CN102588135A - Device for improving performance of ignition type internal combustion engine with dimethyl ether and control method - Google Patents

Abstract

A device and a control method for improving the starting and idling performance of an ignition internal combustion engine by using dimethyl ether belong to the field of internal combustion engines. The device mainly includes a DME tank, a DME pressure regulator, a DME nozzle, and a DME electronic control unit for controlling DME injection, as well as the fuel injection timing signal issued by the original engine ECU , fuel injection pulse width signal and transmitted vehicle speed sensor signal, accelerator pedal position signal, oxygen sensor signal and knock sensor signal, etc. Its advantage is that it can significantly improve the atomization and mixing of fuel and air under the idling and cold start conditions of the engine, improve the overall combustion performance of the engine, and reduce the emission of harmful substances. The device has a simple design and structure, is easy to install and has low cost. At the same time, the system also has good adaptability and expandability, and can be easily installed on different types of engines. It has broad market prospects and good economic benefits.

Description

Device and Control Method for Improving Performance of Ignition Internal Combustion Engine with Dimethyl Ether

technical field

The invention provides a device and a control method for improving the starting and idling performance of an ignition internal combustion engine by using dimethyl ether, and specifically relates to a fuel supply, combustion control and operation mode of the internal combustion engine, belonging to the field of internal combustion engines.

Background technique

With the continuous popularization and application of automobiles, the energy shortage and emission pollution caused by them have become the focus of social attention, and they are also one of the problems that restrict their own development and need to be solved urgently. Due to many objective problems in cold start and idling of traditional ignition gasoline engine, it has become the focus of research on engine improvement and performance improvement. Firstly, the ambient temperature and the low temperature of the wall surface of the combustion chamber lead to uneven mixing of the liquid fuel and the air mixture. When entering the combustion chamber, the fuel evaporates insufficiently and forms an oil film; secondly, when the engine starts cold and idles, due to the low speed, the Poor gas fluidity and other reasons lead to problems such as uneven mixing of oil and gas, excessive residual exhaust gas in the combustion chamber, and insufficient combustion of the mixture; finally, in order to ensure the smooth start of the engine, the engine electronic control unit usually uses methods such as increasing the amount of fuel injection to enrich the mixture. Gas to ensure that the starting requirements of the engine are met under the condition that the fuel evaporation is small. When the engine is in cold start and idling conditions, the three-way catalytic converter does not start to work due to the low temperature, so that a large amount of HC and CO emissions are directly discharged into the atmosphere without catalytic conversion. According to the research data, 80-85% of the HC and CO emissions during the entire use of the vehicle are generated during the cold start and idling of the gasoline engine, especially during the warm-up idling phase. To sum up, improving the combustion, operating conditions and emission conditions of the engine during cold start and idling has become the main research direction of the current engine. The use of gaseous new energy fuel as the fuel for engine cold start and idling has become an ideal solution. Gaseous fuel is not only easy to mix with air at low temperature and does not form an oil film, but also improves the uniformity of fuel mixing. , Improve the combustion condition, and then reduce the emission of harmful substances.

Contents of the invention

In order to improve the performance of an ignition internal combustion engine at cold start and idle speed, the present invention proposes a device and a control method for improving the performance of an ignition internal combustion engine with dimethyl ether.

The present invention adopts following technical scheme:

A device for improving the performance of an ignition-type internal combustion engine with dimethyl ether, which is used to improve the performance of an ignition-type internal combustion engine at cold start and idle speed, including a dimethyl ether tank 1, a dimethyl ether regulator 2, a dimethyl ether nozzle 3 and dimethyl ether The ether electronic control unit 4 and the original engine fuel nozzle 5, the fuel injection timing signal a1, the fuel injection pulse width signal a2, the dimethyl ether injection pulse width signal a3, the injection timing signal a4 and The vehicle speed sensor signal b1, accelerator pedal position signal b2, engine oxygen sensor signal b3, and engine knock sensor signal b4 collected and transmitted by the electronic control unit of the original machine are input to the DME electronic control unit 4; The feedback signal c sent out is input to the electronic control unit of the original engine; the dimethyl ether tank 1, the dimethyl ether regulator 2 and the dimethyl ether nozzle 3 are connected in sequence, and the dimethyl ether electronic control unit 4 reads from the electronic control unit of the original engine Take and feed back data signals, and connect with dimethyl ether nozzle 3 so that it can inject dimethyl ether. The dimethyl ether electronic control unit 4 is also connected with the fuel nozzle 5 of the original machine, and the dimethyl ether nozzle 3 is connected near the intake manifold. At the intake port, inject dimethyl ether into the intake port;

