CN115288829A - A DPF regeneration control method of a crane diesel particulate filter - Google Patents

Abstract

The present application discloses a DPF regeneration control method of a crane diesel particulate filter, which relates to the technical field of automatic control. The method includes: the engine determines that the carbon load of the DPF meets a set condition; condition, or determine that the atmospheric pressure satisfies the second condition, or determine that the exhaust temperature satisfies the third condition, or determine that the exhaust temperature rise rate satisfies the fourth condition, or determine that the output torque of the engine satisfies the fifth condition condition, the engine turns on the hydraulic auxiliary heating system; the engine controls the hydraulic pump in the hydraulic auxiliary heating system to work. By adopting the application, the fuel consumption of the whole vehicle regenerated by the hoisting operation is reduced.

Description

A DPF regeneration control method for crane diesel particulate filter

technical field

The present application relates to the technical field of automatic control, in particular to a DPF regeneration control method of a crane diesel particulate filter.

Background technique

At present, the aftertreatment of truck cranes is usually equipped with a diesel particulate filter (Diesel Particulate Filter, DPF), which traps carbon particles in the engine exhaust through the DPF. As the carbon particles accumulate during the use of the DPF, the engine exhaust back pressure increases, resulting in Reduced engine economy and power. Therefore, in the actual use process, it is necessary to eliminate the carbon particles accumulated in the DPF through chemical reactions, that is, DPF regeneration.

DPF regeneration includes passive regeneration and active regeneration. DPF passive regeneration requires exhaust temperature ≥ 280°C, carbon particles in DPF react with NOx in engine exhaust gas to reduce carbon particles in DPF, passive regeneration of DPF does not require additional fuel consumption of the vehicle; active regeneration of DPF passes fuel in the air according to specific logic Combustion in DOC increases the temperature of DPF, realizes the reaction of carbon particles and _O2 in exhaust gas, reduces DPF carbon particles, and active regeneration of DPF requires additional fuel consumption of the whole vehicle.

The hoisting operation regeneration function of the crane was developed in the early stage, and the hoisting condition realized active regeneration. However, under low-load hoisting or standby conditions, there will be a problem that the crane’s long-term idling exhaust temperature does not meet the regeneration temperature requirements, resulting in high fuel consumption for hoisting regeneration. .

Contents of the invention

The embodiment of the present application provides a DPF regeneration control method for a diesel particulate filter of a crane, which solves the problem that the exhaust temperature of the crane at idle speed for a long time does not meet the regeneration temperature requirement, and reduces the fuel consumption of the regeneration vehicle during hoisting operations.

In the first aspect, the embodiment of the present application provides a DPF regeneration control method, including:

The engine determines that the carbon load of the DPF meets the set conditions;

If the engine determines that the ambient temperature satisfies the first condition, or determines that the atmospheric pressure satisfies the second condition, or determines that the exhaust temperature satisfies the third condition, or determines that the exhaust temperature rise rate satisfies the fourth condition, or It is determined that the output torque of the engine satisfies the fifth condition, and the engine turns on the hydraulic auxiliary heating system;

The engine controls the operation of the hydraulic pump in the hydraulic auxiliary heating system.

In some embodiments, before the engine starts the hydraulic auxiliary heating system, the method further includes:

The engine determines to enter the hoisting operation regeneration mode according to the received remote throttle switching switch signal.

In some embodiments, the engine controls the operation of the hydraulic pump in the hydraulic auxiliary heating system, including:

When the hydraulic auxiliary heating system is turned on, the engine controls the displacement of the hydraulic pump to be a set first basic displacement.

In some embodiments, the engine controls the operation of the hydraulic pump in the hydraulic auxiliary heating system according to the set displacement, including:

The engine calculates a temperature deviation between a set value of the DPF temperature and an actual value of the DPF temperature;

The engine controls the displacement of the hydraulic pump to be proportional to the temperature deviation.

In some embodiments, the engine controls the operation of the hydraulic pump in the hydraulic auxiliary heating system according to the set displacement, including:

The engine controls the real-time displacement of the hydraulic pump to be less than or equal to the maximum displacement set for the hydraulic pump.

