CN117163000A - Start-stop control method and device for engine of hybrid off-road vehicle - Google Patents

Abstract

The application provides a method and a device for controlling the start and stop of an engine of a hybrid off-road vehicle, comprising the steps of acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and the current running state of the engine; determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state; and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction. The application controls the start and stop of the engine according to the special control mode and basic running data of the off-road vehicle, thereby judging the special purpose of the off-road vehicle and realizing the purpose of controlling the start and stop of the engine according to the special purpose of the off-road vehicle.

Description

Start-stop control method and device for engine of hybrid off-road vehicle

Technical Field

The application relates to the technical field of engine start-stop control, in particular to a method and a device for controlling the start-stop of an engine of a hybrid off-road vehicle.

Background

The engine in the hybrid electric vehicle is used as a core component of a power domain, can directly participate in driving, can also be used as an electric power source to indirectly participate in driving, and the starting and stopping of the engine are usually realized by a program according to a set control strategy. The engine start-stop logic of the existing hybrid electric vehicle on the market is simpler, the start-stop requirement of the engine is judged only according to the electric quantity of a battery or the running power of the vehicle, the starting is frequent, and the application scene is limited. The off-road vehicle has a plurality of special purposes such as forced EV mode and energy-saving mode, and the use of high-power electric equipment and the like do not have corresponding strategies for controlling the start and stop of the engine; the existing start-stop control generally only has single start-stop control of high voltage or low voltage, or needs a driver to manually switch the start-stop control. Therefore, the special purpose of the off-road vehicle cannot be judged, and the start and stop of the engine of the hybrid off-road vehicle cannot be controlled.

Therefore, there is an urgent need to provide a method and a device for controlling start and stop of an engine of a hybrid off-road vehicle, which solve the technical problem in the prior art that the start and stop of the engine cannot be controlled according to the special purpose of the off-road vehicle.

Disclosure of Invention

In view of the foregoing, it is necessary to provide a method and a device for controlling the start and stop of an engine of a hybrid off-road vehicle, which are used for solving the technical problem that the start and stop of the engine cannot be controlled according to the special purpose of the off-road vehicle in the prior art.

In one aspect, the application provides a method for controlling start and stop of an engine of a hybrid off-road vehicle, which comprises the following steps:

acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction.

In some possible implementations, the base travel data includes power battery charge, vehicle speed, time, and vertical vibration sensors;

the determining the demand state of the engine according to the basic driving data comprises the following steps:

calculating the speed and the time, and determining the acceleration of the off-road vehicle;

performing polynomial fitting on the vertical vibration sensor, the vehicle speed and the acceleration to obtain vibration and noise of the whole vehicle, and obtaining a comfort value according to the vibration and noise of the whole vehicle;

determining a low limit value and a high limit value of the battery power for starting the engine according to the comfort value;

judging the electric quantity of the power battery;

when the power battery electric quantity is lower than the low limit value, determining that the demand state is the operation demand;

when the power battery power is higher than Gao Xianzhi, determining that the demand state is no operation demand;

and when the electric quantity of the power battery is between the low limit value and the high limit value, determining the demand state at the current moment according to the demand state at the last moment.

In some possible implementations, the base travel data further includes an engine coolant temperature;

the determining the demand state of the engine according to the basic driving data further comprises:

judging the speed of the vehicle and the temperature of the engine coolant;

when the vehicle speed is lower than a vehicle speed set value, determining the demand state as no operation demand;

when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is lower than an operation low-temperature limit value, determining that the demand state is an operation demand;

when the vehicle speed is higher than the vehicle speed set value and the engine coolant temperature is higher than the operation high-temperature limit value, determining that the demand state is no operation demand;

and when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is between the running low-temperature limit value and the running high-temperature limit value, determining the demand state at the current moment according to the demand state at the last moment.

In some possible implementations, the special control modes include EV mode switch, energy saving mode switch, powertrain operating state, engine fault state signal;

the determining the start-stop control of the engine according to the demand state, the current running state and the special running state comprises the following steps:

determining a corresponding special running state according to the EV mode switch, the energy-saving mode switch, the running state of the power system and the engine fault state signal respectively;

judging whether all special running states are allowed to run or not and whether the required state is a running requirement or not;

if yes, determining the engine instruction as an engine running instruction;

if not, determining the engine instruction as an engine stop instruction;

and determining start-stop control of the engine according to the current running state and the engine instruction.

