JP2001234818A - Internal combustion engine having fuel reforming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a rapid increase in the reformed gas requirement during the acceleration or the like in feeding the reformed gas generated by reforming the fuel using a reforming catalyst in a reformer 6 to an intake system 2 of an engine 1 from a mixer 4 via a reformed gas storage tank. SOLUTION: The pressure in the formed gas storage tank 3 is detected by a pressure sensor 34, and when the pressure of the reformed gas is dropped below the regular value, the air feed to the reformer 6 is increased and the water feed is reduced in order to raise the fuel reforming temperature above the regular value, and the ratio of the partial oxidation reaction which is the exothermic reaction among the partial oxidation reaction and the steam reforming reaction in the fuel reforming reaction is controlled to increase.

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 having a fuel reforming apparatus for reforming a hydrocarbon fuel represented by gasoline or an alcohol fuel into hydrogen, carbon monoxide or the like by a reforming catalyst.

[0002]

2. Description of the Related Art As a conventional internal combustion engine with a fuel reformer, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 50-75602.

[0003] As a fuel reforming device, a first catalyst layer for a partial oxidation reaction and a second catalyst layer for a steam reforming reaction are used.
A catalyst layer, and these catalyst layers are both heated by the exhaust heat of the engine. Then, a hydrocarbon fuel and air are supplied to the first catalyst layer to cause a partial oxidation reaction, which is an exothermic reaction, and the resulting reformed gas is supplied to the engine, while the second heat is generated by the heat generated by the exothermic reaction. Heat the catalyst layer. And the second
Hydrocarbon fuel and water (steam) are supplied to the catalyst layer to cause a steam reforming reaction, which is an endothermic reaction, and the resulting reformed gas is supplied to the engine.

Further, as described in SAE Paper 931096, a reformed gas storage tank for temporarily storing reformed gas is provided to mitigate fluctuations in the supply of reformed gas to the engine. There is also.

[0005]

However, in such a conventional internal combustion engine with a fuel reformer, when the engine is accelerated, the carbonization is rapidly increased in order to secure reformed gas to be supplied to the engine. It is necessary to increase the amount of hydrogen fuel and water, and in this case, the temperature of the second catalyst layer decreases due to poor responsiveness of heat obtained from the exhaust gas. A mixture of hydrocarbon fuel and air is fed into the first catalyst layer so that the second catalyst layer has a predetermined temperature, and the mixture is controlled to increase the temperature of the second catalyst layer. During this time, the content of methane and lower hydrocarbons in the reformed gas increases, that is, the composition of the fuel supplied to the engine changes drastically, making it difficult to control combustion, and as a result, combustion deteriorates There has been a problem that the engine becomes unstable and the exhaust gas deteriorates.

[0006] Even when the predetermined temperature is secured, if the reforming reaction rate cannot be followed, the same problem as described above occurs. On the other hand, if the capacity of the reformed gas storage tank is increased to cope with a sudden increase in the amount of reformed gas required by the engine, a considerably large reformed gas storage tank is required because the reforming reaction speed is slow. As a result, there has been a problem that it is not realistic, for example, the vehicle body structure needs to be largely changed.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to appropriately cope with a rapid increase in the required amount of reformed gas when the engine is accelerated.

[0008]

According to the first aspect of the present invention, there is provided an internal combustion engine having a fuel reforming apparatus for reforming a fuel with a reforming catalyst and supplying the reformed fuel to the engine.
As shown in (A), a reformed gas pressure detecting means for detecting the pressure of the reformed gas, and a control for increasing the fuel reforming temperature when the pressure of the reformed gas is lower than normal. And a fuel reforming temperature control means.

Here, it is preferable that the reformed gas pressure detecting means detects a pressure in a reformed gas storage tank for temporarily storing the reformed gas (claim 2). The fuel reforming temperature control means may increase the rate of the exothermic reaction in the fuel reforming reaction in order to increase the fuel reforming temperature. More specifically, it is preferable to increase the ratio of the partial oxidation reaction of the partial oxidation reaction and the steam reforming reaction in the fuel reforming reaction (Claim 4). It is advisable to increase the amount and decrease the water supply (claim 5).

