Automatic starting system for cold start of alcohol fuel engine

Abstract

The utility model discloses an automatic starting system for cold start of an alcohol fuel engine, which belongs to the technical field of alcohol fuel engines and comprises a central processing module, and the output end of the central processing module is connected with the input end of a fuel supply module. When the temperature of cooling liquid is higher than 17 DEG C, the alcohol fuel pump can be automatically controlled to work, alcohol fuel is directly used for ignition starting, additional complex operation is not needed, quick starting in the normal-temperature environment is achieved, and when the temperature of the cooling liquid is lower than 17 DEG C, the system can trigger a series of low-temperature starting processes, so that the starting efficiency is improved. It is ensured that the engine can be smoothly started under the cold condition, the problem that the alcohol fuel engine is difficult to start or cannot be started under the low-temperature environment is effectively solved, in the low-temperature starting process, it is ensured that the engine is smoothly ignited and started at the low temperature, alcohol fuel combustion can be rapidly switched to after starting, and the starting efficiency is improved. The fuel utilization efficiency is improved, and unnecessary consumption of gasoline is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of alcohol fuel engines, and in particular relates to an automatic starting system for cold starting of an alcohol fuel engine. Background Art

[0002] Energy conservation and environmental protection have become an inevitable trend in the development of industries such as passenger cars and construction machinery. Engines have begun to be designed and developed in the direction of using alternative fuels to achieve the goal of increasing shortage of gasoline or diesel resources and reducing emissions. As a result, alcohol fuel engines have emerged. However, passenger cars and construction machinery equipped with alcohol fuel engines have difficulty starting or cannot start at all in low temperature environments.

[0003] The existing engine starting system adopts the cold start technology of combustion chamber preheating. Due to the compact and complex structure of the cylinder head or cylinder block, the preheat plug mounting hole is not easy to set, and there are problems of coolant and oil leakage, or coolant and oil leakage and mixing. The cold start technology using the intake manifold or fuel rail heating has problems such as low fuel heating efficiency, high heating power consumption, long preheating time, and substandard emissions during the engine starting phase. The cold start technology using dual oil rails: Due to the compact and complex structure of the intake manifold, the dual oil rails are not easy to set and the cost is high. The cold start technology using manual gasoline to flush the oil rails, gasoline starting, and then switching to alcohol fuel has problems such as cumbersome operation, inability to accurately control fuel switching, high gasoline consumption, and increased fuel costs. Therefore, an automatic starting system for cold starting of alcohol fuel engines is needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an automatic starting system for cold starting of an alcohol fuel engine, so as to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an automatic starting system for cold starting an alcohol fuel engine, comprising a central processing module, wherein the output end of the central processing module is connected to the input end of a fuel supply module, which is connected to the input end of an electrical control module, which is connected to the input end of a cold start strategy execution module, and the output end of a signal acquisition and feedback module of the electrical control module is connected to the input end of the central processing module; the central processing module includes an ECU, which is connected via wires to an alcohol fuel pump, a gasoline pump, and a normally closed solenoid valve in the fuel supply module, a water temperature sensor, a normally open push button switch, an audible and visual prompt device in the electrical control module, and the negative poles of the electromagnetic coils of relays A and B; The fuel supply module includes an alcohol fuel module, a gasoline supply module and an oil rail and fuel distribution module. The alcohol fuel module includes an alcohol fuel tank. An alcohol fuel pump is provided on the top of the alcohol fuel tank. The gasoline supply module includes a gasoline fuel tank. A gasoline pump is provided on the top of the gasoline fuel tank. The oil outlets of the alcohol fuel pump and the gasoline pump are both connected to a one-way valve through an alcohol fuel pipe, and the two are connected to the oil rail and the oil rail inlet of the fuel distribution module through the one-way valve. The oil rail drain port is connected to a normally closed solenoid valve through an alcohol fuel pipe. The oil rail is used to distribute fuel to the engine injector; the electrical control module includes a power supply and switch control module, a signal acquisition and feedback module and a prompt and warning module. The power supply and switch control module includes a start switch and a battery. The positive pole of the battery is connected to the start switch and the negative pole is connected to the ground. The signal acquisition and feedback module includes a water temperature sensor and a normally open push button switch. A thermostat is provided on one side of the water temperature sensor. The prompt and warning module includes an audible and visual prompt device. The audible and visual prompt device receives an ECU control signal and issues a prompt when the coolant temperature is lower than ℃; The cold start strategy execution module includes a temperature discrimination and start mode selection module, a gasoline flushing and fuel switching module, and a temperature environment parameter monitoring and adjustment module. The working status of the alcohol fuel pump and the gasoline pump are switched by relay A and relay B according to the ECU control signal. The normally open contact of relay A is connected to the positive electrode of the alcohol fuel pump, and the normally open contact of relay B is connected to the positive electrode of the gasoline pump.

