Vehicle, power take-off control system and method

Abstract

The present invention discloses a vehicle, a power take-off control system and a method. The power take-off control system includes a control terminal, a transmission solenoid valve, a transfer case solenoid valve, a first sensor, a second sensor and a controller. Since the controller is configured to output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to a power take-off mode signal, and output a speed control signal to the speed control terminal based on a first speed signal or a second speed signal, the power take-off speed in different power take-off modes can reach a preset target speed, thereby realizing automatic control of different power take-off modes and thereby improving the reliability of vehicle parking power take-off.

Description

Technical Field

[0001] The present application relates to the field of control technology, and in particular to a vehicle, a power take-off control system and a method. Background Art

[0002] With the rapid development of automotive electronics, intelligent vehicle control technology is becoming increasingly mature, especially for heavy-duty vehicles. As large platforms, heavy-duty vehicles carry a growing number of mounted devices, each powered by the vehicle's engine. However, traditional manual operation relies on the operator's experience to determine the power source for these devices. Inexperience can lead to power take-off failure during parking and even damage to components.

[0003] Therefore, how to improve the reliability of vehicle parking power taking is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The vehicle, power take-off control system and method of the present invention improve the reliability of parking power take-off of the vehicle.

[0005] The embodiments of the present invention provide the following solutions:

[0006] In a first aspect, an embodiment of the present invention provides a power take-off control system, the system comprising: a control terminal, a transmission solenoid valve, a transfer case solenoid valve, a first sensor, a second sensor, and a controller;

[0007] The first input terminal of the controller is connected to the first output terminal of the control terminal, and the controller is configured to receive a power take-off mode signal output by the control terminal;

[0008] The second input end of the controller is connected to the output end of the first sensor, and the controller is configured to receive a first speed signal output by the first sensor, wherein the first speed signal is a speed signal of the transmission power take-off shaft;

[0009] The third input terminal of the controller is connected to the output terminal of the second sensor, and the controller is configured to receive a second speed signal output by the second sensor, wherein the second speed signal is a speed signal of the transfer power take-off shaft;

[0010] The first output end of the controller is connected to the input end of the transmission solenoid valve, the second output end of the controller is connected to the input end of the transfer case solenoid valve, and the third output end of the controller is connected to the speed control end of the vehicle;

[0011] The controller is configured to output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to the power take-off mode signal, and output a speed control signal to the speed control end based on the first speed signal or the second speed signal, so that the power take-off speed in different power take-off modes reaches a preset target speed.

[0012] In an optional embodiment, the third output terminal of the controller is connected to the speed control terminal of the engine on the vehicle, and the fourth output terminal of the controller is connected to the speed control terminal of the transmission on the vehicle;

[0013] The controller is further configured to output a speed control signal to the speed control terminal based on the first speed signal, and to output a speed change control signal to the speed change control terminal based on the second speed signal.

[0014] In an optional embodiment, the system further comprises: a gear switch, a neutral gear solenoid valve and a working gear solenoid valve;

[0015] The fourth input terminal of the controller is connected to the output terminal of the gear switch and is configured to receive the gear position signal of the transfer case output by the gear switch and send it to the controller;

[0016] The fifth output end of the controller is connected to the input end of the neutral solenoid valve, and the sixth output end of the controller is connected to the input end of the working gear solenoid valve. The controller is also configured to output a valve control signal to the neutral solenoid valve or the working gear solenoid valve based on the gear signal.

[0017] In an optional embodiment, the fifth input terminal of the controller is connected to the power supply terminal of the vehicle power supply interface, and the system further includes a power switch;

[0018] The seventh output terminal of the controller is connected to the control terminal of the power switch. The controller is further configured to receive a power signal output by the power terminal and send a control signal to the control terminal based on the power signal.

[0019] In an optional embodiment, the sixth input terminal of the controller is connected to the second output terminal of the control terminal, and the controller is configured to receive multiple speed calibration signals from the control terminal, each of the speed calibration signals corresponding to the target speed in each power take-off mode.

[0020] In a second aspect, an embodiment of the present invention further provides a vehicle, comprising the power take-off control system described in any one of the first aspects.

