JPH01100358A - Engine warmup device - Google Patents

Abstract

PURPOSE:To enhance the warmup characteristics after cold starting by installing a heat exchanger nearer to the engine than a burner mounted on a suction pipe, connecting with this heat exchanger a piping in which thermo-medium flows, and by equipping a selector valve on this piping. CONSTITUTION:A burner 10 is installed on the way of suction pipe 4 of an engine 1, and a heat exchanger 20 is installed downstream this burner 10. Through a three-way valve 7, the heat exchanger 20 is connected with a part of an air pipe 6 which heats inside the cab 5 of a car. Thereby the air sent from the heater body 3 is supplied into the cab 5 while the three-way selector valve 7 generates connection of a medium flowout pipe 22 and a medium flow-in pipe 21 of the heat exchanger 20 to the air pipe 6. The burner 10 and three-way selector valve 7 are controlled by control device 30 on the basis of signals given from a fuel flow sensor 31, a number-of-revolutions sensor 32, and a temp. sensor 33.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine warm-up device, and more specifically, to an engine warm-up device that warms up the engine body after a cold start and can immediately heat the room. Regarding the warm-up device.

[Conventional technology]

Traditionally, indoor heating in automobiles has been carried out by extracting cooling water from the engine 4I through a hot water pipe 42 and circulating it through a heater body 43 (inside of which a heater core and electric blower are installed). It supplied warm air by heating the air.

In addition, in the figure, 44 is a defroster nozzle, and 45 is a control panel.

[Problem to be solved by the invention]

However, in recent years, engines with excellent thermal efficiency, especially small direct injection engines, have found it difficult to warm up the cooling water due to the improved thermal efficiency, and as a result, it takes longer than before to warm up the interior in winter. , Meanwhile, there was a problem that the driver had to drive in a very uncomfortable condition. In order to shorten the time it takes for the room to warm up, various measures have been taken, such as reducing the amount of cooling water and increasing the engine operating temperature by restricting intake air, but none of the above measures are sufficient. It did not lead to solving the problem.

The purpose of this invention is to solve the above problems,
To provide an excellent engine warm-up device capable of not only warming up an engine body after a cold start of the engine but also heating the room immediately after the start.

[Means to solve the problem]

In order to solve the above problems and achieve the above objects, the present invention is configured as follows.

That is, the present invention provides a heat exchanger disposed in an intake pipe line closer to the engine than a burner provided in the middle of the intake pipe line, a pipe through which a medium to be heated for room heating flows is connected to the heat exchanger, The present invention relates to an engine warm-up device characterized in that a switching valve is provided in the piping.

[Effect]

The engine warm-up device according to the present invention is constructed as described above and operates as follows. That is, this engine ring device has a heat exchanger disposed in the intake pipe on the side of the engine from the burner provided in the middle of the intake pipe, and a pipe through which a medium to be heated for room heating flows through the heat exchanger. Since a switching valve is installed in the piping, it is possible to warm up the engine immediately after starting the engine, and even immediately after starting the engine, the air introduced into the driver's cab is sufficient. It is warm and can immediately heat the room, bringing the operating room to a comfortable temperature in a short time even in winter.

[Embodiment] Hereinafter, an embodiment of an engine warm-up device according to the present invention will be described with reference to the drawings.

FIG. 1 is a configuration explanatory diagram showing an embodiment of an engine warm-up device according to the present invention.

A combustor or burner 10 is provided in the middle of an intake pipe 4 of a diesel or gasoline engine 1, and a heat exchanger 20 is provided immediately downstream of the burner 10 in the intake pipe 4. In this embodiment, the heat exchanger 20 is connected via a three-way valve 7.7 to a section of an air line 6 for heating the interior of the driver's cab 5 of the motor vehicle. The three-way switching valve 7.7 is connected to the medium inlet pipe 2 of the heat exchanger 20.
1 and the medium outflow pipe 22 are connected to the air pipe line 6, the air sent from the heater main body 3 is connected to the heat exchanger 2.
The heated medium is sent into the driver's cab 5 through a heated medium passage in the heated medium. 2 is a hot water pipe that circulates cooling water to the heater body 3, and 11 is a fuel passage that supplies fuel from a fuel tank 12 to the burner 10.

