A liquid spray control device

Abstract

The utility model discloses a kind of liquid injection control devices, including engine, engine has intake manifold on it, engine is connected with exhaust pipe, exhaust gas generated by engine is exported through exhaust pipe, controller, controller is connected with engine;Liquid storage tank, containing space is used to accommodate liquid medium;Liquid pump, liquid inlet end of liquid pump is communicated with liquid storage tank by liquid inlet pipe, liquid outlet end of liquid pump is communicated with multiple nozzles by liquid injection pipe, signal input end of liquid pump is connected with signal output end of controller;Nitrogen oxygen sensor, nitrogen oxygen sensor is arranged on the exhaust end of exhaust pipe, signal output end of nitrogen oxygen sensor is connected with signal input end of controller.The utility model can make methanol and fuel realize more uniform, sufficient mixing at intake manifold by accurate dynamic matching methanol injection amount, methanol can promote complete combustion of main fuel in combustion process, significantly reduce nitrogen oxide emission, while improve the dynamic of engine to energy-saving environmental protection effect.

Description

Technical Field

[0001] This utility model relates to the field of engines, and in particular to a liquid injection control device. Background Technology

[0002] Currently, in order to meet stricter emission regulations, engines are employing strategies such as multi-pulse injection to achieve different combustion modes and paths, thereby achieving ultra-low emissions.

[0003] Chinese patent document CN118257683A discloses a method and system for controlling the purification and emission reduction of non-road engines. It includes: acquiring engine operating condition signals; the ECU controlling an injection device to inject fuel from a first container and / or liquid from a second container into the engine based on the operating condition signals; the liquid in the second container includes either a solution or purified water. In the prior art, non-road engines easily produce exhaust gases such as nitrogen oxides and are more likely to emit particulate matter. While water lowers the engine temperature, the injected water mist also reduces the concentration of oil mist within the engine, thereby lowering the overall octane rating of the fuel and affecting the engine's power output. Methanol itself is also a fuel; without lowering the engine's octane rating, it can lower the engine temperature, prevent knocking, and better improve engine efficiency, promote complete combustion, and more effectively reduce nitrogen oxide emissions.

[0004] Compared to existing technologies, this invention mixes fuel and solution and injects it into the engine. When the solution enters the engine, it cools the engine, thereby preventing engine knocking and reducing the generation of exhaust gases such as nitrogen oxides. This allows for more complete combustion of fuel and reduces the emission of particulate matter.

[0005] The existing control system is not adaptable enough to different engine operating conditions, and cannot accurately adjust injection parameters according to different operating conditions, resulting in incomplete fuel combustion. Therefore, it is necessary to improve the structure to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this invention is to provide a liquid injection control device to address the shortcomings of existing control systems in adapting to engine operating conditions, which are unable to accurately adjust injection parameters according to different operating conditions, resulting in incomplete fuel combustion.

[0007] The above-mentioned technical objective of this utility model is achieved by the following technical solution:

[0008] A liquid injection control device includes an engine with an intake manifold, connected to an exhaust pipe, and whose exhaust gases are output through the exhaust pipe. The device further includes a controller whose signal input terminal is connected to the engine's signal output terminal. The controller receives liquid injection pulse width, speed, and load signals from the engine and generates control commands based on these signals. A liquid reservoir has an internal space for containing a liquid medium. A liquid pump has an inlet connected to the reservoir via an inlet pipe and an outlet connected to multiple nozzles via a spray pipe. The spray ends of the multiple nozzles are positioned towards the intake manifold. The liquid pump's signal input is connected to the controller's signal output. The liquid pump receives control commands from the controller and executes actions accordingly. The nitrogen oxide sensor is located at the exhaust end of the exhaust pipe. Its signal acquisition end is inside the exhaust pipe, and its signal output is connected to the controller's signal input. The nitrogen oxide sensor collects exhaust gas data and transmits it to the controller. A thawing U-tube is partially located inside the reservoir. Its input and output ends are connected to the engine coolant tank. A hot water valve is installed on the thawing U-tube to control its on / off state.

[0009] A further feature of this application is that the controller is an FCU controller, which is used to adjust the injection volume of the liquid medium.

[0010] A further feature of this application is that a thawing and heating sleeve is installed on the spray pipe, the thawing and heating sleeve is connected to the signal output terminal of the controller, and the thawing and heating sleeve is used to heat the spray pipe.

[0011] A further feature of this application is that the liquid storage tank contains an alcohol-based liquid medium.

