An automatic gear shift control system of a hybrid transmission

Abstract

The application relates to the technical field of vehicle gear shifting control, in particular to an automatic gear shifting control system of a hybrid transmission, which comprises a vehicle controller, a gear shifting controller and a gear shifting actuator, the gear shifting controller comprises an application layer and a His layer, the application layer comprises an STM system state module, an SLM gear position self-learning module, an SCM gear position scheduling module, a PCM gear position execution module, a StaM stall and CLM current limiting module, a PWM processing module, an ISP input signal processing module, an FDM fault module and a COM communication module. The system is developed by adopting a layered architecture model, the software application layer, the bottom layer and the hardware are simultaneously developed and tested and verified, the development cycle and the coupling degree can be reduced, and the problem tracking and searching are facilitated; meanwhile, the gear position self-learning control strategy is realized through the cooperation between the modules in the system, and the optimal control gear position can be achieved for the gear points of each transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle gear shifting control, and particularly relates to an automatic gear shifting control system of a hybrid transmission. BACKGROUND

[0002] The transmission is a gear box for changing transmission ratio and motion direction, which is located between the clutch and the central transmission. The main function of the transmission is to change the driving force and the running speed of the vehicle (gear shifting) under the condition that the engine speed and torque are unchanged, to enable the vehicle to run in reverse (gear reversing), and to enable the engine to be parked without being turned off (neutral gear).

[0003] During the gear shifting of the transmission, there is a gap between the shifting fork and the synchronizing ring, the synchronizing gear and the meshing gear, so that the actual gear engagement cannot be a point but a range. During the assembly of the transmission, the differences in the workers and the process can also cause different differences in the gears of the transmission.

[0004] Therefore, there is an urgent need for a new technology to solve the above technical problems and overcome the complexity in the development stage of the gear shifting controller. SUMMARY

[0005] The present application aims to overcome the problems of the prior art and provides an automatic gear shifting control system of a hybrid transmission to solve the technical problem of the error in the gears of the transmission in the prior art.

[0006] The above object is achieved by the following technical scheme:

[0007] An automatic gear shifting control system of a hybrid transmission comprises a vehicle controller, a gear shifting controller and a gear shifting actuator, the gear shifting controller comprises an application layer and a His layer, the application layer comprises an STM system state module, an SLM gear self-learning module, an SCM gear scheduling module, a PCM gear execution module, a StaM stall and CLM current limiting module, a PWM processing module, an ISP input signal processing module, a FDM fault module and a COM communication module;

[0008] The STM system state module is connected with the SLM gear self-learning module and the SCM gear scheduling module, the SLM gear self-learning module and the SCM gear scheduling module are connected with the PCM gear execution module, the PCM gear execution module is connected with the StaM stall and CLM current limiting module, and the StaM stall and CLM current limiting module is connected with the PWM processing module.

[0009] The ISP input signal processing module, the FDM fault module, the COM communication module, the SLM gear self-learning module, the SCM gear scheduling module, the PCM gear execution module, the StaM stall and CLM current limiting module, and the PWM processing module respectively realize interaction with the bottom layer through the His layer.

[0010] Further, the whole vehicle controller realizes communication with the gear shifting controller through a CAN communication mode.

[0011] Further, the SLM gear self-learning module and the SCM gear scheduling module are controlled to switch through the STM system state module.

[0012] Further, the SCM gear scheduling module determines the specific gear in which the gear shifter is located according to the position voltage of the gear shifter collected by the ISP input signal processing module, and then sends the target gear voltage and PWM switch that need to be executed to the PCM gear execution module according to the target gear instruction and gear action instruction sent by the whole vehicle controller; the PCM gear execution module performs segmented adaptive PID operation according to the target gear voltage and PWM switch sent by the SCM gear scheduling module and the position voltage of the gear shifter fed back by the ISP input signal processing module, and calculates the duty cycle; and then the motor current is limited according to the different working states of the gear shifter, the PWM duty cycle of the motor, the control state of the motor PWM, and the motor speed, and the motor current limiting flag bit, the motor stall flag bit, the motor control duty cycle after current limiting, and the PWM control state are output.

[0013] Further, the SLM gear self-learning module responds to the self-learning action instruction, first performs the low gear self-learning action, transmits the action to the bottom layer through the PCM gear execution module, controls the motor to move, judges whether the motor stalls according to the movement frequency of the motor fed back by the ISP input signal processing module, decides whether the low gear self-learning is completed, and then performs high gear self-learning; the high gear self-learning is the same as the low gear self-learning.

[0014] Further, after the low gear self-learning and the high gear self-learning are completed, the motor is regulated to move to the middle N gear position through PID, all self-learned gear information is stored in the memory, and then after being powered on again, the gear shifter is switched from the normal gear to the target gear.

[0015] Further, the gear-in process in the PCM gear execution module includes three processes, including an idle stroke stage, a synchronization stage, and a locking stage.

[0016] Furthermore, a HAL hardware abstraction layer is connected on the His layer to abstract the hardware.