[0021] In a third aspect, an embodiment of the present invention further provides a power take-off control method, which is applied to any power take-off control system described in the first aspect, and the method includes:

[0022] receiving a power take-off mode signal of a vehicle;

[0023] outputting a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to the power take-off mode signal;

[0024] receiving a first speed signal of the transmission power take-off shaft and / or a second speed signal of the transfer power take-off shaft;

[0025] A speed control signal is output to the vehicle according to the first speed signal or the second speed signal, so that the power take-off speed of the vehicle in different power take-off modes reaches a preset target speed.

[0026] In an optional embodiment, before receiving the power take-off mode signal of the vehicle, the method further includes:

[0027] receiving a rotational speed calibration signal of the vehicle in different power take-off modes;

[0028] The target speed corresponding to the power take-off mode is updated according to the speed calibration signal.

[0029] In an optional embodiment, after receiving the power take-off mode signal of the vehicle, the method further includes:

[0030] Get the current gear position of the transfer case;

[0031] The mode control signal is output after the transmission of the vehicle is separated from the axle according to the current gear position, and the gear position of the transfer case is updated to an initial state after the power take-off is completed.

[0032] In an optional embodiment, after receiving the first speed signal of the transmission power take-off shaft and / or the second speed signal of the transfer power take-off shaft, the method further includes:

[0033] outputting a speed control signal to the engine of the vehicle according to the first speed signal;

[0034] A speed change control signal is output to a transmission of the vehicle according to the second speed signal.

[0035] Compared with the prior art, the vehicle, power take-off control system and method of the present invention have the following advantages:

[0036] The power take-off control system of the present invention includes a control terminal, a transmission solenoid valve, a transfer case solenoid valve, a first sensor, a second sensor, and a controller; a first input end of the controller is connected to a first output end of the control terminal, and the controller is configured to receive a power take-off mode signal output by the control terminal; a second input end of the controller is connected to the output end of the first sensor, and is configured to receive a first speed signal output by the first sensor, the first speed signal being a speed signal of a transmission power take-off shaft; a third input end of the controller is connected to the output end of the second sensor, and is configured to receive a second speed signal output by the second sensor, the second speed signal being a speed signal of a transfer case power take-off shaft; a first output end of the controller is connected to an input end of the transmission solenoid valve, a second output end of the controller is connected to an input end of the transfer case solenoid valve, and a third output end of the controller is connected to a speed control end of the vehicle; because the controller is configured to output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve based on the power take-off mode signal, and to output a speed control signal to the speed control end based on the first speed signal or the second speed signal, the power take-off speed in different power take-off modes can reach a preset target speed, thereby achieving automatic control of different power take-off modes and thereby improving the reliability of the vehicle's parking power take-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A schematic structural diagram of a power take-off control system provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of ports of a controller provided in an embodiment of the present invention;

[0040] Figure 3 This is a flow chart of a power take-off control method provided by an embodiment of the present invention.

[0041] Explanation of reference numerals: 1-engine, 2-transmission, 3-speed transmission power take-off, 4-speed transmission power take-off shaft, 5-transfer case, 6-transfer power take-off, 7-transfer power take-off shaft, 8-axle;

[0042] 11-Control terminal, 12-Transmission solenoid valve, 13-Transfer case solenoid valve, 14-First sensor, 15-Second sensor, 16-Controller, 17-Gear switch. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the embodiments of the present invention.

[0044] The power take-off control system proposed in the embodiment of the present invention can be applied to the vehicle-mounted power take-off system of heavy vehicles. After the vehicle is parked, the vehicle-mounted power take-off system takes power to the vehicle's upper-mounted equipment. The upper-mounted equipment can be configured according to the type of vehicle and actual needs, such as oil pumps, compressors, etc. Figure 1 The vehicle-mounted power take-off system consists of an engine 1, a transmission 2, a transmission power take-off 3, a transfer case 5, and a transfer power take-off 6. The engine 1 is connected to the transmission 2 via a clutch. The power output of the engine 1 undergoes a first-stage speed change in the transmission 2 and is then output to the transmission power take-off 3. After the transmission power take-off 3 is connected to the transmission 2, the transmission power take-off shaft 4 immediately outputs the power to the corresponding upper-mounted equipment, thereby realizing the power output of the transmission power take-off 3. Similarly, the power output of the engine 1 undergoes multiple speed changes in the transmission 2 and is then output to the transfer case 5. The transfer case 5 can output power to the axle 8 or the transfer power take-off 6. When the transfer case 5 outputs power to the axle 8, it drives the vehicle forward or backward. When the transfer case 5 outputs power to the transfer power take-off 6, the transfer power take-off shaft 7 immediately outputs power to the corresponding upper-mounted equipment, thereby realizing the power output of the transfer power take-off 6. The following embodiments of the present invention will specifically explain how to implement automatic control of the power take-off control system in different power take-off modes.

