A vehicle control method and apparatus

Abstract

The application discloses a vehicle control method and device, relates to the technical field of vehicle engineering, and improves the power deficiency of a vehicle under extreme working conditions. When the vehicle is a fuel vehicle, the method comprises the following steps: when a preset short-time torque release mode in the vehicle is in an activated state, acquiring a current required torque Q2 of the vehicle and a maximum torque Q3 marked on an external characteristic curve of an engine; judging whether the torque Q2 is greater than the maximum torque Q3, if yes, controlling the engine to operate according to a torque Q4, and monitoring the time for which the engine continuously operates according to the torque Q4; when the time reaches a preset time T1, controlling the engine to return to an original torque output state; wherein the torque Q1 is the maximum torque that the engine is allowed to continuously output within the time T1, and the value of the torque Q1 is greater than the maximum torque Q3; and the torque Q4 is the minimum value of the torque Q1 and the torque Q2.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle engineering, and in particular to a vehicle control method and device. BACKGROUND

[0002] In industrial transportation and engineering operations, vehicles (such as mine trucks, heavy engineering vehicles, etc.) often face extreme working conditions, such as mine trucks climbing heavy loads in mines, heavy engineering vehicles sinking in muddy road sections, etc. At this time, even if the power system carried by the vehicle is running at full capacity and reaches the maximum power value allowed by the external characteristic curve (calibration curve) of the power system, it is still difficult to meet the power demand under extreme working conditions. SUMMARY

[0003] In view of the above problems, the present application provides a vehicle control method and device to improve the power shortage of the vehicle under extreme working conditions. The specific scheme is as follows:

[0004] The first aspect of the present application provides a vehicle control method, the vehicle is a fuel vehicle, and the method comprises:

[0005] When a short-time torque release mode preset in the vehicle is in an activated state, the torque Q2 currently required by the vehicle and the maximum torque Q3 calibrated on the external characteristic curve of the engine are obtained;

[0006] It is judged whether the torque Q2 is greater than the maximum torque Q3, if yes, the engine is controlled to operate according to the torque Q4, and the time for which the engine continuously operates according to the torque Q4 is monitored; when the time reaches a preset time T1, the engine is controlled to return to the original torque output state;

[0007] Wherein, the torque Q1 is the maximum torque allowed to be continuously output by the engine within the time T1, and its value is greater than the maximum torque Q3; the torque Q4 is the minimum value of the torque Q1 and the torque Q2.

[0008] In a possible implementation, before the engine is controlled to operate according to the torque Q4, the method further comprises: controlling the vehicle to send a prompt information.

[0009] In a possible implementation, after the engine is controlled to operate according to the torque Q4, the method further comprises: when a first command issued by a user is received, directly controlling the engine to return to the original torque output state and maintaining the short-time torque release mode in the activated state.

[0010] In a possible implementation, the method further comprises:

[0011] When the economy promotion mode preset in the vehicle is in an activated state, it is determined whether the current engine speed is greater than the rated speed N1, and if so, it is determined whether the state that the current engine speed is greater than the rated speed N1 lasts for more than a preset time T3;

[0012] If the time T3 is exceeded, the current power demand of the vehicle P8 is calculated, and the maximum power P9 that the vehicle can output when the engine operates at a preset speed N2 is calculated; the speed N2 is not greater than the speed N1;

[0013] If the power P9 is not less than the power P8, the vehicle is controlled to issue a prompt message, and the engine is controlled to operate at the speed N2.

[0014] The second aspect of the application provides another vehicle control method, the vehicle being a range-extended electric vehicle, and the method comprising:

[0015] When the short-time power release mode preset in the vehicle is in an activated state, the current power demand of the vehicle P2 and the maximum power P3 marked on the external characteristic curve of the motor are obtained;

[0016] It is determined whether the power P2 is greater than the maximum power P3, and if so, the motor is controlled to operate at a power P4, and the time for which the motor continuously operates at the power P4 is monitored; when the time reaches a preset time T2, the motor is controlled to return to the original power output state;

[0017] The power P1 is the maximum power that the motor is allowed to continuously output within the time T2, and the value is greater than the maximum power P3; the power P4 is the minimum value of the power P1 and the power P2.

