CN109955707B

CN109955707B - Hybrid electric vehicle and power generation control method and power system thereof

Info

Publication number: CN109955707B
Application number: CN201711404090.0A
Authority: CN
Inventors: 林东桥; 张鑫鑫; 杜智勇; 高锦龙
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2023-08-08
Anticipated expiration: 2037-12-22
Also published as: CN109955707A

Abstract

The invention discloses a hybrid electric vehicle, a power generation control method and a power system thereof, wherein the power system comprises: an engine that outputs power to wheels of a hybrid vehicle through a clutch; a power motor for outputting a driving force to wheels of the hybrid vehicle; the power battery is used for supplying power to the power motor; the auxiliary motor is connected with the engine and is respectively connected with the power motor and the power battery, and the auxiliary motor generates power under the drive of the engine; and the control module controls the auxiliary motor to enter a corresponding power generation mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery. Therefore, full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the running mileage of the whole vehicle can be met, and the user experience is improved.

Description

Hybrid electric vehicle and power generation control method and power system thereof

Technical Field

The invention relates to the field of automobiles, in particular to a power system of a hybrid electric vehicle, a power generation control method of the hybrid electric vehicle and the hybrid electric vehicle.

Background

At present, the driving modes of the hybrid electric vehicle mainly include a fuel mode, a pure electric mode and a hybrid power mode. In the conventional power generation technology of the hybrid vehicle, a power generation transmission chain is long, power generation efficiency is low for an in-situ power generation mode, and the hybrid vehicle cannot perform series power generation due to the limitation of a transmission mechanism.

In addition, because the high-voltage power of the whole vehicle is only derived from the power battery, when the power battery fails, all high-voltage electrical equipment of the whole vehicle cannot work, the whole operation of the whole vehicle is affected, and the driving experience of a user is poor.

Disclosure of Invention

The present invention aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, an object of the present invention is to provide a power system of a hybrid electric vehicle, which can realize all-condition power generation of the hybrid electric vehicle, has high power generation efficiency, and is helpful for meeting the driving mileage requirement of a user on the whole vehicle, thereby improving the user experience.

A second object of the present invention is to provide a hybrid vehicle.

A third object of the present invention is to provide a power generation control method of a hybrid vehicle.

A fourth object of the present invention is to propose a computer readable storage medium.

To achieve the above object, an embodiment of a first aspect of the present invention provides a power system of a hybrid vehicle, including: an engine that outputs power to wheels of the hybrid vehicle through a clutch; a power motor for outputting a driving force to wheels of the hybrid vehicle; the power battery is used for supplying power to the power motor; the auxiliary motor is connected with the engine and is respectively connected with the power motor and the power battery, and the auxiliary motor is driven by the engine to generate electricity; the control module is used for acquiring the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle, and controlling the auxiliary motor to enter a corresponding power generation mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the power generation mode comprises an in-situ power generation mode, a series power generation mode and a series-parallel power generation mode.

According to the power system of the hybrid electric vehicle, which is provided by the embodiment of the invention, the engine outputs power to wheels of the hybrid electric vehicle through the clutch; the power motor outputs driving force to wheels of the hybrid electric vehicle; the power battery supplies power to the power motor; the auxiliary motor generates electricity under the drive of the engine; the control module acquires the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle, and controls the auxiliary motor to enter a corresponding power generation mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the power generation mode comprises an in-situ power generation mode, a serial power generation mode and a serial power generation mode. Therefore, full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the running mileage of the whole vehicle can be met, and the user experience is improved.

In order to achieve the above object, a second aspect of the present invention provides a hybrid electric vehicle, including the power system of the hybrid electric vehicle.

According to the hybrid electric vehicle provided by the embodiment of the invention, through the power system of the hybrid electric vehicle, the full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the driving mileage of the whole vehicle can be met, and the user experience is further improved.

To achieve the above object, an embodiment of a third aspect of the present invention provides a power generation control method for a hybrid vehicle, the power generation control method comprising the steps of: acquiring the current state of a clutch of the hybrid electric vehicle, the SOC value of a power battery of the hybrid electric vehicle and the speed of the hybrid electric vehicle; and controlling a secondary motor of the hybrid electric vehicle to enter a corresponding mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the secondary motor generates power under the drive of the engine, and the power generation modes comprise an in-situ power generation mode, a series power generation mode and a series-parallel power generation mode.

According to the power generation control method of the hybrid electric vehicle, the current state of the clutch of the hybrid electric vehicle, the SOC value of the power battery of the hybrid electric vehicle and the speed of the hybrid electric vehicle are obtained, and then the auxiliary motor of the hybrid electric vehicle is controlled to enter a corresponding mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the auxiliary motor generates power under the drive of an engine, and the power generation mode comprises an in-situ power generation mode, a series power generation mode and a series-parallel power generation mode. Therefore, full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the running mileage of the whole vehicle can be met, and the user experience is improved.

To achieve the above object, a fourth aspect of the present invention provides a computer-readable storage medium having instructions stored therein, which when executed, the hybrid vehicle performs the power generation control method.

According to the computer readable storage medium, the instructions are stored in the computer readable storage medium, when the processor of the hybrid electric vehicle executes the instructions, the hybrid electric vehicle executes the power generation control method, so that the full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the running mileage of the whole vehicle can be met, and the user experience is further improved.

