WO2020258601A1

WO2020258601A1 - Engine power output control method and apparatus

Info

Publication number: WO2020258601A1
Application number: PCT/CN2019/111862
Authority: WO
Inventors: 杨德凤
Original assignee: 奇瑞汽车股份有限公司
Priority date: 2019-06-26
Filing date: 2019-10-18
Publication date: 2020-12-30
Also published as: CN110217234A; CN110217234B

Abstract

An engine power output control method comprising: determining a selectable gear of a target vehicle according to an altitude coefficient of the target vehicle position and an intake air temperature of the target vehicle, wherein the selectable gear comprises at least one of all of forward drive gears of the target vehicle; acquiring torque loss of an air conditioning system, and determining torque required by a driver of the target vehicle according to a gear selected by the driver; and when the sum of the torque required by the driver and the torque loss of the air conditioning system is greater than a torque threshold, and when an engine speed is greater than a speed threshold, turning off the air conditioning system of the target vehicle. The method controls power output of the engine to the air conditioning system in real time, thereby improving driving comfort. The present application further relates to an engine power output control apparatus.

Description

Method and device for controlling engine power output

Technical field

The invention relates to the field of automobile electronic control, and in particular to a method and device for controlling the power output of an engine.

Background technique

The non-independent air conditioning system in the car is directly driven by the driving power of the car. This type of car only needs an engine, but because the engine mainly drives the car to travel, there is not much power reserved for the air conditioning system And the air-conditioning system generally consumes 10%-15% of the engine's power, which will directly affect the acceleration performance of the car, and then affect the comfort of the car.

In order to improve the driving comfort of automobiles, the non-independent air conditioning systems in automobiles are mostly replaced with independent air conditioning systems. The car is equipped with a special engine to drive the operation of the air conditioner, which can operate independently, will not conflict with the power part of the car, and can ensure the driving comfort of the car.

technical problem

However, a car equipped with an independent air-conditioning system needs two engines, which greatly increases fuel consumption, high engineering costs, high repair and maintenance costs, and difficulty. Moreover, the design and installation of dual engines will increase the frequency of failures.

Technical solutions

The embodiment of the present invention provides a method and device for controlling the power output of an engine, which can control the power output of the engine to the air conditioning system in real time, thereby improving the comfort of driving of the vehicle. The technical scheme of the present invention is as follows:

A control method of engine power output, the control method includes:

According to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, determine the selectable gear of the target vehicle, wherein the selectable gear includes at least one of all forward gears in the target vehicle One kind

Acquiring the torque loss of the air conditioning system, and determining the driver demand torque of the target vehicle according to the gear selected by the driver;

When the sum of the torque required by the driver and the torque loss of the air conditioning system is greater than a torque threshold, and the engine speed is greater than the speed threshold, the air conditioning system of the target vehicle is shut off.

Optionally, when the sum of the torque required by the driver and the torque loss of the air conditioning system is greater than a torque threshold, and the engine speed is greater than a speed threshold, shutting off the air conditioning system of the target vehicle includes:

Acquiring the vehicle speed of the target vehicle, and comparing the vehicle speed with a first speed threshold;

If the vehicle speed is not greater than the first speed threshold, when the sum of the driver's demand torque and the torque loss of the air conditioning system is greater than the first torque threshold, and the engine speed is greater than the first speed threshold, cut off State the air conditioning system of the target vehicle;

If the vehicle speed is greater than the first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the second torque threshold, and the engine speed is greater than the second speed threshold, the target vehicle is cut off Air conditioning system.

Optionally, the method further includes:

If the vehicle speed is not greater than the first speed threshold, when the engine speed is greater than the third speed threshold and not less than the fourth speed threshold, and the accelerator pedal opening is not less than the first opening threshold, cut off the target The air conditioning system of the vehicle.

Optionally, the method further includes:

If the vehicle speed is greater than the first speed threshold, when the engine speed is not greater than the fifth speed threshold, and the accelerator pedal opening is greater than the third opening threshold, cut off the air conditioning system of the target vehicle, or ,

When the engine speed is greater than the fifth speed threshold, and the accelerator pedal opening is greater than the fourth opening threshold, cut off the air conditioning system of the target vehicle, or,

When the accelerator pedal change rate is not less than the first change threshold, the air conditioning system of the target vehicle is cut off.

Optionally, the cutting off the air conditioning system of the target vehicle includes:

When the continuous cut-off time of the air-conditioning system is greater than the first cut-off time period, the air-conditioning system is sucked in after the continuous cut-off time reaches the first cut-off time period.

Optionally, the cutting off the air conditioning system of the target vehicle further includes:

When the continuous cut-off time of the air-conditioning system is less than the second cut-off time period, the cut-off state of the air-conditioning system is maintained, and the air-conditioning system is sucked in after the continuous cut-off time reaches the second cut-off time period.

