CN117184041A

CN117184041A - Hybrid vehicle control method and device, storage medium and vehicle

Info

Publication number: CN117184041A
Application number: CN202311282561.0A
Authority: CN
Inventors: 余佳衡
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2023-12-08

Abstract

The embodiment of the application provides a control method, a device, a storage medium and a vehicle for a hybrid electric vehicle, which belong to the technical field of vehicles. According to the embodiment of the application, the current vehicle speed and the current residual electric quantity are comprehensively considered, so that a proper target control strategy can be matched for the vehicle when the power battery has preset faults and the engine is in an idle working condition, further the idle rotation speed of the engine and the working state of the storage battery are flexibly adjusted, the charging requirement of the storage battery is met, and meanwhile, the situation that the driving experience of a user is influenced because the engine is always in a higher idle rotation speed is avoided.

Description

Hybrid vehicle control method and device, storage medium and vehicle

Technical Field

The present application relates to the field of vehicle technologies, and in particular, to a hybrid vehicle control method and apparatus, a storage medium, and a vehicle.

Background

Energy conservation and emission reduction are the trend of pursuing the automobile industry at present, the specific gravity of new energy automobiles is continuously increased in the automobile industry, and the hybrid electric vehicle has a considerable market prospect as an important research development direction of the current automobile industry.

The hybrid vehicle is composed of two power sources, an engine and a battery. After the power battery has serious faults, the high-voltage relay of the power battery is disconnected, and the engine singly drives the vehicle to run, and at the moment, the low-voltage equipment of the vehicle is powered by the storage battery.

At present, after a high-voltage relay is disconnected from a power battery, in order to avoid the power shortage of the storage battery, an engine driving motor is controlled to directly supply power to the storage battery, however, in order to keep the stable power generation of the motor, the current engine generally adopts a higher idle speed driving motor to generate power, and the lowest vehicle speed which can normally run of a vehicle is higher due to higher idle speed, so that the non-uniform drivability of the vehicle is easily caused in the low-speed running process of the vehicle, even the phenomenon of abrupt acceleration occurs, and bad driving experience is brought to a user.

Disclosure of Invention

The application provides a control method and device of a hybrid power vehicle, a storage medium and the vehicle, which are used for solving the problems that the hybrid power vehicle is easy to generate abnormal acceleration and inconsistent driving feeling when running at a low speed under the condition of power battery failure.

In order to solve the problems, the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a hybrid vehicle control method, including:

under the condition that the occurrence of a preset fault of the power battery is detected, acquiring the current speed of the vehicle and/or the current residual capacity of the storage battery;

determining a target control strategy based on the current vehicle speed and the current residual electric quantity; the target control strategy is a control strategy aiming at an idle working condition of the engine;

and under the condition that the engine is detected to be in an idle working condition, controlling the idle speed of the engine and the working state of the storage battery according to the target control strategy.

In an embodiment of the present application, the step of determining the target control strategy based on the current vehicle speed and/or the current remaining power includes:

determining the target control strategy as a first control strategy in the case that the current vehicle speed is greater than or equal to a first vehicle speed threshold, or in the case that the current vehicle speed is less than a second vehicle speed threshold; the second vehicle speed threshold is smaller than the first vehicle speed threshold, and the first control strategy is a control strategy for high vehicle speed or parking conditions;

Determining the target control strategy as a second control strategy when the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is larger than or equal to a first electric quantity threshold; the second control strategy is a control strategy aiming at the condition of low vehicle speed and high electric quantity of the storage battery;

determining that the target control strategy is a third control strategy when the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold, and the current residual electric quantity is smaller than the first electric quantity threshold and larger than a second electric quantity threshold; the third control strategy is a control strategy aiming at the condition of low vehicle speed and medium electric quantity of the storage battery;

determining the target control strategy as a fourth control strategy when the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is smaller than or equal to the second electric quantity threshold; the fourth control strategy is directed to a control strategy in the case of low vehicle speed and low battery.

In an embodiment of the present application, the step of controlling the idle rotation speed of the engine and the operating state of the battery according to the target control strategy includes:

And under the condition that the target control strategy is the first control strategy, controlling the idle speed of the engine to be a first target idle speed, and controlling the engine driving motor to charge the storage battery.

Controlling the idle speed of the engine to be a second target idle speed and controlling the storage battery to be in a discharging state under the condition that the target control strategy is the second control strategy; the second target idle speed is less than the first target idle speed;

controlling the idle speed of the engine to be a third target idle speed and controlling the engine to drive the motor to charge the storage battery under the condition that the target control strategy is the third control strategy; the third target idle speed is greater than the second target idle speed and less than the first target idle speed.

Controlling the idle speed of the engine to be a fourth target idle speed and controlling the engine to drive the motor to charge the storage battery under the condition that the target control strategy is the fourth control strategy; the fourth target idle speed is greater than the third target idle speed and less than the first target idle speed.

