JPH0415524Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a heating device for a vehicle that includes a heater core and a combustion type heater.

(Prior Art and its Problems) Conventionally, there has been a heater core that heats a vehicle interior with the heat of cooling water that cools an internal combustion engine for driving a vehicle, and a heater core that heats the interior of a vehicle interior using the heat of cooling water that cools an internal combustion engine for driving a vehicle. A vehicle heater comprising: a combustion type heater that is activated and combusts when the temperature of the cooling water is below a predetermined value to heat the interior of a vehicle with the heat of combustion, in order to compensate for the lack of heat quantity of water; A device is used (for example, Japanese Patent Laid-Open No. 60-78817).

However, in this type of conventional vehicle heating system, the temperature of the heated air blown out by the heater core is adjusted by using a control lever to adjust the opening degree of an air mix door located upstream of the heater core (for example, On the other hand, the temperature of the heating air blown out by a combustion heater is generally adjusted by changing the amount of fuel and combustion air in stages using a switch such as a push button. It is true.

Therefore, heating with a heater core and heating with a combustion type heater use different parts for adjusting the outlet temperature, so the operating methods and operating sensations are different, and as a result, the overall operation for accurately adjusting the outlet temperature becomes complicated. However, there were problems in that it was difficult for the driver to understand how to operate the system, and it was not easy to operate it. That is, since the adjustment members are different as described above, the set blowout temperature characteristics of the heating air by the heater core and the set blowout temperature characteristics of the heating air by the combustion type heater are different depending on the adjustment position of the adjustment member.
As a result, when the operation of the combustion type heater is stopped and only the heater core is operated, the blowout temperature changes greatly, giving the driver an inconvenient feeling of discomfort in terms of body temperature. On the other hand, when adjusting the heating outlet temperature by a combustion type heater using a relatively simple operation such as ON/OFF switching, the heating outlet temperature cannot be adjusted with high precision.

(Purpose of the invention) The present invention was made to solve the above-mentioned problems, and improves the operability of the adjustment member that adjusts the heating outlet temperature in a vehicle heating system equipped with a heater core and a combustion type heater. It is an object of the present invention to provide a heating device for a vehicle that can improve the temperature and adjust the blowing temperature with high precision.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a heater core that heats the interior of the vehicle with the heat of the cooling water that cools the internal combustion engine for driving the vehicle, and a In a vehicle heating system comprising a combustion type heater that operates when the temperature is lower than a predetermined value and heats a vehicle interior with the heat of combustion, the opening degree of the air mix damper is set when the heater core is activated. and an adjusting member that adjusts the temperature of heating air blown out by the heater core, and a combustion type that is linked to the adjusting member so that when the combustion type heater is operated, the blowing temperature becomes a blowing temperature corresponding to the position of the adjusting member. and a control means for controlling the heater, the control means controlling the temperature of the air outlet temperature controlled by the combustion heater when the temperature of the cooling water is below the predetermined value, and controlling the temperature of the heater core corresponding to the position of the adjustment member. The characteristic is that the temperature is set to be substantially the same as the blowout temperature characteristic.

(Function) The adjustment member sets the opening degree of the air mix damper when the heater core is activated, and adjusts the temperature of the heating air blown out by the heater core. The control means controls the combustion type heater in conjunction with the adjustment member so that the blowout temperature corresponds to the position of the adjustment member when the combustion type heater is activated. Therefore, since only a single adjustment member is required, the operability is improved, and the operability for adjusting the heating outlet temperature when the combustion type heater is activated is improved, while the operability for adjusting the heating outlet temperature when the heater core is activated is The blowing temperature can be adjusted easily and accurately because it can be performed with the same feeling as an operation. Further, the control means sets the blowout temperature controlled by the combustion heater when the temperature of the cooling water is below a predetermined value so that it is substantially the same as the blowout temperature characteristic by the heater core corresponding to the position of the adjustment member. When the cooling water temperature exceeds a predetermined value and switching from heating by the combustion heater to heating by the heater core, the blowout temperature of the heating air is almost the same before and after switching to heating, so the combustion heater is activated only when necessary. This makes it possible to improve the heating efficiency, and at the same time, the driver does not experience any discomfort due to the perceived temperature during the switching.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of a vehicle heating system according to the present invention. It is composed of.