The combustion operation of the burner 10 and the switching operation of the three-way switching valve 7.7 are controlled by a control device 30 connected thereto. This control device 30 controls the engine 1
The operating state of the engine 1 is detected based on the input from the fuel flow sensor 31 that detects the fuel flow rate of the fuel injection pump (not shown) and the input from the rotation speed sensor 32 that detects the rotation speed of the engine 1. Burner 10 depending on
It is possible to control the amount of fuel. Furthermore, a temperature sensor 33 that detects the temperature of the cooling water of the engine 1 is connected to the control device 30, and when the temperature of the cooling water reaches the set temperature, the engine 1 is deemed to have warmed up and the burner 10 is activated. The control device 30 operates so that heating is stopped and the three-way switching valve 7.7 is switched so that air for room heating bypasses the heat exchanger 20.

FIG. 2 shows a specific internal configuration of an embodiment of the heat exchanger 20 shown in FIG. The main body casing 23 is provided with bulging annular flow passages 24.25 near both ends thereof, and these annular flow passages 24.25 open into the main body casing 23 on the inside, and open on the outside thereof. A medium inflow pipe 21 and a medium outflow pipe 22 are respectively connected to these. A heat exchange cylinder 26 made of stainless steel or the like is housed inside the main casing 23, which divides the inside of the main casing into inner and outer parts. The heat exchange tube 26 has a pleated tube portion so that heat exchange between the medium flowing inside the tube and the medium flowing through the heated medium passage 28 formed between the outside and the main casing 23 is performed efficiently. Alternatively, it may be wavy so that the contact area is as wide as possible. Furthermore, a baffle rod 27 is provided between the annular channels 24 and 25 inside the heat exchange cylinder 26 so that the medium flowing inside the heat exchange cylinder 26 flows along the inner wall side of the heat exchange cylinder 26. There is.

FIG. 3 is a sectional view showing a specific example of the burner 10. The burner 10 provided in the middle of the intake pipe line 4 is connected to the fuel passage 1.
Fuel vaporization heater 1 provided in the opening in the intake pipe of 1
3 and an ignition heater 14 provided on the downstream side thereof, which generate heat by electric current from the control device 30.

These heaters 13 and 14 may be ceramic heaters that are heated immediately after being energized and reach the vaporization temperature and ignition temperature (900° C.) of the fuel.

When the engine is started with this configuration, the vaporization heater 13 and the ignition heater 14 are immediately heated, and the burner fuel F supplied from the fuel passage 11 is vaporized and then introduced into the intake pipe 4. ignited. When the engine starts, air flows into the intake pipe 4, so the burner fuel F is combusted, and the high-temperature combustion gas G is transferred to the heat exchanger 20.
will be introduced in

Therefore, in the heat exchanger 20 in the engine warm-up device according to the present invention, the combustion gas G from the burner 10 flowing into the heat exchanger 20 from the intake pipe 4 is as shown by the solid arrow in FIG. It flows in a distributed manner through the inner wall of the heat exchange cylinder 26. Air A for room heating that has flowed into the annular flow path 24 from the medium inflow pipe 21 flows through the main body casing 23 and the heat exchange cylinder 2.
6 and the heated medium passage 2, the combustion gas G
It flows from the downstream side to the upstream side as shown by the chain arrow, thereby exchanging heat with the combustion gas G and being heated.

Note that it is desirable to cover the outside of the main body casing 23 of the heat exchanger 20 with a heat insulating material to avoid heat dissipation.

