[0026] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.
[0027] In an embodiment of the present invention, such as figure 1 As shown, the hybrid vehicle may include an engine 1, a power motor 2, a power battery 3, and an auxiliary motor 4 connected to the engine 1, wherein the power motor 2 and the auxiliary motor 4 are both connected to the power battery 3. Further, as figure 2 As shown, the hybrid vehicle may also include a DC-DC converter 5 and a transmission 6, wherein the engine 1 outputs power to the wheels of the hybrid vehicle through the clutch and the transmission 6, and the power motor 2 is used to output driving force to the hybrid vehicle The power battery 3 is used to supply power to the power motor 2. The auxiliary motor 4 is respectively connected to the power motor 2, the DC-DC converter 5 and the power battery 3. The auxiliary motor 4 is driven by the engine 1 to run with negative torque to generate electricity . The electric energy generated by the auxiliary motor 4 can be provided to at least one of the power battery 3, the power motor 2, the DC-DC converter 5, the low-voltage load 7 and the high-voltage load (not shown in the figure). Among them, the low-voltage load 7 may include but is not limited to car lights, radios, etc., and the high-voltage load may include, but is not limited to, car air conditioners, etc.
[0028] As a result, the power motor 2 and the auxiliary motor 4 respectively act as a drive motor and a generator. Since the auxiliary motor 4 has high power generation and power generation efficiency at low speeds, it can meet the electricity demand for low-speed driving and maintain the low speed of the whole vehicle. Electric balance maintains low-speed ride comfort of the vehicle and improves the dynamic performance of the vehicle.
[0029] In some embodiments, the auxiliary motor 4 may be a BSG (Belt-driven Starter Generator, belt-driven starter/generator integrated motor) motor. It should be noted that the auxiliary motor 4 is a high-voltage motor. For example, the power generation voltage of the auxiliary motor 4 is equivalent to the voltage of the power battery 3, so that the electric energy generated by the auxiliary motor 4 can directly charge the power battery 3 without voltage conversion, or directly The power motor 2 and/or the DC-DC converter 5 supply power. In addition, the auxiliary motor 4 is also a high-efficiency generator. For example, when the engine 1 is idling, the auxiliary motor 4 is driven to generate electricity to achieve a power generation efficiency of over 97%.
[0030] Since the power connection between the BSG motor and the engine is relatively close, it is more suitable for implementing the hybrid electric vehicle and the shift control method and system thereof according to the embodiment of the present invention.
[0031] The hybrid electric vehicle and its shift control method and system according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0032] image 3 It is a flowchart of a shift control method of a hybrid electric vehicle according to an embodiment of the present invention.
[0033] Such as image 3 As shown, the shift control method of the hybrid electric vehicle in the embodiment of the present invention includes the following steps:
[0034] S1: When the engine is running, obtain the vehicle speed of the hybrid vehicle through the transmission control unit, and obtain the engine speed through the engine control unit.
[0035] S2, judging whether the assisted shift condition is met according to the vehicle speed of the hybrid electric vehicle and the engine speed.
[0036] When performing shift control, first check whether the communication between the various control units that perform shift control in the CAN (Controller Area Network) network is normal, and whether the device that ultimately performs shift control occurs. malfunction. Therefore, in an embodiment of the present invention, before determining whether the assisted shift conditions are met, the vehicle control unit and the auxiliary motor control unit, the vehicle control unit and the engine control unit, and the vehicle The communication status between the control unit and the transmission control unit, and detect the fault status of the auxiliary motor and the auxiliary motor control unit. Then, it can be judged whether the assisted shift conditions are met according to the above-mentioned communication status, fault status, vehicle speed of the hybrid electric vehicle and the engine speed.
[0037] Specifically, when the communication between the vehicle control unit and the auxiliary motor control unit, between the vehicle control unit and the engine control unit, and between the vehicle control unit and the transmission control unit is normal and the auxiliary motor and the auxiliary motor control unit are not malfunctioning When the hybrid vehicle accelerates and the engine speed is greater than the first preset speed, it is determined that the assisting upshift condition is satisfied; if the hybrid vehicle is decelerating and the engine speed is less than the second preset speed, it is judged that the assisting downshift condition is satisfied.
[0038] S3: If the assisted shifting conditions are met, the vehicle control unit generates an assisted shifting instruction and sends an assisted shifting instruction to the auxiliary motor control unit to control the output torque of the auxiliary motor to the engine to speed up the gear shift of the transmission.