[0018] In a possible implementation, before the motor is controlled to operate at the power P4, the vehicle is further controlled to issue a prompt message.

[0019] In a possible implementation, after the motor is controlled to operate at the power P4, when a third command issued by a user is received, the motor is directly controlled to return to the original power output state, and the short-time power release mode is maintained in the activated state.

[0020] The third aspect of the application provides a vehicle control device, the vehicle being a fuel vehicle, and the device comprising:

[0021] The first condition determination unit is configured to, when the short-time torque release mode preset in the vehicle is in an activated state, obtain the current torque demand of the vehicle Q2 and the maximum torque Q3 marked on the external characteristic curve of the engine; and determine whether the torque Q2 is greater than the maximum torque Q3.

[0022] A short-time torque enhancement unit is configured to control the engine to operate according to a torque Q4 when the torque Q2 is greater than the maximum torque Q3, and monitor the time during which the engine operates according to the torque Q4; when the time reaches a preset time T1, control the engine to return to the original torque output state;

[0023] wherein the torque Q1 is the maximum torque allowed to be continuously output by the engine within the time T1, and the value of the torque Q1 is greater than the maximum torque Q3; the torque Q4 is the minimum value between the torque Q1 and the torque Q2.

[0024] In a possible implementation, the device further comprises:

[0025] A second condition judging unit is configured to determine whether the current engine speed is greater than a rated speed N1 when an economy improvement mode preset in the vehicle is in an activated state; if yes, determine whether the state that the current engine speed is greater than the rated speed N1 lasts for more than a preset time T3; if yes, calculate the current power demand P8 of the vehicle, and calculate the maximum power P9 that can be output by the vehicle when the engine operates at a preset speed N2; the speed N2 is not greater than the speed N1.

[0026] An economy improvement unit is configured to control the vehicle to issue a prompt information and control the engine to operate at the speed N2 when the power P9 is not less than the power P8.

[0027] The fourth aspect of the present application provides still another vehicle control device, the vehicle being a range-extended electric vehicle, and the device comprising:

[0028] A third condition judging unit is configured to acquire the current power demand P2 of the vehicle and the maximum power P3 marked on an external characteristic curve of the motor when a short-time power release mode preset in the vehicle is in an activated state, and determine whether the power P2 is greater than the maximum power P3.

[0029] A short-time power enhancement unit is configured to control the motor to operate according to a power P4 when the power P2 is greater than the maximum power P3, and monitor the time during which the motor operates according to the power P4; when the time reaches a preset time T2, control the motor to return to the original power output state.

[0030] wherein the power P1 is the maximum power allowed to be continuously output by the motor within the time T2, and the value of the power P1 is greater than the maximum power P3; the power P4 is the minimum value between the power P1 and the power P2.

[0031] By the above technical solution, when the current power demand of the vehicle exceeds the maximum power value allowed by the external characteristic curve of the power system, the power system is controlled to break through the limit of the external characteristic curve, and a stronger power relative to the maximum power value is released. The time for which the power is continuously released should be relatively short, and the power cannot exceed the maximum power value allowed by the power system to be continuously released in a short time, so that the power demand of the vehicle in an extreme working condition is met without causing damage to the hardware of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and other features, advantages, and aspects of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the proportions of the elements and the sizes are not necessarily drawn to scale.

