A transfer case control system and method for driving a hydraulic pump

Abstract

The present invention proposes a transfer case control system for driving a hydraulic pump, comprising: a controller, a transmission speed acquisition module, a transfer case, an engine ECU, a mode switch module, a solenoid valve module, a drive module, and an in-position signal switch module. The output end of the controller is communicatively connected with the control end of the transfer case through the solenoid valve module, and is used to obtain a switch signal of the mode switch module, a clutch signal of the engine ECU, speed information of the transmission speed acquisition module, and a switch in-position signal. The transfer case and the drive module are controlled through the solenoid valve module according to the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in-position signal. The present invention also proposes a transfer case control method for driving a hydraulic pump, which effectively improves the control reliability of the transfer case.

Description

Technical Field

[0001] The invention relates to the field of transfer case control, and in particular to a transfer case control system and method for driving a hydraulic pump. Background Art

[0002] At present, the energy source for fans, motors and water pumps of washing and sweeping vehicles mainly relies on the output of additional engines. The emissions of additional engines are currently only in accordance with the National IV standard, which is far from meeting the national standards for engines to implement the National VI emission standards.

[0003] The current solution is to add a transfer case to the whole vehicle and carry out control design on the transfer case so that the transfer case can drive the hydraulic pump. This can replace the original additional engine system as a whole. It can not only reduce the overall pollution emissions of the washing and sweeping vehicle by 10%, but also improve the utilization rate of the engine output power by adding a control system, and extend the single-trip operation time by about 30%.

[0004] However, in the current transfer case control, the transfer case control is only performed based on a single signal or information, and the control reliability is not high, which is not conducive to improving the reliability of the transfer case control. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention innovatively proposes a transfer case control system and method for driving a hydraulic pump, which effectively solves the problem of low transfer case control reliability caused by the prior art and effectively improves the transfer case control reliability.

[0006] The first aspect of the present invention provides a transfer case control system for driving a hydraulic pump, comprising: a controller, a transmission speed acquisition module, a transfer case, an engine ECU, a mode switch module, a solenoid valve module, a drive module, and an in-place signal switch module, wherein the speed output end of the transmission speed acquisition module is communicatively connected to the speed input end of the controller, the clutch signal output end of the engine ECU is communicatively connected to the clutch signal input end of the controller, the switch signal output end of the mode switch module is communicatively connected to the switch signal input end of the controller, the transfer case is transmission-connected to the drive module, the in-place signal switch output end is connected to the switch in-place signal input end of the controller, and the output end of the controller is communicatively connected to the control end of the transfer case through the solenoid valve module, for acquiring the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in-place signal, and controlling the transfer case and the drive module through the solenoid valve module according to the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in-place signal.

[0007] Optionally, the mode switch module includes a washing and sweeping mode switch, a cleaning mode switch, and a parking mode switch, and the washing and sweeping mode switch, the cleaning mode switch, and the parking mode switch are respectively communicatively connected to the switch signal input terminal of the controller.

[0008] Optionally, the driving module includes a fan, a motor, and a water pump, and the gear set on the transfer case is meshed and transmission-connected with the gear set of the fan, the gear set of the motor, and the gear set of the water pump respectively.

[0009] Furthermore, the solenoid valve module includes a fan solenoid valve, a motor solenoid valve, and a water pump solenoid valve. The control input end of the fan solenoid valve, the control input end of the motor solenoid valve, and the control input end of the water pump solenoid valve are respectively electrically connected to the control output end of the controller, and the control output end of the fan solenoid valve, the control output end of the motor solenoid valve, and the control output end of the water pump solenoid valve are respectively pneumatically connected to the control output end of the transfer case, and the control output end of the transfer case is respectively meshed and connected with the gear set of the fan, the gear set of the motor, and the gear set of the water pump through the gear set on the transfer case.

[0010] Furthermore, the fan solenoid valve, the motor solenoid valve and the water pump solenoid valve are all two-position three-way solenoid valves.

