JPS598514A - Room heating device of car mounted with water-cooled engine - Google Patents

Abstract

PURPOSE:To obtain a sufficient degree of room heating temperature at cold time of an engine, by taking out cooling water from a water jacket for central cylinders divided by partitions in the cooling water jacket, heating the cooling water through a heat exchange with exhaust gas, and then guiding the water to a room heating heater core. CONSTITUTION:A cooling water jacket 1 in a 4-cylinder engine E is divided by partitions P1, P2 into a high temperature part water jacket 1a and a low temperature part water jacket 1b. Then cooling water in the low temperature part water jacket 1b flows in through a circulative route 20 interposing a radiator 21 by driving of a pump 23 and is cooled, and then returned from a flow inlet 17 into the water jacket 1b. While cooling water in the high temperature part water jacket 1a is firstly guided to a heat exchanger 10 by driving of a pump 22 and heated by exhaust gas flowing in an exhaust passage 9, and then guided to a heater core 5 of an air conditioner to heat air conditioning air, thereafter the water is returned from a flow inlet 2 into the water jacket 1a. At completion of warming operation, a thermostat valve 16 is opened to the side of a bypass passage 14, and the cooling water is cooled by a radiator 15.

Description

[Detailed description of the invention] The present invention relates to a heating device for a vehicle equipped with a water-cooled engine.

BACKGROUND ART In order to improve the comfort of vehicles, especially automobiles, during winter operation, heating the interior of the vehicle is essential. Currently, in the case of a car or a vehicle equipped with a water-cooled engine, a hot water type heating device that utilizes the heat of engine cooling water is used as a heating device.

However, in conventional hot water type heating systems, the temperature of the cooling water is not high enough, especially when the engine is cold, and therefore the single-stage heating system is not sufficiently effective. This is because when the engine is cold, the head of the Ennon is quite hot, but the block is at a low temperature. 1
This is thought to be due to the fact that the quality is averaged at 7 and fl- results in a low quality of 7.

Therefore, in JP-A-Sho, t'l-202'1g,
An engine cooling water flow mechanism has been proposed in which the engine cooling water is kept as high as possible by flowing the cooling water only to the head section where the temperature is high when the engine is cold. If this water passage mechanism is used, the temperature of the cooling water can be raised to a certain extent, but even with this, it may not be possible to obtain a sufficient heating temperature.

In addition, in cars equipped with water-cooled engines, the cooling water that has been heated to some extent by the 7 rings is further heated using the heat of the exhaust gas, and this further heated lj cooling water is used for heating. Although there are some, there are cases where even this does not provide sufficient heating temperature. The above-mentioned drawbacks of conventional heating devices are particularly noticeable in diesel engines with good combustion efficiency, and improvements have been desired.

Therefore, in view of the above-mentioned drawbacks of hot water type heating devices that utilize the heat of cooling water, the present invention aims to further heat the cooling water heated in the high temperature section of the cylinder using the heat of exhaust gas. It is an object of the present invention to provide a heating device for a vehicle equipped with a water-cooled engine, in which a sufficient heating temperature can be obtained by sending water to a heater core.

That is, the heating system for a vehicle equipped with a water-cooled engine according to the present invention extracts cooling water only from the central cylinder water cannula, which is a relatively high-temperature part of the cooling water cannula of the engine body of an engine with multiple cylinders arranged in parallel. A heater cooling water circulation path is provided in the passage and returns the cooling water to the central cylinder water canister through a heat exchanger that heats the cooling water for heat exchange with exhaust gas and a heater core for heating the vehicle interior; The present invention is characterized in that cooling water is circulated through the circulation path at least when the Ennon is being cooled.

The cooling device of the vehicle equipped with a water-cooled engine of the present invention having the above structure extracts cooling water from the water canister for the central cylinder of the multi-cylinder, which is relatively hot even when the engine is cold, and uses this cooling water to cool the exhaust gas. Since hot metal is used for further heating and the sufficiently heated cooling water is sent to the heating heater core, a sufficient heating temperature can be obtained even when the engine is cold.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating system for a vehicle equipped with a water-cooled ennon according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a heating system for a vehicle equipped with a water-cooled engine according to a first embodiment of the present invention.