According to the present invention, in an internal combustion engine having a fuel reforming apparatus for reforming a fuel with a reforming catalyst and supplying the reformed fuel to the engine, as shown in FIG. And a fuel reforming temperature control means for controlling the fuel reforming temperature to be higher than normal when the acceleration is detected.

Here, the fuel reforming temperature control means may increase the rate of the exothermic reaction in the fuel reforming reaction in order to increase the fuel reforming temperature.
Assuming that exhaust heat is used as a heat source of the fuel reforming reaction, the exhaust temperature may be increased by controlling the engine.

Specifically, it is possible to delay the ignition timing of the internal combustion engine (claim 8), to advance the opening timing of the exhaust valve of the internal combustion engine (claim 9), and to directly inject fuel into the combustion chamber of the internal combustion engine. By injecting fuel from an appropriate fuel injection valve in the expansion stroke (claim 10), the exhaust gas temperature can be increased.

[0013] The acceleration detecting means detects a decrease in the pressure in the reformed gas storage tank or a decrease in the amount per unit time.
The acceleration may be detected (claims 11 and 12). The acceleration may be detected based on a decrease in the temperature of the reforming catalyst or a decrease in the temperature per unit time (claims 13 and 14).

In addition, an increase in the amount of depression of the accelerator pedal,
Alternatively, the acceleration may be detected based on the increase per unit time (claims 15 and 16). The acceleration may be detected based on an increase in the amount of fuel supplied to the fuel reformer per unit time based on the engine operating conditions (claim 17).

[0015]

According to the first aspect of the present invention, when the consumption of the reformed gas sharply increases and the pressure of the reformed gas decreases from the normal time, such as when the engine is accelerated, the fuel conversion is performed. Since the reforming temperature is controlled to be higher than usual, the reforming reaction speed is increased by increasing the fuel reforming temperature, so that the reformed gas amount required by the engine can be promptly supplied with a stable composition,
The effect of not causing deterioration of exhaust gas due to deterioration of combustion and not having to provide a large-capacity reformed gas storage tank is obtained.

Further, the pressure of the reformed gas can be accurately detected by detecting the pressure in the reformed gas storage tank as the pressure of the reformed gas. Further, in order to increase the fuel reforming temperature, the rate of the exothermic reaction in the fuel reforming reaction,
In particular, by increasing the ratio of the partial oxidation reaction among the partial oxidation reaction and the steam reforming reaction in the fuel reforming reaction, specifically, the air supply amount to the fuel reformer is increased, and the water supply amount is increased. The fuel reforming temperature can be rapidly increased by decreasing the temperature of the fuel cell (claims 3, 4, and 5).

According to the sixth aspect of the present invention, even if the required amount of the reformed gas suddenly increases at the time of acceleration of the engine, the fuel reforming temperature is controlled so as to be higher than usual at this time. Since the reforming reaction speed is increased by increasing the fuel reforming temperature, the amount of reformed gas required by the engine can be promptly supplied with a stable composition, without causing deterioration of exhaust accompanying combustion deterioration, and The effect that there is no need to provide a large-capacity reformed gas storage tank is obtained.

Further, in order to increase the fuel reforming temperature, the rate of the exothermic reaction in the fuel reforming reaction is increased, so that the fuel reforming temperature can be rapidly increased. Further, the ignition temperature of the internal combustion engine may be delayed, the opening timing of the exhaust valve of the internal combustion engine may be advanced, or fuel may be injected from the direct injection fuel injection valve in the expansion stroke to increase the exhaust gas temperature. When the exhaust heat is used as the heat source of the fuel reforming reaction, it is effective to increase the fuel reforming temperature (claims 8, 9 and 10).

Regarding the detection of the acceleration, it is best to detect it by the decrease in the pressure in the reformed gas storage tank in that the object to be controlled is sensed.
1) According to the pressure drop per unit time, sensing can be performed earlier (claim 12).

Further, when acceleration is detected due to a decrease in the temperature of the reforming catalyst, the temperature sensor therefor is an indispensable sensor for constructing the system, so that an increase in cost can be avoided (claim 13). According to the temperature decrease allowance, it becomes possible to perform sensing earlier.

In the case where acceleration is detected by increasing the amount of depression of the accelerator pedal, the intention of the driver may be reflected (claim 15). Sensing can be performed earlier (claim 16).

