CN111845699A

CN111845699A - Vehicle control method and device

Info

Publication number: CN111845699A
Application number: CN201910277441.9A
Authority: CN
Inventors: 范超雄; 许少华; 郭小雷; 王超; 贾晔松; 张炎; 李洪起; 安广林; 李涛; 李汝习; 苑国青; 张海彬; 曹博成
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-10-30
Anticipated expiration: 2039-04-08
Also published as: CN111845699B

Abstract

The invention discloses a control method and a control device for a vehicle, wherein the method comprises the following steps: identifying a driving state of the vehicle in a pure electric mode at present; obtaining a current oil temperature of a transmission in the vehicle; and carrying out gear shifting control on the vehicle according to the current oil temperature. The method can ensure that the vehicle can smoothly shift on the premise of not increasing the energy consumption and the mass of the whole vehicle, and can not bring the NVH problem of the vehicle.

Description

Vehicle control method and device

Technical Field

The invention relates to the technical field of vehicles, in particular to a vehicle control method and device.

Background

A plug-in hybrid electric vehicle (PHEV) generally adopts a P0+ P4 hybrid architecture, i.e., a front axle carrying an engine and a wet Dual clutch automatic transmission (DCT), and a rear axle carrying a motor and a reducer. The vehicle type can support pure electric driving and can also support fuel oil driving; when the vehicle runs in the pure electric mode, in order to ensure smoothness and nature of power connection, the DCT is required to preselect a proper gear in the pure electric mode. When the pure electric vehicle runs, an engine in the vehicle is in a stop state, and no hydraulic source provides hydraulic power for the transmission, so an electronic oil pump needs to be designed to provide oil pressure required by gear shifting, lubrication and heat dissipation. Because the viscosity of the oil in the transmission is high at low temperature and is very low at high temperature, the electronic oil pump cannot provide enough gear shifting oil pressure and flow in the gear shifting process of the vehicle, and the gear shifting of the vehicle is difficult.

In the related technology, usually, a high-power electronic oil pump is selected to improve the flow and pressure of the electronic oil pump, improve the low-temperature gear shifting oil pressure and flow, and make up the problem of insufficient flow caused by dilution and leakage of high-temperature oil, but simultaneously, because of the improvement of the power and the rotating speed of the electronic oil pump, the energy consumption and the quality of the whole vehicle are inevitably increased, which is contrary to the original purpose of energy conservation and emission reduction of new energy vehicle types, and therefore, the problems of Noise, Vibration and Harshness (NVH for short) of the vehicle are brought.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, a first object of the present invention is to provide a control method for a vehicle, which can ensure smooth shifting of the vehicle without increasing the energy consumption and the mass of the entire vehicle, and does not cause the NVH problem of the vehicle.

A second object of the invention is to propose a control method of a vehicle.

A third object of the present invention is to provide a control apparatus for a vehicle.

A fourth object of the present invention is to provide a control device for a vehicle.

A fifth object of the invention is to propose a vehicle.

A sixth object of the invention is to propose a vehicle.

A seventh object of the present invention is to provide an electronic apparatus.

An eighth object of the present invention is to provide an electronic apparatus.

A ninth object of the present invention is to propose a computer-readable storage medium.

A tenth object of the present invention is to propose a computer-readable storage medium.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a control method for a vehicle, including:

identifying a driving state of the vehicle in a pure electric mode at present;

obtaining a current oil temperature of a transmission in the vehicle;

and carrying out gear shifting control on the vehicle according to the current oil temperature.

According to an embodiment of the present invention, the vehicle is a hybrid vehicle, and the shift control of the vehicle according to the current oil temperature includes:

detecting and determining that the current oil temperature is in a first temperature interval;

controlling the vehicle to shift according to the received gear shifting request instruction;

detecting and determining that the vehicle failed to shift;

and controlling an engine in the vehicle to start so as to drive a mechanical oil pump in the vehicle to work and complete gear shifting.

According to one embodiment of the invention, the controlling after the engine in the vehicle is started comprises:

detecting and determining that the vehicle shift was successful;

detecting and determining that the current vehicle speed of the vehicle is greater than a first vehicle speed threshold value, and/or the current oil temperature is greater than a preset oil temperature threshold value, and/or the running time of the engine reaches a preset time length;

and controlling the engine to stop.

According to one embodiment of the invention, the shift control of the vehicle according to the current oil temperature comprises:

detecting and determining that the current oil temperature is in a second temperature interval;

detecting and determining that the current vehicle speed of the vehicle is less than a second vehicle speed threshold;

and before the gear lever position of the vehicle is switched to the parking gear, keeping the pre-selected gear of the vehicle unchanged.