Described ignition type internal combustion engine comprises gasoline, methanol, ethanol fuel ignition type internal combustion engine;

The control method of the device for improving the performance of an ignition-type internal combustion engine with dimethyl ether includes the following control process:

关系转化成二甲醚喷射脉宽信号a3并发送到二甲醚喷嘴3，将燃料喷射脉宽信号a2直接转化成为二甲醚喷嘴3的二甲醚喷射时刻信号a4，二甲醚喷射脉宽信号a3和二甲醚喷射时刻信号a4以发动机能够正常起动且不出现失火或爆震现象为准并有±3％的调整幅度；1) When the engine power is turned on, the dimethyl ether electronic control unit 4 reads the vehicle speed sensor signal b1 from the original engine electronic control unit as 0km/h and the accelerator pedal position signal b2 is at the initial 0 position, the dimethyl ether electronic control unit 4 Unit 4 closes the fuel nozzle of the original machine, and at the same time compiles the received fuel injection timing signal a1 and fuel injection pulse width signal a2 from the original engine electronic control unit, and compiles the corresponding DME injection pulse width signal a3 and DME The ether injection time signal a4 is transmitted to the dimethyl ether nozzle 3 to realize that dimethyl ether is used as the fuel of the ignition engine under cold start and idling conditions; and ignition timing are managed and controlled by the electronic control unit of the original machine. The dimethyl ether electronic control unit 4 transmits the fuel injection timing signal a1 through

The relationship is converted into the DME injection pulse width signal a3 and sent to the DME nozzle 3, and the fuel injection pulse width signal a2 is directly converted into the DME injection timing signal a4 of the DME nozzle 3, and the DME injection pulse width Signal a3 and dimethyl ether injection timing signal a4 are based on the fact that the engine can start normally without misfire or knocking, and have an adjustment range of ±3%;

2) When the dimethyl ether electronic control unit 4 detects that the vehicle speed sensor signal b1 is greater than 0km/h, or the accelerator pedal position signal b2 is not at 0 position, feed back the dimethyl ether electronic control unit 4 to the original engine electronic control unit feedback signal c, close the dimethyl ether nozzle 3, and directly transmit the fuel injection timing signal a1 and fuel injection pulse width signal a2 sent by the original engine electronic control unit to the original engine fuel nozzle 5. Engine operation is controlled;

3) When the dimethyl ether electronic control unit 4 detects that the signal b3 of the engine oxygen sensor exceeds the variation range of 0.2-0.9V by more than 3% or the signal of the engine knock sensor exceeds the variation range of 0.4-1.3V by more than 3%, or the knock sensor When the deviation between the signal voltages of each cylinder is greater than 50%, the dimethyl ether electronic control unit 4 feeds back the feedback signal c of the dimethyl ether electronic control unit 4 to the engine original motor electronic control unit, and the injection amount and injection time of dimethyl ether Make adjustments for proper engine operation.

The beneficial effect of the present invention is to propose a device and control method for improving the starting and idling performance of an ignition-type internal-combustion engine by using dimethyl ether for the combustion and emission problems existing in the cold start and idle speed of the traditional ignition-type internal-combustion engine. The internal combustion engine of the present invention adopts the dimethyl ether ignition mode, and according to the operating conditions of the internal combustion engine, the fuel injection pulse width and injection timing are adjusted by the engine original machine electric control unit and sent to the dimethyl ether electronic control unit 4, and the dimethyl ether The electronic control unit 4 adjusts relevant parameters and injects it through the dimethyl ether nozzle 3 to meet the fuel requirements of the internal combustion engine during cold start and idling stages.

