CN106828484A - A kind of engine accessory power rating moment of torsion acquisition methods and device - Google Patents

Abstract

A kind of engine accessory power rating moment of torsion acquisition methods and device that the present invention is provided, generator demand moment of torsion is obtained by accurate, electrical control electric fan demand torque, air pressure pump demand torque, steering pump demand torque and compressor of air conditioner demand torque, to the generator demand moment of torsion, the electrical control electric fan demand torque, the air pressure pump demand torque, the steering pump demand torque and the compressor of air conditioner demand torque carry out summation operation, obtain the demand torque of accurate engine accessory power rating, and then improve the precision of engine internal torque, and then improve the moment of torsion control precision of engine.

Description

Method and device for acquiring torque of engine accessories

technical field

The invention relates to the field of engine design, in particular to a method and device for acquiring torque of an engine accessory.

Background technique

Compared with pure electric vehicles, plug-in hybrid vehicles can not only take advantage of the long continuous working time of the engine and good power performance, but also take advantage of the advantages of no pollution and low noise of the motor, so plug-in hybrid vehicles are in the market. been widely applied.

The engine control mode of the plug-in hybrid electric vehicle is torque control, so the requirement for the torque control accuracy of the engine is relatively high. At present, the torque control accuracy of the engine is improved by improving the accuracy of the torque in the engine. Among them, the internal engine torque is the sum of the engine output torque, engine friction torque and engine attachment torque. However, the accurate calibration of the engine output torque and the engine friction torque has been realized at present, but the calibration of the torque of the engine's own accessories has not been realized, so how to obtain the torque of the engine's own accessories has become a problem.

Contents of the invention

In view of this, the present invention proposes a method and device for obtaining torque of an engine accessory, so as to achieve the purpose of improving the torque control accuracy of the engine.

In order to achieve the above purpose, the proposed scheme is as follows:

A method for acquiring torque of an engine accessory, comprising:

Obtain the generator demand torque;

Obtain the required torque of the electronically controlled fan;

Obtain the required torque of the air compressor;

Obtain the required torque of the steering pump;

Obtain the required torque of the air conditioner compressor;

A sum operation is performed on the generator required torque, the electronically controlled fan required torque, the air compressor required torque, the steering pump required torque and the air conditioner compressor required torque to obtain the required torque of the engine accessories.

Preferably, said obtaining the generator demand torque includes:

Using the relational generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient to calculate the generator demand torque;

The filtered actual torque of the generator is the torque obtained by filtering the actual torque of the generator, the actual torque of the generator is determined by the engine speed and the load rate of the generator, and the temperature compensation coefficient is obtained by calibrating the engine temperature , the time compensation coefficient is a calibratable time constant value determined according to the running time of the engine after starting.

Preferably, said obtaining the required torque of the electronically controlled fan includes:

Determine the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein, when the engine speed increases, the required torque of the electronically controlled fan increases, and when the operating state of the electronically controlled fan increases When , the required torque of the electronically controlled fan increases.

Preferably, when the electronically controlled fan is an electromagnetic clutch fan, the acquisition process of the operating state of the electronically controlled fan is:

Determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan;

determining the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan;

Wherein, determining the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan includes:

When the solenoid valve opening of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the solenoid valve opening when the medium-speed operation is opened, it is determined that the operation state of the electronically controlled fan is a medium-speed operation state;

When the solenoid valve opening of the electromagnetic clutch fan shows a decreasing trend and is less than the set value of the solenoid valve opening when the medium-speed operation is closed, it is determined that the operation state of the electronically controlled fan is a low-speed operation state;

When the solenoid valve opening of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the solenoid valve opening when the fan is opened at full speed, it is determined that the operating state of the electronically controlled fan is at full speed;

When the solenoid valve opening of the electromagnetic clutch fan shows a decreasing trend and is smaller than the set value of the solenoid valve opening when the fan is closed at full speed, it is determined that the electronically controlled fan is operating at a medium speed.

Preferably, said obtaining the required torque of the air compressor includes:

The required torque of the air compressor corresponding to the engine speed is queried in the preset required torque correspondence table of the air compressor, and the queried required torque of the air compressor is the required torque of the air compressor.

Preferably, said obtaining the required torque of the steering pump includes:

The required torque of the steering pump is determined according to the engine speed, and the determined required torque of the steering pump is a constant value that can be calibrated, and the constant value that can be calibrated is required to ensure the normal turning of the vehicle when the turning radius of the vehicle is large when the engine is idling. torque value.