In some embodiments, the determining that the ambient temperature satisfies the first condition includes:

determining that the ambient temperature is less than or equal to the set second temperature;

The determined exhaust temperature satisfies the third condition, including:

It is determined that the duration for which the exhaust temperature is less than or equal to the set third temperature is greater than or equal to the set first time period.

In some embodiments, the determining the exhaust temperature rise rate satisfies the fourth condition, including:

Determine that the exhaust temperature rise rate is less than or equal to the set first rate.

In some embodiments, the determining that the output torque of the engine satisfies the fifth condition includes:

It is determined whether the duration during which the output torque of the engine is less than or equal to the set first torque is greater than or equal to the set second duration.

In some embodiments, the determining that the exhaust temperature satisfies the sixth condition includes:

Determine that the discharge temperature is greater than or equal to the set third temperature.

In some embodiments, the determination that the exhaust temperature rise rate satisfies the seventh condition includes:

Determine that the exhaust temperature rise rate is greater than or equal to the set second rate.

In some embodiments, after the engine starts the hydraulic auxiliary heating system, the method further includes:

If the engine determines that the exhaust temperature satisfies the sixth condition, or determines that the exhaust temperature rise rate meets the seventh condition, or determines that the pressure of the hydraulic auxiliary heating system meets the eighth condition, or determines the pressure change rate of the hydraulic auxiliary heating system If the ninth condition is met, or the engine receives an action signal, the engine turns off the hydraulic auxiliary heating system.

In some embodiments, the method is performed by an ECU in the engine.

In some embodiments, the carbon load of the DPF satisfies a set condition, including: the carbon load of the DPF is greater than or equal to the set carbon load.

In a third aspect, the embodiment of the present application provides a DPF regeneration control device for a crane diesel particulate filter, including:

A determination module, configured to determine that the carbon load of the DPF satisfies the set conditions;

Opening a module, for if the engine determines that the ambient temperature meets the first condition, or determines that the atmospheric pressure meets the second condition, or determines that the exhaust temperature meets the third condition, or determines that the rate of increase in exhaust temperature meets the The fourth condition, or determining that the output torque of the engine satisfies the fifth condition, the engine turns on the hydraulic auxiliary heating system;

The control module is used to control the operation of the hydraulic pump in the hydraulic auxiliary heating system.

In some embodiments, the determination module is further configured to determine to enter the hoisting operation regeneration mode according to the received signal of the remote throttle switching switch.

In some embodiments, the control module is configured to control the displacement of the hydraulic pump by the engine to a set first basic displacement when the hydraulic auxiliary heating system is turned on.

In some embodiments, the control module is used to calculate the temperature deviation between the set value of the DPF temperature and the actual value of the DPF temperature; the displacement of the hydraulic pump is proportional to the temperature deviation.

In some embodiments, the control module is configured to control the real-time displacement of the hydraulic pump to be less than or equal to the maximum displacement set for the hydraulic pump.

In some embodiments, the determining module is configured to determine that the ambient temperature is less than or equal to the set second temperature; determine that the duration of the discharge temperature being less than or equal to the set third temperature is greater than or equal to the set first time length .

In some embodiments, the determination module is configured to determine that the rate of increase in exhaust temperature is less than or equal to the set first rate.

In some embodiments, the determination module is configured to determine whether the duration during which the output torque of the engine is less than or equal to the set first torque is greater than or equal to the set second time period.

In some embodiments, the determination module is configured to determine that the exhaust temperature is greater than or equal to the set third temperature.

In some embodiments, the determining module is configured to determine that the rate of increase in exhaust temperature is greater than or equal to a set second rate.

In some embodiments, the device further includes: a shutdown module, configured to determine that the exhaust temperature of the engine satisfies the sixth condition, or determine that the exhaust temperature rise rate satisfies the seventh condition, or determine the pressure of the hydraulic auxiliary heating system If the eighth condition is met, or it is determined that the pressure change rate of the hydraulic auxiliary heating system meets the ninth condition, or the engine receives an action signal, the engine shuts down the hydraulic auxiliary heating system.