[0039] Specifically, when it is determined that the conditions for assisting upshifting are met, the vehicle control unit generates an assisting upshifting instruction, and sends an assisting upshifting instruction to the auxiliary motor control unit to control the auxiliary motor to output negative torque to the engine, thereby increasing the engine speed. Decrease the speed until the engine speed is reduced to the first target speed, where the first target speed is the engine speed corresponding to the gear after the downshift.
[0040] When it is judged that the conditions for assisting downshifting are met, the vehicle control unit generates an assisting downshifting instruction and sends an assisting downshifting instruction to the auxiliary motor control unit to control the auxiliary motor to output positive torque to the engine, thereby increasing the rate of increase of the engine speed. Until the engine speed increases to the second target speed, where the second target speed is the engine speed corresponding to the gear after the upshift.
[0041] In a specific embodiment of the present invention, such as Figure 4 As shown, the communication status between the vehicle control unit and the auxiliary motor control unit can be detected through the following steps:
[0042] S101, the VCU (Vehicle Control Unit, vehicle control unit) judges whether a BSG message is received. If not, execute step S102; if yes, execute step S103. In this embodiment, the auxiliary motor is a BSG motor as an example.
[0043] S102, the timer accumulates the timing time. Then, step S104 is executed.
[0044] S103, the timer is cleared.
[0045] S104: Determine whether the timing time is greater than Cs. Cs is the set time threshold. If not, execute step S105; if yes, execute step S106.
[0046] S105: Determine that the communication between the VCU and the BSG motor control unit is normal.
[0047] S106: Determine that the communication between the VCU and the BSG motor control unit is abnormal.
[0048] In a specific embodiment of the present invention, such as Figure 5 As shown, the communication status between the vehicle control unit and the engine control unit ECU (Engine Control Unit) can be detected through the following steps:
[0049] S201: The VCU judges whether an ECU message is received. If not, execute step S202; if yes, execute step S203.
[0050] S202: The timer accumulates the timing time. Then step S204 is executed.
[0051] S203, the timer is cleared.
[0052] S204: Determine whether the timing time is greater than Cs. If not, execute step S205; if yes, execute step S206.
[0053] S205: Determine that the communication between the VCU and the ECU is normal.
[0054] S206: Determine that the communication between the VCU and the ECU is abnormal.
[0055] In a specific embodiment of the present invention, such as Image 6 As shown, the communication status between the vehicle control unit and the transmission control unit TCU (Transmission Control Unit) can be detected through the following steps:
[0056] S301: The VCU judges whether a TCU message is received. If not, execute step S302; if yes, execute step S303.
[0057] S302: The timer accumulates the timing time. Then step S304 is executed.
[0058] S303, the timer is cleared.
[0059] S304: Determine whether the timing time is greater than Cs. If not, execute step S305; if yes, execute step S306.
[0060] S305: It is judged that the communication between the VCU and the TCU is normal.
[0061] S306: Determine that the communication between the VCU and the TCU is abnormal.
[0062] In a specific embodiment of the present invention, such as Figure 7 As shown, the following steps can be used to determine whether the assisted shift conditions are met:
[0063] S401: Determine whether the engine is running, and determine whether the communication between the VCU and the BSG motor control unit, ECU, and TCU is normal. If yes, go to step S402; if not, go to step S411.
[0064] S402: Determine whether the vehicle is accelerating, and determine whether the engine speed exceeds Brpm. Among them, B is the preset rotational speed threshold. If yes, go to step S404; if no, go to step S403.
[0065] S403: Determine whether the vehicle is decelerating, and whether the engine speed drops to Arpm. Among them, A is the preset speed threshold. If yes, go to step S405; if not, go to step S408.
[0066] S404: Judge whether the BSG self-check is normal. Among them, the fault status of the BSG motor and the BSG motor control unit can be detected by the BSG motor control unit automatically running the detection program. This process is called the BSG self-test. If the BSG motor and the BSG motor control unit have no faults, the BSG self-test is normal. Step S407 may be executed; if the BSG motor or the BSG motor control unit fails, the BSG self-check is abnormal, and step S406 may be executed.
[0067] S405: Judge whether the BSG self-check is normal. If yes, go to step S409; if not, go to step S410.
