JP5580781B2 - Fuel supply device - Google Patents

Description

  The present invention relates to a fuel supply device that supplies fuel to an internal combustion engine.

  Conventionally, in a fuel supply device that supplies fuel to an internal combustion engine, unburned HC, PM, etc. of exhaust gas is generated due to, for example, that the fuel supplied by injection adheres to the wall surface of the combustion chamber as a liquid. There are increasing problems. Therefore, Patent Document 1 discloses a technique for suppressing unburned HC, PM, and the like of exhaust gas by injecting and supplying gaseous fuel obtained by vaporizing liquid fuel at the time of cold start for starting the internal combustion engine at the time of cold. Has been.

  However, it is difficult to estimate and grasp the actual supply amount of the gaseous fuel, such as the mass and the molar amount, as compared with the liquid fuel. Moreover, when supplying gaseous fuel via some container or piping, since gaseous fuel is supplied with the air etc. which remain | survive in a container etc., it is further difficult to grasp | ascertain the supply amount of a substantial fuel. For this reason, the supply amount of air necessary for fuel combustion cannot be obtained accurately, and control of the internal combustion engine may become unstable during the period in which the gaseous fuel is supplied.

JP 2003-343365 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to make the control of the internal combustion engine unstable during a period in which gaseous fuel is supplied in a fuel supply device that supplies fuel to the internal combustion engine. It is to reduce the risk of becoming.

[Means of Claim 1]
According to the means of claim 1, the fuel supply device includes a liquid fuel supply means for supplying liquid fuel to either the combustion chamber of the internal combustion engine or the intake line communicating with the combustion chamber of the internal combustion engine, and the liquid fuel is vaporized. A vaporization container that forms a space to be vaporized, an injection valve that injects liquid fuel into the vaporization container, fuel vaporization means that vaporizes the liquid fuel into gas fuel, and a gas fuel obtained by the fuel vaporization means that serves as an intake line While supplying gaseous fuel to the intake line , the first detection means for detecting the temperature and pressure of the vaporization container, the second detection means for detecting the temperature and pressure of the intake line, And control means for controlling the gaseous fuel supply means based on the detection values obtained by the first detection means and the second detection means .

First, while the gaseous fuel is being supplied to the intake line, the temperature and pressure of the vaporization container can be accurately detected by controlling the gaseous fuel supply means based on the detection value obtained by the first detecting means . The substantial supply amount of gaseous fuel and air sucked into the combustion chamber from the vaporization container can be accurately grasped. For this reason, since the supply amount of air required for combustion of gaseous fuel can be calculated | required correctly, a possibility that control of an internal combustion engine may become unstable during the period which supplies gaseous fuel can be reduced.

In addition, while supplying the gaseous fuel to the intake line, the gaseous fuel supply means is controlled based on the detection values obtained by the first detection means and the second detection means, thereby substantially reducing the air supplied from the intake line. Therefore, the possibility of unstable control of the internal combustion engine can be reduced.

[Means of claim 2 ]
According to the means of claim 2 , the fuel supply device includes the second detection means for detecting the pressure in the intake line, and the control means is configured to detect the first detection means and the first detection means while supplying the gaseous fuel to the intake line. 2 Control the gaseous fuel supply means based on the detection value obtained by the detection means.
The temperature range of the air supplied from the intake line is -20 to 60 ° C. Moreover, if a use area is decided, it can be limited to a narrower temperature range. For this reason, the substantial supply amount of the air supplied from the intake line can be accurately grasped by detecting only the pressure of the intake line and fixing it without detecting the temperature, for example. For this reason, the number of necessary sensors constituting the second detection means can be reduced.

[Means of Claims 3 to 5 ]
According to the means of claims 3 to 5 , the fuel vaporization means is connected to the vaporization container and introduces the atmosphere into the vaporization container, and the reverse is incorporated in the atmosphere introduction path and prevents the reverse flow from the vaporization container. And a stop valve.
When the engine room is cold, for example, at a low temperature such as room temperature, when the atmosphere cannot be introduced into the vaporization vessel, the vaporization vessel pressure corresponding to the supply pressure of the gaseous fuel is equivalent to the saturated vapor pressure of the fuel at normal temperature. Only rises. For this reason, there is a possibility that the required amount of gaseous fuel cannot be supplied to the intake line.

