JPH0684128B2 - Engine warm-up device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine warm-up device having a heating function.

(Prior art) For indoor heating of automobiles, conventionally, the cooling water of the internal combustion engine is taken out by a hot water pipe, passed through a heater body composed of a heater core and a blower, and air is sent to the heater body to heat it. For heating the room, or for heating the room with the amount of heat generated by burning the fuel in the burner regardless of the internal combustion engine.

In such a method of utilizing the cooling water of the internal combustion engine for indoor heating, since the temperature of the cooling water rises slowly, it takes time for the heater body to deliver warm air, and the heating function of the heater during that time is required. Is lost. In addition, in the heating method that uses fuel separately from the internal combustion engine, it takes time to process the odor of combustion and exhaust gas, and the complicated control mechanism and device
The drawbacks are high in cost, and there is still a problem in terms of environmental pollution.

Regarding the above points, the applicants have already filed Japanese Patent Application No. 59-106869.
In order to solve the problems related to indoor heating related to conventional internal combustion, there is no need for a complicated control mechanism, there is no problem of environmental pollution, and there is a technology for an automotive heating system that can be warmed up immediately after starting. Reveals.

(Problems to be Solved by the Invention) In the above-described conventional technology, a burner device for burning fuel is provided in the intake pipe of the engine, and a heat exchanger is provided downstream of the burner device to burn the fuel in the burner device. Since the recovered heat is recovered by the heat exchanger and the recovered heat is used as a heat source for heating, it becomes possible to effectively perform indoor heating immediately after the engine starts, but in cold regions, etc. When the engine was started in, the starting white smoke, odor, and sensation still remained in the exhaust, leaving some points to be improved in engine warm-up.

An object of the present invention is to provide an engine warm-up device that solves the problems of the engine warm-up device that also has a heating function, and that enables smooth switching between start assistance and indoor heating by a burner device. Especially.

(Means for Solving Problems) The present invention is directed to a burner device that burns fuel in an intake pipe of an engine, a heat exchanger downstream of the burner device, heat recovered by the heat exchanger, and engine cooling. A heating device that uses the heat of water as a heat source, and a control unit that detects the cooling water temperature or the heating air temperature and stops and controls the air blowing in the heating device,
Depending on the conditions determined by the engine speed, cooling water temperature, starter motor speed, etc., the ventilation of the heating device is stopped,
In addition, the engine warm-up device is characterized by controlling fuel supply to the burner device.

(Operation) In the above means, when the engine is warmed up by burning the fuel with the burner device at the time of starting the engine, when the temperature is low, the ventilation of the heating device is forced while the start switch is on. Then, the burner device is used only for assisting the engine start, and then the heating device is blown according to a change in the state of the cooling water temperature or the like, and the engine start and the room heating are switched.

(Embodiment) FIG. 1 is a block diagram of an embodiment of an engine warm-up device according to the present invention. As is apparent from the figure, a burner device 5 and a heat exchanger 6 are provided downstream of the burner device 5 in the middle of an intake pipe 4 extending from an air cleaner 2 of a diesel engine or a gasoline engine 1 to an intake manifold 3.
The burner device 5 has a vaporizer 9 for vaporizing the fuel coming from the fuel pump 7 via the fuel control valve 8 and an ignition device 10 for igniting the fuel vaporized by the vaporizer 9.
The ignition device 10 is provided downstream of the vaporizer 9 and has an ignition element for igniting atomized fuel. The fuel atomized by the vaporization device 9 is mixed with air in the burner device 5, the combustible mixture is ignited by the ignition device 10 to form a flame, and the combustion gas is sent to the heat exchanger 6.

The heat exchanger 6 takes in new air from the income air intake 11 communicating with the interior of an automobile requiring heating, and the temperature after the new air takes heat from the combustion gas to perform heat exchange
It has a blower 12 that blows up to 13. The outlet
13 is open at the outlet of a heater core 14 for cooling water, which is separately installed for indoor heating. Therefore, the illustrated blower 15, the evaporator 16 for the air conditioner, and the hot water passage 17 are shown.
Constitute each member of the heater device using cooling water.
Since the blowers 15 and 12 shown in the figure can be used in common, the blower 12 will be described below.

