Control method of hybrid power vehicle and hybrid power vehicle

Abstract

The invention discloses a control method of a hybrid power vehicle and the hybrid power vehicle. The control method of the hybrid power vehicle comprises the steps that the current vehicle speed of the hybrid power vehicle and the current SOC value of a power battery of the hybrid power vehicle are obtained; 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 S0C target value plus the offset value; if not, the S0C target value is kept unchanged; if yes, the S0C target value is the current SOC target value plus the stepping value. According to the control method of the hybrid power vehicle, the correlation between the SOC target value and the driving time (namely the driving mileage) of the hybrid power vehicle is achieved, so that the SOC target value is adjusted more reasonably, the situation that the engine continuously charges the power battery, consequently, the meter display oil consumption is high, and the user experience is affected is avoided, and the fuel economy and the service life of the power battery are optimized.

Description

Technical Field

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

[0002] The advantage of hybrid vehicles is that they can not only eliminate the current problem of insufficient pure electric driving range, but also make the engine work more efficiently and improve overall fuel economy through the reasonable allocation of oil and electricity working conditions. Among them, the state of charge (SOC) of the power battery of hybrid vehicles is one of the core of energy management. Through the precise control of the power battery capacity, the efficient operation and energy saving of hybrid vehicles 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 conditions. However, in some specific working conditions or when the throttle operation fluctuates frequently, there will be a problem of frequent engine start and stop to charge the power battery, which affects the actual fuel economy and the durability of the components. Summary of the invention

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

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

[0006] According to an embodiment of the present invention, a control method for a hybrid vehicle includes: obtaining 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 meets a first preset condition; adjusting an SOC target value of the power battery according to the current SOC value; determining whether a current SOC value is greater than or equal to a 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.

[0007] 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 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, so as to control whether the engine charges the power battery 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, and realize the correlation 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 to cause high apparent fuel consumption affecting user experience, and optimize fuel economy and power battery life.

[0008] In some embodiments of the present invention, 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.

[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 a 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 of the hybrid vehicle also 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 a 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 of the hybrid vehicle also 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 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.

[0012] In some embodiments of the present invention, the offset 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 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 satisfies a second preset condition; and the SOC target value of the power battery is a second fixed calibration value of the SOC.

[0015] In some embodiments of the present invention, 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 the deceleration states, wherein 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 SOC is 15%-25%.

[0017] According to the hybrid vehicle of the embodiment of the present invention, the hybrid vehicle operates based on the above-mentioned control method of the hybrid vehicle, and the hybrid vehicle includes: a power battery; and an engine, wherein the engine is suitable for charging the power battery.

[0018] According to the hybrid vehicle of the embodiment of the present invention, the hybrid vehicle includes a power battery and an engine, the engine is suitable for charging the power battery, and the hybrid vehicle is operated based on the control method of the hybrid vehicle, so as to control whether the engine charges the power battery 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. 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 more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery to cause high apparent fuel consumption affecting user experience, and optimize fuel economy and power battery life.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

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

[0023] Figure 3 is a flow chart of a control method for a hybrid vehicle according to yet another embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The following describes a control method for a hybrid vehicle according to an embodiment of the present invention with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the control method of 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 of the hybrid vehicle of the present application is to adjust the SOC target value of the power battery according to the vehicle speed of the hybrid vehicle, and to control whether the engine charges the power battery according to the comparison between the current SOC value of the power battery and the SOC target value. Therefore, it is necessary to first 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 speed of the hybrid vehicle may be acquired in real time through sensors built into the hybrid vehicle; or, the SOC of the power battery and the speed of the hybrid vehicle may be acquired in real time through an 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 speed of the hybrid vehicle is obtained to determine whether the hybrid vehicle meets the first preset condition. If so, determine that the hybrid vehicle meets the first preset condition, so as to perform the subsequent steps to adjust the SOC target value of the power battery. It should be noted that the first preset condition is specifically described in the subsequent embodiments.

[0031] The SOC target value of the power battery is adjusted according to the current SOC value. Therefore, after the above steps confirm 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 the engine is controlled to charge the power battery according to the current SOC target value adjusted in real time, so as to reasonably set the SOC target value according to the speed of the hybrid vehicle, and optimize the fuel economy and the life of the power battery.

[0032] Determine whether the current SOC value is greater than or equal to the current SOC target value plus the bias value. It is understandable that if the engine immediately charges the power battery when the current SOC is close to or reaches the target value, it may cause energy waste and increase the number of power battery cycles. At the same time, hybrid vehicles can recover energy and store it in the power battery under braking or downhill conditions. The existence of the bias 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 bias value, the engine charges the power battery; when the current SOC value is greater than or equal to the current SOC target value minus the bias value, the engine stops charging the power battery.

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

[0034] If not, the SOC target value remains unchanged. It is understandable that when the current SOC value is less than the current SOC target value plus the bias 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 bias value, the engine stops charging the power battery and adjusts the SOC target value.

[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 also includes judging 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 judge 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 bias value. It can be understood that if the current SOC target value is less than or equal to the SOC upper limit value, it 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 bias value. When the current SOC 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 minus the bias value, the engine stops charging the power battery.

[0047] If not, the SOC target value remains unchanged. It is understandable that when the current SOC value is less than the current SOC target value plus the bias 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 bias value, 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 is understandable that 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, thereby achieving 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 between the SOC target value and 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.

