Transmission control system based on series-parallel hybrid power driving device

Abstract

The invention discloses a transmission control system based on a series-parallel hybrid power driving device in the technical field of hybrid electric vehicles. The transmission control system comprises a vehicle information acquisition module, a vehicle-mounted control panel and a hybrid power execution module. The hybrid power execution module comprises an internal combustion engine, a motor, a clutch, a first planetary gear train and a second planetary gear train; the vehicle information acquisition module is used for acquiring rotating speed information of an output shaft of a vehicle in real time and sending the rotating speed information of the output shaft to the control panel; the control panel is based on standard rotating speed information corresponding to the gear shifting instruction of the clutch at the current time; the control panel compares the rotating speed information of the output shaft at the current time with the rotating speed information of the standard cone, judges the current motion state of the vehicle, and adjusts the power output at the current time based on the motion state of the vehicle, so that the power output of the motor and the internal combustion engine can be adjusted according to different conditions of the current road; the power performance and the economic performance of the vehicle are improved.

Description

Technical Field

[0001] This invention belongs to the field of hybrid vehicle technology, specifically a transmission control system based on a series-parallel hybrid drive device. Background Technology

[0002] With the development of the modern automobile industry, people's awareness of environmental protection has been increasing, and fossil resources are gradually becoming scarce. Therefore, traditional internal combustion engine vehicles are gradually developing into hybrid electric vehicles.

[0003] Hybrid electric vehicles (HEVs) are based on traditional powertrain systems, using the coupling of an electric motor and an internal combustion engine to achieve optimal fuel economy while meeting power requirements. However, when HEVs are driven on complex roads, such as uphill, downhill, and bumpy roads, effective control of the power regulation of the electric motor and internal combustion engine is a crucial prerequisite for improving the vehicle's power and fuel economy. Summary of the Invention

[0004] The purpose of this invention is to provide a transmission control system based on a series-parallel hybrid drive device, which can adjust the power output of the electric motor and the internal combustion engine according to different road conditions, thereby improving the vehicle's power performance and economic performance.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A transmission control system based on a series-parallel hybrid drive unit includes a vehicle information acquisition module, an on-board control panel, and a hybrid power execution module;

[0007] The hybrid power execution module includes an internal combustion engine, an electric motor, a clutch, a first planetary gear system, and a second planetary gear system.

[0008] The internal combustion engine is fixedly connected to the first sun gear of the first planetary gear system, and the electric motor is fixedly connected to the first planet carrier of the first planetary gear system.

[0009] A generator is also connected to the output end of the first and second planetary gear trains.

[0010] One end of the clutch is connected to the first planetary gear system, and the other end of the clutch is connected to the second planetary gear system;

[0011] The clutch also includes a first brake and a second brake, the first brake being connected to the output end of the first planetary gear system, and the second brake being connected to the output end of the second planetary gear system.

[0012] The vehicle information acquisition module is used to collect the output shaft speed information of the vehicle in real time and send the output shaft speed information to the control panel;

[0013] The control panel receives the clutch shift command based on the current time and converts the shift command into the corresponding standard cone speed information. The control panel then compares the current output shaft speed information with the standard cone speed information. If the current output shaft speed information matches the standard cone speed information, a power generation judgment command is sent to the control panel. If the current output shaft speed information does not match the standard cone speed information, a control command is sent to the control panel.

[0014] The control panel determines whether the shift command at the current time is a downshift command based on the power generation judgment command. If the shift command is a downshift command, a start command is sent to the generator; if the shift command is not a downshift command, the process is terminated.

[0015] The control panel then obtains the rate of change of the output shaft speed information for the current time interval based on the control command, obtains the maximum value, minimum value and number of changes based on the rate of change, obtains the standard cone value based on the standard cone speed information and uses the standard cone value as the baseline, and outputs the vehicle motion state corresponding to the current time interval to the control panel based on the distribution of the maximum and minimum values ​​near the baseline, and adjusts the power output for the current time based on the vehicle motion state.

[0016] The above solution achieved the following beneficial effects:

[0017] During vehicle operation, the driver controls the clutch to adjust the output shaft speed of the hybrid powertrain module at the current time.