[0006] As a preferred embodiment, the alcohol fuel pump outlet is provided with a one-way valve via an alcohol fuel pipe, and the gasoline pump outlet is connected to another one-way valve via an alcohol fuel pipe, and the number of the one-way valves is two.

[0007] As a preferred embodiment, the oil inlet of the oil rail is connected to the alcohol fuel pump and the gasoline pump through the alcohol fuel pipe, and the oil drain port of the oil rail is connected to a normally closed solenoid valve through the alcohol fuel pipe. The oil rail is used to distribute fuel to the engine fuel injectors, and the normally closed solenoid valve is used to control the oil drain backflow of the oil rail.

[0008] As a preferred embodiment, the positive pole of the battery is connected to the start switch, the negative pole of the battery is connected to the ground, a thermostat is provided on one side of the water temperature sensor, the normally open button switch is used to send a signal to the ECU, and the sound and light prompt device receives the control signal of the ECU and emits a "sound" or "light" prompt when the coolant temperature is lower than ℃.

[0009] As a preferred embodiment, the ECU is connected to relay A, relay B, alcohol fuel pump, gasoline pump, normally closed solenoid valve, water temperature sensor, normally open push button switch and sound and light prompt device through wires.

[0010] As a preferred embodiment, the working states of the alcohol fuel pump and the gasoline pump are switched by relay A and relay B according to the control signal of the ECU. The normally open contact pin 87 of relay A is connected to the positive pole of the alcohol fuel pump, the normally open contact pin 87 of relay B is connected to the positive pole of the gasoline pump, and the ECU signal pin is respectively connected to the negative pole pin 86 of the electromagnetic coil of relay A and the electromagnetic coil of relay B.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The utility model accurately collects the engine coolant temperature through the water temperature sensor. When the coolant temperature is higher than 17°C, it can automatically control the operation of the alcohol fuel pump and directly use the alcohol fuel for ignition and starting without additional complicated operations, thereby achieving rapid starting in a normal temperature environment. When the coolant temperature is lower than 17°C, the system will trigger a series of low-temperature starting processes to ensure that the engine can start smoothly under cold conditions, effectively solving the problem that the alcohol fuel engine is difficult to start or cannot start in a low-temperature environment. During the low-temperature starting process, the alcohol fuel in the oil rail is first flushed with gasoline and filled with gasoline, and then automatically switched to the alcohol fuel pump operation according to the preset ambient temperature and time parameters to achieve precise fuel switching, which not only ensures the smooth ignition and starting of the engine at low temperatures, but also can quickly switch to alcohol fuel combustion after starting, thereby improving fuel utilization efficiency and reducing unnecessary gasoline consumption.