In some possible implementations, the determining start-stop control of the engine according to the current operating state and the engine command includes:

judging whether the current running state is not a running state or not under the condition that the engine instruction is the engine running instruction;

if yes, determining start-stop control of the engine;

judging whether the current running state is a running state or not under the condition that the engine instruction is the engine stop instruction;

if yes, determining that the start-stop control of the engine is stop control.

In some possible implementations, the determining start-stop control of the engine includes:

judging whether the electric quantity of the power battery is larger than an electric quantity set value or not;

if yes, under the condition that the engine meets the high-voltage starting condition, determining that the start-stop control of the engine is high-voltage starting;

determining that the start-stop control of the engine is low-pressure start in a case where the engine does not satisfy the high-pressure start condition and the low-pressure start condition is satisfied;

and under the condition that the engine does not meet the high-voltage starting condition or the low-voltage starting condition, determining that the start-stop control of the engine is unable to start, and performing fault alarm.

In some possible implementations, the determining the control instruction of the engine according to the start-stop control includes:

when the start-stop control is the high-voltage start or the low-voltage start, determining that a control instruction of the engine is high-voltage or low-voltage start of the engine; the step of starting the engine at high pressure is to determine a target rotating speed in a preset rotating speed rising curve according to the current time and control the engine according to the target rotating speed;

and when the start-stop control is the stop control, determining a control instruction of the engine as controlling the engine to stop.

In some possible implementations, after the controlling the engine according to the control instruction, the method includes:

under the condition that the control instruction is high-voltage or low-voltage to start the engine, judging whether the engine is started successfully in a preset time;

if not, stopping starting control, updating a suspension threshold value, and controlling the engine again according to the suspension threshold value;

if yes, resetting the pause threshold.

In some possible implementations, the controlling the engine again according to the suspension threshold includes:

judging whether the pause threshold reaches a pause upper limit value or not;

if yes, stopping starting control and alarming;

if not, when the stopping time of the engine reaches a stopping time threshold, the special running state, the basic running data and the current running state of the engine of the off-road vehicle are acquired again, and the engine is controlled according to the special running state, the basic running data and the running state of the engine.

On the other hand, the application also provides a start-stop control device of the engine of the hybrid off-road vehicle, which comprises:

the state acquisition module is used for acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

the mode determining module is used for determining a demand state of the engine according to the basic driving data and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

and the engine control module is used for determining a control instruction of the engine according to the start-stop control and controlling the engine according to the control instruction.

The beneficial effects of adopting the embodiment are as follows: the application provides a method for controlling the start and stop of an engine of a hybrid off-road vehicle, which comprises the steps of obtaining a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and the current running state of the engine; determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state; and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction. The application controls the start and stop of the engine according to the special control mode and basic running data of the off-road vehicle, thereby judging the special purpose of the off-road vehicle and realizing the purpose of controlling the start and stop of the engine according to the special purpose of the off-road vehicle.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the description of the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of an embodiment of a method for controlling start and stop of an engine of a hybrid off-road vehicle according to the present application;

FIG. 2 is a schematic diagram of an embodiment of a start-stop control device for a hybrid off-road vehicle engine according to the present application;

fig. 3 is a schematic structural diagram of an embodiment of an electronic device according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor systems and/or microcontroller systems.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The embodiment of the application provides a method and a device for controlling start and stop of an engine of a hybrid off-road vehicle, which are respectively described below.

Fig. 1 is a schematic flow chart of an embodiment of a method for controlling start and stop of an engine of a hybrid off-road vehicle according to the present application, where the method for controlling start and stop of an engine of a hybrid off-road vehicle shown in fig. 1 includes:

s101, acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

s102, determining a demand state of an engine according to basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

s103, determining a control instruction of the engine according to start-stop control, and controlling the engine according to the control instruction.

Compared with the prior art, the method for controlling the start and stop of the engine of the hybrid off-road vehicle provided by the embodiment of the application comprises the steps of acquiring the special running state of the special control mode of the off-road vehicle, the basic running data of the off-road vehicle in the running process and the current running state of the engine; determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state; and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction. The application controls the start and stop of the engine according to the special control mode and basic running data of the off-road vehicle, thereby judging the special purpose of the off-road vehicle and realizing the purpose of controlling the start and stop of the engine according to the special purpose of the off-road vehicle.

