JP2003320839A - Automobile heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automobile heating device in which a fuel feeding device satisfying a safety standard over the life can be realized at a low cost. <P>SOLUTION: The heating device 10 is provided with a burner. A fuel can be fed from a reservoir 18 to the burner by a fuel feed device 42 and can be further fed from the reservoir 18 to an internal combustion engine 22 of the automobile through a delivery pipe 30 by a fuel pump 24 of the automobile. The fuel feed device 42 can be connected to the delivery pipe 30 and is formed such that it feeds the fuel by a fuel feed pump 24 of the automobile during parking heating operation and/or auxiliary heating operation. A pressure reducing valve 44 is arranged in the fuel feed device 42. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine of an automobile, in which fuel can be supplied from a reservoir or a vehicle tank to a burner by a fuel supply device, and the fuel is supplied from the reservoir or the vehicle tank to a discharge pipe by an automobile fuel pump. The fuel supply device is connectable to the discharge pipe, and is configured to supply fuel by the fuel supply pump of the vehicle during parking heating operation (independent heating operation) and / or auxiliary heating operation. Related to heating systems for automobiles. The invention further comprises a reservoir,
The present invention relates to an automobile in which fuel can be supplied to an internal combustion engine from a fuel pump through a discharge pipe by a fuel pump, and the above-described automobile heating device is integrated.

[0002]

2. Description of the Related Art A vehicle heating system of the above type is used as an air heating system or a water heating system in a vehicle such as a passenger car, a commercial vehicle, a bus or a ship. The heating device normally serves to preheat the cooling water of the internal combustion engine to warm the passenger compartment or during parking heating operation or auxiliary heating. Parking heating operation means that the internal combustion engine of the motor vehicle is not operated in this operating state and therefore heat cannot be discharged from the internal combustion engine. In the auxiliary heating operation, thermal energy is additionally supplied by the vehicle heating device during operation of the internal combustion engine. Thereby, for example, the cooling water of the passenger compartment of the automobile or the internal combustion engine can be heated in a short time.

In today's automobiles, internal combustion engines with optimized fuel consumption are used. This internal combustion engine emits relatively little heat. In the case of such vehicles, it is becoming increasingly important to be able to supply additional heat energy by means of the vehicle heating system as required. The heating system should be manufacturable and operable at low cost.

In a conventional automobile heating system, fuel is sucked from a tank or a reservoir through a fuel pipe by a fuel metering pump and supplied to a burner of the heating system. Such a heating device is known (see, for example, Patent Document 1).

An automobile heating system independent of an engine is known (see, for example, Patent Document 2). In the case of this heating device, for example, a vehicle-specific fuel pump of the injection device of the injection internal combustion engine or an engine fuel pump is used to supply the burner of the heating device with a fuel flow rate under a preload (for example, 0.5 MPa). It The fuel is controlled by the heating control device while the engine is stopped.

In such a heating device, it is known to dispose an accumulator in the fuel pipe before the fuel metering device (see, for example, Patent Document 3). in this case,
The fuel pump must be operated temporarily when the engine is stopped. In front of the accumulator in the direction of flow, a check valve is arranged in the fuel line which opens towards the accumulator. This check valve ensures that the pressure in the accumulator never drops, even if there is a leak in the fuel pump.

[0007]

[Patent Document 1] German Patent Application Publication No. 19545677

[0008]

[Patent Document 2] WO96 / 06305

[0009]

[Patent Document 3] German Patent Application Publication No. 19619861

[0010]

SUMMARY OF THE INVENTION The problem underlying the present invention comprises a heating device as mentioned at the outset, in which a fuel supply device, which can be realized at low cost, fulfills safety standards and functions reliably over its lifetime. It is to provide a car.

[0011]

According to the invention, this object is achieved in an automotive heating system of the type mentioned at the outset by the provision of a pressure reducing valve in the fuel supply system. The problem is further solved by an automobile having a reservoir from which fuel can be supplied to an internal combustion engine via a discharge pipe by a fuel pump and in which the automobile heating device according to the present invention is integrated.

In the case of the heating device according to the present invention, the pressure of the fuel supplied to the heating device is reduced by a simple pressure reducing valve. The pressure reducing valve prevents dangerously high pressures from acting on the heating device. This high pressure is not necessary for operating the heating system.

Unlike known heating systems in which fuel is supplied from the discharge pipe of an internal combustion engine, the present invention limits the fuel pressure supplied to the heating system. This limit can be set to a predetermined pressure and pressure or can be adjusted to different heights and pressures by means of an adjustable pressure reducing valve. The various adjustments and pressure adjustments can be made manually during the production of the heating system and during maintenance work for different types of heating systems, motor vehicles or internal combustion engines, or can be controlled externally, for example by means of electromagnetic pressure reducing valves. Or remotely controlled. The pressure reducing valve can then be controlled by the control of the heating device or its function can be monitored.