It can be seen that the embodiment of the present application has the following beneficial effects:

In the embodiment of this application, through the development of the hydraulic auxiliary heating system, during the hoisting process of the crane, according to the external conditions and the actual temperature of the post-processing, the engine automatically turns on the hydraulic auxiliary heating system, and the hydraulic auxiliary heating system automatically controls the load change of the hydraulic pump to quickly increase the DPF temperature. Complete the lifting operation regeneration. The method solves the problem that the exhaust temperature of the crane at idle speed for a long time does not meet the requirement of the regeneration temperature, and reduces the fuel consumption of the whole vehicle regeneration during the hoisting operation.

Description of drawings

Fig. 1 is a schematic structural diagram of a hydraulic auxiliary heating system provided by an embodiment of the present application;

FIG. 2 is a flow chart of a DPF regeneration control method provided in an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a DPF regeneration control device provided by an embodiment of the present application.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and understandable, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, technical terms involved in the embodiments of the present application will first be described below.

Electronic Control Unit (Electronic Control Unit, ECU): The electronic control unit of the engine is a controller that performs calculation, processing, and judgment based on the signals input by various sensors, and then outputs instructions to control the action of the actuator.

Remote throttle switch signal: It is a switch signal, used to switch the engine off throttle, outrigger throttle, and remote throttle status. After the remote throttle switch signal is activated, the engine receives the outrigger throttle and remote throttle signals.

DPF regeneration: It is a chemical reaction. The carbon particles in the DPF react with O2, NO, and NO2 in the engine exhaust gas at different temperatures to eliminate the carbon particles in the DPF.

Hydraulic pump: It is a component that is driven by external force, sucks oil from the hydraulic oil tank, forms pressure oil and discharges it, and sends it to the actuator.

Hydraulic auxiliary heating system: As shown in Figure 1, the hydraulic auxiliary heating system includes hydraulic pumps, main valves, overflow valves, and hydraulic oil tanks. The hydraulic system overflows under certain conditions to increase the engine load and finally increase the DPF temperature.

Hydraulic pump displacement: the volume of liquid discharged by the change of the geometric size of the sealed cavity for each revolution (or one radian) of the drive shaft of the hydraulic pump.

Fig. 2 is a flowchart of a DPF regeneration control method provided by an embodiment of the present application. The system on which the method shown in FIG. 2 is based includes ECU, DPF, remote accelerator switch, hydraulic pump, and vehicle motion control handle. The method shown in FIG. 2 includes the following steps S101 to S103. The method shown in Figure 2 is executed by the engine. In a possible implementation manner, the method shown in Fig. 2 is specifically executed by an ECU in the engine.

Step S101 , the engine determines that the carbon load of the DPF satisfies a set condition.

In some embodiments, the carbon load of the DPF satisfies a set condition, including: the carbon load of the DPF is greater than or equal to the set carbon load.

Step S102, if the engine determines that the ambient temperature meets the first condition, or determines that the atmospheric pressure meets the second condition, or determines that the exhaust temperature meets the third condition, or determines that the exhaust temperature rise rate meets the fourth condition, or determines that the output torque of the engine meets the first condition Five conditions, the engine turns on the hydraulic auxiliary heating system.

In this embodiment, the engine automatically judges conditions such as ambient temperature, atmospheric pressure, exhaust temperature, engine output torque, etc., and if any condition is met, the hydraulic auxiliary heating system is automatically turned on. In order to distinguish the description, use "first condition" and "second condition" to distinguish and describe multiple different conditions.

Step S103, the engine controls the hydraulic pump in the hydraulic auxiliary heating system to work.

The engine controls the hydraulic pump to work, thereby increasing the load of the engine, and then increasing the exhaust temperature of the engine to meet the temperature required for DPF regeneration.

In the method provided in this embodiment, through the development of the hydraulic auxiliary heating system, during the hoisting process of the crane, according to the external conditions and the actual temperature of the post-processing, the engine automatically turns on the hydraulic auxiliary heating system, and the hydraulic auxiliary heating system automatically controls the load change of the hydraulic pump to quickly increase DPF temperature, complete the hoisting operation regeneration. The method solves the problem that the exhaust temperature of the crane at idle speed for a long time does not meet the requirement of the regeneration temperature, and reduces the fuel consumption of the whole vehicle regeneration during the hoisting operation.