Drawings

FIG. 1 is a block diagram of a powertrain of a hybrid vehicle according to one embodiment of the present invention;

fig. 2a is a schematic structural view of a power system of a hybrid vehicle according to an embodiment of the present invention;

fig. 2b is a schematic structural view of a power system of a hybrid vehicle according to another embodiment of the present invention;

FIG. 3 is a block diagram of a powertrain of a hybrid vehicle according to one embodiment of the present invention;

fig. 4 is a schematic structural view of a power system of a hybrid vehicle according to an embodiment of the present invention;

FIG. 5 is a flow chart of a power generation and regulation control of a powertrain of a hybrid vehicle according to one embodiment of the present invention;

FIG. 6 is a flow chart of power generation control of a powertrain of a hybrid vehicle according to one embodiment of the present invention;

fig. 7 is a block diagram of a hybrid vehicle according to an embodiment of the present invention;

fig. 8 is a flowchart of a power generation control method of a hybrid vehicle according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Fig. 1 is a block diagram of a power system of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 1, the power system 100 of the hybrid vehicle includes: an engine 1, a power motor 2, a power battery 3, a sub-motor 4 and a control module 101.

According to one embodiment of the present invention, the hybrid vehicle may be a PHEV (Plug-in Hybrid Electric Vehicle) type hybrid vehicle.

Referring to fig. 1, an engine 1 outputs power to wheels 7 of a hybrid vehicle through a clutch 6; the power motor 2 is for outputting driving force to wheels 7 of the hybrid vehicle. That is, either one of the engine 1 and the power motor 2 may output power to the wheels 7 alone, or the engine 1 and the power motor 2 may output power to the wheels 7 at the same time. In this embodiment, the clutch 6 is a double clutch, and can be connected to the drive shafts of the engine 1, the power motor 2 and the wheels 7, respectively.

The auxiliary motor 4 is connected with the engine 1, for example, referring to fig. 2a and 2b, the auxiliary motor 4 can be connected with the engine 1 through a gear train end of the engine 1, the auxiliary motor 4 is also respectively connected with the power motor 2 and the power battery 3, and when the auxiliary motor 4 is driven by the engine 1 to generate electricity, the auxiliary motor 4 is used for charging the power battery 3 and/or supplying power to the power motor 2, wherein the power battery 3 can be used for supplying power to the power motor 2. It should be understood that the engine 1 may drive the sub-motor 4 to generate electricity while outputting power to the wheels 7, or may drive the sub-motor 4 to generate electricity alone.

The control module 101 is used for controlling a power system of the hybrid electric vehicle, for example, controlling the engine 1 to drive the auxiliary motor 4 to generate electricity.

Further, referring to fig. 3, the power system 100 of the hybrid electric vehicle may further include a DC-DC converter 5, the sub-motor 4 is further connected to the DC-DC converter 5, and the sub-motor 4 may further supply power to the DC-DC converter 5 when generating power under the driving of the engine 1.

In some embodiments, the secondary motor 4 may be a BSG (Belt-driven start/generator integrated motor) motor. The sub-motor 4 is a high-voltage motor, for example, the generated voltage of the sub-motor 4 is equal to the voltage of the power battery 3, so that the power generated by the sub-motor 4 can directly charge the power battery 3 without voltage conversion, and can also directly supply power to the power motor 2 and/or the DC-DC converter 5. The auxiliary motor 4 also belongs to a high-efficiency generator, for example, the auxiliary motor 4 is driven to generate electricity at the idle speed of the engine 1, so that higher electricity generation efficiency can be realized, and the normal electricity generation efficiency is improved.

In some examples, referring to fig. 2a, when the engine 1 and the power motor 2 drive the same wheel together, the power system 100 of the hybrid vehicle further includes a final drive 80 and a transmission 90, wherein the engine 1 outputs power to a first wheel of the hybrid vehicle, such as a pair of front wheels 71, through the clutch 6, the transmission 90, and the final drive 80, and the power motor 2 outputs driving force to the first wheel of the hybrid vehicle, such as a pair of front wheels 71, through the final drive 80. Wherein the clutch 6 and the transmission 90 may be integrally provided.

In other examples, referring to fig. 2b, when the engine 1 drives the first wheels and the power motor 2 drives the second wheels, the power system 100 of the hybrid vehicle further includes a first transmission 91 and a second transmission 92, wherein the engine 1 outputs power to the first wheels of the hybrid vehicle, such as the pair of front wheels 71, through the clutch 6 and the first transmission 91, and the power motor 2 outputs driving force to the second wheels of the hybrid vehicle, such as the pair of rear wheels 72, through the second transmission 92. Wherein the clutch 6 and the first transmission 91 may be integrally provided.

Further, in some embodiments of the present invention, as shown in fig. 2a, 2b, and 4, the power system 100 of the hybrid vehicle further includes a first controller 41 controlling the sub-motor 4 and a second controller 21 controlling the power motor 2, and the sub-motor 4 is connected to the power battery 3 through the first controller 41 and is connected to the power motor 2 through the first controller 41 and the second controller 21.

Specifically, the first controller 41 is connected to the second controller 21 and the power battery 3, respectively, and the first controller 41 may have an AC-DC conversion unit that may generate an alternating current when the sub-motor 4 generates electricity, and the AC-DC conversion unit may convert the alternating current generated by the sub-motor 4 into a high voltage direct current, for example, 600V high voltage direct current, so as to at least one of charge the power battery 3 and supply the power to the power motor 2.