[0013] The utility model discloses that when the coolant temperature is lower than 17°C, the sound and light prompt device in the prompt and warning module will receive the control signal of the ECU and send out a "sound" or "light" prompt, so as to promptly remind the driver that a cold start operation is required, so that the driver can intuitively understand the engine status, avoid starting failure or engine damage due to ignorance, and improve the convenience and humanization of operation. Through the preset multiple sets of ambient temperature and time parameters, the system can automatically adjust the starting strategy in different low-temperature environments to ensure that the engine can be reliably started under various cold climate conditions. It can enable alcohol fuel engine vehicles or equipment equipped with the system to operate normally in different regions and seasons without being restricted by low-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main process of the utility model;

[0016] Figure 3 This is a schematic diagram of the fuel supply module of the utility model;

[0017] Figure 4 This is a schematic diagram of the electrical control module of the utility model;

[0018] Figure 5 This is a schematic diagram of the cold start strategy execution module of the utility model.

[0019] In the figure: 1. Alcohol fuel pump; 2. Alcohol fuel tank; 3. Gasoline pump; 4. Gasoline fuel tank; 5. Start switch; 6. Battery; 7. Ground; 8. Normally open push button switch; 9. ECU; 10. Relay A; 11. Relay B; 12. Thermostat; 13. Water temperature sensor; 14. Normally closed solenoid valve; 15. Engine; 16. Fuel rail; 17. One-way valve; 18. Sound and light prompt device; 19. Central processing module; 20. Fuel supply module; 21. Electrical control module; 22. Cold start strategy execution module; 23. Alcohol fuel module; 24. Gasoline supply module; 25. Fuel rail and fuel distribution module; 26. Power supply and switch control module; 27. Signal acquisition and feedback module; 28. Prompt and warning module; 29. ​​Temperature judgment and start mode selection module; 31. Gasoline flushing and fuel switching module; 31. Temperature environment parameter monitoring and adjustment module. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments.

[0021] The following examples are intended to illustrate the present invention and are not intended to limit the scope of protection of the present invention. The conditions in the examples may be further adjusted according to specific conditions. Simple improvements to the method of the present invention based on the concept of the present invention fall within the scope of protection claimed by the present invention.

[0022] See also Figure 1-5 The present invention provides an automatic starting system for cold starting an alcohol fuel engine, comprising a central processing module 19, wherein the output end of the central processing module 19 is connected to the input end of a fuel supply module 20, which is further connected to the input end of an electrical control module 21, which is further connected to the input end of a cold start strategy execution module 22, and the output end of a signal acquisition and feedback module 27 of the electrical control module 21 is further connected to the input end of the central processing module 19; the central processing module 19 comprises an ECU 9, which is connected via wires to the alcohol fuel pump 1, gasoline pump 3, and normally closed solenoid valve 14 in the fuel supply module 20, the water temperature sensor 13, normally open push button switch 8, sound and light prompt device 18 in the electrical control module 21, and the negative poles of the electromagnetic coils of relays A10 and B11; The fuel supply module 20 includes an alcohol fuel module 23, a gasoline supply module 24, and a fuel rail and fuel distribution module 25. The alcohol fuel module 23 includes an alcohol fuel tank 2, on top of which is an alcohol fuel pump 1. The gasoline supply module 24 includes a gasoline fuel tank 4, on top of which is a gasoline pump 3. The oil outlets of the alcohol fuel pump 1 and the gasoline pump 3 are both connected to a one-way valve 17 via an alcohol fuel pipe. The two are also connected to the oil inlet of the oil rail 16 of the fuel distribution module 25 via the one-way valve 17. The oil drain of the oil rail 16 is connected to the normally closed solenoid valve 14 via the alcohol fuel pipe. The oil rail 16 is used to distribute fuel to the fuel injectors of the engine 15. The electrical control module 21 includes a power supply and switch control module 26, a signal acquisition and feedback module 27, and a prompt and warning module 28. The power supply and switch control module 26 includes a start switch 5 and a battery 6. The positive terminal of the battery 6 is connected to the start switch 5 and the negative terminal is connected to the ground 7. The signal acquisition and feedback module 27 includes a water temperature sensor 13 and a normally open push button switch 8. A thermostat 12 is provided on one side of the water temperature sensor 13. The prompt and warning module 28 includes an audio and visual prompt device 18. The audio and visual prompt device 18 receives a control signal from the ECU 9 and issues a prompt when the coolant temperature is lower than 17°C. The cold start strategy execution module 22 includes a temperature determination and start mode selection module 29, a gasoline flushing and fuel switching module 30, and a temperature environment parameter monitoring and adjustment module 31. The operating status of the alcohol fuel pump 1 and the gasoline pump 3 is switched by relay A10 and relay B11 according to the control signal of the ECU 9. The normally open contact of relay A10 is connected to the positive terminal of alcohol fuel pump 1, and the normally open contact of relay B11 is connected to the positive terminal of gasoline pump 3.