Preferably, said obtaining the required torque of the air conditioner compressor includes:

The required torque of the air conditioner compressor is determined according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor increases.

An engine accessory torque acquisition device, comprising:

The first obtaining module is used to obtain the torque required by the generator;

The second obtaining module is used to obtain the required torque of the electronically controlled fan;

The third obtaining module is used to obtain the required torque of the air compressor;

The fourth obtaining module is used to obtain the required torque of the steering pump;

The fifth obtaining module is used to obtain the required torque of the air conditioner compressor;

A calculation module, configured to perform a sum operation on the generator demand torque, the electric fan control fan demand torque, the air pressure pump demand torque, the steering pump demand torque and the air conditioner compressor demand torque to obtain The required torque of the engine accessories.

Preferably, the first acquisition module includes:

The calculation unit is used to calculate the generator demand torque by using the relational generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient;

The filtered actual torque of the generator is the torque obtained by filtering the actual torque of the generator, the actual torque of the generator is determined by the engine speed and the load rate of the generator, and the temperature compensation coefficient is obtained by calibrating the engine temperature , the time compensation coefficient is a calibratable time constant value determined according to the running time of the engine after starting.

Preferably, the second acquisition module includes:

The first determining unit is configured to determine the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein when the engine speed increases, the required torque of the electronically controlled fan increases, and when the When the operating state of the electronically controlled fan increases, the required torque of the electronically controlled fan increases.

Preferably, when the electronically controlled fan is an electromagnetic clutch fan, the engine accessory torque acquisition device further includes:

A sixth acquisition module, configured to acquire the operating state of the electronically controlled fan;

The sixth acquisition module includes: a second determination unit, configured to determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan;

A third determining unit, configured to determine the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan;

Wherein, the third determination unit includes:

The first determining subunit is used to determine that the operating state of the electronically controlled fan is at a medium speed when the opening of the electromagnetic valve of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the opening of the solenoid valve when the medium speed is turned on operating status;

The second determination subunit is used to determine that the operating state of the electronically controlled fan is low-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan is in a decreasing trend and is less than the set value of the electromagnetic valve opening when the medium-speed operation is closed. state;

The third determining subunit is used to determine that the operating state of the electronically controlled fan is the full-speed operating state when the opening of the electromagnetic valve of the electromagnetic clutch fan is increasing and is greater than the set value of the opening of the electromagnetic valve when the full-speed operation is opened. ;

The fourth determining subunit is used to determine that the operating state of the electronically controlled fan is medium-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan shows a decreasing trend and is less than the set value of the electromagnetic valve opening when the full-speed operation is closed. state.

Preferably, the third acquisition module includes:

The inquiry unit is used to inquire the required torque of the air compressor corresponding to the engine speed in the preset required torque correspondence table of the air compressor, and the inquired required torque of the air compressor is the required torque of the air compressor.

Preferably, the fourth acquisition module includes:

The fourth determining unit is used to determine the required torque of the steering pump according to the engine speed, and the determined required torque of the steering pump is a constant value that can be calibrated, and the constant value that can be calibrated is when the turning radius of the vehicle is large when the engine is idling The torque value required to ensure the normal turning of the vehicle.

Preferably, the fifth acquisition module includes:

The fifth determining unit is configured to determine the required torque of the air conditioner compressor according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor increases.

Compared with the prior art, the technical solution of the present invention has the following advantages:

The above technical solution provides a method and device for acquiring torque of engine accessories, by accurately acquiring the demand torque of the generator, the demand torque of the electronically controlled fan, the demand torque of the air compressor, the demand torque of the steering pump and the demand torque of the air conditioner compressor, to control the power generation engine demand torque, the electronically controlled fan demand torque, the air pressure pump demand torque, the steering pump demand torque and the air conditioner compressor demand torque are summed to obtain the accurate demand torque of engine accessories, and then improve The accuracy of the torque in the engine can be improved, thereby improving the torque control accuracy of the engine.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a flow chart of a method for obtaining torque of an engine accessory provided by the present application;

Fig. 2 is a schematic diagram of the acquisition structure of the generator demand torque provided by the present application;

Fig. 3 is a schematic structural diagram of an engine accessory torque acquisition device provided by the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In this embodiment, the engine accessories specifically include a generator, an electronically controlled fan, an air compressor, a steering pump and an air conditioner compressor. Obtaining the torque of the engine accessories means obtaining the torque of the generator, electronically controlled fan, air compressor, steering pump and air conditioner compressor. Please refer to Fig. 1, which shows a flow chart of a method for obtaining torque of an engine accessory provided by the present invention, which may include the following steps:

Step S11: Obtain the generator demand torque.