It should be understood that: in order to control the engine of the off-road vehicle at the current moment, the special running state of the special control mode of the off-road vehicle and the current running state of the engine obtained in the step S101 are all information of the off-road vehicle in the running process of the off-road vehicle at the current moment.

It should be noted that: to determine the base travel data, in some embodiments of the application, the base travel data includes power battery level, vehicle speed, time, and vertical vibration sensors; step S102 includes:

calculating the speed and time of the vehicle, and determining the acceleration of the off-road vehicle;

performing polynomial fitting on a vertical vibration sensor, a vehicle speed and an acceleration to obtain vibration and noise of the whole vehicle, and obtaining a comfort value according to the vibration and the noise of the whole vehicle;

determining a low limit value and a high limit value of the battery electric quantity for starting the engine according to the comfort value;

judging the electric quantity of the power battery;

when the electric quantity of the power battery is lower than the low limit value, determining the required state as running requirement;

when the power battery power is higher than Gao Xianzhi, determining that the demand state is no operation demand;

and when the electric quantity of the power battery is between the low limit value and the high limit value, determining the demand state at the current moment according to the demand state at the last moment.

In the specific embodiment of the application, the acceleration of the off-road vehicle can be calculated according to the speed of the off-road vehicle and the running time of the engine, so that polynomial fitting can be carried out on the data acquired by the vibration sensor in the vertical direction and the speed and the acceleration of the off-road vehicle, and the vibration and the noise of the whole vehicle can be calculated, and further, a comfort value can be calculated according to the weight of the vibration and the noise, wherein the smaller the comfort value is, the less the vibration and the noise are, the comfort in the vehicle is shown, the larger the comfort value is, the greater the vibration and the noise are, and the discomfort in the vehicle is shown, so that the low limit value and the high limit value of the battery electric quantity for starting the engine can be calculated according to the comfort value, the engine is not started to the greatest extent when the vibration noise is low, and the engine is started in advance when the vibration noise is high.

Further, the power battery electric quantity can be judged according to the low limit value and the high limit value, when the power battery electric quantity is lower than the low limit value, the running requirement of the engine is determined, when the power battery electric quantity is higher than Gao Xianzhi, the no-running requirement of the engine is determined, when the power battery electric quantity is between the low limit value and the high limit value, the requirement state at the current moment is determined according to the requirement state at the last moment, for example, the requirement state at the last moment is the running requirement, and the requirement state at the current moment is the running requirement.

In some embodiments of the application, the base travel data further includes engine coolant temperature; step S102 further includes:

judging the speed of the vehicle and the temperature of engine coolant;

when the vehicle speed is lower than the set value of the vehicle speed, determining the demand state as no operation demand;

when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is lower than the running low-temperature limit value, determining that the demand state is the running demand;

when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is higher than the operation high-temperature limit value, determining that the demand state is no operation demand;

when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is between the running low temperature limit value and the running high temperature limit value, the demand state at the current moment is determined according to the demand state at the last moment.

In a specific embodiment of the present application, the basic driving data may further include an engine coolant temperature, a vehicle speed set point and an operation low temperature limit may be set, when the speed of the off-road vehicle is lower than the vehicle speed set point, the engine may be determined to have no operation requirement, when the speed of the off-road vehicle is higher than the vehicle speed set point and the engine coolant temperature is lower than the operation low temperature limit, the engine may be determined to have an operation requirement, when the speed of the off-road vehicle is higher than the vehicle speed set point and the engine coolant temperature is higher than the operation high temperature limit, the engine may have no operation requirement, and when the speed of the off-road vehicle is higher than the vehicle speed set point and the engine coolant temperature is between the operation low temperature limit and the operation high temperature limit, the requirement state of the current time of the engine may be determined according to the requirement state of the previous time, for example, the requirement state of the current time is the operation requirement. The specific vehicle speed setting value and the running low temperature limit value may be set according to practical situations, and the embodiment of the present application is not limited herein.

