JPH0773973B2 - Car heating system - Google Patents

Description

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

(Prior art) For indoor heating of automobiles, conventionally, cooling water of an internal combustion engine is taken out by a hot water pipe, and this is passed through a heater body composed of a heater core, a blower, etc., and air is sent to the heater body to heat it. Indoor heating is widely used. On the other hand, the one that burns fuel with a burner and heats it with combustion heat regardless of the internal combustion engine is actually used.
Proposed in 059 and Japanese Utility Model Laid-Open No. 57-15958.

(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 speed of the cooling water is slow, it takes a long time for the heater body to send out warm air. . Further, in the case of burning fuel with a burner, the combustion is performed independently when the engine is started, regardless of the operating state of the internal combustion engine, so it takes time to process the exhaust gas, and there is a problem in terms of environmental pollution. is there. In particular, as in the technique of Japanese Utility Model Laid-Open No. 55-180059, the fuel is impregnated into the porous material in the intake pipe,
If the fuel is vaporized and burned, unstable combustion continues even after the fuel is cut, and a large amount of unburned gas is sucked into the engine, causing smoke and a large amount of toxic gas to be emitted. It takes time and the start of heating is delayed.

An object of the present invention is to solve the above-mentioned problems with the conventional heating device, and control the fuel supply and combustion timing for the burner to an optimum value according to the engine operating condition and the heating condition to minimize the problem of environmental pollution. An object of the present invention is to provide an automobile heating system capable of rapidly heating the interior of the vehicle while suppressing the heating.

(Means for Solving Problems) The present invention has a burner device in the middle of an intake pipe connected to an engine, a fuel control valve in a fuel supply passage to the burner device, and an engine speed. It has a detection means, an engine cooling water temperature sensor, a sensor for detecting the heating air temperature, and an accelerator sensor for detecting the accelerator opening, and when the engine speed is above a set value and the cooling water temperature is below a set value When the air temperature is above the set value, the fuel control valve is controlled in the opening direction to increase the combustion operation of the burner device.When the heating air temperature is below the set value and the accelerator is not stepped on, the engine speed is When the cooling water temperature is equal to or lower than the set value and the accelerator temperature is equal to or higher than the set value or the accelerator pedal is stepped on the set value, a control means for controlling the fuel control valve in the closing direction to reduce the combustion operation of the combustion device of the burner device is provided. Special to have The present invention provides a heating system for an automobile. Will be corrected.

(Operation) In the above means, when the engine speed sensor detects that the engine speed is equal to or higher than the set value and the cooling water temperature is equal to or lower than the set value, these detections are performed. Based on the data, the controller supplies vaporization and ignition currents to the fuel vaporizer and the fuel ignition device, respectively, and at the same time opens the fuel control valve. In this way, fuel supply, vaporization and ignition combustion are performed, and when the heating air temperature detected by the temperature sensor is above the set value, the fuel control valve is closed to decrease the fuel supply, and when it is below the set value, the accelerator sensor On the condition that the accelerator lever position is determined to be equal to or less than the set depression amount by, the fuel control valve is opened in the direction in which the fuel supply increases.

Further, when the engine speed is less than or equal to the set value, when the cooling water temperature is greater than or equal to the set value, or when the accelerator lever position is greater than or equal to the set depression amount, the controller is
Cut off the ignition current and close the fuel control valve. In this way, it is possible to heat the interior of the automobile in a cold region in a short time based on the engine operating state and the heating air temperature.

(Embodiment) FIG. 1 is a block connection diagram showing an embodiment of an automobile heating apparatus according to the present invention. Reference numeral 1 denotes an internal combustion engine such as a diesel engine or a gasoline engine. A burner device 5 and a heat exchanger 6 are provided downstream thereof in the middle of an intake pipe 4 connecting an intake manifold 2 and an air cleaner 3 of the engine. There is. The burner device 5 has a vaporizer 9 for vaporizing the fuel coming from the fuel pump 7 through the fuel control valve 8 and an ignition device 10 for igniting the fuel vaporized by the vaporizer 9.

