CN201103473Y - Gas electric spraying system of two-stroke outboard machine - Google Patents

Abstract

The utility model relates to a gas electronic fuel injection system of a two-stroke outboard engine, which comprises a gas cylinder, an on-off valve, an LPG/CNG gas preheating pressure regulator, a gas common-rail nozzle, an electronic control unit, an air throttle angle sensor, a water temperature sensor, a synchronizing datum signal sensor, a high energy ignition system, an oxygen sensor and a three-way catalyst; the on-off valve and the LPG/CNG gas preheating pressure regulator are arranged on an outlet of the gas cylinder; the air throttle angle sensor is arranged on an inlet of a motor; the oxygen sensor and the three-way catalyst are arranged on the air throttle body of the motor; the high energy ignition system is arranged on the top of the motor; the synchronizing datum signal sensor is arranged on the corresponding position of a crankshaft on the gas cylinder; the electronic control unit receives working condition signals from each sensor and outputs control signals after being processed to control the operation of the two-stroke outboard engine. The system can promote the output power of the two-stroke outboard engine, lower the energy consumption and reduce the pollution of tail gas of the motor to environment to the lowest.

Description

Two-stroke outboard motor gas electric injection system

technical field

The utility model relates to the technical field of two-stroke gas-fired electric injection engines, in particular to a kind of control for two-stroke gas-fired outboard motors, so as to ensure the precise ignition advance angle and fuel injection quantity of the engine in each working condition, so that the two-stroke gas-fired The two-stroke outboard motor gas electric injection system has high output power, reduced fuel consumption, and minimizes the pollution of the engine exhaust to the environment.

Background technique

The engine is a device that provides power, and its function is to burn the fuel supplied to it to generate power. The engine is divided into gasoline engine, diesel engine and gas engine according to the fuel used. According to the number of strokes to realize the cycle, it is generally divided into two categories: four-stroke engines and two-stroke engines.

For every revolution of the crankshaft of a two-stroke engine, there is one power stroke. Therefore, under the same conditions of factors such as rotational speed and intake conditions, the power that a two-stroke engine can produce should be equal to 1.5 to 1.7 times that of a four-stroke engine with the same working volume.

Two-stroke outboard gasoline engines, which are widely used in small surface boats, account for 90% of all small boat engines.

However, the combustion exhaust gas of the outboard gasoline engine used in small boats must enter the water to silence and cool down. Due to the short-circuit loss of the scavenging process of the two-stroke gasoline engine, a large amount of unburned gasoline engine oil mixture and fuel additives will be discharged into the water, causing damage to the water quality. At the same time, because the two-stroke outboard gasoline engine adopts the traditional carburetor oil supply method, and the effective working phase is smaller than that of the four-stroke gasoline engine, there are problems in the formation and combustion of the engine mixture, and it is easy to produce a large amount of HC, CO, NOX and sulfide are discharged into the water, causing further pollution to the water area and its surrounding environment.

For surface ships in tourist areas, if a two-stroke gasoline outboard engine is used, the discharge of the exhaust gas will directly contact the water, and the discharge on the water surface and in the water will be more difficult to clean. Therefore, gas outboard motors using cleaner fuels are more suitable for ships in tourist areas. Gas outboard motors use liquefied petroleum gas or compressed natural gas as fuel, which can minimize exhaust pollution. At the same time, the electronic injection system is used to accurately control the ignition timing and injection volume of each working condition to further reduce exhaust pollution, improve engine power and reduce fuel consumption. Most of the existing gas outboard motors are four-stroke gas outboard motors, but four-stroke gas outboard motors have complex structures, high failure rates, difficult maintenance and low output power, high equipment replacement and use costs, and poor cost performance .

Contents of the invention

The technical problem to be solved by the utility model is to provide a two-stroke outboard motor gas electric injection system for accurately controlling the ignition advance angle and fuel injection quantity of the engine under various working conditions.

