JPH0633755B2 - Warm-up device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a warm-up device for an internal combustion engine for a vehicle.

[Prior Art] In a general vehicle heating device, cooling water of an engine is caused to flow through a hot water heat exchanger to heat heating air and blow it out into a vehicle compartment. However, since the exhaust temperature of the diesel engine is lower than that of the gasoline engine, rapid heating is difficult, and especially when it is cold, it takes a considerable amount of time to raise the temperature of the vehicle compartment to a predetermined temperature and remove the frost on the window after the engine is started. Requires. In addition, in a low load operation of the engine such as when the vehicle travels on a long downhill road, the heating capacity may be insufficient.
Further, in the diesel engine, when the temperature of the cooling water of the engine is lowered by the operation of the heating device, incomplete combustion of the fuel in the combustion chamber occurs, and white smoke or odor may be generated in the exhaust gas.

Therefore, for example, in the diesel engine disclosed in Japanese Patent Laid-Open No. 55-160158, the combustion gas of the intake air heating combustor disposed inside the intake pipe is introduced into the cylinder while the engine is stopped to heat the combustion chamber. However, the startability of the engine is improved. But,
In the above-mentioned engine, a mechanism for holding the exhaust valve in the open state while the engine is stopped must be provided, which not only complicates the configuration considerably, but also rapidly heats only the combustion chamber because the outer wall of the cylinder is not heated. Is surrounded by cooling water, soot is attached to the combustion chamber and water is accumulated, which is not preferable.

[Problems to be Solved by the Invention] In view of the above problems, an object of the present invention is to supply the combustion gas of a combustor disposed adjacent to the intake pipe to the intake pipe, and to partially discharge the combustion gas. It is intended to provide a warm-up device that allows the cooling water to flow through the heating pipe disposed in the water chamber to heat the cooling water to smoothly start the engine.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention has a combustor disposed adjacent to an intake pipe of an engine, a blower for supplying combustion air, and a fuel vaporization. Is connected to the combustor, and the outlet of the combustor is connected to the downstream side of the on-off valve provided in the intake pipe, and one end of the heating pipe that penetrates the water chamber of the cylinder head is connected to the intake pipe. The other end is connected to an exhaust pipe, respectively, and an electronic control unit that closes the opening / closing valve for a predetermined time before and after the engine is started and drives the blower and the fuel vaporizer, and discharges a part of the combustion gas of the combustor. The remainder of the heating pipe is supplied to the combustion chamber of the engine.

[Operation] Since the intake / exhaust valves before starting of the engine are almost closed, the combustion gas from the warm-up combustor flows from the intake pipe through the heating pipe to the exhaust pipe. Therefore, as a result of the cooling water chamber being heated by the heating pipe and the temperature of the entire engine gradually increasing, a smooth engine start and quick warm-up operation can be achieved.

[Examples of the Invention] The present invention will be described based on examples. FIG. 1 shows an internal combustion engine 1 equipped with a warm-up device according to the present invention. Cooling water chamber 16
The upper end of the cylinder block 14 having the
It is closed by a cylinder head 20 having a, and a combustion chamber 30 is defined between the cylinder head 20 and the piston 12 fitted in the cylinder block 14. The intake port 13 and the exhaust port 15 of the cylinder head 20 are opened and closed by a pair of intake / exhaust valves 11 provided for each cylinder. The intake / exhaust valve 11 is a known tapet mechanism 40.
Is opened and closed by the rotation of the engine.

As shown in FIG. 2, the exhaust port 15 is connected to the exhaust manifold 24, while the intake port 13 is connected to the intake manifold 9.

As shown in FIG. 1, an opening / closing valve 39 is arranged in the middle of the intake pipe 2 connected to the intake manifold 9,
For introducing intake air into the warm-up combustor A upstream of the duct 33
However, the ducts 38 for discharging the combustion gas of the warm-up combustor A to the intake manifold 9 are respectively connected to the downstream side.

The warm-up combustor A is configured by arranging a combustion cylinder 3 which is made of ceramics and has an air inlet on its peripheral wall inside a cylindrical housing 37. A partition wall 35 made of ceramics having a large number of pores is arranged inside the combustion cylinder 3, the partition wall 35 divides an ignition chamber 34 and a combustion chamber 36, and an outlet of the combustion chamber 36 is connected to a duct 38.

The duct 33 is connected to the annular chamber between the housing 37 and the combustion tube 3. A duct 4 a for introducing outside air from the blower 4 is connected to the peripheral wall of the housing 37. The ignition chamber 34 is provided with the ignition glow plug 8, and the combustion vaporizer 7 is projected from the combustion chamber 36 through the partition wall 35 to the heating portion of the ignition glow plug 8. A vaporization glow plug (not shown) is provided inside the fuel vaporization device 7, and fuel is supplied from the oil feed pump 5 to the outer peripheral side of the vaporization glow plug through the fuel pipe 18.

The blower 4, the ignition glow plug 8, the fuel vaporizer 7, and the oil pump 5 are controlled by the electronic control unit 17.
The electronic control unit 17 controls the operation of the warm-up combustor A based on signals that detect the outside air temperature, the temperature of the combustion chamber of the engine, the operating condition of the warm-up combustor A, and the like.

As shown in FIG. 1, according to the present invention, the cylinder head 2
The heating pipe 21 is arranged in the cooling water chamber 16a of 0. As shown in FIG. 2, one end of the heating pipe 21 is connected to the intake manifold 9 via the connection pipe 23. The other end of the heating pipe 21 is connected to the exhaust manifold 24 via the connection pipe 25. An on-off valve 26, which opens only during warm-up, is arranged in the middle of the connecting pipe 25. A lever 32 connected to the valve shaft of the opening / closing valve 26 is connected to the plunger 31 of the electromagnetic actuator 27. The electromagnetic actuator 27 is also controlled by the electronic control unit 17 or manually operated.

