Hybrid vehicle start-up torque distribution method, device, vehicle and medium

Abstract

The application relates to a starting torque distribution method and device of a hybrid vehicle, a vehicle and a medium, wherein the method comprises the following steps: in the case that the vehicle is in a low-temperature starting working condition, determining a first initial distribution target torque of an engine and a second initial distribution target torque of a motor of the vehicle based on current state parameters of the vehicle, so as to control the engine and the motor to improve the output torque respectively; determining a power torque demand and a power generation torque demand of the vehicle based on the current state parameters, and obtaining a first final target torque of the engine and a second final target torque of the motor according to the power torque demand, the power generation torque demand, an actual torque of the engine and a maximum limited discharge power of the motor in the low-temperature starting working condition, so as to perform starting torque distribution. Thus, the technical problem that, in the related art, the hybrid vehicle in a P2 configuration is difficult to guarantee the control precision of the clutch combination process in a low-temperature environment during the starting process by using a starting clutch for control, the smoothness of the vehicle starting process is poor, and the driving experience of a user is affected is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, and particularly relates to a starting torque distribution method and device of a hybrid vehicle, a vehicle and a medium. BACKGROUND

[0002] The single-motor P2 configuration retains the transmission of a traditional vehicle, and the driving mode can be divided into a pure electric mode and a hybrid mode. Compared with the traditional vehicle, the P2 configuration hybrid vehicle has the advantages of better economy and stronger power. In the torque path control of the power system of the P2 configuration hybrid vehicle, the VCU (Vehicle Control Unit) is used as the hub to issue instructions to the ECU (Engine Control Unit), the TCU (Transmission Control Unit) and the MCU (Motor Control Unit) and perform collaborative control.

[0003] In the related art, the hybrid special transmission of the P2 configuration is generally not equipped with a hydraulic torque converter, and the starting clutch is used for control in the starting process. In an extremely low temperature environment, the combustion stability of the engine is poor, and the viscosity of the transmission oil is large, so it is difficult to ensure the control accuracy in the clutch engagement process. Therefore, the smoothness of the entire starting process is poor, and the feeling of stumbling is easily generated, which seriously affects the overall drivability of the vehicle and needs to be improved. SUMMARY

[0004] The present application provides a starting torque distribution method and device of a hybrid vehicle, a vehicle and a medium, to solve the technical problem that in the related art, the P2 configuration hybrid vehicle uses the starting clutch for control in the starting process, and it is difficult to ensure the control accuracy in the clutch engagement process in a low temperature environment, so that the smoothness of the vehicle starting process is poor, and the driving experience of the user is affected.

[0005] The first aspect of the present application provides a starting torque distribution method of a hybrid vehicle, comprising the following steps: in the case that the vehicle is in a low-temperature starting working condition, determining a first initial distribution target torque of an engine and a second initial distribution target torque of a motor of the vehicle based on current state parameters of the vehicle; controlling the engine and the motor to increase output torque based on the first initial distribution target torque and the second initial distribution target torque respectively; determining a power torque demand and a power generation torque demand of the vehicle based on the current state parameters, and obtaining a first final target torque of the engine and a second final target torque of the motor according to the power torque demand, the power generation torque demand, an actual torque of the engine and a maximum limited discharge power of the motor in the low-temperature starting working condition, so as to perform starting torque distribution by using the first final target torque and the second final target torque.

[0006] Optionally, in an embodiment of the present application, the obtaining of the first final target torque of the engine and the second final target torque of the motor according to the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting working condition comprises: calculating an output demand torque of the motor based on the power torque demand, the power generation torque demand and the actual torque; obtaining a maximum discharge capacity of the motor in the low-temperature starting working condition based on the maximum limited discharge power; judging whether the motor meets a preset response condition based on the output demand torque and the maximum discharge capacity; if the motor does not meet the preset response condition, calculating a corresponding engine compensation torque according to the output demand torque and the maximum discharge capacity, and obtaining the first final target torque based on the engine compensation torque and obtaining the second final target torque based on the maximum discharge capacity, otherwise, obtaining the first final target torque based on the first initial distribution target torque and obtaining the second final target torque based on the output demand torque.

[0007] Optionally, in an embodiment of the present application, the judging whether the motor meets the preset response condition based on the output demand torque and the maximum discharge capacity comprises: calculating a maximum output torque of the motor based on a preset ratio and the maximum discharge capacity; judging whether the output demand torque is greater than the maximum output torque; if the output demand torque is greater than the maximum output torque, it is determined that the motor does not meet the preset response condition.

[0008] Optionally, in one embodiment of the present application, after the start-up torque distribution is performed using the first final target torque and the second final target torque, the output torque of the engine is adjusted using a preset torque economy zone, and if the output torque falls within the preset torque economy zone, a preset driving torque distribution strategy is used to perform driving torque distribution.

