JPS5815734A - Fuel feed device in internal-combustion engine - Google Patents

Abstract

PURPOSE:To operate an engine with a low output in a constant air-fuel ratio at abnormal time, by providing a carburetor for use at the abnormal time separately from an air feed quantity control system operated at normal time. CONSTITUTION:When a trouble is caused in a throttle valve actuator 9 or a control unit 10 itself, an alarm is generated, and a switch is operated to cut off a power source to the control unit 10 and close the first throttle valve 2. In this condition of an engine, a cock 19 is opened to deliver fuel from a Venturi part, and in accordance with depression of an accelerator pedal, the second throttle valve 3 is operated to feed a mixture of fixed air-fuel ratio to the engine and perform low output operation.

Description

[Detailed description of the invention] The present invention relates to a fuel supply device for a ignited internal combustion engine.

To control the air/dry ratio supplied to the engine,
Usually a carburetor or an electronically controlled fuel injection system (IFI)
) are used, but in each case, the air amount is determined independently or preferentially as an initial value, and the corresponding fuel is calculated dependently. In this air-priority fuel supply control system based on CIFC), it is difficult to achieve both fuel economy and fuel concentration. Since the density of fuel is greater than that of air, the step response will be delayed, and in the acceleration state, the throttle valve front and rear pressures will have a large value until the time of the step change. In such a case, correction must be made in order to keep the air-fuel mixture in the combustion base within the flammable range KJI.

Therefore, the inventors of the present invention first developed a fuel command I tension system that detects the amount of depression of one accelerator pedal, an air fuel sensing device in the intake IA, and an I tension sensor connected to the STATORNORD actuator. The output from a control element such as a pan meter, and the electric signal from a correction element such as engine coolant temperature, atmospheric concentration, fuel supply line pressure, etc. are input to the control unit, and the function between the control element and the correction element pan meter is inputted to the control unit. The fuel priority air supply amount control (5K) operates the throttle valve based on the required air amount calculated from the fuel flow input and determines the optimal value of the air amount, compared with the pre-programmed memory based on the relationship. Invented a fuel supply system by ICAC) K. In such a system,
There is little delay in both the rise and fall of fuel, and the mixture ratio supplied to the fuel chamber can be easily selected and programmed, making it especially suitable for urban driving of vehicles that frequently accelerate and decelerate. Fuel efficiency is greatly improved, and it becomes easier to trawl.

However, in the system of the above invention, [when the throttle A valve actuator or control unit becomes defective for some reason and does not operate normally, the engine stops and the vehicle cannot run on its own. In view of the above points, the present invention provides a fuel supply system using fuel-priority air supply amount control. The second throttle valve is installed in the second part, and the second throttle valve is directly rotated by the movement of the bench gourd and the accelerator pedal.
Arrange the fuel passage that communicates with IK! When an abnormality occurs such as engine failure, the first throttle valve is closed, and the second throttle valve is switched to carburetion 11, which is proportional to the amount of depression of the accelerator pedal. For example, the air-fuel ratio is adjusted to supply a constant air-fuel mixture.In other words, under normal conditions, the variable E
AC control is performed, and when the control unit or actuator fails, air priority control is performed using the carburetor 11, allowing the vehicle to run at low output to the service stage or drive-in area, etc., without stopping the engine. It is a reserve.

Next, the OIt diagram for explaining the embodiment of the present invention with reference to the drawings shows a twin body in the middle of intake 7 (1), It throttle valve (2), and Throttle valve 12 (m).
are installed respectively, and a solenoid valve type injector (4) is placed downstream of the throttle valve. Injector (4)
The intake manifold is not limited to a single four-point injector as shown in the figure, but may be a single multi-point injector installed in each intake manifold. Note that the injector is an electromagnetic valve type injector that increases or decreases the amount of fuel injected by changing the valve opening time width using a solenoid drive current. The main injector is supplied with fuel from the regulator, the fuel supply pressure is detected by the senna in the return passage, and the surplus is returned to the fuel tank (not shown) via the relief nozzle.