[0033] Figure 1 A vehicle control method flowchart provided by the present application;

[0034] Figure 2 Another vehicle control method flowchart provided by the present application;

[0035] Figure 3 Another vehicle control method flowchart provided by the present application. DETAILED DESCRIPTION

[0036] When the vehicle faces some extreme working conditions, even if the power system carried by the vehicle is running at full capacity and reaches the maximum power value (i.e., the maximum power value allowed by the external characteristic curve of the power system) that can be continuously output in a long-time stable running working condition (i.e., a conventional working condition), it is still difficult to meet the power demand in the extreme working condition. To solve the problem of insufficient power of the vehicle in the extreme working condition, the present application provides a vehicle control method, which adopts a short-time power enhancement mechanism, i.e., when the current power demand of the vehicle exceeds the maximum power value allowed by the external characteristic curve of the power system, the power system is controlled to break through the limit of the external characteristic curve, and a stronger power relative to the maximum power value is released. The time for which the power is continuously released should be relatively short, and the power cannot exceed the maximum power value allowed by the power system to be continuously released in a short time, so that the power demand of the vehicle in an extreme working condition is met without causing damage to the hardware of the power system.

[0037] Next, a vehicle control method provided by an embodiment of the present application will be described in conjunction with the accompanying drawings. Those skilled in the art can know that the technical solution provided by the embodiment of the present application is also applicable to similar technical problems as the technology develops and new scenarios appear.

[0038] The terms "first", "second", and the like in the description and in the claims of the present application and in the above figures are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the present application are capable of functioning in other sequences, except where it is inherent from the procedure or context. Moreover, the terms "comprise", "have" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, has or includes a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] Referring to Figure 1 For a traditional fuel vehicle (the power system of the traditional fuel vehicle is referred to as a traditional fuel power system, which takes an engine as a core component), a vehicle control method provided by an embodiment of the present application specifically includes the following steps.

[0040] Step S01: When a short-time torque release mode preset in the vehicle is in an activated state, a current required torque Q2 of the vehicle and a maximum torque Q3 marked on an external characteristic curve of the engine are acquired, and then step S02 is entered.

[0041] Specifically, the driver can autonomously activate the short-time torque release mode (i.e., a short-time power enhancement mechanism applicable to the traditional fuel vehicle) preset in the vehicle after the vehicle is started and runs. Once the vehicle subsequently encounters an extreme working condition, the system can automatically and quickly enable the short-time power enhancement mechanism. The way in which the driver activates the short-time torque release mode can be, but is not limited to, operating a specific button, issuing a voice instruction, or operating a touch screen.

[0042] The external characteristic curve of the engine refers to a curve of performance parameters such as power, torque, and fuel consumption of the engine varying with the speed when the engine is under full load. The curve reflects the performance of the engine under the optimal working condition, including the maximum power, the maximum torque Q3, and the corresponding speed. The external characteristic curve of the engine is usually accurately marked by the engine manufacturer according to the design parameters of the engine, the material characteristics, and a large amount of test data, so as to ensure that the engine can safely and stably output the corresponding torque under long-time stable running conditions in the entire service life. In the existing vehicle development process, the output torque of the engine is limited to not exceeding the maximum torque Q3 marked on the external characteristic curve of the engine, so as to ensure that the engine runs in a safe, stable, and efficient state.

[0043] Step S02: It is judged whether the torque Q2 is greater than the maximum torque Q3. If yes, step S03 is entered; if no, step S01 is returned.

[0044] Step S03: controlling the engine to operate according to the torque Q4, and monitoring the time for which the engine continuously operates according to the torque Q4; when the time reaches a preset time T1, controlling the engine to return to the original torque output state, and then returning to step S01; wherein the torque Q1 is the maximum torque that the engine is allowed to continuously output within the time T1, Q1>Q3, and Q4=min(Q1, Q2).

[0045] Specifically, when the torque Q2 currently required by the whole vehicle is greater than the maximum torque Q3 marked on the external characteristic curve of the engine, it indicates that the vehicle currently faces an extreme working condition of power deficiency. In this extreme working condition, if the torque is still output according to the external characteristic curve of the engine (i.e., the torque is output according to the maximum torque Q3), the power requirement in the extreme working condition cannot be met.

