JP2002122053A - Fuel-feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel-feeding system for cooling a pump controller and miniaturizing a canister. SOLUTION: A fuel pump 20 is housed in a fuel tank 10. The pump controller 30 feeds power to a pump body 22 according to engine operation state, so that the pump body 22 of the fuel pump discharges a fuel quantity necessary for the engine and controls the rotational frequency of the pump body 22. The canister 40 adsorbs vaporized fuel inside the fuel tank 10 by activated carbon housed in its interior. Piping 105 is connected to the canister 40, to introduce the atmosphere inside the canister 40. When a solenoid valve 106 is opened, the atmosphere is introduced inside the canister 40 from the piping 105. Since the piping 105 is in contact with the pump controller 30, the atmosphere introduced to the canister 40 by the piping 105 is heated by the pump controller 30 and the temperature of the canister 40 is increased by introducing the heated atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system including a fuel pump for controlling a fuel discharge amount and a canister for adsorbing evaporated fuel.

[0002]

2. Description of the Related Art Electric power supplied to an electromagnetic drive unit such as a motor of a fuel pump is controlled by a pump control device in accordance with the amount of fuel required by an engine, and the fuel heated from the engine side is not returned to a fuel tank. Less fuel supply systems are known. By preventing the fuel heated on the engine side from flowing back to the fuel tank, it is possible to suppress an increase in the fuel temperature in the fuel tank and reduce the amount of fuel vapor generated. In particular, in a so-called in-tank type fuel supply system in which a fuel pump is housed in a fuel tank, an increase in the temperature of the fuel in the fuel tank is suppressed by controlling the electric power supplied to the fuel pump and reducing the calorific value of the fuel pump. It is desirable to do.

However, most of the electric power supplied to an electromagnetic drive unit such as a motor of a fuel pump is converted into heat instead of rotating the motor. The fuel in the fuel tank evaporates due to the heat generated. Therefore, it has been considered that evaporated fuel generated in the fuel tank is adsorbed by activated carbon or the like in the canister and discharged to the intake pipe.

[0004]

However, since the pump control device for controlling the number of revolutions of the motor generates heat, it is necessary to cool the pump control device. When the temperature of the pump control device rises, internal circuit elements may be damaged.

Further, when the atmosphere is introduced into the canister and the evaporated fuel adsorbed on the canister is discharged into the intake pipe, all the adsorbed evaporated fuel cannot be desorbed and discharged.
Evaporated fuel remains in the canister without being desorbed. If the vaporized fuel adsorbed on the canister remains without being desorbed, the amount of vaporized fuel that canister can adsorb is reduced.

[0006] Since adsorbing fuel vapor to the canister is an endothermic reaction, the rate of fuel vapor desorbed from the canister can be increased by heating the canister with a heater provided in the canister. If the amount of evaporated fuel to be adsorbed is the same, the canister can be downsized if the rate of desorbing the evaporated fuel is higher.

[0007] The ORVR (O) prevents the fuel vapor in the fuel tank from being discharged into the atmosphere from the fuel supply port during fueling.
n Board Refueling Vapor Recovery) system needs to adsorb a large amount of fuel vapor to the canister,
A canister with high adsorption capacity is required. For example, if the rate at which the fuel vapor is desorbed is increased by heating the canister with a heater, the canister can be downsized.

However, if a heater is provided in the canister,
There are problems that the structure of the canister becomes complicated and the manufacturing cost increases. An object of the present invention is to provide a fuel supply system that cools a pump control device and reduces the size of a canister.