When the continuous pull-in time of the air-conditioning system is less than the first pull-in duration, maintain the pull-in state of the air-conditioning system, and cut off the air-conditioning system after the continuous pull-in time reaches the first pull-in duration .

An embodiment of the present application also provides a control device for engine power output, and the control device includes:

The first determining module is configured to determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, wherein the selectable gear includes the target At least one of all forward gears in the vehicle;

A second determination module, configured to obtain the torque loss of the air conditioning system, and determine the driver demand torque of the target vehicle according to the selectable gear;

The cut-off module is configured to cut off the air-conditioning system of the target vehicle when the sum of the torque required by the driver and the torque loss of the air-conditioning system is greater than a torque threshold, and the engine speed is greater than the speed threshold.

Optionally, the cutting module includes:

A comparing unit configured to obtain the vehicle speed of the target vehicle, and compare the vehicle speed with the first speed threshold;

The first cut-off unit is configured to, if the vehicle speed is not greater than a first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the first torque threshold, and the engine speed is greater than the first Cut off the air conditioning system of the target vehicle when the speed threshold is reached;

The second cut-off unit is configured to, if the vehicle speed is greater than the first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the second torque threshold, and the engine speed is greater than the second speed Threshold, cut off the air conditioning system of the target vehicle,

The first torque threshold is less than the second torque threshold, and the first rotational speed threshold is less than the second rotational speed threshold.

Beneficial effect

The beneficial effects of the present invention include at least:

The driver can set the threshold of the altitude coefficient according to the geographical location of the target vehicle, and can determine the optional gear of the target vehicle according to the altitude coefficient and intake air temperature, so that on the one hand, the speed of the target vehicle can be controlled, and the other On the one hand, considering the influence of external factors on the torque required by the driver can make the power output of the finally controlled engine better meet the needs of the driver. For example, when the driver is accustomed to driving a vehicle on a plain, the threshold of the altitude coefficient can be set lower, so that when the driver is driving on a plateau, the speed of the vehicle is not easy to control. The threshold of the altitude coefficient can be changed by the driver, so that the method can be adapted to different driving situations. The driver's required torque is determined according to the gear selected by the driver, and the sum of the driver's required torque of the target vehicle and the loss torque of the air-conditioning system can be used to determine whether to cut off the air-conditioning system, so that the air-conditioning system can operate under different driving conditions. More suitable for the needs of drivers. Thresholds are set for the sum of the driver's required torque and the torque loss of the air-conditioning system and the engine speed. When the driver needs to accelerate, and the sum of the driver's required torque and the torque loss of the air-conditioning system and the engine speed exceed their corresponding When the threshold is set, the power of the engine occupied by the operation of the air conditioning system can be reduced, thereby improving the comfort of the vehicle during driving.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained from these drawings.

Fig. 1 is a flowchart of an implementation manner of a method for controlling engine power output provided by an embodiment of the application;

2 is a flowchart of another implementation manner of the method for controlling engine power output provided by an embodiment of the application;

3 is a flowchart of another implementation manner when the vehicle speed is not greater than a first speed threshold in the method for controlling engine power output provided by an embodiment of this application;

4 is a flowchart of another implementation manner of steps S304-S309 when the vehicle speed is not greater than the first speed threshold in the engine power output control method provided by the embodiment of the application;

5 is a flowchart of another implementation manner when the vehicle speed is not greater than the first speed threshold in the method for controlling the power output of the engine provided by the embodiment of the application;

6 is a flowchart of another implementation manner when the vehicle speed is greater than the first speed threshold in the method for controlling the power output of an engine provided by an embodiment of the application;

FIG. 7 is a flowchart of another implementation manner when the vehicle speed is greater than the first speed threshold in the method for controlling the power output of an engine provided by an embodiment of the application;

8 is a block diagram of a control device for engine power output provided by an embodiment of the application;

FIG. 9 is a block diagram of an implementation manner of the cut-off module in the engine power output control device provided by an embodiment of the application;

Fig. 10 is a block diagram of another implementation of the cut-off module in the engine power output control device provided by an embodiment of the application.

Embodiments of the invention

In order to make the technical solutions and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail with reference to the accompanying drawings.

The embodiment of the present application provides a method for controlling the power output of an engine. Referring to FIG. 1, the control method includes:

Step S101: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, where the selectable gear includes at least one of all forward gears in the target vehicle.