[0045] Please continue reading Figure 1 , Figure 1Schematic diagram of the structure of a power take-off control system provided by an embodiment of the present invention, the system includes: a control terminal 11, a transmission solenoid valve 12, a transfer case solenoid valve 13, a first sensor 14, a second sensor 15 and a controller 16; a first input end of the controller 16 is connected to a first output end of the control terminal 11, and the controller 16 is configured to receive a power take-off mode signal output by the control terminal 11; a second input end of the controller 16 is connected to an output end of the first sensor 14, and the controller 16 is configured to receive a first speed signal output by the first sensor 14, wherein the first speed signal is a speed signal of the speed change power take-off shaft 4; a third input end of the controller 16 is connected to an output end of the second sensor 15 Output end, the controller 16 is configured to receive the second speed signal output by the second sensor 15, wherein the second speed signal is the speed signal of the transfer power take-off shaft 7; the first output end of the controller 16 is connected to the input end of the transmission solenoid valve 12, the second output end of the controller 16 is connected to the input end of the transfer case solenoid valve 13, and the third output end of the controller 16 is connected to the speed control end of the vehicle; the controller 16 is configured to output a mode control signal to the transmission solenoid valve 12 and / or the transfer case solenoid valve 13 according to the power take-off mode signal, and output a speed control signal to the speed control end based on the first speed signal or the second speed signal, so that the power take-off speed under different power take-off modes reaches the preset target speed.

[0046] Specifically, the control terminal can be a button or joystick installed on the vehicle, or an interactive terminal including an LCD screen, installed in the vehicle's cab or at a pre-set location convenient for operating body-mounted equipment. When implementing power take-off, the operator sends a power take-off mode signal to the controller via the control terminal. The controller receives the power take-off mode signal via a first input terminal to determine the power take-off mode of the vehicle's onboard power take-off system. Power take-off modes include power take-off from the transmission power take-off alone, power take-off from the transfer case alone, and power take-off from both the transmission and the transfer case simultaneously.

[0047] When the power take-off mode is for the transmission power take-off to be used alone, the controller outputs a mode control signal via the first output terminal to control the engagement of the transmission solenoid valve, executing the power take-off operation of the transmission power take-off. Based on the first speed signal input by the first sensor, the controller outputs a speed control signal to the vehicle's speed control terminal, ensuring that the power take-off speed during the transmission power take-off reaches the target speed. The speed control terminal may be a speed control interface of the engine controller, outputting the speed control signal to the engine, which then operates the transmission power take-off shaft at the target speed based on the speed ratio. The target speed may be determined based on the operating requirements of the upper equipment, as long as it can stably drive the load. Similarly, when the power take-off mode is for the splitter power take-off to be used alone, the controller outputs a mode control signal via the second output terminal to control the engagement of the splitter solenoid valve, executing the power take-off operation of the splitter power take-off. Based on the second speed signal input by the second sensor, the controller outputs a speed control signal to ensure that the power take-off speed during the splitter power take-off reaches the target speed. When the power take-off mode is for the transmission transfer case to take power simultaneously, the transmission solenoid valve and the transfer case solenoid valve are controlled to perform the attraction action, and a speed control signal is output based on the first speed signal or the second speed signal corresponding to the input of the first sensor or the second sensor, so that the transmission power take-off shaft and the transfer case power take-off shaft reach the same target speed.

[0048] In practical applications, different target speeds may need to be matched when operating a transmission power take-off (PTT) or a splitter power take-off (PTT). Controlling only the engine speed will result in limitations in matching the target speed. Therefore, in one specific embodiment, the controller's third output terminal is connected to a speed control terminal of the vehicle's engine, and the controller's fourth output terminal is connected to a speed control terminal of the vehicle's transmission. The controller is further configured to output a speed control signal to the speed control terminal based on the first speed signal, and to output a speed control signal to the speed control terminal based on the second speed signal.