It is a convenient and feasible technical route to use dimethyl ether ignition type combustion method to improve and improve the combustion and emission performance of the engine in cold start and idling conditions. The fuel injection pulse width and injection timing are calculated and adjusted, and the data is transmitted to the DME nozzle 3 to inject DME, so as to improve the performance of the engine at cold start and idle speed, and reduce the emission of this operating condition. When the vehicle starts or the driver steps on the accelerator pedal, the dimethyl ether electronic control unit 4 closes the dimethyl ether nozzle 3, and directly sends the fuel injection pulse width and injection time sent by the original machine electronic control unit to the original machine fuel nozzle, Take original machine control. By adopting the above combustion mode of dimethyl ether start-up and idling speed, the optimized control and combustion of the traditional ignition internal combustion engine at different stages are realized, the starting performance is improved, and the fuel consumption and emission are reduced. Therefore, it is a simple and practical method to improve the performance of the internal combustion engine. technical means.

Description of drawings

Fig. 1 structure and working principle diagram of the present invention;

Figure 2-1

Figure 2-2

Figure 2-3

Figure 2-4

Figure 2-5

In the figure, 1 DME tank, 2 DME pressure regulator, 3 DME nozzle, 4 electronic control unit DME electronic control unit, original fuel nozzle 5, a1 fuel injection timing signal, a2 fuel injection pulse width Signal, a3 DME injection pulse width signal, a4 DME injection timing signal, b1 vehicle speed sensor signal, b2 accelerator pedal position signal, b3 engine oxygen sensor signal, b4 engine knock sensor signal, c DME electronic control unit Feedback signal

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

A device for improving the performance of an ignition-type internal combustion engine with dimethyl ether, the device is used to improve the performance of an ignition-type internal combustion engine at cold start and idle speed, including a dimethyl ether tank 1, a dimethyl ether regulator 2, a dimethyl ether nozzle 3 and a control device 2 Dimethyl ether injection electronic control unit DME electronic control unit 4 and original machine fuel nozzle 5, fuel injection timing signal a1, fuel injection pulse width signal a2, and dimethyl ether injection pulse width signal sent by the engine original machine electronic control unit a3, injection timing signal a4, vehicle speed sensor signal b1, accelerator pedal position signal b2, engine oxygen sensor signal b3, engine knock sensor signal b4 collected and transmitted by the original engine electronic control unit are input to the electronic control unit DME electronics Control unit 4; the feedback signal c sent by the dimethyl ether electronic control unit 4 is input to the original machine electric control unit; the dimethyl ether tank 1, the dimethyl ether regulator 2 and the dimethyl ether nozzle 3 are connected in sequence, and the electronic control unit The dimethyl ether electronic control unit 4 reads and feeds back data signals from the original engine electronic control unit, and is connected with the dimethyl ether nozzle 3 so that it can inject dimethyl ether, and the electronic control unit dimethyl ether electronic control unit 4 is also connected to the original The engine fuel nozzle 5 is connected, and the dimethyl ether nozzle 3 is connected to the intake manifold near the intake port, and dimethyl ether is injected into the intake port.

The above-mentioned device has made the following experiments on cold start and idle speed conditions:

The experiment was carried out on a Beijing Hyundai Elantra equipped with an in-line 4-cylinder 1.6L EFI gasoline engine, and a device for improving the starting and idling performance of the ignition internal combustion engine was added with dimethyl ether as shown in Figure 1. A Horiba-7100DEGR emission analyzer produced by Horiba Co., Ltd. was used to measure the HC, CO and NO _x emissions of the internal combustion engine under various operating conditions.

Start the engine, the electronic control unit dimethyl ether electronic control unit 4 receives the vehicle speed sensor signal b1 and the accelerator pedal position signal b2, the two signals are at zero position, and then the electronic control unit dimethyl ether electronic control unit 4 sends the original machine electronic control unit The fuel injection timing signal a1 and the fuel injection pulse width signal a2 are converted, and the signal is transmitted to the DME nozzle 3, and the DME nozzle 3 injects DME.