[0011] Optionally, the in-position signal switch module includes: a fan in-position signal switch, a motor in-position signal switch, a water pump in-position signal switch and a direct drive in-position signal switch; the fan in-position signal switch, the motor in-position signal switch, the water pump in-position signal switch and the direct drive in-position signal switch are all installed on the transfer case, and are used to monitor the meshing conditions of different gear sets corresponding to the fan, motor and water pump in the transfer case, and output the switch in-position signals to the controller respectively.

[0012] Optionally, the controller controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the gearbox speed acquisition module, and the switch in place signal:

[0013] After the controller receives the switch signal of the mode switch module and the clutch signal sent by the engine ECU respectively, the controller calculates the ratio of the speed information of the transmission acquisition module to the speed sent by the engine ECU. When the speed ratio of the speed sent by the engine ECU to the speed of the transmission acquisition module meets the preset conditions, and the switch in place signals on the transfer case are invalid, the controller controls the output solenoid valve module to work, so that the gear set on the transfer case drives the gear set of the drive module to engage.

[0014] Furthermore, it also includes:

[0015] When the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that the drive module reduces the speed of the gear set when following the gear set in the transfer case. When the speed is lower than the preset speed threshold, the gear meshing state inside the transfer case is opened to avoid high-speed gear knocking.

[0016] Optionally, it also includes:

[0017] When the mode switch module is turned on, if the controller does not receive a valid signal from the in-place signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage caused by circuit, air circuit or transfer case internal failure.

[0018] A second aspect of the present invention provides a transfer case control method for a driving hydraulic pump, which is implemented based on a transfer case control system for a driving hydraulic pump described in the first aspect of the present invention, and includes:

[0019] Obtain the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal;

[0020] According to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, the transfer case and the drive module are controlled through the solenoid valve module.

[0021] The technical solution adopted by the present invention includes the following technical effects:

[0022] 1. The controller of the present invention controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, effectively solving the problem of low reliability of transfer case control caused by the prior art and effectively improving the reliability of transfer case control.

[0023] 2. The technical solution of the present invention utilizes a controller in combination with various signals on the vehicle to monitor the vehicle status to meet the working requirements of the upper installation part and accurately control the transfer case, which can simplify the operator's operating steps and improve the transfer case control efficiency.

[0024] 3. In the technical solution of the present invention, when the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that when the drive module follows the gear set in the transfer case, the speed of the gear set is reduced. When the speed is lower than the preset speed threshold, the meshing state of the internal gears of the transfer case is opened, thereby avoiding the problem of tooth knocking caused by the heavy load during the meshing or exiting process of the gears in the transfer case, thereby improving the service life of the transfer case.

[0025] 4. In the technical solution of the present invention, when the mode switch module is turned on, if the controller does not receive a valid signal from the in-place signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage caused by internal faults in the circuit, air circuit or transfer case.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a system in Embodiment 1 of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the method of Example 2 in the scheme of the present invention.

[0030] Figure 1 Among them, 1. Washing and sweeping mode switch, 2. Cleaning mode switch, 3. Parking mode switch, 4. Engine ECU, 5. Transmission speed acquisition module, 6. Controller, 7. Fan solenoid valve, 8. Cylinder 1 port, 9. Cylinder 2 port, 10. Motor solenoid valve, 11. Cylinder 4 port, 12. Cylinder 3 port, 13. Water pump solenoid valve, 14. Cylinder 6 port, 15. Cylinder 5 port, 16. Transfer case, 17. Fan in place signal switch, 18. Motor in place signal switch, 19. Water pump in place signal switch, 20. Direct drive in place signal switch, 21. Fan, 22. Motor, 23. Water pump. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0032] Embodiment 1

