CN201396216Y - A control system for a methanol flexible fuel vehicle - Google Patents

Abstract

The utility model relates to a control system for a blended fuel engine, in particular to a control system for a methanol flexible-fuel vehicle (FFV). The control system comprises a blended fuel supply system, an electric control system and an engine. The blended fuels in a blended fuel tank contain methanol with a percentage composition x ranging from 0 to 100, and the rests are assisting fuels.The utility model has the advantages that the fuel percentage in the blended fuel tank can be random proportion, that is, assisting fuels and methanol, or the mixture of blended fuel and methanol canbe randomly added, and no additive is needed, so that the control system has flexible fuel proportioning, good start performance, high dynamic property and clean emission; and the technical problems of uncontrollable fuel supply, reduced vehicle start performance, bad dynamic property, and emission pollution caused by methanol-gasoline layering are solved.

Description

A control system for a methanol flexible fuel vehicle

technical field

The utility model relates to a control system of a mixed fuel engine, in particular to a control system of a methanol flexible fuel vehicle.

Background technique

With the development of industrial technology, automobiles have become an important means of transportation for people. At present, the main fuel for automobiles is gasoline, which is a non-renewable fuel and causes pollution to the environment. New types of fuels are expected, and now the fuels used in automobile engines are beginning to diversify. Methanol has a wide range of raw materials, and the transportation, storage, filling and use of products are similar to gasoline and diesel fuel for internal combustion engines currently available on the market; methanol has a high octane number, complete oxygen-containing combustion, and a higher ignition temperature than gasoline , the combustion process is safe, and it is an ideal alternative fuel for vehicles.

However, methanol also has certain problems when used as a vehicle fuel:

(1) Stratification of methanol-gasoline blended fuel

Methanol contains hydroxyl groups and has strong polarity. It is infinitely miscible with water but hardly soluble in hydrocarbon fuels. In a certain mixing ratio and within a certain temperature range, methanol-gasoline blended fuel has a stratification phenomenon. Under the same ratio, the miscibility of methanol and gasoline changes with the increase of temperature, and vice versa. When the methanol content is small, the miscibility between methanol and gasoline decreases and the stratification area expands with the increase of methanol content. When the methanol content reaches a certain ratio, the miscibility is the worst. Continue to increase the methanol content, the miscibility rises, and the delamination area decreases.

Moisture can also easily cause system stratification. When storing and using alcohol-blended gasoline, it will automatically absorb moisture from the air. When the moisture content reaches a certain level, oil-water stratification will occur. Due to the uneven mixing, the fuel supply is actually out of control, the engine performance is reduced, and the operation is unstable. Therefore, miscibility and stability are problems that must be solved for methanol fuel for vehicles.

The existing method to solve the stratification of methanol-gasoline blended fuel is to add co-solvent. In view of the particularity of methanol fuel, there are several difficulties in this method at present:

1) The research on co-solvent is very difficult. One co-solvent is only suitable for one mixing ratio of methanol-gasoline blended fuel; if the mixing ratio changes, the amount and composition of co-solvent need to be adjusted accordingly.

2) The addition of co-solvent increases the cost of methanol fuel for vehicles, and the economical substitution advantage of methanol fuel is not obvious. Finally, the use of co-solvents has a certain impact on the friction, wear, corrosion, and emissions of the engine.

(2) Difficulty in cold start and low temperature start

When the engine starts cold (especially in winter), the speed is low, the air velocity is slow, and the outside air temperature is low, so it is difficult for the fuel to evaporate. The latent heat of vaporization of methanol is more than three times that of gasoline, so when methanol gasoline evaporates, it absorbs more heat, which will cause the temperature at the engine intake manifold to drop sharply, further deteriorating the intake evaporation conditions. In addition, the saturated vapor pressure of methanol is about 1/2 lower than that of gasoline, so only a small amount of alcohol can evaporate during cold start. If the concentration of the flammable mixture formed by evaporation does not reach the lower limit of the ignition concentration, the mixture cannot be ignited and burned , Difficulty starting the engine. Therefore, cars using methanol gasoline are more difficult to start cold and warm up longer than cars using ordinary gasoline.