[0018] The control panel confirms the vehicle's output shaft speed information through the vehicle information acquisition module, judges the difference between the vehicle's real-time driving speed and the standard shaft speed information, and thus confirms the current road conditions. Based on different road conditions, it adjusts the power output of the internal combustion engine or electric motor. At the same time, when performing downshifting, the generator works to recover energy during braking, so as to achieve energy saving and emission reduction. It can adjust the power output of the electric motor and internal combustion engine according to different road conditions, thereby improving the vehicle's power performance and economic performance.

[0019] Furthermore, the first planetary gear system includes a first sun gear, a first planet carrier, and a first ring gear. A plurality of first planetary gears are rotatably fitted on the first planet carrier, and the first ring gear is connected to the first brake and the electric motor.

[0020] The second planetary gear system includes a second sun gear, a second planet carrier, and a second ring gear. Several second planet gears are rotatably fitted on the second planet carrier. The second sun gear is connected to the second brake and the electric motor, and the second ring gear is fixed relative to the vehicle body.

[0021] One end of the clutch is connected to the first sun gear and the first ring gear of the first planetary gear system, and the other end of the clutch is connected to the second sun gear and the second ring gear of the second planetary gear system.

[0022] Beneficial effects: The clutch corresponding to the first gear ring and the second sun gear is in the intermediate gear position. It is connected to the first gear ring through the first brake and the electric motor, and to the second sun gear through the second brake and the electric motor. This facilitates timely braking of the vehicle's operation. At the same time, it allows the electric motor to utilize the energy of the braking process of the first and second brakes, thus achieving the purpose of energy saving and emission reduction.

[0023] Furthermore, the number of changes is obtained with reference to whether the output shaft speed information at the current time is greater than or less than the benchmark value.

[0024] Beneficial effect: By using the output shaft speed information as a reference to determine whether it is greater or less than the standard value, it is easier to confirm the fluctuation of the current time.

[0025] Furthermore, the vehicle's motion states include uphill, downhill, and flat road bumps. When the vehicle's motion state is uphill, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows a decreasing trend, with the number of changes being less than the set rated number.

[0026] When the vehicle is moving downhill, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows an increasing trend, while the number of changes is less than the set rated number.

[0027] When the vehicle is in a flat, bumpy road condition, the difference between the maximum and minimum values ​​of the rate of change is less than the set comparison value, and the curve of the rate of change fluctuates around the baseline of the cone line, with the number of changes exceeding the set rated number.

[0028] Beneficial effects: By subdividing the characteristics of the rate of change of vehicle motion state, the control panel can distinguish the vehicle motion state in a timely manner based on the output shaft speed information during vehicle operation, thereby adjusting the power output of the electric motor and internal combustion engine.

[0029] Furthermore, the output shaft speed information also includes left wheel speed information and right wheel speed information. The control panel is also used to calculate the difference between the left wheel speed information and the right wheel speed information, and compare the difference with the rotational difference. If the difference is greater than the rotational difference, the power output at the current time is adjusted based on the magnitude of the difference between the left wheel speed information and the right wheel speed information; if the difference is less than the rotational difference, the process is terminated.

[0030] Beneficial effects: By calculating the difference between the left wheel speed information and the right wheel speed information, it is easier to determine whether the vehicle is decelerating and turning at the current time, thereby facilitating the adjustment of the power output of the electric motor and the internal combustion engine to improve the vehicle's power performance and economic performance.

[0031] Furthermore, the power output is adjusted based on the standard spindle speed information corresponding to the clutch shift command at the current time. Then, the phase difference ratio between the output shaft speed information at the current time and the standard spindle speed information is calculated. The control panel adjusts the power output of the internal combustion engine and the electric motor based on the phase difference ratio.

[0032] Beneficial effects: The control panel adjusts the power output of the internal combustion engine and electric motor based on the phase difference ratio. The larger the phase difference ratio, the greater the power output of the internal combustion engine and electric motor compared to the standard power output, thus meeting the power output requirements under different conditions.

[0033] Furthermore, when the control panel sends a start command to the generator, it also determines whether the current vehicle movement is downhill. If the current vehicle movement is downhill, the control panel sends a start command to the generator; if the current vehicle movement is not downhill, the process terminates.

