Engine power system and control method thereof

Abstract

The invention belongs to the technical field of engines, and particularly relates to an engine power system and a control method thereof. The two ends of the main pipeline communicate with the gas outlet end and the gas inlet end of the engine correspondingly, and waste gas output by the engine flows in the main pipeline; the cooler is installed on the main pipeline and used for reducing the temperature of the exhaust gas flowing back to the engine; the concentration detection part is mounted on the main pipeline and is used for detecting the concentration of corrosive substances in the waste gas; the control module is in communication connection with the concentration detection part and is configured to obtain a concentration detection signal sent by the concentration detection part; and controlling the on-off of a branch pipe section between the air outlet end of the engine and the air inlet end of the cooler according to the concentration detection signal. By the adoption of the engine power system, corrosion of corrosive substances to the cooler can be reduced, and the service life of the engine and the cooler in the engine power system is prolonged.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and specifically relates to an engine power system and a control method thereof. Background Art

[0002] The engine is usually equipped with a combustion chamber, where the combustion of mixed gas can drive the engine piston rod to move, thereby driving other parts to move. However, if the temperature in the combustion chamber is too high, it will not only affect the life of the engine, but also generate nitrogen oxides, which will pollute the atmosphere. Therefore, the maximum temperature in the combustion chamber of a diesel engine must be limited.

[0003] In the prior art, in order to reduce the temperature of the combustion chamber, an exhaust gas circulation device is provided. The exhaust gas circulation device can cool part of the exhaust gas generated by the engine and retransmit it to the intake end of the engine. The exhaust gas contains high concentrations of carbon dioxide and other gases with high specific heat capacity. Transmitting them from the intake end to the combustion chamber can reduce the maximum temperature in the combustion chamber.

[0004] The cooler in the exhaust gas circulation device is often corroded by the high concentration of corrosive substances (such as sulfur dioxide) in the exhaust gas, resulting in a shorter life of the cooler. Damage to the cooler will not only lead to increased air pollution, but also cause engine overheating and reduce the service life of the engine. Summary of the invention

[0005] The purpose of the present application is to provide an engine power system and a control method thereof, so as to reduce the erosion of a cooler by corrosive substances and extend the service life of an engine and a cooler in the engine power system.

[0006] In order to achieve the above-mentioned object, the present application provides an engine power system on one hand, and the engine power system includes:

[0007] engine;

[0008] A main pipe, the two ends of which are respectively connected to the exhaust end and the intake end of the engine, and the exhaust gas output by the engine flows in the main pipe;

[0009] A cooler, which is installed on the main pipe and is used to reduce the temperature of the exhaust gas;

[0010] The concentration detection component is installed on the main pipe and is used to detect the concentration of corrosive substances in the exhaust gas;

[0011] The control module is connected to the concentration detection component for communication and is configured to: obtain a concentration detection signal sent by the concentration detection component; and control the on-off of a branch pipe section between an air outlet of the engine and an air inlet of the cooler according to the concentration detection signal.

[0012] In some embodiments, the main pipeline further includes an exhaust pipe section connecting the exhaust end of the engine with the outside atmosphere, and the concentration detection element is installed on the exhaust pipe section.

[0013] In some embodiments, the engine power system further includes an on-off valve installed on the branch pipe section, the on-off valve is communicatively connected to the control module and is used to switch the branch pipe section on and off according to an on-off control instruction issued by the control module.

[0014] In some embodiments, the concentration detection component is installed on the branch pipe section between the engine outlet and the on-off valve.

[0015] In some embodiments, the concentration detection element is a sulfide concentration detection element, and the sulfide concentration detection element is used to detect the sulfide concentration in the exhaust gas.

[0016] In some embodiments, the cooler includes a cooling pipeline, in which coolant flows, and the engine power system also includes a pressure difference detection device, which is communicatively connected to the control module, and the pressure difference detection device is used to detect the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline; the control module is also configured to: obtain a pressure difference detection signal emitted by the pressure difference detection device; and control the opening and closing of the branch pipe section according to the pressure difference detection signal.