Similarly, the second controller 21 may have a DC-AC conversion unit, and the first controller 41 may convert the alternating current generated by the sub-motor 4 into high voltage direct current, and the DC-AC conversion unit may convert the high voltage direct current converted by the first controller 41 into alternating current to supply the power motor 2 with power.

In this embodiment, the first controller 41 has a first dc terminal and the second controller 21 has a second dc terminal. The first dc terminal of the first controller 41 may be connected to the power battery 3, so that the first controller 41 outputs high-voltage dc power to the power battery 3 through the first dc terminal to charge the power battery 3. The first dc terminal of the first controller 41 may be connected to the second dc terminal of the second controller 21, so that the first controller 41 outputs high voltage dc power to the second controller 21 through the first dc terminal to supply power to the power motor 2.

Further, referring to fig. 2a, 2b, and 4, the first dc terminal of the first controller 41 and the power battery 3 may be connected to the electric device 10 (including the low-voltage electric device and the high-voltage electric device) in the hybrid vehicle to supply power to the electric device 10. When the first DC terminal of the first controller 41 and the power battery 3 are connected to the piezoelectric device, the DC-DC converter 5 is required to convert the high-voltage DC power output from the power battery 3 and/or the high-voltage DC power output from the sub-motor 4 by the first controller 41 into low-voltage DC power.

Among them, the high-voltage electric appliance includes, but is not limited to, a car lamp, a radio, a car bluetooth, etc., and the high-voltage electric appliance includes, but is not limited to, an air conditioner compressor, a PTC (Positive Temperature Coefficient ) heater, the second motor controller 21, etc.

It should be noted that, in the embodiment of the present invention, the low voltage may refer to a voltage of 12V (volts) or 24V, and the high voltage may refer to a voltage of 600V, but is not limited thereto.

In some embodiments of the present invention, referring to fig. 1 and 3, a control module 101 of a power system 100 of a hybrid electric vehicle is respectively connected to a clutch 6, a power battery 3 and a generator 1, and is used for acquiring a current state of the clutch 6, an SOC value of the power battery 3 and a speed of the hybrid electric vehicle, and controlling a sub-motor 4 to enter a corresponding power generation mode according to the current state of the clutch 6, the SOC value of the power battery 3 and the speed of the hybrid electric vehicle to supply power to the whole vehicle and/or charge the power battery 3, wherein the power generation mode includes a power generation in place mode, a power generation in series mode and a power generation in series mode.

In this embodiment, the power generation mode of the hybrid vehicle may be specifically defined as follows:

in-situ power generation mode, namely, a power generation mode in which the engine 1 only participates in power generation when the hybrid electric vehicle is in a stationary state;

In a series power generation mode, namely a power generation mode that the engine 1 only participates in power generation and does not participate in power output when the hybrid electric vehicle is in a running state;

in the hybrid power generation mode, i.e., in the running state of the hybrid vehicle, the engine 1 is involved in both power generation and power output.

It should be understood that the control module 101 may be an integration of a controller having a control function in a hybrid vehicle, for example, an integration of a vehicle controller of a hybrid vehicle, the first controller 41 and the second controller 21 in the embodiment of fig. 3, or the like, but is not limited thereto.

Specifically, when the hybrid vehicle is operating in the HEV (Hybrid Electric Vehicle, hybrid) mode, the clutch controller may control the clutch 6 to be in a disengaged state or an engaged state according to the current operating condition of the hybrid vehicle, the driver's intention, the shift schedule, and the like.

When the clutch 6 is in a disengaged state, if the SOC value of the power battery 3 is less than or equal to a first preset value and the vehicle speed of the hybrid electric vehicle is 0, the control module 101 controls the hybrid electric vehicle to enter the in-situ power generation mode, so as to meet the power consumption requirement of the whole vehicle in a static state by controlling the engine 1 to drive the auxiliary motor 4 to generate power and store the redundant electric quantity into the power battery 3, and controls the hybrid electric vehicle to exit the in-situ power generation mode until the SOC value of the power battery 3 is greater than or equal to a second preset value, wherein the second preset value is greater than the first preset value.

Alternatively, the first preset value and the second preset value may be set in advance according to the power battery capacity.

When the clutch 6 is in a disengaged state, if the SOC value of the power battery 3 is less than or equal to a third preset value and the vehicle speed of the hybrid electric vehicle is less than or equal to a first preset vehicle speed, the control module 101 controls the hybrid electric vehicle to enter a series power generation mode so as to compensate for the power consumption of the whole vehicle under series running by controlling the engine 1 to drive the auxiliary motor 4 to generate power and store the surplus electric quantity into the power battery 3, until the SOC value of the power battery 3 is greater than or equal to a fourth preset value or the vehicle speed of the hybrid electric vehicle is greater than or equal to a second preset vehicle speed, and controls the hybrid electric vehicle to exit the series power generation mode, wherein the third preset value is greater than the second preset value, and the fourth preset value is greater than the third preset value and the second preset vehicle speed is greater than the first preset vehicle speed.