In an embodiment of the present application, before the step of controlling the engine driving motor to charge the storage battery, the method further includes:

acquiring a current control mode of the motor;

and controlling the motor to switch from the current control mode to the voltage control mode under the condition that the current control mode is not the voltage control mode.

In one embodiment of the application, the motor is connected with the storage battery through a direct current voltage reduction module;

the step of controlling the engine driving motor to charge the storage battery includes:

determining a target power generation voltage of the motor as a first preset voltage;

and controlling the engine to drive the motor to output the first preset voltage to the direct-current voltage reduction module, and controlling the direct-current voltage reduction module to charge the storage battery based on the first preset voltage.

In an embodiment of the present application, the step of controlling the dc voltage reduction module to charge the storage battery based on the first preset voltage includes:

determining the output voltage of the direct current voltage reduction module as a second preset voltage; the second preset voltage is larger than a default charging voltage of the storage battery under the condition that the power battery does not have the preset fault;

And controlling the direct current voltage reduction module to carry out voltage reduction operation on the first preset voltage, and outputting the second preset voltage to charge the storage battery.

In an embodiment of the present application, the method further includes:

under the condition that the engine is detected to be in an idle working condition, correcting a default gear shifting interval of a transmission to obtain a target gear shifting interval; the gear shifting interval represents different gears corresponding to different vehicle speed intervals;

determining a target gear of the transmission based on the current vehicle speed and the target shift interval;

and switching the transmission to the target gear.

In a second aspect, based on the same inventive concept, an embodiment of the present application provides a hybrid vehicle control apparatus including:

the acquisition module is used for acquiring the current speed of the vehicle and/or the current residual capacity of the storage battery under the condition that the power battery is detected to have a preset fault;

the determining module is used for determining a target control strategy based on the current vehicle speed and the current residual electric quantity; the target control strategy is a control strategy aiming at an idle working condition of the engine;

and the control module is used for controlling the idle speed of the engine and the working state of the storage battery according to the target control strategy under the condition that the engine is detected to be in the idle working condition.

In one embodiment of the present application, the determining module includes:

a first strategy determination submodule, configured to determine the target control strategy as a first control strategy if the current vehicle speed is greater than or equal to a first vehicle speed threshold, or if the current vehicle speed is less than a second vehicle speed threshold; the second vehicle speed threshold is smaller than the first vehicle speed threshold, and the first control strategy is a control strategy for high vehicle speed or parking conditions; the method comprises the steps of carrying out a first treatment on the surface of the

A second strategy determining submodule, configured to determine the target control strategy as a second control strategy when the current vehicle speed is less than the first vehicle speed threshold and greater than or equal to the second vehicle speed threshold, and the current remaining power is greater than or equal to a first power threshold; the second control strategy is a control strategy aiming at the condition of low vehicle speed and high electric quantity of the storage battery;

a third strategy determining submodule, configured to determine that the target control strategy is a third control strategy when the current vehicle speed is less than the first vehicle speed threshold and greater than or equal to the second vehicle speed threshold, and the current remaining power is less than the first power threshold and greater than the second power threshold; the third control strategy is a control strategy aiming at the condition of low vehicle speed and medium electric quantity of the storage battery;

A fourth strategy determination submodule, configured to determine the target control strategy as a fourth control strategy when the current vehicle speed is less than the first vehicle speed threshold and greater than or equal to the second vehicle speed threshold, and the current remaining power is less than or equal to the second power threshold; the method comprises the steps of carrying out a first treatment on the surface of the The fourth control strategy is directed to a control strategy in the case of low vehicle speed and low battery.

In one embodiment of the present application, the control module includes:

and the first control sub-module is used for controlling the idle speed of the engine to be a first target idle speed and controlling the engine driving motor to charge the storage battery under the condition that the target control strategy is the first control strategy.

The second control sub-module is used for controlling the idle speed of the engine to be a second target idle speed and controlling the storage battery to be in a discharging state under the condition that the target control strategy is the second control strategy; the second target idle speed is less than the first target idle speed;

the third control sub-module is used for controlling the idle speed of the engine to be a third target idle speed and controlling the engine to drive the motor to charge the storage battery under the condition that the target control strategy is the third control strategy; the third target idle speed is greater than the second target idle speed and less than the first target idle speed.

A fourth control sub-module, configured to control an idle speed of the engine to a fourth target idle speed and control the engine to drive the motor to charge the battery, if the target control strategy is the fourth control strategy; the fourth target idle speed is greater than the third target idle speed and less than the first target idle speed.

In an embodiment of the present application, the hybrid vehicle control apparatus further includes:

the control mode acquisition module is used for acquiring the current control mode of the motor;

And the control mode switching module is used for controlling the motor to switch from the current control mode to the voltage control mode under the condition that the current control mode is not the voltage control mode.

In one embodiment of the application, the motor is connected with the storage battery through a direct current voltage reduction module; the control module further includes:

the power generation voltage determination submodule is used for determining the target power generation voltage of the motor to be a first preset voltage;

And the charging electronic module is used for controlling the engine to drive the motor to output the first preset voltage to the direct-current voltage reduction module and controlling the direct-current voltage reduction module to charge the storage battery based on the first preset voltage.