For example, in an implementation manner of the embodiment of the present application, since some people may have altitude sickness in plateau areas with higher altitudes, in order to meet the needs of drivers when driving in areas with different altitudes, the driver can Set the altitude coefficient of the location of the target vehicle. For example, when the altitude of the vehicle is below 2000 meters, the driver can choose any of all forward gears; when the target vehicle is in a geographical location with a higher altitude such as a small plateau, the driver can only choose Drive in the lower gear of the forward gears. In this way, the driving speed of the vehicle can be restricted to a certain extent, so as to prevent the driver's ability to control the speed of the vehicle from being reduced when the vehicle is at a higher altitude, which will affect the safety of the vehicle.

The difference in the intake air temperature of the target vehicle will also affect the power output of the engine. Generally, the intake air temperature of the vehicle is about 30°C. Therefore, the driver can set the intake air temperature threshold of the target vehicle to 30°C. And the driver can set multiple thresholds for the altitude coefficient. For example, when the intake air temperature of the target vehicle is greater than 30°C and the altitude of the location of the target vehicle is lower than the first threshold, the driver can select any of all forward gears. When the intake air temperature of the target vehicle is greater than 30°C and the altitude is higher than the first threshold and less than the second threshold, the driver can select any gear from 1-4 gears. When the intake air temperature of the target vehicle is greater than 30°C, and the altitude is higher than the second threshold and less than the third threshold, the driver can select any one of 1-3 gears.

Among them, the values of the first threshold, the second threshold, and the third threshold can be increased successively, and the specific values of the first threshold, the second threshold and the third threshold can be set independently by the driver, or the performance parameters of the target vehicle itself control. Moreover, with regard to the selectable gears corresponding to different altitudes or different intake temperatures, different drivers can set them according to their own needs and conditions.

Step S102: Obtain the torque loss of the air conditioning system, and determine the driver's required torque of the target vehicle according to the gear selected by the driver.

For example, in an implementation of the embodiment of the present application, the torque required by the driver is equivalent to the speed required by the driver, and the speed of the vehicle will be restricted by the gear position. Therefore, the gear position selected by the driver is in a certain range. The degree reflects the driver's demand torque.

Moreover, the power for the operation of the air conditioning system is provided by the engine, so the air conditioning system consumes a certain proportion of the power of the engine. According to the torque loss generated by the operation of the air conditioning system and the torque required by the driver, the power required by the engine can be more accurately known.

In step S103, when the sum of the driver's required torque and the torque loss of the air conditioning system is greater than the torque threshold, and the engine speed is greater than the speed threshold, the air conditioning system of the target vehicle is cut off.

For example, in an implementation of the embodiment of the present application, the manufacturer or the driver may set the torque threshold in advance for the sum of the driver's required torque and the torque loss of the air conditioning system, and set the speed threshold for the engine speed. The sum of the torque required by the driver and the torque loss of the air-conditioning system and the engine speed together reflect to a certain extent the power that the engine needs to provide. When both are greater than their corresponding thresholds, that is, the power that the engine needs to provide exceeds A certain threshold value, in order to avoid excessive engine pressure, can cut off the air conditioning system of the target vehicle, reduce the power consumed by the air conditioning system, and then reduce the overall output power of the engine, so that the engine can provide power for vehicle acceleration as much as possible, and improve vehicle travel The comfort.

In another implementation manner provided by the embodiment of the present application, referring to FIG. 2, the control method may include:

Step S201: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle.

Step S202: Obtain the torque loss of the air conditioning system, and determine the driver's required torque of the target vehicle according to the gear selected by the driver.

Step S203: Calculate the sum of the torque required by the driver and the torque loss of the air conditioning system.

Step S204: Obtain the vehicle speed and engine speed of the target vehicle.

Step S205: Determine whether the speed of the target vehicle is less than a first speed threshold. If yes, go to step S208, otherwise go to step S206.

In an implementation manner of the embodiment of the present application, the driver may set a threshold value for the vehicle speed of the target vehicle in advance. For example, the first speed threshold may be 30km/h, so that when the vehicle speed is obtained, it can be compared with the first speed threshold to know whether the target vehicle is currently driving at a low speed or a high speed.

Among them, the specific value of the first speed threshold can be set independently by the driver according to his own habits, or can be set according to the performance parameters of the target vehicle.

In step S206, it is determined whether the sum of torques is greater than the first torque threshold. If yes, go to step S207, otherwise go to step S211.

Step S207: Determine whether the engine speed is greater than the first speed threshold. If yes, go to step S210, otherwise go to step S211.

In step S208, it is determined whether the sum of torques is greater than the second torque threshold. If yes, go to step S209, otherwise go to step S211.

Step S209: Determine whether the engine speed is greater than the second speed threshold. If yes, go to step S210, otherwise go to step S211.

Step S210, cut off the air conditioning system of the target vehicle.

Step S211, end the operation.