Reference numeral 18 denotes a controller, which is an engine speed signal Ne proportional to a generated voltage from a generator 19 driven by the engine 1 and an ON / OFF switch for the operation switch 20 of the heater device.
The off signal FS, the water temperature signal Tw from the cooling water temperature sensor 21 that detects the temperature of the engine cooling water, the signal L that detects the position of the accelerator lever 22 by the accelerator sensor (potentiometer) 23, and the heating air temperature sensor 29. The signals Tr from and are input respectively. And this controller 18
Responds to the above signals by controlling the fuel control valve 8 to an optimum opening degree, supplies the vaporization device 9 and the ignition device 10 with control signals for performing vaporization and ignition of fuel at optimal timings respectively, The current supply switches 25 and 26 for vaporization and ignition from the power supply 24 are turned on and off. Also,
The controller 18 also controls a switch 27 which operates the blower 12 at the optimum timing. The fuel control valve 8
The drive control is performed by the valve drive control device 28 such as a step motor.

Next, the operation of the engine warm-up device according to the present invention having the above-described structure will be described.

FIG. 2 shows an operation flowchart including warm-up at the start of driving of the engine 1. First, in step a,
Determine whether the start switch such as the ignition switch of the car is on. The start switch forms a circuit for starting the engine by a key-on operation or the like. Although not shown in FIG. 1, the generator 19 is started when the start switch is turned on, and the engine speed signal Ne is sent to the controller 18. To enter.

First, looking at the operation at the time of engine starting in step b and below, in step b, the cooling water temperature is the water temperature sensor.
21 water temperature signal Tw, for example Tw <10 ° C,
That is, when the outside air is low and it is necessary to assist the starting of the engine 1 by heating the intake air, it is determined in step c whether or not the switch of the blower 12 of the heating device is turned on, and the blower 12 rotates. If it is, it is forcibly stopped (step d). Then, the switches 25 and 26 are turned on from the controller 18 to send the hot air for assisting the start of the engine 1 to supply the vaporization heating power to the vaporizer 9 (step e), and the valve drive device 28 turns the fuel control valve 8 on. The fuel is burned by the air flowing into the intake pipe 4 by opening (step f) and driving the ignition device 10 (step g), and the combustion gas flow having a high temperature is introduced into the heat exchanger 6. Since the blower 12 is stopped, the hot air is directly introduced into the engine 1.

Step h is the engine speed signal Ne from the generator 19.
In the step of determining whether or not is less than 3000 revolutions / minute (rpm), it is sensed that the engine 1 has blown up during the starting operation. If Ne <3000 rpm, it means that the starting operation of the engine 1 has not been completed, or that the starting has been completed by the rotation up to the low speed and the key switch has been turned off.
After confirming that the start switch is turned on via c, when the switch is turned on, the combustion gas flow is continuously sent to the engine 1 with the blower 15 stopped. Therefore, while the start switch is turned on immediately after the engine is started, hot air is sent to the engine 1 with the blower 12 stopped until the engine speed becomes high to assist the start.

By the way, as shown in steps a and b above, when the start switch is turned off and the engine start is completed, or when the cooling water temperature becomes 10 ° C. or higher, the switch 27 of the blower 12 is turned off in step i. If the blower 12 is not driven, the process proceeds to step j, the fuel control valve 8 is closed, and the vaporizer 9 and the ignition device
Stop all 10 Blower 12 is blower switch 20
Is turned on, that is, when the driver turns on the heating switch, the heat energy flowing in the heat exchanger 6 is supplied to the air from the air intake 11 for heating air and is blown out.
The heating air is sent from the inside of the vehicle to the interior of the vehicle, but the combustion of the burner 6 is stopped when the blower switch 27 is off.