[0049] Specifically, the third output terminal of the controller is connected to the speed control terminal of the engine on the vehicle, and the fourth output terminal of the controller is connected to the speed control terminal of the transmission on the vehicle. The multi-stage speed change principle of the transmission can be utilized, and different target speeds can be implemented when the transmission transfer case takes power at the same time to improve the applicability of the power take-off control system.

[0050] In actual application, when implementing a separate power take-off operation, the transfer case must first be separated from the axle's transmission structure and then reconnected to the transfer case's transmission structure. If the transfer case and the axle are not separated when the transfer case's power take-off is executed, the power take-off may fail. Based on this, in a specific embodiment, the system further includes: a gear switch 13, a neutral solenoid valve, and a working gear solenoid valve;

[0051] The fourth input terminal of the controller is connected to the output terminal of the gear switch and is configured to receive the gear signal of the transfer case output by the gear switch and transmit it to the controller; the fifth output terminal of the controller is connected to the input terminal of the neutral solenoid valve, and the sixth output terminal of the controller is connected to the input terminal of the working gear solenoid valve. The controller is also configured to output a valve control signal to the neutral solenoid valve or the working gear solenoid valve based on the gear signal.

[0052] Specifically, the controller reads the transfer case's gear position through the gear switch. For example, when the gear position signal is a high level 1, the transfer case and the axle are engaged; when the gear position signal is a low level 0, the transfer case and the axle are disengaged. When the transfer case is in the working gear and transfer case power take-off is required, the controller outputs a valve control signal to control the neutral solenoid valve to engage, shifting the transfer case into neutral and disengaging the transfer case from the axle before performing the power take-off operation to improve power take-off reliability. After the transfer case's power take-off is complete, the controller outputs a valve control signal to the working gear solenoid valve to engage the transfer case and the axle, restoring the vehicle to its initial state.

[0053] The upper equipment and the vehicle are often powered independently. If the vehicle is not powered on when the power take-off control system is executing the power take-off control, the control will fail. Based on this, in a specific embodiment, the fifth input terminal of the controller is connected to the power supply terminal of the vehicle power supply interface, and the system also includes a power switch;

[0054] The seventh output terminal of the controller is connected to the control terminal of the power switch. The controller is also configured to receive a power signal output by the power terminal and send a control signal to the control terminal based on the power signal.

[0055] Specifically, the power supply switch can be a contactor or a relay; after the controller receives the power take-off mode signal, it determines whether the vehicle is powered on through the power supply signal. If it is powered on, it controls the corresponding solenoid valve to perform the power take-off action; if it is not powered on, it sends a control signal to the power supply switch based on the power supply signal to control the power supply switch to power on the vehicle.

[0056] In practical applications, due to the diverse application scenarios of upper-mounted equipment, the target speeds required for operation of the upper-mounted equipment vary in different scenarios. Calibrating the target speed to a fixed value will affect the applicability of the upper-mounted equipment. Based on this, in one specific embodiment, the sixth input terminal of the controller is connected to the second output terminal of the control terminal. The controller is configured to receive multiple speed calibration signals from the control terminal, each speed calibration signal corresponding to the target speed for each power take-off mode.

[0057] Specifically, when the control terminal is an interactive terminal including a liquid crystal screen, the target speed in each power take-off mode can be calibrated through the control terminal, so that the upper-mounted equipment can be suitable for different application scenarios.

[0058] See also Figure 2 The controller of the embodiment of the present invention can be a PLC (Programmable Logic Controller) or a control board integrated with a single-chip microcomputer. It is provided with three CAN (Controller Area Network) ports for information exchange with the upper equipment, engine, and transmission respectively; one IO port is provided, which is connected to the gear switch and is used to obtain the gear signal of the transfer case to determine the current gear of the transfer case; two PWM ports are provided, which are respectively connected to the first sensor and the second sensor and are used to obtain the real-time speed of the speed change power take-off shaft and the transfer case power take-off shaft; five drive ports are provided, which respectively drive the power supply switch, the neutral solenoid valve, the working gear solenoid valve, the transmission solenoid valve, and the transfer case solenoid valve, so as to realize the control of power on and off of the heavy vehicle, neutral gear of the transfer case, working gear of the transfer case, transmission power take-off, and transfer case power take-off.