In an implementation manner of the embodiment of the present application, the vehicle speed of the target vehicle is compared with the first speed threshold, so as to know whether the current vehicle is traveling at a low speed or a high speed. The first torque threshold may be different from the second torque threshold, and the first speed threshold may be different from the second speed threshold. In this way, setting different torque thresholds and speed thresholds for different vehicle speeds can make the control method more suitable The needs of the driver in different situations are more in line with the performance of the target vehicle itself.

Regarding the specific values of the first torque threshold, the second torque threshold, the first rotational speed threshold, and the second rotational speed threshold, this application does not make strict restrictions. The numerical values can be set independently according to the driver’s own habits or according to the target The performance parameters of the vehicle are set.

For the case where the speed of the target vehicle is not greater than the first speed threshold, the embodiment of the present application provides another implementation manner. Referring to FIG. 3, the control method may include:

Step S301: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle.

Step S302: Obtain the vehicle speed, engine speed and accelerator pedal opening of the target vehicle.

Step S303: Determine whether the speed of the target vehicle is greater than a first speed threshold. If not, step S304 is executed.

Step S304: Determine whether the engine speed of the target vehicle is greater than a third speed threshold. If yes, go to step S305, otherwise go to step S309.

Step S305: Determine whether the engine speed of the target vehicle is less than a fourth speed threshold. If yes, go to step S306, otherwise go to step S307.

Step S306: Determine whether the accelerator pedal opening of the target vehicle is greater than the first opening threshold. If yes, go to step S308, otherwise go to step S309.

Step S307: Determine whether the accelerator pedal opening of the target vehicle is greater than the second opening threshold. If yes, go to step S308, otherwise go to step S309.

Step S309, end the operation.

In this implementation of the embodiment of the present application, if the vehicle speed is not greater than the first speed threshold, it can be determined whether to cut off the air conditioning system of the target vehicle according to the engine speed and the opening degree of the accelerator pedal. The accelerator pedal opening refers to the depth produced by the driver stepping on the accelerator.

For example, in an implementation manner of the embodiment of the present application, the third rotational speed threshold, the fourth rotational speed threshold, and the first opening threshold may be 900rpm, 1000rpm, 40%, 1000rpm, 1400rpm, 50%, and 1400rpm, 2000rpm, 60%. One of them. The second opening threshold may be 70%.

In an implementation manner of the embodiment of the present application, when it is determined whether the engine speed is greater than 900 rpm, the fourth speed threshold at this time is 1000 rpm. When the engine speed is greater than 1000 rpm, the 1000 rpm at this time becomes the third speed threshold, and the corresponding fourth speed threshold at this time is 1400 rpm. When the engine speed is greater than 1400 rpm, the 1400 rpm at this time becomes the third speed threshold, and the corresponding fourth speed threshold at this time is 2000 rpm. That is, when the engine speed is greater than or equal to 900rpm and less than 1000rpm, and the accelerator pedal opening is greater than 40%, or when the engine speed is greater than or equal to 1000rpm and less than 1400rpm, and the accelerator pedal opening is greater than 50%, or when the engine speed is greater than When equal to 1400 rpm and less than 2000 rpm, and the accelerator pedal opening is greater than 60%, or when the engine speed is greater than 2000 rpm and the accelerator pedal opening is greater than 70%, cut off the air conditioning system. Or, in another implementation manner of the embodiment of the present application, referring to FIG. 4, steps S305 and S306 may specifically include the following sub-steps:

Step S3051: Determine whether the engine speed of the target vehicle is less than the first sub-value of the fourth speed threshold. If yes, go to step S3061, otherwise go to step S307.

Step S3052: Determine whether the engine speed of the target vehicle is less than the second sub-value of the fourth speed threshold. If yes, go to step S3062, otherwise go to step S307.

Step S3053: It is determined whether the engine speed of the target vehicle is less than the third sub-value of the fourth speed threshold. If yes, go to step S3063, otherwise go to step S307.

Wherein, the values of the first sub-value of the fourth rotational speed threshold, the second sub-value of the fourth rotational speed threshold, and the third sub-value of the fourth rotational speed threshold are successively increased.

Step S3061: Determine whether the accelerator pedal opening of the target vehicle is greater than the first sub-value of the first opening threshold. If yes, go to step S308, otherwise go to step S309.

Step S3062: Determine whether the accelerator pedal opening of the target vehicle is greater than the second sub-value of the first opening threshold. If yes, go to step S308, otherwise go to step S309.

Step S3063: Determine whether the accelerator pedal opening of the target vehicle is greater than the third sub-value of the first opening threshold. If yes, go to step S308, otherwise go to step S309.

Wherein, the values of the first sub-value of the first opening degree threshold, the second sub-value of the first opening degree threshold, and the third sub-value of the first opening degree threshold are successively increased.

