CN114312737A

CN114312737A - Engine control method, device and system of hybrid vehicle and vehicle

Info

Publication number: CN114312737A
Application number: CN202011042947.0A
Authority: CN
Inventors: 刘亚威; 顾鸿鹏; 朱福堂; 王春生
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2022-04-12
Anticipated expiration: 2040-09-28
Also published as: CN114312737B

Abstract

The application discloses engine control method, device and system of hybrid vehicle and vehicle, including: when the hybrid vehicle enters a series mode, acquiring driving behavior information, SOC (state of charge) information of a battery and front road section information; and adaptively controlling the rotation speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information. The scheme of this application need not artifical manual switching mode, has reduced driver's driving strength, has avoided switching the not enough problem of whole car power that leads to in time, promotes driver's driving and experiences and feel.

Description

Engine control method, device and system of hybrid vehicle and vehicle

Technical Field

The invention relates to the technical field of engine control, in particular to an engine control method, device and system of a hybrid vehicle and the vehicle.

Background

The hybrid vehicle operating mode is generally classified into an EV mode (pure electric mode), a series mode and a parallel mode, wherein the series mode is that the engine does not directly participate in driving, but drives the generator to generate electricity, supplies electricity to the motor, and is driven by the motor. When entering the series mode, the engine speed is generally limited in consideration of the comfort of the entire vehicle. The hybrid vehicle has two modes of an ECO mode (energy saving mode)/a SPORT mode (SPORT mode), and the engine speed and the output power are different in the energy saving mode and the SPORT mode, so that the driving feeling of a driver is different, and the performance of the whole vehicle is different.

The existing energy-saving mode and the motion mode are usually switched manually, but mode switching can be untimely in manual operation, self-adaptive adjustment can not be realized, and the phenomena of insufficient power of the whole vehicle and over-fast power failure of the SOC (system on chip) can often occur under the working condition with high-power demand, so that the driving experience of a driver is poor.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide an engine control method, device, system and vehicle for a hybrid vehicle.

In a first aspect, the present invention provides an engine control method of a hybrid vehicle, comprising:

when the hybrid vehicle enters a series mode, acquiring driving behavior information, SOC (state of charge) information of a battery and front road section information;

and adaptively controlling the rotation speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information.

Alternatively, the method for adaptively controlling the rotation speed limiting mode of the engine according to the driving behavior information, the SOC information and the road section ahead comprises the following steps:

when the hybrid vehicle runs, the rotation speed limiting mode of the engine is controlled in real time according to the SOC information, and the method specifically comprises the following steps:

judging whether the SOC information is less than or equal to a first threshold value;

if so, switching the rotating speed limiting mode of the engine into a motion mode;

and if not, controlling the rotation speed limiting mode of the engine by combining the driving behavior information and the front road section information.

As an alternative, if the SOC information is greater than the first threshold, controlling the engine speed limiting mode by combining the driving behavior information and the road section ahead information includes:

when the driving behavior information meets a first limiting condition, controlling a rotating speed limiting mode of the engine according to the driving behavior information and the SOC information, wherein the first limiting condition is that the hybrid vehicle is in an accelerating state;

and when the front road information meets a second limiting condition, controlling a rotating speed limiting mode of the engine according to the front road information and the SOC information, wherein the second limiting condition is that the hybrid vehicle is in a climbing state.

As an alternative, the driving behavior information includes a current accelerator opening of the hybrid vehicle and a duration of the current accelerator opening, and the rotation speed limit mode of the engine is controlled according to the driving behavior information and the SOC information, including:

if the current accelerator opening is larger than or equal to the second threshold and the duration is larger than or equal to the third threshold, the hybrid vehicle is in a high-power demand mode, and the rotating speed limiting mode of the engine is switched to a motion mode;

and if the current accelerator opening is greater than or equal to the second threshold and the duration is less than the third threshold, or the current accelerator opening is less than the second threshold, controlling the rotation speed limiting mode of the engine according to the SOC information.

As an optional scheme, acquiring the front road section information includes:

acquiring a current position of the hybrid vehicle;

determining front road section information according to the current position of the hybrid vehicle and the map information, the front road section information being road section information located in front of the current position of the hybrid vehicle in the driving direction, the front road section information including indication information that an ascending road section or a descending road section exists at a predetermined distance from the current position of the hybrid vehicle, and a length and a gradient of the ascending road section or the descending road section.

Alternatively, the controlling of the engine speed limiting mode according to the road section information ahead and the SOC information includes:

acquiring a current vehicle speed and acceleration of the hybrid vehicle when indicating that an uphill road section exists at a predetermined distance from a current position of the hybrid vehicle;

calculating target SOC information required by an uphill road section according to the current speed, acceleration, slope length and slope of the hybrid vehicle;

if the target SOC information is larger than or equal to the SOC information, switching the rotating speed limiting mode of the engine into a motion mode;

if the target SOC information is smaller than the SOC information, switching the rotating speed limiting mode of the engine into an energy-saving mode;

when it is indicated that a downhill section exists at a predetermined distance from the current position of the hybrid vehicle, the rotation speed limiting mode of the engine is switched to the energy saving mode.

As an optional scheme, the target SOC information is greater than or equal to the SOC information, and the method further includes:

and controlling the engine to be in a driving state, wherein the driving state is used for driving the generator to work, and the generator provides the generated electric energy for the power battery to store energy and charge until the SOC information is equal to the target SOC information.