Further, the basic driving data can also include a battery discharge power upper limit, a vehicle driving power, an electric equipment power, an engine shortest running time, an accelerator pedal signal, a forced starting switch and the like; the running power of the vehicle and the power of the electric equipment can be calculated to determine the total power; therefore, whether the total power reaches the upper limit of the battery discharge power can be judged, if so, the engine can be determined to have no operation requirement, and if not, the engine can be determined to have the operation requirement; and whether the running time of the engine exceeds the shortest running time of the engine can be judged, if so, the running requirement of the engine is determined, if not, the engine is free of the running requirement, the accelerator pedal signal and the forced starting switch are the same, the corresponding engine requirement state can be obtained, the basic running data can also comprise other judging information, and the basic running data can be set according to the actual situation.

In some embodiments of the present application, step S102 includes:

determining a corresponding special running state according to the EV mode switch, the energy-saving mode switch, the running state of the power system and the engine fault state signal respectively;

judging whether all special running states are allowed running and whether the required state is running requirement;

if yes, determining the engine instruction as an engine running instruction;

if not, determining the engine instruction as an engine stop instruction;

and determining start-stop control of the engine according to the current running state and the engine command.

In a specific embodiment of the present application, the special control modes of the off-road vehicle may include an EV mode switch, an energy-saving mode switch, a power system operation state, an engine failure state signal, and the like, whether the engine is allowed to operate may be determined according to information of the EV mode switch, whether the engine is allowed to operate may be determined according to information of the energy-saving mode switch, whether the engine is allowed to operate may be determined according to the power system operation state, whether the engine is allowed to operate may be determined according to the engine failure state signal, if both of the engine operation is allowed, whether the demand state of the engine in step S102 is an operation demand may be determined, if yes, the engine instruction may be determined as an engine operation instruction, if not, the engine instruction may be determined as an engine stop instruction, and further start-stop control of the engine may be determined.

In some embodiments of the present application, determining start-stop control of an engine based on a current operating state and an engine command includes:

judging whether the current running state is not the running state or not under the condition that the engine instruction is the engine running instruction;

if yes, determining start-stop control of the engine;

judging whether the current running state is a running state or not under the condition that the engine instruction is an engine stop instruction;

if yes, determining that the start-stop control of the engine is stop control.

In a specific embodiment of the present application, in the case where the engine instruction is an engine operation instruction, it may be determined whether the current operation state is not an operation state, and the non-operation state may include all states from the operation state to the stop state, and if the engine is not an operation state, start-stop control of the engine may be determined; then, the running state is the running state, and the engine is not controlled to perform any operation; in the case where the engine instruction is an engine stop instruction, it is also possible to determine whether the current running state is a running state, if so, it is possible to determine that the start-stop control of the engine is stop control, and if not, it is not possible to control the engine to perform any operation. The specific power setting value may be set according to practical situations, and the embodiment of the present application is not limited herein.

In some embodiments of the application, determining start-stop control of an engine includes:

judging whether the electric quantity of the power battery is larger than an electric quantity set value or not;

if yes, under the condition that the engine meets the high-voltage starting condition, determining that the start-stop control of the engine is high-voltage starting;

under the condition that the engine does not meet the high-voltage starting condition and meets the low-voltage starting condition, determining that the start-stop control of the engine is low-voltage starting;

and under the condition that the engine does not meet the high-voltage starting condition or the low-voltage starting condition, determining that the start and stop of the engine are controlled to be incapable of starting, and performing fault alarm.

In the specific embodiment of the application, whether the electric quantity of the power battery is larger than an electric quantity set value can be judged, if so, the start-stop control of the engine can be determined according to the high-voltage starting condition and the low-voltage starting condition, and if not, the engine is not controlled to perform any operation; when the state of the high-voltage motor system of the engine is normally output, the engine can be determined to meet the high-voltage starting condition, and when the voltage of the low-voltage storage battery is larger than a low-voltage set value and the low-voltage starter is normally started, the engine can be determined to meet the low-voltage starting condition, wherein the low-voltage set value can be set according to actual conditions, and the embodiment of the application is not limited herein.

In some embodiments of the present application, step S103 includes:

when the start-stop control is high-voltage start or low-voltage start, determining that the control instruction of the engine is high-voltage or low-voltage start of the engine; the step of starting the engine at high pressure is to determine a target rotating speed in a preset rotating speed rising curve according to the current time and control the engine according to the target rotating speed;

when the start-stop control is stop control, determining a control instruction of the engine as controlling the engine to stop.