[0033] like Figure 1 As shown, the present invention provides a transfer case control system for driving a hydraulic pump, comprising: a controller 6, a transmission speed acquisition module 5, a transfer case 16, an engine ECU 4, a mode switch module (not shown in the figure), a solenoid valve module (not shown in the figure), a drive module (not shown in the figure), and an in-place signal switch module (not shown in the figure). The speed output end of the transmission speed acquisition module 5 is communicatively connected to the speed input end of the controller 6, the clutch signal output end of the engine ECU 4 is communicatively connected to the clutch signal input end of the controller 6, the switch signal output end of the mode switch module is communicatively connected to the switch signal input end of the controller 6, the transfer case 16 is transmission-connected to the drive module, the in-place signal switch output end is connected to the switch in-place signal input end of the controller 6, and the output end of the controller 6 is communicatively connected to the control end of the transfer case 16 through the solenoid valve module, for acquiring the switch signal of the mode switch module, the clutch signal of the engine ECU 4, the speed information of the transmission speed acquisition module 5, and the switch in-place signal, and according to the switch signal of the mode switch module, the clutch signal of the engine ECU 4, the speed information of the transmission speed acquisition module 5, and the switch in-place signal, the transfer case 16 and the drive module are controlled through the solenoid valve module.

[0034] Among them, the mode switch module includes a washing and sweeping mode switch 1, a cleaning mode switch 2, and a parking mode switch 3. The washing and sweeping mode switch 1, the cleaning mode switch 2, and the parking mode switch 3 are connected in parallel and are respectively communicated with the switch signal input terminals of the controller 6.

[0035] The driving module includes a fan 21, a motor 22, and a water pump 23. The gear set on the transfer case 16 is meshed and connected with the gear set of the fan 21, the gear set of the motor 22, and the gear set of the water pump 23 respectively.

[0036] The solenoid valve module includes a fan solenoid valve 7, a motor solenoid valve 10, and a water pump solenoid valve 13. The control input end of the fan solenoid valve 7, the control input end of the motor solenoid valve 10, and the control input end of the water pump solenoid valve 13 are electrically connected to the control output end of the controller 6, respectively. The control output end of the fan solenoid valve 7, the control output end of the motor solenoid valve 10, and the control output end of the water pump solenoid valve 13 are pneumatically connected to the control output end of the transfer case 16, respectively. The control output end of the transfer case 16 is meshed and transmission-connected with the gear set of the fan 21, the gear set of the motor 22, and the gear set of the water pump 23 through the gear set on the transfer case.

[0037] Furthermore, the fan solenoid valve 7, the motor solenoid valve 10, and the water pump solenoid valve 13 are all two-position three-way solenoid valves. The controller 6 supports the receiving and sending functions of hard-wired signals and CAN bus signals. The controller 6 also needs to support the frequency pulse signal receiving function of the gearbox speed acquisition module 5. The gearbox speed acquisition module 5 can be implemented using a gearbox speed sensor, which is set on the engine gearbox output shaft and obtains the gearbox speed through a frequency pulse signal. Specifically, the frequency pulse signal is the controller receiving the output shaft speed of the gearbox by hard wire, which is a frequency square wave signal.

[0038] The fan solenoid valve 7, the motor solenoid valve 10, and the water pump solenoid valve 13 are driven by the circuit output by the controller 6. The circuit controls the on-off of the gas circuit, and the gas circuit is connected to the transfer case 16. The two-position three-way solenoid valve has three air vents, one air inlet P, and two air outlets (air outlet A and air outlet B). When the two-position three-way solenoid valve is not energized, the air inlet P is connected to the air outlet A, there is air in the air outlet A, and there is no air in the air outlet B. When the two-position three-way solenoid valve is energized, the air inlet P is connected to the air outlet B, there is no air in A, and there is air in B.

[0039] Specifically, when the fan solenoid valve 7, the motor solenoid valve 10 and the water pump solenoid valve 13 are all de-energized, there is air at the air outlet A on the solenoid valve, so that 6 bar compressed air is passed into the cylinder 2 port 9, the cylinder 3 port 12 and the cylinder 5 port 15 on the transfer case. At this time, the transfer case 16 is in a direct drive state.

[0040] When the fan solenoid valve 7 is energized, there is air at its air outlet B, so that 6 bar compressed air is passed into the cylinder 1 port 8 on the transfer case 16, and the gears of the transfer case 16 driving the fan 21 are meshed; when the motor solenoid valve 10 is energized, there is air at its air outlet B, so that 6 bar compressed air is passed into the cylinder 4 port 11 on the transfer case 16, and the gear set of the transfer case 16 driving the motor 22 is meshed; when the water pump solenoid valve 13 is energized, there is air at its air outlet B, so that 6 bar compressed air is passed into the cylinder 6 port 14 on the transfer case 16, and the gear set of the transfer case 16 driving the water pump 23 is meshed.

