JPH09277818A - Vehicular heating device and electric pump device for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for heating interior after an engine stops at low price by applying a conventional engine. SOLUTION: A check valve 14 for stopping current of cooling water flowing from a delivery port 11b side of an electric pump 11 to an intake port 11a side is disposed in a by-pass passage 13 making a detour to avoid the electric pump 11 and communicating the intake port 11a side with the delivery port 11b side of the electric pump 11. Whereby, both cases in which the cooling water is supplied to a heater core 8 by operating a machine type pump 1a and the cooling water is supplied to the heater core 8 by operating the electric pump 11 are controlled by a simple means such that the check valve 14 is disposed in the by-pass passage 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle heating system for heating a vehicle compartment by using a cooling water of a water-cooled engine (hereinafter abbreviated as "engine") as a heat source. It is suitable for use in so-called hybrid type automobiles that are switched and used.

[0002]

2. Description of the Related Art A hybrid vehicle is a vehicle designed to reduce exhaust gas containing substances harmful to the human body such as carbon monoxide and nitrogen oxides emitted from an ultra low combustion engine. Specifically, the vehicle normally travels with a motor driven by the electric power charged in the battery, and when the electric power charged in the battery falls below a predetermined level, the vehicle travels using the engine to generate and charge the battery, When the charged electric power is restored to a predetermined level or higher, the motor runs again. Alternatively, when the traveling load is low, for example, when the vehicle is idling or traveling downhill, the motor travels, and when the traveling load is high, the engine travels only, or the engine and the motor are used in combination.

By the way, also in a heating system for a hybrid type automobile, as in a conventional vehicle in which only an engine is mounted as a drive source, a heater core having a cooling water of the engine as a heat source is utilized as a heating means for air blown into the passenger compartment. There is. Therefore, in the means disclosed in Japanese Patent Laid-Open No. 221233/1993, a mechanical pump that drives by obtaining driving force from an engine and an electric pump that drives by obtaining power from a battery are arranged in parallel between the engine and the heater core. The electromagnetic valves are provided on the discharge sides of the mechanical pump and the electric pump, respectively. Then, when the engine is operating, the solenoid valve arranged on the discharge side of the electric pump is closed to supply cooling water to the heater core by the mechanical pump, and when the engine is stopped, the solenoid valve arranged on the discharge side of the mechanical pump is closed. The cooling water is supplied to the heater core by an electric pump.

[0004]

By the way, in an ordinary vehicle, the mechanical pump is built in the engine, and in order to arrange the mechanical pump and the electric pump in parallel as described in the above publication, it is necessary to install the mechanical pump in the engine. Since the cooling water flow must be changed, it requires a major engine modification.
Therefore, in order to realize the means described in the above publication, a large capital investment such as a mold and a machine tool is required in association with the engine modification, which causes an increase in manufacturing cost of the hybrid vehicle heating device.

The above-mentioned problem is not limited to the hybrid type vehicle. For example, in a conventional vehicle equipped with only an engine as a drive source, the heating operation is continuously performed while the idle operation is performed while the vehicle is waiting for a signal. It also occurs in a vehicle heating system that is capable of so-called rest mode operation, which sometimes stops the engine. In view of the above points, the present invention is
An object of the present invention is to provide a device that can inexpensively heat a vehicle interior even after the engine is stopped without modifying the existing engine.

[0006]

The present invention uses the following technical means in order to achieve the above object. In the invention according to claim 1 or 2, the mechanical pump (1a) for obtaining the driving force from the water-cooled engine (1) to circulate the cooling water is applied to a vehicle in which the water-cooled engine (1) is built in. In a vehicle heating device capable of heating even when (1) is stopped, the electric pump mechanism (11) is bypassed and the electric pump mechanism (11, 104) is provided with a suction port (11a, 102) side and a discharge port (11b, 103). ) Side, the cooling water flow flowing from the discharge port (11b, 102) side of the electric pump mechanism (11) toward the suction port (11a, 103) side is closed in the bypass flow path (13, 112). A check valve mechanism (14, 114) is provided.