[0059] Based on the same inventive concept as the power take-off control system, an embodiment of the present invention further provides a vehicle, comprising any power take-off control system described in the first aspect.

[0060] Based on the same inventive concept as the power take-off control system, the embodiment of the present invention also provides a power take-off control method, which is applied to any of the power take-off control systems. Figure 3 , the method comprising:

[0061] S11. Receive a power take-off mode signal of the vehicle.

[0062] Specifically, the power take-off mode signal can be sent through the control terminal on the vehicle. The controller receives the power take-off mode signal to determine whether the power take-off mode is the transmission power take-off alone, the transfer power take-off alone, or the transmission transfer case and the transfer case taking power at the same time. After receiving the power take-off mode signal, step S12 is entered.

[0063] S12. Output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to the power take-off mode signal.

[0064] Specifically, if the power take-off mode signal indicates that the transmission power take-off is taking power alone, the output mode control signal controls the transmission solenoid valve to be engaged; if the power take-off mode signal indicates that the transfer case power take-off is taking power alone, the output mode control signal controls the transfer case solenoid valve to be engaged; if the power take-off mode signal indicates that the transmission transfer case takes power simultaneously, the output mode control signal controls the transmission solenoid valve and the transfer case solenoid valve to be engaged to enter the corresponding power take-off mode, and enters step S13 after the output mode control signal.

[0065] S13: Receive a first speed signal of the transmission power take-off shaft and / or a second speed signal of the transfer power take-off shaft.

[0066] Specifically, a first sensor can be installed on the transmission power take-off shaft to output a first speed signal. When the transmission power take-off takes power alone, the first speed signal represents the power take-off speed of the transmission power take-off shaft; a second sensor can be installed on the transfer power take-off shaft to output a second speed signal. When the transfer power take-off takes power alone, the second speed signal represents the power take-off speed of the transfer power take-off shaft; when the transmission transfer case takes power at the same time, the controller will receive the first speed signal and the second speed signal, and enter step S14 after receiving the speed signal.

[0067] S14. Outputting a speed control signal to the vehicle according to the first speed signal or the second speed signal, so that the power take-off speed of the vehicle in different power take-off modes reaches a preset target speed.

[0068] Specifically, in order to enable the vehicle to reach the target speed of power take-off in different power take-off modes, when the transmission power take-off is taking power alone, a speed control signal is output to the vehicle according to the first speed signal, and the vehicle's engine outputs corresponding power to make the transmission power take-off shaft reach a preset target speed; when the transfer power take-off is taking power alone, a speed control signal is output to the vehicle according to the second speed signal, and the vehicle's engine outputs corresponding power to make the transfer power take-off shaft reach a preset target speed; when the transmission transfer case takes power at the same time, a speed control signal is output to the vehicle according to the first speed signal or the second speed signal, and the vehicle's engine outputs corresponding power to make the transmission power take-off shaft and the transfer power take-off shaft reach the same target speed.

[0069] Controlling only the engine speed will result in limitations in matching the target speed. Based on this, in a specific embodiment, after receiving the first speed signal of the transmission power take-off shaft and / or the second speed signal of the transfer power take-off shaft, the method further includes:

[0070] A speed control signal is output to the engine of the vehicle according to the first speed signal; and a speed control signal is output to the transmission of the vehicle according to the second speed signal.

[0071] Specifically, the controller reads the first speed signal and outputs a speed control signal to the vehicle's engine. The vehicle's engine then outputs the corresponding power to achieve a preset target speed for the power take-off shaft. The controller also reads the second speed signal and outputs a speed control signal to the vehicle's transmission. The transmission then outputs the corresponding power to achieve a preset target speed for the power take-off shaft. Leveraging the transmission's multi-speed shifting principle, the transfer case can implement different target speeds when simultaneously taking power, improving the applicability of the power take-off control system.