[0034] Beneficial effects: When the vehicle is moving downhill, the braking process is continuous, and the generator can recover and utilize the excess energy during braking. However, when the vehicle is moving uphill or on a bumpy road, the braking process is often intermittent, and the repeated starting of the generator will cause great damage and reduce the service life of the generator.

[0035] Furthermore, when the control panel compares the output shaft speed information at the current time with the standard shaft speed information, the output shaft speed information at the current time uses the output shaft speed information when the speed is stable as the comparison information.

[0036] Beneficial effects: Since the execution of the shift command requires a certain reaction time, by using the output shaft speed information when the speed is stable as the comparison information, the influence of the error in the output shaft speed information during acceleration or deceleration can be reduced. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the transmission control system based on a hybrid power drive device according to an embodiment of the present invention.

[0038] Figure 2 This is a circuit connection diagram of the transmission control system based on a hybrid power drive device according to an embodiment of the present invention. Detailed Implementation

[0039] The following detailed description illustrates the specific implementation method:

[0040] The reference numerals in the accompanying drawings include: internal combustion engine 1, electric motor 2, generator 3, clutch 4, first brake 41, second brake 42, first sun gear 51, first planetary carrier 52, first ring gear 53, second sun gear 61, second planetary carrier 62, second ring gear 63, and output shaft 7.

[0041] Example 1

[0042] The basic implementation examples are as follows: Figures 1 to 2 As shown: A transmission control system based on a series-parallel hybrid drive system includes a vehicle information acquisition module, an on-board control panel, and a hybrid power execution module;

[0043] The hybrid power execution module includes an internal combustion engine 1, an electric motor 2, a clutch 4, a first planetary gear system, and a second planetary gear system;

[0044] The first planetary gear system includes a first sun gear 51, a first planet carrier 52 and a first ring gear 53, and a plurality of first planetary gears are rotatably fitted on the first planet carrier 52;

[0045] The second planetary gear system includes a second sun gear 61, a second planet carrier 62, and a second ring gear 63. Several second planetary gears are rotatably fitted on the second planet carrier 62, and the second ring gear 63 is fixed relative to the vehicle body.

[0046] One end of the clutch 4 is connected to the first sun gear 51 and the first ring gear 53 of the first planetary gear system, and the other end of the clutch 4 is connected to the second sun gear 61 and the second ring gear 63 of the second planetary gear system.

[0047] The internal combustion engine 1 is fixedly connected to the first sun gear 51 of the first planetary gear system, and the electric motor 2 is fixedly connected to the first planet carrier 52 of the first planetary gear system.

[0048] The first ring gear 53 of the first planetary gear system and the second sun gear 61 of the second planetary gear system are also connected to the generator 3.

[0049] The clutch 4 also includes a first brake 41 and a second brake 42. The first brake 41 is connected to the first ring gear 53 of the first planetary gear system, and the second brake 42 is connected to the second sun gear 61 of the second planetary gear system.

[0050] For example, during vehicle operation, the driver controls the clutch 4 to adjust the speed of the output shaft 7 of the hybrid power execution module at the current time.

[0051] When the vehicle is in first gear, the electric motor 2 inputs power through the first ring gear 53 and outputs power through the output shaft 7; when the vehicle is in second gear, the internal combustion engine 1 drives the first sun gear 51 and the second sun gear 61 to input power and output power through the output shaft 7; when the vehicle is in third gear, the internal combustion engine 1 inputs power through the first planetary gear system and outputs power through the output shaft 7; when the vehicle is in reverse gear, power is input through the second ring gear 63 that switches directions and outputs power through the output shaft 7.

[0052] The vehicle information acquisition module is used to collect the output shaft 7 speed information of the vehicle in real time and send the output shaft 7 speed information to the control panel;

[0053] The control panel converts the shift command of clutch 4 at the current time into corresponding standard cone speed information. The control panel then compares the output shaft 7 speed information at the current time with the standard cone speed information, using the output shaft 7 speed information at a stable speed as the comparison information. If the output shaft 7 speed information at the current time matches the standard cone speed information, a power generation judgment command is sent to the control panel. If the output shaft 7 speed information at the current time does not match the standard cone speed information, a control command is sent to the control panel.