As a result, the cooling water discharged from the water-cooled engine (1) circulates through the heater core (8) through the bypass flow passages (13, 112) when the water-cooled engine (1) is operating, and when the water-cooled engine (1) is stopped. Electric pump mechanism (1
It circulates to the heater core (8) via 1). That is, without modifying the water-cooled engine (1), the mechanical pump (1
It is possible to control both the case where a) is operated to supply the cooling water to the heater core (8) and the case where the electric pump mechanism (11, 104) is operated to supply the cooling water to the heater core (8). it can.

Therefore, it is possible to suppress an increase in the number of parts of the vehicle heating system, and it is not necessary to make a capital investment for modifying the water-cooled engine. As a result, it is possible to suppress an increase in manufacturing cost of the vehicle heating device. In addition, the check valve mechanism (14, 114) has a bypass flow path (13, 11).
The cooling water is circulated in the electric pump mechanism (11, 104) and the bypass passages (13, 112) when the water cooling engine (1) is stopped by a simple means. Water chute circuit condition can be prevented.

Further, when the water-cooled engine (1) is in operation, the cooling water discharged from the heater core (8) is supplied to the bypass passage (1).
(3, 112) and then returned to the water-cooled engine (1), the electric pump mechanism (1) is operated when the water-cooled engine (1) is operating.
The water flow resistance of the cooling water can be reduced as compared with the case of returning to the water-cooled engine (1) after passing through the inside of the cooling water.

According to the second aspect of the invention, the bypass flow passage (112) and the check valve mechanism (14, 114) house the housing (101) for accommodating the electric pump mechanism (104).
It is characterized in that it is formed inside. As a result, the electric pump mechanism (104), the bypass flow passage (112) and the check valve mechanism (114) are integrated, so that they can be assembled into the vehicle heating device by a single operation. Therefore, since the assembling property of the vehicle heating device is improved, an increase in manufacturing cost of the vehicle heating device can be suppressed.

According to the third aspect of the present invention, the bypass flow passage (112) bypasses the electric pump mechanism (104) to connect the suction port (102) side and the discharge port (103) side.
And a check valve mechanism (114) for closing the flow of cooling water flowing from the discharge port (103) side to the suction port (102) side, the housing (10) housing the electric pump mechanism (104).
1) is formed inside.

As a result, the electric pump mechanism (104),
Since the bypass passage (112) and the check valve mechanism (114) are integrated, the same effect as the invention according to claim 2 can be obtained. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (First Embodiment) FIG. 1 is a schematic diagram when the vehicle heating device according to the present embodiment is applied to a hybrid vehicle. Reference numeral 1 denotes a water-cooled engine for running the vehicle (hereinafter abbreviated as engine), and reference numeral 1a denotes a mechanical pump that obtains driving force from the engine to pump engine cooling water (hereinafter abbreviated as cooling water). Reference numeral 2 denotes a vehicle traveling motor that is driven by obtaining electric power from a battery 3 that stores the electric power generated by the engine, and switches the motor 2 and the engine 1 to perform traveling operation as described above. Further, 4 is a capacitor that temporarily stores the regenerative electric power generated during braking, and the electric power stored in this capacitor 4 is finally stored in the battery 3.

Reference numeral 5 is a radiator for cooling the cooling water by exchanging heat between the cooling water and air outside the vehicle compartment, and 6 is a bypass circuit for bypassing the radiator 5 and allowing the cooling water to flow. Reference numeral 7 is a well-known thermostat that switches between flowing the cooling water flowing out from the engine 1 to the radiator 5 and flowing it to the bypass circuit 6. The thermostat 7 is a radiator 5 which is responsive to the temperature of the cooling water flowing in the thermostat 7.
And the bypass circuit 6 are switched.

Reference numeral 8 is a well-known heater core that heats the air blown into the vehicle compartment by using cooling water as a heat source. The heater core 8 is arranged in an air conditioning casing 10 described later. Reference numeral 9 denotes a blower that blows air. The air blown by the blower 9 flows through the air conditioning casing 10 that forms an air flow path and is heated by the heater core 8,
It is blown out toward the passenger compartment. The operating state of the blower 9 is controlled by the control device 12 described later.