[0012] A further feature of this application is that a plurality of solenoid valves are installed on the spray pipe, the signal input terminal of the solenoid valves is connected to the signal output terminal of the controller, and the solenoid valves are used to realize the opening and closing of the spray pipe.

[0013] A further feature of this application is that it also includes a thermometer, the temperature sensing end of which is located inside the liquid storage tank, and the thermometer is used to detect the temperature inside the liquid storage tank.

[0014] A further feature of this application is that it also includes a level gauge, wherein the level detection end of the level gauge is located inside the storage tank, and the level gauge is used to detect the level of liquid in the storage tank.

[0015] A further feature of this application is that it also includes a hydraulic sensor, the hydraulic detection end of which is located inside the inlet pipe, and the signal output end of which is connected to the controller. The hydraulic sensor is used to acquire the pressure signal inside the inlet pipe and transmit it to the controller.

[0016] A further feature of this application is that it also includes a return pipe, one end of which is connected to the spray pipe and the other end of which is connected to the storage tank, and a pressure stabilizing valve is installed at the connection between the return pipe and the spray pipe.

[0017] In summary, this utility model has the following beneficial effects:

[0018] By precisely and dynamically matching the methanol injection amount, methanol and fuel can be mixed more evenly and fully at the intake manifold. During combustion, methanol can promote the complete combustion of the main fuel, reduce nitrogen oxide emissions caused by the high temperature and oxygen-rich environment of combustion, and improve the energy release efficiency of the fuel. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the present invention. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with the illustrations and specific embodiments.

[0021] like Figure 1 As shown, a liquid injection control device includes an engine with an intake manifold, the engine being connected to an exhaust pipe, and exhaust gas generated by the engine being output through the exhaust pipe. It also includes...

[0022] The controller's signal input terminal is connected to the engine's signal output terminal. The controller is used to receive the injection pulse width, speed, and load signals from the engine, and to generate control commands based on the injection pulse width, speed, and load signals.

[0023] A liquid storage tank, the interior of which has a containment space for holding liquid media;

[0024] The liquid pump has its inlet end connected to the storage tank via an inlet pipe, and its outlet end connected to multiple nozzles via a spray pipe. The spray ends of the multiple nozzles are set towards the air intake manifold. The signal input end of the liquid pump is connected to the signal output end of the controller. The liquid pump is used to receive control commands from the controller and execute actions according to the control commands.

[0025] The nitrogen oxide sensor is installed on the exhaust end of the exhaust pipe. The signal acquisition end of the nitrogen oxide sensor is located inside the exhaust pipe, and the signal output end of the nitrogen oxide sensor is connected to the signal input end of the controller. The nitrogen oxide sensor is used to collect the exhaust gas data output from the exhaust pipe and transmit the exhaust gas data to the controller.

[0026] The thawing U-tube has a portion located inside the reservoir. The inlet and outlet of the thawing U-tube are connected to the engine water tank, respectively. The hot water from the engine water tank can flow through the reservoir via the thawing U-tube. A hot water valve is installed on the thawing U-tube to control the on / off state of the thawing U-tube.

[0027] The controller employs an FCU (Fluid Control Unit), which adjusts the injection quantity of the liquid medium. An FCU is a dedicated hardware control unit for liquid injection control. Adjusting the injection quantity means dynamically regulating the liquid supply per unit time based on the engine's operating status, specifically achieved by changing the liquid pump's drive frequency or the solenoid valve opening. This feature, through a closed-loop feedback mechanism, dynamically matches the liquid supply with combustion demand. During operation, engine speed, load signals, and injection pulse width parameters are transmitted to the FCU controller in real time to obtain the optimal injection quantity parameters for the current operating conditions.

[0028] A thawing and heating sleeve is installed on the spray pipe. This sleeve is connected to the signal output terminal of the controller and is used to heat the spray pipe. The thawing and heating sleeve is a heating device that wraps around the outside of the spray pipe; it can be implemented using resistance wire heating, which conducts heat to uniformly heat the pipe. When the ambient temperature is lower than a set threshold, the controller activates the thawing and heating sleeve based on the temperature sensor signal. This causes the resistance wire heating element to generate heat, which is then conducted to the spray pipe wall, melting the frozen medium inside the pipe.

[0029] The storage tank contains alcohol-based liquid media. In this embodiment, methanol is used as the liquid media. Methanol can participate in the reaction as an auxiliary fuel during combustion, thereby improving the overall combustion efficiency of the fuel and reducing nitrogen oxide emissions.