[0023] The oil outlet of the alcohol fuel pump 1 is provided with a one-way valve 17 via an alcohol fuel pipe. The oil outlet of the gasoline pump 3 is connected to another one-way valve 17 via an alcohol fuel pipe. There are two one-way valves 17 .

[0024] The oil inlet of the oil rail 16 is connected to the alcohol fuel pump 1 and the gasoline pump 3 through the alcohol fuel pipe. The oil discharge port of the oil rail 16 is connected to the normally closed solenoid valve 14 through the alcohol fuel pipe. The oil rail 16 is used to distribute fuel to the fuel injectors of the engine 15. The normally closed solenoid valve 14 is used to control the oil discharge reflux of the oil rail 16.

[0025] The positive pole of the battery 6 is connected to the start switch 5, and the negative pole of the battery 6 is connected to the ground 7. A thermostat 12 is provided on one side of the water temperature sensor 13. The normally open button switch 8 is used to send a signal to the ECU 9. When the coolant temperature is lower than 17°C, the sound and light prompt device 18 receives the control signal of the ECU 9 and sends a "sound" or "light" prompt.

[0026] The ECU 9 is connected to the relay A10 , the relay B11 , the alcohol fuel pump 1 , the gasoline pump 3 , the normally closed solenoid valve 14 , the water temperature sensor 13 , the normally open push button switch 8 and the sound and light prompt device 18 via wires.

[0027] The working status of alcohol fuel pump 1 and gasoline pump 3 is switched by relay A10 and relay B11 according to the control signal of ECU9. Pin 87 of relay A10 normally open contact is connected to the positive pole of alcohol fuel pump 1, and pin 87 of relay B11 normally open contact is connected to the positive pole of gasoline pump 3. The signal pin of ECU9 is connected to pin 86 of the negative pole of relay A10 solenoid coil and relay B11 solenoid coil respectively.

[0028] Turn on the start switch 5 and power on the vehicle. ECU9 collects the signal of the water temperature sensor 13 installed on the thermostat 12 to determine the coolant temperature of the engine 15. When the coolant temperature is higher than 17°C, the vehicle does not make a "sound" or "light" prompt. At this time, the alcohol fuel pump 1 is working and ignition can be directly performed with alcohol fuel. When the coolant temperature is lower than 17°C, the vehicle will make a "sound" or "light" prompt and a cold start is required. At this time, turn off the vehicle power / start switch 5, press the normally open push button switch 8 and do not let go. Then turn on the start switch 5. At this time, the gasoline pump 3 is working and the alcohol fuel in the fuel rail 16 is flushed clean with gasoline and filled with gasoline. The flushed alcohol fuel returns to the alcohol fuel tank 2. The flushing time is 3 seconds, which is the ECU9 self-test time. Ignition can be performed. Afterwards, ECU9 automatically switches to the operation of the alcohol fuel pump 1 according to the two conditions of the set time and the coolant temperature. When either value of the set time and temperature meets the requirements, the gasoline pump 3 is stopped and the alcohol fuel pump 1 is started and works at the same time.