According to one embodiment of the invention, the preselected gear for each gear lever position in the vehicle is the same.

According to the control method of the vehicle, when the current running state of the vehicle in the pure electric mode is identified, the current oil temperature of a transmission in the vehicle is obtained; furthermore, according to the current oil temperature, a corresponding gear shifting strategy is determined, then the corresponding gear shifting strategy is executed, and gear shifting control is carried out on the vehicle.

An embodiment of a second aspect of the present invention provides a control method for a vehicle, including:

identifying a driving state of the vehicle in a pure electric mode at present;

obtaining a current oil temperature of a transmission in the vehicle and a current oil pressure of the transmission;

and controlling the rotating speed of an electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure.

According to an embodiment of the present invention, the controlling the rotation speed of the electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure includes:

detecting and determining the oil pressure range of the current oil pressure;

determining a target rotating speed of the electronic oil pump according to the current oil temperature and the oil pressure range;

and adjusting the current rotating speed of the electronic oil pump to the target rotating speed.

According to an embodiment of the present invention, further comprising:

and if the oil pressure range in which the current oil pressure is located is a first oil pressure range and the current oil temperature is greater than a preset temperature threshold value, detecting and determining that the current vehicle speed is less than a third preset vehicle speed threshold value, and correcting the target rotating speed.

According to the control method of the vehicle, when the current running state of the vehicle in the pure electric mode is identified, the current oil temperature and the current oil pressure of a transmission in the vehicle are obtained; furthermore, according to the current oil temperature and the current oil pressure, the corresponding rotating speed of the electronic oil pump in the vehicle is determined, the rotating speed of the electronic oil pump is controlled, the electronic oil pump can be guaranteed to operate stably, and the NVH performance of the vehicle is improved while the vehicle is guaranteed to be smoothly shifted.

An embodiment of a third aspect of the invention provides a control apparatus for a vehicle, the apparatus including:

the first identification module is used for identifying the current running state of the vehicle in the pure electric mode;

the first acquisition module is used for acquiring the current oil temperature of a transmission in the vehicle;

and the first control module is used for carrying out gear shifting control on the vehicle according to the current oil temperature.

According to an embodiment of the invention, the vehicle is a hybrid vehicle, and the first control module is further configured to:

detecting and determining that the vehicle failed to shift;

According to an embodiment of the invention, the first control module is further configured to:

detecting and determining that the vehicle shift was successful;

And controlling the engine to stop.

According to an embodiment of the present invention, the first obtaining module is further configured to:

According to the control device of the vehicle, when the first identification module identifies that the vehicle is in the pure electric mode running state at present, the first acquisition module acquires the current oil temperature of a transmission in the vehicle; furthermore, the first control module determines a corresponding gear shifting strategy according to the current oil temperature, then executes the corresponding gear shifting strategy, and performs gear shifting control on the vehicle, and the formulated gear shifting strategy is related to the oil temperature of the electronic oil pump, so that the gear shifting success rate can be improved, the vehicle can smoothly complete gear shifting when the high-power electronic oil pump is not selected, smooth gear shifting of the vehicle is ensured on the premise of not increasing the energy consumption and the quality of the whole vehicle, and the NVH problem of the vehicle is not brought.

A fourth aspect embodiment of the present invention provides a control apparatus for a vehicle, the apparatus including:

the second identification module is used for identifying the current running state of the vehicle in the pure electric mode;

a second obtaining module for obtaining a current oil temperature of a transmission in the vehicle and a current oil pressure of the transmission;

and the second control module is used for controlling the rotating speed of the electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure.

According to an embodiment of the invention, the second control module is further configured to:

detecting and determining the oil pressure range of the current oil pressure;

According to the control device of the vehicle, provided by the embodiment of the invention, when the second identification module identifies that the vehicle is in the pure electric mode running state at present, the second acquisition module acquires the current oil temperature and the current oil pressure of a transmission in the vehicle; furthermore, the second control module determines the corresponding rotating speed of the electronic oil pump according to the current oil temperature and the current oil pressure, so that the rotating speed of the electronic oil pump is controlled, the electronic oil pump can be guaranteed to operate stably, and the NVH performance of the vehicle is improved while the vehicle is guaranteed to shift gears smoothly.

An embodiment of a fifth aspect of the invention provides a vehicle comprising: a control apparatus of a vehicle as in the third aspect.

An embodiment of a sixth aspect of the invention provides a vehicle comprising: the control device of a vehicle as in the fourth aspect.

A seventh embodiment of the present invention provides an electronic device, including a memory, a processor;

wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing the control method of the vehicle in the first aspect.

An eighth aspect of the present invention provides an electronic device, including a memory, a processor;

wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing the control method of the vehicle in the second aspect.

