Control Method for Hybrid Vehicle and Hybrid Vehicle

Abstract

The present invention discloses a control method for a hybrid vehicle and a hybrid vehicle. The control method for the hybrid vehicle includes: obtaining the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery of the hybrid vehicle; determining that the hybrid vehicle meets a first preset condition; adjusting the SOC target value of the power battery according to the current SOC value; judging whether the current SOC value is greater than or equal to the current SOC target value plus a bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus a step value. According to the control method for the hybrid vehicle of the present invention, the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle is realized, so as to more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery, resulting in high displayed fuel consumption and affecting the user experience, and optimize the fuel economy and the service life of the power battery.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a control method for a hybrid vehicle and a hybrid vehicle. Background Art

[0002] The advantages of hybrid vehicles are that they can not only solve the problem of insufficient pure - electric driving range at present, but also make the engine work more efficiently by reasonably distributing the fuel - electric working conditions, improving the overall fuel economy. Among them, the State of Charge (SOC) of the power battery of a hybrid vehicle is one of the cores of energy management. By accurately controlling the capacity of the power battery, the efficient operation and energy - saving purpose of the hybrid vehicle can be achieved.

[0003] In the prior art, the power - battery capacity control strategy is usually based on a fixed SOC threshold. For example, different fixed SOC thresholds are set under different driving states. However, in some specific working conditions or during driving with frequent throttle - operation fluctuations, there will be a problem that the engine starts and stops frequently to charge the power battery, affecting the actual fuel economy and the durability of components. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a control method for a hybrid vehicle, and the control method for the hybrid vehicle optimizes the fuel economy and the service life of the power battery of the hybrid vehicle.

[0005] The present invention also provides a hybrid vehicle, and the hybrid vehicle includes the above - mentioned control method for the hybrid vehicle.

[0006] According to the control method for a hybrid vehicle of an embodiment of the present invention, it includes: obtaining the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery of the hybrid vehicle; determining that the hybrid vehicle meets a first preset condition; adjusting the SOC target value of the power battery according to the current SOC value; judging whether the current SOC value is greater than or equal to the current SOC target value plus an offset value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus a step value.

[0007] A control method for a hybrid vehicle according to an embodiment of the present invention determines that the hybrid vehicle meets a first preset condition by obtaining the current vehicle speed and the current SOC value of the power battery, adjusts the SOC target value of the power battery according to the current SOC value, and determines whether the current SOC value is greater than or equal to the current SOC target value plus a bias value. If not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus a step value. Thus, it controls whether the engine charges the power battery according to the comparison result between the currently obtained current SOC value and the sum of the real-time adjusted SOC target value plus the bias value, and realizes the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle, so as to more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery resulting in high displayed fuel consumption and affecting the user experience, and optimize the fuel economy and the service life of the power battery.

[0008] In some embodiments of the present invention, the first preset condition includes at least one of the following: the current vehicle speed is greater than a first preset vehicle speed, and the current vehicle speed is greater than a second preset vehicle speed and less than the first preset vehicle speed, and the hybrid vehicle is in an accelerating state, where the first preset vehicle speed is greater than the second preset vehicle speed.

[0009] In some embodiments of the present invention, adjusting the SOC target value of the power battery according to the current SOC value includes: determining whether the current SOC value is greater than or equal to the first fixed calibration value of the SOC of the power battery; if so, the SOC target value is the current SOC value; if not, the SOC target value is the first fixed calibration value of the SOC.

[0010] In some embodiments of the present invention, the control method for the hybrid vehicle further includes: determining whether the current SOC target value is less than or equal to the SOC upper limit value; if the current SOC target value is less than or equal to the SOC upper limit value, determining whether the current SOC value is greater than or equal to the current SOC target value plus the bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus the step value.

[0011] In some embodiments of the present invention, the control method for the hybrid vehicle further includes: determining whether the current SOC target value is greater than the SOC upper limit value; if the current SOC target value is greater than the SOC upper limit value, adjusting the SOC target value to a specific fixed value of the SOC, where the specific fixed value of the SOC is less than the SOC upper limit value and greater than the first fixed calibration value of the SOC.