(3) Emission issues

Methanol has a high latent heat of vaporization (1110kJ/kg, about 3.5 times that of gasoline) and a high flash point (11°C). Cars use methanol fuel to start directly. During the warm-up process, the incomplete combustion of methanol will produce a large amount of combustion intermediate products-unburned methanol and formaldehyde; at the same time, during this process, the after-treatment system-the three-way catalytic converter has not yet reached the optimum catalytic conversion temperature. Therefore, the direct start-up of automobiles using methanol has a lot of emissions, especially unconventional emissions, bad emissions, and serious environmental pollution.

At present, the control and solution of methanol vehicle emissions are focused on the exhaust system. That is, research on specialized catalysts for catalytic conversion.

Some patent applications have also done research in this area, such as the Chinese patent: "Methanol/Gasoline Flexible Injection Control System and New Methanol Fuel Vehicles (ZL200720077854.5)". Control the two fuels of methanol and gasoline to inject methanol fuel or gasoline fuel into the engine combustion chamber or inject quantitative methanol fuel and gasoline fuel at the same time. Although the system realizes the flexible ratio of methanol and gasoline for driving, it uses two systems of methanol and gasoline, and does not fully realize the problem of arbitrary addition of methanol and gasoline in the same fuel tank and driving with any ratio. .

Contents of the invention

The utility model mainly provides a mixed fuel that can add methanol or gasoline or methanol gasoline in any proportion to the mixed fuel tank, and does not need to use any additives. The fuel ratio is flexible, the starting performance is good, the power is high, and the emission is clean. The control system of the methanol flexible fuel vehicle; solves the technical problems of out-of-control fuel supply caused by the stratification of methanol-gasoline mixed fuel in the prior art, decreased vehicle starting performance, poor power performance, and emission pollution.

The above-mentioned technical problems of the utility model are mainly solved by the following technical scheme: a control system of a methanol flexible fuel vehicle, including a mixed fuel supply system, an electronic control system and an engine, and the described mixed fuel supply system includes a mixed fuel tank, the mixed fuel tank is connected with a mixed fuel pump, characterized in that:

The mixed fuel in the mixed fuel tank contains methanol, the percentage content x of methanol is 0<x<100, and the rest is auxiliary fuel;

An auxiliary fuel supply system is provided on one side of the mixed fuel supply system, and the auxiliary gasoline supply system includes an auxiliary fuel tank and an auxiliary fuel pump connected with the auxiliary fuel tank;

The electronic control system includes a flexible fuel electronic controller, one end of the flexible fuel electronic controller is connected with a sensor unit, and the other end is connected with a drive unit.

The fuel ratio in the mixed fuel tank can be any ratio, you can add auxiliary fuel and methanol at will, or a mixture of mixed fuel and methanol, such as a mixture of gasoline, methanol or methanol gasoline, without adding additives, and you don’t have to worry about two fuels The mutual solubility and stability issues of the sensor unit can transmit information to the flexible fuel electronic controller, and the flexible fuel electronic controller can adjust the corresponding combustion parameters according to the methanol content in the fuel. Multiple groups of working modules are stored in the flexible fuel electronic controller, and different modules can be called according to different methanol contents in the fuel, and different control parameters are stored in different modules.

Different ratios of auxiliary fuel and methanol require different additives, and the addition of these additives may cause incomplete combustion of the fuel in the engine, resulting in a large amount of carbon deposits, and even serious engine failure. The gasoline and methanol in the utility model can be added in any proportion without additives, which avoids the high cost of fuel caused by the research and development of additives; at the same time, because the flexible fuel electronic controller has corresponding control modules for different fuel components, it can Precisely control the engine work, so that the fuel in the engine can be fully burned, give full play to the high-efficiency combustion characteristics of methanol, improve the reliability of the engine, and achieve the effect of clean emissions.