Alternatively, when it is indicated that a downhill section exists at a predetermined distance from the current position of the hybrid vehicle, the method further includes:

acquiring the current speed and acceleration of the hybrid vehicle;

calculating the power increment according to the current vehicle speed, acceleration, slope length and slope;

and determining the output torque of the motor according to the power increment, and sending the output torque to a motor control signal to control the output torque corresponding to the power generation state of the motor to store energy as a power battery.

In a second aspect, the present invention provides an engine control device for a hybrid vehicle, comprising:

the acquisition module is used for acquiring driving behavior information, SOC (state of charge) information of a battery and front road section information when the hybrid vehicle enters a series mode;

and the control module is used for adaptively controlling the rotating speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information.

In a third aspect, the present invention provides an engine control system for a hybrid vehicle, comprising a first collecting device, a second collecting device, a third collecting device and a processor, wherein the processor is respectively connected with an output end of the first collecting device, an output end of the second collecting device and an output end of the third collecting device;

the first acquisition device is used for acquiring driving behavior information;

the second acquisition device is used for acquiring SOC information;

the third acquisition device is used for acquiring information of a front road section;

the processor is used for adaptively controlling the rotating speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information.

In a fourth aspect, the invention provides a vehicle characterized by a processor for executing the engine control method of the hybrid vehicle of the first aspect.

In a fifth aspect, the invention provides a computer-readable storage medium having stored thereon a computer program for implementing the engine control method of the hybrid vehicle of the first aspect.

When the hybrid vehicle enters a series mode, driving behavior information, SOC information and front road section information are acquired; and adaptively controlling the rotation speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information. This application scheme need not artifical manual switching mode, has reduced driver's driving strength, has avoided switching the not enough problem of whole car power that leads to in time, satisfies hybrid vehicle and when can satisfy whole car dynamic property and the electric property demand of guaranteeing under the series connection mode, promotes driver's driving and experiences and feels.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic power transmission diagram of a hybrid vehicle;

fig. 2 is a schematic configuration diagram of an engine control system of a hybrid vehicle according to an embodiment of the invention;

fig. 3 is a flowchart illustrating an engine control method of a hybrid vehicle according to an embodiment of the present invention;

fig. 4 is a flowchart of an engine control method of a hybrid vehicle of the embodiment of the invention;

fig. 5 is a flowchart illustrating an engine control method of another hybrid vehicle according to the embodiment of the invention;

fig. 6 is a flowchart of an engine control apparatus of a hybrid vehicle according to an embodiment of the present invention;

fig. 7 is a flowchart of an engine control apparatus of another hybrid vehicle according to the embodiment of the invention;

fig. 8 is a schematic structural diagram of a computer system of a terminal device according to an embodiment of the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

When a hybrid vehicle enters a series mode, the rotating speed and the output power of an engine are generally adjusted in consideration of the comfort of the whole vehicle, the conventional hybrid vehicle generally performs the mode switching of limiting the rotating speed of the engine manually, and manually switches the energy-saving mode/motion mode of the hybrid vehicle, wherein the vehicle can automatically match the optimal gear and rotating speed to reduce oil consumption in the energy-saving mode, so that the optimal fuel consumption is realized, the fuel is economical and economical, the rotating speed of the engine is relatively low, and the output power of the engine is relatively low; the vehicle can instantly improve the rotating speed in the moving mode, the oil consumption is high, the rotating speed of the engine is relatively high, the output power of the engine is relatively high, and the driving pleasure of a driver is improved.

The existing situation that a driver needs to manually operate and mode switching is not timely occurs, so that the phenomena of power shortage of a whole vehicle and power failure of a battery in a nuclear power State (representing the ratio of the residual capacity of the battery to the full-power State capacity of the battery, State of Charge and SOC for short) are caused to occur too fast in a high-power mode. And self-adaptive adjustment cannot be carried out, so that the driving intensity of a driver is increased, and the driving safety is not facilitated. And the road section information of the front road section cannot be predicted and adjusted according to the GPS information, so that the driving experience is poor.

As shown in fig. 1, the hybrid vehicle includes: the engine is in mechanical transmission connection with the motor through a related transmission mechanism, such as: the power battery is electrically connected with the motor through the motor controller, and the vehicle control unit is electrically connected with the engine and the electric controller. The engine drives the generator to generate electricity, the generated electric energy is transmitted to the motor through the motor controller, and the motor converts the electric energy into mechanical energy to drive the hybrid vehicle to run. The power battery is an energy storage device between the generator and the motor, and plays a role in power balance, namely when the power generated by the generator is greater than the power required by the motor (such as the working conditions of deceleration sliding, low-speed running or short-time parking of a hybrid vehicle and the like), redundant electric energy charges the power battery; when the power generated by the generator is lower than the power required by the motor (such as the working conditions of starting, accelerating, climbing, high-speed running and the like of the hybrid vehicle), the power battery provides extra electric energy for the motor, supplements the deficiency of the power of the generator and meets the requirement of the peak power of the vehicle.

Based on the above problems, embodiments of the present application provide an engine control method for a hybrid vehicle, in which a VCU or a processor acquires driving behavior information, SOC information, and front road information in real time, and adaptively controls a rotation speed limiting mode of an engine according to the driving behavior information, the SOC information, and the front road information, so that the vehicle can meet the requirements of vehicle dynamics and power conservation in a series mode, and the driving feeling of a driver is improved.