Step S12: Obtain the required torque of the electronically controlled fan.

Step S13: Obtain the required torque of the air pump.

Step S14: Obtain the required torque of the steering pump.

Step S15: Obtain the required torque of the air conditioner compressor.

Step S16: Summing the generator demand torque, the electric control fan demand torque, the air pressure pump demand torque, the steering pump demand torque and the air conditioner compressor demand torque to obtain the engine accessories Torque required.

In this embodiment, by accurately obtaining the required torque of the generator, the required torque of the electronically controlled fan, the required torque of the air compressor pump, the required torque of the steering pump and the required torque of the air conditioner compressor, the required torque of the generator, the required torque of the electronically controlled fan The required torque, the required torque of the air compressor pump, the required torque of the steering pump and the required torque of the air conditioner compressor are summed to obtain the accurate required torque of the engine accessories, thereby improving the accuracy of the internal torque of the engine, and then improving the engine torque. torque control accuracy.

In this embodiment, the specific process of obtaining the required torque of the generator can be as follows:

The generator demand torque is calculated by using the relational expression generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient.

The filtered actual torque of the generator is the torque obtained after filtering the actual torque of the generator, and the actual torque of the generator is determined by the engine speed and the load rate of the generator ( Among them, T represents the actual torque of the generator, P represents the load rate of the generator, and n represents the engine speed), the temperature compensation coefficient is obtained by calibrating the engine temperature, and the time compensation coefficient is determined according to the running time after the engine starts. Scaled time constant value.

The specific process of determining the actual torque of the generator through the engine speed and the generator load rate can be as follows: according to the formula, the engine speed is used as the x-axis, and the generator load rate is used as the y-axis to determine the curve of the z-axis, and the determined z The curve of the shaft is the curve of the actual torque of the generator.

The acquisition process of the engine speed is: since the generator speed and the engine speed are in a corresponding relationship, engine speed/generator speed=generator pulley diameter/engine crankshaft pulley diameter, that is, generator speed=generator pulley diameter/engine crankshaft Pulley diameter * generator speed. Alternator speed can be read directly from the plug-in hybrid vehicle.

The specific process of filtering the actual torque of the generator can be as follows: it can be calculated by the filtering formula y _n+1 =K*dt/T*u+y _n (1-dt/T), where K is the proportional coefficient (default is 1), dt is the sampling period (for example: 100ms), T is the time constant (for example: 500ms), u is the initial input value, y _n is the actual torque of the generator after filtering at the current moment (the default value is 0), y _n+1 is the actual torque of the generator after filtering at the next moment.

In this embodiment, the temperature compensation coefficient and the engine temperature have a piecewise linear relationship. As the engine temperature rises, the temperature compensation coefficient increases, and the specific value of the temperature compensation coefficient can be obtained through calibration.

The time compensation coefficient is a calibratable time constant value determined according to the running time after the engine is started. The specific setting of the time compensation coefficient can be: in order to compensate the battery energy consumed by starting the engine, the time compensation coefficient is relatively large (for example: 1, calibrated) within 60s after the engine is successfully started, and the compensation coefficient is constant after the engine is stable for 300s. Value (for example: 0.6, can be calibrated), the linear relationship between 60s and 300s gradually decreases from 0.9 to 0.6.

Please refer to FIG. 2 , which shows a schematic diagram of the acquisition structure of the required torque of the generator. The actual torque of the generator is determined by the engine speed and the load rate of the generator, and the actual torque of the generator is filtered to obtain the actual torque of the generator after filtering; the temperature compensation coefficient is determined according to the engine temperature; the time compensation coefficient is determined according to the running time of the engine after starting; After the generator is filtered, the actual torque, temperature compensation coefficient and time compensation coefficient are multiplied to obtain the generator demand torque.

In this embodiment, the specific process of obtaining the required torque of the electronically controlled fan is: determining the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein when the engine speed increases, the electronically controlled fan The required torque of the electronically controlled fan increases, and when the operating state of the electronically controlled fan increases, the required torque of the electronically controlled fan increases.