[0009] Optionally, in one embodiment of the present application, before the first initial distribution target torque of the engine and the second initial distribution target torque of the motor are determined based on the current state parameters of the vehicle, the water temperature of the engine and the oil temperature of the transmission are obtained, it is determined whether the vehicle is in a cold state based on the water temperature and the oil temperature, and if the vehicle is in the cold state, it is determined that the vehicle is in the low-temperature start-up working condition after the vehicle receives an accelerator trigger signal.

[0010] The second aspect embodiment of the present application provides a start-up torque distribution device for a hybrid vehicle, comprising: a determination module configured to determine a first initial distribution target torque of an engine and a second initial distribution target torque of a motor of the vehicle based on current state parameters of the vehicle if the vehicle is in a low-temperature start-up working condition; a control module configured to control the engine and the motor to increase output torque based on the first initial distribution target torque and the second initial distribution target torque, respectively; and a distribution module configured to determine a power torque demand and a power generation torque demand of the vehicle based on the current state parameters, and to obtain a first final target torque of the engine and a second final target torque of the motor according to the power torque demand, the power generation torque demand, an actual torque of the engine, and a maximum limited discharge power of the motor in the low-temperature start-up working condition, so as to perform start-up torque distribution using the first final target torque and the second final target torque.

[0011] Optionally, in an embodiment of the present application, the distribution module comprises: a calculation unit configured to calculate an output demand torque of the motor based on the dynamic torque demand, the power generation torque demand and the actual torque; an acquisition unit configured to acquire a maximum discharging capacity of the motor in the low-temperature starting working condition based on the maximum limited discharging power; a first judgment unit configured to judge whether the motor meets a preset response condition based on the output demand torque and the maximum discharging capacity; and a distribution unit configured to calculate a corresponding engine compensation torque according to the output demand torque and the maximum discharging capacity in the case that the motor does not meet the preset response condition, and acquire the first final target torque based on the engine compensation torque and the second final target torque based on the maximum discharging capacity, or otherwise, acquire the first final target torque based on the first initial distribution target torque and the second final target torque based on the output demand torque.

[0012] Optionally, in an embodiment of the present application, the first judgment unit comprises: a calculation sub-unit configured to calculate a maximum output torque of the motor based on a preset ratio and the maximum discharging capacity; a judgment sub-unit configured to judge whether the output demand torque is greater than the maximum output torque; and a determination sub-unit configured to determine that the motor does not meet the preset response condition in the case that the output demand torque is greater than the maximum output torque.

[0013] Optionally, in an embodiment of the present application, further comprising: an adjustment module configured to adjust the output torque of the engine by using a preset torque economy zone, and perform driving torque distribution according to a preset driving torque distribution strategy in the case that the output torque falls within the preset torque economy zone.

[0014] Optionally, in an embodiment of the present application, further comprising: an acquisition unit configured to acquire a water temperature of the engine and an oil temperature of a transmission; a second judgment unit configured to judge whether the vehicle is in a cold state based on the water temperature and the oil temperature; and a determination unit configured to determine that the vehicle is in the low-temperature starting working condition after the vehicle receives a throttle trigger signal in the case that the vehicle is in the cold state.

[0015] A third aspect embodiment of the present application provides a vehicle, comprising: a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the starting torque distribution method of the hybrid vehicle as described in the above embodiments.

[0016] The fourth aspect of the embodiments of the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make the computer execute the starting torque distribution method of the hybrid vehicle as described in the above embodiments.

[0017] The fifth aspect of the embodiments of the present application provides a computer program product, which comprises a computer program, and the computer program is executed to implement the starting torque distribution method of the hybrid vehicle as described above.

[0018] The embodiments of the present application can be used in the case that the vehicle is in the low-temperature starting working condition, and the initial distribution of the engine torque and the motor torque of the vehicle is performed according to the current state parameters of the vehicle, to obtain the first initial distribution target torque of the engine and the second initial distribution target torque of the motor, and when the engine and the motor are controlled to improve the output torque according to the initial distribution, the power torque demand and the power generation torque demand of the vehicle are determined based on the current state parameters, and then the torque of the engine and the motor is redistributed by combining the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting working condition, that is, the first final target torque of the engine and the second final target torque of the motor are obtained, so that the starting torque distribution is performed by using the first final target torque and the second final target torque, to adapt to the low-temperature starting working condition, and the engine torque and the motor torque are adjusted according to the actual working condition, so that the motor is preferentially used for driving starting within the capability range of the motor, to improve the stability and smoothness of starting. Thus, the technical problem that in the related art, the hybrid vehicle of P2 configuration is difficult to ensure the control precision of the clutch combination process in the low-temperature environment during the starting process by using the starting clutch for control, the smoothness of the vehicle starting process is poor, and the driving experience of the user is affected, is solved.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A flowchart of a starting torque distribution method of a hybrid vehicle according to an embodiment of the present application is shown in FIG. 1;

[0022] Figure 2 A principle diagram of a starting torque distribution method of a hybrid vehicle according to an embodiment of the present application is shown in FIG. 2;

[0023] Figure 3 A diagram of a low-temperature starting working condition torque distribution principle according to an embodiment of the present application is shown in FIG. 3.