In an embodiment of the present application, the charging submodule includes:

the charging voltage determining unit is used for determining the output voltage of the direct current voltage reduction module to be a second preset voltage; the second preset voltage is larger than a default charging voltage of the storage battery under the condition that the power battery does not have the preset fault;

and the step-down charging unit is used for controlling the direct current step-down module to carry out step-down operation on the first preset voltage and outputting the second preset voltage to charge the storage battery.

the correction module is used for correcting a default gear shifting interval of the transmission to obtain a target gear shifting interval under the condition that the engine is detected to be in an idle working condition; the gear shifting interval represents different gears corresponding to different vehicle speed intervals;

the gear determining module is used for determining a target gear of the transmission based on the current vehicle speed and the target gear shifting interval;

And the gear switching module is used for switching the transmission to the target gear.

In a third aspect, based on the same inventive concept, an embodiment of the present application provides a storage medium having stored therein machine-executable instructions that when executed by a processor implement the hybrid vehicle control method set forth in the first aspect of the present application.

In a fourth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, including a processor and a memory, the memory storing machine executable instructions executable by the processor, the processor being configured to execute the machine executable instructions to implement the hybrid vehicle control method set forth in the first aspect of the present application.

Compared with the prior art, the application has the following advantages:

according to the hybrid power vehicle control method provided by the embodiment of the application, under the condition that the occurrence of the preset fault of the power battery is detected, the current speed of the vehicle and/or the current residual capacity of the storage battery are obtained; determining a target control strategy based on the current vehicle speed and the current residual electric quantity; and under the condition that the engine is detected to be in an idle working condition, controlling the idle speed of the engine and the working state of the storage battery according to a target control strategy. According to the embodiment of the application, under the condition that the power battery has preset faults, the current speed of the vehicle and the current residual capacity of the storage battery are comprehensively considered, and a proper target control strategy can be matched for the vehicle when the engine is in an idle working condition, so that the idle rotation speed of the engine and the working state of the storage battery are flexibly adjusted, the charging requirement of the storage battery can be effectively met, and meanwhile, the phenomenon that abnormal acceleration and inconsistent driving feeling of the vehicle are caused by the fact that the engine is always in a higher idle rotation speed is avoided, and the driving experience of a user is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram showing steps of a control method of a hybrid vehicle according to an embodiment of the present application.

Fig. 2 is a functional block diagram of a control device for a hybrid vehicle according to an embodiment of the present application.

Fig. 3 is a schematic view of a vehicle according to an embodiment of the present application.

Detailed Description

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

It should be noted that, after the power battery has serious fault and the high-voltage relay of the power battery is disconnected, the engine driving motor is controlled to directly supply power to the storage battery, but due to the motor characteristic, the motor rotation speed is required to be kept above a higher rotation speed, for example, the motor rotation speed is above 1500rpm to stably output high-voltage electricity, and accordingly, the idle rotation speed of the engine is required to be not lower than 1500rpm.

In the related art, in order to maintain stable power generation of the motor, the engine generally drives the motor to generate power at a high idle speed, however, the idle speed of the engine is high, which may give a bad driving feeling to the driver. For example, the minimum vehicle speed corresponding to the idle rotation speed of 1500rpm is only 16km/h, that is, when the vehicle needs to travel at a vehicle speed lower than 16km/h, it will be difficult to maintain stable travel of the vehicle in a low speed state, thereby causing inconsistent drivability of the vehicle and even a sudden acceleration phenomenon.

Aiming at the problem that abnormal acceleration and inconsistent driving feeling are easy to occur when the existing hybrid power vehicle runs at a low speed under the condition of power battery failure, the application aims to provide the control method of the hybrid power vehicle, and the current speed of the vehicle and the current residual capacity of the storage battery are comprehensively considered under the condition of preset failure of the power battery, so that a proper target control strategy can be matched, the idle speed of an engine and the working state of the storage battery are flexibly adjusted, the charging requirement of the storage battery can be effectively met, and the phenomenon that the abnormal acceleration and inconsistent driving feeling are caused when the engine is always at a higher idle speed is avoided, and the driving experience of a user is effectively improved. .

Referring to fig. 1, a hybrid vehicle control method of the present application is shown, which may include the steps of:

s101: and under the condition that the occurrence of the preset fault of the power battery is detected, acquiring the current speed of the vehicle and/or the current residual capacity of the storage battery.

It should be noted that, the execution body of the embodiment may be a computing service device having functions of data processing, network communication and program running, or an electronic device having the above functions, such as a driving computer, a vehicle-mounted computer, and the like. The execution body may be an HCU (Hydraulic Contro lUnit, hybrid vehicle controller). In the present embodiment, the HCU is used as an execution body, and the execution body of the vehicle is not particularly limited in this embodiment.