[0017] The second aspect of the present invention provides a control method for an engine power system, which is applied to the above-mentioned engine power system, and the engine power system includes: an engine; a main pipeline, the two ends of which are respectively connected to the exhaust end and the intake end of the engine, and the exhaust gas output by the engine flows in the main pipeline; a cooler, which is installed on the main pipeline and is used to reduce the temperature of the exhaust gas; a concentration detection component, which is installed on the main pipeline, and the concentration detection component is used to detect the concentration of corrosive substances in the exhaust gas; a control module, which is communicatively connected with the concentration detection component; the control method includes the following steps: obtaining a concentration detection signal sent by the concentration detection component; determining the concentration of the corrosive substance according to the concentration detection signal; and cutting off the branch pipe section when the concentration of the corrosive substance is greater than a preset concentration threshold.

[0018] In some embodiments, the cooler includes a cooling pipeline, in which coolant flows, and the engine power system also includes a pressure difference detection device, which is communicatively connected to the control module, and the pressure difference detection device is used to detect the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline; the control method also includes: obtaining a pressure difference detection signal emitted by the pressure difference detection device; determining the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline according to the pressure difference detection signal; and when the pressure difference is greater than a preset pressure difference threshold, cutting off the branch pipe section.

[0019] In some embodiments, the main line also includes an exhaust pipe section that connects the exhaust end of the engine to the outside atmosphere, and the concentration detection component is installed on the exhaust pipe section. The control method also includes: after the branch pipe section is cut off, limiting the output power of the engine; obtaining a pressure difference detection signal and a concentration detection signal in real time; when the concentration of the corrosive substance is less than or equal to a preset concentration threshold and the pressure difference is less than or equal to a preset pressure difference threshold, turning on the branch pipe section and stopping limiting the output power of the engine.

[0020] In some embodiments, the engine power system further includes a warning component, and the control method further includes: when the branch pipe section is cut off, controlling the warning component to issue a warning prompt.

[0021] In the above technical scheme, the engine power system includes an engine, a main line, a cooler, a concentration detection part and a control module. The two ends of the main line are respectively connected to the outlet and the inlet of the engine. During the operation, the engine can absorb fresh gas and exhaust gas from the main line and discharge the exhaust gas into the main line, that is, the exhaust gas can circulate in the main line. The cooler can reduce the temperature of the exhaust gas, so that the exhaust gas enters the engine at a lower temperature, so as to cool the combustion chamber of the engine and reduce the generation of nitrides. The concentration detection part is installed on the main line, and can detect the concentration of corrosive substances in the exhaust gas in the main line. When the concentration of corrosive substances in the main line is too high, it can corrode the cooler and affect the service life of the cooler. The control module is connected to the concentration detection part in communication. The control module can receive the concentration detection signal sent by the concentration detection part, and control the opening and closing of the branch pipe section between the outlet of the engine and the inlet of the cooler according to the concentration detection signal, so as to prevent the high concentration of corrosive substances in the exhaust gas from corroding the cooler, so as to extend the service life of the cooler and the engine.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0024] Figure 1 A schematic diagram of an engine power system according to an embodiment of the present invention;

[0025] Figure 2 The present invention is a flowchart of a method for controlling an engine power system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0027] The engine power system and control method thereof according to the present application are described below with reference to the accompanying drawings. Figure 1 FIG. 1 is a schematic diagram of an engine power system according to an embodiment of the present invention. The engine power system includes:

[0028] engine;

[0029] A main pipe, the two ends of which are respectively connected to the exhaust end and the intake end of the engine, and the exhaust gas output by the engine flows in the main pipe;

[0030] A cooler, which is installed on the main pipe and is used to reduce the temperature of the exhaust gas;

[0031] The concentration detection component is installed on the main pipe and is used to detect the concentration of corrosive substances in the exhaust gas;

[0032] The control module is connected to the concentration detection component for communication and is configured to: obtain a concentration detection signal sent by the concentration detection component; and control the on-off of a branch pipe section between an air outlet of the engine and an air inlet of the cooler according to the concentration detection signal.