Moreover, in other implementation manners of the embodiment of the present application, the fourth rotational speed threshold may further include more sub-values.

Of course, the setting of the third rotational speed threshold, the fourth rotational speed threshold, and the first opening threshold in the present application is not limited to the above-mentioned values. In other implementations of the embodiments of the present application, the driver can set according to his own habits or the vehicle's The performance parameters independently set specific values of the third rotational speed threshold, the fourth rotational speed threshold, the first opening threshold and the second opening threshold.

In order to improve the accuracy of the result of determining whether the air conditioning system needs to be cut off, the embodiment of the present application provides another implementation manner. Referring to FIG. 5, the control method may include:

Step S501: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle.

Step S502: Obtain the torque loss of the air conditioning system, and determine the driver's required torque according to the gear selected by the driver.

Step S503: Calculate the sum of the torque required by the driver and the torque loss of the air conditioning system.

Step S504: Obtain the vehicle speed, engine speed, and accelerator pedal opening of the target vehicle.

Wherein, step S504 may also be executed before step S501.

Step S505: Determine whether the vehicle speed is greater than a first speed threshold. If not, step S506 is executed.

In step S506, it is determined whether the sum of the torques is greater than the first torque threshold. If yes, go to step S507, otherwise go to step S508.

Step S507: Determine whether the engine speed is greater than the first speed threshold. If yes, go to step S512, otherwise go to step S508.

Step S508: Determine whether the engine speed is greater than the third speed threshold. If yes, go to step S509, otherwise go to step S513.

Step S509: Determine whether the engine speed is less than the fourth speed threshold. If yes, go to step S510, otherwise go to step S511.

Among them, the execution process of step S407 and step S408 is the same as the process of step S307 and step S308 described above, so it is not explained here.

Step S510: Determine whether the accelerator pedal opening degree is greater than the first opening degree threshold. If yes, go to step S512, otherwise go to step S513.

In step S511, it is determined whether the rate of change of the accelerator pedal opening degree is greater than the second opening degree threshold. If yes, go to step S512, otherwise go to step S513.

Step S512, cut off the air conditioning system of the target vehicle.

Step S513, ending the operation.

In an implementation manner of the embodiment of the present application, it is comprehensively determined whether the air conditioning system needs to be cut off at present through two aspects: the sum of torque and the engine speed, the engine speed and the accelerator pedal opening. This ensures the accuracy of the final judgment result.

In other implementations of the embodiment of the present application, steps S508-S511 can also be executed before step S506, that is, when the judgment result of any one of steps S508, S510, and S511 is negative, step S506 can be executed again. Whether it is necessary to cut off the air conditioning system. And when the judgment result of steps S506 and S507 is no, step S513 can be directly executed.

For the case where the speed of the target vehicle is greater than the first speed threshold, the embodiment of the present application provides another implementation manner. Referring to FIG. 6, the control method may include:

Step S601: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle.

Step S602: Obtain the vehicle speed, engine speed, and accelerator pedal opening of the target vehicle.

Step S603: Determine whether the speed of the target vehicle is less than a first speed threshold. If not, step S604 is executed.

Step S604: Determine whether the engine speed is greater than a fifth speed threshold. If yes, go to step S605, otherwise go to step S606.

Step S605: Determine whether the accelerator pedal opening degree is greater than the fourth opening degree threshold. If yes, go to step S608, otherwise go to step S607.

Step S606: Determine whether the accelerator pedal opening degree is greater than the third opening degree threshold. If yes, go to step S608, otherwise go to step S607.

In step S607, it is determined whether the rate of change of the accelerator pedal opening is less than the first change threshold. If yes, go to step S609, otherwise go to step S608.

Step S608, cut off the air conditioning system of the target vehicle.

Step S609, the operation ends.

For example, in this implementation of the embodiment of the application, the fifth rotational speed threshold may be set to 3000 rpm, the third opening threshold may be set to 80%, the fourth opening threshold may be set to 90%, and the first The change threshold is set to 5%/10ms.

That is, when the engine speed of the target vehicle is less than or equal to 3000 rpm and the accelerator pedal opening threshold is greater than 80%, or when the engine speed of the target vehicle is greater than 3000 rpm and the accelerator pedal opening is greater than 90%, or the accelerator pedal of the target vehicle When the pedal opening change rate is greater than 5%/10ms, the air conditioning system of the target vehicle is cut off.

Of course, with regard to the setting of the fifth rotational speed threshold, the third opening threshold, the fourth opening threshold, and the first change threshold, the present application is not limited to the above-mentioned values. In other implementations of the embodiments of the present application, it can be set according to driving The user’s habits or the performance parameters of the target vehicle itself are set.