[0009]

According to the fuel supply system of the first aspect of the present invention, the air in the heated air introduction pipe is heated by heating the air introduction pipe with the heat generated by the pump control device. Can be introduced to heat the canister. Since the reaction in which the evaporated fuel adsorbed by the canister is desorbed is an endothermic reaction, by introducing the heated atmosphere into the canister, the rate of the evaporated fuel desorbed from the canister increases. Since the air introduced to discharge the fuel adsorbed in the canister is heated by the heat generated by the pump control device, it is not necessary to provide a heating means in the canister itself. Therefore, the size of the canister can be reduced without changing the structure of the conventional canister. Further, the pump control device heats the air introduction pipe, and the heat of the pump control apparatus is transmitted to the air introduction pipe, so that the pump control apparatus can be cooled.

According to the fuel supply system of the second aspect of the present invention, since the pump control device is disposed near the canister, the temperature of the atmosphere in the air inlet pipe heated by the pump control device is introduced into the canister. It is possible to suppress a decrease by the time it is performed.

According to the fuel supply system of the third aspect of the present invention, a fuel pump for controlling the power supplied to the electromagnetic drive unit in accordance with the amount of fuel required by the engine is accommodated in the fuel tank. Therefore, the calorific value of the fuel pump can be reduced, and the generation of fuel vapor in the fuel tank can be reduced.

According to a fourth aspect of the present invention, there is provided a fuel supply system comprising an on-off valve for opening and closing a passage of an evaporative fuel introduction pipe for introducing the evaporative fuel in the fuel tank to the canister. By using the present invention in an ORVR system in which the on-off valve opens when the engine is stopped and fuel is supplied to the fuel tank, and the evaporated fuel generated during refueling is adsorbed to the canister
A canister that needs to adsorb a large amount of fuel vapor can be downsized.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. An ORVR system according to one embodiment of the present invention is shown in FIG. The fuel pump 20 is an in-tank type fuel pump housed in the fuel tank 10. The flange 21 of the fuel pump 20 is connected to the fuel tank 1
It is attached to 0. The pump main body 22 as an electromagnetic drive unit sucks and pressurizes the fuel in the fuel tank 10 by rotating an internal armature. The fuel pressurized by the pump body 22 is subjected to removal of foreign matter by a filter 23 and discharged from a discharge pipe 24 to the engine side.

The pump control device 30 is mounted on the flange 21 and is electrically connected to the pump body 22 by a lead wire 25. The pump control device 30 includes the canister 4
It is located near zero. The pump control device 30 has a circuit element therein, and the heat generated by the circuit element is radiated by the radiation fins 31. The pump control device 30 supplies power to the pump main body 22 according to the engine operating state so that the pump main body 22 discharges a fuel amount required by the engine, and controls the rotation speed of the pump main body 22. Therefore,
The fuel discharged from the fuel pump 20 is not returned to the fuel tank 10. That is, the fuel supply system of the present embodiment is returnless.

The canister 40 contains therein activated carbon for adsorbing fuel vapor in the fuel tank 10. The fuel tank 10 and the canister 40 are connected to a pipe 101 as an evaporative fuel introduction pipe. On-off valve 102 is the fuel tank 1
This is a mechanical valve that opens and closes the passage of the pipe 101 with a pressure within 0. The on-off valve 102 opens when the pressure in the fuel tank 10 becomes equal to or higher than a predetermined pressure. Fuel tank 10 during fueling
When the internal pressure rises, the on-off valve 102 opens and the piping 10
1 and the evaporated fuel in the fuel tank 10 passes through the canister 40.
Is adsorbed inside. The on-off valve 102 may be an electromagnetic valve instead of a mechanical valve.

A pipe 105 serving as an air introduction pipe is connected to the canister 40 so that air can be introduced into the canister 40. When the solenoid valve 106 is opened, the atmosphere is introduced into the canister 40 from the pipe 105. The pipe 105 is in contact with the pump control device 30. The pipe 110 is connected to an intake pipe (not shown). When the solenoid valve 106 and the solenoid valve 111 are opened during operation of the engine, the atmosphere is introduced from the pipe 105 into the canister 40 by the negative pressure on the intake pipe side, and the evaporated fuel adsorbed in the canister 40 is discharged to the intake pipe side. .

