JPH11117744A - Water cooling type cooling device for hybrid electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily extract air of a cooling circuit. SOLUTION: In a hybrid electric vehicle provided with a cooling circuit 22 for cooling a generator 3, an inverter 7, motors 5, 6 for traveling, and auxiliaries such as an air compressor 13 and an air conditioner unit 14 with cooling water circulated by a water pump 24, a sub-tank 25 to store stand-by cooling water is connected to the cooling circuit 22, and an air piping 28 for introducing compressed air from an compressed air source is connected to an air vent hole 26 of the sub-tank 25 via a valve means 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled cooling device for cooling a generator, an inverter, a traveling motor and accessories of a hybrid electric vehicle.

[0002]

2. Description of the Related Art Conventionally, there is a hybrid electric vehicle in which an engine and an electric motor are combined to improve exhaust emission.

[0003] Such a hybrid electric vehicle includes a generator driven by an engine, and a battery for storing the generated power, and uses the power as a power source to drive a driving motor through an inverter to travel.

[0004]

In such a hybrid electric vehicle, in addition to the engine, the temperature of auxiliary equipment such as a generator, an inverter, an electric motor for traveling, and an air compressor and an air conditioner unit is properly maintained. It is necessary to provide a cooling circuit for cooling these generators, inverters, electric motors for traveling, and accessories with cooling water.

[0005] However, when a cooling circuit for cooling a large number of devices is provided, the circuit becomes complicated, and it becomes difficult to release air from an air pool formed in each device.

[0006] This air bleeding is performed when the cooling water in the cooling circuit is filled (for maintenance, etc.). If air remains in the circuit, the cooling performance is reduced and cooling is hindered.

In this case, providing an air bleeding valve or the like in each device requires time and labor for bleeding air, and depending on the installation position of each device, the air bleeding operation cannot be performed easily.

[0008] Japanese Patent Application Laid-Open No. Hei 8-93471, 9-49
In Japanese Patent Publication No. 430, the cooling water of an engine cooling circuit is stored in a warmer in order to promote warming-up of the engine.

It is an object of the present invention to provide a water-cooled cooling device for a hybrid electric vehicle that can solve such problems.

[0010]

According to a first aspect of the present invention, there is provided a generator driven by an engine, a battery, and a traveling motor driven by an inverter using the battery as a power source. In a hybrid electric vehicle having a cooling circuit that cools auxiliary equipment such as a traveling motor and an air compressor and an air conditioner unit with cooling water circulated by a water pump, a sub-tank that stores spare cooling water is connected to the cooling circuit, An air pipe for introducing compressed air from a compressed air source is connected to the air vent hole of the sub tank via a valve means.

According to a second aspect of the present invention, in the first aspect, the water pump in the cooling circuit is driven by driving a water pump in the cooling circuit and introducing pressure into the air vent hole of the sub-tank to increase the pressure in the cooling circuit. Vent the air.

In a third aspect based on the first aspect, the water pump and the valve means are electrically driven.

[0013]

According to the first to third aspects of the present invention, when the water pump is driven by introducing compressed air into the sub-tank at the time of maintenance such as filling the cooling circuit with cooling water, the generator, the inverter, and the traveling motor are driven. Then, the volume of air in the air pool of each device of the auxiliary equipment is reduced, and the air is sent to the sub tank by the water flow circulated by the water pump and discharged.

Therefore, the air in the cooling circuit can be easily and reliably removed, and the cooling performance can be sufficiently exhibited, and the maintainability is improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a power room 1 provided at the rear of a vehicle such as a bus. Reference numeral 2 denotes an engine, 3 denotes a generator driven by the engine 2, and 4 denotes a battery for storing electric power generated by the generator 3. , 5 and 6 are running motors driven by a generator 3 and a battery 4 via an inverter 7.

Partition walls are formed at the front (upper side), upper part, etc. of the power room 1. The left and right sides are provided on the outer wall panel 8 of the vehicle, and the rear side (rear side of the vehicle) is provided with an opening / closing door for inspection. Surrounded by the rear panel of the vehicle.

The engine 2 is arranged horizontally on the left side of the power room 1 (left side of the vehicle) in the figure, and the generator 3 is directly connected to the engine 2. 9 is an air cleaner. The electric motors 5 and 6 are attached to the transmission 10 on the right side of the power room 1 (right side of the vehicle), and the driving force is transmitted from the drive shaft and the differential device to the driving wheels via the transmission 10.

The inverter 7 is arranged in the inverter room 11 in the middle part of the power room 1 on the right side of the figure (right side of the vehicle), and the battery 4 is arranged in the battery room 12 above the inverter room 11.

The generator 3, the motors 5, 6 and the inverter room 1
Auxiliary equipment such as an air compressor 13, an air conditioner unit 14, and a radiator 20 are arranged between the control unit 1 and the control unit 1. The radiator 20 is assembled with the electric fan 21 as shown in FIGS. 2 and 3, is unitized, and is disposed near the air conditioner unit 14 (on the rear side of the vehicle).

A heat shield plate 15 is provided between the engine 2 and the generator 3 so that hot air around the engine 2 does not flow into the vicinity of the generator 3. The heat shield plate 15 includes an engine room 16 and a generator room 17 from the front to the rear of the power room 1.
And the engine room 16 is extended to the upper part of the power room 1 so as to also define the inverter room 11 and the battery room 12.