[0017] Beneficial effects

[0018] The automatic shift control system for a hybrid transmission provided by this invention adopts a layered architecture model for development. The software application layer, the underlying layer, and the hardware are developed, tested, and verified simultaneously, which can reduce the development cycle and coupling, and facilitate the tracking and finding of problems. At the same time, through the cooperation between the modules in the system, a gear self-learning control strategy is realized, which can achieve the optimal control gear point for each transmission. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an automatic shift control system for a hybrid transmission according to the present invention. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the figures and embodiments.

[0021] like Figure 1 As shown, an automatic shift control system for a hybrid transmission includes a vehicle controller, a shift controller, and a shift actuator. The shift controller includes an application layer and a His layer. The application layer includes an STM system status module, an SLM gear self-learning module, an SCM gear scheduling module, a PCM gear execution module, a StaM stall and CLM current limiting module, a PWM processing module, an ISP input signal processing module, an FDM fault module, and a COM communication module.

[0022] The STM system status module is mainly responsible for switching system states, and includes the following functional states:

[0023] Init: Power-on initialization, hardware self-test;

[0024] InitPosn: Initial handshake position with HBU (Vehicle Controller);

[0025] Standby: Default state;

[0026] SelfLrng: Self-learning state;

[0027] Ready: Normal shifting state;

[0028] Debug: Debug mode

[0029] Fault: Failure mode;

[0030] PerShutdown: Requests power off;

[0031] Shutdown: Power off complete.

[0032] The STM system state module in the system is connected with the SLM gear self-learning module and the SCM gear scheduling module respectively, the SLM gear self-learning module and the SCM gear scheduling module are connected with the PCM gear execution module respectively, the PCM gear execution module is connected with the StaM stall and CLM current limiting module, the StaM stall and CLM current limiting module is connected with the PWM processing module;

[0033] The ISP input signal processing module, the FDM fault module, the COM communication module, the SLM gear self-learning module, the SCM gear scheduling module, the PCM gear execution module, the StaM stall and CLM current limiting module and the PWM processing module are respectively connected with the bottom layer through the His layer.

[0034] The HAL hardware abstraction layer is further connected on the His layer, for abstracting hardware.

[0035] The vehicle controller in the embodiment realizes communication with the gear shift controller through the CAN communication mode, the CAN communication is a serial communication network capable of realizing distributed real-time control, and has the advantages of low cost and high performance.

[0036] The system also corresponds to a set of gear learning method, first, the gear self-learning of each gearbox is performed, then the target gear range is re-planned and stored according to the actual gear learned, and at the same time, since the gear shift execution mechanism is affected by factors such as its own temperature, environmental temperature and battery voltage, different parameter combinations are also needed for better control, therefore, a segmented adaptive PID algorithm is adopted for gear shift motor control.

[0037] The SLM gear self-learning module and the SCM gear scheduling module are controlled and switched through the STM system state module.

[0038] Specifically, in the SCM gear scheduling module state, the SCM gear scheduling module determines the specific gear through the position voltage of the gear actuator collected by the ISP input signal processing module, and then sends the target gear voltage and PWM switch required to be executed to the PCM gear execution module according to the target gear instruction and gear action instruction sent by the vehicle controller; the PCM gear execution module performs segmented adaptive PID operation according to the target gear voltage and PWM switch sent by the SCM gear scheduling module and the position voltage of the gear actuator fed back by the ISP input signal processing module, and calculates the duty cycle; and then limits the motor current according to the different working states of the gear actuator, the PWM duty cycle of the motor, the control state of the motor PWM, and the motor speed, and outputs the motor current limit flag, the motor stall flag, the motor control duty cycle after current limiting, and the PWM control state.

[0039] In the SLM gear self-learning module state, the SLM gear self-learning module responds to the self-learning action instruction, first performs low gear self-learning, transmits the action to the bottom layer through the PCM gear execution module, controls the motor to move, judges whether the motor stalls according to the movement frequency of the motor fed back by the ISP input signal processing module, determines whether the low gear self-learning is completed, and then performs high gear self-learning; the high gear self-learning is the same as the low gear self-learning; after the low gear self-learning and the high gear self-learning are completed, the motor moves to the middle N gear position through PID adjustment, all self-learned gear information is stored in the memory through EEPROM (Electrically Erasable Programmable Read-Only Memory), and then after power-on, the gear actuator is switched from the normal gear to the target gear.

[0040] In this embodiment, after the vehicle system is powered on, each controller is powered on and initialized, the gear controller is self-checked successfully, the system state is determined with the vehicle controller, and then the gear controller enters the Ready mode to wait for a gear instruction. The system state is switched in the STM system state module.

[0041] The vehicle controller sends the target gear and the gear action instruction to the gear controller through the CAN communication mode according to the speed difference and other judgment conditions of the actual speed regulation, and the scheduling logic of the gear is switched in the SCM gear scheduling module.

[0042] In the power-on initialization stage, whether the current gear is in the neutral position is judged according to the position voltage of the gear actuator, and after the neutral position is reset, the initialization completion flag is sent, and the system state is switched to the Ready mode.