In this embodiment, since the pipe 105 is in contact with the pump control device 30, the atmosphere in the pipe 105 is heated by the heat generated by the pump control device 30. Therefore, during operation of the engine, the solenoid valve 106 and the solenoid valve 111
Is opened, and the evaporated fuel adsorbed in the canister 40 is discharged to the intake pipe side by the air introduced into the canister 40 from the pipe 105, and the temperature in the canister 40 is increased by the heated air in the pipe 105. Since it is an endothermic reaction that the evaporated fuel adsorbed on the activated carbon of the canister 40 is desorbed, when the atmosphere heated from the pipe 105 is introduced into the canister 40, the temperature of the canister 40 rises and desorbs from the canister 40. The proportion of evaporated fuel that increases is increased.
When the rate of the desorbed fuel vapor increases, the amount of fuel vapor that can be adsorbed increases. Therefore, if the ability to adsorb the evaporated fuel is the same, the size of the canister can be reduced compared to a system in which the canister 40 is not heated. In particular, when the present invention is applied to an ORVR system in which it is necessary to adsorb a large amount of fuel vapor and the size of the canister may increase, the size of the canister can be reduced.

Further, since the canister 40 is heated by the atmosphere in the pipe 105 heated by the pump control device 30, it is not necessary to newly provide a means for heating the canister 40. Therefore, the configuration of the fuel supply system is simplified. The heat generated by the pump control device 30 is
Since the heat is conducted to the pipe 105 and the pipe 105 is heated, the pump control device 30 can be cooled. Therefore, the temperature rise of the pump control device 30 can be suppressed, and damage to internal circuit elements can be prevented.

The electric power supplied to the fuel pump 20 housed in the fuel tank 10 is controlled by the pump control device 30 in accordance with the amount of fuel required by the engine.
The calorific value of the fuel pump 20 is reduced. Therefore, an increase in the fuel temperature in the fuel tank 10 is suppressed, and the amount of generated fuel is reduced.

In the above embodiment of the present invention, the fuel tank 10
Although the fuel pump 20 is housed inside, the fuel pump may be arranged outside the fuel tank. Further, although the present invention is applied to the ORVR system, the present invention may be applied to a fuel supply system other than the ORVR system.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a fuel supply system according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fuel tank 20 Fuel pump 22 Pump body (electromagnetic drive part) 30 Pump control device 40 Canister 101 Piping (evaporating fuel introduction pipe) 102 On-off valve 105 Piping (atmosphere introduction pipe)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 25/08 311 F02M 25/08 311G 37/00 301 37/00 301H (72) Inventor Kengo Okada Aichi 1-1-1, Showa-cho, Kariya F-term in DENSO Corporation (reference) 3G044 BA40 CA17 DA03 DA04 DA06 EA05 EA10 FA04 FA05 FA24 GA03 GA04 GA08 GA09 GA16 GA23 GA24 GA29

Claims (4)

[Claims] 1. A fuel pump for discharging fuel sucked from a fuel tank by a driving force of an electromagnetic drive unit, a pump control device for controlling electric power supplied to the electromagnetic drive unit, and adsorbing fuel vapor in the fuel tank. A canister for discharging adsorbed evaporated fuel; and an air introduction pipe for introducing air into the canister, wherein the pump control device and the atmosphere are configured to be able to heat the air introduction tube with heat generated by the pump control device. A fuel supply system characterized by disposing an introduction pipe. 2. The fuel supply system according to claim 1, wherein the pump control device is disposed near the canister. 3. The fuel supply system according to claim 1, wherein the fuel pump is housed in the fuel tank. 4. An on-off valve for introducing evaporative fuel in the fuel tank into the canister, and an on-off valve for opening and closing a passage of the evaporative fuel introduction pipe, wherein the on-off valve is used to supply fuel to the fuel tank. 4. The fuel supply system according to claim 1, wherein the valve is opened.