[0024] Figure 4 A flow chart of a method for distributing start-up torque of a hybrid vehicle according to an embodiment of the present application;

[0025] Figure 5 A performance result diagram of a low-temperature 20% throttle standing start according to an embodiment of the present application;

[0026] Figure 6 A structural diagram of a start-up torque distribution device of a hybrid vehicle according to an embodiment of the present application;

[0027] Figure 7 A structural diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below with reference to the attached drawings.

[0029] A starting torque distribution method, device, vehicle and medium of a hybrid vehicle are described below with reference to the accompanying drawings. In the related art mentioned in the background art, the P2 configuration hybrid vehicle uses a starting clutch for control during the starting process, which is difficult to ensure the control accuracy of the clutch engagement process in a low temperature environment, resulting in poor smoothness of the vehicle starting process and affecting the driving experience of the user. To solve the technical problem, the application provides a starting torque distribution method of a hybrid vehicle. In the method, the engine and motor torque of the vehicle can be preliminarily distributed according to the current state parameters of the vehicle when the vehicle is in a low temperature starting condition, to obtain a first initial distribution target torque of the engine and a second initial distribution target torque of the motor. When the engine and motor output torque is controlled according to the preliminary distribution, the power torque demand and the power generation torque demand of the vehicle are determined based on the current state parameters, and then the torque of the engine and the motor is redistributed by combining the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low temperature starting condition, i.e. the first final target torque of the engine and the second final target torque of the motor, so as to adapt to the low temperature starting condition and adjust the engine torque and the motor torque according to the actual working condition, so as to preferentially use the motor to drive the starting within the capacity range of the motor, thereby improving the stability and smoothness of the starting. Thus, the technical problem of the related art that the P2 configuration hybrid vehicle uses a starting clutch for control during the starting process, which is difficult to ensure the control accuracy of the clutch engagement process in a low temperature environment, resulting in poor smoothness of the vehicle starting process and affecting the driving experience of the user is solved.

[0030] Specifically, Figure 1 A flowchart of a starting torque distribution method of a hybrid vehicle provided by an embodiment of the application is shown.

[0031] As Figure 1 shown, the starting torque distribution method of the hybrid vehicle includes the following steps:

[0032] In step S101, when the vehicle is in a low temperature starting condition, the first initial distribution target torque of the engine and the second initial distribution target torque of the motor of the vehicle are determined based on the current state parameters of the vehicle.

[0033] It can be understood that the hybrid vehicle can combine two or more different power sources, such as an engine and a motor, and utilize the advantages of each power source, such as the continuous high power output capability of the internal combustion engine and the zero emission and low speed high torque characteristics of the electric motor, to select the most suitable power source or use both according to different driving conditions, so as to achieve the effect of energy saving and emission reduction.

[0034] In the hybrid vehicle, the motor can provide high torque at low speed, thereby facilitating smooth starting and acceleration, and facilitating the vehicle to run on urban roads where the driving state needs to be frequently changed; the engine can work at the lowest load and highest efficiency, and serve as additional power assistance to extend the driving range of the vehicle, etc.

[0035] For an automatic transmission with a starting clutch, such as a dual-clutch automatic transmission and a P2 configuration hybrid special transmission, there are mainly two control modes for the starting condition: one is torque control starting, that is, after the user steps on the accelerator, the power source outputs a fixed torque according to the set driving torque profile, and the transmission controls the combination oil pressure of the clutch in real time to monitor the speed rise during the starting process, thereby achieving smooth starting; the other is speed control starting, that is, after the user steps on the accelerator, the TCU sends a target speed, and controls the combination oil pressure according to the received torque signal, without additional control, the VCU or ECU controls the torque to ensure that the actual speed matches the target speed, thereby achieving smooth starting. In theory, speed control starting has more advantages than torque control starting due to the stability of clutch torque transmission. However, the speed control starting has a high requirement for the accuracy of the torque signal, otherwise, if the speed drops during the starting process, the starting effect will be affected.

[0036] However, under the low-temperature starting condition, the temperature limits the output of the motor, and at this time, the engine may need to provide power assistance, therefore, in order to ensure the smoothness of starting, the embodiment of the present application can first detect whether the vehicle is in a low-temperature starting condition, and when the vehicle is in a low-temperature starting condition, the initial torque distribution of the engine and the motor is performed.

