阅读说明：本技术 一种柴油机排气背压试验控制全开降压的保护方法 (Protection method for controlling full opening and pressure reduction in exhaust backpressure test of diesel engine ) 是由 李丰 赵文圣 孟亮虎 杨迅 聂志斌 杨斌 王欢 于 2019-09-30 设计创作，主要内容包括：本发明属于柴油机技术领域,提出一种柴油机排气背压试验控制全开降压的保护方法。提出的柴油机排气背压试验控制全开降压的保护方法,为对应柴油机排气管路设置有柴油机排气背压主传感器和柴油机排气背压备传感器；柴油机排气背压主传感器和柴油机排气背压备传感器均与柴油机排气背压调节控制装置中的监控单元相连通构成自动控制监控单元；控制单元的输入输出控制模块与电动调节阀相连通,控制电动调节阀调节；柴油机排气背压调节控制装置中还设置有紧急全开控制按钮；紧急全开控制按钮分别与柴油机排气背压调节控制装置中的监控单元、电动调节阀相连通。本发明在故障状态或紧急情况下,柴油机排气背压能够有效的控制全开降压。(The invention belongs to the technical field of diesel engines, and provides a protection method for controlling full opening and pressure reduction in an exhaust back pressure test of a diesel engine. The protection method for controlling full opening and pressure reduction in the diesel engine exhaust back pressure test is characterized in that a diesel engine exhaust back pressure main sensor and a diesel engine exhaust back pressure standby sensor are arranged corresponding to a diesel engine exhaust pipeline; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are communicated with a monitoring unit in the adjusting and controlling device of the exhaust back pressure of the diesel engine to form an automatic control monitoring unit; the input and output control module of the control unit is communicated with the electric regulating valve to control the regulation of the electric regulating valve; the diesel engine exhaust back pressure adjusting control device is also provided with an emergency full-open control button; the emergency full-open control button is respectively communicated with a monitoring unit and an electric regulating valve in the diesel engine exhaust back pressure regulating and controlling device. The invention can effectively control the full opening and pressure reduction of the exhaust back pressure of the diesel engine under the fault state or emergency condition.)

1. A protection method for controlling full opening and pressure reduction in a diesel engine exhaust back pressure test is characterized by comprising the following steps: the protection method is that a main sensor of exhaust back pressure of the diesel engine and a backup sensor of exhaust back pressure of the diesel engine are arranged corresponding to the exhaust pipeline of the diesel engine; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are used for monitoring the exhaust back pressure in real time; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are communicated with a monitoring unit in the adjusting and controlling device of the exhaust back pressure of the diesel engine to form an automatic control monitoring unit; the input and output control module of the control unit is communicated with the electric regulating valve to control the regulation of the electric regulating valve; the diesel engine exhaust back pressure adjusting control device is also provided with an emergency full-open control button; the emergency full-open control button is respectively communicated with a monitoring unit and an electric regulating valve in the diesel engine exhaust back pressure regulating and controlling device; under emergency, press urgent full-open control button, urgent full-open control signal inputs respectively to monitoring unit and electrical control valve:

the emergency full-open control button is used for controlling the exhaust back pressure of the diesel engine through an automatic control unit or operating the emergency full-open control button under the condition of a fault state or an emergency, an effective control electric regulating valve is output to be fully opened, the exhaust back pressure drop of the diesel engine is realized, and the specific protection method comprises the following steps: when a monitoring unit of the exhaust back pressure adjusting and controlling device of the diesel engine is normally controlled and a valve needs to be processed in an emergency and is opened fully when a fault or an emergency occurs, two control methods are adopted for realizing:

1) an operator operates the emergency full-open button, the emergency full-open control feeding monitoring unit exits the current control and does not pass through the control of the monitoring unit, and the electric regulating valve is directly driven to control full-open pressure reduction;

after receiving an emergency full-open control signal, the monitoring unit automatically quits the current logic control and calls the emergency full-open logic, and outputs a 4-20mA signal through the input and output module to control the full opening of the electric regulating valve;

after the electric regulating valve receives a normally closed signal of an emergency full-open control button signal and changes the normally closed signal into a normally open signal, a 4-20mA analog signal output to the electric regulating valve by a monitoring unit is disconnected, and the electric regulating valve directly performs full-open action;

if any one of the two control signals fails, namely the signal is less than 4mA or more than 20 mA; or the circuit is broken, namely when the control signal is lost to be 0mA, the electric regulating valve automatically executes the full opening action;

2) the monitoring unit automatically judges and outputs the emergency full-open voltage reduction control, and when the control occurs:

monitoring the exhaust back pressure regulation of a main sensor of the exhaust back pressure of the diesel engine or a spare sensor of the exhaust back pressure of the diesel engine in an exhaust pipeline of the diesel engine, wherein the exhaust back pressure regulation is out of tolerance or exceeds a set protection pressure range;

monitoring the exhaust pipeline of the diesel engine, wherein the main sensor of the exhaust back pressure of the diesel engine or the spare sensor of the exhaust back pressure of the diesel engine are mutually standby and automatically switch the monitored pressure when the monitored pressure is wrong or lost;

and thirdly, when the monitoring unit breaks the line of the electric control valve drive control loop, namely the electric control valve does not receive continuous control signals.