It can be understood that, in order to implement an adaptive method for adjusting a rotation speed limit mode of vehicle starting in real time according to driving behavior information, SOC information, and front road information, a first acquisition device, a second acquisition device, and a third acquisition device are configured on a vehicle, such as an autonomous vehicle, and the first module is used for acquiring a vehicle speed, an engine rotation speed, an accelerator opening (throttle opening), an acceleration, and the like of the vehicle in real time. The first acquisition module can be a vehicle speed sensor, an Inertia Measurement Unit (IMU), a rotating speed sensor, an accelerator opening sensor and the like. The second acquisition device is used for acquiring real-time position information of the vehicle, such as longitude, latitude and the like, and acquiring road section information of a road section ahead of the current position of the vehicle according to the position information of the vehicle and a high-precision map, wherein the road section information comprises an uphill road section, a downhill road section, a slope length, a slope and the like at a preset distance ahead. The second acquisition module can be a Global positioning System (GPS for short), a camera, a millimeter radar, a laser radar, an ultrasonic radar, and the like. The third acquisition module is used for acquiring relevant parameters of the power battery, such as SOC information of the power battery. The third acquisition module can be a Battery Management System (BMS), or a motor controller.

And the VCU acquires the information respectively acquired by the first acquisition module, the second acquisition module and the third acquisition module in real time. After acquiring the information, the VCU outputs a control signal to control the execution structure to automatically adjust the rotating speed limiting mode of the engine of the vehicle according to the acquired information and the prestored parameter thresholds. Wherein, actuating mechanism includes: an engine, an electric motor and a power battery; pre-stored parameter thresholds such as, but not limited to: a first threshold, a second threshold, a third threshold; the first threshold value is the minimum value of SOC based on the electricity conservation requirement, the second threshold value is the lowest accelerator opening degree when the wheel end output power meets the high power, and the third threshold value is the shortest value of the holding time of the accelerator opening degree when the wheel end output power meets the high power under the lowest accelerator opening degree or a certain accelerator opening degree larger than the lowest accelerator opening degree.

It is also understood that the vehicle may be an autonomous vehicle or a general hybrid vehicle, and the engine control method of a hybrid vehicle of the embodiment of the present application may be executed by a terminal device provided on the vehicle. The terminal device is loaded with a control system as shown in fig. 2, and the control system includes a vehicle control unit 100, a first collection device 200, a second collection device 300, and a third collection device 400. The vehicle control unit 100 comprises an acquisition module 101 and a control module 102, the acquisition module 101 is used for acquiring data acquired by the first acquisition device 200, the second acquisition device 300 and the third acquisition device 400, and the control module 102 is used for adaptively controlling a speed limit mode of starting the vehicle according to the data acquired by the first acquisition device 200, the second acquisition device 300 and the third acquisition device 400 acquired by the acquisition module 101, so that the speed limit mode of the engine can be adaptively controlled, the hybrid vehicle can meet the requirements of vehicle dynamics and power conservation in a series mode, the driving strength of a driver is reduced, and the driving experience of the driver is improved.

The terminal device may be hardware or software. When the terminal device is hardware, it may be an electronic device, including but not limited to a tablet computer, a notebook computer, a desktop computer, and the like. When the terminal device is software, the terminal device can be installed in the aforementioned various electronic devices. It may also be implemented as single or multiple software or software modules. The embodiment of the present application does not set any limit to the specific type of the electronic device.

Fig. 3 is a flowchart illustrating an engine control method of a hybrid vehicle according to an embodiment of the present application. The method is executed by a terminal device arranged on a vehicle, please see fig. 3, and comprises the following steps:

s100, when the hybrid vehicle enters a series mode, acquiring driving behavior information, SOC information and front road information;

specifically, the hybrid vehicle is hereinafter referred to as a vehicle, and the series mode means that the engine does not participate in direct driving, the engine drives the generator to generate electricity, the generated electric energy is transmitted to the motor through the motor controller, and the motor converts the electric energy into mechanical energy to drive the vehicle to run. The power battery is an energy storage device between the generator and the motor, and plays a role in power balance, namely when the power generated by the generator is greater than the power required by the motor (such as the working conditions of vehicle deceleration sliding, low-speed running or short-time parking and the like), redundant electric energy charges the power battery; when the power generated by the generator is lower than the power required by the motor (such as the working conditions of vehicle starting, acceleration, climbing, high-speed running and the like), the power battery provides additional electric energy for the motor, the power deficiency of the generator is supplemented, and the peak power requirement of the vehicle is met.

In this embodiment, a vehicle operating mode parameter table is preset in the VCU, where the vehicle operating mode parameter table shows vehicle parameters of the vehicle in each operating mode (EV mode, parallel mode, and series mode), and the vehicle parameters include a wheel-end output power range of the vehicle, a vehicle speed range of the vehicle, and an SOC information range of the power battery in the EV mode, the parallel mode, and the series mode, respectively. In the running process of the vehicle, the VCU can obtain the wheel end output power, the vehicle speed and the SOC information in real time, and when the wheel end output power, the vehicle speed and the SOC information are in the corresponding wheel end output power range of the vehicle, the vehicle speed range of the vehicle and the SOC information range of the power battery in the series mode, the VCU determines that the vehicle enters the series mode. When the vehicle enters a series mode, the VCU acquires driving behavior information, SOC information and front road section information at the current moment in real time.