Further, even if acceleration is detected based on an increase in the amount of fuel supplied to the fuel reformer per unit time based on engine operating conditions, it is effective because the intention of the driver is almost reflected. Claim 17).

[0023]

Embodiments of the present invention will be described below. FIG. 2 is a system diagram of an internal combustion engine with a fuel reformer showing one embodiment of the present invention.

The intake system 2 of the engine 1 is provided with a mixer 4 for supplying reformed gas (gas fuel) guided from the reformed gas storage tank 3 into the intake air.
Is generally configured to include a gas fuel injection valve.

The exhaust system 5 of the engine 1 is provided with a heat exchanger (fuel and water evaporator) 12, a reformer 6, and an exhaust cooler 22, which will be described later. The reformer 6 has a first catalyst layer 8 and a second catalyst layer 9 with a partition wall 7 interposed therebetween.
The outlet side of the catalyst layer 8 and the inlet side of the second catalyst layer 9 communicate with each other. Here, the first catalyst layer 8 mainly reacts hydrocarbon fuel and air with the reforming catalyst (partial oxidation reaction; see the following formula (1)), and the second catalyst layer 9 mainly carbonizes with the reforming catalyst. Reacting hydrogen fuel with steam (steam reforming reaction;
See the following equation (2)).

C _m H _n + (m / 2) O ₂ → (n / 2) H
_{2 + mCO ··· (1) C} m H n + mH 2 O → (m +
n / 2) H ₂ + mCO (2) The partial oxidation reaction of the formula (1) is an exothermic reaction, and the steam reforming reaction of the formula (2) is an endothermic reaction.

The reformed gas mainly composed of hydrogen and carbon monoxide generated in the reformer 6 passes through the heat exchanger 11 from the outlet side passage 10 of the second catalyst layer 9, and is cooled. Are stored in the reformed gas storage tank 3.

Here, the fuel (hydrocarbon fuel) is
The fuel is supplied from a fuel tank (not shown) by the fuel pump 13, passes through the pipe of the heat exchanger 11 via the switching valve 14, further passes through the pipe of the heat exchanger 12, and reaches the mixture distribution device 18. Further, the fuel from the fuel pump 13 can be directly supplied to the starting mixer 21 by the switching valve 14.

Water is supplied from a water tank 15 by a water pump 16, passes through a pipe of the heat exchanger 11, further passes through a pipe of the heat exchanger 12, and reaches a mixture distribution device 18. The air is supplied by an air pump 17 and reaches an air-fuel mixture distribution device 18.

The air-fuel mixture distribution device 18 supplies an air-fuel mixture of fuel and air to the inlet side of the first catalyst layer 8 through a conduit 19, and supplies an air-fuel mixture of fuel and water vapor through a conduit 20 through a conduit 20. It is supplied to the inlet side of the two-catalyst layer 9, and the ratio of these can also be controlled.

The starting mixer 21 is provided in the middle of the conduit 19, and at the time of starting, the fuel from the fuel pump 13 is supplied as a liquid via the switching valve 14 to generate a mixture of fuel and air. Then, the mixture is supplied to the first catalyst layer 8.

Here, the fuel pump 13, water pump 16, air pump 1
7. The control of the switching valve 14, the mixture distribution device 18, and the like is performed by a control unit 30. The control unit 30 includes a crank angle sensor 31 capable of detecting the engine speed Ne, an accelerator pedal depression amount APO
, The temperature sensor 33 as a reforming catalyst temperature detecting means for detecting the temperature Tg of the second catalyst layer 9 of the reformer 6, the reformed gas storage tank 3
A signal is input from a pressure sensor 34 as a reformed gas pressure detecting means for detecting the internal pressure Pg.

Next, the operation will be described. At the time of starting, the fuel supplied from the fuel pump 13 is directly supplied from the switching valve 14 to the starting mixer 21 to be sprayed, and the air pump 17
From the air-fuel mixture distributor 18 to the starting mixer 2
After being mixed with the air fed into the reactor 1, the air is sent to the first catalyst layer 8 of the reformer 6, where the first catalyst layer 8 is ignited by a heater (not shown) or the like to start a partial oxidation reaction.