As shown in FIG. 4, a cooling circuit 22 is provided for cooling auxiliary equipment such as the generator 3, the electric motors 5, 6, the inverter 7, the air compressor 13, and the air conditioner unit 14 with cooling water.

As the cooling circuit 22, a radiator 20 and a generator 3, an electric motor 5,
6. Inverters 7 and cooling jackets formed on auxiliary equipment such as the air compressor 13 and the air conditioner unit 14 are connected.

In this case, the auxiliary equipment such as the generator 3, the electric motors 5, 6, the inverter 7, the air compressor 13 and the air conditioner unit 14 are connected in parallel for each predetermined system, and the cooling water inlet side and the radiator 20 are connected. An electric water pump 24 is interposed in a pipe 23 between the two.

A sub-tank 25 for storing spare cooling water is connected to a pipe 23 on the inlet side connected to the upper tank portion of the radiator 20.

An air pipe 28 for introducing compressed air from an air reservoir 27 is connected to an air vent hole 26 provided in the upper part of the sub tank 25.
A three-way solenoid valve 29 is interposed midway.

A drive circuit 30 for the three-way solenoid valve 29 is provided. When the three-way solenoid valve 29 is in the OFF state, the air vent hole 26 of the sub-tank 25 is opened to the atmosphere. When the solenoid valve 29 is turned on, air of a predetermined pressure is supplied from the air reservoir 27 to the sub tank 2.
5 is introduced.

The air reservoir 27 is supplied with a predetermined pressure from a pressure source (such as the air compressor 13).

In such a configuration, when filling the cooling circuit 22 with cooling water at the time of initial setting or maintenance, the water supply port of the sub tank 25 is opened, and the cooling water is injected until the sub tank 25 is almost full. And close the water inlet.

Next, the air release switch 3 of the drive circuit 30
By turning on 1, the three-way solenoid valve 29 is turned on to introduce a predetermined pressure from the air reservoir 27 into the sub-tank 25 and to drive the electric water pump 24 of the cooling circuit 22.

Then, the compressed air introduced into the sub-tank 25 causes the air in the air pool of each of the auxiliary equipment such as the generator 3, the electric motors 5, 6, the inverter 7, the air compressor 13, and the air conditioner unit 14 to generate air in FIG. And the volume is reduced as described above, so that air can easily get on the water flow circulated through the cooling circuit 22 by the electric water pump 24, and is sent to the position of the sub tank 25 by the circulated water flow, Released into the air space.

Thereafter, the electric water pump 24 is stopped, the three-way solenoid valve 29 is turned off by turning off the air release switch 31, the sub-tank 25 is opened to the atmosphere, and cooling water is again injected into the sub-tank 25. The three-way solenoid valve 29 is also turned on by turning on the air release switch 31.
Is turned on, air of a predetermined pressure is introduced from the air reservoir 27 into the sub tank 25, and the electric water pump 24
Drive.

By repeating these steps several times, the air in the cooling circuit 22, including each device, is completely removed.

After the air has been removed, the water injection is terminated so that about half of the sub tank 25 is filled with the cooling water.

As described above, the air in the cooling circuit 22 can be easily and reliably removed. Therefore, the cooling performance can be sufficiently exhibited, and the maintainability is improved.

The sub-tank 25 receives the expanded cooling water from the cooling circuit 22 during operation, returns the received cooling water when the cooling water temperature falls, or supplies the cooling circuit 22 with the cooling water. Do.

[Brief description of the drawings]

FIG. 1 is an arrangement configuration diagram showing an embodiment.

FIG. 2 is a layout view of a radiator as viewed from the rear of the vehicle.

FIG. 3 is a layout view of a radiator viewed from a side of the vehicle.

FIG. 4 is a configuration diagram of a cooling circuit unit.

FIG. 5 is an operation explanatory view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power room 2 Engine 3 Generator 4 Battery 5, 6 Electric motor 7 Inverter 11 Inverter room 12 Battery room 13 Air compressor 14 Air conditioner unit 20 Radiator 21 Electric fan 22 Cooling circuit 23 Piping 24 Electric water pump 25 Subtank 26 Air vent hole 27 Air reservoir 28 Air piping 29 Three-way solenoid valve 30 Drive circuit 31 Air release switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 29/02 F02D 29/02 D (72) Inventor Yuji Kusahara Nissan Diesel Kogyo Co., Ltd. (72) Inventor Toshihiko Abe Nissan Diesel Industry Co., Ltd.

Claims (3)

[Claims] 1. A generator driven by an engine, a battery, and a traveling motor driven by an inverter using the battery as a power source. The generator, the inverter, the traveling motor, the air compressor, and the air conditioner unit. In a hybrid electric vehicle provided with a cooling circuit that cools auxiliary equipment such as by cooling water circulated by a water pump, a sub-tank for storing spare cooling water is connected to the cooling circuit,
A water-cooled cooling device for a hybrid electric vehicle, wherein an air pipe for introducing compressed air from a compressed air source is connected to an air vent hole of the sub-tank via a valve means. 2. The air pump in the cooling circuit is driven by driving a water pump in the cooling circuit and by introducing pressure air into an air vent hole in the sub-tank to increase the pressure in the cooling circuit. A water-cooled cooling device for a hybrid electric vehicle according to Claim 1. 3. The water-cooled cooling device for a hybrid electric vehicle according to claim 1, wherein the water pump and the valve means are electrically driven.