Reference numeral 11 denotes an electric pump (electric pump mechanism) which receives electric power from the battery 3 and pressure-feeds the cooling water toward the heater core 8. The operating state of the electric pump 11 is controlled by the controller 12. The suction port 11a of the electric pump mechanism is connected to the discharge port 8a side of the heater core 8, and the discharge port 11b of the electric pump mechanism is connected to the engine 1.
Is connected to the cooling water inflow port 1b side.

Reference numeral 13 is a bypass flow passage that bypasses the electric pump 11 and connects the suction port 11a side and the discharge port 11b side of the electric pump mechanism to each other.
A check valve (check valve mechanism) 14 that closes the flow of the cooling water flowing from the discharge port 11b side toward the suction port 11a side is arranged. A signal 1b from a rotation sensor (not shown) that detects the rotation speed of the engine 1 and a signal 15a from a start switch 15 of the vehicle heating device are input to the control device 12.

Next, the operation of this embodiment will be described. When the starting signal 15a of the vehicle heating device is issued by the starting switch 15, the blower 9 is operated to start blowing air into the vehicle interior. Then, when the engine 1 is operating, the cooling water is pumped by the mechanical pump 1 a toward the heater core 8 and the radiator 5, and the cooling water discharged from the heater core 8 flows toward the electric pump 11. At this time, since the flow resistance of the bypass passage 13 is smaller than that of the electric flow through the electric pump 11, almost all of the cooling water discharged from the heater core 8 returns to the engine 1 through the bypass passage 13.

When it is determined that the engine 1 has stopped based on the signal 1b from the rotation sensor when the vehicle heating device is operating (see FIG. 2), the control device 12 causes the electric pump 11 to operate.
To work. Then, the discharge port 11b of the electric pump 11
Since the check valve 14 that closes the flow of the cooling water flowing from the side toward the suction port 11a is provided in the bypass passage 13, the cooling water discharged from the electric pump 11 is electrically driven through the bypass passage 13. The suction port 11a of the pump 11 flows into the engine 1 without returning. This allows the cooling water to continue to circulate between engine 1 and heater core 8.

Next, the features of this embodiment will be described. As described above, according to the present embodiment, the mechanical pump 1a is provided by a simple means such as providing the check valve 14 in the bypass passage 13.
When supplying the cooling water to the heater core 8 by
Both the case where the electric pump 11 is operated and the cooling water is supplied to the heater core 8 can be controlled. Therefore, it is possible to suppress an increase in the number of parts of the vehicle heating system, and since the engine is not remodeled significantly,
The capital investment described in the section "Problems to be solved by the invention" is not required. As a result, it is possible to suppress an increase in manufacturing cost of the vehicle heating device.

Further, since the check valve 14 is provided in the bypass passage 13, the cooling water circulates in the electric pump 11 and the bypass passage 13 when the engine is stopped by a simple means, that is, so-called cooling water. The shoot circuit condition can be prevented. Further, since the cooling water discharged from the heater core 8 flows back to the engine 1 through the bypass flow path 13 when the engine is operating, compared to the case where the cooling water passes through the electric pump and flows back to the engine when the engine is operating. Water resistance can be reduced.

Further, in this embodiment, the electric pump 11 is arranged on the downstream side of the heater core 8 in the cooling water flow.
The temperature and the pressure of the cooling water flowing into 1 decrease. Therefore, the durability of the electric pump 11 can be improved as compared with the case where the electric pump 11 is arranged on the upstream side of the cooling water flow. As a result, it is possible to suppress an increase in the manufacturing cost of the vehicle heating device.

(Second Embodiment) In this embodiment, the electric pump 11, the bypass passage 13 and the check valve 14 provided therein (the portion surrounded by the one-dot chain line in FIG. 1) are integrated. By doing so, the vehicle heating device is simplified. Hereinafter, this integrated one will be referred to as an electric pump device 1
Call 00.

