JPH05104945A - Vehicle with cooling device - Google Patents

Abstract

PURPOSE:To obviate the large installation space of cooling devices with extremely small cooling engine load without increasing the weight of a vehicle and make the effective use of cold air generated at the heat exchanger of a gas engine. CONSTITUTION:The vehicle 10 is provided with a fuel tank 22 stored with low temperature liquefied gas 23 and covered with an insulating layer 22a: liquefied gas delivery means 26, 27 for delivering the liquefied gas from the fuel tank 22 with high pressure; a heat exchanger for bringing the liquefied gas, delivered from the delivery means 26, 27, into contact with a specified medium so as to gasify this liquefied gas into high pressure gas; and a gas engine 16 fueled with this high pressure gas having passed the heat exchanger. This vehicle 10 is further provided with cooling devices 12, 14, 19 with the specified medium of the heat exchanger as refrigerant, and these cooling devices 12, 14, 19 are used for cooling the vehicle interior, refrigeration, and cooling intake air, and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle equipped with a gas engine which uses a low temperature liquefied gas such as liquid hydrogen, liquefied natural gas or liquefied petroleum gas as a fuel. More specifically, it relates to a vehicle in which a heat exchanger for vaporizing low-temperature liquefied gas into high-pressure gas is used as a cooling device.

[0002]

2. Description of the Related Art This type of gas engine, for example, a hydrogen gas engine, does not emit harmful gases such as carbon monoxide and hydrocarbons to the human body during hydrogen combustion, so that it has a characteristic of clean exhaust and high output. .. In this hydrogen gas engine, liquid hydrogen in a fuel tank is vaporized into high-pressure hydrogen gas by a heat exchanger, and then this hydrogen gas is injected into a cylinder of the engine for combustion. Until now, air was used as a medium for vaporizing liquid hydrogen into hydrogen gas in a heat exchanger, and the air that became cold during vaporization was warmed by the atmosphere surrounding the heat exchanger and repeatedly used for vaporizing liquid hydrogen. .. On the other hand, in a conventional refrigeration system for a refrigerating vehicle or a vehicle with a car cooler, a compressor attached to an engine is rotated to compress a gas as a refrigerant into a high-temperature and high-pressure gas, which is then condensed by a condenser into a high-pressure and high-temperature liquid. After that, the refrigerant is rapidly expanded into a low-temperature low-pressure liquid, which is vaporized by an evaporator to remove heat from the surrounding air, thereby cooling the freezer and the passenger compartment.

[0003]

Therefore, in a conventional refrigerating vehicle or vehicle with a car cooler, the engine load for rotating the compressor is large, and the compressor, the condenser,
The weight of the vehicle increased due to the evaporator and the like, and more space was required for installing these. In hydrogen gas engine vehicles, cold air was diffused into the atmosphere and was not used effectively. An object of the present invention is to provide a vehicle with a cooling device in which the engine load for cooling is extremely small, the weight of the vehicle is not increased, and the installation space for the cooling device is small. Another object of the present invention is to provide a vehicle with a cooling device that effectively uses cold air generated in a heat exchanger of a gas engine.

[0004]

A structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention relates to a fuel tank 22 which is surrounded by a heat insulating layer 22a and stores a low temperature liquefied gas 23, and liquefied gas delivery means 26, 2 for delivering the liquefied gas from the fuel tank 22 at a high pressure.
7, a heat exchanger that vaporizes the liquefied gas delivered from the delivery means 26, 27 into a high-pressure gas by contacting it with a predetermined medium, and a gas engine 16 that uses the high-pressure gas that has passed through the heat exchanger as fuel. It is an improvement of the vehicle 10 including the. The characteristic configuration is that the vehicle 10 is provided with cooling devices 12, 14, and 19 using a predetermined medium of the heat exchanger as a refrigerant.

[0005]

The liquefied gas delivered from the fuel tank 22 by the delivery means 26, 27 comes into contact with a predetermined medium in the heat exchangers 12, 14, 19 to be vaporized. The medium is cooled by the vaporization, and this medium becomes a refrigerant, and the heat exchangers 12, 14, 1
A cooling device 9 cools a desired portion of the vehicle.

