JP2705229B2 - Vehicle air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner used in a vehicle such as a bus, for example, so that rapid cooling control at startup can be effectively performed. To a vehicle air conditioner.

2. Description of the Related Art An air conditioner installed in a vehicle such as a large bus includes a main engine for the vehicle and a sub-engine for driving the air conditioner. Then, for example, in a state where a passenger gets off and stands by in a parking lot, the main engine for the vehicle is stopped, and only the sub-engine for air conditioning is driven to cool the passenger compartment.
However, in a parking lot or the like at a sightseeing spot, problems such as noise and exhaust gas become important, and when the vehicle is stopped, it is required to stop both the main engine and the sub engine.

Therefore, in a state where the outside air temperature is extremely high, the temperature in the passenger compartment becomes extremely high while the air conditioner is stopped, and it is necessary to start the air conditioner immediately before passengers take in and cool down the passenger compartment rapidly. . In other words, when the air conditioner is started, the sub-engine that drives the air conditioner is operating in the high (Hi) mode, which is the highest state, and after getting in, the vehicle is compared with the high mode state. The control mode is selectively controlled to a middle (Me) mode, a low (Lo) mode, or an ultra low (U-Lo) mode of the normal mode in which the number of revolutions of the sub engine is sequentially reduced.

In such a vehicle air conditioner, the outside air temperature,
In relation to the inside air temperature in the guest room, etc., the mode is selectively set and controlled from the Hi mode to the U-Lo mode,
In the Hi mode state, the rotation speed of the sub-engine for air conditioning is greatly increased, and the noise is inevitably increased. For example, when the mode is set to the Hi mode in a state where a passenger is riding, not only does the passengers feel uncomfortable due to an increase in noise, but the fuel consumption also increases.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and in particular, does not cause a state in which noise is increased in a state where a passenger is present, and an air conditioner is not required. Accordingly, it is an object of the present invention to provide a vehicle air conditioner particularly suitable for a large vehicle such as a bus which can give a passenger a good feeling of comfort without unnecessary consumption of fuel.

Means for Solving the Problems In the vehicle air conditioner according to the present invention, when the air conditioner is started by operating a switch or the like, the set temperature is detected together with the outside air temperature and the inside air temperature, and the detection is performed. The air conditioning mode is selected according to the result. In this case, for example, in a state where the difference between the inside air temperature and the set temperature is large, the inside of the cabin is rapidly cooled as the high mode, and when the inside of the cabin reaches the predetermined temperature state, the mode is shifted to the middle or low normal mode, and thereafter. Is set so as not to be set to the high mode in the normal inside air temperature control.

[Operation] In the vehicle air conditioner configured as described above, for example, when the passenger is unloaded and parked for a long time, and the passenger returns, the air conditioner is activated. You. If the cabin temperature is extremely high at the time of this start-up, the air conditioner is operated in the Hi mode, the cabin is cooled rapidly, and when the cabin reaches the predetermined temperature state, the normal mode is set. Will be migrated to. After that, the air conditioner is controlled within the normal mode, without shifting to the high mode, without operating the sub engine at high output, and generating unnecessary noise. In addition, fuel efficiency for air conditioning is also effectively reduced, so that passengers and the like do not feel uncomfortable.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration applied to a cooling device for a bus. First, a starting operation of an air conditioner is performed by a starting means 11 such as a switch.

Here, this air conditioner is installed in, for example, a large bus, and is driven by a sub-engine for air conditioning different from the main engine installed in the bus, and by starting this sub-engine, the refrigerant compression of the air conditioner is performed. Machine is started.

The air conditioner is provided with an outside air temperature sensor based on a thermistor for measuring the temperature outside the bus, an internal air temperature sensor based on a thermistor for measuring the temperature in the passenger compartment, and a temperature setting unit based on a thermistor for setting an air conditioning target temperature.
If started by 11, the control mode is selected by the temperature measuring means 12 by these sensors and the temperature setting means. For example, in a state where the difference between the inside air temperature and the set temperature is large, the high mode is set by the high (Hi) mode setting means 13 so that the inside of the passenger compartment is rapidly cooled. When the difference between the inside air temperature and the set temperature is small, the middle (Me) mode setting means 14 or the low (L)
o) In the normal mode setting means of the mode setting means 15,
The cooling temperature control is executed.

In each of the mode setting units 13 to 15, the temperature measuring units 16 to 18 measure the outside air temperature and the inside air temperature, respectively, and shift to the next mode in accordance with the measurement results. In this case, rapid cooling is performed in the Hi mode setting means 13, and when the temperature in the passenger compartment has decreased to a predetermined temperature, it is detected in the temperature measuring means 16, and the process proceeds to the Me mode setting means 14 or the Lo mode setting means. To be done. Then, no mode setting means 13 to 15 are transferred to the Hi mode setting means 13.

