Gas engine single-cylinder temperature control device based on PWM control and generator set

Abstract

The invention relates to the technical field of gas engine control, in particular to a gas engine single-cylinder temperature control device based on PWM control. The temperature sensor is used for collecting the temperature of a single cylinder and is connected with the controller; the opening degree feedback module is used for collecting the opening degree of the single-cylinder valve and is connected with the controller; and the opening control module is used for controlling the opening of the single-cylinder valve and is connected with the controller. The opening degree control module adopts a 485 signal line to output a control signal, and the opening degree of the electric control valve is controlled through the two PWM conversion modules. By independently controlling the opening degree of an air inlet valve of the air cylinder, the single-cylinder temperature of the gas engine is better controlled, and it is ensured that the temperature in the cylinder does not exceed the highest limit under any power; air and fuel gas enter the air cylinder respectively, so that the fuel gas and the air are isolated outside the air cylinder and mixed in the air cylinder, and gas combustion and even explosion in the air inlet pipe caused by backfire are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of gas engine control, and in particular to a gas engine single-cylinder temperature control device and a generator set based on PWM control. Background Art

[0002] The present invention relates to the technical field of gas engine control, and in particular to a gas engine single-cylinder temperature control device and a generator set based on PWM control. Summary of the Invention

[0003] The main purpose of the present invention is to provide a gas engine single-cylinder temperature control device and application based on PWM control, which can independently control the opening of the intake valve of the cylinder and better control the temperature of the gas engine single cylinder.

[0004] A first aspect of the present invention provides a gas engine single-cylinder temperature control device based on PWM control, comprising a plurality of cylinders, each cylinder having a single-cylinder valve for air intake, characterized in that it comprises: Controller; A temperature sensor for collecting the temperature of a single cylinder and connected to the controller; An opening feedback module for collecting the opening of the single-cylinder valve and connected to the controller; An opening control module controls the opening of the single-cylinder valve and is connected to the controller.

[0005] As a further improvement, the controller includes a cylinder temperature acquisition module, and the cylinder temperature acquisition module is connected to the temperature sensor.

[0006] As a further improvement, the controller is further connected to a touch screen, and the touch screen is used to set the opening and temperature alarm value of the electric butterfly valve.

[0007] As a further improvement, the controller is also connected to a remote control cabinet or a central monitoring unit.

[0008] As a further improvement, the opening feedback module adopts a 6-way opening feedback module to collect the opening signal of the single-cylinder valve; the opening control module adopts a 6-way opening control module to send the single-cylinder valve opening control signal.

[0009] As a further improvement, the opening control module uses a 485 signal line to output a control signal, which passes through two PWM conversion modules to control the opening of the electronically controlled valve.

[0010] The controller collects the analog signal of the cylinder temperature sensor of a single cylinder installed on the engine. After processing by the CPU, it outputs a control signal through the 485 signal line. After passing through two PWM conversion modules, it controls the opening of a single electronically controlled valve, and then controls the size of the gas intake to achieve single-cylinder temperature control. At the same time, the actual opening of each electronically controlled valve is also transmitted to the controller through the 485 signal line. After processing, the opening value is displayed in real time on the touch screen.

[0011] As a further improvement, the opening control module controls the temperature signal collected by the cylinder temperature collection module and the opening signal of the single-cylinder valve, calculates the set opening of the single-cylinder valve, and converts it into a single-cylinder valve opening control signal.

[0012] Optionally, the controller converts the manually set opening parameters received by the touch screen into a single-cylinder valve opening control signal.

[0013] As a further improvement, the temperature sensor is arranged on a single-cylinder cylinder head of the engine, and the single-cylinder valve controls the gas intake pipe of the engine.

[0014] A second aspect of the present invention provides a gas-fired generator set utilizing industrial tail gas as fuel, and the above-mentioned gas engine single-cylinder temperature control device.

[0015] The application of the technical solution of the present invention has the following technical effects: (1) By individually controlling the opening of the intake valve of each cylinder, the temperature of each cylinder of the gas engine can be better controlled to ensure that the temperature in the cylinder does not exceed the maximum limit at any power.

[0016] (2) By allowing air and gas to enter the cylinder separately, the gas and air are isolated outside the cylinder and mixed inside the cylinder, thus preventing the gas in the intake pipe from burning or even exploding due to backfire.

[0017] (3) Since the gas generator set uses an engine single-cylinder temperature control device, when the temperature of a cylinder is too high due to fluctuations in engineering parameters or equipment itself, the temperature of the cylinder can be adjusted separately, reducing the impact on the overall power of the generator set and improving the stability of equipment operation.

[0018] (4) In addition to the controller automatically controlling the opening of the single-cylinder valve, it can also be switched to manual control mode. After the control panel is switched to manual mode, the opening of the single-cylinder valve of each cylinder can be input to improve the controllability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1The figure shows the overall schematic diagram of the gas engine single-cylinder temperature control device based on PWM control provided by the present invention; Figure 2 The figure shows a specific connection diagram of the gas engine single-cylinder temperature control device based on PWM control provided by the present invention. DETAILED DESCRIPTION

[0020] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Example

[0021] Embodiment 1 of the present invention provides a gas engine single cylinder temperature control device based on PWM control. The overall connection relationship of each module of the device is as follows: Figure 1 As shown in the figure, the ECU (PLC) performs overall control. Its thermoelectric signal input module collects and receives 12 cylinder temperature signals from the gas engine. These signals are provided by cylinder temperature sensors. These signals are processed by the ECU's CPU and then controlled by the PWM single-cylinder valve control module, which controls the opening of 12 electronically controlled valves. This, in turn, controls the gas intake volume and achieves single-cylinder temperature control. Simultaneously, the actual opening of each cylinder's electronically controlled valve is transmitted to the ECU via the single-cylinder valve position signal module. After processing, the opening value is displayed in real time on the touchscreen.