The heat exchanger 6 takes in outside air from an air intake 11 communicating with the interior of an automobile that requires heating, the outside air removes the heat of combustion to become warm air, and this warm air is supplied to the blowout port 13 by the blower 12.

The air outlet 13 is opened at an outlet of a cooling water heater core 14 which is separately arranged for heating the room. The illustrated blower 15, the air conditioner evaporator 16 and the hot water passage 17 constitute a cooling water heater device.

Reference numeral 18 is a controller, which is a voltage generated by a generator 19 driven by the engine 1, an on / off signal of a blower switch 20,
The water temperature signal of the cooling water temperature sensor 21 for detecting the temperature of the cooling water in the water jacket of the engine, the signal of the position of the accelerator lever 22 detected by the accelerator sensor (potentiometer) 23, and the output signal of the temperature sensor 29 of the heating air are input, respectively. To do. Then, the controller 18 controls the fuel control valve 8 to an optimum opening degree in accordance with the various signals described above, and provides the vaporization device 9 and the ignition device 10 with control signals for performing vaporization and ignition of fuel at optimal timings, respectively. At the same time as supplying, the current supply switches 25 and 26 for vaporization and ignition from the battery power source 24 are on / off controlled. The controller 18 also controls a switch 27 that operates the blower 12 at the optimum timing. The drive control of the fuel control valve 8 is performed by a step motor or the like which is the valve drive device 28.

Next, the operation of the above configuration will be described.

First, the engine 1 is started by key-on operation of an ignition switch (not shown). The start of the engine 1 and the engine speed associated with this start are detected by the voltage generated by the generator 19, and this detection signal is input to the controller.

When the controller 18 determines that the manual blower switch (not shown) of the blower 12 is off in the operating state of the engine 1 (step a), the engine speed is based on the output of the generator 19. Below the set value, for example
When it is determined to be 800 rpm or less (step b), the cooling water temperature is equal to or higher than the set value based on the output of the water temperature sensor 21, for example, 80
When it is determined that the temperature is equal to or higher than 0 ° C. (step c), the engine 1 is sufficiently warmed up and the vehicle interior heating by the cooling water temperature is sufficient. Therefore, the fuel control valve 8 is fully closed and the vaporizer 9 and The current supply to the ignition device 10 is cut off (step d).

On the other hand, when it is determined that the blower switch is on in step a, the engine speed is determined to be 800 rpm or higher in step b, and the cooling water temperature is determined to be 80 ° C. or lower in step c, Although the engine 1 is driven by itself, the engine 1 is insufficiently warmed up and the interior heating of the vehicle is insufficient. Therefore, the controller 18 supplies the vaporization heating power to the vaporization device 9 with the battery power. Supply control is performed from 24 (step e), and ignition power is supplied to the ignition device 10 (step f). Further, during this period, the fuel control valve 8 is kept in the valve drive device 28.
Thus, the optimum amount is opened according to the engine speed and the cooling water temperature (step g).

Therefore, by opening the fuel control valve 8, the fuel pump 7
From this, the fuel is fed to the vaporizer 9 at an optimal timing at an optimal amount, and this is heated and vaporized. This vaporized fuel is ignited and burned by the ignition heat source of the ignition device 10 and becomes high temperature combustion gas. This combustion gas heats the outside air taken in from the air intake 11 in the heat exchanger 6, and blows the heated air to the blowout port 13 by the blower 12 to heat the interior of the vehicle.

Thus, after a lapse of a minute time, the temperature sensor 29 detects the temperature of the heating air at the outlet 13, and if this temperature is determined to be the set value or more, for example, 60 ° C. or more (step h), the fuel control is performed. The valve 8 is closed by 5% from the present opening to reduce fuel consumption and maintain the heating air temperature at 60 ° C. (step i). Further, when it is determined that the temperature of the heating air is 60 ° C. or lower in step h, and the position of the accelerator lever 22 is determined to be, for example, 1/2 or less of the total depression amount (step j), the fuel control valve 8 is turned on. Open 5% more than the current opening to increase the amount of fuel supply and maintain an appropriate heating air temperature of 60 ° C (step k).

