JP2015000648A - Vehicle heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle heating apparatus that is improved in comfortability by adjusting, based on calorie, which air blown out from a plurality of heater units has, the quantity of warm air blown into a vehicle interior.SOLUTION: The vehicle heating apparatus, which heats a vehicle using cooling water of an internal combustion engine, comprises: a heater unit 3 having a heater fan 31 that exhausts warm air heat-exchanged in a built-in heat exchanger into the interior of the vehicle; a first temperature sensor 11 that detects temperature of cooling water to be introduced into the heater unit 3; a second temperature sensor 12 that detects temperature of the cooling water to be drained from the heater unit; and a fan rotation speed control device 8 that changes rotation speed of the heater fan 31 on the basis of a detection temperature difference between the first temperature sensor 11 and the second temperature sensor 12, where the fan rotation speed control device 8, when the detection temperature difference increases, reduces the rotation speed of the fan heater.

Description

  The present invention relates to a vehicle heating device, and more particularly to control of hot air blowing temperature during heating of a route bus.

The internal combustion engine mounted in the vehicle is cooled, and the heated coolant is circulated through a heater unit disposed in the vehicle interior. The heat exchanger built in the heater unit cools the coolant and the vehicle interior. 2. Description of the Related Art A heating apparatus that widely exchanges heat with air and discharges warmed vehicle interior air into the vehicle interior by a heater fan provided in the heater unit is widely used.
In particular, in a route bus or the like, a plurality of heater units are disposed on the upper surface of the vehicle with a space in the front-rear direction.
Each heater unit can individually change the rotation speed of the fan by a manual switch operation provided on the driver side.
Therefore, in order to adjust the vehicle interior temperature, the temperature of the vehicle interior is adjusted by adjusting the number of revolutions of the heater fan with a manual switch corresponding to the heater unit.

If the room temperature is low, operate to increase the rotation speed of the heater fan, and if the room temperature is not so low, adjust the air volume to be blown from the heater unit by decreasing the rotation speed of the heater fan. doing.
Further, in the case of a route bus, the front door on the front side and the middle door with a large middle portion are frequently opened and closed, and it is necessary to change the rotation speed of the heater fan depending on the location in the passenger compartment.
However, passengers who are in a position away from the driver's seat are in a situation where it is difficult for the driver to easily request adjustment even if his feet are hot.

Patent document 1 is disclosed as a related prior art for controlling the temperature in the passenger compartment.
According to Patent Literature 1, a cooling water passage for the internal combustion engine is provided with a cooling water heater circuit that further heats the cooling water after cooling the internal combustion engine with an exhaust heat exchanger provided in the exhaust pipe and then guides it to the heating unit. A configuration is disclosed in which a heater fan that blows warm air heated by a heating unit into a vehicle compartment and a heater fan switch that controls driving of the heater fan are disclosed.
Further, a cooling water temperature switch for detecting the cooling water temperature and a heater strengthening switch for instructing heating enhancement are provided, and the structure branches to an exhaust pipe provided with an exhaust heat exchanger and a bypass exhaust pipe bypassing the exhaust heat exchanger In addition, a switching valve is provided at the branch portion.
The switching valve is a heater fan switch, a heater strengthening switch, and a cooling water temperature switch. When heating the heater fan is operating, when the cooling water temperature is below a predetermined value and the heater strengthening switch is turned on, an exhaust heat exchanger is provided. Further, a technical disclosure has been made in which an actuator is provided so that the exhaust pipe is opened and the bypass exhaust pipe is closed.

  By doing in this way, heating temperature is controlled by switching between heating by cooling water and heating by cooling water heated by exhaust heat.

No. 3-4566

However, in Patent Document 1, when the heater strengthening switch is ON, the cooling water is heated by heating the cooling water through the exhaust heat exchanger, and when the cooling water temperature exceeds a predetermined value, the cooling water is discharged from the exhaust heat. It just bypasses the exchange.
Therefore, it is not sufficient for finely adjusting the temperature in the passenger compartment to improve the comfort of passengers (occupants).
Therefore, in the case of a route bus, there is a possibility that unpleasant sensation is caused by applying excessive warm air to passengers.