When the high-temperature reformed gas generated in the first catalyst layer 8 is supplied to the second catalyst layer 9 or the second catalyst layer 9 is heated by heat transfer through the partition wall 7, Is detected by the temperature sensor 33, and the switching valve 14 is switched.

By switching the switching valve 14, the fuel pump 1
The fuel from 3 is sent to the heat exchangers 11 and 12. As a result, the fuel is vaporized, mixed with the air in the air-fuel mixture distribution device 18 and sent as a gas mixture to the first catalyst layer 8, where a partial oxidation reaction is performed.

The generated reformed gas passes through the second catalyst layer 9 through the outlet side passage 10 to the heat exchanger 11 while applying heat to the second catalyst layer 9 through the partition wall 7 by the reaction.
After being cooled here, it is stored in the reformed gas storage tank 3 and supplied from the mixer 4 to the intake system 2 of the engine 1.

When the temperature of the second catalyst layer 9 becomes high and the reaction between the hydrocarbon fuel and steam (steam reforming reaction) can be sufficiently performed, the temperature rise of the second catalyst layer 9 is detected by the temperature sensor 33. , And shifts to steady operation.

In the normal operation, the mixture distribution device 18
Under the operation of, the water supplied from the water pump 16 is vaporized in the heat exchangers 11 and 12, and a mixture of hydrocarbon fuel and steam is directly supplied to the second catalyst layer 9 through the conduit 20. Thereby, the steam reforming reaction is performed in the second catalyst layer 9.

The reformed gas generated by the steam reforming reaction reaches the heat exchanger 11 from the outlet side passage 10, is cooled there, is stored in the reformed gas storage tank 3, and is supplied from the mixer 4 to the engine 4. 1 is supplied to the intake system 2.

As the temperature rises, the rate of the reaction between the hydrocarbon fuel and steam (steam reforming reaction) in the second catalyst layer 9 increases, in other words, the amount of air supplied decreases, and the first catalyst The reaction between the hydrocarbon fuel and air in the layer 8 (partial oxidation reaction) is limited.

The exhaust gas evaporates fuel and water in the heat exchanger 12, raises the temperature, gives heat to the first catalyst layer 8 and the second catalyst layer 9, is cooled by the exhaust cooler 22, and is discharged. Is done.
When the exhaust gas is cooled by the exhaust cooler 22, the condensed water is returned to the water pump 16 as a raw material by the recovery passage 23.
The water in the reformed gas that has been supplied to the suction side of the heat exchanger and generated is also recovered from the heat exchanger 11 by the recovery passage 24 in the same manner. By collecting this water, the water tank 15
Is saved, the capacity of the water tank 15 can be reduced.

Next, the control of the fuel reforming temperature to cope with a sudden increase in the required amount of the reformed gas during acceleration of the engine will be described. FIG. 3 is a flowchart for controlling the fuel reforming temperature.

In step 1 (referred to as S1 in the figure; the same applies hereinafter), the correction amount ΔGa of air and the correction amount ΔGs of water (water vapor) are set to 0 for initialization (ΔGa
= 0, ΔGs = 0).

In step 2, the fuel supply amount Gf is calculated based on engine operating conditions such as the engine speed Ne and the accelerator pedal depression amount (load) APO. In step 3, based on the calculated fuel supply amount Gf or based on the actual fuel supply amount detected by the sensor,
The air supply amount Ga = f (Gf) and the water supply amount Gs = h (Gf) are calculated by a predetermined function.

In step 4, the air supply amount Ga and the water supply amount Gs are respectively corrected by the correction amounts ΔGa, Δ
It is corrected by Gs. Ga = Ga + ΔGa Gs = Gs−ΔGs However, since ΔGa = 0 and ΔGs = 0 normally, the air supply amount Ga and the water supply amount Gs are calculated from the fuel supply amount Gf according to predetermined functions. .

In step 5, the calculated fuel supply amount G
Based on f, the air supply amount Ga, and the water supply amount Gs, corresponding amounts of fuel, air, and water are supplied, and a partial oxidation reaction and a steam reforming reaction are performed at a predetermined ratio.

In step 6, the pressure sensor 34
The reformed gas pressure Pg in the reformed gas storage tank 3 is detected. In step 7, the detected reformed gas pressure Pg is compared with a predetermined value to determine whether Pg ≧ predetermined value or Pg <predetermined value.