[0046] To this end, the embodiment of the present application gives the engine a short-time power enhancement capability in the extreme working condition, i.e., allows the engine to break through the limit of the external characteristic curve and continuously output the maximum torque Q1 higher than Q3 within a short time (e.g., within 60 seconds, i.e., T1≤60 seconds). As long as the value of the torque Q1 and the continuous output time are set reasonably, the engine hardware will not be damaged. The torque Q1 is the maximum short-time output torque allowed by the engine, and the actual output torque Q4 of the engine in the extreme working condition takes the minimum value between the torque Q1 and the torque Q2, so that the vehicle obtains the best power performance under the current hardware and safety constraints, and the problem of power deficiency in the extreme working condition is maximally alleviated.

[0047] In summary, the embodiment of the present application gives the engine a short-time power enhancement mechanism, aiming to enable it to efficiently cope with extreme working conditions that require short-time powerful power. When the vehicle faces such working conditions, the mechanism can help the vehicle fully tap the stronger power potential of the engine, especially a large-displacement engine, thereby avoiding low work efficiency due to power deficiency in some extreme working conditions.

[0048] In a possible implementation, the control of the engine to return to the original torque output state mentioned in any of the above embodiments can specifically include: controlling the engine to gradually return (e.g., to reduce the torque in steps, such as reducing 50 N.m every 10 seconds) to the original torque output state, so as to avoid impact on the internal mechanical parts of the engine due to sudden change of the torque, reduce the risk of wear and tear, guarantee the reliability and durability of the engine, and at the same time, enable smooth transition of the power of the vehicle, improve the driving comfort, prevent the vehicle from appearing jerky due to sudden change of power, and affect the driving stability.

[0049] In a possible implementation, any of the above embodiments can further include, before performing the short-time power enhancement (i.e., controlling the engine to operate according to the torque Q4), controlling the vehicle to send a prompt to remind the driver, so that the driver is aware of the change in the state of the vehicle in advance, and is prepared for the corresponding driving, thereby improving the driving safety. The prompt can be presented in various ways, such as a bright orange indicator light on the instrument panel, accompanied by a brief and clear "short-time power enhancement is about to start" text prompt; or a clear voice prompt played by the in-vehicle audio system, informing the driver that "short-time power enhancement is about to start".

[0050] In a possible implementation, any of the above embodiments can further include, after controlling the engine to operate according to the torque Q4, directly controlling the engine to return to the original power output state and maintaining the short-time power release mode in the activated state when a first command issued by the user (i.e., the driver intervenes, such as reducing the accelerator, to forcibly end the short-time power enhancement) is received, so that the system can respond quickly when the vehicle encounters extreme working conditions again in the future.

[0051] In a possible implementation, any of the above embodiments can further include, in the case where the short-time power release mode is in the activated state, exiting the short-time power release mode when a second command issued by the user is received, thereby enabling the user to control the start and stop of the mode.

[0052] Referring to Figure 2 For a range-extended electric vehicle (the power system of the range-extended electric vehicle is referred to as a range-extended electric power system, which has an engine and a motor as core components; the engine is used only as a range extender to provide power for the motor by burning fuel, and the motor converts mechanical energy into electrical energy and stores the electrical energy in a battery or directly drives the vehicle; the vehicle is completely driven by the motor, and the engine does not directly participate in driving the wheels), a vehicle control method provided in the embodiments of the present application specifically includes the following steps:

[0053] Step S11: When a short-time power release mode preset in the vehicle is in an activated state, obtaining a current demand power P2 of the vehicle and a maximum power P3 marked on an external characteristic curve of the motor, and then proceeding to step S12.

[0054] Step S12: Determining whether the power P2 is greater than the maximum power P3, if yes, proceeding to step S13; if no, returning to step S11.

[0055] Step S13: Controlling the motor to operate according to the power P4 and monitoring the time for which the motor continuously operates according to the power P4; when the time reaches a preset time T2, controlling the motor to return to the original power output state, and then returning to step S11; wherein the power P1 is the maximum power that the motor is allowed to continuously output within the time T2, P1>P3, and P4=min(P1, P2).

