CN114060506B

CN114060506B - Intelligent electric control pneumatic type transfer case operating mechanism and method

Info

Publication number: CN114060506B
Application number: CN202111276686.3A
Authority: CN
Inventors: 付邦璀; 汪振晓; 谢锡春; 李进伟; 李勇来
Original assignee: Dongfeng Off Road Vehicle Co Ltd
Current assignee: Dongfeng Off Road Vehicle Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2023-04-11
Anticipated expiration: 2041-10-29
Also published as: CN114060506A

Abstract

The invention discloses an intelligent electronic control pneumatic type transfer case operating mechanism and a method, wherein the mechanism comprises a piston cylinder, a gear ventilating unit arranged on the piston cylinder, a piston rod, a sensing unit arranged at one end of the piston rod, a shifting fork arranged on the piston rod and positioned between the piston cylinder and the sensing unit, and a synchronizer arranged on the shifting fork; the gear ventilation unit comprises a neutral gear ventilation port, a high gear ventilation port, a low gear ventilation port and a piston unit, wherein the neutral gear ventilation port and the high gear ventilation port are arranged on the side surface of the piston cylinder; the piston unit comprises a neutral gear piston, a high gear piston and a low gear piston which are arranged on the piston rod; the sensing unit comprises position sensors which are arranged on the piston rod and are respectively used for controlling a high gear and a low gear; the tail end of the piston rod is provided with a groove the depth and length of which are determined according to the contact travel of the position sensor for controlling the high gear and the low gear; the piston rod moves left and right to trigger the position sensor and the groove to be closed or opened, and synchronous switching of different gears is achieved.

Description

Intelligent electric control pneumatic type transfer case operating mechanism and method

Technical Field

The invention belongs to the technical field of transfer case gear control, and particularly relates to an intelligent electric control pneumatic type transfer case operating mechanism and method.

Background

The transfer case is a device for distributing power of the engine, and can output the power to the rear axle or to both the front and rear axles. From this perspective, it can be seen that the transfer case is actually a fitting on a four-wheel drive vehicle.

The main function of the transfer case is to reasonably distribute the power transmitted by the gearbox to the front axle and the rear axle, and the other function of the transfer case can be used as a gearbox auxiliary case to arrange two gears, so that the transmission ratio and the gear number of a transmission system are increased, and the dynamic property and the economical efficiency of the whole vehicle are improved. However, because the input end of the transfer case is connected with the gearbox, and the output end of the transfer case is connected with the transmission shaft, the drive axle, the wheels and other systems, the rotational inertia at both ends is large, and the traditional synchronizer can not meet the requirements and can not realize the requirement of synchronous gear switching. Traditional operating system can only park and realize the switching that the high-low fender position was realized in the hard combination through combining the tooth, seriously influences the driving experience, and the reliability of shifting is also relatively poor.

Therefore, an intelligent transfer case operating device which can realize the fast switching of the high gear and the low gear of the transfer case when the vehicle normally runs, improve the dynamic property of the vehicle and improve the driving experience is urgently needed.

Disclosure of Invention

Aiming at the defects or the improvement requirements of the prior art, the invention provides an intelligent electric control pneumatic type transfer case control mechanism and a control method, the rotation speed of the high-gear and low-gear driving ends of the transfer case is adjusted by controlling the rotation speed of an engine through a transfer case controller, the neutral gear, low-gear or high-gear high-speed electromagnetic valve of the transfer case is controlled to act through the transfer case controller by installing a corresponding control mechanism, compressed air is further controlled to enter a piston cylinder from a neutral gear vent, a low-gear vent or a high-gear vent, the low-gear piston or the high-gear piston is respectively pushed to move through the compressed air, the piston rod is further pushed to move, the contact opening and closing states of a high-gear position sensor and a low-gear position sensor are further controlled, and the synchronous switching of different gears in the driving process is further realized. The operation process of the transfer case control mechanism is accurately controlled through the transfer case controller, the rotating speeds of the high gear and the low gear driven ends of the transfer case are adjusted through ABS control, and the rotating speeds of the high gear and the low gear driving ends of the transfer case are adjusted through engine control, so that the high gear and the low gear of the transfer case are quickly switched when the vehicle normally runs, the dynamic property of the vehicle is improved, and the driving experience is improved; the key point of the invention is that the high-low gear switching of the transfer case is realized under the driving condition through the coordinated control of the operation of the ABS, the engine, the gearbox and the transfer case, and the problems that the traditional operation system can only stop and realize the hard combination through the combination teeth to realize the high-low gear switching, the driving experience is seriously influenced, and the gear shifting reliability is poor are solved.

