General gasoline engine ECU structure capable of detecting gas pressure

Abstract

The utility model discloses a general gasoline engine ECU structure capable of detecting gas pressure. The general gasoline engine ECU structure comprises a valve body, an ECU assembly, a fuel injector, a fuel gas inlet pipe and a fuel gas electromagnetic valve. The ECU assembly is installed on the top of the valve body. An oil spraying nozzle of the oil sprayer is positioned in the valve body air inlet channel; the fuel gas inlet pipe is connected to a fuel gas inlet of the valve body and communicates with the valve body gas inlet channel through a fuel gas channel in the valve body. The fuel gas electromagnetic valve is used for controlling the on-off of the fuel gas channel; the ECU assembly is provided with an absolute pressure sensor used for collecting the atmospheric pressure of the environment where the general gasoline engine is located and a relative pressure sensor used for collecting the gas inlet pressure. According to the utility model, the atmospheric pressure of the area where the whole general gasoline engine is located can be monitored in real time through an absolute pressure sensor chip in the ECU; and meanwhile, the actual pressure of the gas fuel can be collected through an internal relative pressure sensor chip.

Description

Technical Field

[0001] The utility model relates to the field of general-purpose engine ECUs, and in particular to a general-purpose engine ECU structure capable of detecting gas pressure. Background Art

[0002] A general gasoline engine ECU (Electronic Control Unit) is an electronic device used to control the operation of a general gasoline engine. Its structure mainly includes the following parts: Input circuit: Receives various signals from sensors, such as speed, temperature, pressure, etc., and converts these signals into digital signals and inputs them into the ECU. Microprocessor: It is the core component of the ECU, responsible for processing and calculating the input digital signals, and generating corresponding control signals to output to the actuator based on the preset control algorithms and parameters. Memory: Used to store information such as control algorithms, parameters and fault codes. Output circuit: Converts the control signals generated by the microprocessor into analog signals or digital signals, and outputs them to actuators, such as injectors, ignition coils, etc., to control the operation of the gasoline engine. Communication interface: Used to communicate with external devices, such as diagnostic tools, on-board computers, etc., for fault diagnosis and parameter adjustment.

[0003] As altitude increases, atmospheric pressure and oxygen concentration decrease accordingly. The ECU needs to determine the current altitude and adjust the fuel injection quantity to accommodate the thinner air. When ambient air pressure is low, such as at high altitudes, the air density decreases. Based on the low air pressure signal, the ECU adjusts the injection pulse width and reduces the injection quantity. This is because the actual oxygen content of the same volume of intake air decreases. If fuel is injected at the same quantity as in plains, the fuel-air mixture will be too rich, resulting in incomplete combustion, reduced power, increased fuel consumption, and even the formation of large amounts of carbon deposits.

[0004] To meet diverse fuel requirements, when using gaseous fuels such as natural gas or liquefied petroleum gas (LPG), it's necessary not only to determine altitude but also to monitor the actual fuel pressure to adjust the intake air volume. Gas intake pressure is a key factor influencing fuel supply. The ECU collects intake pressure and combines it with information from other sensors (such as the engine speed sensor and throttle position sensor) to accurately calculate the amount of fuel required by the engine under different operating conditions. For example, when the engine is idling, the required amount of fuel is relatively low. Based on the low intake pressure signal, the ECU controls the gas injection device, reducing the amount of fuel injected to ensure a smooth engine idle. However, when the engine is operating under high load, such as when climbing a hill or accelerating, the intake pressure increases accordingly. The ECU responds to this pressure change by increasing the gas supply to meet the engine's power output. Utility Model Content

[0005] In view of this, the purpose of this utility model is to develop a general-purpose engine ECU structure that can detect gas pressure. The atmospheric pressure of the entire general-purpose engine area can be monitored in real time through the absolute pressure sensor chip inside the ECU, and the actual pressure of the gas fuel can be collected through the internal relative pressure sensor chip.

[0006] The utility model discloses a gas pressure-detecting ECU structure for a general-purpose machine, comprising a valve body, an ECU assembly, an injector, a gas intake pipe, and a gas solenoid valve; the ECU assembly is mounted on the top of the valve body; the injector nozzle is located in the intake passage of the valve body; the gas intake pipe is connected to the gas inlet of the valve body and communicates with the intake passage of the valve body through a gas passage in the valve body; the gas solenoid valve is used to control the on-off of the gas passage; the ECU assembly is provided with an absolute pressure sensor for collecting the atmospheric pressure of the environment in which the general-purpose machine is located, and a relative pressure sensor for collecting the gas intake pressure.

[0007] Furthermore, an intake duct connecting channel is provided inside the valve body, one end of the intake duct connecting channel is located at the top surface of the valve body, and the other end is connected to the inside of the intake duct. The absolute pressure sensor detects the air pressure inside the intake duct through the intake duct connecting channel.

[0008] Furthermore, a gas pipeline connecting channel is provided inside the valve body, one end of the gas pipeline connecting channel is located at the top surface of the valve body, and the other end is connected to the gas channel. The detection end of the relative pressure sensor extends into the gas pipeline connecting channel to detect the internal air pressure of the gas pipeline.

[0009] Furthermore, the bottom end of the ECU component housing and the top end of the valve body are both provided with grooves, which cooperate with each other to form a cavity connected to the intake duct connecting channel; the absolute pressure sensor is installed in the cavity.