[0056] Specifically, the short-time power enhancement mechanism can be applied not only to traditional fuel vehicles but also to extended-range electric vehicles. After the vehicle is started and runs, the driver can activate the short-time power release mode (i.e., the short-time power enhancement mechanism applicable to extended-range electric vehicles) preset in the vehicle. Once the vehicle subsequently encounters an extreme working condition, the short-time power enhancement mechanism can be automatically and quickly enabled.

[0057] The external characteristic curve of the motor refers to the relationship curve between the power, torque, and speed of the motor when the motor is running at full load. The external characteristic curve of the motor is usually accurately calibrated by the motor manufacturer. In the existing vehicle development process, the motor output power is usually limited to not exceeding the maximum power P3 calibrated on the external characteristic curve of the motor, to ensure that the extended-range electric power system runs in a safe, stable, and efficient state.

[0058] When the current demand power P2 of the vehicle is greater than the maximum power P3 calibrated on the external characteristic curve of the motor, it indicates that the vehicle currently faces an extreme working condition of power deficiency. In this extreme working condition, if the power is still output according to the external characteristic curve of the motor (i.e., the maximum power P3 is output), the power demand in the extreme working condition cannot be met.

[0059] To this end, the embodiment of the present application gives the motor a short-time power enhancement capability in the extreme working condition, i.e., allows the motor to break through the limit of the external characteristic curve and continuously output the maximum power P1 higher than P3 within a short time T2 (e.g., within 60 seconds, i.e., T2≤60 seconds). As long as the value of the power P1 and the continuous output time are set reasonably, the extended-range electric power system hardware will not be damaged. The power P1 is the short-time maximum output power allowed by the motor, and the actual output power P4 of the motor in the extreme working condition is the minimum value of the power P1 and the power P2, so that the vehicle obtains the best power performance under the current hardware and safety constraints, and the problem of power deficiency in the extreme working condition is maximally alleviated.

[0060] In summary, Figure 2 The embodiment shown gives the extended-range electric power system a short-time power enhancement mechanism, aiming to enable it to efficiently cope with extreme working conditions that require short-time strong power. When the vehicle faces such working conditions, the mechanism can help the vehicle fully tap the stronger power potential of the extended-range electric power system, especially the extended-range electric power system with a large-displacement engine and a motor as core components, to avoid low work efficiency due to power deficiency in some extreme working conditions.

[0061] In a possible implementation, in any of the above embodiments provided for the extended-range electric vehicle, the control of the motor to restore to the original power output state can specifically include: controlling the motor to gradually restore (e.g., reduce power in steps, such as reducing 20 kW every 10 seconds) to the original power output state.

[0062] In a possible implementation, any of the above embodiments provided for the extended-range electric vehicle can further include: before the short-time power enhancement (i.e., the motor is controlled to operate at the power P4), the vehicle sends a prompt message to remind the driver, so that the driver is aware of the change in the state of the vehicle in advance and makes corresponding driving preparations, thereby improving driving safety and controllability. The prompt message can be presented in various ways, such as a prominent orange indicator light on the instrument panel, accompanied by a simple and clear "short-time power enhancement is about to start" text prompt; or the in-vehicle audio system plays a clear voice prompt to inform the driver that "short-time power enhancement is about to start".

[0063] In a possible implementation, any of the above embodiments provided for the extended-range electric vehicle can further include: after the motor is controlled to operate at the power P4, when a third command issued by the user (i.e., the driver intervenes, such as reducing the accelerator, to forcibly end the short-time power enhancement) is received, the motor is directly controlled to restore to the original power output state, and the short-time power release mode is maintained in the activated state, so that the system can respond quickly when the vehicle encounters extreme working conditions again in the future.

[0064] In a possible implementation, any of the above embodiments provided for the extended-range electric vehicle can further include: when a fourth command issued by the user is received, the short-time power release mode is exited, thereby enabling the user to control the start and stop of the mode.