[0012] In some embodiments of the present invention, the bias value is 1% - 5%; and / or, the step value is 0.5% - 2%.

[0013] In some embodiments of the present invention, the first fixed calibration value of the SOC is 15%-25%.

[0014] In some embodiments of the present invention, the control method of the hybrid vehicle further includes: determining that the hybrid vehicle meets a second preset condition; the target value of the SOC of the power battery is the second fixed calibration value of the SOC.

[0015] In some embodiments of the present invention, the second preset condition includes at least one of: the current vehicle speed is less than or equal to a second preset vehicle speed, and the current vehicle speed is less than or equal to a first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle is in a deceleration state, where the first preset vehicle speed is greater than the second preset vehicle speed.

[0016] In some embodiments of the present invention, the second fixed calibration value of the SOC is 15%-25%.

[0017] For the hybrid vehicle according to an embodiment of the present invention, the hybrid vehicle operates based on the above control method of the hybrid vehicle, and the hybrid vehicle includes: a power battery; an engine, and the engine is adapted to charge the power battery.

[0018] For the hybrid vehicle according to an embodiment of the present invention, the hybrid vehicle includes a power battery and an engine, and the engine is adapted to charge the power battery. By operating the hybrid vehicle based on the control method of the hybrid vehicle, whether the engine charges the power battery is controlled according to the comparison result of the currently obtained current SOC value and the sum of the target value of the SOC adjusted in real time and the offset value. At the same time, the control method of the hybrid vehicle realizes the association between the target value of the SOC and the driving time (i.e., driving mileage) of the hybrid vehicle, so as to more reasonably adjust the target value of the SOC, avoid the engine continuously charging the power battery resulting in high displayed fuel consumption and affecting the user experience, and optimize the fuel economy and the service life of the power battery.

[0019] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0020] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is a flowchart of a control method of a hybrid vehicle according to an embodiment of the present invention;

[0022] Figure 2 is a flowchart of a control method of a hybrid vehicle according to another embodiment of the present invention;

[0023] Figure 3 It is a flowchart of a control method for a hybrid vehicle according to another embodiment of the present invention. Detailed implementation manners

[0024] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The control method for a hybrid vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0028] As Figure 1 shown, the control method for a hybrid vehicle according to an embodiment of the present invention includes obtaining the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery of the hybrid vehicle. It can be understood that the control method for the hybrid vehicle in the present application adjusts the SOC target value of the power battery according to the vehicle speed of the hybrid vehicle, and controls whether the engine charges the power battery according to the comparison between the current SOC value and the SOC target value of the power battery. Therefore, it is first necessary to obtain the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery.

[0029] Optionally, the SOC of the power battery and the vehicle speed of the hybrid vehicle can be obtained in real time through sensors built in the hybrid vehicle; alternatively, the SOC of the power battery and the vehicle speed of the hybrid vehicle can be obtained in real time through the electronic control system of the hybrid vehicle.

[0030] Determine that the hybrid vehicle meets the first preset condition. Thus, according to the above steps, the current vehicle speed of the hybrid vehicle is obtained to determine whether the hybrid vehicle meets the first preset condition. If so, it is determined that the hybrid vehicle meets the first preset condition, and then the subsequent steps are executed to adjust the SOC target value of the power battery. It should be noted that the first preset condition will be specifically described in the subsequent embodiments.

[0031] Adjust the SOC target value of the power battery according to the current SOC value. Thus, after it is confirmed in the above steps that the hybrid vehicle meets the first preset condition, the SOC target value of the power battery is adjusted in real time according to the current SOC value of the power battery, and whether the engine charges the power battery is controlled according to the adjusted current SOC target value in real time, so as to reasonably set the SOC target value according to the vehicle speed of the hybrid vehicle, and optimize the fuel economy and the service life of the power battery.

[0032] Judge whether the current SOC value is greater than or equal to the current SOC target value plus the offset value. It can be understood that when the current SOC is close to or reaches the target value, if the engine immediately charges the power battery, it may cause energy waste and an increase in the number of charge-discharge cycles of the power battery. At the same time, the hybrid vehicle can recover energy and store it in the power battery under conditions such as braking or downhill. The existence of the offset value helps to ensure that the power battery can receive the recovered energy when needed, thereby improving the energy recovery efficiency. Specifically, when the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery; when the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery.