[0041] Furthermore, the in-position signal switch module includes: a fan in-position signal switch 17, a motor in-position signal switch 18, a water pump in-position signal switch 19 and a direct drive in-position signal switch 20; the fan in-position signal switch 17, the motor in-position signal switch 18, the water pump in-position signal switch 19 and the direct drive in-position signal switch 20 are all installed on the transfer case 16, and are used to monitor the meshing conditions of different gear sets corresponding to the fan 21, the motor 22 and the water pump 23 in the transfer case 16. If the gear sets are meshed in position, the corresponding switch in-position signals are output to the controller 6 respectively.

[0042] Preferably, the controller 6 is respectively connected to the vehicle chassis engine ECU 4 and the upper body controller in communication via CAN bus signals.

[0043] Specifically, the controller controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the gearbox speed acquisition module, and the switch in place signal:

[0044] After the controller receives the switch signal of the mode switch module and the clutch signal sent by the engine ECU respectively, the controller calculates the ratio of the speed information of the transmission acquisition module to the speed sent by the engine ECU. When the speed ratio of the speed sent by the engine ECU to the speed of the transmission acquisition module meets the preset conditions, and the switch in place signals on the transfer case are invalid, the controller controls the output solenoid valve module to work, so that the gear set on the transfer case drives the gear set of the drive module to engage.

[0045] Specifically, the fan solenoid valve 7, the motor solenoid valve 10 and the water pump solenoid valve 13 in the transfer case control system, when no power is supplied, the P port and the A port on the two-position three-way solenoid valve are connected, and there is air in the A port. At this time, the transfer case 16 is in direct drive mode, and the controller 6 receives a valid signal from the direct drive in place signal switch 20. The controller 6 converts the signal into a CAN message and sends it to the display, indicating that the upper system is not working.

[0046] The controller 6 receives the signal of the washing and sweeping mode switch 1 (supports both hard line and CAN message); when the controller 6 receives the clutch signal sent by the engine ECU4; the controller 6 calculates the ratio between the frequency pulse signal (speed information) sent by the transmission speed acquisition module 5 and the speed sent by the engine ECU4 in the form of a CAN message, when the speed ratio sent by the engine ECU4 / the speed ratio sent by the transmission speed acquisition module 5 meets 1.00 (±0.15); the fan in place signal switch 17, the motor in place signal switch 18, and the water pump in place signal switch 19 on the transfer case 16 are all invalid, when the above four conditions are met, the controller 6 outputs the electric drive fan 21 The fan magnetic valve 7, the motor solenoid valve 10 of the electric drive motor 22 and the water pump solenoid valve 13 of the electric drive water pump 23 are all working, the air inlet P of the fan magnetic valve 7, the motor solenoid valve 10 and the water pump solenoid valve 13 are connected to the air outlet B, and there is air at the air outlet B. At this time, the different gear sets on the transfer case 16 (the gear set corresponding to the fan 21, the gear set corresponding to the water pump 22 and the gear set corresponding to the motor 23) will drive the gear sets of the fan 21, the water pump 22 and the motor 23 to engage respectively. At this time, the corresponding fan in-place signal switch 17, the motor in-place signal switch 18 and the water pump in-place signal switch 19 all output valid signals to the controller 6, and the controller 6 converts the signals into CAN message form and sends them to the display.