[0033] An engine is a power device that ignites a mixed gas to drive the cylinder to reciprocate. During the operation of the engine, it needs to continuously absorb external gas to ensure that the engine spark plug can ignite the fuel in the combustion chamber. However, when the combustion chamber temperature of the engine is too high, nitrides will be produced, causing great pollution to the environment. In the prior art, in order to reduce the temperature of the combustion chamber, the exhaust gas is usually cooled and then retransmitted to the combustion chamber of the engine to cool the combustion chamber through the larger specific heat capacity gas in the exhaust gas. However, the exhaust gas often contains corrosive substances, which can corrode the cooler and reduce the service life of the cooler.

[0034] The engine power system provided by the embodiment of the present invention includes an engine, a main line, a cooler, a concentration detection element and a control module. The main line can retransmit part of the exhaust gas output by the engine to the combustion chamber of the engine. The cooler can cool the exhaust gas flowing in the main line, and the concentration detection element is installed on the main line, which can detect the concentration of corrosive substances in the exhaust gas. Among them, the cooler can be an RGR cooler, and the EGR cooler is an important component in the engine power system. Generally, water cooling or air cooling is used to reduce the temperature of the exhaust gas. The cooled exhaust gas is sent back to the engine by the exhaust gas intake pipe. The exhaust gas with a higher specific heat capacity is mixed with fresh air and burned again, which can significantly reduce the temperature in the engine combustion chamber and inhibit the generation of nitrogen compounds. The control module can obtain the concentration detection signal sent by the concentration detection element. When the control module determines that the concentration of corrosive substances in the exhaust gas is high, the branch pipe section can be cut off. When the control module determines that the concentration of corrosive substances in the exhaust gas is low, the exhaust gas can enter the cooler normally.

[0035] In a specific embodiment, the control module can determine the concentration of corrosive substances in the air pipe based on the concentration detection signal, and compare it with a preset concentration threshold. When the concentration of the corrosive substances is greater than the preset concentration threshold, the control module controls the branch pipe section between the engine outlet and the cooler inlet to be cut off.

[0036] The engine control system described above can prevent high-concentration corrosive substances from corroding the cooler, thereby extending the service life of the cooler and the engine.

[0037] In one embodiment, Figure 1 As shown, the main line also includes an exhaust pipe section that connects the engine's air outlet to the outside atmosphere. The concentration detection component is installed on the exhaust pipe section, and the exhaust pipe section discharges another part of the exhaust gas into the atmosphere to make the air flow smoother. In addition, a turbocharger is connected to the exhaust pipe section. The air pressure in the exhaust pipe section is relatively high, which can provide power for the turbocharger. The concentration detection component is installed on the exhaust pipe section, and can immediately feedback to the control module after the corrosive substance exceeds the standard, thereby improving the response speed of the control module. And when the concentration of the corrosive substance is lower than the preset concentration threshold, the control module can open the branch pipe section to recycle the exhaust gas.

[0038] In one embodiment, Figure 1As shown, the engine power system also includes an on-off valve installed on the branch pipe section. The on-off valve is connected to the control module for communication and is used to switch the branch pipe section on and off according to the on-off control command issued by the control module. The working states of the on-off valve include an open state and a closed state. When the on-off valve is in an open state, the exhaust gas can enter the cooler through the branch pipe section; when the on-off valve is in a closed state, the exhaust gas is cut off in the branch pipe section, and the exhaust gas containing corrosive substances cannot be transmitted to the cooler to protect the cooler and the engine. With the above-mentioned engine power system, the on-off valve can be used to control the on-off of the branch pipe section, and the structure is simple and the control is convenient.