2. The method for protecting the full open and pressure reduction of the exhaust backpressure test control of the diesel engine as claimed in claim 1, wherein: the signal range that electric control valve received does: 4-20mA analog signal; the 4-20mA corresponds to the opening and closing of the valve, namely 100-0%, and when the signal fails, namely the signal is smaller than 4mA or larger than 20mA, or the circuit is broken, namely the signal is 0mA, the electric regulating valve automatically executes full-opening action.

Technical Field

The invention belongs to the technical field of diesel engines, and particularly relates to a protection method for controlling full opening and pressure reduction in an exhaust back pressure test of a diesel engine.

Background

Diesel engines have been widely used as primary power devices for decades; with the development of science and technology and the requirement of novel power equipment, the special requirements for exhaust back pressure of the diesel engine are increased. Therefore, the exhaust backpressure of the diesel engine needs to be tested on a test bench, so that the product meets the requirement of the market on normal operation of the exhaust backpressure of the diesel engine under the working conditions of required pressure or fluctuation of the exhaust backpressure of the diesel engine, and the requirement of the exhaust backpressure of the diesel engine meets the requirement of normal operation of the diesel engine under the working conditions of periodic wave type pressure fluctuation in a certain pressure range within a certain time.

At present, in a diesel engine test bed, an electric control device arranged outside the test bed is used for controlling the regulation of an electric regulating valve, and the regulation of exhaust pressure is manually/automatically controlled by a control device. Similarly, the exhaust pressure reduction control also controls the electric regulating valve through the output of the electric control device.

When the diesel engine exhaust pressure reduction control is in a fault state or an emergency, the manual setting and control process has certain time delay, and even the electric regulating valve does not execute the pressure reduction condition when the control device is operated.

Disclosure of Invention

The invention aims to provide a protection method for controlling full-open depressurization in a diesel engine exhaust back pressure test, which can effectively control the full-open depressurization of the diesel engine exhaust back pressure in a fault state or an emergency condition during the diesel engine exhaust back pressure test.

The invention adopts the following technical scheme for achieving the purpose:

a protection method for controlling full opening and pressure reduction in a diesel engine exhaust back pressure test is characterized in that a diesel engine exhaust back pressure main sensor and a diesel engine exhaust back pressure standby sensor are arranged corresponding to a diesel engine exhaust pipeline; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are used for monitoring the exhaust back pressure in real time; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are communicated with a monitoring unit in the adjusting and controlling device of the exhaust back pressure of the diesel engine to form an automatic control monitoring unit; the input and output control module of the control unit is communicated with the electric regulating valve to control the regulation of the electric regulating valve; the diesel engine exhaust back pressure adjusting control device is also provided with an emergency full-open control button; the emergency full-open control button is respectively communicated with a monitoring unit and an electric regulating valve in the diesel engine exhaust back pressure regulating and controlling device; under emergency, press urgent full-open control button, urgent full-open control signal inputs respectively to monitoring unit and electrical control valve:

the emergency full-open control button is used for controlling the exhaust back pressure of the diesel engine through an automatic control unit or operating the emergency full-open control button under the condition of a fault state or an emergency, an effective control electric regulating valve is output to be fully opened, the exhaust back pressure drop of the diesel engine is realized, and the specific protection method comprises the following steps: when a monitoring unit of the exhaust back pressure adjusting and controlling device of the diesel engine is normally controlled and a valve needs to be processed in an emergency and is opened fully when a fault or an emergency occurs, two control methods are adopted for realizing:

1) an operator operates the emergency full-open button, the emergency full-open control feeding monitoring unit exits the current control and does not pass through the control of the monitoring unit, and the electric regulating valve is directly driven to control full-open pressure reduction;

after receiving an emergency full-open control signal, the monitoring unit automatically quits the current logic control and calls the emergency full-open logic, and outputs a 4-20mA signal through the input and output module to control the full opening of the electric regulating valve;

after the electric regulating valve receives a normally closed signal of an emergency full-open control button signal and changes the normally closed signal into a normally open signal, a 4-20mA analog signal output to the electric regulating valve by a monitoring unit is disconnected, and the electric regulating valve directly performs full-open action;

if any one of the two control signals fails, namely the signal is less than 4mA or more than 20 mA; or the circuit is broken, namely when the control signal is lost to be 0mA, the electric regulating valve automatically executes the full opening action;

2) the monitoring unit automatically judges and outputs the emergency full-open voltage reduction control, and when the control occurs:

monitoring the exhaust back pressure regulation of a main sensor of the exhaust back pressure of the diesel engine or a spare sensor of the exhaust back pressure of the diesel engine in an exhaust pipeline of the diesel engine, wherein the exhaust back pressure regulation is out of tolerance or exceeds a set protection pressure range;

monitoring the exhaust pipeline of the diesel engine, wherein the main sensor of the exhaust back pressure of the diesel engine or the spare sensor of the exhaust back pressure of the diesel engine are mutually standby and automatically switch the monitored pressure when the monitored pressure is wrong or lost;

and thirdly, when the monitoring unit breaks the line of the electric control valve drive control loop, namely the electric control valve does not receive continuous control signals.