[0065] The above embodiments short-time improve the power performance of the traditional fuel vehicle or the extended-range electric vehicle in extreme working conditions. In addition, fuel economy is also one of the focuses of the vehicle. Compared with the traditional fuel vehicle, the extended-range electric vehicle generally has higher fuel economy, because:

[0066] Based on the characteristic curve of the engine, the fuel economy of the engine in different speed and torque combination working conditions is different. There is an economic operation interval in the operating condition range of the engine, which is usually located in the low-speed section. When the engine is in the high-speed section, the fuel consumption per unit time increases significantly.

[0067] In the extended-range electric vehicle, the main function of the engine is to provide electric energy for the motor, rather than directly driving the vehicle. Therefore, the working point of the engine can be designed relatively fixedly in the economic operation interval, to ensure that the engine operates in the most economical way.

[0068] In contrast, the engine of a traditional fuel vehicle directly drives the wheels and needs to operate under various complex working conditions, including starting, accelerating, cruising, climbing and overtaking. This makes it difficult for the engine to always remain in the economic operating range, and therefore the fuel economy of the engine of a traditional fuel vehicle is poor in actual operation.

[0069] The poor fuel economy of a traditional fuel vehicle is particularly prominent in a mine truck. The mine truck often needs to frequently perform heavy load climbing and unloading operations in mine operations, and these working conditions have very high requirements for the power performance of the vehicle. In order to ensure the power output of the mine truck under complex road conditions, the driver is used to long-term full throttle operation. However, this operation mode, although ensuring the power performance of the mine truck, also brings the following problems: long-term full throttle operation makes the engine run at a high speed above the rated speed N1 (i.e. a high speed greater than the rated speed N1; the rated speed N1 of the engine is the speed value corresponding to the maximum power of the engine), deviating from the efficient operating range of the engine, and the fuel economy is extremely poor; for a mine truck equipped with a large displacement engine, in most daily operation scenarios, the transportation task can be easily completed without full throttle (i.e. without running at a high speed). Therefore, long-term full throttle operation will cause a large amount of unnecessary fuel waste.

[0070] In this regard, any of the above embodiments provided for a traditional fuel vehicle can also preset an economy improvement mode for the vehicle. The driver can activate the economy improvement mode autonomously after the vehicle is started and operated. Once the vehicle meets the condition that "on the premise of guaranteeing the power demand of the vehicle, the economic operating range can be entered by shifting up and reducing the speed" in subsequent operation, the system can quickly take corresponding measures to optimize the operating conditions of the engine, thereby improving the fuel economy.

[0071] Specifically, referring to Figure 3 Any of the above embodiments provided for a traditional fuel vehicle can also include:

[0072] Step S21: When the economy improvement mode preset in the vehicle is in the activated state, it is judged whether the current speed of the engine is greater than the rated speed N1, if yes, step S22 is entered; if no, step S21 is returned.

[0073] Step S22: It is judged whether the time during which the current speed of the engine is greater than the rated speed N1 exceeds the pre-set time T3, if yes, step S23 is entered; if no, step S21 is returned.

[0074] Step S23: calculate the current demand of the vehicle power P8, and the maximum power P9 that the vehicle can output when the engine runs at a pre-set speed N2; N2≤N1; if P9≥P8, control the vehicle to send a prompt information, and control the engine to run at speed N2, then return to step S21.

[0075] Specifically, if the current engine speed is greater than the rated speed N1 for more than a pre-set time T3 (such as 60 seconds), it means that the engine is in a high speed section that is not accidental, higher than the rated speed N1, deviating from the economic operation zone. In this case, if the maximum power P9 that the vehicle can output when the engine runs at speed N2 (N2≤N1) is greater than the current demand of the vehicle power P8, it means that the vehicle has the condition of "entering the economic operation zone by shifting up and reducing the speed under the premise of guaranteeing the power demand of the vehicle". Wherein, N2 is a speed calibration value specially set after comprehensively considering the actual transportation road conditions of the mining area, the actual driving speed of the vehicle, and the weight of the loaded goods and other factors; different road conditions, vehicle speed sections and load sections will correspond to different N2 values, such as designing a smaller N2 when the road condition is gentle, the vehicle speed and load are low, and designing a larger N2 when the road slope is large, the vehicle speed and load are high.