There is an auxiliary fuel supply system on one side of the mixed fuel system. The auxiliary fuel supply system can be used as a starting system at low temperature. At the same time, if the mixed fuel supply system fails unexpectedly, the auxiliary gasoline fuel supply system can ensure the normal operation of the vehicle and improve It improves the stability, convenience and safety of the vehicle. Both the gasoline pump and the mixed fuel pump are built-in pumps, and of course they can also be external pumps.

The starting mode is that after the ignition switch is powered on, the fuel identification sensor identifies the methanol fuel content in the fuel. If the methanol fuel content is ≤ 10%, it will start with the mixed fuel system; if the methanol fuel content exceeds 10%, it will start with the auxiliary fuel system. ; The working mode is to identify the methanol content in the fuel through the fuel identification sensor after the start-up is completed, and transmit the corresponding data to the data processing unit, which analyzes the data and sends the result to the central control unit, the central Select the corresponding working module in the control unit and adjust the corresponding control parameters to make the engine work in the best state. And in the working process, the central control unit will call different working modules in time according to the change of methanol content. Since the latent heat of evaporation of methanol is more than three times that of gasoline, methanol absorbs a large amount of heat when it evaporates, and it is difficult for methanol fuel to evaporate; in addition, the vapor pressure of methanol (38°C) is only 1/5-1/6 of gasoline, making it Intake evaporation conditions further deteriorated. Therefore, when the engine is started directly with methanol at a temperature below 10°C, only a small amount of methanol evaporates. If the concentration of the flammable mixture formed by evaporation does not reach the lower limit of the ignition concentration, the mixture cannot be ignited and burned, causing the vehicle to start. Difficult problem, and low temperature emissions are also poor. Use the fuel identification sensor to monitor the methanol content in the oil circuit system. When the methanol content is low, use the auxiliary fuel system to start directly, that is, use the gasoline or diesel system to start. After starting, select according to the fuel component information sent back by the fuel identification sensor. Different working modules, multiple working modules are stored in the central control unit, each working module is set according to the content of methanol in the fuel, and each working module controls the driver to adjust the control parameters: such as ignition advance angle, ignition timing , fuel injection amount, injection time, etc., to ensure that the engine works reliably, the fuel is completely burned, and the engine has the highest power output, ensuring the fuel economy and emission indicators of methanol flexible fuel vehicles.

Preferably, the electronic controller includes a data input processing unit, a central control unit, and an output stage drive unit; the sensor unit is connected to the data input processing unit, and the fuel identification sensor in the sensor unit monitors the methanol content in the mixed fuel tank, through The data input processing unit analyzes the input data; the data input processing unit is connected to the central control unit, the central control unit is connected to the output stage drive unit, and the output stage drive unit is connected to the execution unit. According to the data transmitted by the fuel identification sensor, the central control unit flexibly adjusts the control parameters and invokes the corresponding control module. The ratio of methanol and gasoline in the mixed fuel tank is arbitrary and unknown, and the central control unit sets the control parameters according to the data, so that the combustion is more complete and the emission is cleaner. The power and reliability of methanol flexible fuel vehicles are extremely high.

As more preferably, the central control unit contains 11 groups of working modules, one of which is an auxiliary fuel system working module, and the other ten modules are mixed fuel working modules divided according to methanol content, which are the percentage of methanol The working module when the content is at (0, 10], the working module when the percentage content of methanol is at (10, 20], the working module when the percentage content of methanol is at (20, 30], the percentage content of methanol is at (30,40] when the working module, the percentage composition of methyl alcohol is in the working module when (40,50], the working module when the percentage composition of methyl alcohol is in (50,60], the percentage composition of methyl alcohol is in (60 , 70] when the working module, the working module when the percentage of methanol is in (70,80], the working module when the percentage of methanol is in (80,90] and the percentage of methanol is in (90,100 ) during the working module. According to the content of methanol, the modules are divided into 10, with 10% as a module division, the control is more precise, so that the combustion efficiency of the fuel is greatly improved. The performance can be optimally brought into play. Of course, the number of working modules can be further increased according to the control requirements, which will make the engine control more precise.