Alternatively, the first preset vehicle speed and the second preset vehicle speed may be preset according to an actual running condition of the hybrid vehicle, and the third preset value and the fourth preset value may be preset according to a capacity of the power battery.

When the clutch 6 is in a combined state, the engine 1 drives the auxiliary motor 4 to generate electricity and simultaneously outputs power to the wheels 7 through the clutch 6, if the SOC value of the power battery 3 is smaller than or equal to a fifth preset value and the speed of the hybrid electric vehicle is smaller than or equal to a third preset speed, the control module 101 controls the hybrid electric vehicle to enter a hybrid power generation mode so as to compensate the electricity consumption of the whole vehicle under the hybrid driving and store the redundant electric quantity into the power battery 3 by controlling the engine 1 to drive the auxiliary motor 4 to generate electricity until the SOC value of the power battery 3 is larger than or equal to the sixth preset value, and controls the hybrid electric vehicle to exit the hybrid power generation mode, wherein the fifth preset value is larger than the fourth preset value, the sixth preset value is larger than the fifth preset value, and the third preset speed is larger than the second preset speed.

Alternatively, the third preset vehicle speed may be preset according to an actual running condition of the hybrid vehicle, and the fifth preset value and the sixth preset value may be preset according to a capacity of the power battery.

When the hybrid vehicle is operated in the fuel-only mode, only the engine 1 is operated to provide power output, the motor 2 is not operated, and the clutch 6 is engaged. At this time, if the SOC value of the power battery 3 cannot meet the current power demand, the control module 101 may control the hybrid vehicle to enter a corresponding power generation mode according to the SOC value of the current power battery 3 and the vehicle speed, and the control rules are as described above.

When the hybrid Vehicle is operating in the EV (Electric Vehicle) mode, only the power motor 2 is operated to provide the power output, and the clutch 6 is in the disengaged state. At this time, if the SOC value of the power battery 3 cannot meet the current power demand, the control module 101 may control the hybrid vehicle to enter a corresponding power generation mode according to the SOC value of the current power battery 3 and the vehicle speed, and the control rules are as described above.

In some embodiments of the invention, the power motor 2 may also function as a generator, i.e. the control module 101 may control the power motor 2 to generate electricity.

Further, after the sub-motor 4 enters the in-situ power generation mode, if the sub-motor 4 has a fault, the control module 101 controls the engine 1 to drive the power motor 2 to generate power. After the sub-motor 4 enters the series-parallel power generation mode, if the sub-motor 4 has a fault, the control module 101 controls the power motor 2 to generate power and controls the engine 1 to output power to the wheels 7 of the hybrid electric vehicle through the clutch 6.

It should be noted that, whether the sub-motor 4 has a fault may be detected by the control module 101, such as a vehicle controller of a hybrid vehicle.

In addition, as described above, the first controller 41 is connected to the electric device 10, and when the power motor 2, the second controller 21 and the power battery 3 all fail, the control module 101 can control the engine 1 to drive the sub-motor 4 to generate electricity so as to supply power to the electric device 10 through the first controller 41, so that the hybrid vehicle runs in the pure fuel mode. It is understood that whether or not there is a failure in the power motor 2, the second controller 21, and the power battery 3 may be detected by the control module 101 such as a vehicle control unit of a hybrid vehicle. Therefore, the auxiliary motor 4 is provided with a single power supply channel, when the power motor 2, the second controller 21 and the power battery 3 fail, electric driving cannot be achieved, at the moment, the power consumption of the whole vehicle can be ensured through the single power supply channel of the auxiliary motor 4, the whole vehicle can be ensured to run in a pure fuel mode, and the running mileage requirement of a user on the whole vehicle can be met.

In some embodiments of the present invention, referring to fig. 4, the first controller 41 may be connected to the sub-motor 4 through the relay 8, and the first controller 41 may be configured to acquire a voltage stabilizing control command and a target voltage, and execute the voltage stabilizing control command to make an absolute value of a difference between a voltage generated and outputted by the sub-motor 4 and the target voltage smaller than a preset voltage difference. It will be appreciated that the range of values for the predetermined pressure differential is small, such as values within the [ -2V,2V ] interval.

Wherein, the control module 101 is further configured to control the relay 8 to be turned off if the rotation speed of the sub-motor 4 is greater than the first preset rotation speed when the sub-motor 4 is not operating (i.e. turned off), so as to prevent the device from being damaged due to excessive back electromotive force.

Alternatively, the first preset rotational speed may be preset according to the actual operation of the sub-motor 4.

In some embodiments, referring to fig. 4, the power battery 3 may also be connected to the power motor 2, the sub-motor 4, and the electrical device 10, respectively, through a contactor 9.

Referring to fig. 5, the control module 101 is further configured to control the contactor 9 to be disconnected and control the engine 1 to start when the power battery 3 fails, and control the engine 1 to drive the auxiliary motor 4 to generate power, so that electricity consumption of the whole vehicle can be ensured, the whole vehicle can be ensured to run in a pure fuel mode, and the running mileage requirement of the user on the whole vehicle can be met. In addition, during the power generation of the sub-motor 4, if the first controller 41 obtains the voltage stabilizing control command and the target voltage, the first controller 41 executes the voltage stabilizing control command to make the absolute value of the difference between the voltage generated and output by the sub-motor 4 and the target voltage smaller than the preset voltage difference, so as to realize voltage stabilizing power supply and ensure the normal operation of the high-voltage system.