[0049] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the control method of the hybrid vehicle also includes judging 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 judge 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, 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. 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 SOC specific fixed value, thereby preventing the power battery from being damaged due to overcharging. At the same time, by ensuring that the SOC specific fixed value is less than the SOC upper limit value and greater than the SOC first fixed calibration value, while preventing the power battery from being damaged due to overcharging, it is avoided that the SOC target value is too low, and the power battery cannot be guaranteed to maintain the basic operation of the hybrid vehicle and the normal use of fixed functions, thereby improving the reliability of the control method.

[0051] At the same time, after adjusting the SOC target value to the specific SOC fixed value, it is determined whether the current SOC value is greater than or equal to the current SOC target value plus the bias value. Therefore, after adjusting the SOC target value to the specific SOC fixed value, it is continued to be determined whether the current SOC value is greater than or equal to the current SOC target value plus the bias value, and when the current SOC 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 minus the bias value, the engine stops charging the power battery.

[0052] If not, the SOC target value remains unchanged. It is understandable that when the current SOC value is less than the current SOC target value plus the bias 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 bias value, the engine stops charging the power battery and adjusts the SOC target value.

[0053] If so, the SOC target value is the current SOC target value plus the step value. It is understandable that 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, thereby achieving 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 between the SOC target value and 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.

[0054] In some embodiments of the present invention, the bias value is 1%-5%. It is understandable that if the bias value is too low, the power battery may frequently perform charge and discharge cycles when it is close to full charge or empty, increase the number of charge and discharge times of the power battery, accelerate the aging process of the power battery, and shorten the service life of the power battery. If the bias value is too high, the system may not be able to fully utilize the energy of the engine to charge the power battery, and when the power battery power is 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 bias value to 1%-5%, while protecting the power battery from damage caused by excessive charge and discharge, the energy between the engine and the power battery is more intelligently allocated, the energy utilization efficiency is improved, and energy waste is reduced. Optionally, the bias value is 1%, 2%, 3%, 4% or 5%.

[0055] In some embodiments of the present invention, the step value is 0.5%-2%. It is understandable that if the step value is too high, the engine will continue to charge the power battery, resulting in high apparent fuel consumption and affecting 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%, the fuel economy can be optimized while adjusting the SOC target value. 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%. Thus, such a setting ensures that the power battery maintains the basic operation of the hybrid vehicle and the normal use of fixed functions, and will cause excessive discharge of the power battery to 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, Figure 3 As shown, the control method of the hybrid vehicle also includes determining whether the hybrid vehicle meets the second preset condition. Therefore, according to the above steps, the current 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, so as to perform the subsequent steps to adjust the SOC target value of the power battery. It should be noted that the second preset condition is specifically described in the subsequent embodiments.

[0058] The SOC target value of the power battery is the SOC second fixed calibration value. Therefore, after the above step confirms that the hybrid vehicle meets the second preset condition, the SOC target value of the power battery is the SOC second fixed calibration value, and 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 the current vehicle speed being less than or equal to the second preset vehicle speed, the current vehicle speed being less than or equal to the first preset vehicle speed and greater than the second preset vehicle speed, and the hybrid vehicle being in at least one of a deceleration state, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0060] It is understandable that, because the driving force required by the hybrid vehicle is not within the optimal operating range of the engine when driving at low speed, the pure electric mode usually provides the driving force. At the same time, due to the low speed, the noise level of the vehicle itself is relatively low, making the engine noise more obvious and abrupt. Therefore, when 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 the deceleration states, the hybrid vehicle needs to reduce the engine intervention time.

[0061] Therefore, after the hybrid vehicle meets the second preset condition, the SOC target value of the power battery is the SOC second fixed calibration value. The second fixed calibration value is used to ensure 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, so as to achieve pure electric driving of the hybrid vehicle as much as possible, reduce energy consumption and NVH (Noise, Vibration, Harshness), and improve user experience.

[0062] In some embodiments of the present invention, the second fixed calibration value of SOC is 15%-25%. Thus, such a setting ensures 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] Reference below Figure 1-Figure 3 The control method of a hybrid vehicle according to a specific embodiment of the present invention is described in detail. It should be understood that the following description is only an exemplary description and should not be construed as limiting the present invention.

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

[0065] Get 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] A hybrid vehicle according to an embodiment of the present invention will be described below.

[0070] According to the hybrid vehicle of the embodiment of the present invention, the hybrid vehicle is operated based on the control method of the hybrid vehicle, and the hybrid vehicle includes a power battery and an engine, wherein the engine is suitable for charging the power battery.

[0071] The control method of a 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.

[0072] Thus, the engine is controlled to charge the power battery 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. Specifically, when the current SOC 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 minus 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 more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery, resulting in high apparent fuel consumption affecting the user experience, and optimize the fuel economy and power battery life.

[0073] According to the hybrid vehicle of the embodiment of the present invention, the hybrid vehicle includes a power battery and an engine, the engine is suitable for charging the power battery, and the hybrid vehicle is operated based on the control method of the hybrid vehicle, so as to control whether the engine charges the power battery 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. 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 more reasonably adjust the SOC target value, avoid the engine continuously charging the power battery to cause high apparent fuel consumption affecting user experience, and optimize fuel economy and power battery life.

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

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0076] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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; 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 SOC target value remains unchanged; If so, 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 first preset condition includes: 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 at least one of an acceleration state, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

3. 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.

4. 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.

5. 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 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.

6. 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%.

7. The control method of a hybrid vehicle according to claim 3, characterized in that: The first fixed calibration value of SOC is 15%-25%.

8. 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.

9. The control method of a hybrid vehicle according to claim 8, 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.

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

11. 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 10, the hybrid vehicle comprising: Power battery; An engine is suitable for charging the power battery.

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