A blower 7 for the air conditioner 1 is provided in the upstream portion of the duct 6 of the air conditioner 1, and the blower 7 is driven by a motor 8 to supply air from an air inlet 9 on the upstream side. A ₂ is introduced into the duct 6. The introduced air _A2 passes through an evaporator 10 on the downstream side. The evaporator 1
Air mix damper 11 provided on the downstream side of 0
The opening degree of the control panel 3 is adjusted in conjunction with a temperature adjustment lever 37, which will be described later, of the control panel 3.
The air passing through the evaporator 10 is distributed at a predetermined ratio to the side passage 6a side at the upper side in the figure and the heater core 12 side at the lower side. A part of the cooling water flowing inside the engine 5 is introduced into the heater core 12 from a cooling water inlet 12a through a pipe (not shown), and after flowing through the heater core 12, a part of the cooling water flowing through the engine 5 is introduced into the cooling water outlet 12a. 12b and returns to the engine 5 via a pipe (not shown), and the air passing through the heater core 12 is heated by heat exchange with the cooling water flowing through the heater core 12. be done. The heated air flows through the side passage 6
After the air that has passed through a is mixed with the air on the downstream side of the heater core 12 to obtain air of a uniform temperature, the dampers 13 and 14 are switched to open and close the face outlet 15, the foot outlet 16, or the defroster outlet. 17 to a predetermined position in the vehicle interior.

The combustion type heating device 2 includes a hot air type combustion type heater 1 that directly heats heating air A ₂ using combustion gas heat.
8 and a blower 20 that is driven by a motor 19 and supplies the heating air A ₂ to the combustion heater 18 . The combustion type heater 18 includes a combustor 22 that causes combustion by ignition by an ignition plug 21 to which liquid fuel F and combustion air A ₁ are supplied, and a combustion gas G and the heating air A in the combustor 22 . ₂ and a heat exchanger 23 for exchanging heat between the two. The liquid fuel F is supplied to the combustor 22 by a fuel supply pipe 26 that connects the combustion chamber of the combustor 22 and the fuel tank 24 and has a fuel pump 25. is operated by the motor 27, an amount of liquid fuel F corresponding to the rotation speed is supplied to the fuel tank 24.
It is sucked up from the air and supplied into the combustion chamber.
Further, the combustion air _A1 is supplied to the combustor 22 through an air supply pipe 28 having a blower (not shown). When the blower is driven, air _A1 is supplied into the combustion chamber in an amount corresponding to the rotation speed of the blower. In this manner, combustion occurs when ignition is performed by the ignition plug 21 while the liquid fuel F and combustion air _A1 are supplied into the combustion chamber. The combustion gas G resulting from the combustion flows into the inner cylinder 29 of the heat exchanger 23 and is discharged from the exhaust pipe 30 to the outside of the combustion heater 18.
9, heat is generated between the heating air _A2 flowing through the passage 32 between the inner cylinder 29 and the outer cylinder 31, which is supplied by the blower 20 driven by the motor 19. be exchanged. Thereby, the heating air A ₂ is warmed and supplied into the vehicle interior from the outlet 33a of the duct 33.

FIG. 2 is a diagram showing details of the main parts of the control panel 3. As shown in FIG. The control panel 3 is provided in the vehicle interior as a part of an instrument panel (not shown), and includes a switch lever 34, a start switch 35, an indicator lamp 36, a temperature adjustment lever (adjustment member) 37, and first and second indicators 38. , 39.