[0033] Thus, after adjusting the SOC target value of the power battery according to the current SOC value through the above steps, it is controlled whether the engine charges the power battery according to whether the current SOC value is greater than or equal to the current SOC target value plus the offset value.

[0034] If not, the SOC target value remains unchanged. It can be understood that when the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery. At this time, the SOC target value remains unchanged until the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery, and the SOC target value is adjusted.

[0035] If so, the SOC target value is the current SOC target value plus the step value. It is understandable that after the above steps adjust the SOC target value of the power battery according to the current SOC value, the current SOC value is definitely less than the current SOC target value plus the bias value, thus, the engine will charge the power battery, and when the current SOC value is greater than or equal to the current SOC target value plus the bias value, the engine stops charging the power battery, at this time, the SOC shutdown flag is triggered, and the SOC target value is adjusted to the current SOC target value plus the step value, so as to achieve the adjustment of the SOC target value. At the same time, since the adjustment of the SOC target value is based on the time (i.e. driving mileage) of the hybrid vehicle, the association of the SOC target value with the time (i.e. driving mileage) of the hybrid vehicle is achieved, so as to more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery to cause the high apparent fuel consumption to affect the user experience, and optimize fuel economy.

[0036] According to the control method of the hybrid vehicle of the embodiment of the present invention, by obtaining the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery, it is determined that the hybrid vehicle meets the first preset condition, the SOC target value of the power battery is adjusted according to the current SOC value, and it is judged whether the current SOC value is greater than or equal to the current SOC target value plus the bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus the step value. Thus, according to the comparison result of the current SOC value obtained in real time and the sum of the SOC target value plus the bias value adjusted in real time, the engine is controlled to charge the power battery, and the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle is achieved, so as to more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery to cause high apparent fuel consumption affecting the user experience, and optimize the fuel economy and the life of the power battery.

[0037] In some embodiments of the present invention, the first preset condition includes the current vehicle speed being greater than the first preset vehicle speed, the current vehicle speed being greater than the second preset vehicle speed and less than the first preset vehicle speed, and the hybrid vehicle being in at least one of an acceleration state, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0038] It can be understood that when the current speed of the hybrid vehicle is greater than the first preset speed, the hybrid vehicle is in a high-speed driving stage. Since the engine runs at a higher speed, it can enter its efficient working range. At this time, the hybrid vehicle is in the engine direct drive mode as much as possible, which can more effectively utilize fuel energy and reduce the loss in the energy conversion process. Or, the current speed is greater than the second preset speed and less than the first preset speed, and the hybrid vehicle is in an acceleration state. At this time, by putting the engine in the direct drive mode as much as possible, the fuel energy can be more effectively utilized and the loss in the energy conversion process can be reduced.

[0039] Therefore, determining that the hybrid vehicle meets the first preset condition can be understood as: the hybrid vehicle is in the engine direct drive mode as much as possible. At the same time, after determining that the hybrid vehicle meets the first preset condition, the SOC target value of the power battery is adjusted according to the current SOC value, and when the current SOC value is less than the current SOC target value, the engine is directly driven while charging the power battery to ensure that the power battery has a higher capacity, which is convenient for the subsequent pure electric mode of the hybrid vehicle and further optimizes fuel economy.

[0040] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, adjusting the SOC target value of the power battery according to the current SOC value includes:

[0041] Determine whether the current SOC value is greater than or equal to the first fixed SOC calibration value of the power battery. It is understandable that the SOC target value is related to the current SOC value, and thus, it is necessary to determine whether the current SOC value is greater than or equal to the first fixed SOC calibration value of the power battery according to the current SOC value obtained in the above steps.

[0042] If not, the SOC target value is the first fixed SOC calibration value. It is understandable that if the SOC target value is too low, it is impossible to ensure that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, and it will cause the power battery to over-discharge and affect the power battery performance. Therefore, by setting the first fixed SOC calibration value as the SOC lower limit value, and when the current SOC value is less than the first fixed SOC calibration value of the power battery, the current SOC target value is set to the first fixed SOC calibration value, so as to ensure the performance stability and system safety of the hybrid vehicle.