[0072] If the target speed is calibrated to a fixed value, the applicability of the upper-mounted equipment will also be adversely affected. In a specific embodiment, before receiving the power take-off mode signal of the vehicle, the method further includes:

[0073] Receive speed calibration signals of the vehicle in different power take-off modes; and update the target speed of the corresponding power take-off mode according to the speed calibration signals.

[0074] Specifically, the speed calibration signal can be issued based on the operator operating the control terminal. The target speed in each power take-off mode can be calibrated through the control terminal so that the upper equipment can be suitable for different application scenarios.

[0075] In a specific embodiment, after receiving the power take-off mode signal of the vehicle, the method further includes:

[0076] Obtain the current gear position of the transfer case; control the vehicle's transmission and axle to separate according to the current gear position and output a mode control signal, and update the transfer case's gear position to the initial state after power take-off is completed.

[0077] Specifically, the current gear position can be determined by the gear position signal output by the gear switch. When the transfer case is in the working gear and transfer case power take-off is required, the controller outputs a valve control signal to control the neutral solenoid valve to engage, shifting the transfer case into neutral and separating the transfer case from the axle before performing the power take-off operation, thereby improving the reliability of the power take-off. After the transfer case power take-off is completed, the controller outputs a valve control signal to the working gear solenoid valve to engage the transfer case with the axle, restoring the vehicle to its initial state.

[0078] The following embodiments of the present invention will take three power take-off modes, namely, power take-off of a transmission power take-off alone, power take-off of a transfer case alone, and power take-off of a transmission transfer case at the same time, as examples to elaborate on the power take-off control process in each mode.

[0079] When the controller receives a signal from the upper-mounted device indicating that the transmission power take-off (PTT) is in standalone power take-off mode, it determines whether the heavy-duty vehicle is powered on. If not, it first controls the power switch to turn on to confirm that the heavy-duty vehicle has been powered on. If the heavy-duty vehicle is powered on, it determines whether the engine is started. If not, it controls the engine to start and operate at idle speed. If the engine is idling, it activates the transmission solenoid valve to enable transmission power take-off. If the transmission power take-off (PTT) is detected to be at a power take-off speed, it sends a speed-up command to the engine, increasing it to the calibrated target speed, completing standalone transmission power take-off control, and reporting the command completion result to the upper-mounted device. After power take-off is complete, it receives a transmission power take-off disconnect command and controls the engine to idle speed. If the engine is already idling, it controls the transmission to disconnect the PTO. Once the transmission is confirmed to be disconnected, it controls the engine to shut down, completing the transmission power take-off control, and reporting the "standalone transmission power take-off" command completion result to the upper-mounted device.

[0080] When the controller receives a power take-off mode signal from the upper-mounted equipment indicating that the transfer case is taking power alone, it determines whether the heavy-duty vehicle is in a powered-on state. If not, it first controls the power switch to turn on to confirm that the heavy-duty vehicle has completed power-on control. If the heavy-duty vehicle is powered on, it determines whether the engine has started. If not, it first controls the engine to start and operate in an idling state. When it is confirmed that the engine is in an idling state, it then controls the transfer case to shift into neutral, the transfer case to perform power take-off (i.e., the transfer case solenoid valve is engaged), and the transmission to shift into forward gear. Finally, it controls the engine speed to accelerate to the calibrated target speed, completes the transfer case power take-off control, and feeds back the result information of the command execution completion to the upper-mounted equipment. After completing the power take-off, it receives a command to disconnect the transfer case power take-off and first controls the engine to slow down to idle speed. If the engine is already operating in the idling state, the transmission is controlled to shift into neutral, the transfer case is disconnected, the transfer case is shifted into the working gear, and finally the engine is controlled to be shut down to complete the transfer case disconnection control and feedback the result information of the execution of the "separate transfer case disconnection force" command to the upper-mounted equipment.