[0054] The control panel determines whether the shift command at the current time is a downshift command based on the power generation judgment command. If the shift command is a downshift command, the control panel also determines whether the current vehicle movement state is downhill. If the current vehicle movement state is downhill, the control panel sends a start command to the generator 3. If the current vehicle movement state is not downhill, the process terminates. If the shift command is not a downshift command, the process terminates.

[0055] The control panel then obtains the rate of change of the output shaft 7 speed information at the current time interval based on the control command. Based on the rate of change, it obtains the maximum value, minimum value, and number of changes. The number of changes is obtained with reference to whether the output shaft 7 speed information at the current time is greater than or less than the standard cone value. Based on the standard cone speed information, it obtains the standard cone value and uses the standard cone value as the baseline. Based on the distribution of the maximum and minimum values ​​near the baseline, it outputs the vehicle motion state corresponding to the current time interval to the control panel. Based on the vehicle motion state, it adjusts the power output at the current time. The method of adjusting the power output is based on the standard cone speed information corresponding to the shift command of the clutch 4 at the current time. Then, it calculates the ratio of the difference between the output shaft 7 speed information at the current time and the standard cone speed information. The control panel adjusts the power output of the internal combustion engine 1 and the electric motor 2 based on the ratio of the difference.

[0056] Among them, the vehicle movement states include uphill, downhill, flat road bumps, and when the vehicle movement state is uphill, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows a decreasing trend, and the number of changes is less than the set rated number.

[0057] When the vehicle is moving downhill, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows an increasing trend, while the number of changes is less than the set rated number.

[0058] When the vehicle is in a flat, bumpy road condition, the difference between the maximum and minimum values ​​of the rate of change is less than the set comparison value, and the curve of the rate of change fluctuates around the baseline of the cone line, with the number of changes exceeding the set rated number.

[0059] For example, when going uphill, the vehicle requires a large amount of power but operates at a low speed. Compared to normal driving, it is not suitable for generator 3 to perform regenerative braking and power generation. Instead, the power of electric motor 2 and internal combustion engine 1 needs to be increased. When going downhill, the braking process is continuous. Starting generator 3 can recover and utilize the excess energy during braking and also facilitates auxiliary braking of the vehicle. However, when the vehicle is moving uphill or bumpy, the braking process is often intermittent. Repeated starting of generator 3 will cause significant damage and reduce its service life.

[0060] The control panel confirms the output shaft speed information of the vehicle through the vehicle information acquisition module, judges the difference between the real-time driving process and the standard shaft speed information, and thus confirms the current road conditions. Based on the different road conditions, it adjusts the power output of the internal combustion engine 1 or the electric motor 2. At the same time, when performing downshifting, the generator 3 works to recover energy during the braking process to achieve energy saving and emission reduction. It can adjust the power output of the electric motor 2 and the internal combustion engine 1 according to different road conditions, thereby improving the vehicle's power performance and economic performance.

[0061] Example 2

[0062] The difference from the above embodiment is that the output shaft 7 speed information also includes left wheel speed information and right wheel speed information. The control panel is also used to calculate the difference between the left wheel speed information and the right wheel speed information, and compare the difference with the rotation difference. If the difference is greater than the rotation difference, the power output at the current time is adjusted based on the magnitude of the difference between the left wheel speed information and the right wheel speed information; if the difference is less than the rotation difference, the process is terminated.

[0063] The specific implementation process is as follows: By calculating the difference between the left wheel speed information and the right wheel speed information, it is easy to determine whether the vehicle is decelerating and turning at the current time, so as to adjust the power output of the electric motor 2 and the internal combustion engine 1 to improve the vehicle's power performance and economic performance.