The technical scheme that the utility model takes for solving the technical problem existing in the known technology is:

The fuel injection system for two-stroke outboard motors of the present utility model includes: gas cylinders, switch solenoid valves, LPG/CNG gas preheating regulators, gas common rail nozzles, electric control units, throttle angle sensors, water temperature sensors, Synchronous reference signal sensor, high-energy ignition system, oxygen sensor and three-way catalytic converter; switch solenoid valve and LPG/CNG gas preheating pressure regulator are installed at the outlet of the gas cylinder, and the gas fuel after pressure regulation is injected from the gas common rail nozzle Into the engine intake port, the throttle body of the engine is provided with a throttle angle sensor, the exhaust port of the engine is provided with an oxygen sensor and a three-way catalytic converter, the top of the engine is provided with a high-energy ignition system including a spark plug, and the corresponding position of the crankshaft on the cylinder is provided The synchronous reference signal sensor, the electronic control unit receives the working condition signal from each sensor, and outputs the control signal after processing to control the work of the gas common rail nozzle and spark plug.

The utility model can also adopt the following technical measures:

The water temperature sensor is installed on the LPG/CNG gas preheating pressure regulator, which is at the cooling water circulation of the engine.

The LPG/CNG gas preheating pressure regulator can stabilize the pressure of the gas fuel at a medium pressure of 3-5 bar, thereby compensating for the reduction of gas intake caused by the shortening of the intake phase by increasing the injection pressure.

The gas electric injection system of the two-stroke outboard engine performs closed-loop correction according to the gas injection pressure.

The fuel injection direction of the gas common rail nozzle is consistent with the sweeping air flow direction of the scavenging channel.

In the high-energy ignition system, the ignition energy is increased by increasing the turns ratio of the ignition coil.

In the described electronic control unit, the synchronous reference signal input by the trigger coil of the engine magneto is processed into a square wave signal by the photoelectric isolation circuit and the Schmidt filter circuit and enters the single-chip microcomputer; the throttle angle signal input by the throttle angle sensor The water temperature signal input by the water temperature sensor enters the microcontroller through the processing of the low-pass filter circuit; the oxygen concentration signal input by the oxygen sensor enters the microcontroller through signal amplification and voltage conversion circuit processing; the microcontroller The digital output port of the single-chip computer outputs the fuel injection pulse width signal, and the output process is completed by the fuel injection control circuit composed of the signal amplification and voltage conversion circuit and the power drive unit; the digital port of the single-chip microcomputer outputs the variable ignition advance angle signal, and the output process is through The ignition control circuit is composed of signal amplification circuit, photoelectric isolation circuit, power drive unit, and release circuit; the digital output terminal of the single-chip microcomputer outputs the driving signal of the electromagnetic switch valve, and the output process is completed through the signal amplification and voltage conversion circuit and the power drive circuit.

The installation bracket of the throttle angle sensor includes two parts: the butterfly valve extension shaft and the bracket. The butterfly valve extension shaft is connected to the end of the butterfly valve core shaft without linkage mechanism by a positioning pin. The fixing bolts fix the bracket and the original carburetor body together, and the throttle angle sensor is fixed on the bracket. When the throttle butterfly valve rotates, the extension shaft will drive the shaft in the sensor to rotate together.

The advantages and positive effects that the utility model has are:

In the gas electric injection system for two-stroke outboard motors of the present utility model, the working condition information of the outboard motor is transmitted to the electric control unit through each sensor, and the electric control unit directly controls the working state of the outboard motor according to these working condition information, ensuring The power output of the outboard motor adjusts the injection pulse width and ignition timing of the gas fuel to ensure that the pollution of the engine exhaust to the environment is minimized.

Description of drawings

Fig. 1 is a schematic structural view of a two-stroke gas electric injection outboard engine of the present invention;

Fig. 2 is a block diagram of the control principle of the electric control unit of the two-stroke gas-fired electric injection outboard motor of the present invention;

Fig. 3 is the structural representation of the butterfly valve extension shaft and the support of the mounting bracket of the throttle angle sensor in the utility model;

Explanation of symbols of main components in the accompanying drawings:

1: Cylinder 2: Cylinder

3: Switch solenoid valve 4: LPG/CNG gas preheating regulator

5: Water temperature sensor 6: Gas common rail nozzle

7: Spark plug and high-energy ignition system 8: Synchronous reference signal sensor

9: Throttle angle sensor 10: Oxygen sensor

11: Three-way catalytic converter 12: Electronic control unit

13: Gas pressure sensor 14: Butterfly valve extension shaft

15: Bracket 16: Locating pin

17: Butterfly valve core shaft 18: Fixing bolt

Detailed ways

The utility model is described in detail below with reference to the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of a two-stroke gas-fired electric injection outboard engine of the present invention; Fig. 2 is a block diagram of the control principle of the electric control unit of the utility model two-stroke gas-fired electric injection outboard engine; Fig. 3 is a middle section of the utility model Schematic diagram of the butterfly valve extension shaft and bracket of the installation bracket of the valve angle sensor.