FIG. 3 shows an electric pump device 1 according to this embodiment.
00 is an axial cross-sectional view, and 101 is a resin housing having excellent moldability such as nylon 66. The housing 101 has a suction port 102 for sucking cooling water and a discharge port for discharging cooling water. And 103 are formed. An electric pump mechanism 104 for generating a cooling water flow is arranged in the housing, and the electric pump mechanism 104 rotates by itself and thus the intake port 10 is rotated.
Impeller 1 for forming a pressure difference between the discharge port 103 and the discharge port 103
05 and a rotor 106 for rotating the impeller 105
And a motor unit 108 including a stator 107 and the like.

Further, the housing 101 is shown in FIGS.
As shown in FIG. 5, the suction passage 110 communicates with the suction port 102 from the space 109 in which the impeller 105 is arranged along the rotation axis direction of the impeller 105, and from the space 109 to the discharge port 103 in the radial direction of the impeller 105. The discharge flow channel 111 communicating with the bypass flow channel 1 branched from the suction flow channel 110 to bypass the space 109 and reach the discharge flow channel 111 communicating with the space 109.
And 12 are formed.

The suction channel 110 and the bypass channel 1
A valve body 114 made of aluminum for opening and closing an opening 113 that connects the flow passages 111 and 112 is arranged on the bypass flow passage 112 side of the branching portion with 12. 11
Reference numeral 5 is a coil spring that generates an elastic force, and 117 is a lid that closes an assembly hole 116 when the valve body 114 and the coil spring 115 are assembled.

The coil spring 115 is arranged between the lid 117 and the valve body 114, and causes the valve body 114 to exert an elastic force for pressing the valve body 114 against the opening 113. The lid 117 is sealed with an O-ring 118 so that the screw 1
It is fixed to the housing 101 at 19. In the present embodiment, as in the first embodiment, the electric pump device 1
The suction port 102 of 00 is connected to the discharge port 8a side of the heater core 8, and the discharge port 103 is connected to the cooling water inflow port 1b side of the engine 1.

Next, the operation of this embodiment will be described. When the engine 1 is in operation, the valve body 114 is opened by the fluid pressure (dynamic pressure) due to the flow of the cooling water as shown in FIG.
Since it moves so as to open 13, the cooling water flows through the bypass passage 112 and flows into the engine 1. In addition, when the engine is stopped, as shown in FIG.
Is operated, the cooling water sucked from the suction port 102 is
The engine 1 is discharged from the discharge port 103 through the space 109.
Flows into.

At this time, the valve body 114 is located in the bypass passage 1 of the branch portion of the intake passage 110 and the bypass passage 112.
Since it is arranged on the 12th side, the bypass passage 11
When a cooling water flow from 2 to the suction port 102 is generated, fluid pressure acts on the valve body 114 in a direction to close the opening 113. Therefore, the valve body 114 has the discharge port 1
It functions as a check valve mechanism that closes the flow of cooling water flowing from 03 to the suction port 102.

As described above, according to the present embodiment, the electric pump mechanism and the check valve mechanism are integrated, so that the assembling property to the vehicle heating device is improved. Therefore, it is possible to suppress an increase in the manufacturing cost of the vehicle heating device. (Third Embodiment) In the present embodiment, a heat retaining tank 16 for retaining cooling water and storing the cooling water is provided to extend the heating duration time after the engine is stopped.

That is, as shown in FIG. 7, the heat insulation tank 16 is arranged so that the flow of cooling water is parallel to the engine 1 and the heater core 8, and the electric pump 1 is also provided.
1, electric pump mechanism 104 and bypass flow paths 13, 1
12 is arranged between the heat insulation tank 16 and the heater core 8. In order to control the flow of cooling water in the heat retaining tank 16, the control device 12 is provided at a branch portion 17 between the flow of cooling water flowing in and out of the heat retaining tank 16 and the flow of cooling water circulating in the engine 1 and the heater core 8. This embodiment can also be implemented by disposing a three-way valve controlled by.