In some embodiments, before the engine starts the hydraulic auxiliary heating system, the engine determines to enter the hoisting operation regeneration mode according to the received remote throttle switch signal.

The remote throttle switching switch signal is used to indicate the start of the hoisting operation regeneration mode. The function of receiving the remote throttle switching switch signal is that since the working mode of the engine in the crane includes driving mode and hoisting operation regeneration mode, in the driving mode, the load of the engine is higher and the temperature is higher, so the temperature required for DPF regeneration can usually be met ;In the hoisting operation mode, the load of the engine is low, such as when the weight of the hoisted cargo is low, or during the period of waiting for the hoisted cargo, the load of the engine is low and the temperature is low, so the temperature can be raised to quickly perform DPF regeneration needs. Through the above implementation method, the engine can distinguish whether the working mode is the driving mode or the hoisting operation regeneration mode through the remote throttle switching switch signal, and then execute the process of controlling the hydraulic pump to lift the load in the hoisting operation regeneration mode. Executes the process of controlling hydraulic pumps to lift loads, increasing efficiency.

Alternatively, the engine does not switch the switch signal through the remote throttle, but determines the regeneration mode of the hoisting operation in other ways, for example, designing a switch for the regeneration mode of the hoisting operation, the driver triggers the operation of the switch, and the engine detects the driver's operation so that Make sure to enter the hoisting operation regeneration mode.

The overall flow of the DPF regeneration control method has been described above, and the working flow of the hydraulic auxiliary heating system in the method will be illustrated below with an example.

For example, when the hydraulic auxiliary heating system is turned on, during the regeneration process of the hoisting operation, it is judged whether the post-processing temperature has reached the set first temperature, if the post-processing temperature has not reached the set first temperature, the hydraulic auxiliary The heating system opens the overflow passage, and the engine controls the hydraulic pump in the hydraulic auxiliary heating system to work according to the set displacement, and increases the aftertreatment temperature by increasing the engine load.

For the specific process of the engine controlling the operation of the hydraulic pump, three possible displacement control modes are used as examples to illustrate below.

Displacement control mode 1. When the hydraulic auxiliary heating system is turned on, the engine controls the displacement of the hydraulic pump to be a set first basic displacement.

Displacement control method 2: The engine calculates the temperature deviation between the set value of the DPF temperature and the actual value of the DPF temperature; the engine controls the displacement of the hydraulic pump in direct proportion to the temperature deviation. That is, if the temperature deviation is larger, the displacement of the hydraulic pump is controlled to be larger, and the load applied by the hydraulic pump to the engine is larger, which is beneficial to increase the temperature of the DPF.

For example, the engine uses the following formula to control the displacement of the hydraulic pump.

Vx=V1×[T0-Tx]/constant;

Wherein, Vx represents the real-time value of the hydraulic pump control displacement, T0 represents the set value of the DPF temperature, and Tx represents the actual value of the DPF temperature.

Displacement control mode 3: The engine controls the real-time displacement of the hydraulic pump to be less than or equal to the maximum displacement set for the hydraulic pump.

The trigger conditions for turning on the hydraulic auxiliary heating system, ie, the first condition to the fifth condition in the above-mentioned embodiment, are illustrated below.

For example, the ambient temperature meeting the first condition is: the ambient temperature is less than or equal to the set second temperature.

For example, the atmospheric pressure satisfying the second condition is: the atmospheric pressure is less than or equal to the set first pressure.

For example, the exhaust temperature satisfies the third condition as follows: the exhaust temperature is less than or equal to the set third temperature, and the duration for which the exhaust temperature is less than or equal to the set third temperature is greater than or equal to the set first time period.

For example, the exhaust temperature rise rate satisfies the fourth condition: the exhaust temperature rise rate is less than or equal to the set first rate.

For example, the output torque of the engine satisfies the fifth condition: the output torque of the engine is less than or equal to the set first torque, and the output torque is less than or equal to the set first torque and greater than or equal to the set second duration .