According to the engine speed and the operating state of the electronically controlled fan, the specific process of determining the required torque of the electronically controlled fan can be: taking the engine speed as the x-axis, taking the operating state of the electronically controlled fan as the y-axis, determining the curve of the z-axis, and the determined z The curve of the shaft is the curve of the required torque of the electronically controlled fan.

Wherein, when the electronically controlled fan is an electromagnetic clutch fan, the acquisition process of the operating state of the electronically controlled fan is:

Step A11: Determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan.

The set speed of the electromagnetic clutch fan increases as the engine temperature rises, and the relationship between the two is a piecewise linear relationship. According to the engine speed (x-axis) and the set speed (y-axis) of the electromagnetic clutch fan, the required solenoid valve opening (z-axis) can be obtained. When the engine speed is higher, the electromagnetic valve opening of the electromagnetic clutch fan is larger, and when the set speed of the electromagnetic clutch fan is higher, the electromagnetic valve opening of the electromagnetic clutch fan is also larger.

Step A12: Determine the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan.

Wherein, determining the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan includes:

When the solenoid valve opening of the electromagnetic clutch fan is an increasing trend and greater than the solenoid valve opening set value when the medium speed operation is opened (such as, the solenoid valve opening set value=50% when the medium speed operation is opened), It is determined that the operating state of the electronically controlled fan is a medium-speed operating state;

When the solenoid valve opening of the electromagnetic clutch fan is a decreasing trend and is less than the solenoid valve opening setting value (such as, the solenoid valve opening setting value=40% when the medium speed operation is closing) when the medium speed operation is closed, It is determined that the operating state of the electronically controlled fan is a low-speed operating state;

When the electromagnetic valve opening of the electromagnetic clutch fan is an increasing trend and greater than the set value of the electromagnetic valve opening when the full speed operation is opened (such as, the electromagnetic valve opening set value=80% when the full speed operation is opened), determine the The operating state of the electronically controlled fan is at full speed;

When the solenoid valve opening of the electromagnetic clutch fan is a decreasing trend and is less than the set value of the solenoid valve opening when the full speed operation is closed (such as, the solenoid valve opening set value=60% when the full speed operation is closed), determine the The operating state of the electronically controlled fan is a medium-speed operating state.

In this embodiment, the specific process of obtaining the required torque of the air compressor can be as follows: query the required torque of the air compressor corresponding to the engine speed in the preset corresponding relationship table of the required torque of the air compressor, and the obtained air compressor The required torque is the required torque of the air pressure pump.

Wherein, the preset corresponding relationship table of the required torque of the air compressor is a table of the corresponding relationship between the engine speed and the required torque of the air compressor.

The reason why the preset corresponding table of torque required by the air compressor is only the table of the corresponding relationship between the engine speed and the required torque of the air compressor is that the air compressor is driven by the engine through gears. And when it is higher than the set pressure value of the unloading valve, the unloading valve opens, and the air enters the atmosphere from the unloading port. At this time, the engine still drives the air compressor to rotate, but the air pump does not need torque. When it is lower than the unloading valve, it opens When the pressure value of the gas storage bottle is set, the unloading valve is closed, and the air compressor restarts to compress air into the gas storage bottle. At this time, the air compressor needs torque. However, due to the existence of the check valve, the power of the air compressor pump required for the increase of the pressure of the gas storage cylinder will not increase, so the torque required by the air compressor pump has nothing to do with the pressure of the gas storage cylinder, while the torque required by the air compressor and the pressure of the air compressor It depends on the speed of the engine and increases with the increase of the speed of the engine.

In this embodiment, the steering pump is used to increase power for steering. After the engine is started, in order to ensure the safety of the vehicle and avoid interruption of steering power, the engine steering pump needs to work all the time. After the hybrid vehicle switches the engine operation mode from pure electric, the steering pump is Work immediately. When the engine is running, the gear drives the steering pump to work, so the process of obtaining the required torque of the steering pump is: determine the required torque of the steering pump according to the engine speed, and the determined required torque of the steering pump is a constant value that can be calibrated. The calibrated constant value is the torque value required to ensure the normal turning of the vehicle when the turning radius of the vehicle is large when the engine is idling. The reason why the determined required torque of the steering pump is a calibratable constant value is that: as the engine speed increases, the required torque of the steering pump decreases, but since the required torque of the steering pump is small, the required torque of the steering pump can be a constant value .

