JPH0773976B2 - Vehicle heating system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle heating device for rapidly heating the interior of an automobile driven by an internal combustion engine.

(Prior Art) Conventionally, indoor heating of an automobile is performed by extracting cooling water of an internal combustion engine through a hot water pipe, passing the cooling water through a heater body composed of a heater core and a blower, and sending air to the heater body to heat the room. For heating the room or for heating the room indoors by the amount of heat generated by burning fuel in a separate burner irrespective of the internal combustion engine and guiding the combustion gas itself to the intake manifold of the engine (Japanese Patent Application No.
No. 59-106869) is used.

(Problems of the prior art) In such a method of utilizing the cooling water of the internal combustion engine for indoor heating, since the temperature rising rate of the cooling water is slow, it takes time for the heater body to send out warm air. However, the heating function of the heater is lost during that time. In particular, it takes 10 minutes or more for a gasoline engine and 20 minutes or more for a diesel engine to complete the heating function of the internal combustion engine. During this time,
In cold regions, the interior of the vehicle is cold and it is necessary to wear protective gear, and the defroster that removes frost, ice and the like from the windows of the vehicle cannot operate sufficiently. Also, when the vehicle is traveling on a long downhill, the cold leg water temperature drops and it cannot be supplied for heating. In particular, since the diesel engine is a compression ignition type engine, it is sensitive to the exhaust gas temperature or the cooling water temperature with respect to the load of the engine, and the above-mentioned drawbacks are remarkable. Diesel engines are also sensitive to combustion in cold weather, and the generation of white smoke and odor, which is the result of incomplete combustion, is remarkable.

Also, among the latter heating methods that use fuel separately from the internal combustion engine, the proposal in Japanese Patent Application No. 59-106869 mentioned above can obtain warm air for heating at an early stage. There is a problem in the control as an auxiliary means and the control method of the warm air for heating.

(Object of the Invention) The object of the present invention is to solve the above-mentioned drawbacks of the related art and to easily start the engine even when the engine is cooling during cold weather. In order to provide a heating device for a vehicle, which can provide the interior heating according to the above.

(Outline of the Invention) In the present invention, a burner arranged in the intake pipe, a heat exchanger arranged downstream of the burner for collecting heat generated in the burner, and a heat collected by the heat exchanger. And a control device for monitoring the cooling water temperature of the engine to control the burner and the mechanism,
A vehicle characterized in that the control device operates the burner and does not guide the heat recovered by the heat exchanger into the vehicle interior by the mechanism when the temperature of the cooling water of the engine is below a predetermined temperature. Heating system is provided.

(Embodiment) FIG. 1 is a block diagram of an embodiment of a vehicle heating device according to the present invention. In the figure, 1 is a diesel engine or a gasoline engine, and a rapid heating burner 4 for burning fuel for heating is provided in the middle of a pipe portion of an intake pipe 3 which is an air duct from an air cleaner 2, and a downstream thereof is provided. A heat exchanger 5 is provided. Reference numeral 51 is a bypass passage for supplying combustion air to the engine 1.

Inside the rapid heating burner 4, a vaporizer 6 that heats and vaporizes the fuel, a bypass valve 7 that controls the intake of air that mixes with the vaporized fuel to form a flammable mixture, and the flammable mixture An ignition glow plug 8 for igniting and burning is provided. The vaporizer 6 is provided with a pipe-shaped vaporization glow plug 61 made of a ceramic material that heats and vaporizes fuel, and a resistance wire 62 having a positive temperature coefficient is embedded in the central portion of the vaporization glow plug 61. The vaporization glow plug 61 is heated by energizing the resistance wire 62. The ignition glow plug 8 is also made of a ceramic pipe, and a resistance wire 81 is embedded in the center of the ignition glow plug 8.
The ignition glow plug 8 is heated by energizing 81.