In order to achieve the above purpose, one aspect of the present invention provides an intelligent electronically controlled pneumatic transfer case operating mechanism, which is mounted on a transfer case, and includes a piston cylinder with an open end, a gear ventilating unit arranged on the piston cylinder, a piston rod with an open end arranged in the piston cylinder, a sensing unit arranged at one end of the piston rod far away from the piston cylinder, a shifting fork arranged on the piston rod and between the piston cylinder and the sensing unit, and a synchronizer arranged on the shifting fork; wherein the content of the first and second substances,

the gear ventilation unit comprises a neutral gear ventilation opening and a high gear ventilation opening which are arranged on the side surface of the piston cylinder at intervals, a low gear ventilation opening which is arranged on the piston cylinder and is far away from the opening end of the piston cylinder, and a piston unit which is arranged in the piston cylinder; the neutral gear air vent, the high gear air vent and the low gear air vent are respectively communicated with a neutral gear high-speed electromagnetic valve, a high gear high-speed electromagnetic valve and a low gear high-speed electromagnetic valve on the transfer case controller; the piston unit comprises a neutral gear piston and a high gear piston which are arranged on the side wall of the piston rod, and a low gear piston which is arranged on the neutral gear piston;

the sensing unit comprises a sensor supporting seat arranged at one end of the piston rod, which is far away from the piston cylinder, a first position sensor which is arranged on the sensor supporting seat at intervals and used for controlling a high gear and a second position sensor which is arranged on the sensor supporting seat and used for controlling a low gear;

the tail end of the piston rod is provided with a groove, and the depth and the length of the groove are determined according to the contact travel of a first position sensor for controlling a high gear and a second position sensor for controlling a low gear, which are arranged on a sensor supporting seat; the first position sensor, the second position sensor and the groove are triggered to be closed or opened through the left and right movement of the piston rod, corresponding information is sent to the transfer case controller, and then synchronous switching of different gears is achieved.

Further, the opening of the opening end of the piston cylinder is just provided for the piston rod to pass through;

the neutral gear piston and the high gear piston are axially fixed with the piston rod; one side of the high-gear piston is axially fixed with the piston rod, and the other side of the high-gear piston is fixed with the inner wall of the piston cylinder;

the piston rod can be driven to move left and right by the left and right movement of either the neutral gear piston or the high gear piston.

Furthermore, the high-gear piston is arranged at one end of the neutral-gear piston far away from the low-gear vent hole,

the neutral gear piston is provided with an L-shaped notch, and the L-shaped notch faces the high gear piston; the cross section of the low-gear piston is Z-shaped with two vertical ends;

one end of the low-gear piston is arranged at the L-shaped notch of the neutral-gear piston, and the low-gear piston can slide along the axial direction of the neutral-gear piston;

and a gap is formed between the low-gear piston and the high-gear piston when one end of the low-gear piston is in hooking and clamping with one end of the neutral-gear piston.

Furthermore, three cavities which are rectangular in cross section and are communicated with each other are sequentially and horizontally arranged in the piston cylinder along the direction of the central axis of the piston rod, and the three cavities are respectively a first cavity, a second cavity and a third cavity;

the first cavity is positioned at one end, close to the low-gear vent, in the piston cylinder;

the opening of the third cavity can be just penetrated by the piston rod, and the piston rod passes through the third cavity and then sequentially extends into the second cavity and the first cavity;

the cross-sectional areas and the volumes of the first cavity, the second cavity and the third cavity are sequentially reduced, and continuous steps are formed at the connecting positions of the first cavity, the second cavity and the third cavity;

the joint of the first cavity and the second cavity forms a first step on the inner wall of the piston cylinder, the joint of the second cavity and the third cavity forms a second step on the inner wall of the piston cylinder, and the vertical wall of the first step is a first right wall of the piston cylinder; the vertical wall of the second step is a second right wall of the piston cylinder.

Further, when one end of the low-gear piston slides along the inner wall of the first cavity, the other end of the low-gear piston slides along the inner wall of the second cavity;

when the piston rod moves left and right, the high-gear piston slides along the inner wall of the second cavity;

and when the left end of the low-gear piston abuts against the left wall of the piston cylinder, the right end of the low-gear piston is connected with the inner wall of the second cavity.

Furthermore, when the piston rod slides left and right in the piston cylinder, the piston rod also slides left and right in the sensor supporting seat;

one end of the shifting fork is fixedly arranged at the middle section of the piston rod;

the synchronizer is fixedly arranged at the other end of the shifting fork and used for enabling the rotating speed of the normally meshed gear and the rotating speed of the target gear to be synchronous.

Furthermore, the first position sensor and the second position sensor are respectively provided with a contact switch for controlling the opening and closing of the sensors;

the contact switch on the first position sensor and the second position sensor is in a free state when the contact switch is positioned in the groove and is in a compressed state when the contact switch is separated from the groove.

Further, when the low-gear piston leans against the left wall of the piston cylinder, the piston rod triggers the first position sensor and the second position sensor to be disconnected simultaneously;

when the high gear piston moves left until the high gear piston is attached to the right end of the low gear piston, the synchronous piston rod moves left to trigger the first position sensor to be closed, and high gear combination is completed;

when the high-gear piston leans against the second right wall of the piston cylinder, the piston rod triggers the first position sensor and the second position sensor for controlling the low gear to be simultaneously disconnected, and the neutral gear is completed in place;

the second position sensor is closed when the low range piston pushes the piston rod to move rightward until the low range piston abuts against the first right wall of the piston cylinder.

Furthermore, a radial sealing ring is arranged at the contact position of the low-gear piston and the neutral-gear piston, and a radial sealing ring is also arranged between the low-gear piston and the piston cylinder.

