KR20100090589A - Electronic control unit for dual fuel system - Google Patents

Abstract

PURPOSE: An electronic control unit for a dual fuel system is provided to reduce costs and an installation space because the injection amount of diesel and gas fuel is automatically controlled by means of a controller and an output processing unit. CONSTITUTION: An electronic control unit for a dual fuel system comprises an input processing unit(101), a controller(102), an output processing unit(103), and a power supply unit(104). The input processing unit is connected to the sensor, and converts and provides sensing signals detected by the sensing unit. The sensing unit comprises a speed sensor, an engine RPM sensor, a water temperature sensor, a throttle position sensor, a pressure sensor, an oxygen sensor, a temperature sensor, and a knock sensor. The controller processes the sensing signals and produces control signals. The output processing unit is connected to a drive unit. The drive unit comprises a shutoff valve, an injector, and a governor actuator, a display switch, and a communication device.

Description

Electronic control unit of mixed fuel system {ELECTRONIC CONTROL UNIT FOR DUAL FUEL SYSTEM}

The present invention relates to a mixed fuel system using a diesel fuel and a gas fuel, and more particularly, to an electronic control apparatus of a mixed fuel system for controlling the injection amount of the fuel provided to the engine.

In general, a diesel engine has an advantage of obtaining a larger output than a gasoline engine or a gas engine, but a large amount of exhaust gas is emitted compared to a gasoline engine or a gas engine, and nitrogen oxides or sulfur oxides mixed with the exhaust gas are emitted. There is a problem of environmental pollution, it is economically disadvantageous compared to gas fuel such as LPG or LNG. In order to overcome such problems of diesel engines, in particular, environmental problems, research into technologies for converting into mixed fuel systems is being actively conducted.

In addition, the general mixed fuel system is a direct control of the input and output sensor signals from the diesel engine's electric control unit (electric control unit) without modification, and includes an electronic control device for a separate gas fuel. The electronic control device for gas fuel also includes an intake air flow control device in the intake air flow path to improve the combustion stability and efficiency of the intermixed engine by adjusting the intake air flow rate separately from the combustion stability using the fuel injection amount control in the mixed gas engine. do.

However, the mixed fuel system using a diesel engine requires an electronic control device for the gas fuel at the same time the cylinder shape is changed, there is a problem that increases in terms of cost and installation space. In addition, there is a hassle to select the fuel supplied to the engine by using a switch.

The present invention is to provide an electronic control apparatus of a mixed fuel system that can control the injection amount to the engine without the distinction between diesel fuel and gas fuel.

In addition, the present invention is to provide an electronic control device of a mixed fuel system that can reduce the cost and installation space.

In addition, the present invention is to provide an electronic control device of a mixed fuel system that can control the injection amount to the engine without a separate operation.

The present invention is a mixed fuel system for providing diesel fuel and gas fuel to the engine, the detection unit including a speed sensor, engine speed sensor, water temperature sensor, throttle position sensor, pressure sensor, oxygen sensor, temperature sensor and knock sensor An input processing unit connected to and converting and providing a sensing signal detected through the sensing unit; A controller configured to process and convert the sensed signal provided from the input processor to generate and provide a control signal; An output processor connected to a driving unit including a shutoff valve, an injector, a governor actuator, a display switch, and a communication device, and receiving the control signal from the control unit to control the driving unit; And a power supply unit supplying current to the input processing unit, the control unit, and the output processing unit, wherein the amount of the gas fuel provided to the engine is automatically controlled according to the detection signal detected through the detection unit. An electronic control apparatus for a mixed fuel system is disclosed.

In addition, the input processing unit, the speed detection circuit for converting the detection signal for the speed of the engine in the form of a square wave detected by the speed sensor in the form of a voltage; An engine speed detection circuit for converting the detection signal of the sinusoidal engine speed detected by the engine speed sensor into a voltage form; A water temperature detection circuit for setting the detection signal for the coolant temperature of the engine detected by the water temperature sensor to a resistance value; A throttle position detection circuit for setting the detection signal for the opened degree of the accelerator detected by the throttle position sensor to a resistance value; A pressure detection circuit for setting the detection signal for the inflow passage pressure of the gas fuel sensed by the pressure sensor to a resistance value; An oxygen detection circuit for amplifying and filtering the detection signal for the amount of oxygen in the exhaust port sensed by the oxygen sensor and comparing it with a reference oxygen amount in the exhaust port; A temperature detection circuit for setting the detection signal for the internal temperature of the vaporizer detected by the temperature sensor to a resistance value; And a knock signal detection circuit for amplifying and filtering the detection signal for the pressure inside the engine sensed by the knock sensor to detect whether the engine is abnormally vibrated. Start the device.