A ninth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the control method of the vehicle in the first aspect.

A tenth aspect embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the control method of the vehicle in the second aspect.

Drawings

FIG. 1 is a schematic flow chart diagram of a control method for a vehicle in accordance with one embodiment of the present disclosure;

FIG. 2 is a flowchart illustrating steps of a shift control for a vehicle in a control method for a vehicle according to an embodiment of the disclosure;

FIG. 3 is a flowchart illustrating steps of a shift control for a vehicle in a control method for a vehicle according to another embodiment of the disclosure;

FIG. 4 is a flowchart illustrating steps of a shift control for a vehicle in a control method for a vehicle according to another embodiment of the disclosure;

FIG. 5 is a schematic flow chart diagram of a control method of a vehicle according to another embodiment of the present disclosure;

FIG. 6 is a flowchart illustrating steps of controlling the rotational speed of an electronic oil pump in a control method of a vehicle according to another embodiment of the disclosure;

FIG. 7 is a schematic configuration diagram of a control apparatus of a vehicle according to an embodiment of the present disclosure;

fig. 8 is a schematic configuration diagram of a control apparatus of a vehicle of another embodiment of the present disclosure;

FIG. 9 is a schematic illustration of a vehicle according to an embodiment of the present disclosure;

FIG. 10 is a schematic illustration of a vehicle according to another embodiment of the present disclosure;

FIG. 11 is a schematic diagram of an electronic device according to an embodiment of the disclosure;

Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A control method and apparatus of a vehicle according to an embodiment of the invention are described below with reference to the drawings.

Example one

Fig. 1 is a flowchart illustrating a control method of a vehicle according to an embodiment of the disclosure. As shown in fig. 1, the method specifically includes the following steps:

and S11, identifying the current running state of the vehicle in the pure electric mode.

It should be noted that the vehicle in the present embodiment includes a hybrid vehicle and a pure electric vehicle.

Specifically, when the vehicle is a hybrid vehicle, in general, when the vehicle meets the conditions of the pure electric mode running, the vehicle will automatically enter the pure electric mode running, and the conditions of the vehicle entering the pure electric mode running state are as follows: the current environment temperature is higher than the preset temperature and the electric capacity of the power battery is higher than the preset electric capacity. Therefore, in the present embodiment, the current ambient temperature may be detected by a temperature sensor in the vehicle, and the electric capacity of the power battery is acquired by a battery management system in the vehicle; further, determining whether the current environment temperature is greater than a preset temperature, and determining whether the current electric capacity of the power battery is greater than a preset electric capacity; and if the current environment temperature is higher than the preset temperature and the current electric capacity of the power battery is higher than the preset electric capacity, determining that the vehicle is in the pure electric mode running state currently.

When the vehicle is a pure electric vehicle, the vehicle can be directly judged to be in a running state of a pure electric mode.

And S12, acquiring the current oil temperature of the transmission in the vehicle.

Specifically, the current oil temperature of the transmission may be detected by a temperature sensor on the transmission.

And S13, performing gear shifting control on the vehicle according to the current oil temperature.

The oil in the transmission changes its own characteristics with the change of the oil temperature. For example, the viscosity of the oil is high at low temperatures and low and high dilution at high temperatures. In the embodiment, the oil temperature of the transmission is divided into different temperature intervals, and different gear shifting strategies are set for the different temperature intervals. Specifically, after the current oil temperature of the transmission is obtained, the corresponding gear shifting strategy can be determined according to the temperature interval where the current oil temperature is located, then the corresponding gear shifting strategy is executed, gear shifting control is conducted on the vehicle, and the formulated gear shifting strategy is related to the oil temperature of the transmission, so that the gear shifting success rate can be improved.

In summary, according to the control method of the vehicle provided in the embodiment of the present invention, when it is identified that the vehicle is currently in the pure electric mode driving state, the current oil temperature of the transmission in the vehicle is obtained; furthermore, according to the current oil temperature, a corresponding gear shifting strategy is determined, then the corresponding gear shifting strategy is executed, gear shifting control is carried out on the vehicle, and the formulated gear shifting strategy is related to the oil temperature of the transmission, so that the gear shifting success rate can be improved, the vehicle can also smoothly complete gear shifting when a high-power electronic oil pump is not selected, the smooth gear shifting of the vehicle is ensured, and the NVH problem of the vehicle is not brought.

In the embodiment, the oil temperature of the transmission is divided into two temperature intervals, wherein the first temperature interval is a non-low temperature condition, that is, the oil pressure of the transmission is less influenced by the viscosity of the oil in the temperature interval; and the second temperature range is a low temperature condition in which the oil pressure of the transmission is greatly affected by the viscosity of the oil. Next, the shift control of the vehicle will be described when the current oil temperature is in the first temperature range and the second temperature range.