In a specific embodiment of the present application, when the start-stop control is high-voltage start, the control instruction of the engine may be determined to be high-voltage start the engine, when the start-stop control is low-voltage start, the control instruction of the engine may be determined to be low-voltage start the engine, and when the start-stop control is stop control, the control instruction of the engine may be determined to be control the engine to stop, where the process of high-voltage start the engine may be to obtain the current time, a preset rotation speed rising curve may be set, a target rotation speed may be determined from the preset rotation speed rising curve according to the current time, and then the rotation speed may be output to the high-voltage motor according to the target rotation speed, thereby obtaining the current time in real time, controlling the engine according to the preset rotation speed rising curve, and also controlling the torque of the engine according to the torque upper limit value signal and the lower limit value signal, the engine enters into an operating state, and the start-up action is controlled to end, where the specific preset rotation speed rising curve may be set according to actual conditions; the low-voltage engine starting process can be to close a low-voltage starter relay, the engine enters into an operating state, and the starting action control is finished; the process of controlling the engine to stop may be to output a stop and oil supply stopping instruction, the engine state enters a stop state, and the stop control ends. When the high-voltage motor outputs the rotating speed control, the values of different P items, I items and D items can be adopted according to the calculated comfort values, different PID parameters are used for controlling corresponding different engine starting rotating speed rising curves, the comfort values are small, namely, when the vibration noise is smaller, the rotating speed rising is slower, the starting process is gentle, but the time is long, the comfort values are large, namely, when the vibration noise is larger, the rotating speed rising is faster, and the starting process is rough but the starting is rapid.

In some embodiments of the present application, after step S103, further includes:

under the condition that the control instruction is high-voltage or low-voltage to start the engine, judging whether the engine is started successfully in a preset time;

if not, suspending the starting control, updating the suspension threshold, and controlling the engine again according to the suspension threshold;

if yes, resetting the pause threshold.

In the specific embodiment of the application, when the engine is started at high pressure or low pressure, if the engine is not started successfully within a preset time, the starting control is paused, the pause threshold is updated, then the engine is controlled again according to the pause threshold, and if the engine is started successfully within the preset time, the starting and stopping control of the engine of the off-road vehicle is completed, and the pause threshold is cleared. Wherein the initial value of the pause threshold may be set to 0 and then updated after each start-up failure.

In some embodiments of the application, the engine is re-controlled according to a pause threshold, comprising:

judging whether the pause threshold reaches the pause upper limit value or not;

if yes, stopping starting control and alarming;

if not, when the stopping time of the engine reaches the stopping time threshold, the special running state, the basic running data and the current running state of the engine of the off-road vehicle are acquired again, and the engine is controlled according to the special running state, the basic running data and the running state of the engine.

In the specific embodiment of the application, when the engine is not started successfully within the preset time, judging whether the pause threshold value reaches the pause upper limit value, if not, stopping the engine, and returning to the step S101 when the pause time reaches the stop time threshold value, and carrying out the embodiment of the application again so as to enter a cycle; if the alarm is reached, starting control is stopped and an alarm is given, so that the alarm can be given to staff. The specific stop time threshold and the pause upper limit may be set according to practical situations, and embodiments of the present application are not limited herein.

The embodiment of the application can control the starting of the engine under the condition that the off-road vehicle meets the starting condition, and control the stopping of the started engine under the condition that the off-road vehicle meets the stopping condition, thereby achieving the purpose of controlling the starting and stopping of the engine according to the special purpose of the off-road vehicle.

In order to better implement the start-stop control method of the hybrid off-road vehicle engine in the embodiment of the application, correspondingly, the embodiment of the application also provides a start-stop control device of the hybrid off-road vehicle engine on the basis of the start-stop control method of the hybrid off-road vehicle engine, as shown in fig. 2, the start-stop control device of the hybrid off-road vehicle engine comprises:

a state acquisition module 201, configured to acquire a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle during running, and a current running state of the engine;

the mode determining module 202 is configured to determine a demand state of the engine according to the basic driving data, and determine start-stop control of the engine according to the demand state, the current running state and the special running state;

the engine control module 203 is configured to determine a control instruction of the engine according to the start-stop control, and control the engine according to the control instruction.