The output processor may include a valve driving circuit connected to the shutoff valve and opening and closing the shutoff valve; An injection driving circuit connected to the injector and controlling the injector by the PWM method to control the injection amount of the gas fuel; A governor driving circuit connected to the governor actuator and controlling the injection amount of the diesel fuel by controlling the governor actuator in a PWM manner; A display driving circuit connected to the display device and configured to display an amount of fuel injected into the engine or display a type of fuel injected into the display device; And a communication signal processing circuit connected to the communication device and converting a signal to confirm a state of the electronic control device or to control the electronic control device through the communication device. Disclosed is an electronic controller of a system.

Also, when the valve driving circuit opens the shutoff valve, the injection driving circuit discloses an electronic control apparatus for a mixed fuel system, characterized in that to enable the gas fuel to be injected through the injector.

The electronic control apparatus may further include a switching switch for selecting one of a diesel fuel mode and a mixed fuel mode, and selecting a type of fuel injected into the engine, wherein the switching switch selects the mixed fuel mode. And the shut off valve is opened.

In addition, in the state in which the temperature of the cooling water of 40 ° C or more is sensed by the water temperature sensor, the engine speed detected by the engine speed sensor and the degree of opening of the accelerator detected by the throttle position sensor The injection driving circuit discloses an electronic control apparatus for a mixed fuel system, characterized in that for controlling the amount of the gas fuel injected through the injector.

In addition, as the engine speed and the degree of opening of the accelerator increase, the injection driving circuit increases the amount of the gas fuel injected into the engine through the injector. Start the control unit.

In addition, as the inflow passage pressure of the gas fuel sensed by the pressure sensor increases, the injection driving circuit increases the amount of the gas fuel injected into the engine through the injector, mixed fuel system, characterized in that Disclosed is an electronic control apparatus.

In addition, when the abnormal vibration of the engine is detected through the knock sensor, the injection driving circuit electronic control device of the mixed fuel system, characterized in that for reducing the amount of the gas fuel injected into the engine through the injector Initiate.

In addition, when it is detected that the opening degree of the accelerator is drastically reduced through the throttle position sensor, the injection driving circuit is characterized by blocking the gas fuel injected into the engine through the injector Disclosed is an electronic controller of a fuel system.

In addition, when the engine speed corresponding to the idle speed of the engine is sensed through the engine speed sensor, the injection driving circuit is mixed fuel, characterized in that to block the gas fuel injected into the engine through the injector Disclosed is an electronic controller of a system.

The communication device may be a computer or a terminal in which PC communication or RS232 communication is performed with the electronic control device, a dedicated software of the electronic control device may be installed, and the state of the electronic control device may be confirmed. Disclosed is an electronic control apparatus for a mixed fuel system, wherein the operation of the control apparatus can be set.

The electronic control apparatus of the mixed fuel system according to the present invention includes an input processor, a controller, an output processor, and a power supply, and converts a detected signal through an input processor connected to a plurality of sensors to perform diesel fuel and The injection amount of the gas fuel is automatically controlled through the controller and the output processor. As a result, an electronic control device for injecting diesel fuel and gas fuel does not need to be separately provided, thereby reducing costs and installation space.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram illustrating an electronic control apparatus 100 of a mixed fuel system according to a preferred embodiment of the present invention, and FIG. 2 is a sensing unit 200 of the electronic control apparatus 100 of the mixed fuel system shown in FIG. 1. ) Is a block diagram illustrating a state connected to the driving unit 300, and FIG. 3 is a diagram illustrating a mixed fuel system 10 including the electronic controller 200 illustrated in FIG. 1. 1 to 3, the electronic control apparatus 100 of the mixed fuel system according to the preferred embodiment of the present invention includes an input processor 101, a controller 102, an output processor 103, and a power supply 104. Including,), the mixed fuel system 10 for providing a diesel fuel and a gas fuel to the engine 401 to control the amount of gas fuel is injected.

The input processor 101 includes a speed sensor 201, an engine speed sensor 202, a water temperature sensor 203, a throttle position sensor 204, a pressure sensor 205, an oxygen sensor 206, and a temperature sensor 207. And a sensing unit 200 including sensors such as the knock sensor 208, and converts and provides a sensing signal sensed through the sensing unit 200. In addition, the input processor 101 includes a speed detecting circuit 111, an engine speed detecting circuit 112, a water temperature detecting circuit 113, a throttle position detecting circuit 114, a pressure detecting circuit 115, and an oxygen detecting circuit ( 116, the temperature detection circuit 117 and the knock signal detection circuit 118, and converts the signals detected from the respective sensors into a controllable form.