Although not shown in FIG. 1, the warm-up combustor A switches the connection of the duct 38 with the intake pipe 2 to the connection with a heating heat exchanger (not shown) to heat the heating heat. The heating air introduced into the exchanger can be heated and blown into the passenger compartment to achieve rapid heating of the passenger compartment. However, since such a configuration is not directly related to the gist of the present invention, description thereof will be omitted.

Next, the operation of the warm-up device according to the present invention will be described.
When the engine is started, the blower 4 is first driven while the engine is stopped (before starting), and combustion air is supplied from the duct 4a through the housing 37 to the ignition chamber 34 and the combustion chamber 36 of the combustion cylinder 3. At the same time, the ignition glow plug 8 is energized, the vapor glow plug of the fuel vaporizer 7 is heated, the fuel from the oil feed pump 5 is vaporized by the vaporization glow plug, and is jetted from the nozzle to the vicinity of the ignition glow plug 8. To be done. The fuel ignited by the ignition glow plug 8 has a partition wall 35.
Enters the combustion chamber 36 through a large number of pores, is mixed with combustion air in the combustion chamber 36, and is completely burned, and is supplied from the duct 38 to the intake manifold 9 via the intake pipe 2. At this time,
The on-off valve 39 closes the intake pipe 2.

Part of the combustion gas supplied to the intake manifold 9 enters the heating pipe 21 through the connection pipe 23 and heats the cooling water chamber 16a of the cylinder head 20. Then, it is discharged to the exhaust manifold 24 from the connecting pipe 25 including the opening / closing valve 26. In this way, the cooling water chamber 16a of the cylinder head 20 is rapidly heated by the combustion gas of the warm-up combustor A, so that the remainder of the combustion gas is directly introduced from the intake port 13 into the combustion chamber 30. The effect results in a smooth start of the engine at the same time as cranking.

After the engine is started, the on-off valve 39 is fully opened or half-opened to guide a part of the intake air from the intake pipe 2 to the engine and the duct 33
Alternatively, the combustion air may be sent to the warm-up combustor A via.

Even after the engine is started, the warm-up combustor A is operated for a predetermined time, and the combustion gas of the warm-up combustor A is mixed with fresh air introduced into the intake pipe 2 through an air cleaner (not shown) to mix the engine. The engine warm-up operation is completed within a short time. At the same time, if the combustion gas of the warm-up combustor A is supplied to the heating heat exchanger, the vehicle interior can be rapidly heated.

In this way, when the warm-up operation of the engine and the rapid heating of the vehicle compartment are achieved, the on-off valve 39 is fully opened, and the operation of the warm-up combustor A is stopped.

[Advantages of the Invention] As described above, according to the present invention, the combustor is disposed adjacent to the intake pipe of the engine, and the blower that supplies the combustion air and the fuel vaporizer that vaporizes and supplies the fuel are combusted. The outlet of the combustor is connected to the downstream side of the on-off valve installed in the intake pipe, and one end of the heating pipe that penetrates the water chamber of the cylinder head is connected to the intake pipe and the other end is connected to the exhaust pipe. An electronic control unit that closes the on-off valve and drives the blower and the fuel vaporization device for a predetermined time before and after starting the engine, and transfers a part of the combustion gas of the combustor to the heating pipe and the rest to the combustion chamber of the engine. Since it is supplied to, the following effects can be obtained.

The combustion gas of the combustor is supplied to the intake pipe and discharged from the intake pipe to the exhaust pipe through the heating pipe arranged in the water chamber of the cylinder head. Is effectively used to heat the cooling water in the water chamber, contributing to a smooth start of the engine and a reduction in warm-up operation.

Since the heat exchange part is not required in the combustor, the structure of the combustor becomes very simple.

Since the combustion gas heats the cooling water while flowing through the heating pipe of the water chamber, there is a possibility that the rupture due to the rise in the pressure of the water pipe may cause water leakage to the outside, as compared with the case of heating the water pipe as in the conventional example. There is no.

Due to the synergistic effect that part of the combustion gas heats the cylinder head through the cooling water reasonably and the rest of the combustion gas enters the combustion chamber of the cylinder and heats the combustion chamber, thermal deformation of each part due to rapid heating Can be prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a warm-up device according to the present invention, and FIG. 2 is a plan view of the same. A: combustor, 2: intake pipe, 4: blower, 7: fuel vaporizer, 9: intake manifold, 16a: cooling water chamber, 17:
Electronic control device, 20: Cylinder head, 21: Heating tube,
24: Exhaust manifold, 39: Open / close valve

Claims (1)

[Claims] 1. A combustor is arranged adjacent to an intake pipe of an engine,
A blower that supplies combustion air and a fuel vaporizer that vaporizes and supplies the fuel are connected to the combustor, and the outlet of the combustor is connected to the downstream side of the on-off valve provided in the intake pipe, and the cylinder head An electronic control in which one end of a heating pipe penetrating the water chamber is connected to the intake pipe and the other end is connected to the exhaust pipe, and the opening / closing valve is closed for a predetermined time before and after the engine is started and the blower and the fuel vaporizer are driven. A warm-up device comprising a device and supplying a part of combustion gas of a combustor to a heating pipe and the remainder to a combustion chamber of an engine.