The invention also provides an intelligent electric control pneumatic type transfer case operation method, which comprises the following steps:

s100: the vehicle whole vehicle controller identifies the road surface state, when the vehicle needs to switch the high gear, the whole vehicle controller sends a high gear switching request to the transfer case controller, the transfer case receives the gear switching request and then sends a transfer case neutral gear returning request to the whole vehicle controller, and the whole vehicle controller receives the transfer case neutral gear returning instruction and then sends an engine torque reducing instruction to the engine controller;

s200: after the engine adjusts the torque output, the torque adjusting information is fed back to a vehicle control unit, the vehicle control unit sends the engine torque information to a transfer case controller, the transfer case controller judges that the rotating speed of a driving end and a driven end of a low-gear input gear is less than or equal to 5rpm, and the transfer case controller controls a neutral gear high-speed electromagnetic valve to act;

s300: compressed air enters a neutral gear cavity of the piston cylinder from the neutral gear vent hole, extrudes the low gear piston and pushes the piston rod to move leftwards until the low gear piston leans against the left wall of the piston cylinder, neutral gear withdrawing action is completed, meanwhile, the piston rod triggers a first position sensor for controlling high gear and a second position sensor for controlling low gear to be disconnected simultaneously, and after receiving disconnection signals of the two position sensors, the transfer case controller determines that the neutral gear is in place;

s400: the transfer case controller sends the emptying information in the step S300 to a vehicle control unit, the vehicle control unit converts the transfer case upshift instruction received in the step S100 into an upshift instruction and sends the upshift instruction to an engine controller, the vehicle control unit sends engine speed regulation information in a reverse direction deaf to the transfer case controller, meanwhile, the transfer case controller judges that the rotating speeds of a driving end and a driven end of a high-gear input gear are less than or equal to 5rpm, the high-gear high-speed electromagnetic valve is controlled to act, a corresponding gas circuit enters a piston cylinder through a high-gear vent hole, a high-gear piston is pushed to move left until the piston is attached to a low-gear piston, a synchronous piston rod moves left to trigger a first position sensor controlling the high gear to be closed, and the high gear is combined;

s500: when the vehicle needs to switch low gears, the whole vehicle controller sends a low gear switching request to the transfer case controller, the transfer case receives the gear shifting request and then sends a transfer case neutral gear returning request to the whole vehicle controller, and the whole vehicle controller receives the transfer case neutral gear returning instruction and then sends an engine torque reducing instruction to the engine controller;

s600: after the torque output of the engine is adjusted, torque adjusting information is fed back to a vehicle control unit, the vehicle control unit sends the engine torque information to a transfer case controller, meanwhile, the transfer case controller judges that the rotating speed of a driving end and a driven end of a low-gear input gear is less than or equal to 5rpm, the transfer case controller controls a neutral high-speed electromagnetic valve to act, compressed air enters a neutral cavity of a piston cylinder from a neutral vent, a high-gear piston pushes a piston rod to move rightwards at the moment until the high-gear piston leans against the right wall of the piston cylinder to complete neutral-gear withdrawing action, the piston rod triggers a first position sensor for controlling the high gear and a second position sensor for controlling the low gear to be simultaneously disconnected, and the transfer case controller determines that the neutral gear is in place after receiving signals for disconnecting the two position sensors;

s700: the transfer case controller sends the return air information to the vehicle control unit, the vehicle control unit sends an engine speed reduction request to the engine controller, and the engine controller controls the engine speed reduction; the whole vehicle controller sends a vehicle speed reduction request to the ABS controller, controls the ABS system to work, pressurizes a wheel end braking system, reduces the whole vehicle speed, simultaneously, the transfer case controller judges the rotating speeds of a driving end and a driven end of the low-gear input gear, and feeds back the condition that the rotating speed difference between the driving end and the driven end is less than or equal to 5rpm to the whole vehicle controller until the rotating speeds of the driving end and the driven end of the gear are less than or equal to 5rpm;

s800: the transfer case controller controls the low-gear high-speed electromagnetic valve to act, compressed air enters a piston cylinder neutral cavity from a low-gear vent, the low-gear piston pushes the piston rod to move rightwards at the moment until the low-gear piston leans against the left wall of the piston cylinder to complete low-gear switching action, the second position sensor of the low gear is controlled to be closed at the moment, and the transfer case controller determines that the gears are in place after receiving a signal of closing the low-gear position sensor.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

the invention relates to an intelligent electric control pneumatic type transfer case operating mechanism and method, which realize the adjustment of the rotating speed of a high-gear and a low-gear driving end of a transfer case by controlling the rotating speed of an engine through a transfer case controller. The operation process of the transfer case control mechanism is accurately controlled through the transfer case controller, the rotating speeds of the high, low and neutral driven ends of the transfer case are adjusted through ABS control, and the rotating speeds of the high, low and neutral driving ends of the transfer case are adjusted through control over the rotating speed and torque of an engine, so that the high and low gears of the transfer case are rapidly switched when the vehicle normally runs, the dynamic property of the vehicle is improved, and the driving experience is improved; the problem of traditional control system can only park and realize the switching that the high-low grade kept off the position through combining the tooth and realizing the hard bonding, seriously influence the driving and experience, shift the poor reliability is solved.