[0068] S406, BSG motor assisted shifting is invalid, and TCU performs upshift control. In other words, when the BSG self-check is abnormal, the assisting shift conditions are not met, and the upshift process is completed by the TCU control at this time.
[0069] S407, BSG motor assists in upshifting.
[0070] S408, BSG motor assisted gear shifting is invalid. If the vehicle speed does not meet the conditions for assisted shifting, the BSG motor will not assist shifting.
[0071] S409, BSG motor assists in downshifting.
[0072] In S410, the BSG motor assisted shifting is invalid, and the TCU performs downshift control. That is to say, when the BSG self-check is abnormal, the assisting shift conditions are not met, and the downshift process is controlled by the TCU.
[0073] S411, BSG motor assisted gear shifting is invalid. The communication between VCU and BSG motor control unit is abnormal, or the communication between VCU and ECU is abnormal, or the communication between VCU and TCU is abnormal, that is, the communication status between the various control units that perform shift control in the CAN network does not meet the conditions for assisting shifting, BSG motor The assisted shift is not performed, that is, the shift control method of the embodiment of the present invention is not continuously executed.
[0074] In a specific embodiment of the present invention, such as Figure 8 As shown, the assisted shift control can be achieved through the following steps:
[0075] S501: The BSG motor control unit determines whether an assisting upshift instruction is received. If not, execute step S502; if yes, execute step S503.
[0076] S502: The BSG motor control unit determines whether an assisting downshift instruction is received. If not, execute step S504; if yes, execute step S505.
[0077] S503: Control the negative torque operation of the BSG motor, pull down the engine speed to the first target speed and exit. By controlling the negative torque operation of the BSG motor, braking torque is applied to the engine to increase the rate of decrease of the engine speed until the engine speed is reduced to the speed corresponding to the target gear. It should be understood that, due to the negative torque operation of the BSG motor, when the BSG motor assists in upshifting, the BSG motor can generate electricity at the same time to realize partial energy recovery.
[0078] S504, BSG motor assisted gear shifting is invalid, and the output torque of BSG motor is 0.
[0079] S505: Control the positive torque operation of the BSG motor, increase the engine speed to the second target speed and exit. By controlling the positive torque operation of the BSG motor, driving torque is applied to the engine to increase the rate of increase of the engine's speed until the engine's speed increases to the speed corresponding to the target gear.
[0080] In summary, according to the shift control method of a hybrid electric vehicle according to an embodiment of the present invention, the vehicle speed and engine rotation speed of the hybrid electric vehicle are obtained, and according to the obtained vehicle speed and rotation speed, it is judged whether the assisted shift condition is satisfied, and when the When assisting shift conditions, control the output torque of the auxiliary motor to the engine, thereby effectively shortening the shifting time of hybrid electric vehicles, improving the user’s driving experience, and at the same time reducing the wear on the clutch and helping to extend the clutch’s Service life.
[0081] Corresponding to the foregoing embodiment, the present invention also provides a non-transitory computer-readable storage medium.
[0082] The non-transitory computer-readable storage medium of the embodiment of the present invention has a computer program stored thereon, and when the program is executed by a processor, the shift control method for a hybrid electric vehicle proposed in the foregoing embodiment of the present invention can be implemented.
[0083] According to the non-temporary computer readable storage medium of the embodiment of the present invention, by executing the stored computer program, the shift time of the hybrid electric vehicle can be effectively shortened, the driving experience of the user can be improved, and the wear on the clutch can be reduced. Help extend the service life of the clutch.
[0084] Corresponding to the foregoing embodiment, the present invention also provides a shift control system for a hybrid electric vehicle.
[0085] Such as Picture 9 As shown, the shift control system 100 of the hybrid electric vehicle of the embodiment of the present invention includes a transmission control unit 10, an engine control unit 20, a vehicle control unit 30, and an auxiliary motor control unit 40.
[0086] Among them, the transmission control unit 10 is used to obtain the vehicle speed of the hybrid electric vehicle; the engine control unit 20 is used to obtain the engine speed; the vehicle control unit 30 is used to determine whether the assisted shift conditions are met according to the vehicle speed of the hybrid electric vehicle and the engine speed. , And generate an assisted shift command when the assisted shifting conditions are met; the auxiliary motor control unit 40 is used to receive and execute the assisted shift command to control the auxiliary motor to output torque to the engine to speed up the gear shift of the transmission.