[0030] Multiple solenoid valves are installed on the injection pipe. The signal input terminals of the solenoid valves are connected to the signal output terminals of the controller, and the solenoid valves are used to control the opening and closing of the injection pipe. When the engine is under different operating conditions, the controller calculates the required injection volume for each nozzle based on real-time data collected from the engine speed, load, and nitrogen oxide sensors. The controller sends pulse width modulation signals to the corresponding solenoid valves, causing them to open and close at a set frequency. Each solenoid valve independently controls the liquid channel of one nozzle. When it is necessary to increase the injection volume in a specific area, the opening time of the solenoid valve in that area is increased; when it is necessary to reduce the injection volume, the opening time is decreased accordingly.

[0031] It also includes a thermometer, whose temperature sensing end is located inside the liquid storage tank. The thermometer is used to detect the temperature inside the tank. A thermometer is a device used to monitor the temperature changes of the liquid medium in the storage tank in real time. Specifically, it can be implemented using a thermocouple or a thermistor. The temperature sensing end is directly immersed in the liquid medium to obtain accurate temperature data. The thermometer forms a signal connection with the controller, and the temperature data is transmitted to the controller in real time for closed-loop control.

[0032] Specifically, the thermometer continuously collects the temperature information of the liquid medium in the storage tank and feeds the data back to the controller. When the temperature is detected to be lower than the preset lower limit, the controller activates the hot water valve of the defrosting U-tube, raising the temperature of the storage tank by circulating hot water. Through real-time temperature monitoring and dynamic adjustment, the liquid medium is ensured to always be within a suitable temperature range, avoiding freezing problems caused by abnormal temperatures.

[0033] It also includes a level gauge, whose level detection end is located inside the storage tank. The level gauge is used to detect the liquid level in the storage tank. Specifically, a float-type level sensor can be used to determine the remaining amount of liquid medium in the storage tank. In detail, the level detection end is arranged inside the storage tank, continuously collecting information on the liquid medium's surface position to generate corresponding level data. When the liquid level falls below a preset minimum threshold, the level gauge sends a low-level signal to the controller, triggering the liquid pump to stop for protection.

[0034] It also includes a hydraulic sensor. The hydraulic detection end of the hydraulic sensor is located inside the inlet pipe, and the signal output end of the hydraulic sensor is connected to the controller. The hydraulic sensor is used to acquire the pressure signal inside the inlet pipe and transmit it to the controller. The inlet pipe is the delivery pipeline connecting the liquid storage tank and the liquid pump, and its internal pressure directly affects the stability of the liquid supply of the liquid pump. Specifically, the hydraulic sensor continuously monitors the liquid pressure in the inlet pipe and transmits the real-time pressure signal to the controller. When abnormal pressure fluctuations are detected, the controller dynamically adjusts the speed of the liquid pump or the valve opening. For example, it increases the pump output power to compensate for flow loss when the pressure decreases, or reduces the pump output power to avoid pipeline overload when the pressure is too high.

[0035] It also includes a return pipe, one end of which is connected to the spray pipe, and the other end is connected to the storage tank. A pressure regulating valve is installed at the connection between the return pipe and the spray pipe. The return pipe is used to guide any unsprayed liquid back to the storage tank to prevent liquid stagnation and abnormal pipeline pressure.