  Therefore, the present invention has been made in view of such problems, and comfort is improved by adjusting the amount of hot air blown into the passenger compartment based on the amount of heat of air blown from a plurality of heater units. It aims at provision of the heating device for vehicles which aimed.

The present invention achieves such an object, and is a vehicle heating device that heats a vehicle interior using cooling water of an internal combustion engine,
A heater unit having a fan which is disposed in the vehicle interior and discharges warm air heat-exchanged by a heat exchanger into the vehicle interior;
A first temperature sensor for detecting a temperature of the cooling water introduced into the heater unit;
A second temperature sensor for detecting a temperature of the cooling water flowing out of the heater unit;
A fan rotation speed control device that changes the rotation speed of the fan based on a detected temperature difference between the first temperature sensor and the second temperature sensor;
The fan rotation speed control device can provide a vehicle heating device characterized in that the fan rotation speed is lowered when the detected temperature difference is increased.

In such an invention, an increase in the detected temperature difference indicates that the amount of heat released from the heater unit into the vehicle compartment is large.
Therefore, if the detected temperature difference is large, by reducing the fan speed, high warm air is prevented from directly hitting humans for a long time, ensuring comfort in the passenger compartment and reducing low temperature burns. Can be prevented.

  According to the present invention, there is provided a vehicle heating apparatus that adjusts the amount of hot air blown from each of the plurality of heater units based on the temperature of air blown from the plurality of heater units, thereby improving comfort in the passenger compartment. Can be provided.

The schematic layout which implemented the heating apparatus of this invention in the route bus is shown. The schematic block diagram of this invention is shown. The external appearance perspective view of the heater unit which has arrange | positioned the cooling water sensor is shown. The flowchart of an example of the fan rotation control of this invention is shown.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.
In addition, when showing directionality, the front and rear, right and left, and up and down are described on the basis of the state seated in the driver's seat.

FIG. 1 is a schematic layout diagram showing a heating device 1 mounted on a route bus 10 as an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of each device.
An internal combustion engine (not shown) is disposed behind the route bus 10, and a radiator 51 that cools the cooling water heated by cooling the internal combustion engine is disposed.
In the cooling water passage that connects the radiator 51 and the internal combustion engine, the cooling water that has cooled the internal combustion engine is introduced into the radiator 51.
In the radiator 51, the cooling water is cooled by exchanging heat with the outside air in the heat exchanger of the radiator 51.
The cooled cooling water is pumped into a water gallery (not shown) of the internal combustion engine by an engine water pump 52 driven by the internal combustion engine, circulates through a circuit that cools the internal combustion engine and returns to the radiator 51 again. Yes.

  The heating device 1 includes a first water cock 55 that takes out or stops a part of cooling water flowing from the engine to the radiator 51, a heating water pipe 50 that is connected to the first water cock 55, and cooling water. The cooling water is mounted on the downstream side of the pipe 50 and connected to the downstream side of the engine water pump 52 (between the engine water pump 52 and the engine water gallery). (Not shown), the second water cock 56 to be returned to or stopped, a pressurized water pump 53 disposed on the downstream side of the first water cock 55 to pressurize the flow of the cooling water, and the cooling water temperature to be raised. The preheater unit 6 is disposed at various locations in the bus passenger compartment, and is disposed in series in the cooling water pipe 50 and disposed below the seat (not shown). A plurality of rear heater units 3 and a front heater unit 2 for a driver's seat, and a plurality of rear heater units 3 and front heater units 2, which are arranged in the vicinity of the cooling water inlets and detect the temperature of the introduced cooling water. The temperature sensor 11, the second temperature sensor 12 that is disposed in the vicinity of the cooling water outlet of each of the plurality of rear heater units 3 and the front heater unit 2, detects the derived coolant temperature, the first temperature sensor 11, Based on the temperature difference detected by the two temperature sensors 12, a fan rotation speed control device 8 that individually drives and controls the rotation speeds of a plurality of heater fans mounted in the rear heater unit 3 and the front heater unit 2, respectively. And a heater control switch 7 that activates the fan rotation speed control device 8.