When current oil temperature was in first temperature interval, the fluid that receives in the influence derailleur of temperature can become the dilution to there is the problem that fluid leakage quantity increases, because the power and the rotational speed of the electronic oil pump of not increasing in this embodiment, this just makes in the process of shifting, and the oil pressure that can appear the electronic oil pump and the flow is not enough, and leads to shifting the problem of failure. Therefore, the shift control of the vehicle may be performed by the following steps, wherein the vehicle at this time is a hybrid vehicle, as shown in fig. 2, the steps including:

s1311, detecting and determining that the current oil temperature is in a first temperature interval.

The first temperature range may be set according to actual conditions, and is not limited herein. In this example, the first temperature interval was determined by experimental analysis to be in the range of 30 ℃ to 120 ℃.

And if the current oil temperature of the transmission is obtained, whether the current oil temperature is in the first temperature interval or not can be judged.

And S1312, controlling the vehicle to shift according to the received gear shifting request command.

Specifically, the current vehicle speed may be determined based on a speed sensor in the vehicle, and further, whether to issue a command for a shift request may be determined based on the current vehicle speed, wherein the command for a shift request is issued when the vehicle speed is above or below a certain preset value. And when an automatic gearbox controller in the vehicle receives the command of the vehicle gear shifting request, the vehicle is controlled to shift gears.

For example, the pre-selection strategy in the vehicle is a gear pre-selection strategy with vehicle speed, i.e. corresponding gears are pre-engaged with increasing or decreasing vehicle speed, such as 0kph pre-engaged 1 and 2, 10kph pre-engaged N and 2, 20kph pre-engaged 2 and 3, 35kph pre-engaged 3 and 4, 50kph pre-engaged 4 and 5, 65kph pre-engaged 5 and 6. During acceleration, when the vehicle speed exceeds 65kph, the vehicle will issue a shift request command (upshift). And after the automatic gearbox controller receives a gear shifting request instruction, controlling the automatic gearbox controller to perform gear shifting operation.

S1313, vehicle gear shifting failure is detected and determined.

If the transmission controller controls the shift module to not complete the shift, a vehicle shift failure may be determined. Specifically, the transmission controller detects that the actual gear is not consistent with the target gear, and may determine that the vehicle has failed to shift. For example, when the vehicle is running, the target gear corresponding to the current vehicle speed is 5 th gear, but the actual gear of the current vehicle is 4 th gear, it can be determined that the vehicle has failed to shift. Considering that there is a sporadic shift failure, for the accuracy of detection, in this embodiment, when the number of shift failures of the vehicle reaches a preset number, the shift failure of the vehicle is determined, where the preset number may be set according to actual conditions.

And S1314, controlling an engine in the vehicle to start so as to drive a mechanical oil pump in the vehicle to work and finish gear shifting.

Specifically, when the failure of gear shifting of the vehicle is detected, the automatic transmission controller actively requests to start the engine, so that the engine in the vehicle is started, the synchronous speed difference of the synchronizer is reduced after the engine runs, and meanwhile, the pushing force of the shifting fork is improved along with the intervention of the mechanical oil pump, and the gear is engaged or disengaged (namely, gear shifting is completed). In addition, when the vehicle fails to shift gears, long-time friction of a synchronizer in the gear shifting synchronous system is easily caused, and then the problem that the synchronizer is burnt out and fails due to overheating of a friction pair is caused.

And when the gear shifting is successful, the engine can be controlled to stop, so that the vehicle is recovered to a pure electric mode running state. Because the gear shifting is successful within a short time after the engine is started, the engine is immediately shut down after the gear shifting is successful, and the phenomenon that the engine is started within a short time and is shut down occurs. This phenomenon, if it occurs frequently, may cause the driver to cause the vehicle to have an abnormal failure, which affects the driving experience. Therefore, in the present embodiment, the above problem is solved by extending the engine operating time, specifically, as shown in fig. 3, after the engine is started, the method further includes the following steps:

S1315, vehicle gear shifting is detected and determined to be successful.

Whether the vehicle has shifted successfully may be detected by a shift module in an automatic transmission controller. Specifically, see the description in step S1313, which is not described herein again.

S1316, detecting and determining that the current vehicle speed of the vehicle is greater than a first vehicle speed threshold value, and/or the current oil temperature is greater than a preset oil temperature threshold value, and/or the running time of the engine reaches a preset time length.

Specifically, the current vehicle speed of the vehicle may be detected by a speed sensor in the vehicle, and the current vehicle speed is compared with a first vehicle speed threshold calibrated in advance, and when the current vehicle speed is greater than the first vehicle speed threshold, step S1317 may be executed.