The switch lever 34 is connected to the air conditioner 1.
The start switch 35 switches on/off the operation of the motor 8 of the combustion heating device 2.
Switches the operation of the motor 19 on/off. The indicator lamp 36 lights up when the blower 20 of the combustion type heating device 2 is operated by the operation of the motor 19, that is, when the combustion type heating device 2 is operating, to indicate this.

The temperature control lever 37 is connected to the air conditioner 1.
In either case of heating by the heating system or heating by the combustion heating device 2, the blowing temperature T _A of the heating air is set. In the former case, the first indicator 38 is set on the indication panel. and in the latter case, use the second indicator 39 as an indication panel to operate the temperature control lever 37 within the range from the N point to the FULL HOT point. The blowout temperature T _A is set by . In addition,
The N point of the second indicator 39 matches the midpoint of the first indicator 38, and the FULL HOT point of the second indicator 39 matches the HOT point of the first indicator 38.

FIG. 3 is a diagram showing details of the control unit 4, and the control unit 4 is turned on when the ignition switch 40 is turned on (on state).
When power is supplied from a power source (battery) 41, it enters a driving state.

Input side terminal 4a of the control unit 4
- 4e include a discharge air temperature sensor 42 installed near the outlet 33a in the duct 33, a water temperature sensor 43 installed in the water jacket of the engine 5, and an operation of the combustion heating device 2. A temperature setting device 44, which is a variable resistor that is linked to the temperature control lever 37 and sets a voltage according to the position of the temperature control lever 37, the start switch 35, and the blower 20 to turn it on/off. off
The switch 46 is electrically connected to the switch 46 via harnesses 47 to 51, respectively. Further, output side terminals 4f to 4 of the control unit 4
h, the ignition plug 21, the motor 19 of the blower 20 of the combustion heating device 2, and the motor 8 of the blower 7 of the air conditioner 1 are connected via relay switches 52 to 54 and harnesses 55 to 57, respectively. The motor 27 of the fuel pump 25 is electrically connected to the output terminal 4i via a harness 58, and the combustion air is connected to the output terminal (not shown).
Blower motors (not shown) for supplying _A1 are electrically connected to each other.

Therefore, the control unit 4 receives the heating air blown into the vehicle interior from the outlet 33a of the duct 33 by the blown air sensor 42.
_A signal corresponding to the temperature state of the engine cooling water in the water jacket of the engine 5 is transmitted by the water temperature sensor 43 to the temperature state of the engine cooling water in the water jacket of the engine 5 when the combustion heating device 2 is activated. A voltage signal from the temperature setting device 44, which is set according to the position of the temperature adjustment lever 37, is applied to the start switch 35.
The on/off signal from the switch 46, which is turned on/off in conjunction with the blower 20, is input, respectively.

Based on these input signals, the control unit 4 controls the motor 19 and ignition plug 21 of the blower 20 for supplying the heating air _A2 , the motor 27 of the fuel pump 25, and the blower (not shown) for supplying the combustion air. Control signals are output to the motor and the motor 8 of the blower 7, respectively. That is,
When the start switch 35 is in the on state, the engine 5 is detected by the water temperature sensor 43.
When the cooling water temperature T _W is below a predetermined value (e.g. 80℃),
and the temperature control lever 37 is from the N point.
If it is on the FULL HOTO point side, the control unit 4 detects this based on the input signal and controls the ignition plug 21 and the fuel pump 25.
motor 27, a blower motor (not shown) for supplying the combustion air _A1 , and the heating air _A2.
Turn on each motor 19 of the supply blower 20
By outputting a signal, the combustion heating device 2 is brought into operation, and by outputting an off signal to the motor 8 of the blower 7, the air conditioner 1 is brought into a stopped state. On the other hand, the temperature setting device 44 outputs a voltage signal to the control unit 4 according to the position of the temperature control lever 37 between the N point and the FULL HOT point, thereby setting the blowing temperature T _A of the heating air. . The control unit 4 constantly compares the input voltage signal of the set outlet temperature T _A with the input signal of the actual outlet temperature T detected by the outlet air temperature sensor 42, and adjusts the voltage signal according to the difference between the former. For example, as shown in FIG. 5, a control signal is output to the motor 27 of the fuel pump 25 so that the amount of fuel supplied to the combustor 19 becomes a predetermined amount of fuel. That is, the combustor 1
The amount of fuel supplied to 9 is set to a larger predetermined fuel amount (Q ₁ , Q ₂ , Q ₃ or zero) as the difference between the set blowout temperature T _A and the actual blowout temperature T is larger,
As a result, the heating air blowing temperature T is quickly controlled to the set blowing temperature T _A.