[0043] If yes, then the SOC target value is the current SOC value. It is understandable that the first SOC fixed calibration value is the SOC lower limit value, and when the current SOC value is greater than or equal to the first SOC fixed calibration value of the power battery, the SOC target value is the current SOC value, and the SOC target value can be adjusted according to the current SOC value, so as to set the SOC target value more reasonably and optimize the fuel economy and power battery life.

[0044] For example, in a specific embodiment, the first fixed calibration value of the SOC of the power battery is 20%. If the current SOC value is 15%, the SOC target value is 20%; or, if the current SOC value is 40%, the SOC target value is 20%.

[0045] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the control method of the hybrid vehicle further includes determining whether the current SOC target value is less than or equal to the SOC upper limit value. It can be understood that the setting of the SOC upper limit value can effectively prevent the power battery from being damaged due to overcharging. Therefore, it is necessary to determine whether the current SOC target value is less than or equal to the SOC upper limit value according to the current SOC target value.

[0046] If the current SOC target value is less than or equal to the SOC upper limit value, determine whether the current SOC value is greater than or equal to the current SOC target value plus the offset value. It can be understood that the current SOC target value being less than or equal to the SOC upper limit value means that the SOC target can continue to increase. Therefore, after the current SOC target value is less than or equal to the SOC upper limit value, continue to determine whether the current SOC value is greater than or equal to the current SOC target value plus the offset value. When the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery; when the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery.

[0047] If not, the SOC target value remains unchanged. It can be understood that when the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery. At this time, the SOC target value remains unchanged until the current SOC value is greater than or equal to the current SOC target value plus the offset value, then the engine stops charging the power battery and adjusts the SOC target value.

[0048] If so, the SOC target value is the current SOC target value plus the step value. It can be understood that when the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery. At this time, the SOC shutdown flag is triggered, and the SOC target value is adjusted to the current SOC target value plus the step value, thereby realizing the adjustment of the SOC target value. At the same time, since the adjustment of the SOC target value is based on the driving time (i.e., driving mileage) of the hybrid vehicle, the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle is realized, so as to more reasonably adjust the SOC target value, avoid the high displayed fuel consumption caused by the engine continuously charging the power battery and affecting the user experience, and optimize the fuel economy.

[0049] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the control method of the hybrid vehicle further includes determining whether the current SOC target value is greater than the SOC upper limit value. It can be understood that the setting of the SOC upper limit value can effectively prevent the power battery from being damaged due to overcharging. Therefore, it is necessary to determine whether the current SOC target value is less than or equal to the SOC upper limit value according to the current SOC target value.

[0050] If the current SOC target value is greater than the SOC upper limit value, adjust the SOC target value to a specific fixed value of SOC, where the specific fixed value of SOC is less than the SOC upper limit value and greater than the first fixed calibration value of SOC. Thus, when the current SOC target value is greater than the SOC upper limit value, it is necessary to reduce the SOC target value to the specific fixed value of SOC to prevent the power battery from being damaged due to overcharging. At the same time, by the specific fixed value of SOC being less than the SOC upper limit value and greater than the first fixed calibration value of SOC, while preventing the power battery from being damaged due to overcharging, it is avoided that the SOC target value is too low to ensure that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, improving the reliability of the control method.

[0051] At the same time, after adjusting the SOC target value to the specific fixed value of SOC, determine whether the current SOC value is greater than or equal to the current SOC target value plus the offset value. Thus, after adjusting the SOC target value to the specific fixed value of SOC, continue to determine whether the current SOC value is greater than or equal to the current SOC target value plus the offset value. When the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery; when the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery.

[0052] If not, the SOC target value remains unchanged. It can be understood that when the current SOC value is less than the current SOC target value plus the offset value, the engine charges the power battery. At this time, the SOC target value remains unchanged until the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery, and the SOC target value is adjusted.