Therefore, fuel vaporization means is provided so that the atmosphere can be introduced into the vaporization vessel and the backflow from the vaporization vessel to the atmosphere side can be prevented. Thereby, before injecting liquid fuel to a vaporization container, the pressure of a vaporization container can be raised to atmospheric pressure equivalent by air introduction. For this reason, by injecting liquid fuel into a vaporization container having a pressure corresponding to atmospheric pressure, the pressure in the vaporization container can be increased to a level obtained by adding a pressure corresponding to the saturated vapor pressure of fuel to a pressure corresponding to atmospheric pressure. .
As a result, the supply pressure of the gaseous fuel can be increased even during a cold start, so that a necessary supply amount of gaseous fuel can be supplied to the intake line.

[Means of Claims 6 and 7 ]
According to the means of claims 6 and 7 , the control means calculates the air-fuel ratio in the vaporization container based on the detection value obtained by the first detection means.
This means exemplifies parameters to be calculated by the control means.

[Means of Claim 8 ]
According to the means of claim 8 , the control means calculates the flow rate of the gaseous fuel supplied from the vaporization container to the intake line based on the detection values obtained by the first detection means and the second detection means.
This means exemplifies parameters to be calculated by the control means.

It is a block diagram of a fuel supply apparatus. It is a flowchart which shows the control flow of a fuel supply apparatus.

  The fuel supply apparatus according to the embodiment includes a liquid fuel supply unit that supplies liquid fuel to either one of the combustion chamber of the internal combustion engine or the intake line that communicates with the combustion chamber of the internal combustion engine, and a vaporization that forms a space in which the liquid fuel is vaporized. A fuel vaporization means having a container and an injection valve for injecting liquid fuel into the vaporization container and vaporizing the liquid fuel into gas fuel, and a gas fuel supply for supplying the gas fuel obtained by the fuel vaporization means to the intake line Control means for controlling the gaseous fuel supply means on the basis of the detection value obtained by the first detection means while the gaseous fuel is being supplied to the intake line. Means.

The fuel supply device includes second detection means for detecting the temperature and pressure of the intake line, and the control means is obtained by the first detection means and the second detection means while supplying gaseous fuel to the intake line. The gaseous fuel supply means is controlled based on the detected value.
The fuel vaporization means includes an air introduction path that is connected to the vaporization container and introduces the atmosphere into the vaporization container, and a check valve that is incorporated in the air introduction path and prevents a backflow from the vaporization container.

The control means calculates the air-fuel ratio in the vaporization container based on the detection value obtained by the first detection means.
Further, the control means calculates the flow rate of the gaseous fuel supplied from the vaporization container to the intake line based on the detection values obtained by the first detection means and the second detection means.

[Configuration of Example]
The structure of the fuel supply apparatus 1 of an Example is demonstrated using FIG.
For example, the fuel supply device 1 mainly operates by injecting and supplying liquid fuel directly to the combustion chamber 3 of the internal combustion engine 2. For example, gasoline is supplied to the internal combustion engine 2 as liquid fuel.

  The fuel supply device 1 is obtained by a liquid fuel supply means 4 that supplies liquid fuel to the combustion chamber 3 of the internal combustion engine 2, a fuel vaporization means 5 that vaporizes the liquid fuel into a gaseous fuel, and a fuel vaporization means 5. The gas fuel supply means 7 which supplies the gaseous fuel to be supplied to the intake line 6, the liquid fuel supply means 4, the fuel vaporization means 5, and the control means 8 for controlling the operation of various devices included in the gas fuel supply means 7 are provided.