In this embodiment, the preset fault represents a high-level fault of the high-voltage relay that needs to be disconnected from the power battery, and specifically may include an over-temperature fault, a communication failure fault, a sealing insulation fault, and the like. It should be noted that, after the high-voltage relay is turned off, the power battery cannot supply electric power to the driving motor, and thus the engine is required to drive the vehicle independently, and the power battery cannot charge the storage battery by outputting the low voltage power through the low voltage terminal.

In this embodiment, the HCU is connected to the BMS (Battery Management System ), and real-time monitoring of the power battery fault state is implemented through the BMS to determine whether a preset fault occurs in the power battery. Specifically, after the BMS detects that the power battery has a preset fault, the BMS controls the high-voltage relay to be disconnected and simultaneously sends a fault code corresponding to the preset fault to the HCU, and the HCU analyzes the fault code to judge that the power battery has the preset fault.

In this embodiment, after detecting that a preset fault occurs in the power battery, the HCU obtains the current vehicle speed of the vehicle to determine whether the vehicle is in a low-speed driving condition; meanwhile, the HCU will also acquire the current SOC (State of charge) of the battery to determine whether the battery is sufficiently charged.

The storage battery is a low-voltage battery and is used for providing a working power supply for low-voltage equipment such as a low-voltage controller of the whole vehicle instead of the power battery when the power battery has preset faults.

S102: and determining a target control strategy based on the current vehicle speed and the current residual quantity.

It should be noted that the target control strategy is a control strategy for an idle condition of the engine. Specifically, it may be determined that the engine is in an idle condition when the accelerator pedal opening is detected to be zero. That is, when the engine is detected to be in an idle working condition, a target control strategy is triggered; and if the engine is not in the idle working condition, the target control strategy is not triggered.

In an embodiment, the HCU will match the vehicle with a suitable target control strategy from two dimensions, the current vehicle speed and the current remaining power.

For example, if after the engine is in idle condition, it is detected that the vehicle is running at low speed and the battery is sufficiently charged, then for that case, the HCU will match the control strategy for the low speed and battery high charge case; alternatively, when it is detected that the vehicle is running at a low speed and the battery is low, then for this case the HCU will match the control strategy in the case of low speed and low battery.

S103: and under the condition that the engine is detected to be in an idle working condition, controlling the idle speed of the engine and the working state of the storage battery according to a target control strategy.

In this embodiment, the HCU will trigger the target control strategy after detecting that the driver releases the accelerator pedal to achieve control over the idle speed of the engine and the operating state of the battery.

It should be noted that different target control strategies correspond to different idle speeds of the engine, and the working states of the storage battery specifically include a charging state and a discharging state. Wherein, in a charged state, the storage battery supplies power for low-voltage equipment of the vehicle; in the charged state, the battery will be charged by the engine-driven motor.

In one example, after the driver releases the accelerator pedal, the driver detects that the current speed of the vehicle is faster, and at the same time, the battery charge is higher, and then a target control strategy for the vehicle under the conditions of high speed and high battery charge can be matched, at this time, the engine can be controlled to be at a higher idle speed, and the battery can be charged more. With the continuous reduction of the current speed of the vehicle, after the vehicle is in a low-speed running working condition, a target control strategy aiming at the conditions of low speed and high electric quantity of the storage battery can be matched with the vehicle, at the moment, the engine is controlled to run at a lower idle speed, the working state of the storage battery is switched to a discharging state, and the engine runs at the lower idle speed at the moment, so that the vehicle can run more stably at the lower speed.

In this embodiment, when the power battery has a preset fault, the current speed of the vehicle and the current residual capacity of the storage battery are comprehensively considered, so that a proper target control strategy can be matched for the vehicle when the engine is in an idle working condition, the idle speed of the engine and the working state of the storage battery can be flexibly adjusted, the charging requirement of the storage battery can be effectively met, and meanwhile, the phenomenon that abnormal acceleration and inconsistent driving feeling of the vehicle are caused due to the fact that the engine is always in a higher idle speed is avoided, and the driving experience of a user is effectively improved.

In one possible implementation, S102 may specifically include the following sub-steps:

s102-1: and determining the target control strategy as the first control strategy in the case that the current vehicle speed is greater than or equal to the first vehicle speed threshold value or in the case that the current vehicle speed is less than the second vehicle speed threshold value.

In the present embodiment, the first control strategy is a control strategy for a high vehicle speed or a parking situation.

When the current vehicle speed is greater than or equal to the first vehicle speed threshold value, the vehicle is under a high vehicle speed running condition; and when the current vehicle speed is smaller than the second vehicle speed threshold value, indicating that the vehicle is in a parking state. Wherein the second vehicle speed threshold is smaller than the first vehicle speed threshold, for example, the first vehicle speed threshold may be set to 30km/h and the second vehicle speed threshold may be set to 2km/h.

In this embodiment, the HCU will specifically match the first control strategy for the vehicle for both cases, considering that the engine may be operated at a higher idle speed when the vehicle is at a high speed or in a stopped condition.