The driving behavior information comprises the current accelerator opening, and the current accelerator opening can be acquired through an accelerator sensor. The current accelerator opening can reflect the output power of the wheel end of the vehicle, and when the current accelerator opening reaches a certain threshold value and continues for a certain time under the current accelerator opening, the VCU determines that the vehicle is in a high-power demand mode.

It should be noted that when the current accelerator opening reaches a certain threshold, but the current accelerator opening does not last for a certain duration, it may be that the driver steps on the accelerator by mistake, and the VCU determines that the vehicle is in the non-high-power demand mode.

The SOC information can be output by a battery management system or a motor controller, the VCU acquires the SOC information, the VCU is favorable for monitoring the SOC information in real time, and the rotating speed limiting mode of the engine is controlled according to the size of the SOC information.

The road section information ahead may be understood as road section information located ahead of the current position of the vehicle in the direction of travel, including indication information that an uphill road section or a downhill road section is present at a predetermined distance from the current position of the vehicle, and a gradient and a slope length of the uphill road section or the downhill road section.

And S200, adaptively controlling the rotation speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information.

And the VCU controls the engine rotating speed limiting mode in a self-adaptive mode according to the acquired driving behavior information, the SOC information and the front road section information.

After the vehicle is electrified and normally started, the VCU defaults that the vehicle is in an energy-saving mode (EOC mode) when being started, and under the energy-saving mode, the rotating speed of an engine is relatively low, the output power is small, the oil consumption is saved, and the power battery simultaneously provides electric energy for the motor in the normal running process of the vehicle. In order to protect the performance of the power battery and the normal operation of other electric devices in the vehicle, the VCU controls the rotation speed limiting mode of the engine in real time according to the SOC information, for example, when the SOC information acquired by the VCU is lower than a certain threshold (which may be 10%), which indicates that the electric quantity of the power battery is insufficient, the VCU controls the rotation speed limiting mode of the engine to switch to the motion mode, so as to increase the rotation speed and output power of the engine, ensure the normal running of the vehicle, and ensure the requirement of the power conservation of the vehicle.

When the driving behavior information acquired by the VCU comprises the current accelerator opening of the vehicle, the VCU judges the current accelerator opening acquired in real time, and determines that the current accelerator opening is increased by comparing the current accelerator opening with the accelerator opening at other moments, and the VCU controls the rotating speed limiting mode of the engine according to the driving behavior information and the SOC information.

And when the front road section information acquired by the VCU indicates that the front of the current position is an uphill road section or a downhill road section, controlling the rotating speed limiting mode of the engine according to the corresponding front road section information and the SOC information.

It can be understood that the VCU controlling the engine speed limiting mode according to the SOC information is a real-time process, and the VCU controls the engine speed limiting mode according to the SOC information whenever the vehicle may be switched to the energy saving mode, regardless of the current operation state of the vehicle in any mode or whether there is an uphill road section or a downhill road section on a road section ahead.

According to the engine control method of the hybrid vehicle, the driving behavior information, the SOC information and the front road information are acquired by the VCU, the rotating speed limiting mode of the engine is controlled adaptively according to the driving behavior information, the SOC information and the front road information acquired by the VCU, the requirements of the vehicle on the whole vehicle dynamic property and the electricity conservation property can be met, and the driving feeling of a driver is improved.

Further, on the basis of the above embodiment, to further explain the above embodiment, fig. 4 shows a flowchart of an engine control method of a hybrid vehicle of the invention. Fig. 5 shows a flowchart of an engine control method of another hybrid vehicle of the embodiment of the invention. As shown in fig. 4 and 5, the method specifically includes:

s100, when the hybrid vehicle enters a series mode, acquiring driving behavior information, SOC (state of charge) information of a battery and front road section information;

specifically, step S100 in this embodiment is the same as step S100 in the previous embodiment, and is not described herein again.

Further, the step S200 of adaptively controlling the engine speed limiting mode according to the driving behavior information, the SOC information and the road section ahead information includes:

s201, in the running engineering of the hybrid vehicle, controlling a rotating speed limiting mode of an engine according to SOC information in real time, and specifically comprising the following steps:

if so, indicating that the power battery is in a low SOC mode, and switching the rotating speed limiting mode of the engine into a motion mode;

and if not, controlling the rotation speed limiting mode of the engine by combining the driving behavior information or the front road section information.

Specifically, based on the fact that other electric devices on the vehicle can work normally and the performance of the power battery is protected, the rotating speed mode of the engine is controlled in real time according to the SOC information in the running process of the vehicle, and therefore the situation that the SOC of the power battery is too fast when the vehicle runs in a high-power mode or the SOC of the power battery is lower than a threshold value in the running process of the vehicle is avoided, the electric quantity of the power battery continuously decreases under the energy-saving mode, the vehicle cannot work normally, and the service life of the power battery is influenced.

The first threshold is a minimum state of charge of the power battery preset in the VCU, and the specific size of the first threshold may be actually calibrated according to different vehicle types, different performances of the power battery, different power configurations, and different control requirements, for example, the first threshold is generally 20%.