In addition, the current oil temperature of the transmission may be compared with a preset oil temperature threshold, and if the current oil temperature is greater than the preset oil temperature threshold, step S1317 is performed.

Considering that the vehicle speed of the vehicle may be greater than the first vehicle speed threshold value when the vehicle is shifted, or the current oil temperature of the vehicle may be greater than the preset oil temperature threshold value, in this case, the engine may start and stop for a short time. In order to avoid the above situation, a preset time period of the engine operation time may be set, and when the engine operation time reaches the preset time period, step S1317 is performed.

And S1317, controlling the engine to stop.

Specifically, the engine is controlled to stop, and the vehicle is recovered to the pure electric mode running state.

When the current oil temperature is in the second temperature interval, the oil in the transmission is affected by the temperature and becomes viscous, and because the power and the rotating speed of the electronic oil pump are not increased in the embodiment, the electronic oil pump cannot provide sufficient oil pressure required for lubrication and gear shifting in the gear shifting process, so that the gear shifting force applied to the synchronizer cannot overcome the dragging torque of the clutch at low temperature and low vehicle speed, the synchronizer is difficult to synchronize, and the gear shifting failure problem occurs in the gear lever position switching process of the vehicle. In addition, even if the shift lever position is successfully switched, a large gear engagement sound is generated, which affects the driving experience. Therefore, the vehicle may be subjected to gear shifting control by the following steps, wherein the vehicle at this time may be a hybrid vehicle or a pure electric vehicle, as shown in fig. 4, and the steps include:

and S1321, detecting and determining that the current oil temperature is in a second temperature interval.

The second temperature interval may be set according to actual conditions, and is not limited herein. In this example, the first temperature interval was determined by experimental analysis to be in the range of-10 ℃ to 30 ℃.

And acquiring the current oil temperature of the transmission, and judging whether the current oil temperature is in a first temperature interval through the controller.

S1322, detecting and determining that the current vehicle speed of the vehicle is less than the second vehicle speed threshold value.

Specifically, the current vehicle speed may be determined by a speed sensor in the vehicle, and further, the current vehicle speed may be compared to a second vehicle speed threshold. If the current vehicle speed is less than the second vehicle speed threshold, step S1323 is performed.

It should be noted that the second vehicle speed threshold may be determined according to actual conditions, and in this embodiment, the second vehicle speed threshold is determined to be 10kph through experiments. When the vehicle speed is greater than 10kph (i.e., the second vehicle speed threshold), the vehicle basically does not need to switch the shift lever position, and the gear engagement sound generated when the shift lever position is switched is also drowned out due to the influence of external noise inside and outside the vehicle, so that the above-described problem does not occur when the vehicle speed is greater than 10kph (i.e., the second vehicle speed threshold).

And S1323, before the gear lever position of the vehicle is switched to the parking gear, keeping the pre-selected gear of the vehicle unchanged.

Specifically, if the current oil temperature is determined to be in the second temperature range, and the current vehicle speed is lower than the second vehicle speed threshold value, the vehicle is controlled to keep the pre-selected gear of the vehicle unchanged before the gear position is switched to the parking gear in the gear lever position switching process, so that the pre-selected gear of the vehicle is not changed in the gear lever position switching process, the response of a transmission in the vehicle is improved, and the gear shifting failure or the occurrence of gear meshing sound and other conditions in the gear lever position switching process is avoided.

As a possible realization, each gear lever position in the vehicle can be assigned the same preselected gear, i.e. the preselected gear for each gear lever position in the vehicle is the same. However, in the construction of the transmission, the problem often arises that the forward and reverse gears are coaxial, and in this case the two lever positions do not share the same pre-selected gear, and therefore one of them can be selected to be identical to the pre-selected gear of the other lever positions. In the following description, taking a hybrid vehicle as an example, as shown in table one, in both modes, when the shift lever position is P, R, N, the pre-selected shift is R/2; when the shift lever is at position D, the pre-selected shift is 1/2.

Watch 1

In some embodiments, it is considered that in the pure electric mode, the vehicle is mainly provided with oil pressure required by gear shifting synchronization by the electronic oil pump, and in the gear shifting synchronization process, if the oil temperature in the transmission is too low, the electronic oil pump cannot provide sufficient oil pressure required for lubrication and gear shifting under the characteristic that the oil has low temperature and high viscosity, so that the gear shifting force applied to a synchronizer in the vehicle cannot overcome the dragging torque of a clutch in the vehicle at low temperature, the synchronizer is difficult to synchronize, and the gear shifting success rate and the NVH performance of the whole vehicle cannot be guaranteed; meanwhile, the electronic pump can accumulate oil pressure in a gear shifting oil circuit when gear shifting is performed, and the risk of burning of the controller caused by rotation blockage exists. If the oil temperature in the derailleur is too high, then can lead to fluid to dilute, and then there is the problem that the fluid lets out the leakage rate increase, and then brings the difficulty for the oil pressure control of electronic oil pump, in addition, still has the risk of damaging automatic transmission control unit hardware system. Therefore, in the embodiment, whether the vehicle enters the pure electric mode running state or not can be controlled through the current oil temperature of the transmission.