In FIG. 1, reference numeral E indicates a q-cylinder water-cooled engine mounted on an automobile (not shown), and a cooling water canister 1 is installed outside the combustion chamber of this engine E. This cooling mantle 1 is divided by partitions iP□ and P2, and
It is divided into a water cannula 1a for the third cylinder and a water cannula 1b for the first and third cylinders. The water cannula 1a for the first and third cylinders is the cooling water cannula 1.
The water jacket 1b for the first and third cylinders is the high temperature part of the cooling water #
It forms the low temperature part of 1. Hereinafter, the water jackets for the λ-th and third cylinders will be referred to as high-temperature water jackets, and the water jackets for the first and third cylinders will be referred to as low-temperature water jackets.

The high temperature section water jacket 18 has a cooling water inlet 2 and an outlet 3.
is formed. The inlet 2 and outlet 3 are:
They are communicated by a heating cooling water circulation path 4, and a heater core 5, which is a heat exchanger, is interposed in this circulation path 4. This heater core 5 heats the air sent by the blower 6 by heat exchange with the heated cooling water passing through the heater core 5. This heated air is introduced into the vehicle interior for heating purposes.

The blower 6 is operated by a manual blower switch 7 having the following switches: OFF, LOW, HI.

In the figure, reference numeral 8 indicates an exhaust manifold, and an exhaust passage 9 is connected to the exhaust manifold 8. A heat converter 10 is provided in the middle of this exhaust passage 9 and between the outlet 3 of the circulation route 4 and the heater core 5, and the cooling water sent to the heater core 5 through the circulation route 4 is transferred to this heat converter 10. It is heated in the heat exchanger 10 by exhaust gas. □
A bypass passage 11 is formed in the exhaust passage 9 and bypasses a portion where the heat exchanger 10 is provided. The temperature of the cooling water flowing into the circulation path 4 from the outlet 3 is sufficiently high in the bypass passage 11, and the cooling water is transferred to the heat exchanger 1.
This is for flowing exhaust gas when there is no need to heat it. For this reason, a switching valve 12 is provided at the branch of the bypass passage 11 from the exhaust passage 9 to adjust the exhaust gas between the exhaust passage 9 where the heat exchanger 10 is provided and the pipe/gas passage 11. It is designed to flow.

An on-off valve 13 is provided on the downstream side of the heater core 5 in the circulation passage 4, and this on-off valve 13 is closed when the heating device is not needed to prevent cooling water from being sent to the heater 1a5. be.

The circulation path 4 is provided with a bypass passage 14 that bypasses the heater core 5 and the heat exchanger 10. This bypass passage 14 is provided with a radiator 15 that cools the cooling water flowing through the bypass passage 14 . This bypass passage 14 is designed to prevent cooling water from flowing into the heat exchanger 10 and the circulation path 4 on the heater core 5 side when heating is not performed. For this reason, a switching valve 16 is installed at the branch part of the circulation path 4 and the pie-tass passage 14.
is provided so that the cooling water is regulated to flow between the circulation path 4 where the heat exchanger 10 and the like are provided and the piping passage 140.

On the other hand, a cooling water inflow 1] 11 and an outflow port 18 are also formed in the low temperature section water cannula 1b. This inflow 1''17 and outflow 1
"18 is connected to the radiator cooling water circulation path 20, and this circulation path 20 is connected to the radiator cooling water circulation path 20.
1 is provided. The heating circulation path 4 and the lassoator circulation path 20 are completely independent.

9'L, a first water pump 22 is connected to the circulation path 4.
However, the λ-th water pump 023 is in the circulation path 20,
They are all set up separately. The water pumps 22 of # and / are controlled by a control circuit 24 consisting of a microcomputer.
On the other hand, the water pump 02 described above is driven and controlled by
3 is driven by 1 by Ennon E.

The circulation path 20 is provided with a bypass passage 25 through which the lassoator 21 is pumped. This bypass passage 2
5 is to help warm up the Ennon by circulating the cooling water without passing through the lanoator 21 when the Ennon is in a cold state.9. It is. For this reason, a thermostat valve 26 is provided at the branching portion of the circulation passage 20 and the bypass passage 25, so that the cooling water is allowed to flow into the bypass passage 25 when the ennon is sufficiently warmed up.