After the vehicle is started, the VCU compares the acquired SOC information with a first threshold preferentially, if the SOC information is smaller than or equal to the first threshold, the electric quantity of the power battery is too low, the power battery is in a low SOC mode, and the VCU switches the rotating speed limit of the engine into a motion mode no matter the driving behavior information or the front road section information of the vehicle is in any mode, so that the performance of the power battery is protected, the requirement of power conservation is met, and the normal work of other electric devices on the vehicle is ensured; if the SOC information is larger than the first threshold value, the electric quantity of the power battery can provide vehicle power, and the VCU controls an engine rotating speed limiting mode according to the driving behavior information and the front road section information so as to meet the requirements of oil consumption saving, energy saving and environmental protection, ensure the whole vehicle power and improve the driving feeling of a driver.

Further, if the SOC information is greater than the first threshold, controlling the engine speed limit mode in combination with the driving behavior information or the road section ahead information, including:

s202, when the driving behavior information meets a first limiting condition, controlling a rotating speed limiting mode of the engine according to the driving behavior information and the SOC information, wherein the first limiting condition is that the hybrid vehicle is in an accelerating state;

and S203, when the front road section information meets a second limiting condition, controlling a rotating speed limiting mode of the engine according to the front road section information and the SOC information, wherein the second limiting condition is that the hybrid vehicle is in a climbing state.

The first limiting condition is that the vehicle is in an acceleration state, wherein the vehicle is not limited to be determined by the change conditions of a gear lever, a clutch pedal, an accelerator pedal and a brake pedal.

Accordingly, the driving behavior information includes the shift position of the shift lever, the opening and closing of the clutch pedal, the accelerator opening, and the opening of the brake pedal.

For a manually shifted vehicle, when the clutch pedal is depressed closed and the gear position of the shift lever is increased, the VCU determines that the vehicle is in an acceleration state; for an automatic shift vehicle, when the shift position of the shift lever is changed from the L-range to the S-range or the D-range (the shift position of different automatic shift vehicles may be different, and it is understood that the shift position is changed from a low-speed shift position to a high-speed-drivable shift position), the VCU determines that the vehicle is in an acceleration state;

the VCU may also determine that the vehicle is in an acceleration state when the opening degree of the brake pedal is decreased; generally, since the greater the opening degree of the brake pedal, the lower the speed of the vehicle and even the vehicle speed is zero, when the opening degree of the brake pedal is reduced to zero, it is considered that the vehicle is started, and thereafter, the opening degree of the accelerator is increased and the vehicle is in acceleration running. Therefore, while the VCU determines whether it is in an acceleration state by the opening degree of the brake pedal, the VCU generally determines whether the train is in an acceleration state by using the opening degree of the brake pedal in cooperation with the opening degree of the accelerator.

It can be understood that, when the vehicle is in the acceleration state or not is reflected by the gear shift of the shift lever, the opening and closing of the clutch pedal and the opening of the brake pedal, the opening of the accelerator pedal of the vehicle is increased, and therefore, in this embodiment, the VCU can determine whether the train is in the acceleration state or not only by judging the opening of the accelerator.

Illustratively, the driving behavior information is a current accelerator opening, the VCU acquires the current accelerator opening in real time during the driving of the vehicle, the VCU compares the current accelerator opening with the accelerator opening acquired before the current time, if the current accelerator opening suddenly increases, it indicates that the vehicle may need an acceleration or high-power demand mode, and the vehicle needs the engine to provide higher rotation speed and higher output power, so the rotation speed limit mode of the engine needs to be controlled according to the driving behavior information and the SOC information.

In the vehicle form process, the VCU may predict road section information ahead of the current position of the vehicle in real time, based on the built-in high-precision map information and the acquired current position information of the vehicle acquired by the third acquisition device (e.g., GPS), the road section information ahead including the presence of an uphill road section or a downhill road section ahead of the current position of the vehicle, and the gradient and the length of the slope.

The second limitation condition is that the vehicle is in a climbing state, and the vehicle is not limited to the determination that there is an uphill road section ahead of the current position of the vehicle or the gradient situation of the road section ahead by the road section ahead information indicating that there is an uphill road section ahead.

When the front road section information indicates that an uphill road section exists in front of the current position of the vehicle, the VCU can determine that the vehicle is about to enter a climbing state; or the current road section information indicates that the gradient of the road section in front of the current position of the vehicle is a positive number, and the VCU can determine that the vehicle is about to enter a climbing state; when the vehicle is in a climbing state, the vehicle needs larger power output by the engine to overcome the resistance of the ramp; when the vehicle runs on a downhill road section, the vehicle can provide certain power due to downhill sliding, and an engine is not needed to output large power. Therefore, the front road information meets the second limiting condition value, and the VCU controls the rotating speed limiting mode of the engine according to the front road information and the SOC information.

Further, as an implementation manner, S202, the driving behavior information includes a current accelerator opening of the hybrid vehicle and a duration of the current accelerator opening, and the control of the rotation speed limit mode of the engine according to the driving behavior information and the SOC information specifically includes:

It should be noted that the current accelerator opening may be used to directly reflect the output power of the wheel end, and the larger the accelerator opening, the larger the output power of the wheel end. The second threshold is a threshold of the accelerator opening preset in the VCU, and the third threshold is a holding time of the accelerator opening preset in the VCU. The specific size of the second threshold and the third threshold may be actually calibrated according to different vehicle types, different power configurations, and different control requirements, for example, the second threshold is generally 80%, and the third threshold is generally 10 s.