In this way, the controller 18 controls the fuel supply amount, the magnitude of the current flowing through the vaporizer and the ignition device, and the timing control in order to obtain a predetermined optimum heating air temperature according to the operating condition of the engine 1. To do.

The reason why the load on the engine 1 is detected by the accelerator lever 22 instead of the rack lever of the injection pump is that the fuel is burned upstream of the intake pipe 4, so that the load fluctuation on the engine 1 can be detected quickly. This is to prevent the increase in the concentration of black smoke emitted from the engine by making the fuel in the vaporizer rapid. Therefore, when oxygen is consumed by the above combustion upstream of the intake pipe 4, the air-fuel mixture combustion in the engine 1 deteriorates when the load increases, so the accelerator lever 22 is stepped in by half (almost 1 / of the total engine load). (Corresponding to 2) In the following cases, it is important to perform the operation like step k.

Further, at step j, when the depression amount of the accelerator lever becomes 1/2 or more of the above, the fuel control valve 8 is closed,
The current supply to the vaporizer 9 and the ignition device is stopped.

After the operation of the steps d, i, k is finished, the timer keeps the end state for a certain period of time (step 1), the operation returns to the first start point, and the operation of the step a is entered again.

Thus, the fuel control valve 8, the vaporizer 9 and the ignition device
By optimizing the operation amount and operation timing of 10, heating by fuel combustion heat can be quickly performed prior to heating by cooling water, and unburned gas contained in the combustion gas at this time is burned in the engine. be able to. In this way, environmental deterioration due to exhaust gas can be controlled.

The heating blower 12 can be shared with the blower 15 that constitutes the heater device for the cooling water.

(Effects of the Invention) As described above, the vehicle heating system according to the present invention is provided with the burner device in the middle of the intake pipe of the engine, and the fuel control valve is provided in the fuel supply passage to the combustion vaporizer of the burner device. By providing these burner devices and the fuel control valve to operate optimally according to the operating state of the engine,
The burner unit burns the fuel to recover the heat generated,
This can be used as a heating heat source, and indoor heating can be effectively performed immediately after the engine is started.

Further, since the combustion gas discharged from the burner device is taken into the engine to reburn the unburned gas, the air pollution can be controlled. In other words, if an unburned gas processing means is separately provided, the inconvenience can be eliminated.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an embodiment of an automobile heating apparatus according to the present invention, and FIG. 2 is a flow chart for explaining the heating operation. 1 ... Engine, 2 ... Intake manifold, 3 ... Air cleaner, 4 ... Intake pipe, 5 ... Burner device, 6 ... Heat exchanger, 7 ... Fuel pump, 8 ... Fuel control valve, 9 ... … Vaporizer, 10 …… Ignition device, 11 …… Heating air intake, 12 ……
Blower motor, 13 ... Blowout port, 14 ... Heater core, 18 ...
… Controller, 19 …… Generator, 20 …… Blower switch, 21 …… Cooling water temperature sensor, 23 …… Accelerator sensor.

Claims (1)

[Claims] 1. A burner device is provided in the middle of an intake pipe connected to an engine, a fuel control valve is provided in a fuel supply passage to the burner device, and an engine speed detecting means, an engine cooling water temperature sensor, and heating are provided. It has a sensor that detects the air temperature and an accelerator sensor that detects the accelerator opening, and when the engine speed is above the set value and the cooling water temperature is below the set value and when the heating air temperature is above the set value. Controls the fuel control valve in the opening direction to increase the combustion operation of the burner device, and when the heating air temperature is below the set value and the accelerator is not depressed, the engine speed is below the set value and the cooling water temperature is A vehicle heating system having a control means for controlling the fuel control valve in the closing direction to reduce the combustion operation of the combustion device of the burner device when the value is equal to or more than a set value or the accelerator pedal is depressed from the set value. apparatus.