[0036] The usage process of this utility model is as follows: Check the methanol liquid level in the storage tank and determine the remaining liquid status through the level gauge. If the liquid level is lower than the preset minimum threshold, methanol needs to be added in time; check the temperature of the methanol in the storage tank displayed on the thermometer to ensure that it is within the appropriate temperature range; if the ambient temperature is low and the detected temperature is lower than the preset lower limit, the controller activates the hot water valve of the defrosting U-tube, and the hot water from the engine water tank flows through the defrosting U-tube to the storage tank, raising the temperature of the storage tank and preventing methanol from freezing; check the pressure in the inlet pipe monitored by the hydraulic sensor to ensure that the pressure is normal, so as to ensure the stability of the liquid pump supply. Start the engine, and the engine starts running, and the exhaust gas it produces is output through the exhaust pipe. The engine's signal output terminal transmits the injection pulse width, speed, and load signals to the controller. The controller, as an independent hardware control unit specifically for liquid injection control, receives these signals from the engine and, based on these signals and the exhaust gas data collected by the nitrogen-oxygen sensor, determines the optimal injection quantity parameters required by each nozzle under the current operating conditions. The controller sends control commands to the liquid pump based on the calculated optimal injection parameters, and the liquid pump executes the commands upon receipt. The liquid pump draws methanol from the reservoir through the inlet pipe, pressurizes it, and delivers it to multiple nozzles through the injection pipe. Simultaneously, the controller sends pulse width modulation signals to multiple solenoid valves on the injection pipe, with each solenoid valve independently controlling the liquid channel of one nozzle. Depending on different operating conditions, when the injection volume in a specific area needs to be increased, the opening time of the solenoid valve in that area is increased; when the injection volume needs to be reduced, the opening time is correspondingly decreased, thus achieving precise control of the injection volume of each nozzle. Methanol is sprayed from multiple nozzles towards the engine's intake manifold. During combustion, methanol participates in the reaction as an auxiliary fuel, improving overall fuel combustion efficiency and reducing nitrogen oxide emissions. A level gauge continuously monitors the methanol level in the reservoir. When the level falls below a preset minimum threshold, it promptly sends a low-level signal to the controller, triggering the liquid pump shutdown protection. A hydraulic sensor continuously monitors the liquid pressure in the inlet pipe and transmits the real-time pressure signal to the controller. When abnormal pressure fluctuations are detected, the controller dynamically adjusts the speed of the liquid pump. A pressure-stabilizing valve installed at the connection between the return pipe and the injection pipe helps stabilize the pipeline pressure. Any uninjected methanol is returned to the storage tank via the return pipe to prevent liquid stagnation and subsequent abnormal pipeline pressure.

[0037] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid injection control device, comprising an engine having an intake manifold, the engine being connected to an exhaust pipe, and exhaust gas generated by the engine being output through the exhaust pipe, characterized in that, It also includes, The controller has its signal input terminal connected to the signal output terminal of the engine. The controller is used to receive the injection pulse width, speed and load signals from the engine, and generate control commands based on the injection pulse width, speed and load signals. A liquid storage tank, the interior of which has a containment space for containing a liquid medium; A liquid pump, wherein the inlet end of the liquid pump is connected to a storage tank through an inlet pipe, and the outlet end of the liquid pump is connected to multiple nozzles through a spray pipe, the spray ends of the multiple nozzles being arranged towards the air intake manifold, and the signal input end of the liquid pump is connected to the signal output end of the controller, and the liquid pump is used to receive control commands issued by the controller and execute actions according to the control commands; A nitrogen oxide sensor is provided, which is installed on the exhaust end of the exhaust pipe. The signal acquisition end of the nitrogen oxide sensor is located inside the exhaust pipe. The signal output end of the nitrogen oxide sensor is connected to the signal input end of the controller. The nitrogen oxide sensor is used to collect exhaust gas data output from the exhaust pipe and transmit the exhaust gas data to the controller. A thawing U-shaped tube, a portion of which is located inside the liquid storage tank, with its input and output ends connected to the engine water tank, respectively.

2. The spray control device according to claim 1, characterized in that, The controller is an FCU controller, which is used to adjust the injection volume of the liquid medium.

3. The spray control device according to claim 1, characterized in that, The spray pipe is equipped with a thawing and heating sleeve, which is connected to the signal output terminal of the controller. The thawing and heating sleeve is used to heat the spray pipe.

4. The spray control device according to claim 1, characterized in that, The storage tank contains alcohol-based liquid media.

5. The spray control device according to claim 1, characterized in that, Multiple solenoid valves are installed on the spray pipe. The signal input terminal of the solenoid valve is connected to the signal output terminal of the controller. The solenoid valve is used to realize the opening and closing of the spray pipe.

6. The spray control device according to claim 1, characterized in that, It also includes a thermometer, the temperature sensing end of which is located inside the liquid storage tank, and the thermometer is used to detect the temperature inside the liquid storage tank.

7. The spray control device according to claim 1, characterized in that, It also includes a level gauge, the level detection end of which is located inside the storage tank, and the level gauge is used to detect the level of liquid in the storage tank.

8. The spray control device according to claim 1, characterized in that, It also includes a hydraulic sensor, the hydraulic detection end of which is located inside the inlet pipe, and the signal output end of which is connected to the controller. The hydraulic sensor is used to acquire the pressure signal inside the inlet pipe and transmit it to the controller.

9. The spray control device according to claim 1, characterized in that, It also includes a return pipe, one end of which is connected to the spray pipe and the other end of which is connected to the storage tank. A pressure stabilizing valve is installed at the connection between the return pipe and the spray pipe.

10. The spray control device according to claim 1, characterized in that, A hot water valve is installed on the thawing U-shaped tube, which is used to control the on / off state of the thawing U-shaped tube.

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