In order to avoid the problem that the increase of the current accelerator opening is caused by the fact that a driver steps on the accelerator mistakenly, only when the current accelerator opening and the duration exceed corresponding threshold values, the VCU determines that the vehicle is in a high-power demand mode, and the VCU switches the rotating speed limiting mode of the engine into a motion mode so as to meet the power requirement and the electricity conservation requirement of the whole vehicle and improve the driving feeling of the driver.

If the current accelerator opening is larger than or equal to the second threshold value but the duration is smaller than the third threshold value, the VCU determines that the vehicle is not in a high-power requirement, and determines that the vehicle is accelerated (for example, the vehicle starts) or runs at a high speed and the like due to the fact that the driver steps on the accelerator by mistake or under other conditions; or the current accelerator opening is increased relative to the accelerator opening before the current time, but the front accelerator opening is smaller than the second threshold, the VCU determines that the vehicle accelerates, runs at a high speed and the like, so the VCU further determines the rotation speed limiting mode of the engine by combining the real-time SOC information, when the SOC information is larger than the first threshold, the VCU switches the rotation speed limiting mode of the engine to the energy-saving mode, and when the SOC information is smaller than or equal to the first threshold, the VCU switches the rotation speed limiting mode of the engine to the motion mode.

Further, in the above embodiment, in step S100, obtaining the driving behavior information, the SOC information of the battery, and the information of the road section ahead, obtaining the information of the road section ahead specifically includes:

acquiring a current position of the hybrid vehicle;

determining front road section information according to the current position of the hybrid vehicle and the map information, wherein the front road section information refers to road section information which is positioned in front of the current position of the hybrid vehicle in the driving direction, and the front road section information comprises indication information that an ascending road section or a descending road section exists at a preset distance of the current position of the hybrid vehicle, and the slope length and the slope gradient of the ascending road section or the descending road section.

Specifically, the VCU acquires the current position of the vehicle acquired by the second acquisition device, and the current position of the vehicle is determined by combining with the high-precision map information to obtain the information of the front road section. The high-precision map information refers to vehicle-mounted map information, and the high-precision map information comprises an uphill road section or a downhill road section which exists at a preset distance in front of the current position of the vehicle, wherein the preset distance is determined according to the precision of different maps, and is generally 300-500 m. The high-precision map is combined with the current position of the vehicle to directly display an uphill road section or a downhill road section and the corresponding slope length and the corresponding slope of the uphill road section or the downhill road section at a preset distance in front of the current position of the vehicle on the map. The VCU directly reads the front road section information in the high-precision map information.

Further, in step S203, controlling the rotation speed limiting mode of the engine according to the road section information ahead and the SOC information specifically includes:

acquiring a current speed and acceleration of the hybrid vehicle when an uphill road section exists at a predetermined distance indicating a current position of the hybrid vehicle;

if the target SOC information is smaller than the SOC information, controlling a rotating speed limiting mode of the engine according to the SOC information;

when a downhill section exists at a predetermined distance indicating the current position of the hybrid vehicle, the rotation speed limiting mode of the engine is switched to the energy saving mode.

It should be noted that, the VCU acquires the current speed and acceleration of the vehicle by the first acquisition device, where the first acquisition device may include a speed sensor and an IMU, the speed sensor is used to acquire the speed of the vehicle, and the IMU is used to acquire the acceleration of the vehicle.

An SOC estimation table is pre-arranged in the VCU, the SOC estimation table shows the corresponding calculation relation of the speed, the acceleration, the slope length and the slope of the vehicle and the SOC, and the VCU calculates the target SOC information required by the uphill road section by combining the current speed, the acceleration, the slope length and the slope acquired by the SOC estimation table.

It is understood that the target SOC information calculated from the SOC estimation table refers to the minimum value of SOC information that the vehicle can pass through an uphill road section, that is, the minimum value of SOC information that can satisfy both the power demand and the power conservation demand of the vehicle passing through an uphill road section, where the target SOC information is generally larger than the first threshold value.

If the target SOC information is larger than or equal to the SOC information acquired by the VCU, the current SOC of the power battery of the vehicle is determined to be incapable of meeting the power demand and the electricity-preserving demand of the vehicle passing through an uphill road section, therefore, the VCU switches the rotation speed limiting mode of the engine to the motion mode, controls the engine to be in a driving state, the driving state is used for driving the generator to work, and the generator provides the generated electric energy for storing energy and charging the power battery until the SOC information is equal to the target SOC information.

And if the target SOC information is less than the SOC information acquired by the VCU, which indicates that the current SOC information of the power battery is enough to provide the power demand of the vehicle for passing through the uphill road section, the VCU switches the rotation speed limiting mode of the engine to the energy-saving mode.

Further, when there is a downhill section at a predetermined distance from the current position of the hybrid vehicle, the method further includes:

acquiring the current speed and acceleration of the hybrid vehicle;

and controlling the motor to store energy for the power battery according to the power increment.

The VCU acquires the current speed and the acceleration of the vehicle of the first acquisition device, wherein the first acquisition device can comprise a speed sensor and an IMU, the speed sensor is used for acquiring the speed of the vehicle, and the IMU is used for acquiring the acceleration of the vehicle.