Further, when the switch 27 of the blower 12 is turned on in step i, when the cooling water temperature Tw is lower than 80 ° C. in step k, the process moves to steps e, f, g to continue the combustion of fuel in the intake pipe 4. The engine 1 is warmed up and the room is heated. When the cooling water temperature Tw is 80 ° C. or higher, the process moves to step j.

When the rotation speed Ne of the engine 1 increases and Ne> 3000 rpm, the process moves from step h to step l, the temperature sensor 29 at the outlet 13 detects the temperature of the heating air, and the temperature Tr
If is lower than 60 ° C, the accelerator lever position is determined in step m. That is, the temperature Tr of the heating air is 60 ° C.
If determined as above, the fuel control valve 8 is closed by 5% from the opening degree at that time (step n), and fuel consumption in the vaporization device 9 is suppressed, but when the heating air Tr is 60 ° C. or lower. The position L of the accelerator lever 22 is, for example, 1/2 of the total depression amount.
In the following cases, the opening of the fuel control valve 8 is increased by 5% (step o) to increase the fuel supply to the vaporizer 9. In this way, the temperature Tr of the heating air is maintained at an appropriate value, for example, 60 ° C. Further, in step m, when the depression amount of the accelerator lever 22 is 1/2 or more of the above, the process proceeds to step j, the fuel control valve 8 is closed, and the current supply to the vaporizer 9 and the ignition device 10 is stopped. . That is, if the rotation speed of the engine 1 is high and the accelerator lever 22 is fully depressed, the indoor heating is performed by driving the blower 12. When the blower 12 is driven, the cooling water in the heater core 14 is cooled. Heating air can be obtained by using the heat of the above as a heat source.

After the operations of the steps j, n, and o are finished, the timer keeps the end state for a certain time, and then the process returns to the step a.

In this way, when the water temperature Tw of the cooling water of the engine 1 is below a certain temperature while the start switch is on, the blower 12 is forcibly stopped to operate the burner device 5 as an aid to the starting operation, Moreover, since the fuel supply to the vaporizer 9 at the time of starting the engine 1 is controlled, the engine 1
The startability is improved, white smoke and odor at the time of starting can be removed, and the engine 1 can be warmed up smoothly.

In the above embodiment, the blower 12 is stopped by detecting the cooling water temperature Tw of the engine 1,
The heating air temperature may be detected as a condition for stopping the blower 12 in order to improve the warm-up property. Further, the fuel supply to the burner device 5 during this period is preferably performed in a larger amount than when it is used as a heating heat source, since it operates exclusively as a starting aid, and the cooling water temperature Tw thereafter is 10 It is also possible to distinguish from the opening amount of the fuel control valve 8 when the temperature is <Tw <80 ° C.

(Effects of the Invention) As described above, in the engine warm-up device according to the present invention, it is possible to stop and control the air blow in the heating device when the start switch is turned on. The start-up can be performed smoothly, and the white smoke, odor and sensation of starting can be removed. Further, since the heating by the burner device and the indoor heating by the cooling water are switched appropriately according to the conditions such as the change of the cooling water temperature, the fuel supply is appropriately controlled and there is no problem of environmental pollution. In addition, it has excellent effects such as effective heating of the room after starting.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an engine warm-up device according to the present invention, and FIG. 2 is a flow chart showing a warm-up operation of the same embodiment. 1 ... Engine, 4 ... Intake pipe, 5 ... Burner device, 6
...... Heat exchanger, 8 …… Fuel supply valve, 9 …… Vaporizer, 10
Ignition device, 12 blower, 14 cooling water heater core, 18 controller.

Claims (1)

[Claims] 1. A burner device for burning fuel in an intake pipe of an engine, a heat exchanger downstream of the burner device, and a heating device using heat recovered by the heat exchanger and heat of engine cooling water as heat sources. And a control means for detecting the cooling water temperature or the heating air temperature to stop and control the blowing of air in the heating device.