A water temperature sensor 2γ for detecting the temperature of the cooling water in this part is provided in the high temperature part water jacket 1a.
The 7 output terminals are connected to the 7 input terminals of the control circuit 24. A blower switch 7 is connected to the other input terminal of the control circuit 24, and the control circuit 24 receives a heating device ON/OFF signal S from the blower switch 7.
□, upon receiving the signal S2 indicating the cooling water temperature from the water temperature sensor 2γ, the switching valve 12.16 and the opening/closing valve 13
control.

Next, the operation of the heating device having the structure described above will be explained.

1. The operation of the heating system when Ennon E is in a cold operating state will be explained. When the blower switch 1 of the heating device is moved from the OFF state to the ON range of LOW or H.1, a signal S indicating this and a signal S2 from the water temperature sensor 21 are input to the control device 24. This control circuit 24 connects the switching valve 12 to the bypass passage 11.
is set to the closed position, and the on-off valve 13 is opened. 1. Furthermore, since the temperature of the cooling water is low, the switching valve 16 is also set by the control circuit 24 to flow the cooling water to the total circulation path 4 side. On the other hand, since the temperature of the cooling water is low, the thermostatic valve 26 is opened so that the cooling water flows into the bypass passage 25.

4, the control circuit 24 receives the signal S from the blower switch 7.
The first water pump 7'22 is driven by □ to circulate cooling water into the circulation path 4.

The cooling water circulated in the circulation path 4 is heated by the cylinder head of the Ennon E in the central cylinder water jacket 1a. The cooling water heated by this cylinder head flows into the circulation path 4 from the outlet 3 and enters the heat exchanger 10.
It is further heated by the exhaust gas flowing through the exhaust passage 9. This further heated cooling water is sent to the heater core 5.

The heater core 5 heats the air sent from the blower 6 and sends it into the vehicle interior to heat the vehicle interior. The cooling water that has passed through the heater core 5 is returned to the central cylinder water cannula 1a from the inlet 2 by the water pump 022. In this way, the cooling water is sufficiently heated by the relatively high temperature central cylinder section and the heat exchanger 10, so that a sufficient heating temperature can be obtained even when Ennon E is at a low temperature.

The rotation speed of engine E gradually increases, and the center cylinder water mantle 1
When the water temperature sensor 2γ detects that the temperature of the cooling water in the a is higher than a predetermined temperature, the control circuit 24 causes the changeover switch 12 to open the bypass passage 11 and close the exhaust passage 9 on the heat exchanger 10 side. Set to . Thus, heating of the cooling water by the exhaust gas in the heat exchanger 10 is stopped, and overheating of the cooling water and the ennon is prevented. At this time, the control circuit 24 and the switching valve 16 also gradually switch off the cooling water. It is set so that it passes through the gas passage 14 side. The cooling water flowing to the bypass passage 14 side is cooled in the radiator 15,
It merges with the cooling water passing through the circulation path 4 and lowers the temperature of the entire cooling water. Thus, from this point as well, overheating of the cooling water and the high temperature portion of the engine E is prevented.

On the other hand, the second water pump 023 is driven by Ennon E to circulate the cooling water to the circulation path 20.
As mentioned above, when the engine E is cold, the thermostat valve 26 is set to allow the cooling water to flow into the bypass passage 25, so the cooling water does not flow through the radiator 21, and therefore does not radiate heat. , thus promoting the warming up of Ennon E. When the rotational speed of Ennon E gradually increases and the temperature of the cooling water circulating in the circulation path 20 reaches a predetermined temperature or higher, the thermostat valve 26 gradually opens so that the cooling water also flows into the radiator 21, thus causing the cooling water to flow through the radiator 21. is cooled in the radiator 21 to prevent the cooling water and the cylinder lock portion of the engine E from overheating.

In the above heating device, the /th water pump 7°22
Basically, when the heating system is in operation, it is sufficient to rotate it at a constant rotation speed, and when the heating system is not in use, it is necessary to rotate it according to the temperature of the cooling water detected by the water temperature sensor 27, the engine load, the rotation speed, etc. Alternatively, the water pump 22 may be stopped during cranking.

For example, when controlling the water pump 22 according to the temperature of the cooling water, the water pump 22 is rotated at a constant high rotation speed to improve heating performance when the heating system is in operation, and when the heating system is not in use. As shown in Figure Ω, the water pump is operated at a constant low speed until the temperature of the cooling water detected by the water temperature sensor 27 reaches the first predetermined temperature T□ to prevent local overheating. At the same time, Ennon's warm-up was promoted.