When the vehicle travels on a downhill road, an increased amount of power is generated due to downhill coasting. Calculating the power increment according to the current vehicle speed, acceleration, slope length and slope, and comprising the following specific processes:

calculating to obtain power generated by downhill sliding according to the gravity and the gradient of the vehicle by combining the stress analysis of the vehicle on the downhill section; calculating the average speed of the downhill road section according to the current speed and the acceleration; and multiplying the calculated power and the average speed to obtain the power increment.

The power increment is taken by the motor for energy recovery, for example, a torque value required to be output by the motor is calculated according to the rotating speed of the motor, the VCU sends a control signal to the motor, and the motor receives the control signal and controls the output torque corresponding to the power generation state of the motor according to the control signal so as to charge the power battery for energy storage.

When the hybrid vehicle runs on a downhill road section, the energy storage process is generally carried out on the power battery, and the VCU controls the motor to consume the power increment of downhill sliding, so that the energy storage is carried out on the power battery while the vehicle speed of the vehicle on the downhill road section is maintained within a reasonable range.

In summary, according to the engine control method of the hybrid vehicle provided by the present application, the VCU can adaptively control the engine rotation speed limitation mode according to the driving behavior information, the SOC information, and the road section ahead of the vehicle. Compared with the prior art, the scheme of the application does not need manual mode switching, the driving strength of a driver is reduced, and the problem of insufficient power of the whole vehicle caused by untimely switching is avoided. And the road information in front of the current position of the vehicle can be acquired in advance according to the position information of the vehicle, and the rotating speed limiting mode of the engine can be adjusted in time. The scheme of this application can realize fuel economy, when satisfying the power demand of vehicle under high-power demand and the demand of protecting the electric property, has promoted driver's driving and has experienced the sense.

On the other hand, an embodiment of the present application provides an engine control apparatus 500 of a hybrid vehicle, as shown in fig. 6, the apparatus 500 including:

the acquiring module 501 is configured to acquire driving behavior information, state of charge (SOC) information of a battery, and information of a road section ahead when the hybrid vehicle enters a series mode;

and the control module 502 is used for adaptively controlling the rotating speed limiting mode of the engine according to the driving behavior information, the SOC information and the road section information ahead.

Further, the control module 502 is further configured to perform:

in the hybrid vehicle driving engineering, the method for controlling the rotating speed limiting mode of the engine according to the SOC information in real time specifically comprises the following steps:

Further, if the SOC information is greater than the first threshold, the control module 502 executes a process of controlling a rotation speed limit mode of the engine in combination with the driving behavior information or the road section information ahead, including:

As an implementable manner, the driving behavior information includes a current accelerator opening degree of the hybrid vehicle and a duration of the current accelerator opening degree, and the control module 502 executes a process of controlling a rotation speed limitation mode of the engine according to the driving behavior information and the SOC information, and further executes:

Further, as shown in fig. 7, the acquiring module 501 executes a process of acquiring the front road information, and is further configured to execute:

a first acquisition unit for acquiring a current position of the hybrid vehicle;

a determination unit for determining front road section information according to a current position of the hybrid vehicle and the map information, the front road section information being road section information located in front of the current position of the hybrid vehicle in a driving direction, the front road section information including indication information that an uphill road section or a downhill road section exists at a predetermined distance from the current position of the hybrid vehicle, a length of the uphill road section or the downhill road section, and a gradient.

As an implementation manner, the control module 502 performs a process of controlling a rotation speed limit mode of the engine according to the road section information ahead and the SOC information, and further includes:

calculating target SOC information of an uphill road section according to the current speed, acceleration, slope length and slope of the hybrid vehicle;

Further, the control module 202 is further configured to perform, if the target SOC information is greater than or equal to the SOC information:

Further, the control module 202 is further configured to perform, when there is a downhill section at a predetermined distance from the current position of the hybrid vehicle:

acquiring the current speed and acceleration of the hybrid vehicle;

The principle and effect of the control device of this embodiment are the same as those of the control method described above, and are not described herein again.

It should be understood that the units or modules described in the engine control device of the hybrid vehicle correspond to the respective steps in the method described with reference to fig. 3 or 4. Thus, the operations and features described above for the method are equally applicable to the train positioning device and the units contained therein and will not be described in detail here. The engine control method of the hybrid vehicle can be realized in a browser or other safety applications of the electronic equipment in advance, and can also be loaded into the browser or other safety applications of the electronic equipment in a downloading mode or the like. The respective units in the engine control device of the hybrid vehicle may cooperate with units in the electronic apparatus to implement the solution of the embodiment of the present application. The division into several modules or units mentioned in the above detailed description is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

In another aspect, an embodiment of the present application provides an engine control system of a hybrid vehicle, the control system including:

the system comprises a first acquisition device, a second acquisition device, a third acquisition device and a processor, wherein the processor is respectively connected with the output end of the first acquisition device, the output end of the second acquisition device and the output end of the third acquisition device;

the second acquisition device is used for acquiring SOC information;

The control system of the present embodiment has the same principle and effect as the control method described above, and is not described herein again.

In another aspect, an embodiment of the present application provides a vehicle including a processor for executing the engine control method of the hybrid vehicle of the first aspect.

Referring now to FIG. 8, shown is a block diagram of a computer system 600 suitable for use in implementing a terminal device of an embodiment of the present application.