  Here, the internal combustion engine 2 is started by a known starter 10 including a DC motor (not shown), and is started by the output of the DC motor included in the starter 10. Note that the starter 10 is activated by a command from the control means 8 both in a cold state after the internal combustion engine 2 is stopped for a long time and in a warm state after an idle stop, for example, to start the internal combustion engine 2. Start.

  The intake line 6 has a known configuration including a throttle device 11, an intake manifold 12, and the like. Furthermore, the intake manifold 12 has a surge tank 13 that receives intake air mainly composed of fresh air, and a plurality of branch pipes 14 that branch from the surge tank 13 and sequentially guide the intake air to the plurality of combustion chambers 3. This is a well-known configuration. That is, the intake line 6 branches to the same number of cylinders of the internal combustion engine 2 in the intake manifold 12 and is connected to the internal combustion engine 2.

  The liquid fuel supply means 4 includes a low pressure feed pump 17 that pumps liquid fuel from a fuel tank 16 that stores the liquid fuel, a high pressure pump 18 that discharges the liquid fuel pumped by the low pressure feed pump 17 at a high pressure, and a high pressure pump 18. The common rail 19 as a pressure accumulating container for accumulating the liquid fuel discharged from the high pressure state and the combustion chamber 3 is mounted on the internal combustion engine 2, receives the distribution of the high pressure liquid fuel from the common rail 19, and receives the liquid fuel in the combustion chamber 3. And an injector 20 for injecting fuel.

  The low pressure feed pump 17, the high pressure pump 18, the common rail 19 and the injector 20 have a well-known structure, and the low pressure feed pump 17, the high pressure pump 18 and the injector 20 operate according to a command given from the control means 8. Controlled. Further, the common rail 19 has a pressure sensor 21 for detecting the fuel pressure of the liquid fuel to be accumulated, and the detection signal of the pressure sensor 21 is output to the control means 8 to control the low pressure feed pump 17, the high pressure pump 18 and the injector 20. Used for

  The fuel vaporization means 5 includes a vaporization container 23 that forms a space in which the liquid fuel is vaporized, and an injection valve 24A that injects the liquid fuel into the vaporization container 23.

  The vaporization container 23 is attached to, for example, a cylinder block of the internal combustion engine 2. For this reason, the inside of the vaporization container 23 at the time of warm is transferred from the engine cooling water and kept in a high temperature state, and the liquid fuel is easily vaporized. In addition, a shielding plate 26 that shields the gaseous fuel take-out port 25 from the injection port of the injection valve 24A is provided in the vaporization vessel 23, and the liquid fuel injected from the injection valve 24A is gas in the shielding plate 26. It is prevented from being mixed with fuel and taken out.

  In addition, in the bottom part of the vaporization container 23, in order to return the liquid fuel collected without vaporization among the injected liquid fuel, or the liquid fuel collected by vaporization once again to the fuel tank 16 The return flow path 27 is connected. An open / close valve 28 is disposed in the return flow path 27, and the open / close valve 28 opens and closes the return flow path 27 in accordance with the liquid level of the liquid fuel in the vaporization container 23. Thereby, the inside of the vaporization container 23 is maintained in the optimal state so that gaseous fuel according to a required supply amount can be obtained.

  The injection valve 24 </ b> A is mounted on the vaporization container 23, and a tip portion having a liquid fuel injection port projects into the vaporization container 23. The liquid fuel supply path 29a for supplying the liquid fuel to the injection valve 24A branches from the liquid fuel supply path 29b for supplying the liquid fuel from the low pressure feed pump 17 to the high pressure pump 18. The liquid fuel supply path 29a is configured such that the liquid fuel passing therethrough can transfer heat with, for example, engine cooling water, and when warm, liquid fuel that has become hot due to heat transfer from the engine cooling water is injected. It is supplied to the valve 24 </ b> A and injected into the vaporization container 23. For this reason, vaporization of the liquid fuel in the vaporization container 23 is further promoted.

  The fuel vaporization means 5 is connected to the vaporization vessel 23 to introduce the atmosphere into the vaporization vessel 23, and the check valve 32 that is incorporated in the atmospheric introduction passage 31 and prevents backflow from the vaporization vessel 23. And have.