[0010] Beneficial effects of the present invention: The present invention proposes a general-purpose ECU structure capable of detecting gas pressure, which can monitor the atmospheric pressure of the entire general-purpose area in real time through the absolute pressure sensor chip inside the ECU, and at the same time can collect the actual pressure of the gas fuel (generally small, only a few kPa greater than the atmosphere) through the internal relative pressure sensor chip. When the general-purpose unit is in standby mode or during the non-inhalation stroke of each working process, the absolute pressure sensor collects atmospheric pressure, and the specific altitude can be calculated to adjust the throttle opening and the injection pulse width to control the injection amount; when using gas in the same working process, the relative pressure sensor collects the pressure in the intake pipe to calculate the flow rate of the gas, thereby adjusting the throttle opening and the gas relay conduction duty cycle to control the intake amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a cross-sectional view of the utility model Figure I ;

[0014] Figure 3 This is a cross-sectional view of the utility model Figure II ;

[0015] Figure 4 This is a structural diagram of the valve body of the present utility model. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, a general ECU structure capable of detecting gas pressure in this embodiment includes a valve body 5, an ECU component 2, an injector 3, a gas intake pipe and a gas solenoid valve 4.

[0017] The fuel injection nozzle of the fuel injector 3 is located in the air inlet of the valve body 5; the fuel injector 3 sprays the fuel into the air inlet in the form of a mist, and the mixed gas eventually enters the combustion chamber for combustion.

[0018] The gas inlet pipe 54 is connected to the gas inlet of the valve body 5 and communicates with the inlet of the valve body 5 through the gas channel 55 in the valve body 5; the gas solenoid valve 4 is used to control the on and off of the gas channel 55; when the machine uses oil as fuel, the gas solenoid valve 4 is closed, and when gas is used as fuel, the gas solenoid valve 4 is opened. At the same time, the gas intake amount can be controlled by controlling the opening of the gas solenoid valve 4.

[0019] The ECU assembly 2 is installed on the top of the valve body 5, and the top of the ECU assembly 2 is closed by the cover body 1; the ECU assembly 2 is provided with an absolute pressure sensor 21 for collecting the atmospheric pressure of the environment in which the machine is located and a relative pressure sensor 23 for collecting the gas intake pressure.

[0020] like Figure 2As shown, the valve body 5 is provided with an intake duct connection channel. One end of the intake duct connection channel is located at the top surface of the valve body 5, and the other end is connected to the interior of the intake duct of the valve body 5. The absolute pressure sensor 21 detects the air pressure inside the intake duct through the intake duct connection channel. The intake duct of the valve body 5 is connected to the intake pipe of the engine, and the intake pipe is connected to the outside atmosphere. Therefore, by detecting the air pressure in the intake duct of the valve body 5, the atmospheric pressure of the engine environment can be monitored. The specific altitude can be calculated to adjust the throttle opening and injection pulse width to control the injection amount. The bottom end of the ECU component 2 housing and the top end of the valve body 5 are both provided with grooves (22, 51). The grooves cooperate to form a cavity connected to the intake duct connection channel; the absolute pressure sensor 21 is installed in this cavity. Because the cavity is connected to the intake duct through the intake duct connection channel, the detection end of the absolute pressure sensor 21 is located in the cavity. The cavity is well sealed, which can ensure that the absolute pressure sensor 21 has a good working environment.

[0021] like Figure 3 As shown, the valve body 5 is internally provided with a gas pipeline connection channel 53. One end of the gas pipeline connection channel 53 is located at the top surface of the valve body 5, and the other end is connected to the gas channel 55. The detection end of the relative pressure sensor 23 extends into the gas pipeline connection channel 53 to detect the internal gas pipeline pressure. The relative pressure sensor 23 collects the pressure in the intake pipeline to calculate the gas flow rate, thereby adjusting the throttle opening and the gas relay conduction duty cycle to control the intake air volume.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A general-purpose ECU structure capable of detecting gas pressure, characterized in that: It includes a valve body, an ECU assembly, an injector, a gas intake pipe and a gas solenoid valve; the ECU assembly is installed on the top of the valve body; the injector nozzle is located in the valve body intake duct; the gas intake pipe is connected to the gas inlet of the valve body and communicates with the valve body intake duct through the gas channel in the valve body; the gas solenoid valve is used to control the on and off of the gas channel; the ECU assembly is provided with an absolute pressure sensor for collecting the atmospheric pressure of the environment in which the machine is located and a relative pressure sensor for collecting the gas intake pressure.

2. The general ECU structure capable of detecting gas pressure according to claim 1, characterized in that: An intake duct connecting channel is provided inside the valve body, one end of the intake duct connecting channel is located on the top surface of the valve body, and the other end is connected to the inside of the intake duct. The absolute pressure sensor detects the air pressure inside the intake duct through the intake duct connecting channel.

3. The general ECU structure capable of detecting gas pressure according to claim 1, characterized in that: A gas pipeline connecting channel is provided inside the valve body, one end of the gas pipeline connecting channel is located at the top surface of the valve body, and the other end is connected to the gas channel. The detection end of the relative pressure sensor extends into the gas pipeline connecting channel to detect the gas pressure inside the gas pipeline.

4. The general ECU structure capable of detecting gas pressure according to claim 3, characterized in that: The bottom end of the ECU component housing and the top end of the valve body are both provided with grooves, which cooperate with each other to form a cavity connected to the intake duct connecting channel; the absolute pressure sensor is installed in the cavity.

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