[0081] The controller receives a signal from the upper-mounted equipment indicating simultaneous transmission and transfer case power takeoff. If the transmission is currently taking power, it first controls the engine speed to idle. After confirming that the engine speed has stabilized at idle, it sequentially controls the transfer case to neutral, then engages power, and then engages the transmission in forward gear. Finally, it controls the engine speed to increase to the calibrated transfer case power takeoff output speed, completing the transfer case power takeoff control. The heavy-duty vehicle is now in a simultaneous transmission and transfer case power takeoff mode, and it reports the command completion result to the upper-mounted equipment. If neither the transmission nor the transfer case is taking power, it determines whether the heavy-duty vehicle is powered on. If not, it first controls the power supply switch to turn on to confirm that the heavy-duty vehicle has been powered on. If the heavy-duty vehicle is powered on, it determines whether the engine is started. If not, it controls the engine to start and operate at idle speed. If the engine is already idling, it sequentially controls the transfer case to neutral, then engages power, and then engages the transmission in forward gear. The transmission then controls the power take-off, and finally increases the engine speed to the calibrated transfer case power take-off output speed, completing the simultaneous transmission and transfer case power take-off control. The heavy-duty vehicle is now in the simultaneous transmission and transfer case power take-off mode, and feedback is sent to the upstream equipment indicating the command has been executed.

[0082] After the simultaneous transfer case power takeoff is complete, the system receives a transfer case power cut command. If transfer case power takeoff is required, the engine is first slowed to idle upon receiving the transfer case power cut command. If the engine is already idling, the system then controls the transfer case power cut. After confirming that the transfer case power cut has been completed, the transfer case power cut operation is completed. Finally, the system controls the engine speed to increase to the calibrated transfer case power takeoff output speed, completing the transfer case power cut process when both the transmission and transfer case are simultaneously taking power. The system also sends feedback to the upstream device regarding the "transmission power cut" command execution result. If transfer case power takeoff is required, the system first controls the engine to idle upon receiving the transfer case power cut command. If the engine is already idling, the system then controls the transmission to neutral, the transfer case power cut, and the transfer case to a higher gear, completing the transfer case power cut control. After confirming that the transfer case has disengaged power, the engine speed is then controlled to increase to the calibrated transmission power take-off output speed value, completing the process of disengaging the transfer case when both the transmission and the transfer case are disengaged simultaneously, and feedback is given to the upper-mounted device regarding the result of the "disengaging the transfer case power take-off" command. If the transmission and transfer case need to disengage power simultaneously, after receiving the command to disengage the transmission and the transfer case simultaneously, the engine is first controlled to slow down to idle speed. If the engine is already operating at idle speed, the transmission is then controlled to shift to neutral, the transfer case to disengage power, the transmission to disengage power, and the transfer case to a higher gear. After confirming that both the transmission and the transfer case have disengaged power, the engine is then controlled to shut down, completing the process of disengaging the transmission and the transfer case simultaneously, and feedback is given to the upper-mounted device regarding the result of the "disengaging the transmission and the transfer case simultaneously" command.

[0083] It should be noted that the controller can also receive the "engine shutdown" command of the upper equipment. After receiving the engine shutdown command, it first determines whether the current transmission and transfer case are taking power. If they are taking power, it first executes the transmission and transfer case power-off control process. After confirming that the power-off process has been completed and the engine has been shut down, it controls the heavy vehicle power supply switch to cut off the power, completes the engine shutdown process, and feeds back the result information of the "engine shutdown" command execution to the upper equipment.

[0084] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0085] 1. The power take-off control system includes a control terminal, a transmission solenoid valve, a transfer case solenoid valve, a first sensor, a second sensor, and a controller. The controller is configured to output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve based on a power take-off mode signal, and to output a speed control signal to a speed control terminal based on a first speed signal or a second speed signal. The power take-off speed in different power take-off modes can reach a preset target speed, thereby achieving automatic control of different power take-off modes and improving the reliability of the vehicle's parking power take-off.

[0086] 2. It realizes the intelligent control of transfer case power take-off, transmission power take-off and simultaneous power take-off under the parking condition of heavy vehicles. It can calibrate the power take-off working speed value according to the actual needs of the upper equipment, realize the full process automatic control function of heavy vehicle power take-off, improve the intelligence level of heavy vehicle parking power take-off, avoid human operation errors, and improve the stability of heavy vehicle parking power take-off.