It will be appreciated that the voltage generated by the sub-motor 4 may be acquired by a voltage meter or the like installed in the circuit to be compared with the target voltage, thereby controlling the absolute value of the difference between the two to be smaller than the preset voltage difference.

In the case where the power battery 2 is operating normally, the operating voltage of the electrical device 10 (particularly, the high-voltage electrical device) may be provided by the power battery 2, and at this time, the first controller 41 may not control the sub-motor 4 to perform voltage stabilization, but only perform power generation to supply power to the power battery 3 and/or the power motor 2.

In the embodiment of the present invention, after the sub-motor 4 enters the corresponding power generation mode, the control module 101 further adjusts the power generation P1 of the sub-motor 4 according to the whole vehicle required power P2 of the hybrid electric vehicle and the charging power P3 of the power battery 3.

Specifically, the control module 101 may adjust the generated power P1 of the sub-motor 4 according to the following formula:

P1＝P2+P3，

wherein p2=p11+p21, P1 is the power generated by the sub-motor 4, P2 is the power required by the whole vehicle, P3 is the charging power of the power battery 3, P11 is the power for driving the whole vehicle, and P21 is the power of the electrical equipment.

It is understood that the electrical device power P21 may include power required by the high voltage electrical device and/or the power required by the electrical device.

It should be noted that the whole vehicle driving power P11 may include an output power of the power motor 2, and the control module 101 may obtain the whole vehicle driving power P11 according to a preset accelerator-torque curve of the power motor 2 and a rotation speed of the power motor 2, where the preset accelerator-torque curve may be determined when the hybrid electric vehicle performs power matching. In addition, the control module 101 may obtain the electrical device power P21 in real time according to the electrical device operated by the whole vehicle, for example, calculate the electrical device power P21 through DC consumption on the bus. Further, the control module 101 may acquire the charging power P3 of the power battery 3 according to the SOC value of the power battery 3. Assuming that the vehicle drive power p11=b1 kw, the electric device power p21=b2 kw, and the charge power p3=b3 kw of the power battery 3, the generated power of the sub-motor 4=b1+b2+b3.

Specifically, during the running of the hybrid vehicle, the control module 101 may obtain the charging power P3 of the power battery 3, the entire vehicle driving power P11, and the electrical equipment power P21, and take the sum of the charging power P3 of the power battery 3, the entire vehicle driving power P11, and the electrical equipment power P21 as the power generation power P1 of the sub motor 4, so that the control module 101 may adjust the power generation power P1 of the sub motor 4 according to the calculated P1 value, for example, the control module 101 may control the output torque and the rotation speed of the engine 1 according to the calculated P1 value, so as to adjust the power generated by driving the sub motor 4 by the engine 1.

Based on the above description, referring to fig. 6, when the hybrid vehicle is started, the control module 101 acquires parameters such as the current state of the clutch 6, the SOC value of the power battery 3 (no malfunction), the vehicle speed, and the like, and determines whether the power battery 3, the power motor 2, and the sub-motor 4 are malfunctioning, and the like, and further determines whether the power system 100 is currently permitted to generate electricity according to the above parameters and the malfunctioning state. When the power generation is judged not to be allowed, the control module 101 controls the power system 100 not to generate power; when it is determined that power generation is permitted, the control module 101 further selects a power generation mode including an in-situ power generation mode, a series power generation mode, and a series-parallel power generation mode.

When entering the in-situ or series power generation mode, the control module 101 controls the rotation speed of the engine according to the calculated P1 value, and keeps the rotation speed stable so as to regulate the power of the engine 1 driving the auxiliary motor 4 to generate power. When the hybrid power generation mode is entered, the control module 101 controls the output torque of the engine according to the calculated P1 value, so as to regulate the power of the engine 1 driving the auxiliary motor 4 to generate power.

In summary, according to the power system of the hybrid electric vehicle provided by the embodiment of the invention, the control module controls the auxiliary motor to enter the corresponding power generation mode according to the current state of the clutch, the SOC value of the power battery and the vehicle speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, so that the power system of the hybrid electric vehicle can realize all-condition power generation of the hybrid electric vehicle, has high power generation efficiency, is beneficial to meeting the driving mileage requirement of a user on the whole vehicle, and further improves the user experience.

The embodiment of the invention also provides a hybrid electric vehicle.

Fig. 7 is a block diagram of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 7, the hybrid vehicle 200 includes the power system 100 of the hybrid vehicle of the above-described embodiment.

Based on the hybrid electric vehicle of the above embodiment, the present invention proposes a power generation control method of the hybrid electric vehicle.

Fig. 8 is a flowchart of a power generation control method of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 8, the power generation control method of the hybrid vehicle includes the steps of:

s10, acquiring the current state of a clutch of the hybrid electric vehicle, the SOC value of a power battery of the hybrid electric vehicle and the speed of the hybrid electric vehicle.

It should be noted that, the SOC value of the power battery may be acquired by the battery management system of the hybrid electric vehicle to obtain the SOC value of the power battery. The speed of the hybrid vehicle can be obtained by a rotation speed sensor.

S20, controlling a secondary motor of the hybrid electric vehicle to enter a corresponding mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the secondary motor generates power under the drive of the engine, and the power generation mode comprises an in-situ power generation mode, a series power generation mode and a series-parallel power generation mode.