[0037] In the hybrid driving state, the VCU needs to determine the demand for vehicle power according to the user's operation, determine and filter the torque signal for controlling the clutch combination oil pressure of the transmission based on the accelerator pedal profile. The VCU distributes the demand torque to the MCU and the ECU, which are respectively executed by the motor and the engine, and the core is the torque distribution of the HCU to the engine. When the vehicle is in a low-temperature cold state, the user steps on the accelerator from the idle state to the driving state, the HCU distributes the torque to the ECU, and the initial value of the engine actual torque at the driving time is used as the initial value, the initial distribution target torque is obtained by looking up the table according to the accelerator opening and the temperature signal, and the transition is performed from the initial value to the target value at a fixed rate. The setting principle of the initial distribution target torque is that the lower the temperature and the smaller the accelerator opening, the smaller the value distributed to the engine, so as to reduce the demand for engine torque in the starting condition and reduce the influence of the poor torque following property of the engine under low-temperature conditions and the low precision on the smoothness of starting.

[0038] Optionally, in one embodiment of the present application, before determining the first initial allocation target torque of the engine and the second initial allocation target torque of the motor based on the current state parameters of the vehicle, further comprising: obtaining the water temperature of the engine and the oil temperature of the transmission; determining whether the vehicle is in a cold state based on the water temperature and the oil temperature; if the vehicle is in a cold state, determining that the vehicle is in a low-temperature starting operating condition after the vehicle receives the throttle trigger signal.

[0039] Wherein, the HCU can determine whether the vehicle is in a cold state according to real-time engine water temperature, oil temperature and other information, when the vehicle is in a cold state, and the user steps on the accelerator from the idle state to the driving state, it is determined that the vehicle is in a low-temperature starting operating condition.

[0040] In step S102, the engine and the motor are controlled to increase the output torque based on the first initial allocation target torque and the second initial allocation target torque, respectively.

[0041] After obtaining the first initial allocation target torque and the second initial allocation target torque, the engine and the motor can be controlled to overshoot from the initial value to the target value at a certain rate.

[0042] In step S103, the power torque demand and the power generation torque demand of the vehicle are determined based on the current state parameters, and the first final target torque of the engine and the second final target torque of the motor are obtained according to the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting operating condition, so as to perform starting torque allocation by using the first final target torque and the second final target torque.

[0043] It can be understood that during the starting process of the vehicle, although the torque of the engine is overshooting from the initial value to the target value at a certain rate, the actual torque will deviate from the target value, therefore, when performing the second allocation, the actual torque of the engine needs to be considered in the embodiment of the present application.

[0044] As a possible implementation, the embodiment of the present application can determine the starting operating condition power torque demand and the real-time power generation demand based on user operation, for example, the depression amplitude of the user's accelerator pedal, the user's opened electrical equipment (such as air conditioner, etc.), and perform torque secondary allocation according to the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting operating condition, so as to ensure the starting stability and power performance in the low-temperature starting operating condition.

[0045] Optionally, in an embodiment of the present application, the first final target torque of the engine and the second final target torque of the motor are obtained according to the dynamic torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting condition, and the method comprises: calculating the output demand torque of the motor based on the dynamic torque demand, the power generation torque demand and the actual torque; obtaining the maximum discharge capacity of the motor in the low-temperature starting condition based on the maximum limited discharge power; judging whether the motor meets the preset response condition based on the output demand torque and the maximum discharge capacity; if the motor does not meet the preset response condition, calculating the corresponding engine compensation torque according to the output demand torque and the maximum discharge capacity, and obtaining the first final target torque based on the engine compensation torque and the second final target torque based on the maximum discharge capacity, otherwise, obtaining the first final target torque based on the first initial allocation target torque and the second final target torque based on the output demand torque.

[0046] Further, the embodiment of the present application can determine the starting condition dynamic torque demand and the real-time power generation demand according to the operation of the user, subtract the actual torque of the engine, and obtain the output demand torque of the motor.

[0047] The proportion of the maximum capacity of the motor needs to be determined according to the current maximum discharge power of the battery, and the discharge capacity of the battery at low temperature is greatly affected. The lower the discharge capacity is, the lower the above-mentioned proportion is. When the driving torque demand is large, the engine torque is started as soon as possible to ensure that the power response meets the user's expectation.

[0048] The embodiment of the present application can obtain the corresponding maximum discharge capacity according to the maximum limited discharge power of the motor in the low-temperature starting condition, so as to judge whether the maximum discharge capacity can support the output demand torque of the motor. When it cannot support, it is determined that the preset response condition is not met, so that the torque part that cannot be met by the motor, such as the torque exceeding a certain proportion of the maximum discharge capacity, is allocated to the engine again, and then the corresponding first final target torque and second final target torque are obtained.

[0049] Optionally, in an embodiment of the present application, judging whether the motor meets the preset response condition based on the output demand torque and the maximum discharge capacity comprises: calculating the maximum output torque of the motor based on the preset proportion and the maximum discharge capacity; judging whether the output demand torque is greater than the maximum output torque; if the output demand torque is greater than the maximum output torque, it is determined that the motor does not meet the preset response condition.