[0087] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0091] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0092] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A power take-off control system, characterized in that: The system includes: a control terminal, a transmission solenoid valve, a transfer case solenoid valve, a first sensor, a second sensor and a controller; The first input end of the controller is connected to the first output end of the control terminal, and the controller is configured to receive a power take-off mode signal output by the control terminal; The second input end of the controller is connected to the output end of the first sensor, and the controller is configured to receive a first speed signal output by the first sensor, wherein the first speed signal is a speed signal of the transmission power take-off shaft; The third input terminal of the controller is connected to the output terminal of the second sensor, and the controller is configured to receive a second speed signal output by the second sensor, wherein the second speed signal is a speed signal of the transfer power take-off shaft; The first output end of the controller is connected to the input end of the transmission solenoid valve, the second output end of the controller is connected to the input end of the transfer case solenoid valve, and the third output end of the controller is connected to the speed control end of the vehicle; The controller is configured to output a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to the power take-off mode signal, and output a speed control signal to the speed control terminal based on the first speed signal or the second speed signal, so that the power take-off speed in different power take-off modes reaches a preset target speed; The sixth input terminal of the controller is connected to the second output terminal of the control terminal, and the controller is configured to receive a plurality of speed calibration signals from the control terminal, each of the speed calibration signals corresponding to a target speed in each power take-off mode; When the transfer case is in the working gear and the transfer case needs to be powered, the controller outputs a valve control signal to control the neutral solenoid valve to close, putting the transfer case into neutral, separating the transfer case from the axle, and then performing the power take-off operation; Determine whether the heavy-duty vehicle is in a powered-on working state. If not, first control the power switch to turn on to confirm that the heavy-duty vehicle has completed power-on control; The fifth input terminal of the controller is connected to the power supply terminal of the vehicle power supply interface, and the system further includes a power switch; The seventh output terminal of the controller is connected to the control terminal of the power switch. The controller is further configured to receive a power signal output by the power terminal and send a control signal to the control terminal based on the power signal.

2. The power take-off control system according to claim 1, characterized in that: The third output terminal of the controller is connected to the speed control terminal of the engine on the vehicle, and the fourth output terminal of the controller is connected to the speed control terminal of the transmission on the vehicle; The controller is further configured to output a speed control signal to the speed control terminal based on the first speed signal, and to output a speed change control signal to the speed change control terminal based on the second speed signal.

3. The power take-off control system according to claim 1, characterized in that: The system further comprises: a gear switch, a neutral gear solenoid valve and a working gear solenoid valve; The fourth input terminal of the controller is connected to the output terminal of the gear switch and is configured to receive the gear position signal of the transfer case output by the gear switch and send it to the controller; The fifth output end of the controller is connected to the input end of the neutral solenoid valve, and the sixth output end of the controller is connected to the input end of the working gear solenoid valve. The controller is also configured to output a valve control signal to the neutral solenoid valve or the working gear solenoid valve based on the gear signal.

4. A vehicle, characterized in that: The vehicle comprises the power take-off control system according to any one of claims 1-3.

5. A power take-off control method, characterized in that: Applied to the power take-off control system according to any one of claims 1 to 3, the method comprises: receiving a power take-off mode signal of a vehicle; outputting a mode control signal to the transmission solenoid valve and / or the transfer case solenoid valve according to the power take-off mode signal; receiving a first speed signal of the transmission power take-off shaft and / or a second speed signal of the transfer power take-off shaft; A speed control signal is output to the vehicle according to the first speed signal or the second speed signal, so that the power take-off speed of the vehicle in different power take-off modes reaches a preset target speed.

6. The power take-off control method according to claim 5, characterized in that: Before receiving the power take-off mode signal of the vehicle, the method further includes: receiving a rotational speed calibration signal of the vehicle in different power take-off modes; The target speed corresponding to the power take-off mode is updated according to the speed calibration signal.

7. The power take-off control method according to claim 5, characterized in that: After receiving the power take-off mode signal of the vehicle, the method further includes: Get the current gear position of the transfer case; The mode control signal is output after the transmission of the vehicle is separated from the axle according to the current gear position, and the gear position of the transfer case is updated to an initial state after the power take-off is completed.

8. The power take-off control method according to claim 5, characterized in that: After receiving the first speed signal of the transmission power take-off shaft and / or the second speed signal of the transfer power take-off shaft, the method further includes: outputting a speed control signal to the engine of the vehicle according to the first speed signal; A speed change control signal is output to a transmission of the vehicle according to the second speed signal.

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