KR20030031034A - An electro-controlled injection type engin system for a motorcycle - Google Patents

Abstract

PURPOSE: An electro-controlled injection type engine system is provided to achieve improved engine performance and prevent waste of fuel, while lengthening lifespan of the engine and preventing air contamination. CONSTITUTION: An electro-controlled injection type engine system comprises an injector(3) arranged in rear of a throttle valve(2) of an intake pipe(1); a flow sensor(4) arranged in front of the throttle valve so as to detect the amount of intake air; a temperature sensor(6) mounted on a cylinder block(5) so as to detect temperature of an engine; an encoder(8) mounted on an end of a crank shaft so as to detect position of a piston(7) and RPM; an oxygen sensor(9) mounted within an exhaust pipe so as to detect the amount of oxygen in the exhaust gas; and an electronic control unit(10) for performing an arithmetic operation on the values output from the flow sensor, encoder and the oxygen sensor, and controlling fuel amount and ignition timing in accordance with the result of the arithmetic operation.

Description

An electro-controlled injection type engin system for a motorcycle

The present invention relates to an engine system for a two-wheeled vehicle, and more particularly, to employ an injection type fuel system other than the conventional carburetor type, and to install various sensors for detecting the state of each part of the engine system, and according to the value detected therefrom. Equipped with an electronic control unit (ECU) to control the ignition and ignition timing, engine performance and fuel economy are improved, leading to optimal engine performance according to the surrounding environment and operating conditions, and greatly helping to clean the exhaust gas. An electronically controlled injection engine system for a two-wheeled vehicle that implements combustion.

In general, the engine of a two-wheeled vehicle has a venturi tube installed at an upper part of a throttle valve in a fuel system, and continuously extracts and mixes fuel in a float chamber using a vacuum pressure generated when air passes through the venturi tube. After the gas is formed, a vaporization scheme is used to supply it to the cylinder.

However, such a carburetor engine has a low engine performance due to a large flow resistance of the air by the venturi unit, and it is difficult to accurately adjust the air-fuel ratio according to the engine speed, the load, or the opening of the throttle valve. In two-stroke engines, mixed gas is often escaped as it is during scavenging, which leads to waste of fuel, and in case of deceleration, a concentrated gas is always formed, which is contrary to fuel waste and clean exhaust gas. There are many problems such as a long cylinder arrival time of the fuel and a responsiveness when the throttle valve is opened quickly, that is, acceleration. In particular, air pollution through exhaust gas of two-wheeled vehicles has been reported to be more severe than that caused by four-wheeled vehicles.

In addition, the engine system of the conventional two-wheeled vehicle as described above is not provided with an electronic control unit that detects the state of each part of the engine system and adjusts the fuel amount and the ignition timing according to the result value and the user's input conditions. However, there is a problem that can not derive the optimum engine performance according to the operating conditions.

The present invention has been made to solve the conventional problems as described above, improve the fuel economy, derive the optimum engine performance according to the ambient environment or operating conditions, greatly help in the purification of exhaust gas, the implementation of abnormal combustion To provide an electronically controlled injection engine system for a two-wheeled vehicle having an engine for injection, and having an electronic control unit for controlling each part of the engine in accordance with various sensors for controlling the engine system and detection values from these sensors and user input conditions. The purpose is.

1 is a configuration diagram of an engine system according to a preferred embodiment of the present invention.

2 is a block diagram of the present invention

<Description of the symbols for the main parts of the drawings>

1 Intake pipe 2 Throttle valve 3 Injector

4 sensor for flow meter 5 cylinder block 6 temperature sensor

7: piston 8: encoder 9: oxygen sensor

10 electronic control unit 11 cylinder head 12 fuel pump

13 fuel tank 14 fuel filter 15 throttle valve switch

Hereinafter, the configuration and operation according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an engine system according to a preferred embodiment of the present invention, and FIG. 2 is a block diagram of the present invention.

As shown in FIG. 1, the present invention is a conventional two-wheeled engine system composed of an intake pipe, an exhaust pipe, a spark plug, a cylinder, a piston, a crankshaft, and the like. Injector (3) installed behind the throttle valve (2), flowmeter sensor (4) installed in front of the throttle valve (2) for the detection of the intake air volume, and cylinder block (for detecting the temperature of the engine) 5), a temperature sensor 6 installed at the piston, an encoder 8 installed at one end of the crankshaft for detecting the position and RPM of the piston 7, and an oxygen sensor installed inside the exhaust pipe for detecting the amount of oxygen in the exhaust gas. 9) and an electronic control unit 10 which calculates the detection values from the flowmeter sensor 4 and the encoder 8 and the oxygen sensor 9 and adjusts the fuel amount and the ignition timing as a result thereof. It features.