[0053] If so, the SOC target value is the current SOC target value plus the step value. It can be understood that when the current SOC value is greater than or equal to the current SOC target value plus the offset value, the engine stops charging the power battery. At this time, the SOC shutdown flag is triggered, and the SOC target value is adjusted to the current SOC target value plus the step value, thereby realizing the adjustment of the SOC target value. At the same time, since the adjustment of the SOC target value is based on the driving time (i.e., driving mileage) of the hybrid vehicle, the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle is realized, so as to more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery resulting in high displayed fuel consumption affecting the user experience, and optimize the fuel economy.

[0054] In some embodiments of the present invention, the offset value is 1% - 5%. It can be understood that if the offset value is too low, the power battery may frequently perform charge and discharge cycles when it is close to full charge or empty charge, increasing the charge and discharge times of the power battery, accelerating the aging process of the power battery, and shortening the service life of the power battery. If the offset value is too high, it may cause the system to be unable to fully utilize the energy of the engine to charge the power battery, and when the power battery power is already close to the upper limit, the system may still continue to charge, which will not only increase energy waste but also reduce energy utilization efficiency. Therefore, by setting the offset value to 1% - 5%, while protecting the power battery from overcharge and overdischarge damage, the energy between the engine and the power battery is more intelligently allocated, improving energy utilization efficiency and reducing energy waste. Optionally, the offset value is 1%, 2%, 3%, 4% or 5%.

[0055] In some embodiments of the present invention, the step value is 0.5% - 2%. It can be understood that if the step value is too high, the engine continuously charging the power battery will cause a high displayed fuel consumption and affect the user experience, while if the step value is too low, the engine will frequently charge the power battery. Therefore, by setting the step value to 0.5% - 2%, while adjusting the SOC target value, the fuel economy is optimized. Optionally, the step value is 0.5%, 1%, 1.5% or 2%.

[0056] In some embodiments of the present invention, the first fixed calibration value of SOC is 15% - 25%. Therefore, through such a setting, it is ensured that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, and it will cause the power battery to be overdischarged and affect the performance of the power battery. Optionally, the first fixed calibration value of SOC is 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%.

[0057] In some embodiments of the present invention, as Figure 3 shown, the control method of the hybrid vehicle further includes determining that the hybrid vehicle meets the second preset condition. Therefore, according to the above steps, the current vehicle speed of the hybrid vehicle is obtained to determine whether the hybrid vehicle meets the second preset condition. If so, it is determined that the hybrid vehicle meets the second preset condition, and then the subsequent steps are executed to adjust the SOC target value of the power battery. It should be noted that the second preset condition will be specifically described in the subsequent embodiments.

[0058] The SOC target value of the power battery is the second fixed calibration value of SOC. Therefore, after it is confirmed in the above steps that the hybrid vehicle meets the second preset condition, the SOC target value of the power battery is the second fixed calibration value of SOC. When the current SOC value is greater than or equal to the current SOC target value, the engine does not charge the power battery, and when the current SOC value is less than the current SOC target value, the engine charges the power battery.

[0059] In some embodiments of the present invention, the second preset condition includes at least one of the current vehicle speed being less than or equal to a second preset vehicle speed, the current vehicle speed being less than or equal to a first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle being in a deceleration state, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0060] It can be understood that when driving at a low speed, the driving force required by the hybrid vehicle is not within the optimal operating range of the engine. Therefore, usually, the pure electric mode provides the driving force. At the same time, due to the relatively low vehicle speed, the noise level of the vehicle itself is relatively low, making the engine noise more obvious and prominent. Thus, when at least one of the current vehicle speed is less than or equal to the second preset vehicle speed, the current vehicle speed is less than or equal to the first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle is in a deceleration state, the hybrid vehicle needs to reduce the engine intervention time.

[0061] Thus, after the hybrid vehicle meets the second preset condition, the SOC target value of the power battery is the second fixed calibration value of SOC. By the second fixed calibration value, it is ensured that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, and reduces the engine intervention time, tries to achieve pure electric driving of the hybrid vehicle, reduces energy consumption and NVH (Noise, Vibration, Harshness), and improves the user experience.

[0062] In some embodiments of the present invention, the second fixed calibration value of SOC is 15%-25%. Thus, through such a setting, it is ensured that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions. Optionally, the second fixed calibration value of SOC is 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%.