Further, one end of the vaporizer 6 is provided with an injection hole 63 for ejecting the fuel heated and vaporized by the vaporization glow plug 61 into the rapid heating burner 4, and the other end thereof is provided with a fuel valve having a fuel valve. A fuel intake 64 communicating with the supply device 9 is provided. The bypass valve 7 for controlling the intake of the air mixed with the vaporized fuel is controlled by a command of the main control unit 191 described later. When the bypass valve 7 is fully opened, the air for the air-fuel mixture is not taken in and the rapid heating is performed. When the burner 4 is bypassed and the opening of the bypass valve 7 is 1, a predetermined small amount of air is taken in and the opening 2
In this case, the air amount is set to a predetermined medium amount, and in the case of the opening amount 3, the air amount is set to a predetermined large amount, and the opening amount is set to 1 when the main control unit 191 has not issued a command.

The fuel supply device 9 for supplying the fuel from the fuel pump 10 to the vaporization device 6 is provided with a fuel valve A91 and a fuel valve B92 for opening and closing two fuel passages of a fuel passage A91a and a fuel passage B92a, respectively. Further, the fuel valve A91 and the fuel valve B92 are each operable by a drive source 93. The fuel flow rate of the fuel passage B92a is higher than that of the fuel passage A91a, and it is possible to open both fuel passages to increase the fuel flow rate.

Here, the operation related to the rapid heating burner 4 will be described. The fuel sent to the vaporization device 6 from the fuel passage A91a or the fuel passage B92a passes through the vaporization device 6 to be vaporized in the vaporization glow plug 61. It is heated and becomes vaporized fuel from the ejection holes 63 and is ejected into the rapid heating burner 4. Then, the air passing through the bypass valve 7 from the air cleaner 2 and the vaporized fuel are mixed to form a combustible aiki, and the rapid heating burner 4
It is ignited by the ignition glow plug 8 provided in the above to generate a flame, and becomes high temperature combustion gas and is sent to the heat exchanger 5.

The heat exchanger 5 takes in new air from an intake air intake 11 communicating with the interior of an automobile that requires heating, and blows out hot air after the new air takes heat from the combustion gas and exchanges heat.
It is equipped with a blower 13 that blows up to. The outlet 12
Is open at the outlet of the cooling water heater core 14 that is separately installed for indoor heating, and the warm air temperature sensor 15 for blowing air is emitted.
Is provided in the opening. Further, the blower 16, the air conditioner evaporator 17, and the hot water passage 18 shown in the figure are each member of a heating device using cooling water.

Reference numeral 19 denotes a controller, which generates the power generation signal GT from the generator 20 driven by the engine 1 and the operation switch 21.
An ON / OFF signal FS, a water temperature signal WS from the water temperature switch 22 that detects the cooling water temperature of the engine 1, a start position signal ST, and a rotation signal SM from a rotation switch 23a that detects the rotation of the starter motor 23, Accelerator opening signal AS
A load signal EL from an engine load sensor 24 that detects the load state of the engine 1, a warm air temperature signal WA from a warm air temperature sensor 15 provided at the air outlet 12, and a heating position switch operated by the driver. The main controller 191 to which the heating signal WP from 25 and the plug temperature signal PS from the spark plug sensor 26 that detects the temperature of the spark glow plug 8 are input, and the vaporization glow plug 61 of the vaporization device 6 vaporizes the fuel. A bridge circuit 192 for controlling the temperature, a bridge circuit for controlling the ignition glow plug 8 to the ignition temperature of a mixture of vaporized fuel and air
193 and a switch unit 194.

The main control unit 191 has a computer configuration having a processing device, a memory, and an input / output interface.

The bridge circuit 192 includes three resistors that form the other side of the Wheatstone bridge with the resistance wire 62 that heats the vaporization glow plug 61 as one side, a comparator that detects the balance state of the Wheatstone bridge, and the comparator. The relay is operated by the output of the above, and when the relay turns on / off the power supply to the resistance wire 62, the vaporization glow plug 61 is configured to have the vaporization temperature of the fuel, for example, around 500 ° C. Further, the bridge circuit 193 includes three resistors that configure the resistance wire 81 for heating the ignition glow plug 8 as one side and the other side of the Wheatstone bridge, a comparator for detecting the balance state of the Wheatstone bridge, It is composed of a relay operated by the output of the comparator, and is configured so that the ignition glow plug 8 becomes the ignition temperature of the mixture of vaporized fuel and air by turning ON / OFF the energization of the resistance wire 81. .