S102-2: and determining the target control strategy as a second control strategy under the condition that the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is larger than or equal to the first electric quantity threshold.

In the present embodiment, the second control strategy is a control strategy for a case where the vehicle speed is low and the battery is high.

In this embodiment, the first power threshold may be set to 70%. That is, when the current speed of 2km/h is less than or equal to 30km/h, the vehicle is under the running condition of low speed; when the current residual electric quantity is detected to be more than or equal to 70%, the storage battery is in a high electric quantity state.

In this embodiment, considering that the vehicle is at a low speed and the battery is at a high capacity, the HCU will purposely match the second control strategy for the vehicle in view of the fact that the battery is not in charge, but the idle speed of the engine needs to be limited.

S102-3: and determining the target control strategy as a third control strategy under the condition that the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is smaller than the first electric quantity threshold and larger than the second electric quantity threshold.

In the present embodiment, the third control strategy is a control strategy for a case of low vehicle speed and medium battery charge.

In this embodiment, the second electric quantity threshold may be set to 50%, that is, when the current vehicle speed is 2km/h or less and 30km/h is detected, it is indicated that the vehicle is in a low-vehicle-speed running condition; when 50% < the current remaining capacity < 70%, the storage battery is indicated to be in a medium state of charge.

In this embodiment, considering that the battery has a certain charging requirement when the vehicle is at a low speed and the battery is at a medium capacity, the idle rotation speed of the engine needs to be limited, and thus, the HCU will purposely match the third control strategy for the vehicle in the above situation.

S102-4: and determining the target control strategy as a fourth control strategy under the condition that the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is smaller than or equal to the second electric quantity threshold.

In the present embodiment, the fourth control strategy is a control strategy for a case where the vehicle speed is low and the battery is low.

In the implementation mode, when the current speed of the vehicle is less than or equal to 2km/h and less than 30km/h, the vehicle is under a low-speed running condition; and when the current residual electric quantity is detected to be less than 50%, the storage battery is in a low-electric-quantity state.

In this embodiment, considering that the battery has a strong charging demand when the vehicle is at a low speed and the battery is low, and the idle rotation speed of the engine needs to be limited, the HCU will specifically match the fourth control strategy for the vehicle in the above case.

In this embodiment, by comprehensively considering the current speed of the vehicle and the current residual capacity of the storage battery, the corresponding target control strategy can be pertinently matched for all possible working conditions of the vehicle, so that in the running process of the vehicle, the target control strategy can be flexibly switched along with the change of the current speed and the current residual capacity, and the driving requirements of users under various working conditions and the charging and discharging requirements of the storage battery are met.

In one possible implementation, S103 may specifically include the following sub-steps:

s103-1: and under the condition that the target control strategy is the first control strategy, controlling the idle speed of the engine to be the first target idle speed, and controlling the engine driving motor to charge the storage battery.

In the present embodiment, since the first control strategy is a control strategy for a high vehicle speed or a parking situation. Accordingly, the idle speed of the engine may be set to a larger first target idle speed, for example, the first target idle speed may be set to 1500rpm.

The first target idle rotation speed may be determined based on a charging rotation speed of the motor, wherein the charging rotation speed indicates a rotation speed at which power generation is possible. Specifically, in the case where the engine and the motor share the input shaft, the engine speed is the same as the motor speed, at which time the charging speed may be directly determined as the first target idle speed; in the case where a differential exists between the engine and the motor, the first target idle speed may be determined based on the charging speed and a corresponding speed ratio of the differential.

S103-2: and under the condition that the target control strategy is the second control strategy, controlling the idle speed of the engine to be the second target idle speed, and controlling the storage battery to be in a discharging state.

In the present embodiment, since the second control strategy is a control strategy for the case of a low vehicle speed and a high battery level. The storage battery is not required to be charged, and at the moment, the HCU controls the storage battery to be in a discharging state to supply power for low-voltage equipment of the vehicle; meanwhile, since the engine does not need to charge the battery by driving the motor, the HCU will control the motor in standby mode (i.e., ready state) without participating in the operation, and the idle speed of the engine is set to the second target idle speed that is smaller, for example, the second target idle speed may be set to 800rpm. That is, the second target idle speed < the first target idle speed.

S103-3: and under the condition that the target control strategy is the third control strategy, controlling the idle speed of the engine to be the third target idle speed, and controlling the engine driving motor to charge the storage battery.

In the present embodiment, since the third control strategy is a control strategy for a case of low vehicle speed and medium battery charge. That is, the storage battery has a certain charging requirement, and at this time, the HCU controls the engine driving motor to charge the storage battery so as to make the storage battery in a charging state; meanwhile, since the idle rotation speed of the engine needs to be limited at a low vehicle speed, the idle rotation speed of the engine is set to a third target idle rotation speed that is limited, for example, the third target idle rotation speed may be set to 1000rpm. That is, the second target idle speed < the third target idle speed < the first target idle speed.