Specifically, when the clutch is in a disengaged state, if the SOC value of the power battery is less than or equal to a first preset value and the vehicle speed of the hybrid electric vehicle is 0, the hybrid electric vehicle is controlled to enter a power generation in situ mode, so that the power consumption requirement of the whole vehicle in a static state is met by controlling the engine to drive the auxiliary motor to generate power and surplus electric quantity is stored in the power battery until the SOC value of the power battery is greater than or equal to a second preset value, and the hybrid electric vehicle is controlled to exit the power generation in situ mode, wherein the second preset value is greater than the first preset value.

Further, when the clutch is in a disengaged state, if the SOC value of the power battery is less than or equal to a third preset value and the vehicle speed of the hybrid electric vehicle is less than or equal to a first preset vehicle speed, the hybrid electric vehicle is controlled to enter a series power generation mode, so that the power consumption of the whole vehicle under series driving is compensated by controlling the engine to drive the auxiliary motor to generate power, and the surplus electric quantity is stored in the power battery until the SOC value of the power battery is greater than or equal to a fourth preset value or the vehicle speed of the hybrid electric vehicle is greater than or equal to a second preset vehicle speed, and the hybrid electric vehicle is controlled to exit the series power generation mode, wherein the third preset value is greater than the second preset value, the fourth preset value is greater than the third preset value, and the second preset vehicle speed is greater than the first preset vehicle speed.

Further, when the clutch is in a combined state, the engine drives the auxiliary motor to generate electricity and simultaneously outputs power to wheels of the hybrid electric vehicle through the clutch, if the SOC value of the power battery is smaller than or equal to a fifth preset value and the speed of the hybrid electric vehicle is smaller than or equal to a third preset speed, the hybrid electric vehicle is controlled to enter a hybrid power generation mode, the engine is controlled to drive the auxiliary motor to generate electricity so as to compensate the electricity consumption of the whole vehicle under hybrid driving and store redundant electric quantity into the power battery until the SOC value of the power battery is larger than or equal to a sixth preset value, and the hybrid electric vehicle is controlled to exit the hybrid power generation mode, wherein the fifth preset value is larger than a fourth preset value, the sixth preset value is larger than the fifth preset value, and the third preset speed is larger than the second preset speed.

Alternatively, the third preset vehicle speed may be preset according to the actual running condition of the hybrid vehicle, and the fifth preset value and the sixth preset value may be preset according to the capacity of the power battery.

After the auxiliary motor enters the in-situ power generation mode, if the auxiliary motor has a fault, the control module controls the engine to drive the power motor to generate power.

Further, after the auxiliary motor enters the series-parallel power generation mode, if the auxiliary motor has a fault, the power motor of the hybrid electric vehicle is controlled to generate power, and the engine is controlled to output power to wheels of the hybrid electric vehicle through the clutch.

In some embodiments, the power system of the hybrid vehicle further comprises: the power generation control method further comprises the following steps of: after the auxiliary motor does not work (namely, wave is turned off), if the rotating speed of the auxiliary motor is larger than a first preset rotating speed, the relay is controlled to be turned off; the first controller is used for acquiring a voltage stabilizing control instruction and a target voltage, and executing the voltage stabilizing control instruction through the first controller so that the absolute value of the difference between the voltage generated and output by the auxiliary motor and the target voltage is smaller than a preset pressure difference.

Specifically, the preset pressure difference may be preset by experimental results.

In some embodiments, the power battery may be connected to the power motor, the sub-motor, and the plurality of electrical devices through contactors, respectively, and the power generation control method further includes: when the power battery fails, the contactor is controlled to be disconnected, the engine is controlled to start, and the engine is controlled to drive the auxiliary motor to generate electricity.

In some embodiments, the power generation control method of the hybrid vehicle further includes: after the auxiliary motor enters a corresponding power generation mode, the power generation power of the auxiliary motor is regulated according to the whole vehicle required power of the hybrid electric vehicle and the charging power of the power battery, and the power generation power regulation formula of the auxiliary motor is as follows:

P1＝P2+P3，

wherein p2=p11+p21, P1 is the power generated by the sub-motor, P2 is the power required by the whole vehicle, P3 is the charging power of the power battery, P11 is the power for driving the whole vehicle, and P21 is the power of the electrical equipment.

It should be noted that, for other specific implementations of the power generation control method of the hybrid vehicle according to the embodiment of the present invention, reference may be made to specific implementations of the power system of the hybrid vehicle according to the foregoing embodiment of the present invention, and in order to reduce redundancy, details are not repeated herein.

In summary, according to the power generation control method of the hybrid electric vehicle provided by the embodiment of the invention, the current state of the clutch of the hybrid electric vehicle, the SOC value of the power battery of the hybrid electric vehicle and the speed of the hybrid electric vehicle are obtained, and then the auxiliary motor of the hybrid electric vehicle is controlled to enter a corresponding mode according to the current state of the clutch, the SOC value of the power battery and the speed of the hybrid electric vehicle so as to supply power to the whole vehicle and/or charge the power battery, wherein the auxiliary motor generates power under the drive of the engine, and the power generation mode comprises an in-situ power generation mode, a series power generation mode and a series-parallel power generation mode. Therefore, full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the running mileage of the whole vehicle can be met, and the user experience is improved.