[0076] Under the condition that the vehicle has this condition, control the vehicle to send a prompt information to remind the driver that the engine speed adjustment is about to be performed, and the driver needs to cooperate with the gear adjustment. Then, control the engine to run at speed N2, forcing the driver to shift up (if not, the vehicle speed will be reduced, which does not meet the current driving demand of the driver), thereby achieving the purpose of shifting up and reducing the speed, and making the engine run into the economic operation zone.

[0077] Through the upshift operation, the transmission ratio of the transmission changes (the transmission ratio of the transmission refers to the ratio of the engine speed to the wheel speed. The upshift operation will make the transmission ratio smaller, and the downshift operation will make the transmission ratio larger. Since the wheel speed is positively correlated with the vehicle speed, the upshift operation means that the engine speed is relatively reduced compared with the vehicle speed), in the case that the vehicle speed is basically maintained or slightly improved (under the condition that the driving resistance and transmission loss are basically unchanged, the vehicle speed is basically positively correlated with the engine power), the engine speed is reduced, thereby making the engine enter the economic operation zone from the high speed region; at this time, the fuel injection amount of the engine is reduced, and the mechanical friction loss is also reduced, thereby improving the fuel economy. The present application first reduces the speed of the motor and then forces the driver to shift up, which can guide the driver to form a driving habit that is more in line with the efficient operation of the vehicle, which is helpful to prolong the service life of the vehicle and save energy in the long run.

[0078] Corresponding to the above method embodiments for traditional fuel vehicles, the embodiments of the present application also provide a vehicle control device, comprising:

[0079] a first condition judging unit, configured to, when a short-time torque release mode preset in the vehicle is in an activated state, acquire a current required torque Q2 of the vehicle and a maximum torque Q3 marked on an external characteristic curve of the engine; and judge whether the torque Q2 is greater than the maximum torque Q3;

[0080] a short-time torque enhancement unit, configured to, when the torque Q2 is greater than the maximum torque Q3, control the engine to operate according to a torque Q4, and monitor a time for which the engine continuously operates according to the torque Q4; and when the time reaches a preset time T1, control the engine to return to an original torque output state;

[0081] wherein the torque Q1 is a maximum torque allowed to be continuously output by the engine within the time T1, and the value of the torque Q1 is greater than the maximum torque Q3; and the torque Q4 is a minimum value of the torque Q1 and the torque Q2.

[0082] In a possible implementation, the vehicle control device further comprises:

[0083] a second condition judging unit, configured to, when an economy improvement mode preset in the vehicle is in an activated state, judge whether a current engine speed is greater than a rated speed N1, and if so, judge whether a time for which the current engine speed is greater than the rated speed N1 exceeds a preset time T3; and if so, calculate a current required power P8 of the vehicle, and calculate a maximum power P9 that can be output by the vehicle when the engine operates at a preset speed N2; and the speed N2 is not greater than the speed N1.

[0084] an economy improvement unit, configured to, when the power P9 is not less than the power P8, control the vehicle to issue a prompt information, and control the engine to operate at the speed N2.

[0085] Corresponding to the above method embodiments for extended-range electric vehicles, the embodiments of the present application also provide a vehicle control device, comprising:

[0086] a third condition judging unit, configured to, when a short-time power release mode preset in the vehicle is in an activated state, acquire a current required power P2 of the vehicle and a maximum power P3 marked on an external characteristic curve of the motor; and judge whether the power P2 is greater than the maximum power P3.

[0087] A short-time power enhancement unit is configured to control the motor to operate at a power P4 when the power P2 is greater than the maximum power P3, and monitor a time duration that the motor operates at the power P4; and control the motor to return to the original power output state when the time duration reaches a preset time T2.