S103-4: and under the condition that the target control strategy is the fourth control strategy, controlling the idle speed of the engine to be the fourth target idle speed, and controlling the engine driving motor to charge the storage battery.

In the present embodiment, the fourth control strategy is a control strategy for a case of low vehicle speed and medium battery charge. Namely, the storage battery has strong charging demand, and at the moment, the HCU controls the engine driving motor to charge the storage battery so as to enable the storage battery to be in a charging state; meanwhile, to meet the charge demand of the battery, the idle speed of the engine will be set to a fourth target idle speed that is less limited, for example, the fourth target idle speed may be set to 1400rpm. That is, the third target idle speed < the fourth target idle speed < the first target idle speed.

In this embodiment, by pertinently executing a corresponding target control strategy for all possible working conditions of the vehicle, the idle rotation speed of the engine can be adjusted while the charge and discharge requirements of the storage battery are met, so that the driving requirements of the user under various working conditions are effectively met, and further, the phenomenon that abnormal acceleration and inconsistent driving feel of the vehicle are caused by the fact that the engine is always at a higher idle rotation speed is effectively avoided, and the driving experience of the user is effectively improved.

In one possible embodiment, prior to the step of controlling the engine driving motor to charge the battery in S103-1, S103-3, and S103-4, the hybrid vehicle control method may specifically include the sub-steps of:

s201: the current control mode of the motor is obtained.

It should be noted that, in order to enable the motor to meet different use requirements, the same control mode will be set based on different uses of the motor. For example, when the motor is ISG (Integrated Starter andGenerator) or BSG (Belt-Driven Starter Generator) and the like, the power generation integrated machine is started, the motor has two functions of starting the engine and generating power. At this time, when the motor is used to start the engine, the motor needs to be switched to the torque control mode; when the motor is used for generating power, the motor needs to be switched to a voltage control mode. It should be noted that the motor may also have other control modes, such as a rotational speed control mode.

In this embodiment, in order to enable the motor to output a stable voltage to charge the battery when the battery is in charge, the HCU acquires the current control mode of the motor before controlling the motor to drive the motor to charge the battery, so as to determine whether the control mode needs to be switched.

S202: and when the current control mode is not the voltage control mode, controlling the motor to switch from the current control mode to the voltage control mode.

In a specific implementation, after detecting that the current control mode of the motor is not the voltage control mode, the HCU sends a mode switching request to the motor control, so that the motor control switches the motor from the current control mode to the voltage control mode in response to the mode switching request.

In the present embodiment, by switching the motor to the voltage control mode in advance, a more stable voltage can be output when the motor performs the charging operation, and stable charging of the battery can be further realized.

In one possible embodiment, the motor is connected with the storage battery through a direct-current voltage reduction module; the step of controlling the engine driving motor to charge the storage battery in S103-1, S103-3 and S103-4 may specifically include the following sub-steps:

s301: and determining the target power generation voltage of the motor as a first preset voltage.

In the present embodiment, the first preset voltage is obtained based on the motor characteristics of the motor, specifically, the maximum power generation voltage that the motor can stably output may be determined as the first preset voltage, which may be set to 360V, for example.

S302: and controlling the engine driving motor to output a first preset voltage to the direct-current voltage reduction module, and controlling the direct-current voltage reduction module to charge the storage battery based on the first preset voltage.

In this embodiment, the dc voltage reducing module may specifically be a DCDC module. Specifically, the voltage input end of the DCDC module is connected to the output end of the motor, and the voltage output end of the DCDC module is connected to the input end of the battery.

In a specific implementation, after the HCU switches the motor to the voltage control mode, the motor controller may control the motor to output a first preset voltage according to a preset PI (Proportiona lIntegral ) control strategy. Specifically, the motor controller acquires the actual voltage output by the motor in real time, and further performs PI adjustment based on the difference between the actual voltage and the first preset voltage, so as to stabilize the actual voltage output by the motor at the first preset voltage.

In this embodiment, the HCU performs the step-down operation by controlling the DCDC module, so that the first preset voltage can be reduced to a dc low voltage capable of charging the battery, and charging safety of the battery is ensured.

In a specific implementation, to improve the charging efficiency of the storage battery, the HCU determines the output voltage of the dc voltage reduction module to be a second preset voltage; and further controlling the direct current voltage reduction module to carry out voltage reduction operation on the first preset voltage, and outputting a second preset voltage to charge the storage battery.

It should be noted that the second preset voltage is greater than the default charging voltage of the storage battery in the case that the power battery does not have a preset fault. For example, in the case where the default charging voltage is 14.1V, the second preset voltage may be set to 14.8V.

Further, the second preset voltage may also be calculated based on the default charging voltage and a preset charging boost ratio. Specifically, let the charge boosting ratio be p, the second preset voltage=default charge voltage× (1+p). Wherein the charge efficiency ratio is a value greater than 1, which is used to represent the maximum ratio that allows the fluctuation of the charge voltage of the battery.