After the engine starts smoothly, the electronic control unit dimethyl ether electronic control unit 4 continues to receive and detect whether the vehicle speed sensor signal b1 and the accelerator pedal position signal b2 are at the zero position. , the electronic control unit dimethyl ether electronic control unit 4 continues to convert the fuel injection timing signal a1 and the fuel injection pulse width signal a2 sent by the original machine electronic control unit, and transmits the signal to the dimethyl ether nozzle 3. The ether nozzle 3 sprays dimethyl ether.

During the normal operation of the engine, depress the accelerator pedal to the 5% position, and when the electronic control unit dimethyl ether electronic control unit 4 detects that the accelerator pedal position signal b2 is not zero, it stops the dimethyl ether nozzle 3 from injecting dimethyl ether, and the original The fuel injection timing signal a1 and the fuel injection pulse width signal a2 sent by the electromechanical control unit are directly transmitted to the gasoline nozzle.

When the gear is engaged and the accelerator pedal is pressed to the 10% position, the vehicle starts, the vehicle speed is 20km/h, and the electronic control unit dimethyl ether electronic control unit 4 detects that both the vehicle speed sensor signal b1 and the accelerator pedal position signal b2 are not at the zero position, continue Close the DME nozzle 3 and directly transmit the fuel injection timing signal a1 and the fuel injection pulse width signal a2 sent by the electronic control unit of the original machine to the gasoline nozzle.

When the vehicle slides at a speed of 15km/h without stepping on the accelerator pedal, when the electronic control unit DME electronic control unit 4 detects that the signal b1 of the vehicle speed sensor is not zero, continue to close the DME nozzle 3 and switch the original ECU The fuel injection timing signal a1 and the fuel injection pulse width signal a2 are sent directly to the gasoline nozzle.

When the vehicle stops, the vehicle speed is zero, the accelerator pedal is not stepped on, the engine speed is stable at 791r/min, and the electronic control unit dimethyl ether electronic control unit 4 detects that the vehicle speed sensor signal b1 and the accelerator pedal position signal b2 both return to the zero position, the shutdown The gasoline nozzle of the original machine opens the DME nozzle 3, and transmits the fuel injection timing signal a1 and the fuel injection pulse width signal a2 sent by the electronic control unit of the original machine to the DME nozzle 3 after compilation.

In the embodiment, adopt dimethyl ether to improve the starting and idling performance of the spark-ignition internal combustion engine and the energy flow of the cold starting and idling of the original engine of gasoline, the engine speed and CO emissions, HC emissions, NOx measured by the Horiba-7100DEGR emission analyzer Parameters such as emissions are shown in Figure 2-1 to Figure 2-5. Since DME is a gaseous fuel with a high cetane number, its flash point is -24°C, it has good ignition performance and is easy to ignite. Compared with gasoline, the uniformity of atomization is greatly improved. At the same time, due to its easy cold start and rapid combustion, the emissions are greatly reduced.

Test the engine installed with dimethyl ether to improve ignition-type internal-combustion engine starting and idling performance device, the results show that the device and control method for improving ignition-type internal-combustion engine starting and idling performance by adopting dimethyl ether provided by the present invention can effectively Improves the thermal efficiency of combustion in conventional ignition engines during cold start and idle conditions while reducing emissions. This technology will provide an effective technical way for vehicle internal combustion engines to meet Euro V and above emission standards and reduce the use and consumption of oil and fuel.