The present invention also proposes a computer-readable storage medium having instructions stored therein, which when executed by a processor of a hybrid vehicle, the hybrid vehicle performs the power generation control method of the above-described embodiment.

In summary, according to the computer readable storage medium of the embodiment of the invention, when the processor of the hybrid electric vehicle executes the instruction, the hybrid electric vehicle executes the power generation control method, so that the full-working-condition power generation of the hybrid electric vehicle can be realized, the power generation efficiency is high, the requirements of a user on the driving mileage of the whole vehicle can be met, and the user experience is further improved.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A power system of a hybrid vehicle, comprising:

an engine that outputs power to wheels of the hybrid vehicle through a clutch;

A power motor for outputting a driving force to wheels of the hybrid vehicle;

the power battery is used for supplying power to the power motor;

the auxiliary motor is connected with the engine and is respectively connected with the power motor and the power battery, and the auxiliary motor is driven by the engine to generate electricity;

the control module is also used for: when the hybrid electric vehicle runs in a pure electric mode, if the SOC value of the power battery is smaller than or equal to a third preset value and the speed of the hybrid electric vehicle is smaller than or equal to a first preset value when the clutch is in a separated state, the hybrid electric vehicle is controlled to enter a series power generation mode, so that the power consumption of the whole vehicle in series running is compensated by controlling the engine to drive the auxiliary motor to generate power and surplus electric quantity is stored in the power battery until the SOC value of the power battery is larger than or equal to a fourth preset value or the speed of the hybrid electric vehicle is larger than or equal to a second preset value, and the hybrid electric vehicle is controlled to exit the series power generation mode, wherein the fourth preset value is larger than the third preset value and the second preset speed is larger than the first preset speed.

2. The power system of a hybrid vehicle of claim 1, wherein the control module is further configured to: when the clutch is in a separation state, if the SOC value of the power battery is smaller than or equal to a first preset value and the speed of the hybrid electric vehicle is 0, the hybrid electric vehicle is controlled to enter an in-situ power generation mode, so that the power consumption requirement of the whole vehicle in a static state is met by controlling the engine to drive the auxiliary motor to generate power and surplus electric quantity is stored in the power battery, and the hybrid electric vehicle is controlled to exit the in-situ power generation mode until the SOC value of the power battery is larger than or equal to a second preset value, wherein the second preset value is larger than the first preset value and the third preset value is larger than the second preset value.

3. The power system of a hybrid vehicle of claim 2, wherein the control module is further configured to: when the clutch is in a combined state, the engine drives the auxiliary motor to generate power and outputs power to wheels of the hybrid electric vehicle through the clutch, if the SOC value of the power battery is smaller than or equal to a fifth preset value and the speed of the hybrid electric vehicle is smaller than or equal to a third preset speed, the hybrid electric vehicle is controlled to enter a hybrid power generation mode, the engine is controlled to drive the auxiliary motor to generate power so as to compensate the power consumption of the whole vehicle under the hybrid driving and store redundant electric quantity into the power battery, and the hybrid electric vehicle is controlled to exit the hybrid power generation mode until the SOC value of the power battery is larger than or equal to a sixth preset value, wherein the fifth preset value is larger than the fourth preset value, the sixth preset value is larger than the fifth preset value, and the third preset speed is larger than the second preset speed.

4. The power system of the hybrid electric vehicle according to claim 2, wherein the control module controls the engine to drive the power motor to generate electricity if the sub-motor fails after the sub-motor enters the in-situ power generation mode.

5. A power system of a hybrid vehicle as set forth in claim 3, wherein said control module controls said power motor to generate power and controls said engine to output power to wheels of said hybrid vehicle through said clutch if said sub-motor fails after said sub-motor enters said series-parallel power generation mode.

6. The power system of a hybrid vehicle as set forth in claim 3, further comprising:

the first controller is connected with the auxiliary motor through a relay and is used for acquiring a voltage stabilizing control instruction and a target voltage and executing the voltage stabilizing control instruction so that the absolute value of the difference value between the voltage generated and output by the auxiliary motor and the target voltage is smaller than a preset pressure difference;

and the control module is also used for controlling the relay to be turned off if the rotating speed of the auxiliary motor is larger than a first preset rotating speed after the auxiliary motor is turned off.

7. The power system of the hybrid electric vehicle according to claim 3, wherein the power battery is connected to the power motor, the sub-motor and a plurality of electric devices, respectively, through contactors; the system further includes a first controller that controls the sub-motor and a second controller that controls the power motor; the first controller is connected with the plurality of electrical equipment;

the control module is further used for controlling the contactor to be disconnected and controlling the engine to start when the power battery, the second controller and the power motor are in faults, controlling the engine to drive the auxiliary motor to generate electricity, supplying power for the plurality of electrical equipment through the first controller, enabling the hybrid electric vehicle to run in a pure fuel mode, wherein the pure fuel mode provides power output for the engine, the power motor does not work, and the clutch is in a combined state.