[0088] wherein the power P1 is a maximum power allowed to be continuously output by the motor within the time T2, and the power P1 is greater than the maximum power P3; and the power P4 is a minimum value between the power P1 and the power P2.

[0089] The electronic device provided in the embodiments of the present application includes at least one processor and a memory connected to the processor, wherein:

[0090] The memory is configured to store a computer program.

[0091] The processor is configured to execute the computer program, so that the electronic device can implement any of the vehicle control methods provided in the embodiments of the present application.

[0092] The embodiments of the present application also provide a computer program product including computer readable instructions, which, when executed on an electronic device, enable the electronic device to implement any of the vehicle control methods provided in the embodiments of the present application.

[0093] The embodiments of the present application also provide a computer readable storage medium, which carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement any of the vehicle control methods provided in the embodiments of the present application.

[0094] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present application. Therefore, the embodiments of the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle control method characterized by, The vehicle is a fuel vehicle, and the method comprises: When a preset short-time torque release mode in the vehicle is in an activated state, a current required torque Q2 of the vehicle and a maximum torque Q3 marked on an external characteristic curve of the engine are obtained; It is judged whether the torque Q2 is greater than the maximum torque Q3, and if yes, the engine is controlled to operate according to a torque Q4, and the time for which the engine continuously operates according to the torque Q4 is monitored; when the time reaches a preset time T1, the engine is controlled to return to an original torque output state; Wherein, the torque Q1 is a maximum torque allowed to be continuously output by the engine within the time T1, and the value thereof is greater than the maximum torque Q3; the torque Q4 is the minimum value between the torque Q1 and the torque Q2; When a preset economy improvement mode in the vehicle is in an activated state, it is judged whether a current engine speed is greater than a rated speed N1, and if yes, it is judged whether the time for which the engine speed is greater than the rated speed N1 exceeds a preset time T3; If the time T3 is exceeded, a current required power P8 of the vehicle is calculated, and a maximum power P9 that can be output by the vehicle when the engine operates at a preset speed N2 is calculated; the speed N2 is not greater than the speed N1; If the power P9 is not less than the power P8, a prompt information is sent by the vehicle, and the engine is controlled to operate at the speed N2.

2. The vehicle control method according to claim 1, characterized by, Before the engine is controlled to operate according to the torque Q4, the vehicle sends a prompt information.

3. The vehicle control method according to claim 1 or 2, characterized by, After the engine is controlled to operate according to the torque Q4, when a first command issued by a user is received, the engine is directly controlled to return to the original torque output state, and the short-time torque release mode is maintained in the activated state.

4. A vehicle control device characterized by comprising: The vehicle is a fuel vehicle, and the device comprises: A first condition judging unit is configured to, when a preset short-time torque release mode in the vehicle is in an activated state, obtain a current required torque Q2 of the vehicle and a maximum torque Q3 marked on an external characteristic curve of the engine; and judge whether the torque Q2 is greater than the maximum torque Q3; A short-time torque enhancement unit is configured to, when the torque Q2 is greater than the maximum torque Q3, control the engine to operate according to a torque Q4, and monitor the time for which the engine continuously operates according to the torque Q4; when the time reaches a preset time T1, control the engine to return to an original torque output state; Wherein, the torque Q1 is a maximum torque allowed to be continuously output by the engine within the time T1, and the value thereof is greater than the maximum torque Q3; the torque Q4 is the minimum value between the torque Q1 and the torque Q2; A second condition judging unit is configured to, when a preset economy improvement mode in the vehicle is in an activated state, judge whether a current engine speed is greater than a rated speed N1, and if yes, judge whether the time for which the engine speed is greater than the rated speed N1 exceeds a preset time T3; if the time T3 is exceeded, a current required power P8 of the vehicle is calculated, and a maximum power P9 that can be output by the vehicle when the engine operates at a preset speed N2 is calculated; the speed N2 is not greater than the speed N1. The economic improvement unit is configured to control the vehicle to issue a prompt information and control the engine to operate at the rotation speed N2 when the power P9 is not less than the power P8.

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