[0039] In one embodiment, Figure 1 As shown, the concentration detection component is installed on the branch pipe section between the engine outlet and the on-off valve. Installing it at this position can more accurately detect the exhaust gas flowing into the cooler, and after the on-off valve is closed, the corrosive substance content in the exhaust gas is continuously detected and a concentration detection signal is sent to the control module. After the concentration of the corrosive substance decreases, the control module can control the on-off valve to open, so that the exhaust gas re-enters the engine and reduces the temperature in the combustion chamber.

[0040] In one embodiment, the concentration detection element is a sulfide concentration detection element, which is used to detect the sulfide concentration in the exhaust gas. The corrosive substances generated by the engine are mainly sulfides such as SO, SO2 and SO3. Therefore, the concentration detection element provided by the embodiment of the present invention can be a sulfide concentration detection element, which can accurately determine the concentration of sulfides in the exhaust gas.

[0041] In one embodiment, Figure 1As shown, the cooler includes a cooling pipeline, in which coolant flows, and the engine power system also includes a pressure difference detection component, which is in communication connection with the control module, and the pressure difference detection component is used to detect the pressure difference between the liquid inlet and the liquid outlet of the cooling pipeline; the control module is also configured to: obtain the pressure difference detection signal emitted by the pressure difference detection component; and control the on-off of the branch pipe section according to the pressure difference detection signal. The cooling pipeline in the cooler is often blocked due to impurities in the coolant and other reasons. The blocked cooling pipeline cannot effectively cool the engine and exhaust gas. Long-term overheating of the engine will affect the service life of the engine and cause the engine to produce more harmful gases. Therefore, it is necessary to detect whether the cooling pipeline is blocked. The engine power system of the embodiment of the present invention also includes a pressure difference sensor, which can detect the pressure difference between the liquid inlet and liquid outlet of the cooling pipeline and send a pressure difference detection signal. The control module can determine whether the pressure difference in the cooling pipeline is normal based on the pressure difference detection signal. When the pressure difference exceeds the preset normal range, the control module determines that the cooling pipeline is blocked and can control the branch pipe section to be cut off to prevent harmful gases in the exhaust gas from entering the cooler. It can also control the engine to perform corresponding control to reduce the temperature in the engine combustion chamber. The coolant can be selected as water.

[0042] In one embodiment, Figure 1 As shown, the main line also includes an intake pipe section, which transmits external air to the engine intake end. The engine power system also includes a turbocharger, one end of which is connected to the exhaust pipe section, and the other end is connected to the intake pipe section. The high-pressure gas output from the exhaust pipe section provides power for the turbocharger, and the turbocharger compresses and transmits the gas in the intake pipe section.

[0043] In one embodiment, Figure 1 As shown, an intercooler for cooling the gas is also installed on the intake pipe section to reduce the temperature of the gas flowing into the engine and prevent the engine from overheating.

[0044] In one embodiment, Figure 1 As shown, a throttle valve is also installed on the intake pipe section, and the throttle valve can deliver gas to the engine at a stable flow rate to prevent the engine from running unstably due to excessive airflow.

[0045] In one embodiment, the engine includes a plurality of combustion chambers, and an intake manifold is provided at the intake end of the engine, and the intake manifold can distribute the gas entering the engine to each combustion chamber according to a preset ratio to ensure that each combustion chamber of the engine can work smoothly. An exhaust manifold is provided at the outlet end of the engine, and the exhaust manifold can merge the exhaust gas discharged from each combustion chamber and transmit it to the branch pipe section and the exhaust pipe section, so as to discharge the exhaust gas and recirculate the exhaust gas.