If Pg ≧ predetermined value, the routine proceeds to step 8, where the correction amount of air and water is set to ΔGa = 0, ΔGs
= 0, returning to step 2 and continuing the control. Pg <
If the value is the predetermined value, the process proceeds to step 9.

In step 9, the correction amount ΔGa of the air and the correction amount ΔGs of the water are calculated by a predetermined function based on the fuel supply amount Gf, by ΔGa = f ′ (Gf) and ΔGs = h ′.
(Gf) is calculated. Then, the process returns to step 2.

Therefore, in this case, the air supply amount Ga is increased and corrected by the correction amount ΔGa and the water supply amount Gs is reduced and corrected by the correction amount ΔGs in step 4 from the next time. In the supply.

Therefore, when the consumption of the reformed gas sharply increases and the pressure of the reformed gas becomes lower than usual, such as when the engine is accelerated, the air supply amount Ga to the fuel reformer is increased. By reducing the water supply amount Gs, the ratio of the partial oxidation reaction of the partial oxidation reaction and the steam reforming reaction in the fuel reforming reaction can be increased, that is, the ratio of the exothermic reaction can be increased. Since the reforming temperature is controlled to be higher than usual, the reforming reaction speed is increased by raising the fuel reforming temperature, so that the amount of reformed gas required by the engine can be quickly supplied with a stable composition, and combustion The effect is obtained that the exhaust gas does not deteriorate due to the deterioration and that it is not necessary to provide a large-capacity reformed gas storage tank.

Here, the step 6 corresponds to the pressure sensor 3
4 together with the reformed gas pressure detecting means,
The portion 9 corresponds to a fuel reforming temperature control means for controlling the fuel reforming temperature to be higher than normal when the pressure of the reformed gas is lower than normal.

Next, another embodiment of the present invention will be described. The flowchart of FIG. 4 is a simplified description of the fuel reforming temperature control. In step 11, it is determined whether the engine is in an acceleration state.

If the vehicle is not accelerating, the routine proceeds to step 12, where normal control is performed. In the case of the acceleration state, step 13
To increase the air supply amount Ga to the fuel reformer,
By reducing the water supply amount Gs, the rate of the partial oxidation reaction, which is an exothermic reaction, is increased.

According to this, even if the required amount of the reformed gas suddenly increases at the time of acceleration of the engine, the fuel reforming temperature is higher than usual at this time. The reaction rate can be increased, so that the amount of reformed gas required by the engine can be promptly supplied with a stable composition, without causing deterioration of exhaust gas due to deterioration of combustion, and a large-capacity reformed gas storage tank. The effect that it is not necessary to provide is obtained.

The modes of the acceleration detection are as follows (1) to (5).
Use any one of (7). (1) Reformed gas pressure Pg <predetermined value That is, is the pressure Pg in the reformed gas storage tank 3 lower than a predetermined value? It is the most basic, and is good in sensing an object to be controlled.

(2) Amount of change in reformed gas pressure ΔPg <predetermined negative value That is, is the amount of decrease (−ΔPg) in pressure Pg in reformed gas storage tank 3 per unit time exceeding a predetermined value? According to this, sensing can be performed earlier than the above (1).

(3) Reforming catalyst temperature Tg <predetermined value That is, is the temperature Tg of the second catalyst layer 9 lower than a predetermined value? Since a temperature sensor indispensable for system construction is used, cost increase can be avoided.

(4) Amount of change in reforming catalyst temperature ΔTg <predetermined negative value That is, is the decrease (−ΔTg) in temperature Tg of the second catalyst layer 9 per unit time exceeding a predetermined value? According to this, sensing can be performed earlier than the above (3).

(5) Accelerator pedal depression amount APO> predetermined value That is, has the accelerator pedal depression amount APO exceeded a predetermined value? It is far from the control target, but reflects the driver's intention.

(6) Change Δ of accelerator pedal depression amount
APO> predetermined value That is, has the increase amount (ΔAPO) per unit time of the accelerator pedal depression amount APO exceeded a predetermined value? According to this, sensing can be performed earlier than the above (5).

(7) Amount of change ΔGf of fuel supply amount> predetermined value That is, has the amount of increase (ΔGf) per unit time of the fuel supply amount Gf to the fuel reformer exceeded a predetermined value? It is far from the control target, but reflects the driver's intention.