[0063] Next, with reference to Figures 1 - 3 The control method of the hybrid vehicle in specific embodiments of the present invention will be described in detail. It can be understood that the following description is only an exemplary illustration and cannot be construed as a limitation of the invention.

[0064] The control method of the hybrid vehicle includes:

[0065] Obtain the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery.

[0066] Determine whether the hybrid vehicle meets the first preset condition, the first preset condition includes: the current vehicle speed is greater than the first preset vehicle speed, and the current vehicle speed is greater than the second preset vehicle speed and less than the first preset vehicle speed, and the hybrid vehicle is in at least one of the acceleration states, wherein the first preset vehicle speed is greater than the second preset vehicle speed. Determine whether the current SOC value is greater than or equal to the first fixed calibration value of the SOC of the power battery; if so, the SOC target value is the current SOC value; if not, the SOC target value is the first fixed calibration value of the SOC. Determine whether the current SOC value is greater than or equal to the current SOC target value plus the bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus the step value. Thus, after the hybrid vehicle meets the first preset condition, the hybrid vehicle is in the engine direct drive mode as much as possible, and the SOC target value is adjusted in real time, so that the power battery has a higher capacity, optimizes fuel economy, and the adjustment of the SOC target value is associated with the driving time (i.e., driving mileage) of the hybrid vehicle, so as to avoid the engine continuously charging the power battery to cause the high apparent fuel consumption to affect the user experience.

[0067] Determine that the hybrid vehicle meets the second preset condition, the second preset condition includes: the current vehicle speed is less than or equal to the second preset vehicle speed, and the current vehicle speed is less than or equal to the first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle is in at least one of a deceleration state, wherein the first preset vehicle speed is greater than the second preset vehicle speed. The SOC target value of the power battery is the SOC second fixed calibration value. Therefore, after the hybrid vehicle meets the second preset condition, the hybrid vehicle is in pure electric mode as much as possible, and the SOC target value of the power battery is the SOC second fixed calibration value to ensure that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, reduce the intervention time of the engine, reduce energy consumption and NVH, and improve user experience.

[0068] Determine whether the current SOC target value is less than or equal to the SOC upper limit value; if the current SOC target value is less than or equal to the SOC upper limit value, determine whether the current SOC value is greater than or equal to the current SOC target value plus the bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus the step value. Determine whether the current SOC target value is greater than the SOC upper limit value; if the current SOC target value is greater than the SOC upper limit value, adjust the SOC target value to a SOC specific fixed value, wherein the SOC specific fixed value is less than the SOC upper limit value and greater than the SOC first fixed calibration value. Thus, in the process of adjusting the SOC target value in real time, the power battery can be effectively prevented from being damaged due to overcharging by setting the SOC upper limit value, and the SOC is reduced to the SOC specific fixed value when the SOC target value exceeds the SOC upper limit value, thereby improving the reliability of the control method.

[0069] The hybrid vehicle according to an embodiment of the present invention will be described below.

[0070] The hybrid vehicle according to an embodiment of the present invention operates based on a control method of the hybrid vehicle. The hybrid vehicle includes a power battery and an engine. Among them, the engine is adapted to charge the power battery.

[0071] The control method of the hybrid vehicle includes obtaining the current vehicle speed of the hybrid vehicle and the current SOC value of the power battery of the hybrid vehicle; determining that the hybrid vehicle meets a first preset condition; adjusting the SOC target value of the power battery according to the current SOC value; judging whether the current S0C value is greater than or equal to the current SOC target value plus a bias value; if not, the SOC target value remains unchanged; if so, the SOC target value is the current SOC target value plus a step value.

[0072] Thus, it is controlled whether the engine charges the power battery according to the comparison result between the currently obtained current SOC value and the sum of the real-time adjusted SOC target value plus the bias value. Specifically, when the current S0C value is less than the current SOC target value plus the bias value, the engine charges the power battery; when the current SOC value is greater than or equal to the current SOC target value plus the bias value, the engine stops charging the power battery. At the same time, the control method of the hybrid vehicle realizes the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle, so as to adjust the SOC target value more reasonably, avoid the high apparent fuel consumption caused by the engine continuously charging the power battery, which affects the user experience, and optimize the fuel economy and the service life of the power battery.