[0047] The controller 6 receives the signal of the cleaning mode switch 2 (supports both hard-line and CAN message modes); similarly, when the controller 6 receives the clutch signal sent by the engine ECU 4; the controller 6 calculates the ratio of the frequency pulse signal (speed information) sent by the transmission speed acquisition module 5 and the speed sent by the engine ECU in the form of a CAN message. When the speed ratio sent by the engine ECU / the speed ratio sent by the transmission speed acquisition module meets 1.00 (±0.15), the fan in-place signal switch 17, the motor in-place signal switch 18, and the water pump in-place signal switch 19 on the transfer case 16 are all invalid, the above four When all conditions are met, the controller 6 outputs the fan solenoid valve 7 of the electrically driven fan 21 and the motor solenoid valve 10 of the electrically driven motor 22 to work, the air inlet P of the fan solenoid valve 7 and the motor solenoid valve 10 are connected to the air outlet B, there is air at the air outlet B, and the different gear sets on the transfer case 16 (the gear set corresponding to the fan 21 and the gear set corresponding to the motor 23) will drive the gear sets of the fan 21 and the motor 23 to engage respectively. At this time, the corresponding fan in-position signal switch 17 and the motor in-position signal switch 18 both output valid signals to the controller 6, and the controller 6 converts the signals into CAN message format and sends them to the display.

[0048] The controller 6 receives the signal of the parking mode switch 3 (supports both hard-line and CAN message modes). Similarly, when the controller 6 receives the clutch signal sent by the engine ECU 4; the controller 6 calculates the frequency pulse signal (speed information) sent by the transmission speed acquisition module 5 and the ratio of the speed sent by the engine ECU in the form of a CAN message. When the speed ratio sent by the engine ECU / the speed ratio sent by the transmission speed acquisition module satisfies 1.00 (±0.15), when all four conditions above are met, the controller 6 outputs the motor solenoid valve 10 of the electric drive motor 22 to work, and its air inlet P port is connected to the air outlet B port, and there is air at the air outlet B port. The gear set on the transfer case 16 (the gear set corresponding to the motor 23) will respectively engage the gear set driving the motor 23. At this time, the corresponding motor in place signal switch 18 outputs a valid signal to the controller 6, and the controller 6 converts the signal into a CAN message form and sends it to the display.

[0049] Furthermore, when the mode switch module is turned off, the controller 6 controls the solenoid valve module to delay power off, so that when the drive module follows the gear set in the transfer case 16, the gear set speed is reduced, and when the speed is lower than the preset speed threshold, the gear meshing state inside the transfer case 16 is opened to avoid high-speed gear knocking. Specifically, when the washing and sweeping mode switch 1 or the cleaning mode switch 2 is turned off, the controller 6 delays 10s power off to the water pump solenoid valve 13 that controls the water pump 23 and the motor solenoid valve 10 that controls the motor 22, respectively, so that when the fan 21 follows the gear in the transfer case 16, the gear set speed is reduced, and when the speed is low, the gear meshing state inside the transfer case 16 is opened to avoid high-speed gear knocking.

[0050] Furthermore, when the mode switch module is turned on, if the controller 6 does not receive a valid signal from the in-position signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage caused by circuit, gas circuit or internal fault of the transfer case. Specifically, when the washing and sweeping mode switch 1 or the cleaning mode switch 2 or the parking mode switch 3 is turned on, if the controller 6 does not receive a valid signal from the fan in-position signal switch 17, the motor in-position signal switch 18, the water pump in-position signal switch 19 and the direct drive in-position signal switch 20 in the corresponding mode within 3s, the controller 6 automatically exits the current mode to effectively avoid the risk of mechanical system damage caused by circuit, gas circuit or internal fault of the transfer case.

[0051] The present invention is mainly applicable to single-engine special-purpose washing and sweeping vehicles with National VI emission standards, and can also be extended to vehicles on which transfer cases are installed to achieve additional power take-off. The control application of the transfer case is realized by utilizing the method in the control system to transfer the power output by the engine to hydraulic pumps with different torque requirements. The transfer case and the hydraulic pump are combined by this control method, which can replace the original multiple engines on ordinary washing and sweeping vehicles, reduce energy consumption, and reduce emission pollution. The engine speed signal and the transmission speed signal on the chassis of the whole vehicle are obtained by the control system. After the control calculation and ratio analysis, when the signals of the two meet the set values ​​and the washing and sweeping mode signal is input to the controller, the controller outputs a control solenoid valve, and the solenoid valve controls the corresponding interface on the transfer case to be ventilated or de-vented through the air circuit, thereby making different gears of the transfer case mesh and outputting power to different hydraulic pumps, thereby realizing the control of the fan, motor, and water pump on the washing and sweeping vehicle.