On the other hand, if any of the operating conditions of the combustion heating device 2 are not satisfied, that is, the starting switch 35 is in the off state, or the engine 5
whether the cooling water temperature T _W of is higher than the predetermined value;
Or the temperature control lever 37 is lower than the N point.
When the temperature is on the COLD point side and the switch lever 34 is in the on state, the control unit 4 turns the motor 8 of the blower 7 on.
By outputting a signal, the air conditioner 1 is brought into operation, and the ignition plug 21,
The combustion type heating device 2 is brought into a stopped state by outputting an off signal to the motor 27 of the fuel pump 25, the motor of the blower (not shown) for supplying combustion air, and the blower 20 motor 19 for supplying heating air. . Further, the air mix door 11 opens and closes in conjunction with the temperature adjustment lever 37, and the opening degree corresponds to the position of the temperature adjustment lever 37, and the air that has passed through the evaporator 10 is directed to the heater core 12 side and to the heater core 12 side. The blowing temperature _T of the heating air is set by distributing it at a predetermined ratio to the side passage 6a side that does not pass through the side passage 6a.
EAdjust.

FIG. 4 shows the relationship between the position of the temperature control lever 37 and the set blowing temperature T _A of heating air corresponding to that position. The blowout temperature T _A when performing heating by the air conditioner 1 depends on the cooling water temperature T _W of the engine 5, and
is set to increase linearly from the COLD point to the HOT point. That is, when the cooling water temperature T _W of the engine 5 is low, the change characteristic of the set outlet temperature T _A is shown by the broken line in FIG.
The blowout temperature T _A is determined by the temperature control lever 37.
When it is located at a COLD point, it is T _A0 , and when it is located at a HOT point, it is T _A2 '. When the cooling water temperature T _W of the engine 5 is below a predetermined value (for example _{, 80° C. or higher), the change characteristic of the set outlet temperature T A is} shown by the thin solid line in FIG. When the lever 37 is located at the COLD point, the above-mentioned cooling water temperature T _W is the same value as when it is low.
T _A0 , when located at the HOT point, T _A2 is a value larger than the value T _A2 ′ when the cooling water temperature is low.
(for example, 70°C), and T _A1 (for example, 35°C) when located at the N point. Furthermore, when the cooling water temperature _TW is at a temperature intermediate between the low temperature and the predetermined value, the change characteristic of the blowout temperature _TA is as follows.
The T A0 when the temperature control lever 37 is at the COLD point and the T _A0 when the temperature control lever 37 is at the HOT point.
It is set as a straight line connecting T _A2 ′ and a temperature corresponding to the cooling water temperature T _W that is intermediate to T A2 ′ (not shown).

On the other hand, in the combustion type heating device 2, as described above, the temperature control lever 37 is connected to the indicator 39.
The range indicated by, i.e. from point N
When the start switch 35 is located in the range between the FULLHOT points and other conditions are met, i.e. the start switch 35 is
Since it is in the on state and is configured to operate only when the cooling water temperature T _W is below the predetermined value, the adjustment movement range of the temperature adjustment lever 37 when performing heating by the combustion heating device 2 is between the N point and the FULL HOT point. At this time, the relationship between the position of the temperature control lever 37 and its corresponding blowout temperature T _A is as shown by the thick solid line in FIG. , a change characteristic of the heating outlet temperature by the air conditioner 1 when the cooling water temperature T _W of the engine 5 is above the predetermined value and the temperature control lever 37 is located between the N point and the HOT point. are set to be almost the same. Therefore, the combustion type heating device 2
The set blowout temperature T _A when heating is set to T A1 (e.g., 35°C) when the temperature control lever ₃₇ is located at the N point, and to T _A2 (e.g., 70°C) when it is located at the HOT point. They are almost equal.