[0073] The hybrid vehicle according to an embodiment of the present invention includes a power battery and an engine. The engine is adapted to charge the power battery. By operating the hybrid vehicle based on the control method of the hybrid vehicle, it is controlled whether the engine charges the power battery according to the comparison result between the currently obtained current SOC value and the sum of the real-time adjusted SOC target value plus the bias value. At the same time, the control method of the hybrid vehicle realizes the association between the SOC target value and the driving time (i.e., driving mileage) of the hybrid vehicle, so as to adjust the SOC target value more reasonably, avoid the high apparent fuel consumption caused by the engine continuously charging the power battery, which affects the user experience, and optimize the fuel economy and the service life of the power battery.

[0074] Other components of the hybrid vehicle according to an embodiment of the present invention, such as the engine and the power battery, etc., and the operations are known to those of ordinary skill in the art, and will not be described in detail here.

[0075] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0076] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for a hybrid vehicle, characterized in that: include: Acquiring a current vehicle speed of the hybrid vehicle and a current SOC value of a power battery of the hybrid vehicle; Determining that the hybrid vehicle satisfies a first preset condition, the first preset condition comprising at least one of the current vehicle speed being greater than a first preset vehicle speed, the current vehicle speed being greater than a second preset vehicle speed and less than the first preset vehicle speed, and the hybrid vehicle being in an accelerating state, wherein the first preset vehicle speed is greater than the second preset vehicle speed; Adjusting the SOC target value of the power battery according to the current SOC value; Determine whether the current SOC value is greater than or equal to the current SOC target value plus the bias value; If not, the engine of the hybrid vehicle charges the power battery, and the SOC target value remains unchanged; If so, the engine stops charging the power battery, and the SOC target value is the current SOC target value plus the step value.

2. The control method of a hybrid vehicle according to claim 1, characterized in that: The adjusting the SOC target value of the power battery according to the current SOC value includes: Determining whether the current SOC value is greater than or equal to a first fixed SOC calibration value of the power battery; If yes, the SOC target value is the current SOC value; If not, the SOC target value is the SOC first fixed calibration value.

3. The control method of a hybrid vehicle according to claim 1, characterized in that: The control method of the hybrid vehicle further includes: Determine whether the current SOC target value is less than or equal to the SOC upper limit value; If the current SOC target value is less than or equal to the SOC upper limit value, determine whether the current SOC value is greater than or equal to the current SOC target value plus the offset value; If not, the SOC target value remains unchanged; If so, the SOC target value is the current SOC target value plus the step value.

4. The control method of a hybrid vehicle according to claim 2, characterized in that: The control method of the hybrid vehicle further includes: Determine whether the current SOC target value is greater than the SOC upper limit value; If the current SOC target value is greater than the SOC upper limit value, the SOC target value is adjusted to a SOC specific fixed value, wherein the SOC specific fixed value is less than the SOC upper limit value and greater than the SOC first fixed calibration value.

5. The control method of a hybrid vehicle according to claim 1, characterized in that: The bias value is 1%-5%; And / or, the step value is 0.5%-2%.

6. The control method of a hybrid vehicle according to claim 2, characterized in that: The first fixed calibration value of SOC is 15%-25%.

7. The control method of a hybrid vehicle according to claim 1, characterized in that: The control method of the hybrid vehicle further includes: determining that the hybrid vehicle satisfies a second preset condition; The SOC target value of the power battery is a second fixed SOC calibration value.

8. The control method of a hybrid vehicle according to claim 7, characterized in that: The second preset condition includes: The current vehicle speed is less than or equal to a second preset vehicle speed, and the current vehicle speed is less than or equal to a first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle is in at least one of the deceleration states, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

9. The control method of a hybrid vehicle according to claim 8, characterized in that: The second fixed calibration value of SOC is 15%-25%.

10. A hybrid vehicle, characterized in that: The hybrid vehicle operates based on the control method of the hybrid vehicle according to any one of claims 1 to 9, and the hybrid vehicle comprises: Power battery; An engine is suitable for charging the power battery.

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