Drawings

FIG. 1 is a schematic diagram of a schematic structure of a vehicle control system;

FIG. 2 is a schematic cross-sectional structure view of an intelligent electro-pneumatic transfer case operating mechanism according to an embodiment of the invention;

fig. 3 is a flowchart of an operating method of the intelligent electro-pneumatic transfer case (when the high gear is switched) according to the embodiment of the invention;

fig. 4 is a flowchart of an operating method of the intelligent electro-pneumatic transfer case (during low gear shifting) according to an embodiment of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: the automatic transmission control system comprises a 1-vehicle controller, a 2-ABS controller, a 3-engine controller, a 4-automatic gearbox controller, a 5-transfer case controller, a 6-piston cylinder, a 61-gear ventilation unit, a 611-neutral gear air vent, a 612-high gear air vent, a 613-low gear air vent, a 614-neutral gear piston, a 615-high gear piston, a 616-low gear piston, a 7-piston rod, an 8-shifting fork, an 81-synchronizer, a 9-sensing unit, a 91-sensor supporting seat, a 92-first position sensor and a 93-second position sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, when an element is referred to as being "fixed to", "disposed on" or "disposed on" another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element; the terms "mounted," "connected," and "provided" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 1 and 2, the whole vehicle control system of the four-wheel drive vehicle comprises a whole vehicle controller 1, an ABS controller 2 connected with the whole vehicle controller 1, an engine controller 3, an automatic transmission controller 4 and a transfer case controller 5; the vehicle controller, namely the power assembly controller, is a core control component of the whole vehicle and is used for realizing the functions of vehicle driving control, energy optimization control, brake feedback control, network management and the like. The ABS controller, i.e. an Anti-lock braking system, i.e. a pneumatic ABS (Anti-lock braking system), detects the rotational speed of the wheel through a wheel speed sensor, and when the wheel has a slip/lock tendency or phenomenon, is used to ensure that the driver can perform effective emergency avoidance operation and reduce the emergency braking distance under most road conditions. The engine controller is a special microcomputer controller for the automobile; the automatic gearbox controller is used for realizing automatic speed change control of the vehicle, so that driving is simpler; the transfer case is a device for distributing the power of the engine and is mainly used for reasonably distributing the power transmitted by the gearbox to the front axle and the rear axle; the transfer case controller is used for controlling gear switching of the transfer case.

As shown in fig. 1-4, the intelligent electrically-controlled pneumatic transfer case operating mechanism provided by the invention is mounted on a transfer case, and is used for accurately controlling the operating process of the transfer case so as to realize gear switching of a vehicle during traveling, and comprises a piston cylinder 6 with an open end, a gear ventilating unit 61 arranged on the piston cylinder 6, a piston rod 7 with an open end arranged in the piston cylinder 6, a sensing unit 9 arranged at one end of the piston rod 7 far away from the piston cylinder 6, a shifting fork 8 arranged on the piston rod 7 and between the piston cylinder 6 and the sensing unit 9, and a synchronizer 81 arranged on the shifting fork 8; according to the invention, the rotating speeds of the high gear and the low gear of the transfer case are adjusted by controlling the rotating speed of the engine through the transfer case controller, the corresponding operating mechanism is installed on the transfer case, the operating process of the operating mechanism of the transfer case is accurately controlled through the transfer case controller, the rotating speeds of the high gear and the low gear of the transfer case are adjusted through controlling the ABS, the rotating speeds of the high gear, the low gear and the neutral gear of the transfer case are adjusted through controlling the engine, and therefore the high gear, the low gear and the neutral gear of the transfer case are quickly switched when the vehicle normally runs, the dynamic property of the vehicle is improved, and the driving experience is improved; the problem of traditional control system can only park and realize the switching that the high-low grade kept off the position through combining the tooth and realizing the hard bonding, seriously influence the driving and experience, shift the poor reliability is solved.

Further, as shown in fig. 1 and fig. 2, the gear vent unit 61 includes a neutral vent 611 and a high vent 612 which are arranged on the side surface of the piston cylinder 6 at intervals, a low vent 613 arranged at an end of the piston cylinder 6 away from the opening thereof, and a piston unit arranged inside the piston cylinder 6; the piston unit comprises a neutral piston 614 and a high piston 615 which are arranged on the side wall of the piston rod 7, and a low piston 616 which is arranged on the neutral piston 614; the neutral piston 614 and the high-gear piston 615 are both axially fixed to the piston rod 7 through nuts, and the piston rod 7 can be driven to move left and right by the left-and-right movement of either the neutral piston 614 or the high-gear piston 615; the section of the high-gear piston 615 is rectangular, the high-gear piston 615 is arranged at one end, away from the low-gear vent 613, of the neutral piston 614, an L-shaped notch is formed in the neutral piston 614, the section of the neutral piston 614 is also L-shaped, and the inner wall of the neutral piston 614 is tightly sleeved on the piston rod 7; the cross section of the low-gear piston 616 is zigzag with two perpendicular ends, and when the low-gear piston 616 is installed, the low-gear piston 616 is horizontally placed, one end of the low-gear piston 616 is disposed at the L-shaped notch of the neutral piston 614, the low-gear piston 616 can axially slide along the neutral piston 614 (along the central axis direction of the piston rod), and when one end of the low-gear piston 616 is in hooking engagement with one end of the neutral piston 614, a gap is formed between the low-gear piston 616 and the high-gear piston 615; a radial O-ring is disposed at a contact position between the low-range piston 616 and the neutral-range piston 614, and a radial O-ring is disposed between the low-range piston 616 and the piston cylinder 6, both for achieving radial sealing.