[0052] The controller of the present invention controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, effectively solving the problem of low transfer case control reliability caused by the prior art and effectively improving the transfer case control reliability.

[0053] The technical solution of the present invention utilizes a controller in combination with various signals on the vehicle to monitor the vehicle status to meet the working requirements of the upper installation part and accurately control the transfer case, which can simplify the operator's operating steps and improve the transfer case control efficiency.

[0054] In the technical solution of the present invention, when the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that when the drive module follows the gear set in the transfer case, the speed of the gear set is reduced. When the speed is lower than the preset speed threshold, the meshing state of the gears inside the transfer case is opened, thereby avoiding the problem of tooth knocking caused by the heavy load carried during the meshing or exiting process of the gears in the transfer case, thereby improving the service life of the transfer case.

[0055] In the technical solution of the present invention, when the mode switch module is turned on, if the controller does not receive a valid signal from the in-place signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage caused by circuit, air circuit or transfer case internal failure.

[0056] Embodiment 2

[0057] like Figure 2 As shown, the technical solution of the present invention further provides a transfer case control method for driving a hydraulic pump, which is implemented based on a transfer case control system for driving a hydraulic pump in embodiment 1, and includes:

[0058] S1, obtaining the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal;

[0059] S2, according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, the transfer case and the drive module are controlled through the solenoid valve module.

[0060] Among them, in step S2, after the controller receives the switch signal of the mode switch module and the clutch signal sent by the engine ECU respectively, the controller calculates the ratio of the speed information of the transmission acquisition module to the speed sent by the engine ECU. When the speed ratio of the speed sent by the engine ECU to the speed of the transmission acquisition module meets the preset conditions, and the switch in place signals on the transfer case are invalid, the controller controls the output solenoid valve module to work, so that the gear set on the transfer case drives the gear set of the drive module to engage.

[0061] Specifically, the fan solenoid valve, motor solenoid valve and water pump solenoid valve in the transfer case control system, when there is no power, the P port and the A port on the two-position three-way solenoid valve are connected, and there is air in the A port. At this time, the transfer case is in direct drive mode, and the controller receives a valid signal from the direct drive in place signal switch. The controller converts the signal into a CAN message and sends it to the display, indicating that the upper system is not working.

[0062] The controller receives the signal of the cleaning mode switch (supports both hard-line and CAN message modes); when the controller receives the clutch signal sent by the engine ECU; the controller calculates the ratio between the frequency pulse signal (speed information) sent by the transmission speed acquisition module and the speed sent by the engine ECU in the form of a CAN message, when the speed ratio sent by the engine ECU / the speed ratio sent by the transmission speed acquisition module meets 1.00 (±0.15); the fan in-place signal switch, motor in-place signal switch, and water pump in-place signal switch on the transfer case are all invalid, if all the above four conditions are met, the controller The fan solenoid valve of the output electrically driven fan, the motor solenoid valve of the electrically driven motor and the water pump solenoid valve of the electrically driven water pump are all working, the air inlet P of the fan solenoid valve, the motor solenoid valve and the water pump solenoid valve are connected to the air outlet B, and there is air at the air outlet B. At this time, the different gear sets on the transfer case (the gear set corresponding to the fan, the gear set corresponding to the water pump and the gear set corresponding to the motor) will drive the gear sets of the fan, water pump and motor to engage respectively. At this time, the corresponding fan in-place signal switch, motor in-place signal switch and water pump in-place signal switch all output valid signals to the controller, and the controller converts the signals into CAN message format and sends them to the display.

[0063] The controller receives the signal of the cleaning mode switch (supports both hard-line and CAN message modes); similarly, when the controller receives the clutch signal sent by the engine ECU; the controller calculates the ratio of the frequency pulse signal (speed information) sent by the transmission speed acquisition module to the speed sent by the engine ECU in the form of a CAN message. When the speed ratio sent by the engine ECU / the speed ratio sent by the transmission speed acquisition module meets 1.00 (±0.15), the fan in-place signal switch, the motor in-place signal switch, and the water pump in-place signal switch on the transfer case are all invalid. When all of the above four conditions are met, the controller outputs the fan solenoid valve of the electrically driven fan and the motor solenoid valve of the electrically driven motor to work, the air inlet P of the fan solenoid valve and the air outlet B of the motor solenoid valve are connected, and there is air at the air outlet B. Different gear sets on the transfer case (the gear set corresponding to the fan and the gear set corresponding to the motor) will correspond to the gear sets driving the fan and the motor to engage respectively. At this time, the corresponding fan in-place signal switch and the motor in-place signal switch both output valid signals to the controller, and the controller converts the signals into CAN message form and sends them to the display.