The first water cock 55 and the second water cock 56 prevent the cooling water (hot water that has cooled the engine) from flowing into the cooling water pipe 50 when heating is not used in summer.
The pressurized water pump 53 uses a plurality of rear heater units 3 and a front heater unit 2 (hereinafter, the rear heater unit 3 and the front heater unit 2 are abbreviated as a heater unit 3) for cooling water protruding from an engine arranged in series. In order to improve the heat exchange efficiency of each heater unit 3, the pressure is applied to the cooling water.
The pre-heater unit 6 is used when heating the cooling water when sufficient hot air cannot be ejected from the plurality of heater units 3 at the temperature of the cooling water raised by cooling the engine.

FIG. 3 shows an external perspective view of the heater unit 3 in which the first temperature sensor 11 and the second temperature sensor 12 are arranged.
In the heater unit 3, the first temperature sensor 11 is disposed in the cooling water pipe 50 on the cooling water introduction side where the cooling water is introduced into the heater unit 3, and the first temperature sensor 11 is provided in the cooling water pipe 50 led out from the heater unit 3. A two-temperature sensor 12 is provided.
The values detected by the first temperature sensor 11 and the second temperature sensor 12 are transmitted to the fan rotation speed control device 8.

The fan rotation speed control device 8 includes a temperature difference detection unit 82 and a control unit 81 that controls the rotation of the heater fan 31 based on the detection result of the temperature difference detection unit 82.
The temperature difference detection unit 82 detects a temperature difference based on values (resistance values) transmitted from the first temperature sensor 11 and the second temperature sensor 12.
The controller 81 controls the rotation of the heater fan 31 (see FIG. 2) built in the heater unit 3 in four stages.
The four stages are divided into a first stage for high speed revolution, a second stage for medium speed revolution, a third stage for low speed revolution, and a fourth stage for stopping the heater fan.
In the present embodiment, the number of stages is four, but the number of stages may be increased or decreased depending on the situation.

Based on FIG. 4, the control method of the fan rotation speed control device 8 will be described.
In step S1, the heater control switch (S / W) is turned on to start.
In step S <b> 2, the first temperature sensor 11 detects the coolant temperature T <b> 1 introduced into the heater unit 3.
In step S <b> 3, the coolant temperature T <b> 2 derived from the heater unit 3 is detected by the second temperature sensor 12.
The temperature difference between the first temperature sensor 11 and the second temperature sensor 12 is that the amount of heat exchanged between the vehicle interior air and the cooling water by the heat exchanger built in the heater unit 3 is released into the vehicle interior. It will be.

In step S4, the fan rotation speed control device 8
Cooling water temperature T1−cooling water temperature T2 = 30 to 39 ° C.
It is judged whether it is in the range.
In general, the cooling water temperature of the internal combustion engine is ideally about 80 ° C. Therefore, when the difference between T1 and T2 is 30 to 39 ° C., the cabin temperature is relatively high, and the replacement efficiency in the heater unit 3 is high. It is low.
In this state, the fan rotation speed control device 8 performs control to increase the rotation speed of the heater fan 31 and increase the amount of heat blown into the passenger compartment.
Accordingly, in step S4, the fan rotation speed control device 8 selects YES, proceeds to step S8, and controls the rotation speed of the heater fan 31 to rotate in the first stage (high speed rotation speed).
The fan speed controller 8 performs the speed control of the heater fan 31 in step S8, and then proceeds to step S12 and returns.
In the route bus 10 of FIG. 1, the front door 10 a and the middle door 10 b are frequently opened and closed, so that the temperature in the passenger compartment varies depending on the location of the heater unit 3.
Therefore, as shown in FIG. 2, each heater unit 3 includes a first temperature sensor 11 and a second temperature sensor, and is separately controlled by the fan rotation speed control device 8.
If NO is selected in step S4, the process proceeds to step S5.