[0022] like Figure 1 The figure further illustrates the structural connections of this device and demonstrates the control of a single-cylinder valve. The cylinder temperature acquisition module (i.e., thermoelectric signal input module) in the ECU (PLC) collects the cylinder temperature on the cylinder head. The ECU receives the opening position feedback signal of the single-cylinder control valve through the 6-way opening feedback module. The ECU processes the cylinder temperature signal and outputs the single-cylinder opening control signal to the single-cylinder control valve through the 6-way opening control module. The single-cylinder control valve controls the opening of the gas intake pipe, thereby controlling the gas intake volume and achieving single-cylinder temperature control.

[0023] In this embodiment, the ECU collects analog signals from 12 engine-mounted cylinder temperature sensors. After processing by the CPU, these signals are output via a 485 signal line. These signals, passed through two PWM conversion modules, control the opening of 12 electronically controlled valves, thereby controlling the amount of gas intake and achieving single-cylinder temperature control. Simultaneously, the actual opening of each electronically controlled valve is transmitted to the PLC via a 485 signal line. After processing, the opening value is displayed in real time on the touch screen. Through a single 485 communication line, the duty cycle of the square wave is programmatically adjusted to achieve PWM control of the input voltage to the 12 electronically controlled valves. The valve opening is proportional to the duty cycle. Electric butterfly valves control the temperature of individual cylinders, and the opening and temperature alarm values ​​of each electronically controlled valve can be set via the touch screen.

[0024] The use of single-cylinder control of cylinder temperature ensures that the temperature in the cylinder does not exceed the maximum limit at any power, so that the gas and air are isolated outside the cylinder and mixed inside the cylinder, preventing gas combustion or even explosion in the intake pipe caused by backfire.

[0025] In addition to the automatic control of the opening of the single-cylinder valve by the ECU controller as mentioned above, it can also be switched to manual control mode. After the touch screen is switched to manual mode, the opening of the single-cylinder valve of each cylinder can be input on the touch screen to improve the controllability of the device. Example

[0026] The second embodiment of the present invention provides an engine and a generator set to which the gas engine single-cylinder temperature control device based on PWM control in the first embodiment is applied.

[0027] Existing in-cylinder temperature control schemes for gas-fired generator sets do not implement per-cylinder control. Instead, they monitor the temperatures of all 12 cylinders. If the temperature of a cylinder is too high, the overall intake valve opening is reduced, reducing the intake volume of each cylinder and thus lowering the cylinder temperature. However, this also reduces overall engine power, and when the in-cylinder gas burns poorly, backfire is inevitable.

[0028] The single-cylinder temperature control scheme of this embodiment 1 ensures that the cylinder temperature does not exceed the maximum limit at any power level. This ensures that the gas and air are isolated outside the cylinder and mixed inside, thus preventing combustion or even explosion of the gas in the intake pipe caused by backfire. Thus, for a gas-fired generator set, if the temperature of a particular cylinder is too high due to fluctuations in engineering parameters or equipment problems, the temperature of that cylinder can be adjusted individually, reducing the impact on the overall power of the generator set and improving the stability of the equipment operation.

[0029] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gas engine single-cylinder temperature control device based on PWM control, having several cylinders, each cylinder having a single-cylinder valve for air intake, characterized in that: include: Controller; A temperature sensor for collecting the temperature of a single cylinder and connected to the controller; an opening feedback module for collecting the opening of the single cylinder valve and connected to the controller; an opening control module for controlling the opening of the single cylinder valve and connected to the controller.

2. The gas engine single cylinder temperature control device based on PWM control according to claim 1, characterized in that: The controller includes a cylinder temperature acquisition module, and the cylinder temperature acquisition module is connected to the temperature sensor.

3. The gas engine single cylinder temperature control device based on PWM control according to claim 1, characterized in that: The controller is also connected to a touch screen, and the touch screen is used to display the single cylinder valve opening and temperature alarm value.

4. The gas engine single cylinder temperature control device based on PWM control according to claim 1, characterized in that: The controller is also connected to a remote control cabinet or a central monitoring unit.

5. The gas engine single cylinder temperature control device based on PWM control according to claim 1, characterized in that: The opening feedback module uses a 6-way opening feedback module to collect the opening signal of the single-cylinder valve; the opening control module uses a 6-way opening control module to send the single-cylinder valve opening control signal.

6. The gas engine single cylinder temperature control device based on PWM control according to claim 5, characterized in that: The opening control module uses a 485 signal line to output a control signal, which controls the opening of the electronically controlled valve through two PWM conversion modules.

7. The gas engine single cylinder temperature control device based on PWM control according to claim 6, characterized in that: The controller converts the temperature signal collected by the cylinder temperature collection module and the opening signal of the single-cylinder valve into a single-cylinder valve opening control signal by calculating the set opening of the single-cylinder valve.

8. The gas engine single cylinder temperature control device based on PWM control according to claim 6, characterized in that: The controller converts the manually set opening parameters received by the touch screen into single-cylinder valve opening control signals.

9. The gas engine single-cylinder temperature control device based on PWM control according to claim 2, wherein the temperature sensor is arranged on a cylinder head of a single cylinder of the engine, and the single-cylinder valve controls the gas intake pipe of the engine.

10. A gas-fired generator set using industrial tail gas as fuel, characterized in that: It comprises the gas engine single-cylinder temperature control device as described in any one of claims 1 to 9.

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