[0050] In actual execution, the maximum output torque is the maximum torque that the motor can output under the low-temperature starting condition. The maximum discharge capacity in a certain proportion can be used as the maximum output torque for determining whether the motor can output according to the output demand torque. When the output demand torque is greater than the maximum output torque, it is determined that the motor does not meet the preset response condition.

[0051] The preset proportion can be set by a person skilled in the art according to actual conditions, and is not specifically limited herein.

[0052] Optionally, in an embodiment of the application, after the starting torque distribution is performed by using the first final target torque and the second final target torque, the method further comprises: adjusting the output torque of the engine by using a preset torque economy zone, and performing driving torque distribution according to a preset driving torque distribution strategy when the output torque falls within the preset torque economy zone.

[0053] After the starting process ends, that is, after the transmission starting clutch is completely synchronized, in the embodiment of the application, the torque demand of the HCU distributed to the ECU is transitioned from the current value to a certain torque economy zone, such as the best economy zone, to improve the fuel economy during driving.

[0054] The preset torque economy zone can be set by a person skilled in the art according to actual conditions, and is not specifically limited herein.

[0055] In combination with Figures 2 to 5 FIG. 1 shows the working principle of the starting torque distribution method of the hybrid vehicle in an embodiment of the application.

[0056] The working principle of the embodiment of the application can be as shown in Figure 2 The low-temperature starting condition torque distribution principle can be as shown in Figure 3 The VCU torque control process can be as shown in Figure 4

[0057] In the hybrid driving state, the VCU needs to determine the demand for vehicle power performance according to the user's operation, determine and perform driving filtering based on the accelerator pedal map, and output a torque signal for controlling the clutch engagement oil pressure of the transmission.

[0058] Step S401: The VCU determines that the vehicle is in a cold state based on the engine coolant temperature and the transmission oil temperature detected by the sensor.

[0059] Step S402: The VCU outputs a first initial distribution target torque and a second initial distribution target torque according to the starting torque distribution principle based on the vehicle component state and the user operation.

[0060] ​VCU allocates the demand torque to the MCU and ECU, which is executed by the motor and engine respectively. The core is the torque allocation module of HCU to the engine. When the vehicle is in the low-temperature cold state, the user steps on the accelerator from the idle state to the driving state, and the HCU allocates the torque to the ECU. The actual torque of the engine at the driving time is taken as the initial value. The initial allocation target torque is obtained by looking up the table according to the accelerator opening degree and temperature signal, that is, the first initial allocation target torque of the engine and the second initial allocation target torque of the motor. The initial allocation target torque is transitioned from the initial value to the target value at a fixed rate. The setting principle of the initial allocation target torque is that the lower the temperature and the smaller the accelerator opening degree, the smaller the value allocated to the engine. The demand for engine torque is reduced as much as possible in the starting condition, and the poor torque followability and low precision of the engine in the low-temperature working condition affect the starting smoothness.

[0061] Step S403: Based on the capability of the electric drive system, the VCU outputs the first final target torque and the second final target torque.

[0062] The embodiment of the present application can determine the starting condition power torque demand and the real-time power generation demand based on the user operation, subtract the real-time actual torque value of the engine, and obtain the output torque required by the motor. When the demand torque of the motor exceeds a certain proportion of the maximum capability of the current motor, the torque demand is allocated to the engine again to respond, that is, the first final target torque of the engine and the second final target torque of the motor are obtained.

[0063] The proportion of the maximum capability of the motor needs to be determined according to the current maximum discharge power of the battery. The discharge capability of the battery at low temperature is greatly affected. The lower the discharge capability, the lower the above-mentioned proportion. When the driving torque demand is large, the engine torque is used as soon as possible to ensure that the power response meets the user's expectation.

[0064] Step S404: After the starting is completed, the engine and motor control torque is transitioned to the conventional allocation method.

[0065] After the starting process is completed, the transmission starting clutch is completely synchronized, and then the torque demand allocated to the ECU by the HCU is transitioned from the current value to the optimal economic zone operation, so as to improve the fuel economy in driving.

[0066] In summary, the HCU first identifies that the current vehicle is in the cold state through the signals such as the engine coolant temperature and the transmission oil temperature measured by the sensor. When the user steps on the accelerator to enter the driving condition after shifting the gear, the engine target torque and the motor target torque are preliminarily allocated according to the vehicle part state and the user operation. Then, the output torque of the motor is limited according to the current torque capability of the electric drive system, and finally the final torque demand of the engine and the motor is obtained. After the starting is completed, the engine torque is transitioned to the optimal economic zone, and the conventional torque control and allocation method is entered.

