CN203308592U - Methyl alcohol and gasoline both-arranged common rail system of electronic injection automobile - Google Patents

Abstract

The utility model relates to the application technology of an electronic injection vehicle which uses pure methanol instead of gasoline, in particular to a dual methanol and gasoline common rail system for an electronic injection vehicle. It adopts the separation of methanol and gasoline, that is, installs a group of methanol fuel supply units on the original car, and connects the oil circuit of the original car at the front end of the oil rail through a mixing valve with automatic pressure relief capability. This application uses gasoline to start the hot car and then The method of converting to methanol application well solves the technical problems existing in the prior art.

Description

Methanol and gasoline double common rail system for EFI vehicles

technical field

The utility model relates to the application technology of an electronic injection vehicle which uses pure methanol instead of gasoline, in particular to a dual methanol and gasoline common rail system for an electronic injection vehicle.

Background technique

At present, more than 70 countries in the world have used methanol vehicles to varying degrees, and some have reached large-scale promotion, and the status of methanol vehicles is increasing day by day. Methanol is rich in resources, renewable, and belongs to biomass energy. Synthetic methanol can be extracted from solid (such as coal, coke), liquid (such as crude oil, heavy oil, light oil) wood dry distillation or gas (such as natural gas and other flammable gases. Using methanol in automobiles can increase the octane number of fuel and increase oxygen Content, so that the combustion in the cylinder of the car is more complete, and can reduce the emission of harmful substances in the exhaust gas.

At present, the application of methanol in automobiles in China is divided into the following two types: 1. Methanol gasoline, that is, gasoline is mixed with a certain proportion of methanol. Quantity regulation controller to enable the combustion of methanol in gasoline engines. This kind of application method has hidden troubles in the oil pump and oil pipe of the original car, and the high proportion of methanol also has the problem that the car cannot be used in winter; due to the strong solubility of methanol, the oil circuit, fuel tank, and gasoline filter element of the original car are easily dissolved, causing spraying. Grease nipple is clogged. 2. Purely burn methanol, that is, install a fuel injection quantity adjustment controller on the original vehicle, and use the original vehicle fuel tank to hold methanol. This type of application also has the problems of mode 1. And it also brings new problems, because the methanol combustion is not complete under the cold car state, before the engine temperature reaches 70 degrees, the methanol near the cylinder wall will not be able to fully burn due to the existence of the quenching effect, resulting in the cylinder liner and ring of the engine Wear increases during this period.

Utility model content

The purpose of the utility model is to provide a dual methanol and gasoline common rail system for electric spray vehicles, which solves the problem of high temperature air resistance in the prior art.

The purpose of this utility model is achieved through the following approaches: a methanol and gasoline double-installed common rail system for electric injection vehicles, the controller is externally connected to three components, and the first path is connected to the gasoline pump/methanol pump switching relay through the control wiring harness. The second route is connected to the switch/display unit through the control harness, and the third route is connected to the original vehicle fuel rail through the fuel injector harness; the original vehicle fuel rail is connected to the mixing valve, and the mixing valve is respectively connected to the methanol oil supply through the methanol oil circuit The unit is connected to the fuel tank of the original car through the gasoline oil circuit of the original car; the switch/display unit is connected to the methanol oil supply unit through the connection line of the methanol oil level sensor.

As a further optimization of this solution, the controller is an automotive-grade single-chip microcomputer.

The utility model methanol and gasoline dual-installed common rail system for EFI vehicles adopts the separation of methanol and gasoline, that is, a group of methanol fuel supply units are added to the original car, and a mixing valve with automatic pressure relief capability is connected to the front end of the fuel rail. The original car oil circuit, this application uses gasoline to start the hot car and then converts it to methanol application, which solves the technical problems existing in the prior art.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Fig. 1 is a block diagram of the utility model;

In the figure, controller 1, control wiring harness 2, fuel injector wiring harness 3, methanol oil level sensor connection line 4, gasoline pump/methanol pump switching relay 5, original vehicle gasoline oil circuit 6, mixing valve 7, original vehicle fuel rail 8 , methanol oil circuit 9, methanol fuel supply unit 10, switching/display unit 11, and original vehicle fuel tank 12.