[0006]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the vehicle 10 is a refrigerating vehicle, and a cab 11 is provided with a heat exchanger 12 for cooling the vehicle compartment. A freezing heat exchanger 14 is provided in the freezer 13. In this example, a hydrogen gas engine 16 is mounted on a chassis frame (not shown) below the cab 11. The engine 16 is an engine with a supercharger, and an intake air passage 18 between the supercharger 17 and the engine 16 is provided with an intake air cooling heat exchanger 19 which is an intercooler. A radiator 21 that cools the cooling water of the engine 16 is provided on the back surface of the heat exchanger 19.

A fuel tank 22 is attached to a chassis frame (not shown) below the freezer 14. This tank 22 is covered with a heat insulating layer 22a in which a vacuum is applied between outer panels made of stainless steel, and stores liquid hydrogen 23 at −253 ° C. Reference numeral 24 is a liquid hydrogen supply port. Inside the tank 22, a pump unit 26 that delivers liquid hydrogen at high pressure from the tank is provided, and outside the tank 22, a drive unit 27 that drives this unit 26 is provided. A heat insulating pipe 28 is piped from the pump unit 26 and connected to the inlet port of the check valve 29.

A main pipe 31, an auxiliary pipes 32 and 33 having a heat insulating structure are connected to the outlet port of the valve 29. The main pipe 31 is connected to the surge tank 34 via the freezing heat exchanger 14. The heat exchanger 14 has a meandering pipe 14a surrounded by a cool storage agent 14b. The cold storage agent 14b acts as a refrigerant of the cooling device of the freezer 13. A fan 14 is provided on the cab side of the heat exchanger 14 so that the cold air diffused from the heat exchanger 14 is distributed to the entire freezer 13.
c is arranged. The high-pressure hydrogen stored in the surge tank 34 is guided to the gas injection device 37 via the connection pipe 36. The gas injection device 37 includes a gas injection valve 37a for each cylinder.
(FIG. 2). The auxiliary pipe 32 has a normally closed solenoid valve 3
2a, and the auxiliary pipe 33 is provided with a normally closed solenoid valve 33a. The auxiliary pipes 32 and 33 are connected to the intake manifold 38 of the engine 16 via the vehicle interior cooling heat exchanger 12 and the intake air cooling heat exchanger 19, respectively.
In these heat exchangers 12 and 19, air comes into contact with a pipe through which liquid hydrogen flows to vaporize the liquid hydrogen, and the contacted air serves as a refrigerant.

Reference numeral 40 denotes a controller, which has a control input to which an engine rotation sensor 41, a load sensor 42, and a pressure sensor 43 of the surge tank 34 are connected, and further, a room temperature sensor 44 provided in the cab 11, an intake air An intake air temperature sensor 38a provided in the manifold 38, a hydrogen gas temperature sensor 45 (FIG. 2) sent to the gas injection valve 37a, and a freezer temperature sensor 46 provided in the freezer 13 are connected. The control output of the controller 40 is connected to the drive unit 27, the gas injection electromagnetic coil 47, the spark plug 48 (FIG. 2), the fans 12c and 14c, and the electromagnetic valves 32a and 33a. The fan 12c is provided behind the heat exchanger 12 for vehicle compartment cooling.

The operation of the apparatus having such a configuration will be described.
When the engine 16 is started by a starter (not shown),
The controller 40 drives the pump unit 26 by controlling the drive unit 27 based on the detection outputs of the engine rotation sensor 41 and the load sensor 42, and the surge tank pressure sensor 43. As a result, the liquid hydrogen 23 passes through the valve 29 and the main pipe 31, the auxiliary pipes 32 and 3
3 is supplied. Most of the liquid hydrogen supplied to the main pipe 31 enters the heat exchanger 14 and cools the regenerator 14b.
Since the temperature of the liquid hydrogen is much lower than the temperature of the air in the freezer 13, the heat of the air is removed to vaporize the liquid hydrogen and cool the freezer 13, and then become high-pressure hydrogen gas and enter the surge tank 34. Be stored. The controller 40 rotates the fan 14c according to the detection outputs of the temperature sensor 46 and the pressure sensor 43 of the freezer 13, or the driving status of the drive unit 27. Regenerator 14b of heat exchanger 14
As a result, the inside of the freezer is stably cooled even if liquid hydrogen does not flow to the pipe 14a due to engine stop or the like.