Moreover, in other implementation manners of the embodiments of the present application, step S607 may also be executed before step S604. When the judgment result of step S607 is no, step S604 is executed to judge whether the air conditioning system needs to be shut off again. And when the judgment result of step S606 or step S606 is no, step S609 is executed.

In order to improve the accuracy of the result of determining whether it is necessary to cut off the air conditioning system, the embodiment of the present application provides another implementation manner. Referring to FIG. 7, the control method may include:

Step S701: Determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle.

Step S702: Obtain the torque loss of the air conditioning system, and determine the driver's required torque according to the gear selected by the driver.

Step S403: Calculate the sum of the torque required by the driver and the torque loss of the air conditioning system.

Step S704: Obtain the vehicle speed, engine speed, and accelerator pedal opening of the target vehicle.

Wherein, step S704 can also be executed before step S701.

Step S705: Determine whether the vehicle speed is greater than the first speed threshold. If yes, step S706 is executed.

In step S706, it is determined whether the sum of the torques is greater than the second torque threshold. If yes, go to step S707, otherwise go to step S708.

Step S707: Determine whether the engine speed is greater than the second speed threshold. If yes, go to step S712, otherwise go to step S708.

Step S708: Determine whether the engine speed is greater than the fifth speed threshold. If yes, go to step S709, otherwise go to step S710.

Step S709: Determine whether the accelerator pedal opening degree is greater than the fourth opening degree threshold. If yes, go to step S412, otherwise go to step S711.

Step S710: Determine whether the accelerator pedal opening degree is greater than the third opening degree threshold. If yes, go to step S712, otherwise go to step S711.

In step S711, it is determined whether the rate of change of the accelerator pedal opening degree is greater than the first change threshold. If yes, go to step S712, otherwise go to step S713.

Step S712, cut off the air conditioning system of the target vehicle.

Step S713, the operation ends.

Of course, the execution order of steps S706, S708, and S711 in this application is not limited to the above-mentioned order. In other implementations of the embodiments of this application, when the judgment result of step S706 or S707 is no, step S706 or S707 can also be executed first. S711, if the judgment result of step S711 is also no, step S708 is executed again. Alternatively, when the judgment result of step S705 is yes, step S708 or S711 may be executed first. When the judgment results of steps S706-S711 are all no, step S713 is executed. If the judgment result of any one of steps S707, S709, S710 and S711 is yes, step S712 is executed. In this way, by performing multiple comprehensive judgments in different aspects, the result of judging whether the air conditioning system needs to be cut off can be more accurate.

In an implementation manner of the embodiment of the present application, when the continuous cut-off time of the air-conditioning system is greater than the first cut-off time period, the air-conditioning system is automatically sucked in after the continuous cut-off time reaches the first cut-off time period.

For example, when the conditions for cutting off the air-conditioning system always exist, the air-conditioning system will not always be in the cut-off state. When the duration of the cut-off state reaches the first cut-off period, the air-conditioning system is automatically closed to make the air-conditioning system operate and regulate the interior of the vehicle. To avoid long-term interruption of the operation of the air-conditioning system and affect the temperature in the vehicle interior.

In other words, the first cut-off duration is the longest cut-off time of the air-conditioning system. When the longest cut-off time is reached, the air-conditioning system is automatically closed, which can better meet the needs of the driver.

In an implementation manner of the embodiment of the present application, when the continuous cut-off time of the air-conditioning system is less than the second cut-off duration, the cut-off state of the air-conditioning system is maintained, and the air-conditioning system is sucked in after the continuous cut-off time reaches the second cut-off duration.

For example, when the driver slams on the accelerator and releases it quickly when driving the target vehicle, the time for the driver to slam on the accelerator is very short, that is, the duration of meeting the conditions for cutting off the air conditioning system is very short. The system performs a cut-off operation to maintain the disconnected state of the air-conditioning system. When the disconnection time reaches the second continuous cut-off period, the air-conditioning system is automatically closed.

In an implementation of the embodiment of the present application, when the continuous pull-in time of the air-conditioning system is less than the first pull-in duration, the pull-in state of the air-conditioning system is maintained, and after the continuous pull-in time reaches the first pull-in duration, cut off Air Conditioning System.

For example, when the driver makes multiple rapid acceleration operations while driving the vehicle, and the interval between each two rapid acceleration operations is very short, less than the first pull-in duration, after the end of a cut-off state, the suction is maintained. After the closed state reaches the first pull-in time, it responds to the cut-off request.