FIG. 5 is a flowchart in the case where the fuel reforming temperature is controlled by the ignition timing of the internal combustion engine. In step 11, it is determined whether the engine is in an acceleration state. Any of the above (1) to (7) may be used for acceleration detection.

If the vehicle is not accelerating, the routine proceeds to step 12, where normal control is performed. In the case of the acceleration state, step 14
Then, the ignition timing of the internal combustion engine is delayed. As a result, the exhaust gas temperature rises, and when the exhaust heat is used as the heat source of the fuel reformer as in the system of FIG. 2, the fuel reforming temperature can be raised. A slight temperature increase is possible with this method.

FIG. 6 is a flowchart in the case where the fuel reforming temperature is controlled by the opening timing of the exhaust valve of the internal combustion engine. In step 11, it is determined whether the engine is in an acceleration state. Any of the above (1) to (7) may be used for acceleration detection.

If the vehicle is not accelerating, the routine proceeds to step 12, where normal control is performed. In the case of the acceleration state, step 15
Then, the opening timing of the exhaust valve of the internal combustion engine is advanced using the variable valve operating device. As a result, the exhaust gas temperature rises, and FIG.
When the exhaust heat is used as the heat source of the fuel reformer as in the system of the above, the fuel reforming temperature can be raised. A slight temperature increase is possible with this method.

FIG. 7 is a flowchart in the case where the fuel reforming temperature is controlled by the expansion stroke injection by the direct injection fuel injection valve of the internal combustion engine. In step 11, it is determined whether the engine is in an acceleration state. For acceleration detection, the above (1) to
Any of (7) may be used.

If the vehicle is not accelerating, the routine proceeds to step 12, where normal control is performed. In the case of the acceleration state, step 16
Then, the fuel injection is performed in the expansion stroke using the direct injection fuel injection valve. As a result, the exhaust gas temperature rises, and when the exhaust heat is used as the heat source of the fuel reformer as in the system of FIG. 2, the fuel reforming temperature can be raised. According to this, a rapid temperature rise is possible.

In the embodiment shown in FIGS. 4 to 7, the step 11 corresponds to the acceleration detecting means.
Parts 3, 14, 15, and 16 correspond to the fuel reforming temperature control means.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of the present invention.

FIG. 2 is a system diagram of an internal combustion engine with a fuel reformer showing one embodiment of the present invention.

FIG. 3 is a flowchart of fuel reforming temperature control.

FIG. 4 is a flowchart of a fuel reforming temperature control showing another embodiment.

FIG. 5 is a flowchart of a fuel reforming temperature control showing another embodiment.

FIG. 6 is a flowchart of a fuel reforming temperature control showing another embodiment.

FIG. 7 is a flowchart of a fuel reforming temperature control according to another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine 2 intake system 3 reformed gas storage tank 4 mixer (gas fuel injection valve) 5 exhaust system 6 reformer 7 partition 8 first catalyst layer 9 second catalyst layer 11 heat exchanger 12 heat exchanger 13 fuel pump 14 switching valve 16 water pump 17 air pump 18 air-fuel mixture distribution device 21 starting mixer 22 exhaust cooler 30 control unit 31 crank angle sensor 32 accelerator pedal sensor 33 temperature sensor 34 pressure sensor

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C01B 3/38 C01B 3/38 F01N 5/02 F01N 5/02 H F02D 13/02 F02D 13/02 Z 41/04 335 41/04 335Z F02G 5/02 F02G 5/02 Z F02M 31/20 F02M 31/20 C F02P 5/15 F02P 5/15 A (72) Inventor Kazufumi Ishiwatari 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Automobile Stock In-house (72) Inventor Naoshi Aoyama 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa F-term (reference) 3G022 AA01 CA04 DA02 EA00 GA08 3G092 AA01 AA06 AB02 AB05 AB15 BA09 BB06 DA02 DA03 DE03S EA04 GA12 HB00Z HB01Z HBZ HE01Z HF08Z HF23Z 3G301 HA01 HA23 KA01 KA12 MA11 MA19 NA08 ND02 PA01A PB03A PB08Z PE01Z PF03Z 4G040 EA02 EA03 EA06 EB16 EB43