  The gaseous fuel supply means 7 has the same number of injection valves 24B for injecting gaseous fuel as the number of cylinders of the internal combustion engine 2, and one injection valve 24B is arranged for each branch pipe 14 of the intake manifold 12. Each injection valve 24 </ b> B has a tip portion having a gaseous fuel injection port protruding into the branch pipe 14, and injects the gaseous fuel into the branch pipe 14.

  Moreover, the gaseous fuel supply means 7 has the gaseous fuel supply path 34 which supplies gaseous fuel to each injection valve 24B. Here, the gaseous fuel supply passage 34 connects the gaseous fuel outlet 25 in the vaporization vessel 23 and the gaseous fuel inlet in each injection valve 24B, and the vaporization vessel 23 connects to each injection valve 24B. On the way, it branches to the same number as the injection valve 24B.

  The control means 8 is based on detection signals input from the pressure sensor 21 mounted on the common rail 19 and other various sensors, and various devices constituting the liquid fuel supply means 4, the fuel vaporization means 5, the gaseous fuel supply means 7, and the like. Is controlled. That is, the control means 8 receives a variety of detection signals and synthesizes and outputs control signals for controlling various devices, and a power source (not shown) receiving the control signals. The power converter (not shown) etc. which supplies electric power to various apparatuses from are comprised.

  The microcomputer has a well-known structure including a CPU that performs control processing and arithmetic processing, a storage device such as a ROM and RAM that stores various data and programs, an input device, an output device, and the like. is there.

The fuel supply device 1 also includes first detection means 36 that detects the temperature and pressure of the vaporization container 23, and second detection means 37 that detects the temperature and pressure of the intake line 6.
Here, the first detection means 36 includes a well-known temperature sensor 36a and a well-known pressure sensor 36b. The temperature sensor 36a and the pressure sensor 36b detect the temperature and pressure in the vaporization vessel 23, respectively, and detect them. A signal is output to the control means 8.

  The second detection means 37 includes a well-known temperature sensor 37a and a well-known pressure sensor 37b. The temperature sensor 37a and the pressure sensor 37b are respectively the temperature in the upstream pipe of the surge tank 13 in the intake manifold 12 and The pressure is detected and a detection signal is output to the control means 8.

  The control means 8 controls the gaseous fuel supply means 7 based on the detection signals obtained by the first and second detection means 36 and 37 while supplying the gaseous fuel to the intake line 6. More specifically, the control means 8 calculates the air-fuel ratio in the vaporization container 23 based on the detection value obtained by the first detection means 36, and further, the detection obtained by the first and second detection means 36, 37. Based on the value, the flow rate of the gaseous fuel supplied from the vaporization vessel 23 to the intake line 6 is calculated.

  Here, the period during which gaseous fuel is supplied to the intake line 6 is included in the cranking period in which the internal combustion engine 2 that is stopped regardless of whether it is cold or warm is started by the starter 10. Then, for example, the supply of the gaseous fuel starts with the starter 10 being activated, and the supply of the gaseous fuel by the gaseous fuel supply means 7 is switched to the supply of the liquid fuel by the liquid fuel supply means 4 during the cranking.

[Control Method of Example]
Hereinafter, a control method related to the supply of gaseous fuel by the control means 8 will be described based on the flowchart of FIG.
Here, the control flow shown in the flowchart of FIG. 2 is repeatedly processed until the fuel supply is switched from the gaseous fuel supply to the liquid fuel supply when the cranking starts and the process starts.

According to the flowchart of FIG. 2, first, in step S <b> 1, the first detection means 36 detects the temperature T ₀ and the pressure P ₀ in the vaporization vessel 23.
In steps S2 to S4, the air-fuel ratio λ ₀ of the air-fuel mixture in the vaporization vessel 23 is calculated using the temperature T ₀ and the pressure P ₀ .