For example, in an implementation manner of the embodiment of the present application, the first cutting time period may be 15s, the second cutting time period may be 5s, and the first pull-in time period may be 5s. Specifically, if the driver repeatedly stepped on the accelerator and released it urgently, ensure that the air conditioning system can perform 5s≤cut-off duration≤15s→switch-on duration≥5s→5s≤cut-off duration≤15s→switch-on duration≥5s →5s≤cutting time≤15s→switching time≥5s cycle. This can prevent the air-conditioning system from cutting off and closing operations too quickly to damage the operation of the air-conditioning system. It can also reduce the engine power occupied by the air-conditioning system as much as possible, improve the driving comfort of the vehicle, and ensure the appropriate indoor temperature.

Of course, the setting of the maximum disconnection time, the shortest disconnection time, and the shortest pull-in time of the air conditioning system in this application is not limited to the above-mentioned values. In other implementations of the embodiments of the present application, the first disconnection time of the air conditioning system , The specific values of the second cut-off duration and the first pull-in duration can be set according to the driver’s habits or the performance parameters of the target vehicle.

The control method can be applied to the same driver or/and different vehicles. The same driver can set different thresholds for different vehicles, and different drivers can also set different thresholds for the same target vehicle.

The embodiment of the present application also provides a control device for engine power output. Referring to FIG. 8, the control device includes:

The first determining module 801 is configured to determine the selectable gears of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, wherein the selectable gears include all forward gears in the target vehicle At least one of

The second determination module 802 is configured to obtain the torque loss of the air conditioning system, and determine the driver's required torque of the target vehicle according to the selectable gears;

The cut-off module 803 is configured to cut off the air-conditioning system of the target vehicle when the sum of the torque required by the driver and the torque loss of the air-conditioning system is greater than the torque threshold, and the engine speed is greater than the speed threshold.

Referring to Figure 9, the cut-off module may include:

The comparing unit 8031 is configured to obtain the vehicle speed of the target vehicle, and compare the vehicle speed with a first speed threshold;

The first cut-off unit 8032 is configured to cut off the target vehicle if the vehicle speed is not greater than the first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the first torque threshold, and the engine speed is greater than the first speed threshold Air conditioning system;

The second cut-off unit 8033 is configured to cut off the target vehicle when the vehicle speed is greater than the first speed threshold, when the sum of the driver's demand torque and the torque loss of the air-conditioning system is greater than the second torque threshold, and the engine speed is greater than the second speed threshold. Air Conditioning System.

In an implementation of the embodiment of the present application, the first cut-off unit 8032 may also be configured to, if the vehicle speed is not greater than the first speed threshold, when the engine speed is greater than the third speed threshold and not less than the fourth speed threshold, and When the accelerator pedal opening is not less than the first opening threshold, the air conditioning system of the target vehicle is cut off.

In an implementation of the embodiment of the present application, the first cut-off unit 8032 is further configured to cut off the air conditioning system of the target vehicle when the engine speed is greater than the fifth speed threshold and the accelerator pedal opening is greater than the second opening threshold .

Wherein, in an implementation manner of the embodiment of the present application, the third rotational speed threshold, the fourth rotational speed threshold, and the first opening threshold may be 900 rpm, 1000 rpm, 40%, 1000 rpm, 1400 rpm, 50%, 1400 At least one of rpm, 2000 rpm, and 60%, the fifth rotational speed threshold may be 2000 rpm, and the second opening degree threshold may be 70%.

In an implementation of the embodiment of the present application, the second cut-off unit 8033 is further configured to, if the vehicle speed is greater than the first speed threshold, when the engine speed is not greater than the fifth speed threshold, and the accelerator pedal opening is greater than the first speed threshold. When the threshold of three degrees of opening, cut off the air conditioning system of the target vehicle, or,

Wherein, in an implementation manner of the embodiment of the present application, the fifth rotational speed threshold can be set to 3000 rpm, the third opening threshold can be set to 80%, the fourth opening threshold can be set to 90%, and the first change threshold Can be set to 5%/10ms.

In an implementation manner of the embodiment of the present application, referring to FIG. 10, the cutting module 803 may further include:

The pull-in unit 8034 is configured to pull in the air-conditioning system when the continuous cut-off time of the air-conditioning system is greater than the first cut-off time period, after the continuous cut-off time reaches the first cut-off time period, and is also configured to pull in the air-conditioning system when the air-conditioning system is cut off continuously. When the time is less than the second cut-off time period, the air-conditioning system is maintained in the cut-off state, and after the continuous cut-off time reaches the second cut-off time period, the air-conditioning system is sucked in.

In an implementation of the embodiment of the present application, the cut-off module 803 is further configured to maintain the suction state of the air conditioning system when the continuous pull-in time of the air-conditioning system is not greater than the first pull-in time. After reaching the first pull-in duration, the air conditioning system is cut off.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific embodiments of the present invention are limited to these descriptions. For those of ordinary skill in the technical field of the present invention, other implementation manners obtained without departing from the technical solution of the present invention should all be included in the protection scope of the present invention.