Claims (3)

1. dimethyl ether improves the device of ignition internal combustion engine performance; It is characterized in that: the performance when this device is used to improve ignition internal combustion engine cold starting and idling; Comprise the dimethyl ether electronic control unit (4) that dimethyl ether jar (1), dimethyl ether pressure governor (2), dimethyl ether nozzle (3) and control dimethyl ether spray, fuel injection time point signal a1, fuel injection pulsewidth signal a2, dimethyl ether injection pulse width signal a3, time for spraying signal a4 that is sent by the former dynamo-electric control of motor unit and vehicle speed sensor signal b1, acceleration pedal position signal b2, motor oxygen sensor signal b3, the engine knock sensors signal b4 that is collected and transmitted by the former dynamo-electric control of motor unit are input to dimethyl ether electronic control unit (4); The feedback signal c that is sent by dimethyl ether electronic control unit (4) is input to former dynamo-electric control unit; Dimethyl ether jar (1), dimethyl ether pressure governor (2) and dimethyl ether nozzle (3) are connected successively; Dimethyl ether electronic control unit (4) reads and the feedback data signal from the former dynamo-electric control of motor unit; And link to each other with dimethyl ether nozzle (3) and to make it can spray dimethyl ether; Dimethyl ether electronic control unit (4) also links to each other with former machine fuel nozzle (5), and dimethyl ether nozzle (3) is connected intake manifold near the intake duct place, and dimethyl ether is ejected in the intake duct.

2. dimethyl ether according to claim 1 improves the device of ignition internal combustion engine performance, it is characterized in that, described ignition internal combustion engine comprises gasoline, methyl alcohol, alcohol fuel ignition internal combustion engine.

3. the described dimethyl ether of claim 1 improves the controlling method of the device of ignition internal combustion engine performance, it is characterized in that:

1) after connecting the motor power supply; Dimethyl ether electronic control unit (4) reads vehicle speed sensor signal b1 from the former dynamo-electric control of motor unit be that 0km/h and acceleration pedal position signal b2 are when being positioned at initial 0 position; Dimethyl ether electronic control unit (4) is closed former machine fuel nozzle; The fuel injection time point signal a1 and the fuel injection pulsewidth signal a2 that simultaneously the former dynamo-electric control of the motor that receives unit are sent compile; Corresponding dimethyl ether injection pulse width signal a3 and dimethyl ether time for spraying signal a4 are passed to dimethyl ether nozzle (3), realize dimethyl ether fuel as spark-ignition engine under cold starting and idling operation; In the operation process that dimethyl ether acts as a fuel; The emitted dose of fuel, time for spraying and time of ignition etc. are by the control of former dynamo-electric control Single Component Management; Dimethyl ether electronic control unit (4) concerns fuel injection time point signal a1 according to the air fuel ratio of dimethyl ether and gasoline and calorific value and changes into dimethyl ether injection pulse width signal a3 and send to dimethyl ether nozzle (3) through ; Fuel injection pulsewidth signal a2 is directly transformed into the dimethyl ether time for spraying signal a4 of dimethyl ether nozzle (3), and dimethyl ether injection pulse width signal a3 and dimethyl ether time for spraying signal a4 can normal startings with motor and are not occurred catching fire or phenomenon of detonation is as the criterion and have ± 3% adjusting range;

2) when dimethyl ether electronic control unit (4) detects the vehicle speed sensor signal b1 speed of a motor vehicle greater than 0km/h; Or acceleration pedal position signal b2 is not when being in 0 position; Feedback signal c to the former dynamo-electric control unit feedback dimethyl ether electronic control unit of motor (4); Close dimethyl ether nozzle (3); Fuel injection time point signal a1, fuel injection pulsewidth signal a2 that the former dynamo-electric control of motor unit is sent are directly passed to former machine fuel nozzle (5), by the former dynamo-electric control of motor unit motor are moved and control;

3) when dimethyl ether electronic control unit (4) detect excursion that motor oxygen sensor signal b3 surpasses 0.2-0.9V 3% or more or the engine knock sensors signal above the excursion of 0.4-1.3V more than 3%; Perhaps the deviation between each cylinder signal voltage of detonation sensor was greater than 50% o'clock; Dimethyl ether electronic control unit (4) is to the feedback signal c of the former dynamo-electric control unit feedback dimethyl ether electronic control unit of motor (4); Emitted dose and time for spraying to dimethyl ether are adjusted, to satisfy the normal working of engine requirement.

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