Next, the operation of the axle heating device of the present invention having the above structure will be explained.

First, when the engine 5 is operated, the ignition switch 40 is turned on, power is supplied from the power source 41, and the control unit 4 is put into the driving state.

The switch lever 34 and the start switch 35
The temperature control lever 37 is set to the on state and the temperature control lever 37 is turned to the N position.
If it is set closer to the COLD point than the
Regardless of the cooling water temperature T _W of the engine 5, the motor 8 of the blower 7 is operated under the control of the control unit 4, and the air conditioner 1 is put into operation. The blower motor (not shown) of the supply pipe 28 and the motor 19 of the blower 20 are stopped, and the combustion type heating device 2 is brought into a stopped state. Therefore, the blowing temperature T _A of the heating air in this state is set according to the cooling water temperature T _W of the engine 5, as shown in the range from the COLD point to the N point in FIG. When the water temperature T _W is low, the cooling water temperature T _W changes to the temperature shown by the broken line in the figure.
When is above a predetermined value, the temperature is set to the temperature shown by the thin solid line in the figure, and heating air at a temperature approximately equal to the set blowout temperature T _A is promptly supplied into the passenger compartment under the control of the control unit 4.

In the above state, when the temperature inside the vehicle is lower than the desired temperature and the driver wants to quickly raise the temperature inside the vehicle, the temperature control lever 37 is moved from the N point.
It is operated to the HOT point side position.

In this case, that is, the temperature control lever 37 is lower than the N point.
When the engine is located on the HOT point side and the switch lever 34 and the start switch 35 are in the on state, and the coolant temperature T _W of the engine 5 has not yet risen and is below the predetermined value, the control unit 4
Under this control, the motor 8 of the blower 7 is stopped, and the air conditioner 1 is brought to a stopped state, and the ignition plug 21, the motor 27 of the fuel pump 25, the motor of the blower (not shown) for supplying combustion air, and the motor of the blower 20 are stopped. The motor 19 is activated and the combustion heating device 2 is put into operation. Therefore, the blowing temperature of the heating air in this state is the temperature shown by the thick solid line in FIG. 4, regardless of the engine 5 cooling water temperature _TW , that is, the temperature when the engine 5 cooling water temperature is equal to or higher than the predetermined value. The temperature is set to be almost the same as the set blowout temperature of heating air by the air conditioner 1 (approximately T _A1 at the N point, almost T _A2 at the HULL HOT point), and the set blowout temperature T _A is controlled by the control unit 4. Heated air of approximately the same temperature is quickly supplied into the vehicle interior.

On the other hand, the temperature control lever 37 and the switch lever 3
4 and the start switch 35 are in the same state as above, and when the cooling water temperature T _W rises as the engine 5 operates and exceeds the predetermined value,
Similarly to when the temperature control lever 37 is located closer to the COLD point than the N point, the air conditioner 1 is brought into operation under the control of the control unit 4, and the combustion heating device 2 is brought into a stopped state. . Therefore, the blowout temperature in this state is the temperature shown by the thin solid line in the range from the N point to the HOT point in FIG. 4, that is, the cooling water temperature of the engine 5.
The heating air temperature is set to the blowout temperature when T _W is above the predetermined value (T _A1 at the N point, T _A2 at the HOT point), and the temperature is approximately equal to the set blowout temperature T _A under the control of the control unit 4. is quickly supplied into the vehicle interior.