Specifically, if the current oil temperature of the transmission is lower than a lower limit value of a preset temperature interval or higher than an upper limit value of the preset temperature interval, the vehicle is prohibited from entering the pure electric mode for driving. When the current oil temperature is lower than the lower limit value of the preset temperature interval, the engine is started to drive a mechanical oil pump in the vehicle to work and complete gear shifting; when the current oil temperature is higher than the upper limit value of the preset temperature interval, the engine is started to drive the cooling fan to work, and therefore the oil temperature of the transmission is reduced. In the embodiment, the preset temperature range of the oil temperature in the transmission is-10 ℃ to 120 ℃.

Example two

Fig. 5 is a flowchart illustrating a control method of a vehicle according to another embodiment of the disclosure. As shown in fig. 5, the method specifically includes the following steps:

and S51, identifying the current running state of the vehicle in the pure electric mode.

Specifically, the details are described in the first embodiment, and are not repeated herein.

S52, acquiring the current oil temperature of the transmission and the current oil pressure of the transmission in the vehicle.

Specifically, the current oil temperature of the transmission may be acquired by a temperature sensor in the vehicle; the current oil pressure of the transmission is acquired through the pressure sensor.

And S53, controlling the rotation speed of the electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure.

The target rotating speed of the electronic oil pump can be determined by acquiring the current oil temperature and the current oil pressure, and further, the current rotating speed of the electronic oil pump is adjusted to the target rotating speed, so that the rotating speed of the electronic oil pump is controlled.

As a possible implementation manner, the control of the rotation speed of the electronic oil pump may be implemented by the following steps, specifically, as shown in fig. 6, the steps include:

and S531, detecting and determining the oil pressure range of the current oil pressure.

Specifically, the acquired current oil pressure is compared with a preset oil pressure range to determine the oil pressure range in which the current oil pressure is located.

It should be understood that, in consideration of the phenomenon that measurement errors exist in the process of acquiring the oil pressure, the oil pressure range in the embodiment may be an interval or a single value, and may be determined according to actual conditions, and is not limited herein. For example, when the measurement accuracy of the measured oil pressure is high, the oil pressure range may be set to a specific value; and when the measurement accuracy is low, the range can be set as an interval range.

And S532, determining the target rotating speed of the electronic oil pump according to the current oil temperature and the oil pressure range.

Specifically, the target rotating speed of the electronic oil pump can be determined according to the mapping relationship among the oil temperature, the oil pressure range and the target rotating speed by acquiring the current oil temperature of the transmission and the oil pressure range where the current oil pressure is located.

For example, as shown in table two, the table is a mapping relationship table between the oil temperature, the oil pressure range and the target rotation speed, and it can be seen from the table that when the oil temperature is 70 ℃, the oil pressure is 5bar, the target rotation speed is 1820 r/min; when the oil temperature is 70 ℃ and the oil pressure is 9bar, the target rotating speed is 3250 r/min. In the table, an oil pressure of 5bar indicates an oil pressure of the transmission when the vehicle is not shifted, and an oil pressure of 9bar indicates an oil pressure of the transmission when the vehicle is shifted.

Watch two

And S533, adjusting the current rotating speed of the electronic oil pump to the target rotating speed.

Specifically, the current rotation speed of the electronic oil pump can be adjusted to the target rotation speed by acquiring the target rotation speed.

Further, along with the oil temperature of derailleur rises, the fluid dilution increases, and at this moment, the oil circuit leaks the leakage quantity and increases, in order to satisfy the requirement of oil circuit oil pressure, needs to promote the rotational speed of electron oil pump to guarantee the success rate of shifting. However, when the vehicle speed is low, the noise generated by the electronic oil pump at high rotation speed is particularly prominent because the noise of the external environment of the vehicle is low (for example, the tire noise is low). At this time, in order to reduce noise generated from the electronic oil pump, it is necessary to correct the target rotation speed of the electronic oil pump.