Further, as shown in fig. 2, the opening of the piston cylinder 6 is just large enough for the piston rod 7 to pass through; three cavities which are rectangular in cross section and are communicated with each other are sequentially and horizontally arranged in the piston cylinder 6 along the central axis direction of the piston rod 7, the cavities are respectively a first cavity, a second cavity and a third cavity, the first cavity is positioned at one end, close to the low-gear vent port 613, in the piston cylinder 6, a port of the third cavity can be just penetrated by the piston rod 7, and the piston rod 7 sequentially extends into the second cavity and the first cavity after passing through the third cavity; the cross-sectional areas and the volumes of the first cavity, the second cavity and the third cavity are sequentially reduced, and continuous steps are formed at the connecting positions of the first cavity, the second cavity and the third cavity; the joint of the first cavity and the second cavity forms a first step on the inner wall of the piston cylinder 6; the joint of the second cavity and the third cavity forms a second step on the inner wall of the piston cylinder 6; the vertical wall of the first step is a first right wall of the piston cylinder 6; the vertical wall of the second step is the second right wall of the piston cylinder 6.

Further, as shown in fig. 2, when one end of the low piston 616 slides along the inner wall of the first cavity, the other end slides along the inner wall of the second cavity; when the piston rod 7 moves left and right, the high-gear piston 615 slides along the inner wall of the second cavity; when the left end of the low-gear piston 616 abuts against the left wall of the piston cylinder 6, the right end of the low-gear piston 616 is connected with the inner wall of the second cavity; one side of the high-gear piston 615 is axially fixed with the piston rod 7, and the other side of the high-gear piston is fixed with the inner wall of the piston cylinder 6; the neutral vent 611, the high vent 612 and the low vent 613 are respectively communicated with a neutral high-speed solenoid valve, a high-speed solenoid valve and a low-speed solenoid valve on the transfer case controller.

Further, as shown in fig. 2, the sensing unit 9 includes a sensor support seat 91 disposed on one end of the piston rod 7 away from the piston cylinder 6, and a first position sensor 92 and a second position sensor 93 spaced apart from the sensor support seat 91 for controlling a high gear; a triangular notch for controlling the opening and closing of the second position sensor 93 is arranged at the end part, far away from the piston cylinder 6, of the piston rod 7, and a trapezoidal notch for controlling the opening and closing of the first position sensor 92 is arranged at the position close to the triangular notch at the end part; when the piston rod 7 slides left and right in the piston cylinder 6, the piston rod also slides left and right in the sensor supporting seat 91; the other end of the piston rod 7 is supported by a sensor supporting seat 91, and one end of the shifting fork 8 is fixedly arranged at the middle section of the piston rod 7 through two screws; the other end of the shifting fork 8 is fixedly provided with a synchronizer through a round pin, and the synchronizer is used for synchronizing the rotating speed of the normally meshed gear and the rotating speed of the target gear; the tail end of the piston rod 7 is provided with a groove, the depth and the length of the groove are determined according to contact strokes of a first position sensor 92 and a low-gear position sensor 11 which are arranged on a sensor supporting seat 91 and used for controlling a high gear, contact switches of the two sensors are push type switches, when the contacts are compressed to a certain stroke, the sensors are conducted, and when the contacts are in a free state, the sensors are disconnected; the depth of the recess is determined by the travel of the contact to ensure that the contact is free when located in the recess and compressed when removed from the recess. The first position sensor 92 and the second position sensor 93 are triggered to be closed or disconnected with the trapezoidal notch or the triangular notch by the left and right movement of the piston rod 7, corresponding information is sent to the transfer case controller, and then synchronous switching of different gears is achieved.

Further, as shown in fig. 2, when compressed air enters the cylinder neutral cavity from the neutral vent 611, so that the low-gear piston 616 pushes the piston rod to move leftward until the low-gear piston 616 leans against the left wall of the piston cylinder to complete the neutral-gear-removing action, the piston rod 7 triggers the first position sensor 92 for controlling the high gear and the second position sensor 93 for controlling the low gear to be simultaneously disconnected, and the neutral position is completed; when the gas path enters the cylinder through the high gear vent 612, the piston 6 is pushed to move left until the gas path is attached to the right end of the low gear piston 616, the synchronous piston rod 7 moves left to trigger the first position sensor 92 for controlling the high gear to be closed, and the high gear combination is completed; when the high-gear piston 615 leans against the second right wall of the piston cylinder, the piston rod 7 triggers the first position sensor 92 for controlling the high gear and the second position sensor 93 for controlling the low gear to be simultaneously disconnected, and the neutral gear is completed; when compressed air enters the cylinder neutral cavity from the low gear vent port 613, the low gear piston 616 pushes the piston rod 7 to move rightward until the low gear piston 616 leans against the first right wall of the piston cylinder to complete the low gear switching action, the second position sensor 93 for controlling the low gear is closed, and the transfer case controller determines that the low gear is in place after receiving a signal of closing the low gear position sensor.