The injector 3 may be installed inside the cylinder head 11 in some cases, and in this case, it is possible to perform layered combustion that locally forms a layered mixed gas in the vicinity of the spark plug, thereby allowing combustion. It is possible.

The electronic control unit 10 is provided with a microcomputer for setting the air-fuel ratio, the operating engine temperature, the amount of oxygen in the exhaust gas, etc. by the user.

In the figure, reference numeral 13 denotes a fuel tank, 14 denotes a fuel filter, and 15 denotes a throttle valve switch.

As described above, the present invention provides an injector 3 instead of a conventional carburetor, so that the engine performance is improved due to the absence of air flow resistance, and thus the engine speed, load, or opening degree of the throttle valve 2. Accurate adjustment of the appropriate air-fuel ratio according to this can be made easily.

While the air passing through the air filter passes through the throttle valve 2 of the intake pipe 1, the flow sensor 4 detects the intake air amount and sends the value to the electronic control unit 10. The unit 10 thus controls the amount of fuel injected by opening and closing the injector 3 so as to be the air-fuel ratio set by the user. As a result, an appropriate air-fuel ratio can be achieved, thereby improving fuel consumption rate and inducing ideal combustion.

Fuel of a predetermined pressure is supplied to the injector 3 by the fuel pump 12, and the electronic control unit 9 controls the speed of the motor in the fuel pump 12 to supply the fuel injected from the injector 3. To control the pressure.

The mixed gas moved to the in-cylinder combustion chamber is burned by the ignition of the spark plug according to the control of the electronic control unit 10 to reciprocate the piston 7, and the reciprocating motion of the piston 7 is connected to the connecting rod and the crank arm. This will change the rotation of the crankshaft. Here, the encoder 8 is installed by extracting one end of the rotating shaft of the crankshaft to detect the crank angle and RPM, and the encoder 8 detects the crank angle and RPM and sends the value to the electronic control unit 10. The electronic control unit 10 controls the ignition timing of the ignition plug according to the received crank angle value so that accurate ignition is achieved, and also compares the received RPM value with the user-set RPM value to open and close the throttle valve 2. By adjusting the fuel injection amount of the injector 3, the engine is accelerated or decelerated.

The burned exhaust gas is discharged into the atmosphere through an exhaust pipe and a silencer. At this time, an oxygen sensor 9 is installed at one point in the exhaust pipe to detect the amount of oxygen in the exhaust gas and send the value to the electronic control unit 10. Then, the electronic control unit 10 compares this with the user set value to adjust the fuel injection amount of the injector (3). This leads to ideal combustion of the mixed gas and greatly contributes to the purification of the exhaust gas.

On the other hand, by installing the temperature sensor 6 in the cylinder block 5, the temperature of the cylinder block 5 is detected and sent to the electronic control unit 10, and the electronic control unit 10 has a value set by the user. When it reaches to stop the ignition of the spark plug to stop the engine operation to prevent damage to the engine by overheating.

Thus, the present invention employs a non-carbureted injection engine, thereby improving engine performance and preventing fuel waste, and by providing various sensors and electronic control units in the engine system, the engine is optimized according to the surrounding environment and operating conditions. It leads to performance and is especially helpful for the cleanup of exhaust gas and by implementing abnormal combustion, it has the effect of extending engine life, reducing fuel cost and preventing air pollution.

Claims (2)

In a conventional two-wheeled vehicle engine system consisting of an intake pipe, an exhaust pipe, a spark plug, a cylinder, a piston, a crankshaft, and the like, it is installed at the rear of the throttle valve 2 of the intake pipe 1 based on the movement direction of air and fuel. The injector 3, the flow meter sensor 4 installed in front of the throttle valve 2 to detect the intake air amount, and the temperature sensor 6 installed in the cylinder block 5 to detect the temperature of the engine. And an encoder (8) installed at one end of the crankshaft for detecting the position and RPM of the piston (7), an oxygen sensor (9) installed inside the exhaust pipe for detecting the amount of oxygen in the exhaust gas, and the sensor for the flow meter (4). ) And an electronically controlled injection engine for a two-wheeled vehicle characterized in that it comprises an electronic control unit (10) which calculates the fuel value and the ignition timing as a result of calculating the detected values from the encoder (8) and the oxygen sensor (9). system. 2. The electronically controlled injection engine system for a two-wheeled vehicle according to claim 1, wherein the injector (3) is installed inside the cylinder head (11).