The process of obtaining the required torque of the air conditioner compressor is: determining the required torque of the air conditioner compressor according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor increases.

The required torque of the air conditioner compressor is determined according to the engine speed, and when the engine speed increases, the reason why the required torque of the air conditioner compressor increases is that:

The air conditioner compressor is driven by the engine through the belt, and the compressor rotates with the engine after the engine starts. When the air-conditioning switch is turned on and it is detected that the ambient temperature inside the vehicle is higher than the set ambient temperature in the air-conditioning working vehicle (for example: Env_tONAC_C is 26°C, which can be calibrated), the air-conditioning controller controls its electronically controlled clutch to close, and the compressor rotates with the engine. Take the fixed-displacement compressor as an example (the displacement increases with the increase of the engine speed, it cannot automatically change the power output according to the cooling demand), the demand torque of the air conditioner compressor increases with the increase of the engine speed The relationship between increasing and increasing is CUR, which has nothing to do with the ambient temperature in the car. When it is detected that the air conditioner switch is off or the temperature in the car is lower than the set air conditioner off temperature (for example: EnV_tACOFF_C is 22°C, it can be calibrated), the air conditioner controller Control its control clutch to disconnect, the compressor is disengaged from the engine, and the air conditioner compression no longer rotates with the engine. At this time, the air conditioner compressor no longer needs torque (for example: AC_trqOFFSet_C is 0N.m, which can be calibrated).

Since the engine control mode of the plug-in hybrid electric vehicle is torque control, the accuracy of engine torque control is relatively high. If the torque of engine accessories is not considered or considered inaccurately, it will lead to inaccurate internal torque demanded by the engine, resulting in inaccurate fuel injection. Accurate, and then affect the power of the engine. The invention can realize the torque acquisition of engine accessories (generator, electric control fan, air compressor, steering pump, air conditioner compressor), without adding torque sensor, and adding the engine friction torque and engine output torque to obtain accurate torque The internal torque of the engine, and then realize the precise control of the engine torque, which can accurately reflect the driver's intention. The present invention can be applied to plug-in hybrid vehicles with different structures (series, parallel, and hybrid) that adopt engine torque control.

For the aforementioned method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, Certain steps may be performed in other orders or simultaneously.

The following are device embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For the details not disclosed in the device embodiment of the present invention, please refer to the method embodiment of the present invention.

This embodiment provides an engine accessory torque acquisition device, please refer to Figure 3, the engine accessory torque acquisition device includes: a first acquisition module 31, a second acquisition module 32, a third acquisition module 33, a fourth acquisition module 34, a 5. An acquisition module 35 and a calculation module 36.

The first acquiring module 31 is configured to acquire the required torque of the generator.

The second acquiring module 32 is configured to acquire the required torque of the electronically controlled fan.

The third acquisition module 33 is configured to acquire the required torque of the air compressor.

The fourth acquisition module 34 is configured to acquire the required torque of the steering pump.

The fifth acquiring module 35 is configured to acquire the required torque of the air conditioner compressor.

A calculation module 36, configured to perform a summation operation on the generator required torque, the fan electronically controlled fan required torque, the air compressor required torque, the steering pump required torque and the air conditioner compressor required torque, Get the requested torque of the engine accessories.

In this embodiment, the first acquisition module 31 may specifically include: a calculation unit, configured to calculate the generator demand torque using the relational generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient ;

The filtered actual torque of the generator is the torque obtained by filtering the actual torque of the generator, the actual torque of the generator is determined by the engine speed and the load rate of the generator, and the temperature compensation coefficient is obtained by calibrating the engine temperature , the time compensation coefficient is a calibratable time constant value determined according to the running time of the engine after starting.

In this embodiment, the second acquisition module 32 may specifically include: a first determination unit, configured to determine the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein, when the engine speed increases , the required torque of the electronically controlled fan increases, and when the operating state of the electronically controlled fan increases, the required torque of the electronically controlled fan increases.

When the electronically controlled fan is an electromagnetic clutch fan, the engine accessory torque obtaining device further includes: a sixth obtaining module, configured to obtain the operating state of the electronically controlled fan.

The sixth acquiring module may specifically include: a second determining unit and a third determining unit.

The second determination unit is used to determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan;

The third determining unit is configured to determine the operating state of the electronically controlled fan according to the opening degree of the solenoid valve of the electromagnetic clutch fan.