[0046] In one embodiment, a control method for an engine power system is provided, and the control method is applied to the above-mentioned engine power system, and the engine power system includes: an engine; a main pipe, the two ends of which are respectively connected to the exhaust end and the intake end of the engine, and the exhaust gas output by the engine flows in the main pipe; a cooler, which is installed on the main pipe and is used to reduce the temperature of the exhaust gas; a concentration detection element, which is installed on the main pipe and is used to detect the concentration of corrosive substances in the exhaust gas; a control module, which is in communication with the concentration detection element; Figure 2 FIG. 1 is a flow chart of a control method for an engine power system according to an embodiment of the present invention. The control method comprises the following steps:

[0047] S101, obtaining a concentration detection signal sent by a concentration detection component;

[0048] S102, determining the concentration of the corrosive substance according to the concentration detection signal;

[0049] S103, when the concentration of the corrosive substance is greater than a preset concentration threshold, the branch pipe section is cut off.

[0050] By adopting the above control method, when the concentration of corrosive substances in the exhaust gas is greater than the preset concentration threshold, the branch pipe section can be cut off in time to prevent the corrosive substances from entering the cooler and affecting the service life of the cooler.

[0051] In one embodiment, a cooling pipeline with coolant flowing inside the cooler, the engine power system also includes a pressure difference detection component that is communicatively connected to the control module, and the pressure difference detection component is used to detect the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline; the control method also includes: obtaining a pressure difference detection signal emitted by the pressure difference detection component; determining the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline according to the pressure difference detection signal; when the pressure difference is greater than a preset pressure difference threshold, the branch pipe section is cut off. When the cooling pipeline is blocked, the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline will exceed the preset pressure difference threshold. When the control module receives the pressure difference detection signal transmitted by the pressure difference sensor, it can determine whether the cooling pipeline is blocked. When the cooling pipeline is blocked, the control module can cut off the branch pipe section and control the engine to perform corresponding cooling operations to prevent the engine from overheating.

[0052] In one embodiment, the main line also includes an exhaust pipe section that connects the exhaust end of the engine to the outside atmosphere, and the concentration detection component is installed on the exhaust pipe section. The control method also includes: after the branch pipe section is cut off, limiting the output power of the engine; obtaining a pressure difference detection signal and a concentration detection signal in real time; when the concentration of the corrosive substance is less than or equal to a preset concentration threshold and the pressure difference is less than or equal to a preset pressure difference threshold, stopping limiting the output power of the engine.

[0053] The exhaust pipe section can discharge most of the exhaust gas generated by the engine into the atmosphere to complete the air circulation in the engine. After the branch pipe section is cut off, the control module can obtain the pressure difference detection signal transmitted by the pressure difference detection component and the concentration detection signal transmitted by the concentration detection component in real time. The control module limits the output power of the engine to prevent the combustion chamber of the engine from being too high and emitting high concentrations of harmful gases, and also prevents the combustion chamber from being overheated, affecting the service life of the engine. When the concentration of the corrosive substance is less than or equal to the preset concentration threshold, and the pressure difference is less than or equal to the preset pressure difference threshold, the control module can determine that the concentration of the corrosive substance in the exhaust gas is low and the cooling pipeline is no longer blocked, and then confirm that the cooler can work normally and the concentration of the corrosive substance in the exhaust gas meets the standard, which has little impact on the life of the cooler. Subsequently, the control module opens the on-off valve to allow part of the exhaust gas to flow back into the engine, limit the temperature of the engine, and cancel the restriction on the engine output power, so that the engine can work normally.

[0054] In one embodiment, the engine power system further includes a warning component, and the control method further includes: when the branch pipe section is cut off, controlling the warning component to issue a warning prompt. When the branch pipe section is cut off, the exhaust gas cannot cool the combustion chamber in the engine, and the warning component can issue a prompt to the user so that the user can manually reduce the output power of the engine or repair the engine power system.

[0055] In a specific embodiment, the warning device is a sound prompter. When the branch pipe section is cut off, the sound prompter emits a preset prompt sound to warn the user.

[0056] In another specific embodiment, the engine power system is applied to a vehicle, and the warning component is a flashing light in the vehicle body. When the branch pipe section is cut off, the flashing light in the vehicle body flashes to warn the user.