First, in step S2, the saturated vapor pressure P _sat of the fuel in the vaporization vessel 23 is obtained using the temperature T ₀ . The saturated vapor pressure P _sat of the fuel may be calculated based on the data stored in the microcomputer in advance as map data or table data, for example. You may calculate using various approximate expressions.

Subsequently, in step S3, and it calculates the partial pressure _{P a0} of the air in the vaporization vessel 23 by subtracting the saturated vapor pressure _{P sat} from the pressure _{P 0.}
In step S4, the saturated vapor pressure P _sat is divided by the partial pressure _{Pa 0} to calculate the air-fuel ratio λ ₀ as a molar ratio.

Next, in step S5, to detect the temperature _{T 1} and pressure _{P 1} of the intake line 6 by the second detecting means 37.
Then, in step S6 to S9, and calculates the supply amount of the mixture from the vaporization vessel 23 to the intake line 6 by using the temperature T ₁ and pressure P ₁ and the like.

First, in step S6, a critical pressure P _* that is a criterion for determining whether the flow from the vaporization vessel 23 to the intake line 6 is a choke flow or a subsonic flow is calculated.
Here, the choked flow, be varied in either the pressure P ₁ is larger side or small side, a flow rate of the mixture flowing from the vaporization vessel 23 to the intake line 6 does not change, the pressure P ₁ is critical When the pressure is equal to or lower than P _* , the flow from the vaporization vessel 23 to the intake line 6 becomes a choke flow.

In addition, the subsonic flow, depending on the magnitude of the pressure P _1, a stream flow rate changes of the mixture flowing from the vaporization vessel 23 to the intake line 6, when the pressure P ₁ is greater than the critical pressure P _* In addition, the flow from the vaporization container 23 to the intake line 6 is a subsonic flow.
The critical pressure P _* can be calculated, for example, by the following formula 1 using the specific heat ratio (constant pressure specific heat / constant volume specific heat) γ ₀ of the gas mixture in the vaporization vessel 23.
[Formula 1]

なお、モル比ｒ_ａ０、ｒ_ｆ０は、空燃比λ_０を用いて算出することができる。 The specific heat ratio γ ₀ is expressed by the following equation using the specific heat ratios γ _a and γ _f of air and gas fuel, and the molar ratios r _a0 and r _f0 of the air and gas fuel to the air-fuel mixture in the vaporization vessel 23. 2 can be calculated.
[Formula 2]

The molar ratios r _a0 and r _f0 can be calculated using the air-fuel ratio λ ₀ .

Subsequently, in step S7, or flow from the vaporization vessel 23 to the intake line 6 is any flow of choked flow or subsonic flow, i.e., the determination of whether the pressure P ₁ is greater than the critical pressure P _* To do. When the pressure _{P 1} is determined to be greater than the critical pressure _{P *} (YES), the process proceeds to step S8, when the pressure _{P 1} is determined to the critical pressure _{P *} less (NO), the process proceeds to step S9.

In step S8, the flow rate of the mixture supplied to flow from the vaporization vessel 23 to the intake line 6 in the case of subsonic flow, for example, it is calculated by equation 3 below as the mass flow rate q _w. In Equation 3, the mass flow rate q _w is calculated using the pressures P ₀ , P ₁ and the specific heat ratio γ ₀ , the air-fuel mixture density ρ ₀ , the speed of sound a ₀ , and the choke nozzle cross-sectional area A. The choke nozzle cross-sectional area A corresponds to, for example, the flow path diameter of the gaseous fuel supply path 34, and may be obtained experimentally in order to increase the accuracy of the calculated value.
[Formula 3]

In step S9, the flow rate of the mixture supplied to flow from the vaporization vessel 23 to the intake line 6 when the choked flow, for example, is calculated by Equation 4 below as a mass flow rate q _w. In Equation 4, the mass flow rate q _w is calculated using the specific heat ratio γ ₀ , the air-fuel mixture density ρ ₀ , the speed of sound a ₀ , and the choke nozzle cross-sectional area A.
[Formula 4]

The molecular weight of the fuel and air, given the benefit of the air-fuel ratio lambda _0, it is possible to calculate the supply amount of gaseous fuel as the molar flow rate from the mass flow q _w, in step S6~ step S9, the mass flow rate q _w The calculation is equivalent to calculating the molar flow rate of the gaseous fuel supplied from the vaporization vessel 23 to the intake line 6.