As shown in fig. 3 and 4, another aspect of the present invention provides a method for operating an intelligent electro-pneumatic transfer case, including the steps of:

s100: the vehicle whole vehicle controller identifies the road surface state, when the vehicle needs to switch the high gear, the whole vehicle controller sends a high gear switching request to the transfer case controller, the transfer case receives the gear switching request and then sends a transfer case neutral gear returning request to the whole vehicle controller, and the whole vehicle controller receives the transfer case neutral gear returning instruction and then sends an engine torque reducing instruction to the engine controller ECU;

s200: after the engine adjusts the torque output, the torque adjusting information is fed back to the whole vehicle controller, the whole vehicle controller sends the engine torque information to the transfer case controller, the transfer case controller judges that the rotating speeds of the driving end and the driven end of the low-gear input gear are less than or equal to 5rpm, and the transfer case controller controls the neutral high-speed electromagnetic valve to act;

s300: compressed air enters the cylinder neutral cavity from the neutral vent 611, at the moment, the low-gear piston 616 pushes the piston rod to move leftwards until the low-gear piston 616 leans against the left wall of the piston cylinder, the neutral-gear withdrawing action is completed, at the moment, the piston rod 7 triggers the first position sensor 92 for controlling the high gear and the second position sensor 93 for controlling the low gear to be disconnected simultaneously, and after receiving the disconnection signals of the two position sensors, the transfer case controller determines that the neutral gear is in place;

s400: the transfer case controller sends the return-to-air information in the step S300 to a vehicle control unit, the vehicle control unit converts the transfer case upshift instruction received in the step S100 into an upshift instruction and sends the upshift instruction to an engine controller, the vehicle control unit sends engine speed regulation information in a reverse direction of deaf to the transfer case controller, meanwhile, the transfer case controller judges that the rotating speeds of the driving end and the driven end of the high-gear input gear are less than or equal to 5rpm, the high-gear high-speed electromagnetic valve is controlled to act, a corresponding air passage enters the air cylinder through a high-gear air vent 612, the high-gear piston 615 is pushed to move left until the high-gear piston is attached to a low-gear piston 616, the synchronous piston rod moves left to trigger a first position sensor 92 for controlling the high gear to be closed, and the high gear is combined.

S500: when the vehicle needs to switch low gears, the whole vehicle controller sends a low gear switching request to the transfer case controller, the transfer case sends a transfer case neutral gear returning request to the whole vehicle controller after receiving the gear shifting request, and the whole vehicle controller sends an engine torque reducing instruction to the engine controller after receiving the transfer case neutral gear returning instruction.

S600: after the engine adjusts torque output, torque adjusting information is fed back to a vehicle control unit, the vehicle control unit sends the engine torque information to a transfer case controller, meanwhile, the transfer case controller judges that the rotating speed of a driving end and a driven end of a low-gear input gear is less than or equal to 5rpm, the transfer case controller controls a neutral gear high-speed electromagnetic valve to act, compressed air enters a cylinder neutral gear cavity from a neutral gear air port 611, a high-gear piston 615 pushes a piston rod to move rightwards until the high-gear piston leans against the right wall of a cylinder, neutral gear returning action is completed, the piston rod triggers a first position sensor 92 for controlling the high gear and a second position sensor 93 for controlling the low gear to be simultaneously disconnected, and the transfer case controller determines that the neutral gear is in place after receiving signals of disconnection of the two position sensors;

s800: the transfer case controller controls the low-gear high-speed electromagnetic valve to act, compressed air enters the cylinder neutral cavity from the low-gear vent port 613, the low-gear piston 616 pushes the piston rod to move rightwards at the moment until the low-gear piston leans against the left wall of the piston cylinder to complete low-gear switching action, the second position sensor 93 for controlling low gear is closed at the moment, and the transfer case controller determines that the gears are in place after receiving a signal of closing the low-gear position sensor.

The invention relates to a working principle of an intelligent electric control pneumatic transfer case operating mechanism, which comprises the following components: the whole vehicle controller sends a gear shifting request to the transfer case controller, the transfer case controller sends a gear shifting request to the transfer case, the transfer case receives the gear shifting request, the whole vehicle controller sends a transfer case neutral gear returning request, the whole vehicle controller receives the transfer case neutral gear returning instruction, sends an engine torque reducing instruction to the engine controller, then the engine adjusts the torque output, and feeds back the torque adjusting information to the whole vehicle controller, the whole vehicle controller sends the engine torque information to the transfer case controller, meanwhile, the transfer case controller judges whether the main and passive end rotating speeds of the neutral, low or high gear input gears are less than or equal to 5rpm, the transfer case controller controls the neutral, low or high gear high speed electromagnetic valve to act, compressed air enters the piston cylinder 6 from the neutral vent port 611, the low gear vent port 613 or the high gear vent port 612, and further pushes the piston rod 7 to move by pushing the low gear piston 616 or the high gear piston 615 respectively, so as to control the open and close states of the first position sensor 92 for controlling the high gear and the second position sensor 93 for controlling the low gear, and further realize the synchronous switching of the driving in different gears in the process.