[0064] The controller receives the signal of the parking mode switch (supports both hard-line and CAN message methods). Similarly, when the controller receives the clutch signal sent by the engine ECU; the controller calculates the frequency pulse signal (speed information) sent by the transmission speed acquisition module and the ratio of the speed sent by the engine ECU in the form of a CAN message. When the speed ratio sent by the engine ECU / the speed ratio sent by the transmission speed acquisition module meets 1.00 (±0.15), when all four conditions above are met, the motor solenoid valve of the controller output electric drive motor works, and its air inlet P port is connected to the air outlet B port, and there is air at the air outlet B port. The gear set on the transfer case (the gear set corresponding to the motor) will mesh with the corresponding gear set that drives the motor. At this time, the corresponding motor in place signal switch outputs a valid signal to the controller, and the controller converts the signal into a CAN message and sends it to the display.

[0065] Furthermore, when the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that when the drive module follows the gear set in the transfer case, the gear set speed is reduced, and when the speed is lower than the preset speed threshold, the gear meshing state inside the transfer case is opened to avoid high-speed gear knocking. Specifically, when the washing and sweeping mode switch or the cleaning mode switch is turned off, the controller delays 10s power off to the water pump solenoid valve that controls the water pump and the motor solenoid valve that controls the motor, respectively, so that when the fan follows the gear in the transfer case, the gear set speed is reduced, and when the speed is low, the gear meshing state inside the transfer case is opened to avoid high-speed gear knocking.

[0066] Furthermore, when the mode switch module is turned on, if the controller does not receive a valid signal from the in-position signal switch module, the controller will automatically exit the current mode to avoid the risk of mechanical system damage caused by circuit, gas circuit or transfer case internal faults. Specifically, when the washing and sweeping mode switch or the cleaning mode switch or the parking mode switch is turned on, if the controller does not receive a valid signal from the fan in-position signal switch, the motor in-position signal switch, the water pump in-position signal switch and the direct drive in-position signal switch in the corresponding mode within 3 seconds, the controller will automatically exit the current mode to effectively avoid the risk of mechanical system damage caused by circuit, gas circuit or transfer case internal faults.

[0067] The controller of the present invention controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, effectively solving the problem of low transfer case control reliability caused by the prior art and effectively improving the transfer case control reliability.

[0068] The technical solution of the present invention utilizes a controller in combination with various signals on the vehicle to monitor the vehicle status to meet the working requirements of the upper installation part and accurately control the transfer case, which can simplify the operator's operating steps and improve the transfer case control efficiency.

[0069] In the technical solution of the present invention, when the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that when the drive module follows the gear set in the transfer case, the speed of the gear set is reduced. When the speed is lower than the preset speed threshold, the meshing state of the gears inside the transfer case is opened, thereby avoiding the problem of tooth knocking caused by the heavy load carried during the meshing or exiting process of the gears in the transfer case, thereby improving the service life of the transfer case.

[0070] In the technical solution of the present invention, when the mode switch module is turned on, if the controller does not receive a valid signal from the in-place signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage caused by circuit, air circuit or transfer case internal failure.

[0071] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A transfer case control system for driving a hydraulic pump, characterized in that: include: A controller, a transmission speed acquisition module, a transfer case, an engine ECU, a mode switch module, a solenoid valve module, a drive module, and an in-position signal switch module, wherein the speed output end of the transmission speed acquisition module is communicatively connected to the speed input end of the controller, the clutch signal output end of the engine ECU is communicatively connected to the clutch signal input end of the controller, the switch signal output end of the mode switch module is communicatively connected to the switch signal input end of the controller, the transfer case is transmission-connected to the drive module, the in-position signal switch output end is connected to the switch in-position signal input end of the controller, and the output end of the controller is communicatively connected to the control end of the transfer case through the solenoid valve module, for acquiring the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in-position signal, and according to acquiring the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in-position signal, the transfer case and the drive module are controlled through the solenoid valve module.