The movement of the accelerator pedal (5) moved by the operator is detected by the fuel command f tension meter (7) via the linkage (6), and the output voltage according to the amount of pedal depression is output to the control & control wheels. - An intake air temperature sensor I is provided in IA downstream of the air cleaner (8), and a pressure sensor υ (to) that constitutes the air 7w-sensing noise is provided upstream and downstream of the throttle valve (2). - As correction elements, the intake air temperature sensor (6), a fuel supply pressure sensor, an engine coolant concentration sensor, an engine rotation sensor, etc. are arranged. Furthermore, Control and Etsutosuke are Fuel Command F/? Pressure meter (7), Air 7-17 cylinder α2Ql, Throttle valve actuator (11)
) The output from the K-coupled f-tensile meter or encoder, etc. and the electrical signals from various correction elements are input, and compared with the pre-programmed memory, the fuel flow rate - the required air calculated from the input is calculated. Based on the amount of air, the actuator (9) such as a DC motor or stepping motor is operated to determine the optimal value of the air amount by operating the throttle valve (2). Inside, the Totokupe/Cherry part α℃ shown in the figure is formed, and the outside is 71m-)! (2
), and a fuel passage (2) having a hole (a-) is provided from the float chamber to the venturi portion to constitute a carburetor. The second throttle valve (3) may directly operate the movement of the accelerator pedal (6) via the Red Co., Ltd., and when the control unit (G) etc. fails, the second throttle valve (3)
Clutch (2) which becomes N may be operated with a valve.

When the control unit (G) in the above device is operating normally, it supplies a variable and appropriate air-fuel mixture depending on the operating conditions of the engine as the vehicle travels. actinie/(
If 9) becomes defective, or if 1. or the control unit itself malfunctions, an alarm will be issued, the switch will be operated to cut off the power to the control unit, and the 1.
Close the throttle valve (3). When this condition occurs, open cock 1 and operate the throttle valve (3) according to the amount of pedal depression to discharge fuel from the pentagonal part. A constant mixture is supplied to the engine, the engine is operated at low output, and the vehicle is run until it reaches a service stage or the like.

FIG. 3 shows another example, in which a small-lid carburetor is attached to the side of the throttle valve (2) mounting part of the take (1). The carburetor gas cylinder (2) in front of and behind the suttattornorubu (2)
The population (2) and the exit (goods) are opened, and the 0 gas cylinder (to), which tightens and fixes the carburetor body to the air through the 7 lunge penalty kick bolt (2) formed near it, is a disgusting υ character. It is bent into a shape, with a pentieri part formed inside it, and a fi
k? I am wearing Zo's Sputtorno Serve (3).

A float chamber (2) is integrally provided in the upper part of the air cylinder, a fuel passage (2) is formed from the float chamber to the venturi part, and a needle valve (turnover) for opening and closing is arranged above the fuel passage (2). ing. Vaporization ss@ is flange (2)
-A (1) by simply passing and tightening the /Ruto (Company) part.
) is easy to assemble, and it is also convenient to remove and replace in the event of a defect.

Also in the case of the embodiment shown in Fig. 2, when the air intake unit is operating normally, the air supply amount is controlled by the output of the actuator (9), and the air-fuel mixture is optimally adjusted for the operating conditions of the engine. If a problem occurs with the attenuator or the F-NOTROL unit for some reason, K closes the main suit tornouge and at the same time energizes the solenoid to open the fuel passage. If you press the accelerator pedal (!S) in this condition, the movement of the accelerator pedal will be directly transmitted to the slit A lubricant (3) K, which will maintain a constant air-fuel mixture. It can be supplied to the engine 2 to perform low output operation.

As mentioned above, according to the present invention, an air supply control system using fuel priority air supply control is provided, which is different from an air supply control system operated by control values from a control unit.