According to the invention, the rotating speeds of the high and low gears of the transfer case are adjusted by controlling the rotating speed of the engine through the transfer case controller, the corresponding operating mechanism is installed on the transfer case, the operating process of the operating mechanism of the transfer case is accurately controlled through the transfer case controller, the rotating speeds of the high, low and neutral driven ends of the transfer case are adjusted through controlling the ABS, the rotating speeds of the high and low gears of the transfer case are adjusted through controlling the engine, and therefore the high and low gears of the transfer case are quickly switched when the vehicle normally runs, the dynamic property of the vehicle is improved, and the driving experience is improved; the problem of traditional control system can only park and realize the switching that the high-low grade kept off the position through combining the tooth and realizing the hard bonding, seriously influence the driving and experience, shift the poor reliability is solved.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An intelligent electric control pneumatic type transfer case operation method is characterized by comprising the following steps:

s100: the vehicle control unit identifies the road surface state, when the vehicle needs to switch the high gear, the control unit sends a request for switching the high gear to the transfer case controller, the transfer case receives the shift request and then sends a request for returning the neutral gear of the transfer case to the control unit, and the control unit receives a command for returning the neutral gear of the transfer case and then sends a command for reducing the torque of the engine to the engine controller;

s300: compressed air enters a neutral gear cavity of a piston cylinder from a neutral gear vent hole (611), a low gear piston (616) is extruded and a piston rod (7) is pushed to move leftwards until the low gear piston (616) leans against the left wall of the piston cylinder, neutral gear withdrawing action is completed, meanwhile, the piston rod (7) triggers a first position sensor (92) for controlling high gear and a second position sensor (93) for controlling low gear to be disconnected simultaneously, and a transfer case controller determines that neutral gear is in place after receiving signals of disconnection of the two position sensors;

s400: the transfer case controller sends the emptying information in the step S300 to a vehicle control unit, the vehicle control unit converts the transfer case upshifting instruction received in the step S100 into an upshifting instruction and sends the upshifting instruction to an engine controller, the vehicle control unit sends engine speed regulation information in a reverse direction deaf to the transfer case controller, meanwhile, the transfer case controller judges that the rotating speeds of a driving end and a driven end of a high-gear input gear are less than or equal to 5rpm, a high-gear high-speed electromagnetic valve is controlled to act, a corresponding gas circuit enters a piston cylinder through a high-gear vent hole (612), a high-gear piston (615) is pushed to move left until the high-gear piston (616) is attached to a low-gear piston, the synchronous piston rod moves left to trigger a first position sensor (92) for controlling the high gear to be closed, and the high gear is combined;

s600: after the torque of an engine is adjusted and output, the torque adjusting information is fed back to a vehicle control unit, the vehicle control unit sends the torque information of the engine to a transfer case controller, meanwhile, the transfer case controller judges that the rotating speed of a driving end and a driven end of a low-gear input gear is less than or equal to 5rpm, the transfer case controller controls a neutral high-speed electromagnetic valve to act, compressed air enters a piston cylinder neutral cavity from a neutral vent (611), a high-gear piston (615) pushes a piston rod to move rightwards until the high-gear piston (615) leans against the right wall of a piston cylinder, neutral gear withdrawing action is completed, the piston rod triggers a first position sensor (92) for controlling high gear and a second position sensor (93) for controlling low gear to be simultaneously disconnected, and the transfer case controller determines that the neutral gear is in place after receiving the disconnection signals of the two position sensors;

s800: the transfer case controller controls the low-gear high-speed electromagnetic valve to act, compressed air enters a piston cylinder neutral cavity from a low-gear vent hole (613), a low-gear piston (616) pushes a piston rod to move rightwards at the moment until the low-gear piston leans against the left wall of the piston cylinder to finish low-gear switching action, a second position sensor (93) for controlling low gear is closed at the moment, and the transfer case controller determines that the gear is in place after receiving a signal of closing the low-gear position sensor;

an intelligent electric control pneumatic transfer case operating mechanism for realizing the intelligent electric control pneumatic transfer case operating method is arranged on a transfer case and comprises a piston cylinder (6) with an opening at one end, a gear ventilation unit (61) arranged on the piston cylinder (6), a piston rod (7) with an end arranged in the opening of the piston cylinder (6), a sensing unit (9) arranged at one end of the piston rod (7) far away from the piston cylinder (6), a shifting fork (8) arranged on the piston rod (7) and positioned between the piston cylinder (6) and the sensing unit (9), and a synchronizer (81) arranged on the shifting fork (8); wherein, the first and the second end of the pipe are connected with each other,

the gear ventilation unit (61) comprises a neutral ventilation port (611) and a high ventilation port (612) which are arranged on the side surface of the piston cylinder (6) at intervals, a low ventilation port (613) which is arranged on the piston cylinder (6) and is far away from the opening end of the piston cylinder, and a piston unit which is arranged inside the piston cylinder (6); the neutral gear vent (611), the high gear vent (612) and the low gear vent (613) are respectively communicated with a neutral gear high-speed electromagnetic valve, a high gear high-speed electromagnetic valve and a low gear high-speed electromagnetic valve on a transfer case controller; the piston unit comprises a neutral position piston (614) and a high position piston (615) which are arranged on the side wall of the piston rod (7), and a low position piston (616) which is arranged on the neutral position piston (614);

the sensing unit (9) comprises a sensor supporting seat (91) arranged at one end of the piston rod (7) far away from the piston cylinder (6), a first position sensor (92) which is arranged on the sensor supporting seat (91) at intervals and used for controlling a high gear, and a second position sensor (93) used for controlling a low gear;

the tail end of the piston rod (7) is provided with a groove, and the depth and the length of the groove are determined according to the contact travel of a first position sensor (92) which is installed on a sensor supporting seat (91) and used for controlling a high gear and a second position sensor (93) used for controlling a low gear; the first position sensor (92) and the second position sensor (93) are triggered to be closed or opened with the groove through the left and right movement of the piston rod (7), corresponding information is sent to the transfer case controller, and then synchronous switching of different gears is achieved.