The speed detection circuit 111 is connected to the speed sensor 201 for detecting the speed of the engine 401. The detection signal for the speed of the engine 401 is detected by the speed sensor 201 in the form of a square wave, and the speed detection circuit 111 converts the detected detection signal into a voltage form.

The engine speed detection circuit 112 is connected to the engine speed sensor 202 for detecting the rotation speed of the engine 401 according to the operation of the engine 401. The detection signal for the rotational speed of the engine 401 is detected by the engine speed sensor 202 in the form of a sine wave, and the engine speed detection circuit 112 converts the detected detection signal into a voltage form.

The water temperature detection circuit 113 is connected to the water temperature sensor 203 for detecting the temperature of the coolant for cooling the engine 401. The detection signal for the coolant temperature of the engine 401 is detected through the water temperature sensor 203, and the water temperature detection circuit 113 sets this as a resistance value. At this time, the resistance value is an analog form.

The throttle position detection circuit 114 is connected to a throttle position sensor 204 that senses the opening degree of the accelerator 402. The detection signal for the open degree of the accelerator 402 is detected through the throttle position detection sensor 204, and the throttle position detection circuit 114 sets it as a resistance value. At this time, the resistance value is an analog form.

The pressure detection circuit 115 is connected to the pressure sensor 205 for detecting the pressure of the inflow passage 403 of the gas fuel. The detection signal for the pressure of the inflow passage 403 of the gas fuel is detected through the pressure sensor 205, the pressure detection circuit 115 sets the resistance value of the detected detection signal. At this time, the resistance value is an analog form.

The oxygen detection circuit 116 is connected to the oxygen sensor 206 for detecting the amount of oxygen in the exhaust port. The detection signal for the oxygen amount of the exhaust port is detected by the oxygen sensor 206, the oxygen detection circuit 116 amplifies and filters it and compares it with the reference oxygen amount of the exhaust port. In the oxygen detection circuit 116, a comparator process is performed.

The temperature detection circuit 117 is connected to the temperature sensor 207 for detecting the temperature inside the vaporizer 404. The detection signal for the internal temperature of the vaporizer 404 is detected through the temperature sensor 207, the temperature detection circuit 117 sets the detected detection signal as a resistance value. At this time, the resistance value is an analog form.

The knock signal detection circuit 118 is connected to the knock sensor 208 for detecting the pressure inside the engine 401. The detection signal for the pressure inside the engine 401 is detected through the knock sensor 208, the knock signal detection circuit 118 amplifies and filters the detected detection signal to detect whether the engine 401 abnormal vibration. . The knock signal detection circuit 118 performs integrator processing.

The controller 102 receives and processes the detected detection signal from the input processor 101. As a result, a control signal may be generated by the controller 102 and provided to the output processor 103. In addition, the control unit 102 is manufactured in the form of a microprocessor. That is, the controller 102 may process the converted detection signal and operate the mixed fuel system 10 according to the detection signal. In particular, the injection amount of the gaseous fuel to the engine 401 is controlled.

The output processor 103 is connected to a drive unit 300 including a shutoff valve 301, an injector 302, a governor actuator 303, a display device 304, and a communication device 305. The control unit 300 is controlled by receiving a control signal from the 102. In addition, the output processing unit 103 includes a valve driving circuit 131, an injection driving circuit 132, a governor driving circuit 133, a display driving circuit 134, and a communication signal processing circuit 135.

The valve driving circuit 131 is connected to the shutoff valve 301. The shutoff valve 301 may select whether the gas fuel is discharged from the gas tank 405. Accordingly, the valve driving circuit 131 realizes the discharge of the gas fuel from the gas tank 405 by opening and closing the shutoff valve 301.

The injection drive circuit 132 is connected to the injector 302. The injector 302 controls the gas fuel supplied from the gas tank 405 to the engine 401. In addition, the injection driving circuit 132 controls the injector 302 in a PWM manner to control the injection amount of the gas fuel. In addition, the injection driving circuit 132 may operate in a state in which gas fuel is discharged from the gas tank 405 as the shutoff valve 301 is opened. Therefore, when the valve driving circuit 131 opens the shutoff valve 301, the injection driving circuit 132 can not only inject the gas fuel through the injector 302, but also control the amount of gas fuel injected.

On the other hand, the injection drive circuit 132 controls the injection amount of the gas fuel under the influence of the detection signal detected through the detection unit 200. As a result, the injector 302 injects a different amount of gas fuel depending on the state of the engine 401 and the operating conditions.