In some embodiments, a mechanism to automatically shut down the hydraulic auxiliary heating system is provided. Specifically, after the engine turns on the hydraulic auxiliary heating system, if the engine determines that the exhaust temperature satisfies the sixth condition, or determines that the exhaust temperature rise rate meets the seventh condition, or determines that the pressure of the hydraulic auxiliary heating system meets the eighth condition, or determines that the hydraulic auxiliary heating The pressure change rate of the system satisfies the ninth condition, or the engine receives an action signal, and the engine turns off the hydraulic auxiliary heating system.

The purpose of the above design to automatically shut down the hydraulic auxiliary heating system is that, if any of the above-mentioned sixth to ninth conditions is met, it indicates that the engine load is high and the exhaust temperature is high, and the current requirement for DPF regeneration can already be met. Therefore, turning off the hydraulic auxiliary heating system will basically not hinder the regeneration of the DPF; furthermore, by automatically turning off the hydraulic auxiliary heating system, the power consumption generated by running the hydraulic auxiliary heating system can be saved, thus improving the operation efficiency of the whole machine. efficiency.

Alternatively, instead of using the above-mentioned mechanism for automatically shutting down the hydraulic auxiliary heating system, a switch for shutting down the hydraulic auxiliary heating system is designed, and the driver triggers the switch to turn off the hydraulic auxiliary heating system.

The trigger conditions for shutting down the hydraulic auxiliary heating system, ie, the sixth condition to the ninth condition in the above-mentioned embodiment, are illustrated below.

For example, the exhaust temperature satisfies the sixth condition: the exhaust temperature is greater than or equal to the set third temperature.

For example, the exhaust temperature rise rate satisfies the seventh condition: the exhaust temperature rise rate is greater than or equal to the set second rate.

For example, the pressure of the hydraulic auxiliary heating system satisfies the eighth condition: the pressure of the hydraulic auxiliary heating system is greater than or equal to the set first pressure.

For example, the pressure change rate of the hydraulic auxiliary heating system satisfies the ninth condition: the pressure change rate is greater than or equal to the set first rate.

FIG. 3 is a schematic structural diagram of a DPF regeneration control device 200 provided in an embodiment of the present application, including:

A determination module 201, configured to determine that the carbon load of the DPF satisfies the set conditions;

Opening module 202, used to determine if the engine determines that the ambient temperature meets the first condition, or determines that the atmospheric pressure meets the second condition, or determines that the exhaust temperature meets the third condition, or determines that the exhaust temperature rise rate meets the fourth condition, or determines the output of the engine When the torque meets the fifth condition, the engine turns on the hydraulic auxiliary heating system;

The control module 203 is used to control the operation of the hydraulic pump in the hydraulic auxiliary heating system.

In some embodiments, the determination module 201 is further configured to determine to enter the hoisting operation regeneration mode according to the received remote throttle switch signal.

In some embodiments, the control module 203 is configured to control the displacement of the hydraulic pump by the engine to a set first basic displacement when the hydraulic auxiliary heating system is turned on.

In some embodiments, the control module 203 is configured to calculate the temperature deviation between the set value of the DPF temperature and the actual value of the DPF temperature; the displacement of the hydraulic pump is proportional to the temperature deviation.

In some embodiments, the control module 203 is used to control the real-time displacement of the hydraulic pump to be less than or equal to the maximum displacement set for the hydraulic pump.

In some embodiments, the determination module 201 is configured to determine that the ambient temperature is less than or equal to the set second temperature; and determine that the duration for which the exhaust temperature is less than or equal to the set third temperature is greater than or equal to the set first time period.

In some embodiments, the determining module 201 is configured to determine that the rate of increase in exhaust temperature is less than or equal to a set first rate.

In some embodiments, the determination module 201 is configured to determine whether the duration during which the output torque of the engine is less than or equal to the set first torque is greater than or equal to the set second time period.

In some embodiments, the determination module 201 is configured to determine that the exhaust temperature is greater than or equal to a set third temperature.

In some embodiments, the determination module 201 is configured to determine that the rate of increase in exhaust temperature is greater than or equal to a set second rate.