[0067] Furthermore, such as Figure 5 As shown, taking a 20% throttle start under low-temperature conditions as an example, when the user presses the accelerator, the TCU sends the target starting speed, and the VCU outputs the driver's required torque. As the torque operated by the user increases, the engine's required torque remains at a low and stable value, while the motor's target torque increases, achieving stable torque output. The engine speed and the target speed sent by the TCU are well matched, ensuring a smooth start. After the start-up condition is completed, it can be seen from the torque control mode switching indicator that the engine torque demand and the motor's target torque begin to change, transitioning to a conventional torque distribution mode to achieve good engine fuel economy.

[0068] The starting torque distribution method for hybrid electric vehicles proposed in this application can initially distribute the engine and motor torques based on the vehicle's current state parameters when the vehicle is in a low-temperature starting condition. This yields a first initial target torque for the engine and a second initial target torque for the motor. While controlling the engine and motor to increase output torque according to the initial distribution, the vehicle's power torque demand and generator torque demand are determined based on the current state parameters. Then, combining the power torque demand, generator torque demand, the actual engine torque, and the maximum limited discharge power of the motor under low-temperature starting conditions, the engine and motor torques are redistributed to obtain a first final target torque for the engine and a second final target torque for the motor. This first and second final target torques are then used for starting torque distribution to adapt to low-temperature starting conditions. The engine torque and motor torque are adjusted according to the actual conditions, prioritizing motor-driven starting within the motor's capacity, thus improving starting stability and smoothness. This solves the technical problem in related technologies where P2 configuration hybrid vehicles use a starting clutch for control during starting, making it difficult to maintain the control accuracy of the clutch engagement process in low-temperature environments, resulting in poor smoothness during vehicle starting and affecting the user's driving experience.

[0069] Next, referring to the accompanying drawings, a start-up torque distribution device for a hybrid electric vehicle according to an embodiment of this application is described.

[0070] Figure 6 This is a block diagram of a start-up torque distribution device for a hybrid electric vehicle according to an embodiment of this application.

[0071] like Figure 6 As shown, the starting torque distribution device 10 of the hybrid vehicle includes: a determination module 100, a control module 200, and a distribution module 300.

[0072] Specifically, the determining module 100 is configured to determine a first initial allocation target torque of an engine and a second initial allocation target torque of an electric motor of the vehicle based on current state parameters of the vehicle when the vehicle is in a low-temperature starting condition.

[0073] The control module 200 is configured to control the engine and the electric motor to output torque based on the first initial allocation target torque and the second initial allocation target torque respectively.

[0074] The allocation module 300 is configured to determine a power torque demand and a power generation torque demand of the vehicle based on the current state parameters, and obtain a first final target torque of the engine and a second final target torque of the electric motor according to the power torque demand, the power generation torque demand, an actual torque of the engine and a maximum discharge power of the electric motor in the low-temperature starting condition, so as to allocate starting torque by using the first final target torque and the second final target torque.

[0075] Optionally, in an embodiment of the present application, the allocation module 300 comprises a calculation unit, an acquisition unit, a first judgment unit and an allocation unit.

[0076] The calculation unit is configured to calculate an output demand torque of the electric motor based on the power torque demand, the power generation torque demand and the actual torque.

[0077] The acquisition unit is configured to obtain a maximum discharge capacity of the electric motor in the low-temperature starting condition based on the maximum discharge power.

[0078] The first judgment unit is configured to judge whether the electric motor meets a preset response condition based on the output demand torque and the maximum discharge capacity.

[0079] The allocation unit is configured to calculate a corresponding engine compensation torque according to the output demand torque and the maximum discharge capacity when the electric motor does not meet the preset response condition, and obtain the first final target torque based on the engine compensation torque and obtain the second final target torque based on the maximum discharge capacity, or obtain the first final target torque based on the first initial allocation target torque and obtain the second final target torque based on the output demand torque.

[0080] Optionally, in an embodiment of the present application, the first judgment unit comprises a calculation subunit, a judgment subunit and a determination subunit.

[0081] The calculation subunit is configured to calculate a maximum output torque of the electric motor based on a preset proportion and the maximum discharge capacity.

[0082] The judgment subunit is configured to judge whether the output demand torque is greater than the maximum output torque.

[0083] The determining subunit is configured to determine that the motor does not meet the preset response condition when the output demand torque is greater than the maximum output torque.

[0084] Optionally, in an embodiment of the present application, the starting torque distribution device 10 of the hybrid vehicle further comprises an adjusting module.

[0085] The adjusting module is configured to adjust the output torque of the engine by using the preset torque economy zone, and perform the driving torque distribution according to the preset driving torque distribution strategy when the output torque falls within the preset torque economy zone.

[0086] Optionally, in an embodiment of the present application, the starting torque distribution device 10 of the hybrid vehicle further comprises an obtaining unit, a second judging unit and a determining unit.