FIGS. 2A to 2C show the flow of control of such an air conditioner. First, as shown in FIG. 2A, a power switch of the air conditioner is used to start the operation of the air conditioner. Is turned on, the control power supply of the air conditioner is turned on, and the sub-engine for driving the air conditioner is started. When the startup operation is performed in this way, first, the step
At 101, the outside air temperature and the inside air temperature are respectively detected as resistance values by an outside air temperature sensor and an inside air temperature sensor each constituted by a thermistor. At the same time, the set temperature is also detected as a resistance value. In step 102, a combined resistance R, which is a total value of resistance values corresponding to the outside air temperature, the inside air temperature, and the set temperature, is calculated.

In the vehicle air conditioner, the combined resistance R of the inside air thermistor, the outside air thermistor and the set temperature resistance is regarded as the cooling load, and the mode of the air conditioning control amplifier is determined.

That is, the combined resistance R is conventionally used for setting switching of the operation mode of the air conditioner, such as Hi, Me, Lo, and U-Lo, as shown in FIG. 3A, for example.

In step 103, the combined resistance R is compared with a preset value A2. If it is determined that the combined resistance R is smaller than the set value A2, the process proceeds to step 104.

Here, in the case of the conventional mode switching control shown in FIG. 3, the mode directly shifts to the Hi mode.
In 4, the difference between the inside air temperature and the outside air temperature is, for example, 5 ° C.
It is determined whether or not the air temperature is greater than 30 ° C., or whether or not the inside air temperature is 30 ° C. or more.
If "No" is determined in step 104, the mode is set to the Me mode in which the process proceeds to step 106. Step 105 or 10
Proceeding to 6, it is confirmed in step 107 or 108 that each mode state has passed 250 ms. If it is confirmed in step 107 that the Hi mode has elapsed for 250 ms, the process returns to step 101 to detect the outside air temperature, the inside air temperature, and the set temperature, and executes the process of calculating the combined resistance R in step 102. I do. In Step 108, the Me mode is set to 2
If it is confirmed that the process has continued for 50 ms, the outside air temperature, the inside air temperature, and the set temperature are detected in step 109, and the combined resistance R is obtained in step 110.

If it is determined in step 103 that the combined resistance R is larger than the set value A2, or if the combined resistance R is obtained in step 110, the process proceeds to step 111 where the combined resistance R is compared with the set value A4. If it is determined in step 111 that the combined resistance R is smaller than A4, the process proceeds to step 112 shown in FIG. 2B, and the Me mode is set.
It is determined in step 13 that 250 ms has elapsed, and the Me mode is maintained during that time. If it is determined in step 113 that the time of 250 ms has elapsed, the routine proceeds to step 114, where the outside air temperature, the inside air temperature, and the set temperature are detected, and in step 115, the combined resistance R is calculated. Then, in step 116, the combined resistance R is compared with the set value A4 again, and the process returns to step 112 in the state of “R ≦ A4” to maintain the Me mode as it is. If it is determined in step 116 that the combined resistance R is larger than the set value A4, the process proceeds to step 117, where the combined resistance R is compared with the set value A6.

If it is determined in step 111 that the combined resistance R is larger than the set value A4, step 11 shown in FIG.
Proceed to 8. In this step 118, the combined resistance R becomes equal to the set value A3.
It is determined whether it exists between A6 and A6, and if the determination of “yes” in step 118 proceeds to step 119, the mode is set to Lo mode. If the determination is "no", the process proceeds to step 120 to set the U-L0 mode. Step 117 in FIG. 2B
In step 119 or step 120, when "yes" is determined or "no" is determined.
Proceed to.

Lo mode of step 119 and step 120 and U-
The state of the Lo mode is held for 250 ms in steps 121 and 122, respectively, and thereafter proceeds to steps 123 and 124, respectively, to detect the outside temperature, the inside temperature, and the set temperature, and to calculate the combined resistance R in steps 125 and 126. I do.

In step 127, it is determined whether or not the combined resistance R calculated in step 125 is between the set values A3 and A6.
When the determination is "yes", the process returns to step 119, where Lo
Maintain mode. If the answer is “No”,
Proceeding to step 128, it is determined whether or not the combined resistance R is smaller than the set value A3.
Returning to step 112, the mode is set to the Me mode. If it is determined that the combined resistance R is larger than A3, the process proceeds to step 12
Proceed to 0 to set the U-L0 mode.