In a state where the temperature of the coolant of 40 ° C. or more is sensed through the water temperature sensor 203, the engine 401 may be opened while the accelerator 402 is opened. At this time, the engine speed sensor 202 detects the rotation speed of the engine 401, the throttle position sensor 204 detects the opening degree of the accelerator 402. Therefore, the injection drive circuit 132 controls the injection amount of the gas fuel in accordance with the detection signal through the engine speed sensor 202 and the throttle position sensor 204. Therefore, the rotation speed of the engine 401 increases, and the injection amount of the gas fuel also increases as the opening degree of the accelerator 402 increases.

When the pressure of the gas fuel inflow passage 403 is increased through the pressure sensor 205 or when abnormal vibration of the engine 401 is detected through the knock sensor 208, the injection driving circuit 132 The injection amount of gaseous fuel to the engine 401 through the injector 302 is increased. On the other hand, when the opening degree of the accelerator 402 is rapidly decreased through the throttle position sensor 204 or when the engine speed reaches idling through the engine speed sensor 202, The injection drive circuit 132 blocks the gas fuel injection to the engine 401 through the injector 302.

The governor drive circuit 133 is connected to the governor actuator 303. The governor actuator 303 controls the diesel fuel supplied from the diesel tank 406. In addition, the governor driving circuit 133 controls the governor actuator 303 in a PWM manner to control the injection amount of diesel fuel. In addition, the governor drive circuit 133 may be operated in a state in which the shutoff valve 301 is closed to discharge gas fuel from the gas tank 405. Therefore, when the valve driving circuit 131 closes the shutoff valve 301, the governor driving circuit 133 can not only inject the diesel fuel through the governor actuator 303, but also the injection amount of the diesel fuel. To control.

On the other hand, the mixed fuel system 10 generally uses diesel fuel preferentially. As a result, the electronic control apparatus 100 allows the diesel fuel to be injected through the governor actuator 303. When the diesel fuel is injected through the governor actuator 303 and is consumed, the operation of the governor driving circuit 133 is stopped and the valve driving circuit 131 opens the shutoff valve 301. For this reason, the injection driving circuit 132 may operate the injector 302 to allow the injection of the gas fuel through the injector 302.

The display driving circuit 134 is connected to the display device 304. The display device 304 displays information about the gas fuel injected into the engine 401 by the injection driving circuit 132 and the governor driving circuit 133. Therefore, the display driving circuit 134 displays the fuel injection amount on the display device 304 or displays the type of fuel injected.

The communication signal processing circuit 135 is connected to the communication device 305 and transmits a signal to check the state of the electronic control device 100 or to control the electronic control device 100 through the communication device 305. To convert. In addition, the communication device 305 may be a computer or a terminal capable of PC communication or RS232 communication with the electronic control device 100. Thus, the communication device 305 may be provided with dedicated software for the electronic control device 100, the state of the electronic control device 100 can be confirmed, the setting for the operation of the electronic control device 100 This can be done.

In addition, the electronic control apparatus 100 further includes a changeover switch 110. The changeover switch 110 may be selected from one of a diesel fuel mode and a mixed fuel mode. Accordingly, the type of fuel injected into the engine 401 is selected. When the selector switch 110 is selected as the mixed fuel mode, the shutoff valve 301 is opened so that the injection driving circuit 132 injects the gas fuel through the injector 302 and controls the injection amount of the gas fuel. At this time, the display device 304 displays the injection amount of the gas fuel in addition to the fact that the gas fuel is injected into the engine 401 through the display driving circuit 134. On the other hand, when the changeover switch 301 is selected as the diesel fuel mode, the shutoff valve 301 is opened so that the governor drive circuit 133 injects the diesel fuel through the governor actuator 303 and the injection amount of the diesel fuel. To control. In this case, the display device 304 displays the injection amount of the diesel fuel in addition to the fact that the diesel fuel is injected into the engine 401 through the display driving circuit 134. This operation switch 110 is disposed to be easily operated. For example, the vehicle is arranged in the driver's seat.

The power supply unit 104 supplies a current to the input processing unit 101, the control unit 102, and the output processing unit 103, and serves as a power source for driving the electronic control apparatus 100 of the mixed fuel system.

While specific embodiments have been described above, it will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

1 is a block diagram illustrating an electronic control apparatus of a mixed fuel system according to a preferred embodiment of the present invention.

FIG. 2 is a block diagram illustrating a state in which an electronic controller of the mixed fuel system illustrated in FIG. 1 is connected to a sensing unit and a sensor unit.

FIG. 3 is a diagram illustrating a mixed fuel system including the electronic controller illustrated in FIG. 1.