Preferably, the sensor unit includes a fuel identification sensor integrated with the mixed fuel rail, a mixed fuel system pressure sensor located on the mixed fuel system oil circuit, a mixed fuel oil level sensor located in the mixed fuel tank; located in the auxiliary fuel tank Auxiliary fuel quantity sensor, auxiliary fuel system pressure sensor located on the auxiliary fuel system pipe, speed sensor, coolant temperature sensor and knock sensor located on the engine, throttle position sensor located on the throttle shaft, located on the intake air Intake pressure sensor for the duct. As more preferably, the auxiliary fuel can be gasoline or diesel.

The fuel identification sensor can also be installed in the oil circuit of the mixed fuel system. In the present invention, the fuel identification sensor is installed on the mixed fuel oil rail where the mixed fuel will be delivered to the engine, and is integrated with the mixed fuel oil rail to provide a more realistic response The methanol content of the mixed fuel entering the engine improves the accuracy of control. Monitor the mixed fuel system and auxiliary fuel system through the values transmitted by the mixed fuel system pressure sensor and the auxiliary fuel system pressure sensor. When the pressure value of the supply system deviates from the normal value of 0.35Mpa by 15%, it means that the current working fuel supply There is a problem with the system and a failure mode needs to be invoked, i.e. another fuel system starts working. The fuel quantity sensor monitors the remaining fuel quantity in the fuel tank in real time, so as to determine whether to refill the fuel, which is convenient for drivers and passengers to drive and travel.

Therefore, the control system of a kind of methanol flexible fuel automobile of the present utility model has the following advantages: 1, does not need to use the additive that two kinds of fuels of methanol and auxiliary fuel (as gasoline or diesel oil) mix. Methanol or auxiliary fuel (such as gasoline or diesel) or a mixture of the two can be added to the mixed fuel tank at will, without using any additives, which saves research and development costs such as the preparation of mixed fuels, reduces vehicle research and development costs and vehicle use costs, and is economical Good sex. 2. Maximum flexibility. Realize the mixed use of methanol and auxiliary fuel (such as gasoline or diesel) in any ratio from 0 to 100, to achieve the greatest flexibility. 3. Good low-temperature start-up performance, clean emission during low-temperature start-up. This utility model is equipped with an auxiliary fuel starting working system. When the vehicle is started, if the fuel identification sensor detects that the methanol content in the mixed fuel is greater than 10%, the system will directly transfer to the auxiliary fuel starting working mode, which perfectly solves the problem of low temperature starting difficulties and The technical problem of poor emission during low temperature start-up. 4. Good power and clean emission. This utility model combines the self-adaptability of the electronic control system, and is aimed at the single auxiliary fuel (such as gasoline or diesel), the mixed fuel with about 5% methanol content, the mixed fuel with about 15% methanol content, the mixed fuel with about 25% methanol content, Mixed fuel with methanol content of about 35%, mixed fuel with methanol content of about 45%, mixed fuel with methanol content of about 55%, mixed fuel with methanol content of about 65%, mixed fuel with methanol content of about 75%, and methanol content of about 85% The blended fuel and the blended fuel with a methanol content of about 95%, a total of 11 types of fuel, the calibration and debugging of the engine are carried out separately to ensure that the engine has the best power output and the best economic performance when using any kind of fuel. and the cleanest emissions. And the fuel pumped into the engine burns completely, and the economical advantage is remarkable. 5. The working mode and failure mode of the auxiliary fuel system are set to improve the stability of the vehicle. The control parameters can be adjusted according to the vehicle conditions to ensure that the engine works reliably, and the fuel is converted and output with the highest efficiency, ensuring economy and emission indicators .

