive plate 61 is connected to the air conditioner switch 24. In this embodiment, the setting means A is constituted by the excitation coil 54 and the relay terminal 55.

Next, the operation will be explained.

First, the air conditioner switch 24 is closed, and the movable contact 59 of the blower control means 56 is set to the low speed contact.
Suppose you connect to LO. In this case, since a low voltage is applied to the blower motor M, it rotates at a low speed.

On the other hand, at this time, the accelerator detection switch 31,
It is also assumed that the blinker detection switch 32 is open, and therefore the relay contact 55 is closed.

In this case, current flows through the resistor 48 without passing through the accelerator detection switch 31, so the operational amplifier 4
A low potential is input to one input terminal of 4. Therefore, the output terminal of the operational amplifier 44 has a high potential, and as a result, the thermoswitch 25 is closed by the excitation coil 53. Therefore, the compressor 8 is activated.

Next, it is assumed that the accelerator pedal is depressed for a predetermined amount or more and the accelerator detection switch 32 is closed.

In this case, only when the resistance of the temperature sensor 47 of the evaporator becomes lower than in the above case, that is, when the temperature TE of the evaporator rises more than in the above case and the resistance decreases does the operational amplifier 44
One input terminal of is at a low potential, its output terminal is at a high potential, and the thermoswitch 25 is opened. That is, the set temperature of the thermo circuit 43 has increased. Therefore, the time during which the compressor 9 is in operation is reduced, thereby reducing the load on the engine.

The vehicle then moves into the overtaking lane, and thus
The turn signal works and the turn signal detection switch 3
Suppose that 2 is closed. Then, since the excitation coil 54 is excited, the relay contact 55 is opened, and as a result, the compressor 8 is stopped by the setting means A. Therefore, acceleration performance during overtaking is improved.

Therefore, as in this embodiment, when the turn signal is activated,
Stopping the compressor has the following effects compared to stopping the compressor by detecting the rotation angle of the steering wheel. That is,
When the vehicle is in the overtaking lane, the steering wheel is in the straight-ahead state, so it cannot be detected that the vehicle is in the overtaking state. However, in the case of this embodiment, it is possible to detect that the vehicle is in an overtaking state even in such a case.

[Effect of idea]

As explained above, according to the present invention, the engine load detection means detects the load state of the engine, the turn signal detection means detects whether the turn signal is activated, and the engine load detection means detects whether the turn signal is activated or not. Since the compressor is equipped with a setting means for stopping the operation of the compressor when the engine load is above a predetermined value and the turn signal is operating, the following effects are achieved.

That is, when driving on a continuous uphill slope, the turn signal does not operate, the compressor does not stop, and the cooling cycle operates, so the driver does not feel hot air. Further, when the turn signal is activated, that is, when overtaking, the turn signal is activated, and as a result, the compressor is stopped and the engine load is reduced, thereby improving acceleration.
In this case, the compressor will not operate during the process.

[Brief explanation of the drawing]

1 to 4 show the structure of each embodiment of the present invention, and FIGS. 5 and 6 show the structure of the prior art. 1... Ventilation duct, 8... Compressor, 31
... Accelerator detection switch, 32... Turn signal detection switch, 35, A... Setting means.

Claims (1)

[Claims for Utility Model Registration] (1) The upstream end serves as an air intake part, the downstream end serves as an air blowing part, and the air blowing part is connected to a ventilation duct that communicates with the interior of the vehicle, and to which driving force is applied from the engine. In the vehicle air conditioner, the vehicle air conditioner includes a compressor that operates to cool the air in the ventilation duct, and includes an engine load detection means for detecting the load condition of the engine, and an engine load detection means for detecting the load condition of the engine, and a turn signal for determining whether or not the turn signal is operating. An air conditioner for a vehicle, comprising turn signal detection means for detecting whether the compressor is operating, and setting means for stopping the operation of the compressor when the engine load is above a predetermined value and the turn signal is operating. (2) The scope of the utility model registration claim characterized in that the engine load detection means is constituted by an accelerator detection means that detects the amount of depression of the accelerator.
Vehicle air conditioner described in (1). (3) The air conditioner for a vehicle according to claim (1), wherein the engine load detection means is constituted by an intake manifold detection means that detects a negative pressure state of the intake manifold.