Claims (12)

In a mixed fuel system for providing diesel fuel and gas fuel to the engine, An input processing unit connected to a sensing unit including a speed sensor, an engine speed sensor, a water temperature sensor, a throttle position sensor, a pressure sensor, an oxygen sensor, a temperature sensor, and a knock sensor, and converting and providing a sensing signal detected through the sensing unit. ; A controller configured to process and convert the sensed signal provided from the input processor to generate and provide a control signal; An output processor connected to a driving unit including a shutoff valve, an injector, a governor actuator, a display switch, and a communication device, and receiving the control signal from the control unit to control the driving unit; And A power supply unit for supplying a current to the input processing unit, the control unit and the output processing unit, And an amount of the gaseous fuel provided to the engine is automatically controlled according to the sensing signal sensed by the sensing unit. The method of claim 1, wherein the input processing unit, A speed detection circuit for converting the detection signal for the speed of the engine in the form of a square wave detected by the speed sensor into a voltage form; An engine speed detection circuit for converting the detection signal of the sinusoidal engine speed detected by the engine speed sensor into a voltage form; A water temperature detection circuit for setting the detection signal for the coolant temperature of the engine detected by the water temperature sensor to a resistance value; A throttle position detection circuit for setting the detection signal for the opened degree of the accelerator detected by the throttle position sensor to a resistance value; A pressure detection circuit for setting the detection signal for the inflow passage pressure of the gas fuel sensed by the pressure sensor to a resistance value; An oxygen detection circuit for amplifying and filtering the detection signal for the amount of oxygen in the exhaust port sensed by the oxygen sensor and comparing it with a reference oxygen amount in the exhaust port; A temperature detection circuit for setting the detection signal for the internal temperature of the vaporizer detected by the temperature sensor to a resistance value; And And a knock signal detection circuit configured to detect whether abnormal vibration of the engine is detected by amplifying and filtering the detection signal with respect to the pressure inside the engine sensed by the knock sensor. . The method of claim 2, wherein the output processing unit, A valve driving circuit connected to the shutoff valve and opening / closing the shutoff valve; An injection driving circuit connected to the injector and controlling the injector by the PWM method to control the injection amount of the gas fuel; A governor driving circuit connected to the governor actuator and controlling the injection amount of the diesel fuel by controlling the governor actuator in a PWM manner; A display driving circuit connected to the display device and configured to display an amount of fuel injected into the engine or display a type of fuel injected into the display device; And And a communication signal processing circuit connected to the communication device and converting a signal to confirm a state of the electronic control device or to control the electronic control device through the communication device. Electronic control unit. The method of claim 3, wherein And when the valve driving circuit opens the shutoff valve, the injection driving circuit is capable of injecting the gaseous fuel through the injector. The method of claim 3, wherein the electronic control device, Selecting one of the diesel fuel mode or mixed fuel mode, further comprising a switch for selecting the type of fuel injected into the engine, And the shutoff valve is opened when the changeover switch is selected as the mixed fuel mode. The method of claim 3, wherein In the state where the temperature of the coolant of 40 ° C or more is sensed by the water temperature sensor, the engine speed detected through the engine speed sensor and the degree of opening of the accelerator detected through the throttle position sensor, And an injection driving circuit controls the amount of the gas fuel injected through the injector. The method of claim 6, As the engine speed and the degree of opening of the accelerator increase, the injection driving circuit increases the amount of the gas fuel injected into the engine through the injector. . The method of claim 3, wherein As the inflow passage pressure of the gas fuel sensed by the pressure sensor is increased, the injection driving circuit increases the amount of the gas fuel injected into the engine through the injector, the electronics of the mixed fuel system, characterized in that Control unit. The method of claim 3, wherein And when the abnormal vibration of the engine is detected through the knock sensor, the injection driving circuit reduces the amount of the gas fuel injected into the engine through the injector. The method of claim 3, wherein When it is detected that the opening degree of the accelerator is drastically reduced through the throttle position sensor, the injection driving circuit cuts off the gas fuel injected into the engine through the injector. Electronic control unit. The method of claim 3, wherein When the engine speed corresponding to the idle speed of the engine is sensed by the engine speed sensor, the injection driving circuit cuts off the gas fuel injected into the engine through the injector of the mixed fuel system, characterized in that Electronic controller. The method of claim 3, wherein The communication device may be a computer or a terminal in which PC communication or RS232 communication is performed with the electronic control device, a dedicated software of the electronic control device may be installed, and the state of the electronic control device may be confirmed. Electronic control device for a mixed fuel system, characterized in that to set the operation of.

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