2. The intelligent electro-pneumatic transfer case operating method according to claim 1, characterized in that: the opening of the opening end of the piston cylinder (6) is just provided for the piston rod (7) to pass through;

the neutral piston (614) and the high piston (615) are both axially fixed with the piston rod (7); one side of the high-gear piston (615) is axially fixed with the piston rod (7), and the other side of the high-gear piston is fixed with the inner wall of the piston cylinder (6);

the piston rod (7) can be driven to move left and right by either the neutral piston (614) or the high gear piston (615).

3. The method for operating the intelligent electro-pneumatic transfer case according to claim 2, characterized in that: the high gear piston (615) is arranged at one end of the neutral piston (614) far away from the low gear vent hole (613),

an L-shaped notch is formed in the neutral piston (614), and faces towards the high-gear piston (615); the cross section of the low-gear piston (616) is in a Z shape with two vertical ends;

one end of the low-gear piston (616) is arranged at the L-shaped notch of the neutral piston (614), and the low-gear piston (616) can axially slide along the neutral piston (614);

when one end of the low-gear piston (616) is in hooking engagement with one end of the neutral-gear piston (614), a gap is formed between the low-gear piston (616) and the high-gear piston (615).

4. The method for operating the intelligent electro-pneumatic transfer case according to any one of claims 1-3, characterized by comprising the following steps: three cavities which are rectangular in cross section and are communicated with each other are sequentially and horizontally arranged in the piston cylinder (6) along the direction of the central axis of the piston rod (7), and the cavities are respectively a first cavity, a second cavity and a third cavity;

the first cavity is positioned at one end of the piston cylinder (6) close to the low-gear vent (613);

the opening of the third cavity can be just penetrated by the piston rod (7), and the piston rod (7) passes through the third cavity and then sequentially extends into the second cavity and the first cavity;

the junction of the first cavity and the second cavity forms a first step on the inner wall of the piston cylinder (6), the junction of the second cavity and the third cavity forms a second step on the inner wall of the piston cylinder (6), and the vertical wall of the first step is the first right wall of the piston cylinder (6); the vertical wall of the second step is a second right wall of the piston cylinder (6).

5. The intelligent electro-pneumatic transfer case operating method according to claim 4, characterized in that: one end of the low-gear piston (616) slides along the inner wall of the first cavity, and the other end of the low-gear piston slides along the inner wall of the second cavity;

when the piston rod (7) moves left and right, the high-gear piston (615) slides along the inner wall of the second cavity;

when the left end of the low-gear piston (616) abuts against the left wall of the piston cylinder (6), the right end of the low-gear piston (616) is connected with the inner wall of the second cavity.

6. The intelligent electro-pneumatic transfer case operating method according to any one of claims 1-3, characterized in that: when the piston rod (7) slides left and right in the piston cylinder (6), the piston rod also slides left and right in the sensor supporting seat (91);

one end of the shifting fork (8) is fixedly arranged at the middle section of the piston rod (7);

and the synchronizer (81) is fixedly arranged at the other end of the shifting fork (8) and is used for synchronizing the rotating speed of the normally meshed gear and the target gear.

7. The intelligent electro-pneumatic transfer case operating method according to any one of claims 1-3 and 5, characterized in that: the first position sensor (92) and the second position sensor (93) are respectively provided with a contact switch for controlling the opening and the closing of the sensors;

the contact switch on the first position sensor (92) and the second position sensor (93) is in a free state when the contact switch is located in the groove and in a compressed state when the contact switch is away from the groove.

8. The intelligent electro-pneumatic transfer case operating method according to any one of claims 1-3 and 5, characterized in that: when the low-gear piston (616) leans against the left wall of the piston cylinder (6), the piston rod (7) triggers the first position sensor (92) and the second position sensor (93) to be disconnected simultaneously;

when the high gear piston (615) moves left until the right end of the low gear piston (616) is engaged, the left movement of the synchronous piston rod (7) triggers the first position sensor (92) to close, and high gear combination is completed;

when the high-gear piston (615) leans against the second right wall of the piston cylinder, the piston rod (7) triggers the first position sensor (92) and the second position sensor (93) for controlling the low gear to be disconnected simultaneously, and neutral gear in place is completed;

the second position sensor (93) is closed when the low range piston (616) pushes the piston rod (7) to the right until the low range piston (616) abuts the piston cylinder first right wall.

9. The intelligent electro-pneumatic transfer case operating method according to any one of claims 1-3 and 5, characterized in that: and a radial sealing ring is arranged at the contact position of the low-gear piston (616) and the neutral-gear piston (614), and a radial sealing ring is also arranged between the low-gear piston (616) and the piston cylinder (6).