Claims (17)

[Claims] 1. An internal combustion engine having a fuel reforming device for reforming a fuel with a reforming catalyst and supplying the reformed catalyst to the engine, a reformed gas pressure detecting means for detecting a pressure of the reformed gas, and a pressure of the reformed gas. An internal combustion engine with a fuel reforming device, comprising: fuel reforming temperature control means for controlling the fuel reforming temperature to be higher than normal when the temperature is lower than normal. 2. The internal combustion engine with a fuel reformer according to claim 1, wherein said reformed gas pressure detecting means detects a pressure in a reformed gas storage tank for temporarily storing the reformed gas. organ. 3. The fuel reforming system according to claim 1, wherein said fuel reforming temperature control means increases the rate of an exothermic reaction in the fuel reforming reaction in order to increase the fuel reforming temperature. Internal combustion engine with quality equipment. 4. The fuel reforming temperature control means increases the ratio of the partial oxidation reaction in the partial reforming reaction and the steam reforming reaction in the fuel reforming reaction in order to increase the fuel reforming temperature. The internal combustion engine with a fuel reformer according to claim 3, wherein 5. The fuel reforming temperature control means increases the amount of air supplied to the fuel reformer and decreases the amount of water supplied to the fuel reformer in order to increase the fuel reforming temperature. An internal combustion engine with the fuel reformer according to the above. 6. An internal combustion engine having a fuel reforming apparatus for reforming a fuel with a reforming catalyst and supplying the reformed fuel to the engine, comprising: acceleration detecting means for detecting acceleration of the engine; An internal combustion engine with a fuel reforming device, comprising: a fuel reforming temperature control means for controlling the temperature to be higher than usual. 7. The internal combustion engine with a fuel reforming apparatus according to claim 6, wherein said fuel reforming temperature control means increases the rate of an exothermic reaction in the fuel reforming reaction in order to increase the fuel reforming temperature. organ. 8. The fuel reforming temperature control means delays the ignition timing of the internal combustion engine to increase the temperature of exhaust gas used as a heat source of the fuel reforming reaction in order to increase the fuel reforming temperature. An internal combustion engine with a fuel reformer according to claim 6. 9. The fuel reforming temperature control means may increase the temperature of exhaust gas used as a heat source of a fuel reforming reaction by increasing the opening timing of an exhaust valve of an internal combustion engine to increase the fuel reforming temperature. The internal combustion engine with a fuel reformer according to claim 6, wherein: 10. The fuel reforming temperature control means injects fuel in an expansion stroke from a fuel injection valve capable of directly injecting fuel into a combustion chamber of an internal combustion engine in order to increase the fuel reforming temperature. The internal combustion engine with a fuel reformer according to claim 6, wherein the temperature of exhaust gas used as a heat source of the reforming reaction is increased. 11. The acceleration detection means according to a decrease in pressure in a reformed gas storage tank for temporarily storing reformed gas,
The acceleration is detected.
An internal combustion engine with a fuel reformer according to any one of the above. 12. The apparatus according to claim 6, wherein said acceleration detecting means detects the acceleration based on a decrease in pressure per unit time in a reformed gas storage tank for temporarily storing the reformed gas. An internal combustion engine with a fuel reformer according to claim 10. 13. The acceleration detecting means according to claim 6, wherein said acceleration detecting means detects the acceleration based on a decrease in the temperature of the reforming catalyst.
An internal combustion engine with a fuel reformer according to any one of claims 10 to 10. 14. The fuel according to claim 6, wherein the acceleration detecting means detects the acceleration based on a decrease in the temperature of the reforming catalyst per unit time. Internal combustion engine with reformer. 15. An internal combustion engine with a fuel reformer according to claim 6, wherein said acceleration detecting means detects acceleration by increasing an amount of depression of an accelerator pedal. organ. 16. The fuel according to claim 6, wherein said acceleration detecting means detects acceleration based on an increase in the amount of depression of an accelerator pedal per unit time. Internal combustion engine with reformer. 17. The apparatus according to claim 6, wherein said acceleration detecting means detects acceleration based on an increase in fuel supply amount to the fuel reformer per unit time based on engine operating conditions.
An internal combustion engine with a fuel reformer according to any one of claims 10 to 10.