[0087] The obtaining unit is configured to obtain the water temperature of the engine and the oil temperature of the transmission.

[0088] The second judging unit is configured to judge whether the vehicle is in a cold state based on the water temperature and the oil temperature.

[0089] The determining unit is configured to determine that the vehicle is in a low-temperature starting working condition when the vehicle receives the accelerator trigger signal when the vehicle is in the cold state.

[0090] It should be noted that the foregoing description of the embodiment of the starting torque distribution method of the hybrid vehicle is also applicable to the starting torque distribution device of the hybrid vehicle of the embodiment, which will not be described herein again.

[0091] The starting torque distribution device of the hybrid vehicle provided by the embodiment of the present application can preliminarily distribute the engine torque and the motor torque of the vehicle according to the current state parameters of the vehicle when the vehicle is in the low-temperature starting working condition, obtain the first initial distribution target torque of the engine and the second initial distribution target torque of the motor, and determine the power torque demand and the power generation torque demand of the vehicle based on the current state parameters when the engine and the motor are controlled to improve the output torque according to the preliminary distribution, and then combine the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting working condition to perform torque redistribution of the engine and the motor, that is, to obtain the first final target torque of the engine and the second final target torque of the motor, so as to perform starting torque distribution by using the first final target torque and the second final target torque, so as to adapt to the low-temperature starting working condition and adjust the engine torque and the motor torque according to the actual working condition, so as to preferentially use the motor to drive starting within the capability range of the motor, improve the stability and smoothness of starting. Thus, the technical problem that the P2 configuration hybrid vehicle in the related art is difficult to ensure the control precision of the clutch combination process in the low-temperature environment by using the starting clutch to control in the starting process, the smoothness of the vehicle starting process is poor, and the user's driving experience is affected is solved.

[0092] Figure 7 The vehicle structure schematic diagram provided by the embodiment of the present application. The vehicle can include:

[0093] The memory 701, the processor 702 and the computer program stored in the memory 701 and executable on the processor 702.

[0094] The processor 702 implements the starting torque distribution method of the hybrid vehicle provided in the above embodiment when executing the program.

[0095] Further, the vehicle further includes:

[0096] The communication interface 703 is used for communication between the memory 701 and the processor 702.

[0097] The memory 701 is used to store the computer program executable on the processor 702.

[0098] The memory 701 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0099] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected with each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 7 Only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus.

[0100] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can complete communication between each other through an internal interface.

[0101] The processor 702 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0102] The embodiment further provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the starting torque distribution method of the hybrid vehicle as above.

[0103] The embodiment of the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the starting torque distribution method of the hybrid vehicle provided by the embodiment of the present application.

[0104] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0105] Furthermore, the terms "first", "second", or the like, are used only to describe the different features and do not imply or suggest relative importance of, or a number of, the indicated technical features. Thus, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the application, "N" means at least two, for example, two, three, etc., unless explicitly specified otherwise.

[0106] Any process or method descriptions or descriptions of the flow diagrams in the present application can be understood as representing code modules, segments, or portions of code which include one or more executable instructions for performing specific logic functions or steps in the process, and that the various systems described herein can include one or more circuits, or other means for performing the functions described in conjunction with the different aspects. In some embodiments, the various systems described herein can include, without limitation, hardware, software, and / or embedded logic such as a combination of logic gates in an application specific integrated circuit, or other implementation to carry out the functionality described in conjunction therewith. Furthermore, it should be understood that the functions described herein can be carried out by one or more aspects of the application without necessarily being carried out by a different aspect of the application.

[0107] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, a processor-based system, or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or a combination of them. For the purposes of this specification, a "computer readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus or device. The computer readable medium can be a computer readable storage medium or a computer readable signal medium. The computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a propagation medium. The computer readable signal medium can include, but is not limited to, a computer readable medium that facilitates transfer of the program from one place to another. A specific example of a computer readable medium is a non-transitory computer-readable storage medium. A specific example of a computer readable signal medium is a source or destination of the computer readable medium. Another specific example of a computer readable signal medium is a computer readable signal travelling through space. Thus, a computer readable medium can take many forms of hardware to carry out the program for use by or in connection with the instruction execution system, apparatus or device.

[0108] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0109] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium. When the programs are executed, one or a combination of the steps of the method embodiments is included.

[0110] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0111] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method of distributing launch torque in a hybrid vehicle, characterized by, The method comprises the following steps: In the case that the vehicle is in a low-temperature starting working condition, determining a first initial allocation target torque of an engine and a second initial allocation target torque of a motor of the vehicle based on current state parameters of the vehicle; Controlling the engine and the motor to increase output torque based on the first initial allocation target torque and the second initial allocation target torque respectively; Determining power torque demand and power generation torque demand of the vehicle based on the current state parameters, and obtaining a first final target torque of the engine and a second final target torque of the motor according to the power torque demand, the power generation torque demand, an actual torque of the engine and a maximum limited discharge power of the motor in the low-temperature starting working condition, so as to perform starting torque allocation by using the first final target torque and the second final target torque. The first initial allocation target torque and the second initial allocation target torque are obtained by looking up a table according to a throttle opening degree and a temperature signal of the vehicle, and the setting principle of the first initial allocation target torque is that the lower the temperature and the smaller the throttle opening degree, the smaller the value allocated to the engine.