By the way, in the above-described embodiment, the electric pump 11, the bypass passage 13 and the electric pump device 100 are provided.
Is arranged on the downstream side of the cooling water flow of the heater core 8.
The present invention can be implemented by arranging the heater core 8 on the upstream side of the cooling water flow as shown in FIG. Further, in the third embodiment, the valve body 114 may be a resin spherical body, and the coil spring 115 may be omitted.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle heating device according to a first embodiment of the present invention.

FIG. 2 shows a vehicle heating device according to the first embodiment,
It is explanatory drawing for demonstrating the cooling water flow at the time of engine stop.

FIG. 3 is a sectional view of an electric pump device according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a cross-sectional view showing a state in which the valve body is open in the AA cross section of FIG.

FIG. 7 is a schematic diagram of a vehicle heating device according to a third embodiment of the present invention.

FIG. 8 is a schematic diagram of a vehicle heating device showing a modified example of the present invention.

[Explanation of symbols]

1 ... Water-cooled engine, 1a ... Mechanical pump, 2 ... Motor,
3 ... Battery, 4 ... Capacitor, 5 ... Radiator, 6 ...
Bypass circuit, 7 ... Thermostat, 8 ... Heater core,
9 ... Blower, 10 ... Air conditioning casing, 11 ... Electric pump (electric pump mechanism), 12 ... Control device, 13 ... Bypass flow path, 14 ... Check valve (check valve mechanism), 100 ... Electric pump device, 101 ... Housing, 102 ... Intake port, 103
... Discharge port, 104 ... Electric pump mechanism, 105 ... Impeller, 106 ... Rotor, 107 ... Stator, 108 ... Motor part, 109 ... Space, 110 ... Suction flow path, 111 ... Discharge flow path, 112 ... Bypass flow path , 113 ... Aperture, 114 ...
Valve body, 115 ... Coil spring, 116 ... Assembly hole, 11
7 ... Lid, 118 ... O-ring, 119 ... Screw.

Claims (3)

[Claims] 1. A water-cooled engine (1), a battery (3) for storing electric power generated by the driving force of the water-cooled engine (1), a water-cooled engine (1) built in the water-cooled engine (1), ) Is applied to a vehicle having a mechanical pump (1a) that circulates cooling water by obtaining driving force from the heater core (8) that heats the air blown into the vehicle compartment using the cooling water as a heat source, and the water-cooled engine (1). ) And the heater core (8) are connected to each other, and an electric pump mechanism (11, 104) provided in a flow path of cooling water and driven by obtaining electric power from the battery (3) when the water cooling engine (1) is stopped. A heating device for a vehicle, which is capable of heating even when the water-cooled engine (1) is stopped, bypasses the electric pump mechanism (11, 104), and introduces a suction port () of the electric pump mechanism (11, 104). 1 1a, 10
2) side and the discharge port (11b, 103) side communicate with the bypass flow path (13, 112) and the bypass flow path (13, 112), and the discharge of the electric pump mechanism (11, 104). Exit (11b, 10
Check valve mechanism (14, 114) that closes the flow of cooling water flowing from the 2) side toward the suction port (11a, 103) side
A heating system for a vehicle, comprising: 2. The bypass flow passage (112) and the check valve mechanism (14, 114) are provided in a housing (101) that houses the electric pump mechanism (104). The vehicle heating device according to claim 1. 3. A vehicle heating device having a heater core (8) for heating the air blown into the passenger compartment by using the cooling water of the water-cooled engine (1) as a heat source and capable of heating even when the water-cooled engine (1) is stopped. An electric pump device for heating a vehicle, which is adapted to circulate cooling water in the heater core (8) when the water cooling engine (1) is stopped, the intake port (102) for sucking the cooling water and the discharge port for discharging the cooling water. Housing (101) with outlet (103) formed
And an electric pump mechanism (10) housed in the housing (101) and generating a cooling water flow by forming a pressure difference between the suction port (102) and the discharge port (103).
4) and a bypass flow passage (112) formed in the housing (101) and bypassing the electric pump mechanism (104) to connect the suction port (102) side and the discharge port (103) side. And a check valve mechanism (114) which is provided in the bypass flow passage (112) and closes a cooling water flow flowing from the discharge port (103) side to the suction port (102) side. An electric pump device for vehicle heating.