[0057] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An engine power system, characterized in that: The engine power system comprises: engine; A main pipe, the two ends of which are respectively connected to the air outlet and the air inlet of the engine, and the exhaust gas output by the engine flows in the main pipe; A cooler installed on the main pipe and used to reduce the temperature of the exhaust gas; A concentration detection component installed on the main pipe, the concentration detection component is used to detect the concentration of corrosive substances in the exhaust gas; A control module is connected in communication with the concentration detection element and is configured to: Acquiring a concentration detection signal sent by the concentration detection component; The branch pipe section between the air outlet end of the engine and the air inlet end of the cooler is controlled to be on and off according to the concentration detection signal.

2. The engine power system according to claim 1, characterized in that: The main pipeline also includes an exhaust pipe section connecting the air outlet of the engine with the outside atmosphere, and the concentration detection component is installed on the exhaust pipe section.

3. The engine power system according to claim 1, characterized in that: The engine power system further comprises an on-off valve installed on the branch pipe section, wherein the on-off valve is communicatively connected with the control module and is used to switch on and off the branch pipe section according to an on-off control instruction issued by the control module.

4. The engine power system according to claim 3, characterized in that: The concentration detection component is installed on the branch pipe section between the engine outlet end and the on-off valve.

5. The engine power system according to claim 1, characterized in that: The concentration detection component is a sulfide concentration detection component, and the sulfide concentration detection component is used to detect the sulfide concentration in the exhaust gas.

6. The engine power system according to any one of claims 1 to 5, characterized in that: The cooler includes a cooling pipeline, in which coolant flows, and the engine power system also includes a pressure difference detection component, which is in communication connection with the control module, and the pressure difference detection component is used to detect the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline; the control module is further configured as follows: Acquiring a pressure difference detection signal emitted by the pressure difference detection element; The branch pipe section is controlled to be on and off according to the pressure difference detection signal.

7. A control method for an engine power system, characterized in that: The control method is applied to an engine power system according to any one of claims 1 to 6, the engine power system comprising: an engine; a main pipe, the two ends of which are respectively connected to an exhaust end and an intake end of the engine, and the exhaust gas output by the engine flows in the main pipe; a cooler, which is installed on the main pipe and is used to reduce the temperature of the exhaust gas; a concentration detection element, which is installed on the main pipe and is used to detect the concentration of corrosive substances in the exhaust gas; a control module, which is in communication with the concentration detection element; The control method comprises the following steps: Acquiring a concentration detection signal sent by the concentration detection component; determining the concentration of the corrosive substance according to the concentration detection signal; When the concentration of the corrosive substance is greater than a preset concentration threshold, the branch pipe section is cut off.

8. The control method of the engine power system according to claim 7, characterized in that: The cooler includes a cooling pipeline, and coolant flows in the cooling pipeline. The engine power system also includes a pressure difference detection component, and the pressure difference detection component is communicatively connected with the control module, and the pressure difference detection component is used to detect the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline; the control method also includes: Acquiring a pressure difference detection signal emitted by the pressure difference detection element; Determining the pressure difference between the liquid inlet end and the liquid outlet end of the cooling pipeline according to the pressure difference detection signal; When the pressure difference is greater than a preset pressure difference threshold, the branch pipe section is cut off.

9. The control method of the engine power system according to claim 8, characterized in that: The main pipeline also includes an exhaust pipe section connecting the exhaust end of the engine with the outside atmosphere, the concentration detection element is installed on the exhaust pipe section, and the control method also includes: After the branch pipe section is cut off, limiting the output power of the engine; acquiring the pressure difference detection signal and the concentration detection signal in real time; When the concentration of the corrosive substance is less than or equal to a preset concentration threshold, and the pressure difference is less than or equal to a preset pressure difference threshold, the branch pipe section is turned on and the output power of the engine is stopped from being restricted.

10. The control method of the engine power system according to any one of claims 7 to 9, characterized in that: The engine power system further includes a warning component, and the control method further includes: When the branch pipe section is cut off, the control warning component issues a warning prompt.

Images