Description of drawings:

Fig. 1 is a schematic diagram of a control system of a methanol flexible fuel vehicle of the present invention.

Fig. 2 is a flowchart of a control method for a methanol flexible fuel vehicle of the present invention.

FIG. 3 is a schematic diagram of the electronic control system in FIG. 1 .

FIG. 4 is a flow chart of the auxiliary fuel system in FIG. 2 .

FIG. 5 is a flow chart of the failure mode system in FIG. 2 .

Detailed ways:

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example:

As shown in Figure 1, a methanol flexible fuel vehicle control system includes a mixed fuel supply system, an auxiliary fuel supply system, an electronic control system and an engine, wherein the auxiliary fuel supply system is an auxiliary gasoline fuel supply system. The mixed fuel supply system includes a mixed fuel tank 1, in which gasoline, methanol or a mixture of the two fuels can be added at will, without adding any additives. The mixed fuel tank 1 is connected with a mixed fuel pump 2, a mixed fuel oil level sensor 3 is installed in the mixed fuel tank 1, a mixed fuel pump relay 4 is connected with the mixed fuel pump 2, and an oil circuit 5 is connected with the mixed fuel pump 2 , a mixed fuel filter 6 and a mixed fuel system pressure sensor 7 are installed on the oil passage 5 . A gasoline tank 8 less than 15L is installed on one side of the mixed fuel tank 1. A gasoline pump 9 and a gasoline oil quantity sensor 10 are arranged in the gasoline tank 8. The gasoline pump 9 is connected with a gasoline pump relay 11 and an oil delivery pipeline 12. The oil delivery pipeline 12 Fuel filter 13 and gasoline system pressure sensor 14 are installed on it. A gasoline fuel injection device and a mixed fuel injection device are respectively installed on the upper side of the engine. The gasoline fuel injection device includes a gasoline fuel injector 15, a gasoline fuel rail 16 and a gasoline pressure regulator 17. The mixed fuel injection device includes a mixed fuel injection device. 18, a mixed fuel rail 19 and a mixed fuel pressure regulator 20, and a fuel composition identification sensor 21 is integrated on the mixed fuel rail 19. A throttle position sensor 22 is installed on the throttle shaft, a speed sensor 23 to monitor the engine speed and a knock sensor 24 to monitor whether there is knocking in the engine are installed on the engine, and various sensors are connected to the flexible fuel electronics through the wiring harness controller 25. One end of the flexible fuel electronic controller is connected with various sensors, and the other end is connected with a drive unit. The flexible fuel electronic controller 25 is externally connected with a calibration computer 27 and a storage battery 28 . The flexible fuel electronic controller 25 includes a data input processing unit, a central control unit, and an output stage drive unit; the sensor unit is connected to the data input processing unit, and the fuel identification sensor in the sensor unit monitors the methanol content in the mixed fuel tank, and processes through the data input The unit analyzes the input data; the data input processing unit is connected to the central control unit, the central control unit is connected to the output stage drive unit, and the output stage drive unit is connected to the execution unit (as shown in Figure 3). The central control unit contains 11 working modules, one of which is the auxiliary fuel system working module, and the other ten modules are mixed fuel working modules divided according to the methanol content, and the percentage content of methanol is in (0, 10] The module when the percentage content of methanol is at (10,20], the module when the percentage content of methanol is at (20,30], the module when the percentage content of methanol is at (30,40], methanol The module whose percentage content is at (40, 50], the module whose percentage content of methanol is at (50, 60], the module whose percentage content of methanol is at (60, 70], the percentage content of methanol at (70,80] module, the module when the percentage of methanol is at (80,90], the module when the percentage of methanol is at (90,100). According to the data about the methanol content transmitted by the fuel identification sensor Select different working modules to adjust corresponding control parameters, such as ignition advance angle, ignition timing, fuel injection volume, injection time, etc., to ensure reliable engine operation and fuel output at the highest efficiency.