In the engine warm-up device configured as described above, combustion gas G generated in the burner 10 is introduced into the heat exchanger 20 during warm-up operation after starting the engine. Then, air A sent from the heater body 3 (not hot air because the cooling water of the engine 1 is cold) is introduced into the downstream side of the heat exchanger 20 from the medium inlet pipe 21 via the three-way switching valve 7. . Then, it flows in the heat exchanger 20 in the opposite direction to the flow of the combustion gas G, is heated, and is discharged into the operator's cab 5 from the room heating air pipe 6 via the medium outflow pipe 22 and the three-way switching valve 7. Therefore, even immediately after the engine is started, the air A introduced into the driver's cab 5 is sufficiently warm, and even in winter, the interior of the driver's cab 5 reaches a comfortable temperature in a short time.

In addition, since the heat exchanger 20 is located in the middle of the intake pipe 4, the remaining high temperature combustion gas G is introduced into the engine 1 after removing the amount of heat taken away by the indoor heating air A, so that the engine starts. This not only improves performance, but also promotes heat exchange with the cooling water around the cylinder body, improving engine warm-up performance.

Furthermore, if the cooling water is warmed early by the combustion gas G as described above, the air A is once warmed by the heater body 3 and then reheated by the heat exchanger 20, so that the indoor heating effect is further enhanced.

As mentioned above, when the engine 1 is warmed up and the cooling water temperature reaches a temperature sufficient to heat indoor heating air, the temperature is detected by the temperature sensor 33,
As described above, the operation of the burner 10 is stopped by the control device 30, and the heat exchanger 20 of the room heating air A is bypassed.

FIG. 5 shows another embodiment of the engine warm-up device according to the present invention. In this embodiment, the cooling water circulation passage, for example, a part of the hot water piping 2 that circulates cooling water to the heater main body (not shown) is provided with an intake pipe 4 in the same manner as described above.
A heat exchanger 20 installed in the heat exchanger 20 is connected to the heat exchanger 20 via three-way switching valves 7, 7.

During warm-up operation of the engine 1, the burner 10 and the heat exchanger 20 are used to heat the cooling water, thereby improving the startability and warm-up performance of the engine.

The configurations and functions of other parts in this embodiment are the same as those in the embodiment shown in FIG. 1, so the same reference numerals are given and explanations thereof will be omitted.

〔Effect of the invention〕

As explained above, the engine warm-up device according to the present invention includes a heat exchanger disposed in the intake pipe on the side of the engine from a burner provided in the middle of the intake pipe, and the heat exchanger is used for room heating. By connecting piping through which the medium to be heated flows and providing a switching valve in the piping, even in engines with excellent thermal efficiency, engine warm-up performance after cold starting is improved. This has an excellent effect in that the room can be heated even immediately after starting, and the driver does not feel uncomfortable.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing an embodiment of an engine warm-up device according to the present invention, FIG. 2 is a partially cutaway perspective view showing a specific configuration of an embodiment of the heat exchanger shown in FIG. 1, Figure 3 is the first
4 is a sectional view of the heat exchanger showing the flow of the heat exchange medium in the heat exchanger of FIG. 2, and FIG. 5 is a sectional view of the heat exchanger according to the present invention. FIG. 6 is an explanatory diagram showing another embodiment of an engine warm-up device, and FIG. 6 is an explanatory diagram showing an example of a conventional hot water heater for an automobile. 1-----1 engine, 2----some water piping, 3-
・−・−・Heater body, 4−−−−One intake pipe, 6・
−・−・Air pipe line, 7−・−− Three-way switching valve, 10−−−
---Burner, 11--Fuel passage, 12--Fuel tank, 13--Vaporization heater, 14-----
-One ignition heater, 20---One heat exchanger, 24゜2
5--...- annular flow path, 26-- heat exchange tube,
27-----1-Baffle rod, 30--Control device, 31--Fuel flow rate sensor, 32--
・Rotation speed sensor, 33-...--Temperature sensor. Applicant: Isu Jidosha Co., Ltd. Agent Patent Attorney: So Naka Onaka Figure 3 Figure 4
Figure A 6

Claims (1)

[Claims] A heat exchanger is installed in the intake pipe on the side of the engine from the burner provided in the middle of the intake pipe, a pipe through which a medium to be heated for indoor heating flows is connected to the heat exchanger, and a switching valve is installed in the pipe. An engine warm-up device characterized by being provided with.