The start-stop control device for the hybrid off-road vehicle engine provided by the embodiment can realize the technical scheme described in the embodiment of the start-stop control method for the hybrid off-road vehicle engine, and the specific implementation principle of each module or unit can be referred to the corresponding content in the embodiment of the start-stop control method for the hybrid off-road vehicle engine, which is not repeated here.

As shown in fig. 3, the present application further provides an electronic device 300 accordingly. The electronic device 300 comprises a processor 301, a memory 302 and a display 303. Fig. 3 shows only some of the components of the electronic device 300, but it should be understood that not all of the illustrated components are required to be implemented and that more or fewer components may be implemented instead.

The memory 302 may be an internal storage unit of the electronic device 300 in some embodiments, such as a hard disk or memory of the electronic device 300. The memory 302 may also be an external storage device of the electronic device 300 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the electronic device 300.

Further, the memory 302 may also include both internal storage units and external storage devices of the electronic device 300. The memory 302 is used for storing application software and various types of data for installing the electronic device 300.

The processor 301 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 302, such as the hybrid off-road vehicle engine start-stop control method of the present application.

The display 303 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 303 is used for displaying information at the electronic device 300 and for displaying a visual user interface. The components 301-303 of the electronic device 300 communicate with each other via a system bus.

In some embodiments of the present application, when the processor 301 executes the hybrid off-road vehicle engine start-stop control program in the memory 302, the following steps may be implemented:

acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction.

It should be understood that: the processor 301 may perform other functions in addition to the above functions when executing the hybrid off-road vehicle engine start-stop control routine in the memory 302, see in particular the description of the corresponding method embodiments above.

Further, the type of the electronic device 300 is not particularly limited, and the electronic device 300 may be a mobile phone, a tablet computer, a personal digital assistant (personal digitalassistant, PDA), a wearable device, a laptop (laptop), or other portable electronic devices. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices that carry IOS, android, microsoft or other operating systems. The portable electronic device described above may also be other portable electronic devices, such as a laptop computer (laptop) or the like having a touch-sensitive surface, e.g. a touch panel. It should also be appreciated that in other embodiments of the application, the electronic device 300 may not be a portable electronic device, but rather a desktop computer having a touch-sensitive surface (e.g., a touch panel).

Correspondingly, the embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium is used for storing a computer readable program or instruction, and when the program or instruction is executed by a processor, the steps or functions of the hybrid off-road vehicle engine start-stop control method provided by the above method embodiments can be realized.

Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program stored in a computer readable storage medium to instruct related hardware (e.g., a processor, a controller, etc.). The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.

The method and the device for controlling the start and stop of the engine of the hybrid off-road vehicle provided by the application are described in detail, and specific examples are applied to the description of the principle and the implementation mode of the application, and the description of the examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.

Claims (10)

1. The method for controlling the start and stop of the engine of the hybrid off-road vehicle is characterized by comprising the following steps of:

acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

determining a demand state of the engine according to the basic driving data, and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

and determining a control instruction of the engine according to the start-stop control, and controlling the engine according to the control instruction.

2. The hybrid off-road vehicle engine start-stop control method of claim 1, wherein the basic travel data includes power battery level, vehicle speed, time and vertical direction vibration sensors;

the determining the demand state of the engine according to the basic driving data comprises the following steps:

calculating the speed and the time, and determining the acceleration of the off-road vehicle;

performing polynomial fitting on the vertical vibration sensor, the vehicle speed and the acceleration to obtain vibration and noise of the whole vehicle, and obtaining a comfort value according to the vibration and noise of the whole vehicle;

determining a low limit value and a high limit value of the battery power for starting the engine according to the comfort value;

judging the electric quantity of the power battery;

when the power battery electric quantity is lower than the low limit value, determining that the demand state is the operation demand;

when the power battery power is higher than Gao Xianzhi, determining that the demand state is no operation demand;

and when the electric quantity of the power battery is between the low limit value and the high limit value, determining the demand state at the current moment according to the demand state at the last moment.