As shown in fig. 8, the computer system 600 includes a Central Processing Unit (CPU)601 that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM)602 or a program loaded from a storage section 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data necessary for the operation of the system 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.

The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output portion 607 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The driver 610 is also connected to the I/O interface 505 as necessary. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that a computer program read out therefrom is mounted in the storage section 608 as necessary.

In particular, according to embodiments of the present application, the processes described above with reference to fig. 3 or 4 may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method of fig. 3 or 4. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 609, and/or installed from the removable medium 611.

It should be noted that the computer readable medium shown in the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units or modules described in the embodiments of the present application may be implemented by software or hardware. The described units or modules may also be provided in a processor, and may be described as: a processor includes an acquisition module and a control module. Where the names of these units or modules do not in some cases constitute a limitation of the units or modules themselves, the control module may also be described as a "module for adaptively controlling the rotational speed limitation mode of the engine according to driving behavior information, SOC information, road section ahead information, for example.

As another aspect, the present application also provides a computer-readable storage medium, which may be the computer-readable storage medium included in the foregoing device in the foregoing embodiment; or it may be a separate computer readable storage medium not incorporated into the device. The computer-readable storage medium stores one or more programs for one or more processors to execute the engine control method for a hybrid vehicle described in the present application

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An engine control method of a hybrid vehicle, characterized by comprising:

and adaptively controlling the rotating speed limiting mode of the engine according to the driving behavior information, the SOC information and the front road section information.

2. The method of claim 1, wherein adaptively controlling a rotational speed limiting mode of an engine according to the driving behavior information, the SOC information, and the road section ahead information comprises:

when the hybrid vehicle runs, the method for controlling the rotating speed limiting mode of the engine according to the SOC information in real time specifically comprises the following steps:

judging whether the SOC information is smaller than or equal to a first threshold value;

3. The method of claim 2, wherein controlling a rotational speed limit mode of an engine in conjunction with the driving behavior information or the road section ahead information if the SOC information is greater than the first threshold value comprises:

when the driving behavior information meets a first limiting condition, controlling a rotating speed limiting mode of an engine according to the driving behavior information and the SOC information, wherein the first limiting condition is that the hybrid vehicle is in an accelerating state;

and when the front road section information meets a second limiting condition, controlling a rotating speed limiting mode of an engine according to the front road section information and the SOC information, wherein the second limiting condition is that the hybrid vehicle is in a climbing state.

4. The method according to claim 3, wherein the driving behavior information includes a current accelerator opening of the hybrid vehicle and a duration of the current accelerator opening, and controlling a rotational speed limit mode of an engine according to the driving behavior information and the SOC information includes:

if the current accelerator opening is larger than or equal to a second threshold value and the duration is larger than or equal to a third threshold value, the hybrid vehicle is in a high-power demand mode, and the rotating speed limiting mode of the engine is switched to a motion mode;

and if the current accelerator opening is larger than or equal to a second threshold value and the duration is smaller than a third threshold value, or the current accelerator opening is smaller than the second threshold value, controlling a rotating speed limiting mode of the engine according to the SOC information.

5. The method according to claim 3, wherein acquiring the front road segment information comprises:

acquiring a current position of the hybrid vehicle;

determining the front road information according to the current position of the hybrid vehicle and the map information, wherein the front road information is road information located in front of the current position of the hybrid vehicle in the driving direction, and the front road information comprises indication information that an uphill road section or a downhill road section exists at a predetermined distance from the current position of the hybrid vehicle, and a length and a gradient of the uphill road section or the downhill road section.

6. The method of claim 5, wherein controlling a speed limit mode of an engine according to the road section ahead information and the SOC information comprises:

acquiring a current vehicle speed and acceleration of the hybrid vehicle when an uphill road section is indicated to exist at a predetermined distance from a current position of the hybrid vehicle;

calculating target SOC information required by the uphill road section according to the current speed, the acceleration, the slope length and the slope of the hybrid vehicle;

if the target SOC information is larger than or equal to the SOC information, switching a rotating speed limiting mode of the engine into a motion mode;

if the target SOC information is smaller than the SOC information, switching a rotating speed limiting mode of the engine into an energy-saving mode;

7. The method of claim 6, wherein the target SOC information is greater than or equal to the SOC information, the method further comprising:

8. The method according to claim 5, wherein when a downhill section is indicated at a predetermined distance of a current location of the hybrid vehicle, the method further comprises:

acquiring the current speed and acceleration of the hybrid vehicle;

calculating a power increment according to the current vehicle speed, the acceleration, the slope length and the slope;

and determining the output torque of the motor according to the power increment, and sending the output torque to the motor control signal to control the output torque corresponding to the power generation state of the motor to be used as a power battery for storing energy.

9. An engine control device for a hybrid vehicle, characterized by comprising:

10. The engine control system of the hybrid vehicle is characterized by comprising a first acquisition device, a second acquisition device, a third acquisition device and a processor, wherein the processor is respectively connected with the output end of the first acquisition device, the output end of the second acquisition device and the output end of the third acquisition device;

the second acquisition device is used for acquiring SOC information;

11. A vehicle characterized by comprising a processor for executing the engine control method of a hybrid vehicle according to any one of claims 1 to 8.

12. A computer-readable storage medium having stored thereon a computer program for implementing the engine control method of a hybrid vehicle according to any one of claims 1 to 8.