The third determination unit includes: a first determination subunit, a second determination subunit, a third determination subunit and a fourth determination subunit.

The first determining subunit is used to determine that the operating state of the electronically controlled fan is at a medium speed when the opening of the electromagnetic valve of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the opening of the solenoid valve when the medium speed is turned on operating status;

The second determination subunit is used to determine that the operating state of the electronically controlled fan is low-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan is in a decreasing trend and is less than the set value of the electromagnetic valve opening when the medium-speed operation is closed. state;

The third determining subunit is used to determine that the operating state of the electronically controlled fan is the full-speed operating state when the opening of the electromagnetic valve of the electromagnetic clutch fan is increasing and is greater than the set value of the opening of the electromagnetic valve when the full-speed operation is opened. ;

The fourth determining subunit is used to determine that the operating state of the electronically controlled fan is medium-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan shows a decreasing trend and is less than the set value of the electromagnetic valve opening when the full-speed operation is closed. state.

In this embodiment, the third obtaining module 33 may specifically include: a query unit, configured to query the required torque of the air pump corresponding to the engine speed in the preset corresponding relationship table of the required torque of the air pump, and the queried The required torque of the pressure pump is the required torque of the air pressure pump.

In this embodiment, the fourth obtaining module 34 may specifically include: a fourth determining unit, configured to determine the steering pump required torque according to the engine speed, and the determined required steering pump torque is a calibratable constant value, so The above calibrated constant value is the torque value required to ensure the normal turning of the vehicle when the turning radius of the vehicle is large when the engine is idling.

In this embodiment, the fifth obtaining module 35 may specifically include: a fifth determining unit, configured to determine the required torque of the air conditioner compressor according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor torque increase

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence. 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 exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments of the present invention enables those skilled in the art to make or use the present invention. 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 invention. Therefore, the present invention 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 (14)