Specifically, if the oil pressure range where the current oil pressure is located is a first oil pressure range and the current oil temperature is larger than a preset temperature threshold value, detecting and determining that the current vehicle speed is smaller than a third preset vehicle speed threshold value, and correcting the target rotating speed. It should be understood that the first oil pressure range is an oil pressure range required by the vehicle to shift gears, and the third preset vehicle speed threshold and the preset temperature threshold of the current oil temperature can be determined according to actual conditions; in the present embodiment, the first oil pressure range is 9bar, the third preset vehicle speed threshold is 10kph, and the preset temperature threshold of the current oil temperature is 50 ℃.

The following describes the control method of the vehicle according to this embodiment with reference to table three, when the current oil pressure is 5bar, the vehicle does not need to shift gears, the electronic oil pump only needs to meet the oil pressure requirement for lubricating and cooling the oil path, and there is no need to change the oil pressure greatly.

When current oil pressure is 9bar, the vehicle need shift, if the speed of a motor vehicle is more than 10kph, along with the increase of speed of a motor vehicle, the noise scheduling problem that the high rotational speed of electronic oil pump brought can be covered to the noise of vehicle external environment, therefore need not to consider the NVH problem when shifting this moment, directly acquire corresponding target rotational speed can. If the vehicle speed is below 10kph and the oil temperature of the transmission is more than 50 ℃, the electronic oil pump needs to ensure the gear shifting success rate and simultaneously give consideration to the NVH performance of the whole vehicle, so that the target rotating speed of the electronic oil pump needs to be corrected to avoid the problems of noise and the like caused by overhigh rotating speed of the electronic oil pump in the gear shifting process. For example, when the vehicle speed is lower than 10kph, the oil pressure of the transmission is 9bar, and the oil temperature of the transmission is between 70 ℃ and 120 ℃, the target rotating speed 3768r/min needs to be corrected to 3250 r/min. When the oil temperature of the transmission is between-10 ℃ and 50 ℃, the oil dilution is low, the leakage amount of an oil way is small, and the oil pressure during gear shifting can meet the requirement of gear shifting, so that the rotating speed of the electronic oil pump does not need to be corrected.

Watch III

It should be understood that, in the present embodiment, when the oil temperature is lower than the preset temperature, since the oil liquid has a high viscosity characteristic, the leakage amount of the oil liquid in the oil path is small, and therefore, it may be considered that the current rotation speed of the electronic oil pump does not need to be adjusted.

In summary, according to the control method of the vehicle provided by the embodiment of the invention, when it is recognized that the vehicle is currently in the pure electric mode driving state, the current oil temperature and the current oil pressure of the transmission in the vehicle are obtained; furthermore, according to the current oil temperature and the current oil pressure, the corresponding rotating speed of the electronic oil pump in the vehicle is determined, the rotating speed of the electronic oil pump is controlled, the electronic oil pump can be guaranteed to operate stably, and the NVH performance of the vehicle is improved while the vehicle is guaranteed to be smoothly shifted.

EXAMPLE III

In order to implement the method in the first embodiment, the invention further provides a control device of the vehicle.

Fig. 7 is a schematic structural diagram of a control device of a vehicle according to an embodiment of the disclosure, and as shown in fig. 7, the device includes:

the first identification module 701 is used for identifying the current running state of the vehicle in the pure electric mode;

a first obtaining module 702 for obtaining a current oil temperature of a transmission in a vehicle;

The first control module 703 is configured to perform shift control on the vehicle according to the current oil temperature.

Further, the vehicle is a hybrid vehicle, and the first control module 703 is further configured to:

detecting and determining a vehicle shift failure;

Further, the first control module 703 is further configured to:

detecting and determining that a vehicle shift is successful;

and controlling the engine to stop.

Further, the first obtaining module 702 is further configured to:

Further, the preselected gear corresponding to each gear lever position in the vehicle is the same.

It should be understood that, the above-mentioned apparatus is used for executing the method in the first embodiment, and the implementation principle and technical effect of the corresponding program module in the apparatus are similar to those described in the above-mentioned method, and the working process of the apparatus may refer to the corresponding process in the above-mentioned method, and is not described herein again.

In summary, in the control apparatus for a vehicle according to the embodiment of the present invention, when the first identification module identifies that the vehicle is currently in the pure electric mode driving state, the first obtaining module in the apparatus obtains a current oil temperature of a transmission in the vehicle; furthermore, the first control module determines a corresponding gear shifting strategy according to the current oil temperature, then executes the corresponding gear shifting strategy, and performs gear shifting control on the vehicle, and the formulated gear shifting strategy is related to the oil temperature of the transmission, so that the gear shifting success rate can be improved, the vehicle can smoothly complete gear shifting when a high-power electronic oil pump is not selected, smooth gear shifting of the vehicle is ensured on the premise of not increasing the energy consumption and the quality of the whole vehicle, and the NVH problem of the vehicle is not brought.