[0029] When the ambient temperature is between 12°C and 0°C, if the time after starting reaches 2 seconds or the coolant temperature reaches 16°C, ECU9 controls relay B11 to stop working, gasoline pump 3 stops delivering gasoline, and at the same time controls relay A10 to work, alcohol fuel pump 1 starts working, and alcohol fuel is delivered from alcohol fuel tank 2 through alcohol fuel pump 1 and one-way valve 17 to fuel rail 16. The engine switches to using alcohol fuel, completing the cold start process, and the vehicle enters normal operating state.

[0030] When the ambient temperature is between 0℃ and 15℃, if the time after starting reaches 10 seconds or the coolant temperature reaches 16℃, perform the same fuel switching operation.

[0031] When the ambient temperature is between -15°C and 22°C, if the time after starting reaches 25 seconds or the coolant temperature reaches 16°C, perform the same fuel switching operation.

[0032] The working principle and use process of the utility model are as follows: first, after the driver enters the vehicle, he normally operates the start switch 5, the system automatically starts to work, the ECU 9 collects the signal of the water temperature sensor 13 and determines the engine coolant temperature. When the coolant temperature is higher than 17°C, the driver does not need to perform additional operations, the alcohol fuel pump 1 works, the engine directly uses the alcohol fuel for ignition and start, and the vehicle operates normally. Then, when the coolant temperature is lower than 17°C, the sound and light prompt device 18 sends a prompt signal, the driver operates according to the system prompt, turns off the start switch 5, presses the normally open button switch 8 and keeps it pressed, and turns on the start switch 5 again. At this time, the gasoline pump 3 starts to work and delivers gasoline to the oil rail 16, flushes out the alcohol fuel in the oil rail 16 and fills it with gasoline. The flushing time is 3 seconds. During the washing process, the normally closed solenoid valve 14 is opened, and the flushed alcohol fuel flows back into the alcohol fuel tank 2. Finally, after 3 seconds, the driver can release the normally open push button switch 8. At this time, the system automatically determines according to the time and coolant temperature conditions set by ECU9. If the set conditions are met, the gasoline pump 3 stops working, the alcohol fuel pump 1 starts working, the engine switches to using alcohol fuel, completing the cold start process, and the vehicle enters normal operating state. During the engine operation, the system continuously monitors various parameters of the engine to ensure the normal operation of the engine. If the engine has an abnormal situation, such as the coolant temperature is too high, the fuel supply is insufficient, etc., ECU9 will take corresponding measures according to the preset program, such as issuing an alarm signal, adjusting the engine operating parameters, etc., to protect the engine and ensure the safe operation of the vehicle.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic starting system for cold starting an alcohol fuel engine, comprising a central processing module (19), characterized in that: The output end of the central processing module (19) is connected to the input end of the fuel supply module (20), the output end of the fuel supply module (20) is connected to the input end of the electrical control module (21), the output end of the electrical control module (21) is connected to the input end of the cold start strategy execution module (22), and the output end of the signal acquisition and feedback module (27) of the electrical control module (21) is connected to the input end of the central processing module (19); the central processing module (19) includes an ECU (9), and the ECU (9) is connected to the alcohol fuel pump (1), the gasoline pump (3), the normally closed solenoid valve (14) in the fuel supply module (20), the water temperature sensor (13), the normally open button switch (8), the sound and light prompt device (18) in the electrical control module (21), and the negative poles of the electromagnetic coils of relay A (10) and relay B (11) through wires; The fuel supply module (20) comprises an alcohol fuel module (23), a gasoline supply module (24) and an oil rail and fuel distribution module (25), wherein the alcohol fuel module (23) comprises an alcohol fuel tank (2), wherein an alcohol fuel pump (1) is provided on the top of the alcohol fuel tank (2), and the gasoline supply module (24) comprises a gasoline fuel tank (4), wherein a gasoline pump (3) is provided on the top of the gasoline fuel tank (4), wherein the oil outlets of the alcohol fuel pump (1) and the gasoline pump (3) are both connected to a one-way valve (17) via an alcohol fuel pipe, and the two are connected to an oil inlet of an oil rail (16) of the fuel distribution module (25) via the one-way valve (17), and the oil drain port of the oil rail (16) is connected to a normally closed solenoid valve (14) via an alcohol fuel pipe, and the oil rail (16) is used to distribute fuel to the fuel injectors of the engine (15); The electrical control module (21) includes a power supply and switch control module (26), a signal acquisition and feedback module (27) and a prompt and warning module (28), wherein the power supply and switch control module (26) includes a start switch (5) and a battery (6), wherein the positive electrode of the battery (6) is connected to the start switch (5) and the negative electrode is connected to the ground (7), wherein the signal acquisition and feedback module (27) includes a water temperature sensor (13) and a normally open push button switch (8), wherein a thermostat (12) is provided on one side of the water temperature sensor (13), and wherein the prompt and warning module (28) includes an audible and visual prompt device (18), wherein the audible and visual prompt device (18) receives a control signal from the ECU (9) and issues a prompt when the coolant temperature is lower than 17°C; The cold start strategy execution module (22) includes a temperature discrimination and start mode selection module (29), a gasoline flushing and fuel switching module (30), and a temperature environment parameter monitoring and adjustment module (31). The working states of the alcohol fuel pump (1) and the gasoline pump (3) are switched by relay A (10) and relay B (11) according to the control signal of the ECU (9). The normally open contact of the relay A (10) is connected to the positive electrode of the alcohol fuel pump (1), and the normally open contact of the relay B (11) is connected to the positive electrode of the gasoline pump (3).