The pressure reducing valve according to the present invention may further include a metering valve that can be opened and closed so that it can be used in a heating device.
This has the advantage that the heating system and pressure can be determined. In this case, it is not necessary to operate the metering valve intermittently, as is the case with known metering valves or devices.

It is also possible that the metering valve for the combustion operation of the heating device need only be opened first and closed at the end. This function can possibly also be ensured by valves which are not externally controllable, for example relief valves.

In a preferred embodiment of the heating system for motor vehicles according to the invention, the fuel supply device comprises a metering valve, by means of which the pressure in the discharge pipe can be used to allocate fuel to the burner. The metering valve can advantageously be combined with the pressure reducing valve according to the invention, as described above. The metering valve can be formed as a solenoid valve at low cost.

The fuel supply device for the vehicle heating system according to the present invention comprises a fuel storage container and / or a damper. This storage container or damper serves to smooth out pressure changes in the fuel supply system and, in some cases, to relatively shorten individual phases of fuel pump operation.

The pressure reducing valve according to the invention is preferably arranged in the flow direction before the metering valve and / or before the damper or the storage container. Thereby, the metering valve and the damper or the storage container are isolated against the high pressure in the discharge pipe of the internal combustion engine. This is an important safety feature of the heating device according to the invention.

The fuel supply system of the motor vehicle heating system according to the invention is preferably limited by a control device, which is in particular adapted to control the metering valve and the pressure in the discharge pipe.

The control device is therefore operatively connected to the fuel pump and is able to control the fuel pump, especially when the internal combustion engine is not operating. Since this control can be performed intermittently, the consumption of electric energy by the fuel pump can be minimized.

In order to form a control circuit consisting of the fuel pump and / or the metering valve and the pressure reducing valve according to the invention, a pressure sensor is arranged in the fuel supply device, in particular in the flow direction before the metering valve. And is advantageous. The pressure sensor is connected to the control device. The control time is stored as a characteristic map in the memory unit of the control device in order to uniformly regulate the desired fuel quantity for the engine.

The signals of the volume flow sensor and / or the mass flow sensor (eg calorimetric sensor) additionally or alternatively serve as the input signal of the control circuit. This sensor is preferably arranged in the fuel supply system.

In the case of an intermittently operated metering valve, it is advantageous if the throttle is arranged in the fuel supply device, especially in the flow direction and before the metering valve. This throttle smoothes the pressure changes and dampens the flow carried by the fuel pump.

In the case of a motor vehicle according to the invention, the control device of the heating system and the fuel pump of the motor vehicle are connected to the data bus, in particular CAN.
It is advantageous if they are connected via a bus. The control device controls the fuel supply of the heating device by the fuel pump of the vehicle, especially when the internal combustion engine is not operated. Alternatively, the controller of the heating system and the fuel pump of the motor vehicle can be directly connected or controlled.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a heating system for an automobile according to the present invention will be described in detail with reference to the attached schematic diagram.

FIG. 1 shows a conventional vehicle heating system 10 having a fuel supply system 12. This heating device 10
In the case of, a burner (not shown) placed in it
Fuel is supplied.

The fuel supply device 12 includes a suction pipe 14. A fuel pump 16 of the heating device 10 sucks fuel from a tank or a reservoir 18 through the suction pipe 14. The fuel pump 16 conveys the fuel to the discharge pipe 20 while slightly increasing the pressure and adjusting the amount. The discharge pipe 20 is connected to the burner of the heating device 10. In this burner, metered fuel flows out from a spray nozzle (not shown). Such a heating device 10 shown in FIG. 1 is known, for example, from the above-mentioned Patent Document 1.

FIG. 2 shows an automotive heating system 10 according to the invention. This heating device 10 is integrated in an automobile having an internal combustion engine 22 in the form of a combustion engine.

Liquid fuel is supplied to the combustion engine 22 from a tank or reservoir 18 by a vehicle fuel pump 24. The fuel pump 24 is also called an electric engine fuel pump (EKP). The fuel pump 24 conveys fuel to the discharge pipe 30 via the pressure regulator 26 and the check valve 28. The discharge pipe 30 is connected to a fuel injection device 34 of the internal combustion engine 22. The fuel injection device 34 includes components (not shown) such as a high pressure pump and a pressure sensor. The pressure regulator 26 regulates the pressure in the discharge pipe 30 according to the demand of the fuel injection device 34.

The internal combustion engine 22 is operatively connected to an engine controller 38 via a signal line 36. The engine control device 38 is connected to the fuel pump 24 via a signal line 40.