Example four

Fig. 8 is a schematic structural diagram of a control device of a vehicle according to an embodiment of the disclosure, and as shown in fig. 8, the device includes:

the second identification module 801 is used for identifying the current running state of the vehicle in the pure electric mode;

a second obtaining module 802 for obtaining a current oil temperature of a transmission and a current oil pressure of the transmission in the vehicle;

And the second control module 803 is used for controlling the rotating speed of the electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure.

Further, the second control module 803 is further configured to:

detecting and determining the oil pressure range of the current oil pressure;

Further, the second control module 803 is further configured to:

and if the oil pressure range where the current oil pressure is located is the first oil pressure range and the current oil temperature is greater than the preset temperature threshold value, detecting and determining that the current vehicle speed is less than a third preset vehicle speed threshold value, and correcting the target rotating speed.

It should be understood that the above-mentioned apparatus is used for executing the method in the second embodiment, and the implementation principle and technical effect of the apparatus are similar to those described in the above-mentioned method, and the working process of the apparatus may refer to the corresponding process in the above-mentioned method, and is not described herein again.

In summary, in the control apparatus for a vehicle according to the embodiment of the present invention, when the second identification module identifies that the vehicle is currently in the pure electric mode driving state, the second obtaining module in the apparatus obtains the current oil temperature and the current oil pressure of the transmission in the vehicle; furthermore, the second control module determines the corresponding rotating speed of the electronic oil pump in the vehicle according to the current oil temperature and the current oil pressure, so that the rotating speed of the electronic oil pump is controlled, the electronic oil pump can be guaranteed to operate stably, and the NVH performance of the vehicle is improved while the smooth gear shifting of the vehicle is guaranteed.

EXAMPLE five

In order to realize the third embodiment, an embodiment of the present invention provides a vehicle including the control device 100 of the vehicle in the third embodiment as shown in fig. 9.

EXAMPLE six

In order to realize the fourth embodiment, the embodiment of the invention provides a vehicle including the control device 200 of the vehicle in the fourth embodiment as shown in fig. 10.

EXAMPLE seven

In order to implement the first embodiment, an embodiment of the present invention provides an electronic device, as shown in fig. 11, the electronic device includes a memory 1101, a processor 1102; wherein the processor 1102 runs the program corresponding to the executable program code by reading the executable program code stored in the memory 1101, so as to implement the steps of the method in the first embodiment.

Example eight

In order to implement the second embodiment, an embodiment of the present invention provides an electronic device, as shown in fig. 12, the electronic device includes a memory 1201, a processor 1202; wherein the processor 1202 runs the program corresponding to the executable program code by reading the executable program code stored in the memory 1201, so as to implement the steps of the method in the second embodiment above.

Example nine

In order to implement the first embodiment, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program implements the steps of the method in the first embodiment when being executed by a processor.

Example ten

In order to implement the second embodiment, the embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program implements the steps of the method in the second embodiment when being executed by a processor.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. It will be understood by those of ordinary skill in the art that the above terms are used in the present invention as appropriate

The specific meanings of (A) and (B).

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A control method of a vehicle, characterized by comprising:

Identifying a driving state of the vehicle in a pure electric mode at present;

obtaining a current oil temperature of a transmission in the vehicle;

2. The method of claim 1, wherein the vehicle is a hybrid vehicle, and the performing shift control on the vehicle according to the current oil temperature comprises:

detecting and determining that the vehicle failed to shift;

3. The method of claim 2, wherein after controlling an engine in the vehicle to start, comprising:

detecting and determining that the vehicle shift was successful;

and controlling the engine to stop.

4. The method according to any one of claims 1 to 3, wherein the shift control of the vehicle according to the current oil temperature includes:

5. The method of claim 4, wherein the preselected gear for each gear lever position in the vehicle is the same.

6. A control method of a vehicle, characterized by comprising:

identifying a driving state of the vehicle in a pure electric mode at present;

7. The method of claim 6, wherein said controlling a rotational speed of an electronic oil pump in the vehicle based on the current oil temperature and the current oil pressure comprises:

detecting and determining the oil pressure range of the current oil pressure;

8. The method of claim 7, further comprising:

9. A control apparatus of a vehicle, characterized by comprising:

10. A control apparatus of a vehicle, characterized by comprising:

11. An electronic device comprising a memory, a processor;

wherein the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing the control method of the vehicle according to any one of claims 1 to 5; or, a control method for implementing the vehicle according to any one of claims 6 to 8.

12. A computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements a control method of a vehicle according to any one of claims 1 to 5; alternatively, the program implements the control method of the vehicle according to any one of claims 6 to 8 when executed by the processor.