In some embodiments, the device 200 further includes: a shutdown module, configured to determine that the exhaust temperature of the engine satisfies the sixth condition, or determine that the exhaust temperature rise rate satisfies the seventh condition, or determine that the pressure of the hydraulic auxiliary heating system satisfies the eighth condition, Or it is determined that the pressure change rate of the hydraulic auxiliary heating system satisfies the ninth condition, or the engine receives an action signal, and the engine shuts down the hydraulic auxiliary heating system.

Regarding the apparatus in the foregoing embodiments, the specific manner in which each module executes operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system or device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part.

It should be understood that in this application, "at least one (item)" means one or more, and "multiple" means two or more. "And/or" is used to describe the association relationship of associated objects, indicating that there can be three types of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and A and B exist at the same time , where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c ", where a, b, c can be single or multiple.

It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or apparatus comprising that element.

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be directly implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Therefore, the present application will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A crane diesel particulate trap (DPF) regeneration control method is characterized by comprising the following steps:

the engine determines that the carbon loading of the DPF meets the set conditions;

if the engine determines that the ambient temperature meets the first condition, or determines that the atmospheric pressure meets the second condition, or determines that the exhaust temperature meets the third condition, or determines that the exhaust temperature rise rate meets the fourth condition, or determines that the output torque of the engine meets the fifth condition, the engine starts a hydraulic auxiliary heating system;

the engine controls the operation of a hydraulic pump in the hydraulic auxiliary heating system.

2. The method of claim 1, wherein prior to the engine turning on a hydraulically assisted heating system, the method further comprises:

and the engine determines to enter a hoisting operation regeneration mode according to the received remote throttle change-over switch signal.

3. The method of claim 1, wherein the engine controlling operation of a hydraulic pump in the hydraulically assisted heating system comprises:

when the hydraulic auxiliary heating system is started, the engine controls the displacement of the hydraulic pump to be a set first basic displacement.

4. The method of claim 1, wherein the engine controls operation of a hydraulic pump in the hydraulic auxiliary heating system according to a set displacement, comprising:

the engine calculates a temperature deviation between a set value of the DPF temperature and an actual value of the DPF temperature;

the engine controls the displacement of the hydraulic pump in direct proportion to the temperature deviation.

5. The method of claim 1, wherein the engine controls operation of a hydraulic pump in the hydraulically assisted heating system according to a set displacement, comprising:

the motor controls a real-time displacement of the hydraulic pump to be less than or equal to a maximum displacement set for the hydraulic pump.

6. The method of claim 1, wherein determining that the ambient temperature satisfies the first condition comprises:

determining that the ambient temperature is less than or equal to a set second temperature;

the determining that the exhaust temperature satisfies the third condition includes:

and determining that the duration of the exhaust temperature being less than or equal to the set third temperature is greater than or equal to the set first duration.

7. The method of claim 1, wherein the determining that the rate of exhaust temperature rise satisfies the fourth condition comprises:

and determining that the exhaust temperature rising rate is less than or equal to a set first rate.

8. The method of claim 1, wherein said determining that the output torque of the engine satisfies the fifth condition comprises:

it is determined whether a duration in which an output torque of the engine is less than or equal to a set first torque is greater than or equal to a set second duration.

9. The method of claim 1, wherein the determining that the exhaust temperature satisfies a sixth condition comprises:

and determining that the exhaust temperature is greater than or equal to the set third temperature.

10. The method of claim 1, wherein the determining that the rate of exhaust temperature rise satisfies a seventh condition comprises:

and determining that the exhaust temperature rising rate is greater than or equal to a set second rate.

11. The method of claim 1, wherein after the engine turns on a hydraulically assisted heating system, the method further comprises:

if the engine determines that the exhaust temperature meets a sixth condition, or determines that the exhaust temperature rising rate meets a seventh condition, or determines that the pressure of the hydraulic auxiliary heating system meets an eighth condition, or determines that the pressure change rate of the hydraulic auxiliary heating system meets a ninth condition, or the engine receives an action signal, the engine shuts off the hydraulic auxiliary heating system.

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