In addition, when there is no need to raise the temperature inside the vehicle so much, such as during the middle season or warm season, the driver can turn off the start switch 35 to increase the temperature of the cooling water of the engine 5.
T _W , regardless of the position of the temperature control lever 37, the combustion type heating device 2 is always not activated, and only the air conditioner 1 can be operated. In this case, the blowing temperature T _A of the heating air can be set using the temperature control lever 37 in the same manner as in the conventional case.

In this embodiment, heating by the air conditioner 1 and heating by the combustion heating device 2 are configured to be automatically switched when the engine cooling water temperature reaches a predetermined value. It is also possible to provide a device for the driver to display the status, such as a pilot lamp, so that the driver can manually operate the vehicle according to the display.

(Effects of the invention) As detailed above, the present invention provides a heater core that heats the interior of the vehicle with the heat of the cooling water that cools the internal combustion engine that drives the vehicle, and a In a vehicle heating system comprising a combustion type heater that operates to combust and heat a vehicle interior with the heat of combustion, the opening degree of an air mix damper is set when the heater core is activated; an adjustment member that adjusts the blowout temperature of heating air; and a control member that controls the combustion heater in conjunction with the adjustment member so that the blowout temperature corresponds to the position of the adjustment member when the combustion heater is activated. and a control means, wherein when the temperature of the cooling water is below the predetermined value, the blowout temperature characteristic controlled by the combustion type heater is adjusted to the blowout temperature characteristic by the heater core corresponding to the position of the adjustment member. Since the heating outlet temperature is set to be approximately the same as the heating outlet temperature, operability can be improved by requiring a single adjustment member for adjusting the heating outlet temperature, and the heating outlet temperature when the combustion type heater is activated is Since the operation for adjusting the temperature can be performed in the same way as the operation for adjusting the heating blowout temperature when the heater core is activated, the blowout temperature can be easily and accurately adjusted. Additionally, when the temperature of the cooling water exceeds a predetermined value and switching from heating using the combustion heater to heating using the heater core, there is little difference in the blowout temperature of the heating air before and after the switch, making it possible to operate the combustion heater only when necessary. This has the advantage that heating efficiency can be improved and the driver does not feel any discomfort in terms of body temperature during the switching. Furthermore, since heating is not performed by the combustion type heater core, the temperature of the cooling water rises quickly, and heating can be quickly switched from the combustion type heater to the heater core.

Furthermore, since there is only one temperature regulating member, the number of members is reduced compared to the conventional method, so there is an advantage that manufacturing costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of the vehicle heating system of the present invention, Fig. 2 is an enlarged front view of the main parts of the control panel, Fig. 3 is the electric circuit diagram, and Fig. 4
The figure shows the relationship between the position of the temperature control lever (adjustment member) and the change characteristic of the set blowout temperature, and FIG. 5 shows an example of fuel amount control when the combustion type heater is operated. 4...Control unit (control means), 5
... Engine (internal combustion engine), 12 ... Heater core,
18... Combustion type heater, 37... Temperature adjustment lever (adjustment member).

Claims (1)

[Scope of utility model registration request] A heater core that heats the interior of the vehicle with the heat of the cooling water that cools the internal combustion engine that drives the vehicle; A heating device for a vehicle comprising a combustion type heater that performs heating, an adjusting member that sets the opening degree of an air mix damper when the heater core is activated and adjusts the temperature of the heating air blown out by the heater core, and the adjusting member. control means for controlling the combustion type heater so that the blowout temperature corresponds to the position of the adjusting member when the combustion type heater is activated, and the control means controls the cooling water so that the blowout temperature corresponds to the position of the adjusting member. A vehicle characterized in that when the temperature is below the predetermined value, the blowout temperature characteristic controlled by the combustion type heater is set to be substantially the same as the blowout temperature characteristic by the heater core corresponding to the position of the adjustment member. Heating device.