Then, in step S10 to S12, by using a mass flow rate _{q w} such calculates the valve opening period Δt of the injection valve 24B.
First, in step S10, the number of moles n _{a1 of} air sucked into the combustion chamber 3 from the intake line 6 is calculated. The number of moles n _{a1 of} air can be calculated, for example, by applying the temperature T ₁ , the pressure P ₁ , and the volume V ₁ of the intake line 6 to the equation of state of the ideal gas.

The volume V ₁ can be defined as, for example, the total volume of the intake line 6 that is downstream of the throttle device 11 and upstream of the combustion chamber 3, and more specifically, the intake manifold 12. 3 includes the volume of the surge tank 13, all branch pipes 14, and the upstream piping of the surge tank 13.

Subsequently, in step S11, the air-fuel ratio λ _s required for fuel stoichiometric combustion is calculated as a molar ratio. This air-fuel ratio λ _s can be calculated by the following Equation 5 using the molar fraction α of oxygen in the air, _assuming that the fuel is equivalent to the hydrocarbon C _i H _j .
[Formula 5]

In step S12, the valve opening period Δt of the injection valve 24B is calculated using the following Equation 6.
[Formula 6]

In Equation 6, the molar flow rate of the mixture supplied by flowing from the vaporization vessel 23 to the intake line 6 together with the number of moles n _a1 , the volume V ₁ , the air-fuel ratio λ _s and the molar ratio r _f0 , the volume V ₂ of the combustion chamber 3. q _m is used. Further, the molar flow rate q _m can be calculated using the average molecular weight of the gas mixture in the vaporization vessel 23 and the mass flow rate q _w, and the average molecular weight of the gas mixture is determined by the molar ratio r _a0 , r _f0 , It can be calculated from the average molecular weight and the molecular weight of the fuel.

[Effects of Examples]
The fuel supply apparatus 1 of the embodiment includes a fuel vaporization means 5 having a vaporization container 23 that forms a space in which liquid fuel is vaporized, and a gaseous fuel supply means 7 that supplies gaseous fuel obtained by the fuel vaporization means 5 to an intake line 6. When, the first detection means 36 for detecting the temperature T ₀ and pressure P ₀ in the vaporization vessel 23, while providing a gaseous fuel into the intake line 6, the temperature T ₀ and are detected by the first detecting means 36 based on the pressure P _0, and a control unit 8 for controlling the injection valve 24B of the gaseous fuel supply unit 7.

As a result, the temperature T ₀ and the pressure P ₀ in the vaporization vessel 23 can be accurately detected, so that the substantial supply amount of gaseous fuel and air sucked into the combustion chamber 3 from the vaporization vessel 23 can be accurately grasped. can do. For this reason, since the supply amount of air required for combustion of gaseous fuel can be calculated | required correctly, a possibility that control of the internal combustion engine 2 may become unstable in the period which supplies gaseous fuel can be reduced.

Further, the fuel supply device 1 includes second detection means 37 for detecting the temperature T ₁ and the pressure P ₁ of the intake line 6, and the control means 8 is configured to supply the first fuel gas to the intake line 6 while supplying the first fuel. The injection valve 24B is controlled based on the temperatures T ₀ and T ₁ and the pressures P ₀ and P ₁ detected by the second detection means 36 and 37.
Thereby, since the substantial supply amount of the air supplied from the intake line 6 can be accurately grasped, the possibility that the control of the internal combustion engine 2 becomes unstable can be further reduced.

  The fuel vaporization means 5 is connected to the vaporization vessel 23 to introduce the atmosphere into the vaporization vessel 23, and the check valve 32 that is incorporated in the atmospheric introduction passage 31 and prevents backflow from the vaporization vessel 23. And have.