Then, when the temperature of the cooling water reaches temperature T2, the rotation speed of the water pump 22 is increased according to the rise in the temperature of the cooling water to prevent overheating of the ennon, and thereafter it is operated at a constant rotation speed. . The case where the operation of the water pump 22 is controlled according to the cooling water temperature has been explained above, but since local overheating of Ennon E may occur even when the load increases, It is desirable to control the rotation speed of the water pump 22 according to the increase in the number of rotations. -! However, when starting the engine, that is, during cranking, it is desirable to temporarily stop the operation of the walk pump 22 as described above, in order to prevent deterioration of startability due to a voltage drop caused by the operation of the water pump 22.

In order to perform the above control, in addition to the water temperature sensor 27,
It is necessary to provide an engine load sensor, an engine speed sensor, and a cranking sensor, and to input the output signals of these sensors to the control m41 circuit.

Furthermore, if the exhaust port EX of each cylinder is arranged inside the intake port IN as shown in Fig. 9, it will be difficult for the heat from the exhaust port side, which is relatively at a stratified temperature, to escape. It's depressing.

In the above embodiment, the operation of the water pump 22 is controlled by the control circuit 24 using a microcomputer, but this control may also be performed by an electric circuit as shown in FIG.

The electric circuit 31 shown in FIG. S is a drive control circuit for the water pump 22, and includes a differential amplifier 31 and a drive transistor 32 whose base is connected to the output terminal of the differential amplifier 31. A water temperature sensor 27 is connected to one input end of the differential amplifier 31, and a constant voltage generator 33 that generates a constant voltage vr is connected to the other input end.

The differential amplifier 31 connects the constant voltage (1) and the water temperature sensor 27.
detects the temperature of the cooling water in the high temperature section water cannula 1a, compares it with the output signal S2, and outputs a difference signal Sd2. The transistor 32 outputs this difference signal S when the cooling water temperature is equal to or higher than □.
The operation of the water pump 51 is controlled using a current corresponding to d2 as shown in FIG.

As mentioned above, the pump 22 is heavy because it rotates at a constant low speed when the cooling water reaches the first predetermined temperature, so the pump 22 has a constant low weight: It is also connected to a power source 34 that generates pressure.

A blower switch I is interposed between the power supply 34 and the pump 22, and when the blower switch 1 is turned on, the pump 22 will adjust the cooling water temperature to a predetermined temperature of 1-0.
It can be rotated at a constant angle. As a result of the above, pump 2
The 2rri as a whole is driven as shown in Fig. 7, but in order to supply a large amount of current to the starter St during cranking, that is, when starting the engine, the It is important to provide a relay 35 that cuts off the operating circuit of the pump 22 when the starter St is turned on. In addition, switch γ operates the heating system,
For example, it closes in conjunction with the ON state of the blower switch, turns on the transnoster 32 regardless of the water temperature, and rotates the water pump 22 at a predetermined rotational speed.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a heating device according to a first embodiment of the present invention, Fig. 1 is a graph showing an example of operation of a first water pump, and Fig. 3 is a λth embodiment of the present invention. Figure 1 is a plan view showing an example of the arrangement of intake and exhaust ports for each cylinder; Figure S is a circuit diagram showing an example of the electric circuit that operates the first water pump. . [... Engine, 1... Cooling water mantle, 1a... Water mantle for central cylinder, 1b... Water mantle for outer cylinder, 4... Cooling water circulation path for heating, 5... Heater core, 9. ...exhaust passage, 10...heat exchanger, 20...cooling water circulation path for radiator, 22...first water pump 0.2
3... No. 1 water pump, 24... Control circuit. Patent applicant: Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] Cooling water is extracted only from the central cylinder water mantle, which is a relatively high-temperature part of the cooling water mantle of the Ennon main body of Taizo's engine, which has multiple cylinders arranged in parallel, and is installed in the exhaust passage, where it exchanges heat with the exhaust gas. A heater cooling water circulation path is provided for returning the cooling water to the center cylinder water canister through a heat exchanger for heating the cooling water and a heater core for heating the vehicle interior, and the cooling water is circulated through the circulation path at least when the engine is cold. let'
Heating system for cars equipped with two water-cooled engines.