The high-pressure hydrogen gas stored in the surge tank 34 is supplied to the gas injection device 37, and the controller 40
The electromagnetic coil 47 for gas injection and the spark plug 48
Is driven, combustion occurs in the cylinder, and the rotation speed of the engine 16 increases. Further, the controller 40 opens the electromagnetic valve 32a and drives the fan 12c when the room temperature is higher than a predetermined temperature based on the detection output of the room temperature sensor 44. As a result, cool air is released from the heat exchanger 12 into the vehicle. Further, the controller 40 opens the solenoid valve 33a when the intake air temperature is higher than a predetermined temperature based on the detection output of the intake air temperature sensor 38a. As a result, in the heat exchanger 19, the air obtained by vaporizing the liquid hydrogen becomes a refrigerant to cool the intake air heated by the supercharger 17.

In the above example, a vehicle equipped with a hydrogen gas engine was explained, but the gas engine of the present invention is not limited to liquid hydrogen, but is a gas that uses liquefied natural gas, liquefied petroleum gas or other low-temperature liquefied gas as a fuel. It can also be applied to vehicles equipped with an engine.

As described above, according to the present invention, the conventional compressor or the like is unnecessary, the engine load for cooling is extremely small, and the vehicle weight is not increased.
There is an advantage that the installation space of the cooling device is small. Further, the cold air generated in the heat exchanger of the gas engine can be effectively used.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle with a cooling device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the hydrogen gas engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 vehicle 12 heat exchanger (cooling device) for vehicle compartment cooling 14 heat exchanger (cooling device) for refrigeration 19 heat exchanger (cooling device) for cooling intake air 16 gas engine 22 fuel tank 22a heat insulating layer 26 pump unit (liquefaction) Gas delivery means) 27 Drive unit (liquefied gas delivery means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location F02M 21/06 B 7114-3G F25D 3/10 D 7409-3L (72) Inventor Seiji Hikino Tokyo Hino City 3-1, 1-1 Hino Motor Co., Ltd. (72) Inventor Kiyoyuki Furuuchi 3-1-1 Hinodai, Hino City, Tokyo Hino Motor Co., Ltd.

Claims (4)

[Claims] 1. A low temperature liquefied gas (2) which is covered with a heat insulating layer (22a).
Fuel tank (22) for storing 3) and liquefied gas delivery means (26, 27) for delivering liquefied gas from the fuel tank (22) at high pressure
And a heat exchanger for contacting the liquefied gas delivered from the delivery means (26, 27) with a predetermined medium to vaporize it into a high-pressure gas,
In a vehicle equipped with a gas engine (16) that uses the high-pressure gas that has passed through the heat exchanger as a fuel, a cooling device (12, 1) that uses a predetermined medium of the heat exchanger as a refrigerant.
A vehicle with a cooling device, which is provided with 4,19). 2. A heat exchanger (12) is provided in the passenger compartment (11),
The vehicle with a cooling device according to claim 1, wherein the vehicle compartment (11) is cooled by a predetermined medium of the heat exchanger (12). 3. The gas engine (16) is a supercharged engine, and the heat exchanger (19) is the supercharger (17) and the engine.
The heat exchanger (1) is provided in the intake air passage (18) between (16).
The vehicle with a cooling device according to claim 1, wherein the intake air is cooled by the predetermined medium of 9). 4. The vehicle is a refrigeration vehicle (10), the heat exchanger (1
The vehicle with a cooling device according to claim 1, wherein 4) is provided in the freezer (13) and is configured to cool the freezer (13) by a predetermined medium (14b) of the heat exchanger (14).