Claims

A method for controlling power output of an engine, characterized in that the method includes:

According to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, determine the selectable gear of the target vehicle, wherein the selectable gear includes at least one of all forward gears in the target vehicle One kind

Acquiring the torque loss of the air conditioning system, and determining the driver demand torque of the target vehicle according to the gear selected by the driver;

When the sum of the torque required by the driver and the torque loss of the air conditioning system is greater than a torque threshold, and the engine speed is greater than the speed threshold, the air conditioning system of the target vehicle is shut off.
The method for controlling the power output of an engine according to claim 1, wherein the sum of the torque required by the driver and the torque loss of the air conditioning system is greater than a torque threshold, and the engine speed is greater than the speed threshold , Cutting off the air conditioning system of the target vehicle, including:

Acquiring the vehicle speed of the target vehicle, and comparing the vehicle speed with a first speed threshold;

If the vehicle speed is not greater than the first speed threshold, when the sum of the driver's demand torque and the torque loss of the air conditioning system is greater than the first torque threshold, and the engine speed is greater than the first speed threshold, cut off State the air conditioning system of the target vehicle;

If the vehicle speed is greater than the first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the second torque threshold, and the engine speed is greater than the second speed threshold, the target vehicle is cut off Air conditioning system.
The method for controlling the power output of an engine according to claim 2, wherein the method further comprises:

If the vehicle speed is not greater than the first speed threshold, when the engine speed is greater than the third speed threshold and not less than the fourth speed threshold, and the accelerator pedal opening is not less than the first opening threshold, cut off the target The air conditioning system of the vehicle.
The method for controlling the power output of an engine according to claim 3, wherein the method further comprises:

If the vehicle speed is not greater than the first speed threshold, when the engine speed is greater than the fourth speed threshold, and the accelerator pedal opening is greater than the second opening threshold, the air conditioning system of the target vehicle is cut off.
The method for controlling the power output of an engine according to any one of claims 2-4, wherein the method further comprises:

If the vehicle speed is greater than the first speed threshold, when the engine speed is not greater than the fifth speed threshold, and the accelerator pedal opening is greater than the third opening threshold, cut off the air conditioning system of the target vehicle, or ,

When the engine speed is greater than the fifth speed threshold, and the accelerator pedal opening is greater than the fourth opening threshold, cut off the air conditioning system of the target vehicle, or,

When the accelerator pedal change rate is not less than the first change threshold, the air conditioning system of the target vehicle is cut off.
The method for controlling the power output of an engine according to claim 5, wherein the cutting off the air conditioning system of the target vehicle comprises:

When the continuous cut-off time of the air-conditioning system is greater than the first cut-off time period, the air-conditioning system is sucked in after the continuous cut-off time reaches the first cut-off time period.
The method for controlling the power output of an engine according to claim 6, wherein the cutting off the air conditioning system of the target vehicle further comprises:

When the continuous cut-off time of the air-conditioning system is less than the second cut-off time period, the cut-off state of the air-conditioning system is maintained, and the air-conditioning system is sucked in after the continuous cut-off time reaches the second cut-off time period.
The method for controlling the power output of an engine according to claim 7, wherein said cutting off the air conditioning system of the target vehicle further comprises:

When the continuous pull-in time of the air-conditioning system is less than the first pull-in duration, maintain the pull-in state of the air-conditioning system, and cut off the air-conditioning system after the continuous pull-in time reaches the first pull-in duration .
A control device for engine power output, characterized in that the device comprises:

The first determining module is configured to determine the selectable gear of the target vehicle according to the altitude coefficient of the location of the target vehicle and the intake air temperature of the target vehicle, wherein the selectable gear includes the target At least one of all forward gears in the vehicle;

A second determination module, configured to obtain the torque loss of the air conditioning system, and determine the driver demand torque of the target vehicle according to the selectable gear;

The cut-off module is configured to cut off the air-conditioning system of the target vehicle when the sum of the torque required by the driver and the torque loss of the air-conditioning system is greater than a torque threshold, and the engine speed is greater than the speed threshold.
The control device for engine power output according to claim 9, wherein the cut-off module comprises:

A comparing unit configured to obtain the vehicle speed of the target vehicle, and compare the vehicle speed with the first speed threshold;

The first cut-off unit is configured to, if the vehicle speed is not greater than a first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the first torque threshold, and the engine speed is greater than the first Cut off the air conditioning system of the target vehicle when the speed threshold is reached;

The second cut-off unit is configured to, if the vehicle speed is greater than the first speed threshold, when the sum of the driver demand torque and the torque loss of the air conditioning system is greater than the second torque threshold, and the engine speed is greater than the second speed When the threshold is reached, the air conditioning system of the target vehicle is cut off.