2. The automatic starting system for cold starting of an alcohol fuel engine according to claim 1, characterized in that: The oil outlet of the alcohol fuel pump (1) is provided with a one-way valve (17) via an alcohol fuel pipe, and the oil outlet of the gasoline pump (3) is connected to another one-way valve (17) via the alcohol fuel pipe. The number of the one-way valves (17) is two.

3. The automatic starting system for cold starting of an alcohol fuel engine according to claim 1, characterized in that: The oil inlet of the oil rail (16) is connected to the alcohol fuel pump (1) and the gasoline pump (3) through the alcohol fuel pipe, and the oil discharge port of the oil rail (16) is connected to the normally closed solenoid valve (14) through the alcohol fuel pipe. The oil rail (16) is used to distribute fuel to the fuel injection nozzle of the engine (15), and the normally closed solenoid valve (14) is used to control the oil discharge reflux of the oil rail (16).

4. The automatic starting system for cold starting of an alcohol fuel engine according to claim 1, characterized in that: The positive electrode of the battery (6) is connected to the start switch (5), and the negative electrode of the battery (6) is connected to the ground (7). A thermostat (12) is provided on one side of the water temperature sensor (13). The normally open button switch (8) is used to send a signal to the ECU (9). When the coolant temperature is lower than 17°C, the sound and light prompt device (18) receives the control signal from the ECU (9) and sends a "sound" or "light" prompt.

5. The automatic starting system for cold starting of an alcohol fuel engine according to claim 1, characterized in that: The ECU (9) is connected to the relay A (10), the relay B (11), the alcohol fuel pump (1), the gasoline pump (3), the normally closed solenoid valve (14), the water temperature sensor (13), the normally open push button switch (8) and the sound and light prompt device (18) via wires.

6. The automatic starting system for cold starting of an alcohol fuel engine according to claim 5, characterized in that: The working states of the alcohol fuel pump (1) and the gasoline pump (3) are switched by relay A (10) and relay B (11) according to the control signal of ECU (9), the normally open contact pin 87 of relay A (10) is connected to the positive electrode of the alcohol fuel pump (1), the normally open contact pin 87 of relay B (11) is connected to the positive electrode of the gasoline pump (3), and the signal pins of ECU (9) are respectively connected to the negative electrode pin 86 of the electromagnetic coil of relay A (10) and the electromagnetic coil of relay B (11).

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