[0087] When performing shift control, firstly, it can be confirmed whether the communication between the various control units that perform shift control in the CAN network is normal, and whether the device that ultimately performs shift control actions fails. Therefore, in an embodiment of the present invention, before determining whether the assisted shifting conditions are satisfied, the vehicle control unit 30 can also detect the communication between the auxiliary motor control unit 40, the engine control unit 20, and the transmission control unit. For the communication status between the units 10, the auxiliary motor control unit 40 is also used to detect the fault status of the auxiliary motor and the auxiliary motor control unit 40, and then the entire vehicle control unit 30 can be based on the above-mentioned communication status, fault status, and vehicle speed of the hybrid vehicle. And the engine speed to determine whether the assisted shift conditions are met.
[0088] Specifically, when the communication between the vehicle control unit 30 and the auxiliary motor control unit 40, the vehicle control unit 30 and the engine control unit 20, and the vehicle control unit 30 and the transmission control unit 10 is normal and the auxiliary motor and auxiliary motor When the motor control unit 40 does not fail, the vehicle control unit 30 determines that the assisting upshift condition is satisfied when the hybrid vehicle accelerates and the engine speed is greater than the first preset speed, and when the hybrid vehicle is decelerating and the engine speed is less than the first preset speed, 2. When the speed is preset, it is judged that the assisting downshift conditions are met.
[0089] When it is determined that the conditions for assisting upshifting are met, the vehicle control unit 30 may generate an assisting upshifting instruction, and sending an assisting upshifting instruction to the auxiliary motor control unit 40, and the auxiliary motor control unit 40 receives and executes the assisting upshifting instruction to control The auxiliary motor outputs negative torque to the engine, thereby increasing the rate of decrease of the engine speed until the engine speed is reduced to the first target speed, where the first target speed is the engine speed corresponding to the gear after the downshift.
[0090] When it is determined that the assisting downshifting conditions are satisfied, the vehicle control unit 30 may generate an assisting downshifting instruction, and send an assisting downshifting instruction to the auxiliary motor control unit 40, and the auxiliary motor control unit 40 receives and executes the assisting downshifting instruction to control The auxiliary motor outputs positive torque to the engine, thereby increasing the rate of increase of the engine speed until the engine speed increases to the second target speed, where the second target speed is the engine speed corresponding to the gear after the upshift.
[0091] For further implementations of the shift control system of the hybrid electric vehicle according to the embodiment of the present invention, reference may be made to the content disclosed in the above-mentioned shift control method of the hybrid electric vehicle, which will not be repeated here.
[0092] According to the shift control system of the hybrid electric vehicle according to the embodiment of the present invention, the vehicle speed and engine speed of the hybrid electric vehicle are obtained through the transmission control unit and the engine control unit respectively, and the vehicle control unit determines whether the vehicle speed and the engine speed meet the assistance requirements. Shift conditions, and when the assisted shift conditions are met, the auxiliary motor control unit controls the output torque of the auxiliary motor to the engine, which can effectively shorten the shift time of the hybrid vehicle, improve the user’s driving experience, and reduce Small wear on the clutch helps to extend the service life of the clutch.
[0093] Corresponding to the foregoing embodiment, the present invention also provides a hybrid electric vehicle.
[0094] Such as Picture 10 As shown, the hybrid electric vehicle 1000 of the embodiment of the present invention includes the shift control system 100 of the hybrid electric vehicle proposed in the foregoing embodiment of the present invention.
[0095] The hybrid electric vehicle according to the embodiment of the present invention can effectively shorten the shifting time, improve the driving experience of the user, and at the same time can reduce the wear of the clutch, which helps to extend the service life of the clutch.
[0096] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "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 drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the pointed device or The element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.
[0097] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless specifically defined otherwise.
[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , Or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction relationship between two components. 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.
[0099] In the present invention, unless otherwise clearly defined and defined, the first feature "on" or "under" the second feature may be in direct contact with the first and second features, or indirectly through an intermediary. contact. Moreover, the "above", "above", and "above" of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than the second feature. The first feature "below", "below" and "below" the second feature can mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
[0100] In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structure, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the characteristics of the different embodiments or examples described in this specification without contradicting each other.
[0101] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. A person of ordinary skill in the art can comment on the above-mentioned embodiments within the scope of the present invention. The embodiment undergoes changes, modifications, replacements and modifications.