As shown in Figure 2, according to the above-mentioned structure, the control method of the methanol flexible fuel vehicle is as follows: when the ignition switch is powered on, the flexible fuel electronic controller 25 controls the mixed fuel pump relay 4 to open, starts the mixed fuel pump 2, and establishes methanol gasoline The pressure of the mixed fuel system. Since the methanol and gasoline in the mixed fuel tank are in any ratio, the pumped mixed fuel can determine the content of methanol through the fuel identification sensor, so as to choose which way to start. The fuel composition identification sensor 21 monitors whether the methanol content in the mixed fuel is greater than 10%, and if it is greater than 10%, the flexible fuel electronic controller 25 sends an instruction to control the opening of the gasoline oil pump relay 11, the gasoline pump 9 works, and the auxiliary gasoline system pressure is established. The auxiliary fuel system working module in the central control unit starts to work, calculates the gasoline supply, calculates the gasoline ignition angle, and starts the gasoline start working mode of gasoline injection: the gasoline pressure regulator 14 keeps the gasoline injection pressure constant, and the regulated 0.35Mpa pressure The gasoline will be sent to the gasoline injector 15, accept the control instruction of the flexible fuel electronic controller, spray to the flexible fuel engine for combustion, and the excess gasoline will return to the gasoline tank 8 through the gasoline pressure regulator 17 without loss; at the same time, the flexible fuel The fuel electronic controller controls the mixed fuel pump relay to close, and the mixed fuel pump stops working (as shown in Figure 4). If it is detected that the methanol content in the mixed fuel is less than 10%, then start with the mixed fuel system, that is, call the working module whose percentage content of methanol is at (0,10] to start, and the mixed fuel pump 2 is with a pressure greater than 0.35Mpa The mixed fuel is pumped out from the mixed fuel tank 1, flows through the mixed fuel filter 6, removes impurities, and enters the mixed fuel oil rail 19. The mixed fuel pressure regulator 20 keeps the mixed fuel injection pressure constant, and the regulated 0.35Mpa The mixed fuel under pressure will be sent to the mixed fuel injector 18, accept the control command of the flexible fuel electronic controller, and be injected into the flexible fuel engine for combustion, and the excess mixed fuel will return to the mixed fuel tank without loss through the mixed fuel pressure regulator 。Ensure the low-temperature starting performance of the vehicle, and at the same time, the emission during the low-temperature starting process is clean.

After starting, according to the coolant temperature monitored by the flexible fuel engine coolant temperature sensor 26, if it reaches the temperature range of 40° C. to 60° C., it will switch to the methanol-gasoline mixed fuel working mode. According to whether the methanol content in the mixed fuel monitored by the fuel identification sensor is In (0,10] or (10,20] or (20,30] or (30,40] or (40,50] or (50,60] or (60,70] or (70,80] or ( 80, 90] or (90, 100) within 10 intervals, respectively enter into the 5% methanol content working program or 15% methanol content working program or 25% methanol content working program or 35% methanol content working program or 45% methanol content Working program or 55% methanol content working program or 65% methanol content working program or 75% methanol content working program or 85% methanol content working program or 95% methanol content working program, when the fuel composition is constantly changing, the engine can The working data stored in the flexible fuel controller adjusts the corresponding working parameters, such as: ignition timing, ignition advance angle, fuel injection amount, etc., to ensure the best performance output of the engine.