As shown in Figure 1, the two-stroke gas electric injection outboard engine includes: cylinder 1, spark plug and high-energy ignition system 7, gas cylinder 2, electronic control unit 12, throttle angle sensor 9, water temperature sensor 5, and synchronization reference signal sensor 8. Oxygen sensor 10, three-way catalytic converter 11, gas common rail nozzle 6, gas pressure sensor 13, gas cylinder 2 is connected to cylinder 1, and LPG/CNG gas preheating and pressure regulation are set on the passage between gas cylinder 2 and cylinder 1 device 4 and switch solenoid valve 3, and the water temperature sensor 5 is set on the LPG/CNG gas preheating regulator 4, the LPG/CNG gas preheating regulator can stabilize the pressure of the gas fuel at 3 to 5 bar, and the gas fuel The common rail nozzle 6 is sprayed into the intake port of the engine, the throttle body of the cylinder is provided with a throttle angle sensor 9, the exhaust port of the cylinder is provided with an oxygen sensor 10 and a three-way catalytic converter 11, and the top of the cylinder is provided with a spark plug 7 In the high-energy ignition system, a crankshaft position sensor 8 is installed at the corresponding position of the crankshaft on the cylinder, and the electronic control unit 12 receives the working condition signals from each sensor. After processing, the electronic control unit controls the operation of the gas common rail nozzle 6 and the spark plug 7. The fuel injection direction of the gas common rail nozzle 6 is consistent with the sweeping airflow direction along the scavenging channel. The system performs closed-loop correction control based on the gas pressure sensor 13 .

As shown in Figure 2, in the electronic control unit, the synchronous reference signal from the trigger coil of the engine magneto is processed into a square wave signal through the photoelectric isolation circuit and Schmidt filter circuit and enters the microcontroller; the throttle angle sensor is installed on the throttle, Its function is to convert the opening signal of the engine throttle into an electrical signal and transmit it to the electronic control unit to sense the load of the engine and the acceleration and deceleration conditions. The throttle angle signal input by the throttle angle sensor is passed through the low-pass The processing of the filter circuit enters the single-chip microcomputer; the water temperature signal input by the water temperature sensor enters the single-chip microcomputer through the processing of the low-pass filter circuit; the oxygen sensor is used to detect the oxygen content in the exhaust gas of the automobile, and the air-fuel ratio is determined according to the oxygen concentration in the exhaust gas. The control unit sends a feedback signal to control the air-fuel ratio to converge to the theoretical value. The oxygen concentration signal from the oxygen sensor enters the single-chip microcomputer through signal amplification and voltage conversion circuit processing; the output fuel injection pulse width signal comes from the digital output port of the single-chip microcomputer. The output process The fuel injection control circuit composed of signal amplification and voltage conversion circuit and power drive unit is completed; the output variable ignition advance angle signal comes from the digital port of the single chip microcomputer, and the output process is composed of signal amplification circuit, photoelectric isolation circuit, power drive unit, release The ignition control circuit composed of circuits and other components is completed; the output electromagnetic switch valve drive signal comes from the digital output terminal of the single-chip microcomputer, and the output is completed through the signal amplification and voltage conversion circuit and the power drive circuit; the communication signal is output through the CAN bus transceiver circuit. In the high-energy ignition system, the ignition energy can be increased by increasing the turns ratio of the ignition coil.

As shown in Figure 3, the mounting bracket of the throttle angle sensor includes two parts: the butterfly valve extension shaft 14 and the bracket 15. The fixing bolt 18 at one end of the throttle shaft extension shaft fixes the bracket and the original carburetor body together, and the throttle angle sensor 10 is fixed on the bracket 15. When the throttle butterfly valve rotates, the extension shaft will drive the shaft in the sensor to rotate together .