It is equipped with a vaporizer for emergencies,
In the event of a failure in the control and control actuator I, the vehicle can be operated safely by switching to the carburetor system and enabling operation at a constant low output without abruptly stopping the engine. can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of the device of the present invention, and Fig. 2 is a system diagram of another embodiment. ): Accelerator pedal (7) Small ffi charger/Do 4 Te/Seal meter (9)
! 77? Any/QQs Control Unit Co., Ltd.
Seismic intake air temperature sensor (LIQ3: Air 7p-sensor bowl 8 fuel supply sensor Q5 is engine cooling water temperature sensor, aSS engine speed sensor a7): Venturi section DI g 7 El -) 宸 al; Fuel passage @ 8 carburetor 3-Kogyo Co., Ltd. Tomi Narijo Agent Ashi 1) Naoe Agent Masayuki Asakura Procedural Amendment (Voluntary) September 10, 1932 To the Commissioner of the Japan Patent Office (To the Patent Office Examiner) 1. Indication of the case 1939 Patent Application No. 112269 2, Invention O Name Fuel Supply Device for Internal Combustion Engine 3, Person making amendment Patent #B 11 people 3-Kogyo Co., Ltd. (1 other person) 4, Generation
Rijin Showa year month day 6, subject of amendment (21tlllla book INB page 7 line ``parameter'' was changed to ``parameter''
Correct with parameter J〇(3) Same book, page 7, line 13-ls “As shown...
...The J installed inside the cylinder is not limited to the single-point injector type shown in the figure, but it is also possible to install several. (4) On page 7 of the same book, lines 17-1s, “change” should be changed to “
Correct it to J by changing the valve opening frequency. Claims (1) A fuel command potentiometer equipped with a fuel injector and a fuel injector with an electronic calculation function, which detects the amount of accelerator pedal depression, an air flow sensing device in the data bore, and a suit. The output from a control element such as a potentiometer or encoder coupled to the torque pulse actuator and electrical signals from various correction elements are input to the control unit, and the function between the parameters of the control element and correction element is calculated. In a device that operates the throttle valve based on the required air amount calculated from the fuel input and compares it with a pre-programmed memory based on the relationship, the information bore is determined. It is a twin-hulled body, and the O-bore is equipped with the control unit) 0.
a first throttle valve rotated by the operation of a throttle pulp actuator based on a control value;
The other bore is provided with a bench area, a fuel passage for discharging fuel from the foot chamber into the bench area, and a second throttle valve that is rotated directly by depression of the accelerator pedal. A fuel supply device for an internal combustion engine, characterized in that it is capable of supplying a mixture with a constant air-fuel ratio in the event of an injector failure. (2) The fflN passage has a valve that is closed when the control unit or the throttle valve actuator is operating normally and is opened when an abnormality occurs! The fuel supply device according to item III. (3) The correction elements include engine cold water temperature or engine cylinder head temperature, engine speed, atmospheric temperature,
Claim # which is a senna group of atmospheric pressure conditions, fuel supply line pressure, etc.! The fuel supply device for an internal combustion engine according to item 1. (4) The air flow sensing device detects by the pressure difference before and after the throttle pulp, the electrical output proportional to the amount of intake air, the Karman vortex, the output by frequency control such as ultrasonic waves, etc. Claim 1 A fuel supply device for an internal combustion engine as described in 2. (5) The fuel injectors controlled by the main control unit may be one or more in a single injector type downstream of the intake manifold, or one or more injectors in a single injector type downstream of the intake manifold, or two cylinders in a multipoint injector type in the intake manifold. Each X number of I! #Scope of Claims The internal combustion engine Ro fuel supply device according to claim 1.

Claims (1)

[Claims] (1) A fuel command intensity meter, an intake I, which is equipped with a fuel injector and a control unit with an electronic calculation function, and detects the amount of depression of the accelerator pedal.
Outputs from control elements such as an airflow sensing device and a slit connected to a noservo actuator, such as an f-tension meter or an encoder, and electrical signals from various correction elements are input to the control unit; The function relationship between the parameters of the control element and correction element is compared with a memory stored in a zologram in advance, and the throttle norde is operated based on the required air amount calculated from the 70-I/P of the fuel. In a device designed for 5K to determine the distance, the informator is a twin body, and one of the inverters is equipped with a first slot that is rotated by the operation of a switch adjuster based on the control value of the control unit. j I/A router is installed, and the other one has a pentier eri part and a fuel passage that discharges fuel from the foot to the pliers; 5 to 1. The second throttle A# is arranged so that a mixture with a constant air-fuel ratio can be supplied in the event of a malfunction of the unit or injector. A fuel supply system for an internal combustion engine, characterized in that the fuel passage is connected to a control unit or a sp
The fuel supply device according to claim 1, which has a valve that is closed when the torque AA/f actuator is operating normally and opened when an abnormality occurs. (3) The correction element is , engine cold water concentration or engine cylinder head temperature, engine speed, atmospheric temperature, atmospheric pressure state, fuel supply twin pressure, etc. (4) Air 70-Ryu/Singday A chair is detected by the pressure difference before and after S4T J4/A Ruzo, electrical output proportional to the amount of intake air, Karman vortex, output by variable frequency such as ultrasonic waves, etc. Claims that are
! Fuel supply system for an internal combustion engine as described in paragraph 1 (6) The fuel injector controlled by the main control unit shall be controlled by the main control unit. The fuel supply system for an internal combustion engine according to claim 1, wherein the fuel supply system for an internal combustion engine according to claim 1 is installed in the intake manifold.