8. A power system of a hybrid vehicle according to any one of claims 1-3, wherein the control module is further configured to: after the auxiliary motor enters a corresponding power generation mode, the power generation power of the auxiliary motor is regulated according to the whole vehicle required power of the hybrid electric vehicle and the charging power of the power battery, and the power generation power of the auxiliary motor is regulated according to the following formula:

P1=P2+P3，

Wherein p2=p11+p21, P1 is the power generated by the auxiliary motor, P2 is the power required by the whole vehicle, P3 is the charging power of the power battery, P11 is the power for driving the whole vehicle, and P21 is the power of the electrical equipment.

9. A hybrid vehicle comprising a power system of the hybrid vehicle according to any one of claims 1-8.

10. The power generation control method of the hybrid electric vehicle is characterized by being applied to a power system of the hybrid electric vehicle and comprising the following steps of:

acquiring the current state of a clutch of the hybrid electric vehicle, the SOC value of a power battery of the hybrid electric vehicle and the speed of the hybrid electric vehicle;

when the hybrid electric vehicle runs in a pure electric mode, if the SOC value of the power battery is smaller than or equal to a third preset value and the speed of the hybrid electric vehicle is smaller than or equal to a first preset speed when the clutch is in a separation state, the hybrid electric vehicle is controlled to enter a series power generation mode, so that the power consumption of the whole vehicle under series driving is compensated by controlling the engine to drive the auxiliary motor to generate power and surplus electric quantity is stored in the power battery until the SOC value of the power battery is larger than or equal to a fourth preset value or the speed of the hybrid electric vehicle is larger than or equal to a second preset speed, and the hybrid electric vehicle is controlled to exit the series power generation mode, wherein the fourth preset value is larger than the third preset value and the second preset speed is larger than the first preset speed.

11. The power generation control method of a hybrid vehicle according to claim 10, wherein when the clutch is in a disengaged state, if the SOC value of the power battery is less than or equal to a first preset value and the vehicle speed of the hybrid vehicle is 0, the hybrid vehicle is controlled to enter a power generation in place mode to satisfy a power consumption requirement of the whole vehicle in a stationary state and store excess power into the power battery by controlling the engine to drive the sub-motor to generate power until the SOC value of the power battery is greater than or equal to a second preset value, wherein the second preset value is greater than the first preset value and the third preset value is greater than the second preset value.

12. The power generation control method of a hybrid vehicle according to claim 11, wherein when the clutch is in a combined state, the engine drives the sub-motor to generate power while outputting power to wheels of the hybrid vehicle through the clutch, if the SOC value of the power battery is less than or equal to a fifth preset value and the vehicle speed of the hybrid vehicle is less than or equal to a third preset vehicle speed, the hybrid vehicle is controlled to enter a series-parallel power generation mode, so that the power consumption of the entire vehicle during series-parallel driving is compensated by controlling the engine to drive the sub-motor to generate power and surplus power is stored in the power battery until the SOC value of the power battery is greater than or equal to a sixth preset value, and the hybrid vehicle is controlled to exit the series-parallel power generation mode, wherein the fifth preset value is greater than the fourth preset value, the sixth preset value is greater than the fifth preset value, and the third preset vehicle speed is greater than the second preset vehicle speed.

13. The power generation control method of a hybrid vehicle according to claim 11, wherein after the sub-motor enters the in-situ power generation mode, if the sub-motor fails, a control module controls the engine to drive the power motor to generate power.

14. The power generation control method of a hybrid vehicle according to claim 12, characterized by further comprising:

after the auxiliary motor enters the series-parallel power generation mode, if the auxiliary motor has a fault, the power motor of the hybrid electric vehicle is controlled to generate power, and the engine is controlled to output power to wheels of the hybrid electric vehicle through a clutch.

15. The power generation control method of a hybrid vehicle according to claim 12, wherein the power system of the hybrid vehicle further includes a first controller connected to the sub-motor through a relay, the method further comprising:

after the auxiliary motor is turned off, if the rotating speed of the auxiliary motor is larger than a first preset rotating speed, the relay is controlled to be turned off;

the first controller is used for acquiring a voltage stabilizing control instruction and a target voltage, and executing the voltage stabilizing control instruction through the first controller so that the absolute value of the difference between the voltage generated and output by the auxiliary motor and the target voltage is smaller than a preset pressure difference.

16. The power generation control method of a hybrid vehicle according to claim 12, wherein the power battery is connected to the power motor, the sub-motor, and the plurality of electric devices, respectively, through contactors, the system further comprising a first controller that controls the sub-motor and a second controller that controls the power motor; the first controller is connected with the plurality of electrical equipment; the method further comprises the steps of:

when the power battery, the second controller and the power motor all fail, the contactor is controlled to be disconnected, the engine is controlled to be started, the engine is controlled to drive the auxiliary motor to generate power, the first controller supplies power for the plurality of electrical equipment, so that the hybrid electric vehicle runs in a pure fuel mode, the pure fuel mode provides power output for the engine, the power motor does not work, and the clutch is in a combined state.

17. The power generation control method of a hybrid vehicle according to any one of claims 11 to 12, characterized by further comprising:

after the auxiliary motor enters a corresponding power generation mode, the power generation power of the auxiliary motor is regulated according to the whole vehicle required power of the hybrid electric vehicle and the charging power of the power battery, and the power generation power of the auxiliary motor is regulated according to the following formula:

P1=P2+P3，

18. A computer-readable storage medium having instructions stored therein, which when executed, the hybrid vehicle performs the power generation control method of the hybrid vehicle according to any one of claims 10 to 17.