The switch unit 194 is a switch 19 that controls ON / OFF of the blower 13.
4a, switch 194 for controlling power supply to bridge circuit 192
b, a switch 194 for controlling the power supply to the bridge circuit 193
c, a switch 194 for controlling the power supply to the preheat completion lamp 27
have d. 28 is a power battery, and 29 is a key switch.

FIG. 2 is a flow chart showing an example of processing of the control device for the rapid heating burner according to the present invention, and the processing will be described with reference to FIGS. 1 and 2.

When the key switch 29 is turned on, power is supplied to the main control unit 191 of the controller 19 and other accessory circuits.
The water temperature signal WS from the water temperature switch 22 is sent to the main controller 191.
It is judged whether the cooling water temperature has reached 10 ° C (step a). If the cooling water temperature is 10 ° C. or less, the rapid heating burner is used as the engine start assist device, so the main control unit 191 turns on the switch 194c to energize the ignition glow plug 8 via the bridge circuit 193. Switchgear 1
94a is turned off, the blower 13 is turned off, the drive source 93 of the fuel supply device 9 is instructed to operate the fuel valve A91 to supply the fuel to the vaporization device 6, and the switch 194b is turned on to turn on the bridge circuit 192. The vaporization glow plug 61 is energized via the. Then, the start position signal ST from the key switch 29
Check (step b), if the key switch 29 is in the start position, continue the above operation and
If is in the ON position and is not in the start position, switch 194d is turned on for several seconds to turn on preheating completion lamp 27,
Display the completion of preheating to the driver. Also switch 194b
And 194c are turned off, and the power supply to the vaporization glow plug 61 and the ignition glow plug 8 is stopped.

When the key switch 29 is in the start position and the starter motor 23 is energized and the starter motor 23 is rotating, the rotation signal SM generated by the rotation switch 23a is transmitted to the main controller 191.
Then, the main control unit 191 checks the temperature of the ignition glow plug 8 (step c). That is, the temperature of the ignition glow plug 8 is maintained at a predetermined temperature when energized by the bridge circuit 193, for example, around 800 ° C., but if the combustion of the fuel is sufficiently performed inside the rapid heating burner 4. Since the temperature is higher than the predetermined temperature, the temperature can be detected by checking the resistance value of the resistance wire 81 having a positive temperature coefficient. Therefore, the plug temperature signal PS from the spark plug sensor 26 having the function of detecting the temperature is the main control unit.
When the temperature of the ignition glow plug 8 is 800 ° C. or higher, the fuel is judged to be sufficiently supplied, and the ignition glow plug 8 and the vaporization glow plug 61 are energized by a switch.
Block with 194c and 194b. Then, the temperature check of the ignition glow plug 8 (step c) is repeated after a predetermined time t, and when the temperature is lower than 800 ° C., the flow returns to the flow of energizing the ignition glow plug 8 and the vaporization glow plug 61 to burn the fuel. Sends hot air to the engine 1 to assist in starting.

Next, it is determined whether or not the engine 1 is in self-driving by the input of the power generation signal GT from the generator 20 (step d). If the engine is not in self-driving, the fuel valve B92 having a large fuel flow rate is opened, and The bypass valve 7 is set to the opening degree 2 to increase the amount of air to increase the combustion of fuel and increase the amount of hot air to accelerate the start of the engine 1. When the engine 1 is self-driving, the heating signal WP from the heating position switch 25
Check the position (step e), and if it is ON, check the load signal EL from the load sensor 24 to check the load of the engine 1 further (step f). If the water temperature signal WS from the water temperature switch 22 is 80 ° C. or less, the blower 13 is energized via the switch 194a, and the hot air having undergone heat exchange with the heat exchanger 5 is discharged from the outlet 12. Blow out and start heating (step g). Then, in steps e, f, and g, when the heating signal WP is OFF, or the engine load is large,
If it is / 2 or more, or if the cooling water temperature is 80 ° C or more, the fuel valve A91 and fuel valve B are stopped because the operation of the rapid heating burner 4 is stopped.
92 is closed together, bypass valve 7 is fully opened to bypass air, and vaporization glow plug 61 and ignition glow plug 8
Turn off the power supply. When the cooling water temperature is 80 ° C. or higher, the conventional cooling water heater system can be used, so that the blower 16 is energized to use the conventional heating device.