As shown in Figure 5, while the vehicle is running after starting, the failure monitoring mode is also running synchronously. The failure monitoring mode uses the system pressure sensor to monitor the system pressure in real time. If the supply system pressure value deviates from 15% of the normal value of 0.35Mpa, the pressure The sensor sends a signal to the data processing unit, and the data processing unit analyzes the data and transmits it to the central control unit, and the central control unit invokes the fault module to work. If the mixed fuel system is working at this time, and the pressure sensor detects that the pressure of the mixed fuel system deviates from the normal pressure value by 15%, the flexible fuel electronic controller will issue an instruction to turn on the gasoline oil pump relay, and the gasoline oil pump will work to build up the gasoline system pressure. Start the gasoline injection, control the mixed fuel injection to stop at the same time, close the mixed fuel oil pump relay, stop the mixed fuel oil pump, calculate the gasoline supply, calculate the gasoline ignition angle, and start the gasoline injection. When there is a failure in the gasoline working mode, it will switch to the mixed fuel system working mode in the same way as above to ensure the normal operation of the vehicle.

The utility model does not need to use the additive mixed with methanol and gasoline. Realize the mixed use of methanol and gasoline in any ratio from 0 to 100, to achieve the greatest flexibility. Methanol or gasoline or a mixture of the two can be added to the mixed fuel tank at will without using any additives, which saves research and development costs such as the preparation of mixed fuels, reduces vehicle research and development costs and vehicle use costs, and is economical.

Claims (5)

1. A control system for a methanol flexible fuel vehicle, comprising a mixed fuel supply system, an electronic control system and a motor, said mixed fuel supply system comprising a mixed fuel tank, the mixed fuel tank being connected with a mixed fuel pump, characterized in that: The mixed fuel in the mixed fuel tank contains methanol, the percentage content x of methanol is 0<x<100, and the rest is auxiliary fuel; An auxiliary fuel supply system is provided on one side of the mixed fuel supply system, and the auxiliary gasoline supply system includes an auxiliary fuel tank and an auxiliary fuel pump connected with the auxiliary fuel tank; The electronic control system includes a flexible fuel electronic controller, one end of the flexible fuel electronic controller is connected with a sensor unit, and the other end is connected with a drive unit. 2. the control system of a kind of methanol flexible fuel vehicle according to claim 1, is characterized in that: described flexible fuel electronic controller comprises data input processing unit, central control unit, output stage drive unit; Sensor unit is connected with The data input processing unit, the fuel identification sensor in the sensor unit monitors the methanol content in the mixed fuel tank, and analyzes the input data through the data input processing unit; the data input processing unit is connected with the central control unit, and the central control unit is connected with the output stage drive unit, the output stage drive unit is connected to the execution unit. 3. The control system of a methanol flexible fuel vehicle according to claim 2, characterized in that: said central control unit contains 11 groups of working modules, one of which is an auxiliary fuel system working module, and the other ten The modules are mixed fuel working modules divided according to the range of methanol content, respectively, the working module when the percentage of methanol is at (0, 10], the working module when the percentage of methanol is at (10, 20], and the working module when the percentage of methanol is at (10, 20]. The working module when the percentage content is at (20, 30], the working module when the percentage content of methanol is at (30, 40], the working module when the percentage content of methanol is at (40, 50], the percentage of methanol The working module with the content of (50,60], the working module with the percentage of methanol in (60,70], the working module with the percentage of methanol in (70,80], the percentage of methanol in (80,90]), and the working module when the percentage of methanol is at (90,100). 4. The control system of a methanol flexible fuel vehicle according to claim 1, 2 or 3, characterized in that: the sensor unit includes a fuel identification sensor integrated with the fuel rail of the mixed fuel, located on the oil road of the mixed fuel system The mixed fuel system pressure sensor, the mixed fuel oil quantity sensor located in the mixed fuel tank; the auxiliary fuel oil quantity sensor located in the auxiliary fuel tank, the auxiliary fuel system pressure sensor located on the auxiliary fuel system pipe, the speed sensor located on the engine , coolant temperature sensor and knock sensor, throttle position sensor located on the throttle shaft, intake air pressure sensor located in the intake pipe. 5. The control system of a methanol flexible fuel vehicle according to claim 1, 2 or 3, wherein the auxiliary fuel is gasoline or diesel.

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