When the internal combustion engine 2 is started in the cold state, the inside of the vaporization vessel 23 corresponding to the supply pressure of the gaseous fuel can be used when the atmosphere cannot be introduced into the vaporization vessel 23 because the inside of the engine room is at a low temperature such as room temperature. The pressure P ₀ increases only up to the saturated vapor pressure P _sat of the fuel at normal temperature. For this reason, there is a possibility that the required amount of gaseous fuel cannot be supplied to the intake line 6.

Therefore, the fuel vaporization means 5 is provided so that the atmosphere can be introduced into the vaporization vessel 23 and the backflow from the vaporization vessel 23 to the atmosphere side can be prevented. Accordingly, prior to injecting the liquid fuel into the vaporization vessel 23, it is possible to increase the pressure P ₀ in the vaporization vessel 23 through the air introducing to a considerable atmospheric pressure. Therefore, by injecting liquid fuel into the vaporization vessel 23 having a pressure corresponding to atmospheric pressure, the pressure P ₀ in the vaporization vessel 23 is changed to a pressure equivalent to the atmospheric pressure, and a pressure equivalent to the saturated vapor pressure P _sat of the fuel. It can be increased to the added level.
As a result, since the supply pressure of the gaseous fuel can be increased even during cold start, a necessary supply amount of gaseous fuel can be supplied to the intake line 6.

[Modification]
The aspect of the fuel supply device 1 is not limited to the embodiment, and various modifications can be considered. For example, the liquid fuel supply means 4 of the fuel supply apparatus 1 according to the embodiment supplies liquid fuel to the combustion chamber 3 of the internal combustion engine 2, but liquid fuel may be supplied to the intake line 6. Further, the liquid fuel may be supplied without using the common rail 19.

Further, the second detection means 37 of the fuel supply device 1 of the embodiment is configured to be able to detect both the temperature T ₁ and the pressure P ₁ of the intake line 6, but the pressure P of the intake line 6 The second detection means 37 may be configured so that only _one can be detected.

That is, the range of the temperature of the air supplied from the intake line 6 is -20 to 60 ° C, and can be limited to a narrower range if the use region is determined. Therefore, by detecting only the pressure P ₁ in the intake line 6 and fixing it without detecting the temperature T ₁ , for example, the substantial supply amount of air supplied from the intake line 6 can be accurately grasped. be able to. For this reason, the number of necessary sensors constituting the second detection means 37 can be reduced.

  Further, the control means 8 of the fuel supply apparatus 1 of the embodiment calculates the valve opening period Δt of the injection valve 24B on the premise of stoichiometric combustion in the control relating to the supply of gaseous fuel. Alternatively, the valve opening period Δt may be calculated.

  Furthermore, although the fuel supply apparatus 1 of the embodiment supplies gasoline as fuel to the internal combustion engine 2, fuel other than gasoline such as light oil or liquefied petroleum gas may be supplied by the fuel supply apparatus 1.

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Internal combustion engine 3 Combustion chamber 4 Liquid fuel supply means 5 Fuel vaporization means 6 Intake line 7 Gaseous fuel supply means 8 Control means 23 Vaporization container 24A Injection valve 31 Atmospheric introduction path 32 Check valve 36 First detection means 37 Second detection means T ₀ temperature (temperature of vaporization container, detection value obtained by first detection means)
P ₀ pressure (pressure of vaporization container, detection value obtained by first detection means)
T ₁ temperature (the temperature of the intake line, the detection value obtained by the second detection means)
P ₁ pressure (intake line pressure, detection value obtained by second detection means)
λ ₀ air-fuel ratio (air-fuel ratio in the vaporization vessel)

Claims (8)