In this embodiment, through carrying out PI regulation to the motor to control direct current step-down module output second default voltage is battery charging, can effectively promote the charging efficiency of battery under the prerequisite of the safe charge of battery of guaranteeing.

In one possible embodiment, the hybrid vehicle control method may specifically include the sub-steps of:

s401: and under the condition that the engine is detected to be in an idle working condition, correcting a default gear shifting section of the transmission to obtain a target gear shifting section.

In this embodiment, in order to further ensure drivability under low-speed conditions of the vehicle, shift quality of the vehicle is improved. After detecting that the power battery has preset faults and the engine is in an idle working condition, the HCU corrects the default gear shifting section of the transmission, so that the target gear shifting section obtained after correction can meet the low-speed driving requirement of the vehicle more. The default gear shifting interval represents a gear shifting interval of the transmission under the condition that a power battery does not have a preset fault.

It should be noted that the shift interval represents different gears corresponding to different vehicle speed intervals. For example, the default shift interval may be: when the vehicle speed interval is [0,9], the gear of the transmission is 1 gear; the transmission gear is 2 when the vehicle speed interval is (9, 22), and the transmission gear is 3 when the vehicle speed interval is (22, 35), that is, the transmission gear is reduced from 3 to 2 when the current vehicle speed is lower than 22km/h, and the transmission gear is reduced from 2 to 1 when the current vehicle speed is lower than 9 km/h.

In a specific implementation, when the default shift section of the transmission is corrected, the upper limit value and the lower limit value in the vehicle speed section are adjusted upward. For example. The adjusted target shift interval may be: when the vehicle speed interval is [0, 12], the gear of the transmission is 1 gear; the transmission gear is 2 when the vehicle speed interval is (12, 25), and the transmission gear is 3 when the vehicle speed interval is (25, 40), that is, the transmission gear is reduced from 3 to 2 when the current vehicle speed is below 25km/h, and the transmission gear is reduced from 2 to 1 when the current vehicle speed is below 12 km/h.

S402: a target gear of the transmission is determined based on the current vehicle speed and the target shift interval.

In specific implementation, the current vehicle speed is compared with each vehicle speed interval in the target gear shifting interval, so that the target vehicle speed interval in which the current vehicle speed is positioned can be determined; and then the gear corresponding to the target vehicle speed section is determined as the target gear of the transmission.

S40: the transmission is shifted to the target gear.

In a specific implementation, after determining a target gear of the transmission, the HCU will send a shift command containing the target gear to the transmission controller to cause the transmission controller to shift the transmission to the target gear in response to the shift command.

In this embodiment, by correcting the default shift interval of the transmission and performing shift control according to the target shift interval, the vehicle can be shifted to a low gear in advance, and the transmission ratio of the transmission is increased, so that the engine can operate at a higher idle speed under the same condition, thereby better meeting the charging requirement of the storage battery and simultaneously better meeting the low-speed running requirement of the vehicle.

In this embodiment, when the power battery has a preset fault, by determining the current speed of the vehicle and the SOC value of the storage battery, a suitable target control strategy can be matched for the vehicle according to different current working conditions of the vehicle when the engine is in an idle working condition, so that parameters such as the idle speed of the engine, the motor control state, the working state of the storage battery, and the transmission gear can be flexibly adjusted. The automobile can effectively meet the charging requirement of the storage battery, and meanwhile, the phenomenon that abnormal acceleration and inconsistent driving feeling of the automobile are caused by the fact that the engine is always at a higher idle speed is avoided, so that the driving experience of a user is effectively improved.

In a second aspect, based on the same inventive concept, referring to fig. 2, an embodiment of the present application provides a hybrid vehicle control apparatus 200, the hybrid vehicle control apparatus 200 including:

an obtaining module 201, configured to obtain a current vehicle speed of the vehicle and/or a current remaining power of the storage battery when a preset failure of the power battery is detected;

a determining module 202, configured to determine a target control strategy based on a current vehicle speed and a current remaining power; the target control strategy is a control strategy aiming at the idle working condition of the engine;

and the control module 203 is used for controlling the idle speed of the engine and the working state of the storage battery according to a target control strategy under the condition that the engine is detected to be in an idle working condition.

In one embodiment of the present application, the determining module 202 includes:

the first strategy determination submodule is used for determining the target control strategy as the first control strategy under the condition that the current vehicle speed is greater than or equal to a first vehicle speed threshold value or the current vehicle speed is less than a second vehicle speed threshold value; the second vehicle speed threshold is smaller than the first vehicle speed threshold, and the first control strategy is a control strategy aiming at high vehicle speed or under the condition of parking;

The second strategy determining submodule is used for determining the target control strategy as a second control strategy under the condition that the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is larger than or equal to the first electric quantity threshold; the second control strategy is a control strategy aiming at the condition of low vehicle speed and high electric quantity of the storage battery;

the third strategy determining submodule is used for determining the target control strategy as a third control strategy under the condition that the current vehicle speed is smaller than the first vehicle speed threshold and larger than or equal to the second vehicle speed threshold and the current residual electric quantity is smaller than the first electric quantity threshold and larger than the second electric quantity threshold; the third control strategy is a control strategy aiming at the condition of low vehicle speed and medium electric quantity of the storage battery;

a fourth strategy determination submodule, configured to determine that the target control strategy is a fourth control strategy when the current vehicle speed is less than the first vehicle speed threshold and greater than or equal to the second vehicle speed threshold, and the current remaining power is less than or equal to the second power threshold; the fourth control strategy is directed to a control strategy in the case of low vehicle speed and low battery.