The signal range that electric control valve received does: 4-20mA analog signal; the 4-20mA corresponds to the opening and closing of the valve, namely 100-0%, and when the signal fails, namely the signal is smaller than 4mA or larger than 20mA, or the circuit is broken, namely the signal is 0mA, the electric regulating valve automatically executes full-opening action.

According to the protection method for controlling full-open depressurization in the diesel engine exhaust back pressure test, the diesel engine exhaust back pressure can be effectively controlled to be full-open depressurization in the fault state or emergency condition in the diesel engine exhaust back pressure test bench test process by adopting the cooperation of the automatic control unit and the emergency full-open control button.

Drawings

FIG. 1 is a block diagram of the system of the present invention.

In the figure: 1. the exhaust back pressure adjusting and controlling device of the diesel engine; 2. A monitoring unit; 3. An emergency full open button; 4. The exhaust pipeline extends the transition pipe; 5. A sensor is arranged on the exhaust back of the diesel engine; 6. a main sensor for exhaust back pressure of the diesel engine; 7. the exhaust pipeline extends the transition pipe; 8. an electric control valve; 9. a diesel exhaust line; 10. and the system supplies power.

Detailed Description

The invention is described in connection with the accompanying drawings and the specific embodiments:

as shown in fig. 1, a protection method for controlling full opening and pressure reduction in a diesel engine exhaust back pressure test is that a main diesel engine exhaust back pressure sensor and a secondary diesel engine exhaust back pressure sensor are arranged corresponding to a diesel engine exhaust pipeline; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are used for monitoring the exhaust back pressure in real time; the main sensor of the exhaust back pressure of the diesel engine and the spare sensor of the exhaust back pressure of the diesel engine are communicated with a monitoring unit in the adjusting and controlling device of the exhaust back pressure of the diesel engine to form an automatic control unit; in the embodiment, the monitoring unit selects a PLC main CPU module LE5108 of the Harvest Corp; selecting a PLC expansion input and output module LE5330 of a Harvest corporation; the diesel engine exhaust back pressure adjusting control device is also provided with an emergency full-open control button; the emergency full-open control button is a common locking switch; urgent full-open control button be used for under fault condition or emergency, diesel engine exhaust backpressure can be through the control of automatic control unit or the urgent full-open control button of operation, the effectual control electrical control valve of output is opened entirely, realizes diesel engine exhaust backpressure drop, the signal range that electrical control valve received is: 4-20mA analog signal; the 4-20mA corresponds to the opening and closing of the valve, namely 100-0%, and when the signal fails, namely the signal is smaller than 4mA or larger than 20mA, or the line is broken, namely the signal is 0mA, the electric regulating valve automatically executes full opening action; the specific protection method comprises the following steps: when a monitoring unit of the exhaust back pressure adjusting and controlling device of the diesel engine is normally controlled and a valve needs to be processed in an emergency and is opened fully when a fault or an emergency occurs, two control methods are adopted for realizing:

when the monitoring unit 2 of the device 1 is normally controlled and a failure or emergency state occurs and the emergency treatment valve needs to be fully opened, two control methods are adopted for realizing:

1) an operator operates the emergency full-open button 3, the emergency full-open control feeding monitoring unit 2 exits the current control and does not pass through the control of the monitoring unit 2, and the electric regulating valve 8 is directly driven to control full-open pressure reduction;

after receiving an emergency full-open control signal, the monitoring unit automatically quits the current logic control and calls the emergency full-open logic, and outputs a 4-20mA signal through the input and output module to control the full opening of the electric regulating valve;

after the electric regulating valve receives a normally closed signal of an emergency full-open control button signal and changes the normally closed signal into a normally open signal, a 4-20mA analog signal output to the electric regulating valve by a monitoring unit is disconnected, and the electric regulating valve directly performs full-open action;

if any one of the two control signals fails, namely the signal is less than 4mA or more than 20 mA; or the circuit is broken, namely when the control signal is lost to be 0mA, the electric regulating valve automatically executes the full opening action;

2) the monitoring unit automatically judges and outputs the emergency full-open voltage reduction control, and when the control occurs:

one is that the monitoring unit 2 judges the urgent full open step-down control of output automatically, when appearing:

1) monitoring the exhaust back pressure regulation of a main exhaust back pressure sensor 6 or a spare exhaust back pressure sensor 5 of the diesel engine in an exhaust pipeline 9 of the diesel engine, wherein the exhaust back pressure regulation is out of tolerance or exceeds a set protection pressure range;

2) in the monitoring diesel engine exhaust pipeline 9, when the main diesel engine exhaust back pressure sensor 6 or the spare diesel engine exhaust back pressure sensor 5 are mutually spare and the pressure automatically switched and monitored is wrong or lost;

3) when the monitoring unit 2 to the electric regulating valve 8 drive control loop is disconnected.