[0043] In the normal shift mode, when the target gear and the gear action instruction are sent by the vehicle controller, the SCM gear scheduling module switches to the state in the gear engagement process, sends the corresponding flag bit to the vehicle controller, and sends the target gear voltage and the PWM state to the PCM gear execution module. The gear engagement process in the PCM gear execution module is divided into three processes, namely the idle stroke stage, the synchronization stage and the locking stage.

[0044] In the idle stroke stage, the synchronization gear does not contact, and the shift motor needs to run quickly to reduce the shift time. After the synchronization ring contacts the gear, the load increases. In order to reduce the shift impact of the gear combination, the controller gradually increases the shift force in a certain gradient until the gear synchronization speed, and the combination sleeve locks the synchronization gear pair.

[0045] The duty cycle and the PWM mode calculated by the PCM gear execution module are transmitted to the StaM stall and CLM current limiting module. Whether the shift motor is in stall is judged according to the frequency of the ISP input signal processing module. If stall occurs, the power limiting is performed, and the output power of the PCM gear execution module is compared to output the minimum value, drive the shift motor to move, and then transmit to the bottom layer to drive the motor to move.

[0046] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can think of changes or replacements within the technical range disclosed by the present application, which are all covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An automatic shift control system for a hybrid transmission, characterized in that, It includes a vehicle controller, a shift controller, and a shift actuator. The shift controller includes an application layer and a His layer. The application layer includes an STM system status module, an SLM gear self-learning module, an SCM gear scheduling module, a PCM gear execution module, a StaM stall and CLM current limiting module, a PWM processing module, an ISP input signal processing module, an FDM fault module, and a COM communication module. The STM system status module is mainly responsible for switching system states, and includes the following functional states: Init: Power-on initialization, hardware self-test; InitPosn: Initial handshake position with the vehicle controller; Standby: Default state; SelfLrng: Self-learning state; Ready: Normal shifting state; Debug: Debug mode; Fault: Fault mode; PerShutdown: Request power-down; Shutdown: Power-down completed. The STM system status module is connected to the SLM gear self-learning module and the SCM gear scheduling module, respectively. The SLM gear self-learning module and the SCM gear scheduling module are connected to the PCM gear execution module, respectively. The PCM gear execution module is connected to the StaM stall and CLM current limiting module, and the StaM stall and CLM current limiting module is connected to the PWM processing module. The SCM gear scheduling module determines the specific gear position by collecting the position voltage of the shift actuator from the ISP input signal processing module. Then, based on the target gear command and gear action command sent by the vehicle controller, it sends the target gear voltage and PWM switch to the PCM gear execution module. The PCM gear execution module performs segmented adaptive PID calculation to calculate the duty cycle based on the target gear voltage and PWM switch sent by the SCM gear scheduling module and the shift actuator position voltage fed back in real time by the ISP input signal processing module. The SLM gear self-learning module responds to the self-learning action command, first performing low-gear self-learning, which is transmitted to the lower layer through the PCM gear execution module to control the motor movement. Then, based on the motor movement frequency fed back in real time by the ISP input signal processing module, it determines whether the motor has stalled, thereby determining whether the low-gear self-learning is complete, and then performs high-gear self-learning; the high-gear self-learning is the same as the low-gear self-learning. The gear shifting process in the PCM gear execution module is divided into three stages: the idle stroke stage, the synchronization stage, and the locking stage. In the idle stroke stage, the synchronization gears are not in contact, and the shift motor needs to run quickly to reduce the shifting time. After the synchronization ring contacts the gears, the load increases. In order to reduce the shifting impact of gear engagement, the shifting force of the shift controller gradually increases with a certain gradient until the gears reach the synchronous speed, and then the engagement sleeve locks the synchronous gear pair. The ISP input signal processing module, FDM fault module, COM communication module, SLM gear self-learning module, SCM gear scheduling module, PCM gear execution module, StaM stall and CLM current limiting module, and PWM processing module interact with the underlying layer through the His layer. The His layer is also connected to the HAL hardware abstraction layer, which is used to abstract the hardware. The vehicle controller communicates with the gear shift controller via CAN communication. Based on the speed difference judgment condition of the actual speed adjustment, the vehicle controller sends the target gear and gear shifting action command to the gear shift controller via CAN communication. Then, based on the different working states of the gear shift actuator, the PWM duty cycle of the motor, the control state of the motor PWM, and the motor speed, the vehicle controller limits the motor current and outputs the motor current limit flag, the motor stall flag, the motor control duty cycle after current limiting, and the PWM control state.

2. The automatic shift control system for a hybrid transmission according to claim 1, characterized in that, The SLM gear self-learning module and the SCM gear scheduling module are switched via the STM system status module.

3. The automatic shift control system for a hybrid transmission according to claim 1, characterized in that, After the low-gear self-learning and the high-gear self-learning are completed, the motor is adjusted to the middle N gear position by PID control. All self-learned gear information is stored in the memory. Then, after power is turned on again, the gear shifting actuator switches from the normal gear to the target gear.

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