2. The method of claim 1, wherein, The first final target torque of the engine and the second final target torque of the motor are obtained according to the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting working condition, and the method comprises the following steps: Calculating an output demand torque of the motor based on the power torque demand, the power generation torque demand and the actual torque; Obtaining a maximum discharge capacity of the motor in the low-temperature starting working condition based on the maximum limited discharge power; Judging whether the motor meets a preset response condition based on the output demand torque and the maximum discharge capacity; If the motor does not meet the preset response condition, calculating a corresponding engine compensation torque according to the output demand torque and the maximum discharge capacity, obtaining the first final target torque based on the engine compensation torque, and obtaining the second final target torque based on the maximum discharge capacity, otherwise, obtaining the first final target torque based on the first initial allocation target torque, and obtaining the second final target torque based on the output demand torque.

3. The method of claim 2, wherein, The judgment of whether the motor meets the preset response condition based on the output demand torque and the maximum discharge capacity comprises the following steps: Calculating a maximum output torque of the motor based on a preset ratio and the maximum discharge capacity; Judging whether the output demand torque is greater than the maximum output torque; If the output demand torque is greater than the maximum output torque, it is determined that the motor does not meet the preset response condition.

4. The method of claim 1, wherein, After the starting torque allocation by using the first final target torque and the second final target torque, the method further comprises the following steps: Adjusting the output torque of the engine by using a preset torque economy zone, and performing driving torque allocation according to a preset driving torque allocation strategy in the case that the output torque falls within the preset torque economy zone.

5. The method of claim 1, wherein, Before determining the first initial distribution target torque of the engine and the second initial distribution target torque of the motor of the vehicle based on the current state parameters of the vehicle, further comprising: obtaining the water temperature of the engine and the oil temperature of the transmission; determining whether the vehicle is in a cold state based on the water temperature and the oil temperature; if the vehicle is in the cold state, determining that the vehicle is in the low-temperature starting working condition after the vehicle receives an accelerator trigger signal.

6. A starting torque distribution device for a hybrid electric vehicle, characterized in that, comprising: determining module, configured to determine the first initial distribution target torque of the engine and the second initial distribution target torque of the motor of the vehicle based on the current state parameters of the vehicle in the case that the vehicle is in the low-temperature starting working condition; wherein the first initial distribution target torque and the second initial distribution target torque are obtained by looking up a table with the accelerator opening degree and the temperature signal of the vehicle, wherein the setting principle of the first initial distribution target torque is that the lower the temperature and the smaller the accelerator opening degree, the smaller the value distributed to the engine; control module, configured to control the engine and the motor to increase the output torque based on the first initial distribution target torque and the second initial distribution target torque respectively; distribution module, configured to determine the power torque demand and the power generation torque demand of the vehicle based on the current state parameters, and obtain the first final target torque of the engine and the second final target torque of the motor according to the power torque demand, the power generation torque demand, the actual torque of the engine and the maximum limited discharge power of the motor in the low-temperature starting working condition, so as to perform starting torque distribution by using the first final target torque and the second final target torque.

7. The apparatus of claim 6, wherein, The distribution module comprises: a calculation unit, configured to calculate the output demand torque of the motor based on the power torque demand, the power generation torque demand and the actual torque; an obtaining unit, configured to obtain the maximum discharge capacity of the motor in the low-temperature starting working condition based on the maximum limited discharge power; a judgment unit, configured to judge whether the motor meets a preset response condition based on the output demand torque and the maximum discharge capacity; a distribution unit, configured to calculate a corresponding engine compensation torque according to the output demand torque and the maximum discharge capacity in the case that the motor does not meet the preset response condition, and obtain the first final target torque based on the engine compensation torque and the second final target torque based on the maximum discharge capacity, or otherwise, obtain the first final target torque based on the first initial distribution target torque and the second final target torque based on the output demand torque.

8. The apparatus of claim 7, wherein, The judgment unit comprises: a calculation sub-unit, configured to calculate the maximum output torque of the motor based on a preset ratio and the maximum discharge capacity; a judgment sub-unit, configured to judge whether the output demand torque is greater than the maximum output torque; a determination sub-unit, configured to determine that the motor does not meet the preset response condition in the case that the output demand torque is greater than the maximum output torque.

9. A vehicle characterized by comprising: comprising: A memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of claim 1-5.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor for implementing the method of claim 1-5.

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