Claims (8)

1, a kind of gas electrojet system of two-stroke outboard engine is characterized in that: comprising: gas cylinder, switch electromagnetic valve, LPG/CNG gas-preheating pressure governor, combustion gas be rail nozzle, ECU (Electrical Control Unit), throttle angle sensor, cooling-water temperature sensor, synchronizing datum signal sensor, high-energy ignition system, lambda sensor and ternary catalyzing unit altogether; The gas cylinder outlet port is provided with switch electromagnetic valve and LPG/CNG gas-preheating pressure governor, gaseous fuel after pressure regulation is total to the rail nozzle by combustion gas and is injected in the engine inlets, engine inlets are provided with throttle angle sensor, the throttle body of motor is provided with lambda sensor and ternary catalyzing unit, the motor top is provided with the high-energy ignition system that comprises spark plug, the relevant position of bent axle is provided with the synchronizing datum signal sensor on cylinder, ECU (Electrical Control Unit) receives the working condition signal from each sensor, exports the work that control signal control combustion gas is total to rail nozzle and spark plug after treatment.

2, gas electrojet system of two-stroke outboard engine according to claim 1 is characterized in that: cooling-water temperature sensor is installed on the LPG/CNG gas-preheating pressure governor, and this position is in engine cooling water cycle place.

3, gas electrojet system of two-stroke outboard engine according to claim 1, it is characterized in that: LPG/CNG gas-preheating pressure governor can be with the pressure stability of gaseous fuel at medium pressure 3～5bar, thereby compensates the minimizing that air inlet phase shortens the combustion gas intake that causes by the raising of jet pressure.

4, gas electrojet system of two-stroke outboard engine according to claim 1 is characterized in that: gas electrojet system of two-stroke outboard engine carries out the closed loop correction according to fuel gas injection pressure.

5, gas electrojet system of two-stroke outboard engine according to claim 1 is characterized in that: the direction that combustion gas is total to rail nozzle ejection fuel is consistent along the scavenging flow path direction with scavenging air belt.

6, gas electrojet system of two-stroke outboard engine according to claim 1 is characterized in that: all mistakes of high-energy ignition system strengthen the turn ratio of spark coil to improve ignition energy.

7, gas electrojet system of two-stroke outboard engine according to claim 1, it is characterized in that: in the ECU (Electrical Control Unit), synchronizing datum signal by the trigger winding of motor magnetogenerator is imported is processed into square signal by photoelectric isolating circuit and Schmidt's eliminator and enters single-chip microcomputer; By the throttle valve angle signal of throttle angle sensor input, the processing by low-pass filter circuit enters single-chip microcomputer; By the water temperature signal of cooling-water temperature sensor input, the processing by low-pass filter circuit enters single-chip microcomputer; By the oxygen concentration signal of lambda sensor input, enter single-chip microcomputer by signal amplification and voltage conversion circuit processing; The digital quantity output port output fuel injection pulsewidth signal of single-chip microcomputer, the fuel injection control circuit that output procedure is made up of signal amplification and voltage conversion circuit, power drive unit is finished; The digital quantity port of single-chip microcomputer is exported variable ignition advance angle signal, and output procedure is to finish by composition ignition control circuits such as signal amplification circuit, photoelectric isolating circuit, power drive unit, release circuit; The digital quantity output terminal of single-chip microcomputer output magnetic switch valve drive signal, output procedure is finished by signal amplification and voltage conversion circuit and power driving circuit.

8, gas electrojet system of two-stroke outboard engine according to claim 1, it is characterized in that: the mounting bracket of throttle angle sensor comprises that butterfly valve prolongs axle and support two-part, butterfly valve prolongs axle and is attached at an end that does not have linking mechanism on the butterfly valve mandrel by a locating stud, the fixing bolt that utilizes former carburetor throttle axle to prolong axle one end is fixed together support and former Carburetor body, throttle angle sensor is fixed on the support, when throttle butterfly rotated, prolonging axle can rotate by the interior axle of drive sensor together.

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