2. A transfer case control system for driving a hydraulic pump according to claim 1, characterized in that: The mode switch module includes a washing and sweeping mode switch, a cleaning mode switch, and a parking mode switch. The washing and sweeping mode switch, the cleaning mode switch, and the parking mode switch are respectively communicatively connected to the switch signal input end of the controller.

3. A transfer case control system for driving a hydraulic pump according to claim 1, characterized in that: The driving module comprises a fan, a motor and a water pump, and the gear set on the transfer case is respectively meshed and connected with the gear set of the fan, the gear set of the motor and the gear set of the water pump.

4. A transfer case control system for driving a hydraulic pump according to claim 3, characterized in that: The solenoid valve module includes a fan solenoid valve, a motor solenoid valve, and a water pump solenoid valve. The control input end of the fan solenoid valve, the control input end of the motor solenoid valve, and the control input end of the water pump solenoid valve are electrically connected to the control output end of the controller respectively. The control output end of the fan solenoid valve, the control output end of the motor solenoid valve, and the control output end of the water pump solenoid valve are pneumatically connected to the control output end of the transfer case respectively. The control output end of the transfer case is meshed and transmission-connected with the gear set of the fan, the gear set of the motor, and the gear set of the water pump through the gear set on the transfer case.

5. A transfer case control system for driving a hydraulic pump according to claim 4, characterized in that: The fan solenoid valve, motor solenoid valve and water pump solenoid valve are all two-position three-way solenoid valves.

6. A transfer case control system for driving a hydraulic pump according to claim 3, characterized in that: The in-position signal switch module includes: a fan in-position signal switch, a motor in-position signal switch, a water pump in-position signal switch and a direct drive in-position signal switch; the fan in-position signal switch, the motor in-position signal switch, the water pump in-position signal switch and the direct drive in-position signal switch are all installed on the transfer case, and are used to monitor the meshing conditions of different gear sets corresponding to the fan, motor and water pump in the transfer case, and output the switch in-position signals to the controller respectively.

7. A transfer case control system for driving a hydraulic pump according to claim 1, characterized in that: The controller controls the transfer case and the drive module through the solenoid valve module according to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal. Specifically: After the controller receives the switch signal of the mode switch module and the clutch signal sent by the engine ECU respectively, the controller calculates the ratio of the speed information of the transmission acquisition module to the speed sent by the engine ECU. When the speed ratio of the speed sent by the engine ECU to the speed of the transmission acquisition module meets the preset conditions, and the switch in place signals on the transfer case are invalid, the controller controls the output solenoid valve module to work, so that the gear set on the transfer case drives the gear set of the drive module to engage.

8. A transfer case control system for driving a hydraulic pump according to claim 7, characterized in that: include: When the mode switch module is turned off, the controller controls the solenoid valve module to delay power off, so that the drive module reduces the speed of the gear set when following the gear set in the transfer case. When the speed is lower than the preset speed threshold, the gear meshing state inside the transfer case is opened to avoid high-speed gear knocking.

9. A transfer case control system for driving a hydraulic pump according to claim 7, characterized in that: include: When the mode switch module is turned on, if the controller does not receive a valid signal from the in-place signal switch module, the controller automatically exits the current mode to avoid the risk of mechanical system damage due to circuit, air circuit or transfer case internal failure.

10. A method for controlling a transfer case driving a hydraulic pump, characterized in that: The invention is realized on the basis of a transfer case control system for driving a hydraulic pump according to any one of claims 1 to 9, comprising: Obtain the switch signal of the mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal; According to the switch signal of the acquisition mode switch module, the clutch signal of the engine ECU, the speed information of the transmission speed acquisition module, and the switch in place signal, the transfer case and the drive module are controlled through the solenoid valve module.

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