Liquid fuel supply means for supplying liquid fuel to either the combustion chamber of the internal combustion engine or the intake line leading to the combustion chamber of the internal combustion engine;
A vaporization container that forms a space in which the liquid fuel is vaporized, and a fuel vaporization means that has an injection valve that injects the liquid fuel into the vaporization container and vaporizes the liquid fuel to form a gaseous fuel;
Gaseous fuel supply means for supplying gaseous fuel obtained by the fuel vaporization means to the intake line;
First detection means for detecting the temperature and pressure of the vaporization vessel;
Second detection means for detecting the temperature and pressure of the intake line;
A fuel supply apparatus comprising: control means for controlling the gaseous fuel supply means based on detection values obtained by the first detection means and the second detection means while supplying gaseous fuel to the intake line. Liquid fuel supply means for supplying liquid fuel to either the combustion chamber of the internal combustion engine or the intake line leading to the combustion chamber of the internal combustion engine;
A vaporization container that forms a space in which the liquid fuel is vaporized, and a fuel vaporization means that has an injection valve that injects the liquid fuel into the vaporization container and vaporizes the liquid fuel to form a gaseous fuel;
Gaseous fuel supply means for supplying gaseous fuel obtained by the fuel vaporization means to the intake line;
First detection means for detecting the temperature and pressure of the vaporization vessel;
Second detection means for detecting the pressure in the intake line;
A fuel supply apparatus comprising: control means for controlling the gaseous fuel supply means based on detection values obtained by the first detection means and the second detection means while supplying gaseous fuel to the intake line . The fuel supply device according to claim 1,
The fuel vaporization means includes an air introduction path that is connected to the vaporization container and introduces the atmosphere into the vaporization container, and a check valve that is incorporated in the air introduction path and prevents a backflow from the vaporization container. A fuel supply device. The fuel supply device according to claim 2 ,
The fuel vaporization means includes an air introduction path that is connected to the vaporization container and introduces the atmosphere into the vaporization container, and a check valve that is incorporated in the air introduction path and prevents a backflow from the vaporization container. A fuel supply device. Liquid fuel supply means for supplying liquid fuel to either the combustion chamber of the internal combustion engine or the intake line leading to the combustion chamber of the internal combustion engine;
A vaporization container that forms a space in which the liquid fuel is vaporized, and a fuel vaporization means that has an injection valve that injects the liquid fuel into the vaporization container and vaporizes the liquid fuel to form a gaseous fuel;
Gaseous fuel supply means for supplying gaseous fuel obtained by the fuel vaporization means to the intake line;
First detection means for detecting the temperature and pressure of the vaporization vessel;
Control means for controlling the gaseous fuel supply means based on the detection value obtained by the first detection means while supplying gaseous fuel to the intake line;
The fuel vaporization means includes an air introduction path that is connected to the vaporization container and introduces the atmosphere into the vaporization container, and a check valve that is incorporated in the air introduction path and prevents a backflow from the vaporization container. A fuel supply device. Liquid fuel supply means for supplying liquid fuel to either the combustion chamber of the internal combustion engine or the intake line leading to the combustion chamber of the internal combustion engine;
A vaporization container that forms a space in which the liquid fuel is vaporized, and a fuel vaporization means that has an injection valve that injects the liquid fuel into the vaporization container and vaporizes the liquid fuel to form a gaseous fuel;
Gaseous fuel supply means for supplying gaseous fuel obtained by the fuel vaporization means to the intake line;
First detection means for detecting the temperature and pressure of the vaporization vessel;
Control means for controlling the gaseous fuel supply means based on the detection value obtained by the first detection means while supplying gaseous fuel to the intake line;
This control means calculates the air-fuel ratio in the said vaporization container based on the detected value obtained by the said 1st detection means, The fuel supply apparatus characterized by the above-mentioned . In the fuel supply device according to any one of claims 1 to 5,
The fuel supply apparatus according to claim 1, wherein the control means calculates an air-fuel ratio in the vaporization container based on a detection value obtained by the first detection means . The fuel supply device according to claim 6 or 7,
A second detecting means for detecting the temperature and pressure of the intake line or the pressure of the intake line;
The control means calculates a flow rate of gaseous fuel supplied from the vaporization container to the intake line based on detection values obtained by the first detection means and the second detection means. .

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