In step S5, the fan rotation speed control device 8
Cooling water temperature T1−cooling water temperature T2 = 40 to 49 ° C.
It is judged whether it is in the range.
When the difference between T1 and T2 is 40 to 49 ° C., the vehicle interior temperature is in the normal range, and the heat exchange between the vehicle interior air and the cooling water in the heater unit 3 is in the normal state.
In this case, the fan rotation speed control device 8 selects YES, proceeds to step S9, and controls the rotation speed of the heater fan 31 to rotate in the second stage (medium speed rotation speed).
The fan rotational speed control device 8 performs the rotational speed control of the heater fan 31 in step S9, and then proceeds to step S12 and returns.
If NO is selected in step S5, the process proceeds to step S6.

In step S6, the fan speed controller 8
Cooling water temperature T1−Cooling water temperature T2 = 50 to 59 ° C.
It is judged whether it is in the range.
A difference between T1 and T2 of 50 to 59 ° C. indicates that the passenger compartment temperature is lower than the normal temperature range, and the heat exchange efficiency in the heater unit 3 is efficiently exchanged.
This state indicates that high-temperature wind is blowing out.
As described above, in the route bus, the front door 10a and the middle door 10b are frequently opened and closed, but even in the winter, high warm air is blown out, so that the room temperature is kept moderate.
Further, since the high warm air of the heater unit 3 directly hits the passenger and prevents discomfort, the fan rotation speed control device 8 selects YES, proceeds to step S10, and sets the rotation speed of the heater fan 31 to the fourth speed. Control to rotate at the stage (low speed).
In step S10, the fan rotation speed control device 8 performs the rotation speed control of the heater fan 31, and then proceeds to step S12 and returns.
If NO is selected in step S6, the process proceeds to step S7.

In step S7, the fan rotation speed control device 8
Cooling water temperature T1−Cooling water temperature T2> 60 ° C.
It is judged whether it is in the range.
When the difference between T1 and T2 is 60 ° C. or more, the possibility of low-temperature burns increases when high warm air hits the passenger for a long time. Proceeding to S11, control is performed to stop the rotation speed of the heater fan 31 which is the fourth stage.
In step S11, the fan rotation speed control device 8 performs rotation stop control of the heater fan 31, and then proceeds to step S12 and returns.
If NO is selected in step S7, the process proceeds to step S12 and returns.

Thus, when the detected temperature difference is large, by reducing the fan rotation speed, high warm air is prevented from directly hitting a person for a long time to obtain comfort in the passenger compartment and low temperature burns. Can be prevented.
In addition, passengers who are away from the driver's seat can resolve the dissatisfaction that can not be freely adjusted even if the feet are hot, eliminate the complaints to the driver, and the driver concentrates on the vehicle operation operation Can contribute to the improvement of safety.
Further, in winter, the heater fan 31 tends to be constantly operated to increase the temperature in the passenger compartment, the electric load increases, the load on the alternator and the battery increases, and the alternator is maintained in a stable state. Although the engine load due to the power generation increases, the engine load can be reduced and fuel consumption can be improved by controlling the rotation of each heater fan 31 in detail.

  The present invention can be applied to a vehicle heating device, in particular, hot air blowing amount control during heating of a route bus.

1 Heating device 2 Front heater unit (heater unit)
3 Rear heater unit (heater unit)
6 Preheater Unit 7 Heater Control Switch 8 Fan Rotation Speed Control Device 9 Accelerator Pedal 10 Route Bus 11 First Temperature Sensor 12 Second Temperature Sensor 31 Heater Fan 81 Control Unit 82 Temperature Detection Unit

Claims (1)

A vehicle heating device that heats a vehicle interior using cooling water of an internal combustion engine,
A heater unit having a heater fan that is disposed in the vehicle interior and discharges warm air heat-exchanged with the cooling water into the vehicle interior by a built-in heat exchanger;
A first temperature sensor for detecting a temperature of the cooling water introduced into the heater unit;
A second temperature sensor for detecting a temperature of the cooling water derived from the heater unit;
A fan rotation speed control device that changes the rotation speed of the fan based on a detected temperature difference between the first temperature sensor and the second temperature sensor;
The vehicle heating device according to claim 1, wherein the fan rotation speed control device decreases the fan rotation speed when the detected temperature difference increases.

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