Detailed ways

As shown in Figure 1, the methanol and gasoline dual common rail system for EFI vehicles of the present invention, its core component controller 1 adopts an automotive-grade single-chip microcomputer, and the controller 1 is externally connected to three components, the first through the control wiring harness 2 and Gasoline pump/methanol pump switching relay 5 is connected, the second path is connected to the switching/display unit 11 through the control harness 2, and the third path is connected to the original vehicle oil rail 8 through the fuel injector harness 3; the original vehicle oil rail 8 Connect the mixing valve 7, the mixing valve 7 is respectively connected to the methanol oil supply unit 10 through the methanol oil circuit 9, and connected to the original vehicle fuel tank 12 through the original vehicle gasoline oil circuit 6; the switching/display unit 11 is connected to the methanol oil level sensor connection line 4 Connect with the methanol oil supply unit 10.

The switch/display unit 11 is equipped with a three-speed switch, a status indicator light and a methanol oil level indicator light and a power indicator light. Under the control of the third gear switch of the switching/display unit 11, the controller 1 will detect the current target working state in real time, and control the switching process through the built-in control algorithm. The oxygen sensor above detects the signal of insufficient fuel, and controls the fuel injection pulse width of the original vehicle to increase. Controller 1 detects this suddenly increased signal, and judges that the switching process has started, and further increases the fuel injection volume until the control The pulse width of the original car detected by the device 1 returns to normal. During this process, the fuel injection volume decreases step by step until the methanol combustion in the original car fuel rail 8 is completed.

When the switch on the switching/display unit 11 is set to the gasoline state, the controller 1 does not output the oil pump power switching signal, the gasoline pump/methanol pump switching relay 5 does not operate, and the gasoline oil circuit 6 of the original car passes through the gasoline pump/methanol pump switching relay The normally closed contact of 5 is connected, and the gasoline pump of the original car is working. At the same time, the controller 1 solves whether to start the switching process control strategy by judging whether it is working in the methanol state before this switching. When it was working in the methanol state, the controller 1 1 will enable the switching process control strategy, reduce the fuel injection pulse width step by step, and detect the engine vibration in real time, and correct the fuel injection quantity. After the switching process is completed, the controller 1 will stop working, and the isolation diode of the controller 1 will Directly connected to the original vehicle fuel injection line.

When the switch on the switch/display unit 11 is in the state of methanol, the controller 1 outputs the oil pump switching signal, the gasoline pump/methanol pump switching relay 5 acts, and the methanol pump is connected to the power supply of the gasoline pump of the original car through the normally open contact of the relay 5 At the same time, the gasoline pump/methanol pump switching relay 5 disconnects the gasoline pump power supply connected to the normally closed contact, thus realizing the switching between the methanol pump and the gasoline pump. At the same time, the controller 1 judges whether it was working under the gasoline state before this switching. If it was working under the gasoline state, the controller 1 starts the switching process control strategy, increases the fuel injection quantity step by step, and detects the engine vibration in real time, and repairs the injection molding. oil volume. Until the switching process is completed, it will enter the full methanol working mode.

When the switching/display unit 11 is placed in the automatic state, the engine will work under gasoline when the engine temperature is low, and automatically turn to the methanol state to work after the engine temperature rises. The controller 1 detects the position of the ignition switch in real time. After the switch was turned off, the controller 1 automatically turned the engine into the gasoline state to work for 1 minute, allowing part of the gasoline to enter the original car oil rail 8, so as to prepare for the next cold start.

The methanol oil circuit 9 is connected to the original car oil circuit through the mixing valve 7. When the switching process occurs, the gasoline pump/methanol pump switching relay 5 is connected to the original car gasoline pump or methanol pump in connection with the relevant control signal and the gasoline pump is switched on. Or methanol is isolated from each other by mixing valve 7. Due to the existence of the mixing valve 7, when the engine is hot and the car is stopped, the methanol or gasoline in the original car oil rail 8 is heated up by the residual heat of the engine, and the pressure increases. When the pressure increases to the pressure relief pressure set by the mixing valve, the mixing The pressure relief valve inside the valve is opened to avoid a further increase in pressure, thereby solving the problem of thermal gas resistance and ensuring the stability and reliability of the system.

Claims (1)

1. an electro jet car methyl alcohol, gasoline pair are put common rail systems, it is characterized in that: each parts of external three roads of controller (1), the first via is connected with petrol pump/methanol pump transfer relay (5) by controlling wire harness (2), the second tunnel is connected with switching/display unit (11) by controlling wire harness (2), and Third Road is connected with former car oil rail (8) by oil nozzle wire harness (3);

Described former car oil rail (8) connects mixing valve (7), and mixing valve (7) connects methyl alcohol oil supply unit (10), connects former car fuel tank (12) through former car gasoline passage (6) through methyl alcohol oil circuit (9) respectively;

Described switching/display unit (11) is connected with methyl alcohol oil supply unit (10) by methyl alcohol fuel level sensor connecting line (4).

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