[0064] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific structures and / or characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A transmission control system based on a series-parallel hybrid power drive unit, characterized in that: This includes a vehicle information collection module, an in-vehicle control panel, and a hybrid powertrain execution module; The hybrid power execution module includes an internal combustion engine, an electric motor, a clutch, a first planetary gear system, and a second planetary gear system. The internal combustion engine is fixedly connected to the first sun gear of the first planetary gear system, and the electric motor is fixedly connected to the first planet carrier of the first planetary gear system. A generator is also connected to the output end of the first and second planetary gear trains. One end of the clutch is connected to the first planetary gear system, and the other end of the clutch is connected to the second planetary gear system; The clutch also includes a first brake and a second brake, the first brake being connected to the output end of the first planetary gear system, and the second brake being connected to the output end of the second planetary gear system. The vehicle information acquisition module is used to collect the output shaft speed information of the vehicle in real time and send the output shaft speed information to the control panel; The control panel receives the clutch shift command based on the current time and converts the shift command into the corresponding standard cone speed information. The control panel then compares the current output shaft speed information with the standard cone speed information. If the current output shaft speed information matches the standard cone speed information, a power generation judgment command is sent to the control panel. If the current output shaft speed information does not match the standard cone speed information, a control command is sent to the control panel. The control panel determines whether the shift command at the current time is a downshift command based on the power generation judgment command. If the shift command is a downshift command, a start command is sent to the generator; if the shift command is not a downshift command, the process is terminated. The control panel then obtains the rate of change of the output shaft speed information for the current time interval based on the control command, obtains the maximum value, minimum value and number of changes based on the rate of change, obtains the standard cone value based on the standard cone speed information and uses the standard cone value as the baseline, and outputs the vehicle motion state corresponding to the current time interval to the control panel based on the distribution of the maximum and minimum values ​​near the baseline, and adjusts the power output for the current time based on the vehicle motion state.

2. The transmission control system based on a hybrid power drive device according to claim 1, characterized in that: The first planetary gear system includes a first sun gear, a first planet carrier, and a first ring gear. A plurality of first planet gears are rotatably fitted on the first planet carrier, and the first ring gear is connected to the first brake and the electric motor. The second planetary gear system includes a second sun gear, a second planet carrier, and a second ring gear. Several second planet gears are rotatably fitted on the second planet carrier. The second sun gear is connected to the second brake and the electric motor, and the second ring gear is fixed relative to the vehicle body. One end of the clutch is connected to the first sun gear and the first ring gear of the first planetary gear system, and the other end of the clutch is connected to the second sun gear and the second ring gear of the second planetary gear system.

3. The transmission control system based on a series-parallel hybrid drive unit according to claim 1, characterized in that: The number of changes is obtained by taking into account whether the output shaft speed information at the current time is greater than or less than the standard value.

4. The transmission control system based on a series-parallel hybrid drive unit according to any one of claims 1 or 3, characterized in that: The vehicle's motion states include uphill, downhill, flat road, and bumpy road. When the vehicle is in an uphill motion state, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows a decreasing trend, with the number of changes being less than the set rated number. When the vehicle is moving downhill, the difference between the maximum and minimum values ​​of the rate of change is greater than the set comparison value, and the curve of the rate of change shows an increasing trend, while the number of changes is less than the set rated number. When the vehicle is in a flat, bumpy road condition, the difference between the maximum and minimum values ​​of the rate of change is less than the set comparison value, and the curve of the rate of change fluctuates with the benchmark line as the baseline and the center, and the number of changes is greater than the set rated number.

5. The transmission control system based on a series-parallel hybrid drive unit according to claim 1, characterized in that: The output shaft speed information also includes left wheel speed information and right wheel speed information. The control panel is also used to calculate the difference between the left wheel speed information and the right wheel speed information, and compare the difference with the rotation difference. If the difference is greater than the rotation difference, the power output at the current time is adjusted based on the magnitude of the difference between the left wheel speed information and the right wheel speed information. If the difference is less than the rotational difference, the process terminates.

6. The transmission control system based on a series-parallel hybrid drive unit according to any one of claims 1 or 5, characterized in that: The power output is adjusted based on the standard spindle speed information corresponding to the clutch shift command at the current time. Then, the phase difference ratio between the output shaft speed information at the current time and the standard spindle speed information is calculated. The control panel adjusts the power output of the internal combustion engine and the electric motor based on the phase difference ratio.

7. The transmission control system based on a series-parallel hybrid power drive device according to claim 1, characterized in that: When the control panel sends a start command to the generator, it also determines whether the current vehicle movement is downhill. If the current vehicle movement is downhill, the control panel sends a start command to the generator; if the current vehicle movement is not downhill, the process terminates.

8. The transmission control system based on a series-parallel hybrid drive unit according to claim 1, characterized in that: When the control panel compares the output shaft speed information at the current time with the standard shaft speed information, the output shaft speed information at the current time is compared with the output shaft speed information when the speed is stable.

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