In step 129, the combined resistance R calculated in step 126 is compared with the set value A5. When it is determined that the combined resistance R is smaller than A5, the process returns to step 120, where
o Maintain mode. Then, in step 129, the combined resistance R
If it is determined that is larger than the set value A5, step 13
Proceeding to 0, it is determined whether or not the combined resistance R is between the set values A3 and A6. If the determination is "yes", the flow proceeds to step 119 to set the Lo mode. On the other hand, when the determination is "no", the process proceeds to step 112 in FIG. 2B, and the Me mode is set.

In this air conditioner, when the switch is turned on, the Hi mode is set according to the state of the inside air temperature and the outside air temperature. When the Hi mode shifts to the Me mode once, Never return to Hi mode again. That is, the control is executed in a state as shown in FIG. 3 (B).

In the embodiment, the combined resistance R of the thermistor resistance corresponding to each of the outside air temperature, the inside air temperature, and the set temperature is used for the mode determination during the cooling operation of the air conditioner. However, the present invention is not limited to such a combined resistance, and a heat load may be obtained by calculation, and this may be used for control. Further, mode selection may be performed by PI control or PID control, or control may be executed based on the difference between the outside air temperature and the inside air temperature.

Further, in the embodiment, four modes of Hi, Me, Lo, and U-L0 are set, but the state of the mode selection can be arbitrarily selected. Also, the calculation time of the combined resistance R is shown as 250 ms, but this can also be arbitrarily selected. In step 104, the condition for setting the Hi mode after the switch is turned on is a condition in which the difference between the inside air temperature and the outside air temperature is 5 ° C. or more, or
Although it is assumed that the temperature exceeds 30 ° C., the set temperature can be appropriately selected and may be set in accordance with the use conditions and the like, and the control value is appropriately set.

Further, the present invention is not limited to the cooling device, but can be applied to a heating device (heat pump) driven by an engine.

Furthermore, in the above-described embodiment, the configuration is such that the mode does not return to the Hi mode again according to the combined resistance value. However, other conditions, for example, when a switch is operated by the driver, or particularly when the internal temperature becomes abnormally high. For example, the mode may be returned to the Hi mode again.

By doing so, in a normal cooling and heating load,
A low noise and low fuel consumption can be achieved without the Hi mode, and a strong cooling and heating capacity can be obtained especially when the load becomes high or when the occupant desires.

In the embodiment as described above, in particular, the conditions for executing the Hi mode are different from other mode switching conditions, and the mode is hardly changed to the Hi mode, so that low noise and low fuel consumption can be achieved. Moreover, at the start of air conditioning, powerful air conditioning in the Hi mode can be performed.

[Effects of the Invention] As described above, according to the vehicle air conditioner according to the present invention, the vehicle is parked in a parking lot or the like for a long time, and only when the cooling device is started in a state where the body temperature is extremely high. , Is set to the Hi mode. After that, after the mode is shifted to the Me mode, the mode is not shifted to the Hi mode again but is controlled in a state of the Me mode or less. Therefore, after the passenger has boarded, unless the Hi mode setting operation is forcibly performed by a specified switch control or the like, the Hi mode is not set, and the problem of noise due to high rotation of the sub engine driving the air conditioner is caused. In addition, the problem of high fuel efficiency can be effectively improved, and in particular, the problem of pollution caused by noise and exhaust gas at the time of parking in a parking lot at a tourist spot can be effectively dealt with.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a vehicle air conditioner according to an embodiment of the present invention, FIG. 2 is a flowchart illustrating a flow of control of the air conditioner, and FIGS. It is a figure explaining the relation between combined resistance and cooling setting ability in the conventional example and the above-mentioned example. 11 start means, 12 temperature setting means, 13 Hi mode setting means, 14 Me mode setting means, 15 Lo mode setting means, 16-18 temperature measuring means.

Claims (1)

(57) [Claims] 1. An air conditioner driven by a dedicated air conditioning engine mounted on a vehicle, a temperature measuring means for detecting an air conditioning set temperature together with an outside air temperature and an inside air temperature of the vehicle, and detecting a start operation of the air conditioning device. In the state where the start-up is detected by the start-up detection means, the rotation speed of the air-conditioning dedicated engine is adjusted so as to exhibit the highest air-conditioning capacity in response to the measurement result from the temperature measurement means. Mode setting means for selecting either a high mode for setting the highest state or a normal mode for performing normal inside air temperature control, and measuring by the temperature measuring means in a state where the high mode is selected and set by the mode setting means. Means for detecting a change in the inside air temperature and performing a transition to the normal mode. Vehicle air conditioner, wherein the return to the mode is to be prevented.