1. A method for obtaining torque of an engine accessory, characterized in that, comprising: Obtain the generator demand torque; Obtain the required torque of the electronically controlled fan; Obtain the required torque of the air compressor; Obtain the required torque of the steering pump; Obtain the required torque of the air conditioner compressor; A sum operation is performed on the generator required torque, the electronically controlled fan required torque, the air compressor required torque, the steering pump required torque and the air conditioner compressor required torque to obtain the required torque of the engine accessories. 2. The method according to claim 1, wherein said obtaining the generator demand torque comprises: Using the relational generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient to calculate the generator demand torque; The filtered actual torque of the generator is the torque obtained by filtering the actual torque of the generator, the actual torque of the generator is determined by the engine speed and the load rate of the generator, and the temperature compensation coefficient is obtained by calibrating the engine temperature , the time compensation coefficient is a calibratable time constant value determined according to the running time of the engine after starting. 3. The method according to claim 2, wherein said obtaining the required torque of the electronically controlled fan comprises: Determine the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein, when the engine speed increases, the required torque of the electronically controlled fan increases, and when the operating state of the electronically controlled fan increases When , the required torque of the electronically controlled fan increases. 4. The method according to claim 3, wherein when the electronically controlled fan is an electromagnetic clutch fan, the acquisition process of the operating state of the electronically controlled fan is as follows: Determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan; determining the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan; Wherein, determining the operating state of the electronically controlled fan according to the opening degree of the electromagnetic valve of the electromagnetic clutch fan includes: When the solenoid valve opening of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the solenoid valve opening when the medium-speed operation is opened, it is determined that the operation state of the electronically controlled fan is a medium-speed operation state; When the solenoid valve opening of the electromagnetic clutch fan shows a decreasing trend and is less than the set value of the solenoid valve opening when the medium-speed operation is closed, it is determined that the operation state of the electronically controlled fan is a low-speed operation state; When the solenoid valve opening of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the solenoid valve opening when the fan is opened at full speed, it is determined that the operating state of the electronically controlled fan is at full speed; When the solenoid valve opening of the electromagnetic clutch fan shows a decreasing trend and is smaller than the set value of the solenoid valve opening when the fan is closed at full speed, it is determined that the electronically controlled fan is operating at a medium speed. 5. The method according to claim 3, wherein said obtaining the required torque of the air compressor comprises: The required torque of the air compressor corresponding to the engine speed is queried in the preset required torque correspondence table of the air compressor, and the queried required torque of the air compressor is the required torque of the air compressor. 6. The method according to claim 5, wherein said obtaining the required torque of the steering pump comprises: The required torque of the steering pump is determined according to the engine speed, and the determined required torque of the steering pump is a constant value that can be calibrated, and the constant value that can be calibrated is required to ensure the normal turning of the vehicle when the turning radius of the vehicle is large when the engine is idling. torque value. 7. The method according to claim 6, wherein said obtaining the required torque of the air conditioner compressor comprises: The required torque of the air conditioner compressor is determined according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor increases. 8. An engine accessory torque acquisition device, characterized in that it comprises: The first obtaining module is used to obtain the torque required by the generator; The second obtaining module is used to obtain the required torque of the electronically controlled fan; The third obtaining module is used to obtain the required torque of the air compressor; The fourth obtaining module is used to obtain the required torque of the steering pump; The fifth obtaining module is used to obtain the required torque of the air conditioner compressor; A calculation module, configured to perform a sum operation on the generator demand torque, the electric fan control fan demand torque, the air pressure pump demand torque, the steering pump demand torque and the air conditioner compressor demand torque to obtain The required torque of the engine accessories. 9. The device according to claim 8, wherein the first acquiring module comprises: The calculation unit is used to calculate the generator demand torque by using the relational generator demand torque=generator filtered actual torque×temperature compensation coefficient×time compensation coefficient; The filtered actual torque of the generator is the torque obtained by filtering the actual torque of the generator, the actual torque of the generator is determined by the engine speed and the load rate of the generator, and the temperature compensation coefficient is obtained by calibrating the engine temperature , the time compensation coefficient is a calibratable time constant value determined according to the running time of the engine after starting. 10. The device according to claim 9, wherein the second acquiring module comprises: The first determining unit is configured to determine the required torque of the electronically controlled fan according to the engine speed and the operating state of the electronically controlled fan, wherein when the engine speed increases, the required torque of the electronically controlled fan increases, and when the When the operating state of the electronically controlled fan increases, the required torque of the electronically controlled fan increases. 11. The device according to claim 9, wherein when the electronically controlled fan is an electromagnetic clutch fan, the engine accessory torque acquisition device further comprises: A sixth acquisition module, configured to acquire the operating state of the electronically controlled fan; The sixth acquisition module includes: a second determination unit, configured to determine the electromagnetic valve opening of the electromagnetic clutch fan according to the engine speed and the set speed of the electromagnetic clutch fan; A third determining unit, configured to determine the operating state of the electronically controlled fan according to the opening degree of the solenoid valve of the electromagnetic clutch fan; Wherein, the third determination unit includes: The first determining subunit is used to determine that the operating state of the electronically controlled fan is at a medium speed when the opening of the electromagnetic valve of the electromagnetic clutch fan shows an increasing trend and is greater than the set value of the opening of the solenoid valve when the medium speed is turned on operating status; The second determination subunit is used to determine that the operating state of the electronically controlled fan is low-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan is in a decreasing trend and is less than the set value of the electromagnetic valve opening when the medium-speed operation is closed. state; The third determining subunit is used to determine that the operating state of the electronically controlled fan is the full-speed operating state when the opening of the electromagnetic valve of the electromagnetic clutch fan is increasing and is greater than the set value of the opening of the electromagnetic valve when the full-speed operation is opened. ; The fourth determining subunit is used to determine that the operating state of the electronically controlled fan is medium-speed operation when the electromagnetic valve opening of the electromagnetic clutch fan shows a decreasing trend and is less than the set value of the electromagnetic valve opening when the full-speed operation is closed. state. 12. The device according to claim 9, wherein the third acquiring module comprises: The inquiry unit is used to inquire the required torque of the air compressor corresponding to the engine speed in the preset required torque correspondence table of the air compressor, and the inquired required torque of the air compressor is the required torque of the air compressor. 13. The device according to claim 12, wherein the fourth acquiring module comprises: The fourth determining unit is used to determine the required torque of the steering pump according to the engine speed, and the determined required torque of the steering pump is a constant value that can be calibrated, and the constant value that can be calibrated is when the turning radius of the vehicle is large when the engine is idling The torque value required to ensure the normal turning of the vehicle. 14. The device according to claim 13, wherein the fifth acquisition module comprises: The fifth determining unit is configured to determine the required torque of the air conditioner compressor according to the engine speed, and when the engine speed increases, the required torque of the air conditioner compressor increases.