In one embodiment of the present application, the control module 203 includes:

The second control sub-module is used for controlling the idle speed of the engine to be a second target idle speed and controlling the storage battery to be in a discharging state under the condition that the target control strategy is a second control strategy; the second target idle speed is less than the first target idle speed;

the third control sub-module is used for controlling the idle speed of the engine to be a third target idle speed and controlling the engine driving motor to charge the storage battery under the condition that the target control strategy is the third control strategy; the third target idle speed is greater than the second target idle speed and less than the first target idle speed.

The fourth control sub-module is used for controlling the idle speed of the engine to be a fourth target idle speed and controlling the engine driving motor to charge the storage battery under the condition that the target control strategy is the fourth control strategy; the fourth target idle speed is greater than the third target idle speed and less than the first target idle speed.

In an embodiment of the present application, the hybrid vehicle control apparatus 200 further includes:

and when the current control mode is not the voltage control mode, controlling the motor to switch from the current control mode to the voltage control mode.

In one embodiment of the application, the motor is connected with the storage battery through a direct current voltage reduction module; the control module 203 further includes:

and the charging electronic module is used for controlling the engine driving motor to output a first preset voltage to the direct-current voltage reduction module and controlling the direct-current voltage reduction module to charge the storage battery based on the first preset voltage.

In one embodiment of the present application, a charging submodule includes:

the charging voltage determining unit is used for determining the output voltage of the direct current voltage reduction module as a second preset voltage; the second preset voltage is larger than a default charging voltage of the storage battery under the condition that the power battery does not have preset faults;

the step-down charging unit is used for controlling the direct current step-down module to carry out step-down operation on the first preset voltage and outputting the second preset voltage to charge the storage battery.

It should be noted that, the specific implementation of the hybrid vehicle control device 200 according to the embodiment of the present application refers to the specific implementation of the hybrid vehicle control method set forth in the first aspect of the embodiment of the present application, and will not be described herein.

In a third aspect, based on the same inventive concept, an embodiment of the present application provides a storage medium having stored therein machine executable instructions that when executed by a processor implement the hybrid vehicle control method set forth in the first aspect of the present application.

It should be noted that, the specific implementation of the storage medium according to the embodiment of the present application refers to the specific implementation of the hybrid vehicle control method set forth in the first aspect of the present application, and will not be described herein.

In a third aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle 300 including a processor 301 and a memory 302; the memory 302 stores machine executable instructions executable by the processor 301, the processor 301 being configured to execute the machine executable instructions to implement the hybrid vehicle control method according to the first aspect of the present application.

It should be noted that, the specific implementation of the vehicle 300 according to the embodiment of the present application refers to the specific implementation of the hybrid vehicle control method set forth in the first aspect of the present application, and will not be described herein.

It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.

The above description of the hybrid vehicle control method, device, storage medium and vehicle provided by the present invention applies specific examples to illustrate the principles and embodiments of the present invention, and the above examples are only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. A hybrid vehicle control method, characterized by comprising:

2. The hybrid vehicle control method according to claim 1, characterized in that the step of determining a target control strategy based on the current vehicle speed and/or the current remaining power includes:

3. The method according to claim 2, characterized in that the step of controlling the idle rotation speed of the engine and the operating state of the battery in accordance with the target control strategy includes:

Controlling the idle speed of the engine to be a first target idle speed and controlling the engine driving motor to charge the storage battery under the condition that the target control strategy is the first control strategy;

4. The method of controlling a hybrid vehicle according to claim 3, characterized in that, before the step of controlling the engine-driven motor to charge the battery, the method further comprises:

acquiring a current control mode of the motor;

5. The control method of a hybrid vehicle according to claim 3, characterized in that the motor is connected to the battery through a direct-current step-down module;

6. The method according to claim 5, characterized in that the step of controlling the dc step-down module to charge the battery based on the first preset voltage includes:

7. The hybrid vehicle control method according to claim 1, characterized in that the method further comprises:

and switching the transmission to the target gear.

8. A hybrid vehicle control apparatus, characterized by comprising:

9. A storage medium having stored therein machine executable instructions that when executed by a processor implement the hybrid vehicle control method of any one of claims 1-7.

10. A vehicle comprising a processor and a memory, the memory storing machine executable instructions executable by the processor for executing the machine executable instructions to implement the hybrid vehicle control method of any of claims 1-7.