Also, after the heating of the warm air from the heat exchanger 5 is started in step g, the heating signal WP from the heating position switch 25
In the case of the 2nd position (step h), in order to increase the combustion amount of fuel, the fuel valve A91 is closed and the fuel valve B92 having a large flow rate is opened, the bypass valve 7 is set to the opening 2, and the combustion air is also increased. Increase the amount. The heating signal WP is 3r
In the case of the d position, in order to further increase the combustion amount, both the fuel valve A91 and the fuel valve B92 are opened, the bypass valve 7 is opened to maximize the combustion of the fuel, and a large amount of heat is obtained. .

Next, the warm air temperature signal WA from the warm air temperature sensor 15 that detects the temperature of the warm air at the outlet 12 obtained in the above flow is
If the temperature is 60 ° C or higher (step i or j), the fuel valve A91 and the fuel valve B92 are closed, the bypass valve 7 is fully opened, and the vaporization glow plug 61 and ignition are stopped because the operation of the rapid heating burner 4 is stopped. The glow plug 8 is turned off. Then, after a lapse of a predetermined time, the process proceeds to point D where the heating signal WP is detected. Further, in step i or j, if the warm air temperature signal WA is 60 ° C. or less, the combustion is continued, and after a predetermined time elapses, the temperature of the ignition glow plug 8 is checked again in the rapid heating burner. The fuel condition is checked and the process proceeds to each flow.

When the water temperature signal WS is 10 ° C. or higher in step a, the heating signal WP is checked, and when the heating signal WP is in the heating position (step k), the water temperature signal WS is checked (step k). l) If the cooling water temperature is 80 ° C. or less, the process proceeds to the same flow as YES in step a to enter the process of operating the rapid heating burner 4. If the heating signal WP is not in the heating position in step k, or if the water temperature signal WS is judged to be 80 ° C. or more in the cooling water temperature in step l, the rapid heating burner 4 does not need to be operated. Then, the operation for stopping the combustion of the rapid heating burner is performed.

When the key switch 29 is turned off and the operation of the engine 1 is stopped, the flow returns to START.

Although the present invention has been described with reference to the above embodiment, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

(Effect of the Invention) As described in detail above, according to the present invention, the temperature of the cooling water is checked at the time of starting the engine, and if the temperature is 10 ° C. or less, the rapid heating burner is burned to determine the amount of heat in the vehicle. Since it is not used for heating but is sent to the engine as an engine start assist, the engine can be easily started even in cold weather.

According to the present invention, when the cooling water temperature is 80 ° C. or lower and the cooling water heater cannot be used, the rapid heating heater is activated and the warm air is blown by the blower. Even if the cooling water temperature drops, it is possible to heat the inside of the vehicle.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a vehicle heating device according to the present invention, and FIG. 2 is a flow chart showing an example of the processing. 1: Engine, 3: Intake pipe (air duct) 4: Rapid heating burner, 5: Heat exchanger 8: Ignition glow plug, 13: Blower

Claims (1)

[Claims] 1. A burner disposed in an intake pipe, a heat exchanger disposed downstream of the burner for recovering heat generated in the burner, and heat selectively recovered by the heat exchanger. A mechanism for guiding the vehicle to the passenger compartment, and a control device for monitoring the cooling water temperature of the engine to control the burner and the mechanism,
A vehicle characterized in that the control device operates the burner and does not guide the heat recovered by the heat exchanger into the vehicle interior by the mechanism when the temperature of the cooling water of the engine is below a predetermined temperature. Heating system.