Behind the check valve 28 in the flow direction, the supply pipe 42 of the fuel supply device of the heating device 10 is connected to the discharge pipe 30. A pressure reducing valve 44 integrated with the heating device 10 is arranged in the supply pipe 42. This pressure reducing valve 44
Reduces the pressure from the discharge pipe 30 to the pressure for operating the heating device 10.

A check valve 46 and a pressure sensor 48 are arranged in the supply pipe 42 behind the pressure reducing valve 44 in the flow direction. The supply pipe 42 can be closed by a metering valve 50 whose end is electrically operable. The metering valve 50 is arranged in the immediate vicinity of a burner (not shown) of the heating device.

The pressure sensor 48 and the metering valve 50 are connected to the control device 56 of the heating device via signal lines 52 and 54. The controller 56 itself is operatively connected to the fuel pump 24 via signal line 58.

The controller 56 controls the fuel pump 24 of the automobile.
And a metering valve 50 to supply the required amount of fuel to the heating device 10
It is installed to assign to the burner of. The maximum and pressure of this fuel is limited by the pressure reducing valve 44.

[Brief description of drawings]

1 is a basic layout of a heating device according to the state of the art installed in a vehicle.

2 is a basic layout of a heating device according to the invention integrated in a motor vehicle. FIG.

[Explanation of symbols]

10 ... Heating device, 12 ... Fuel supply device, 14 ... Suction pipe, 16 ... Heating device fuel pump, 18 ... Tank or reservoir, 20 ... Discharge pipe, 22 ... Internal combustion engine, 24 ... Automotive fuel pump, 26 ... Pressure Regulator, 28 ... Check valve, 3
0 ... Discharge pipe, 32 ... Check valve, 34 ... Fuel injection device, 36
... Signal line, 38 ... Engine control device, 40 ... Signal line, 42 ... Supply pipe, 44 ... Pressure reducing valve, 46 ... Check valve, 4
8 ... Pressure sensor, 50 ... Metering valve, 52 ... Signal line, 5
4 ... Signal line, 56 ... Control device, 58 ... Signal line

Continued front page    (72) Inventor Marx Renner             Germany, 85521 Reaming,             Carl-Zeiss-Strasse 19

Claims (11)

[Claims] 1. Fuel can be supplied from a reservoir (18) to a burner by means of a fuel supply device (12, 42), and further fuel can be supplied from the reservoir by means of a fuel pump (24) of the motor vehicle via a discharge pipe (30) of the motor vehicle. It can be supplied to the internal combustion engine (22), and the fuel supply device (42) is connected to the discharge pipe (3
0) and is connected to the vehicle fuel supply pump (2) during parking heating operation and / or auxiliary heating operation.
4) A vehicle heating system (10) configured to supply fuel by a fuel supply system (4).
A heating system for an automobile, characterized in that a pressure reducing valve (44) is arranged in 2). 2. The fuel supply device (42) comprises a metering valve (50).
2. The vehicle heating system according to claim 1, further comprising: a fuel supply valve, wherein fuel can be assigned to the burner by using the pressure in the discharge pipe (30). 3. Heating system according to claim 1, characterized in that the fuel supply device (42) comprises a fuel storage container and / or a damper. 4. The heating system according to claim 2, characterized in that the pressure reducing valve (44) is arranged in the flow direction before the metering valve (50) and / or before the damper or the storage container. . 5. A control device (56) is provided for fuel supply control, in particular control of the metering valve (50), which control device is further configured to control the pressure in the discharge pipe (30). The heating system for an automobile according to claim 3, wherein 6. The control device (56) comprises a fuel pump (24).
6. The vehicle heating system according to claim 5, characterized in that the fuel pump is controllable when the internal combustion engine (22) is not in operation. 7. A pressure sensor (48) is arranged in the fuel supply device (42), in particular in the flow direction, before the metering valve (50), in particular. The heating system for an automobile according to one. 8. The heating system for an automobile according to claim 1, wherein a volume flow sensor and / or a mass flow sensor is arranged in the fuel supply device (42). . 9. A throttle according to claim 1, wherein the throttle is arranged in the fuel supply device (42), particularly in the flow direction, before the metering valve (50). Automotive heating system. 10. A discharge pipe (30) comprising a reservoir and a heating device (10) according to any one of claims 1 to 9, wherein fuel is discharged from the reservoir by a fuel pump (24).
A motor vehicle which can be supplied to the internal combustion engine (22) via the. 11. A data bus, in particular a CAN bus, is provided, through which the control device for controlling the fuel supply of the heating device (10) is connected via the data bus to the fuel pump (2) of the motor vehicle.
Motor vehicle according to claim 10, characterized in that it is operatively connected to 4) and in particular that the fuel pump is controllable when the internal combustion engine (22) is not in operation.