3. The hybrid off-road vehicle engine start-stop control method of claim 2, wherein the base travel data further includes an engine coolant temperature;

the determining the demand state of the engine according to the basic driving data further comprises:

judging the speed of the vehicle and the temperature of the engine coolant;

when the vehicle speed is lower than a vehicle speed set value, determining the demand state as no operation demand;

when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is lower than an operation low-temperature limit value, determining that the demand state is an operation demand;

when the vehicle speed is higher than the vehicle speed set value and the engine coolant temperature is higher than the operation high-temperature limit value, determining that the demand state is no operation demand;

and when the vehicle speed is higher than the vehicle speed set value and the temperature of the engine coolant is between the running low-temperature limit value and the running high-temperature limit value, determining the demand state at the current moment according to the demand state at the last moment.

4. The hybrid off-road vehicle engine start-stop control method of claim 2, wherein the special control mode includes an EV mode switch, an energy-saving mode switch, a powertrain operating state, an engine fault state signal;

the determining the start-stop control of the engine according to the demand state, the current running state and the special running state comprises the following steps:

determining a corresponding special running state according to the EV mode switch, the energy-saving mode switch, the running state of the power system and the engine fault state signal respectively;

judging whether all special running states are allowed to run or not and whether the required state is a running requirement or not;

if yes, determining the engine instruction as an engine running instruction;

if not, determining the engine instruction as an engine stop instruction;

and determining start-stop control of the engine according to the current running state and the engine instruction.

5. The hybrid off-road vehicle engine start-stop control method according to claim 4, wherein the determining the start-stop control of the engine according to the current running state and the engine instruction comprises:

judging whether the current running state is not a running state or not under the condition that the engine instruction is the engine running instruction;

if yes, determining start-stop control of the engine;

judging whether the current running state is a running state or not under the condition that the engine instruction is the engine stop instruction;

if yes, determining that the start-stop control of the engine is stop control.

6. The hybrid off-road vehicle engine start-stop control method of claim 5, wherein the determining the start-stop control of the engine comprises:

judging whether the electric quantity of the power battery is larger than an electric quantity set value or not;

if yes, under the condition that the engine meets the high-voltage starting condition, determining that the start-stop control of the engine is high-voltage starting;

determining that the start-stop control of the engine is low-pressure start in a case where the engine does not satisfy the high-pressure start condition and the low-pressure start condition is satisfied;

and under the condition that the engine does not meet the high-voltage starting condition or the low-voltage starting condition, determining that the start-stop control of the engine is unable to start, and performing fault alarm.

7. The method of claim 6, wherein determining the control command for the engine according to the start-stop control comprises:

when the start-stop control is the high-voltage start or the low-voltage start, determining that a control instruction of the engine is high-voltage or low-voltage start of the engine; the step of starting the engine at high pressure is to determine a target rotating speed in a preset rotating speed rising curve according to the current time and control the engine according to the target rotating speed;

and when the start-stop control is the stop control, determining a control instruction of the engine as controlling the engine to stop.

8. The hybrid off-road vehicle engine start-stop control method according to claim 7, characterized by comprising, after the engine is controlled according to the control instruction:

under the condition that the control instruction is high-voltage or low-voltage to start the engine, judging whether the engine is started successfully in a preset time;

if not, stopping starting control, updating a suspension threshold value, and controlling the engine again according to the suspension threshold value;

if yes, resetting the pause threshold.

9. The hybrid off-road vehicle engine start-stop control method of claim 8, wherein the re-controlling the engine according to the suspension threshold value comprises:

judging whether the pause threshold reaches a pause upper limit value or not;

if yes, stopping starting control and alarming;

if not, when the stopping time of the engine reaches a stopping time threshold, the special running state, the basic running data and the current running state of the engine of the off-road vehicle are acquired again, and the engine is controlled according to the special running state, the basic running data and the running state of the engine.

10. A hybrid off-road vehicle engine start-stop control device, comprising:

the state acquisition module is used for acquiring a special running state of a special control mode of the off-road vehicle, basic running data of the off-road vehicle in the running process and a current running state of an engine;

the mode determining module is used for determining a demand state of the engine according to the basic driving data and determining start-stop control of the engine according to the demand state, the current running state and the special running state;

and the engine control module is used for determining a control instruction of the engine according to the start-stop control and controlling the engine according to the control instruction.