CN113062978A - Control system and control method for limping function of AT (automatic transmission) - Google Patents

Control system and control method for limping function of AT (automatic transmission) Download PDF

Info

Publication number
CN113062978A
CN113062978A CN202110287666.XA CN202110287666A CN113062978A CN 113062978 A CN113062978 A CN 113062978A CN 202110287666 A CN202110287666 A CN 202110287666A CN 113062978 A CN113062978 A CN 113062978A
Authority
CN
China
Prior art keywords
transmission
controller
limp
limp home
home controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110287666.XA
Other languages
Chinese (zh)
Other versions
CN113062978B (en
Inventor
杨帆
严鉴铂
刘义
李环
徐旭
毕乾坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Fast Gear Co Ltd
Original Assignee
Shaanxi Fast Gear Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Fast Gear Co Ltd filed Critical Shaanxi Fast Gear Co Ltd
Priority to CN202110287666.XA priority Critical patent/CN113062978B/en
Publication of CN113062978A publication Critical patent/CN113062978A/en
Application granted granted Critical
Publication of CN113062978B publication Critical patent/CN113062978B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1224—Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
    • F16H2061/1236—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios using fail priority valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller
    • F16H2061/1268—Electric parts of the controller, e.g. a defect solenoid, wiring or microprocessor

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The invention discloses a control system and a control method for a limp function of an AT (automatic transmission), wherein the system comprises a limp home controller, the limp home controller is respectively connected with a switch box, a relay box and an AT electromagnetic valve, so that the limp home controller and the AT electromagnetic valve can be directly connected when the relay box is closed in a limp home running mode, the limp home controller controls the AT electromagnetic valve, and after an electric control fault occurs in the AT, a transmission enters the limp home mode through a switch and safely returns to a destination. The scheme of the invention is simple and flexible, redundancy control is increased, and normal gear control of the transmission and normal driving of the vehicle are not influenced. The limping control of the system is controlled by the limping home controller of the transmission, so that gear control and fault judgment of the transmission are realized, and the system is safe, reliable and strong in interactivity. The control method in the scheme has strong applicability, has less requirement on the whole vehicle during matching, and can be used for limping home control of different types.

Description

Control system and control method for limping function of AT (automatic transmission)
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of transmission control, and particularly relates to a control system and a control method for a limping function of an AT transmission.
[ background of the invention ]
In the running process of the vehicle, because road conditions are complex and changeable, the load is large, and the possibility of accidental vehicle failure exists, if the failure is suddenly caused in the normal running process, the personal and property safety should be considered firstly, and the problem to be solved at this time is how to transport the vehicle to a repair place urgently. For large special vehicles, the rescue vehicles on roads are difficult to rescue, or the rescue vehicles can reach the vehicles only after a long time, if the fault vehicles have self-rescue capability, the solution is very recommended from the safety perspective or the cost perspective.
The "limp home" mode enables the electronic control system of the vehicle to still perform basic functions in the event of a failure, allowing the vehicle to travel to a nearby service location with minimal performance levels.
AT present, the limp home scheme of the AT transmission on the domestic market mainly aims AT mechanical faults or hydraulic faults, but when the AT transmission controller is damaged in the driving process of a vehicle, the whole vehicle is difficult to normally drive, and the existing limp home mode has no corresponding solution.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a control system and a control method for a limp function of an AT (automatic transmission) so as to solve the problem that the whole vehicle is difficult to normally run when an AT controller is damaged in the running process of the vehicle in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a limp home controller is connected with a switch box, a relay box, an engine controller and an AT transmission electromagnetic valve respectively; the relay box is connected with an AT transmission electromagnetic valve, the AT transmission electromagnetic valve is connected with a transmission clutch, and the transmission clutch is connected with a transmission output shaft;
the limp home controller is connected with an AT transmission controller.
The invention is further improved in that:
preferably, the limp home controller is connected with a meter.
Preferably, the instrument, the switch box, the limp home controller and the relay box are all arranged in a cab of the whole vehicle.
Preferably, the switch box is provided with a limp function activating switch, a neutral switch, a forward gear switch and a reverse gear switch.
Preferably, the AT transmission controller is connected with an AT transmission solenoid valve.
Preferably, the AT transmission controller is connected with a shift handle.
A control method of the control system for the limp function of the AT transmission based on any one of the above, comprising the steps of:
step 1, the limp home controller detects whether an AT transmission controller works normally; if not, executing the step 2, otherwise, continuously detecting whether the AT transmission controller works normally by the limp home controller;
step 2, when the function activation switch of the switch box is turned on, the limp home controller sends information to the relay box, the relay box is closed, and the electromagnetic valve of the AT transmission is powered by the limp home controller;
and 3, when a gear switch in the switch box is selected, the AT transmission electromagnetic valve enables different transmission clutches to work in a matched mode according to gear information, and the vehicle runs according to the gear information.
Preferably, in step 1, the limp home controller sends a signal to the AT transmission controller according to a set time timing; if the AT transmission controller returns a correct signal, the limp home controller judges that the AT transmission controller works normally; and if the AT transmission controller does not return the signal or returns an error signal, the limp home controller judges that the AT transmission controller does not work normally.
Preferably, in step 3, the AT transmission solenoid valve closes different transmission clutches through the cooperation of various oil passages, so that the whole vehicle runs in different gears.
Preferably, in step 3, the operation information of the transmission clutch is displayed by a meter.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a control system for a limp function of an AT (automatic transmission), which comprises a limp home controller, wherein the limp home controller is respectively connected with a switch box, a relay box and an AT electromagnetic valve, so that the limp home controller and the AT electromagnetic valve can be directly connected when the relay box is closed in a limp home running mode, the limp home controller controls the AT electromagnetic valve, and after an electric control fault occurs in the AT, a transmission enters the limp home mode through the switch and safely returns to a destination. The scheme of the invention is simple and flexible, redundancy control is increased, and normal gear control of the transmission and normal driving of the vehicle are not influenced. The limping control of the system is controlled by the limping home controller of the transmission, so that gear control and fault judgment of the transmission are realized, and the system is safe, reliable and strong in interactivity. The control method in the scheme has strong applicability, has less requirement on the whole vehicle during matching, and can be used for limping home control of different types.
Furthermore, the limp home controller is connected with the instrument, and the instrument, the switch box, the relay box and other devices are arranged in the cab of the whole vehicle, so that the operation of a driver is facilitated.
Furthermore, an activation switch and a three-gear state are arranged on the switch box, so that a driver can select the three-gear state according to requirements.
Furthermore, the AT transmission controller is connected with the AT transmission electromagnetic valve, so that the AT transmission can control the AT transmission electromagnetic valve in the normal running process of the automobile.
The invention also discloses a limp home control method of the AT transmission, wherein when the limp home controller detects that the AT transmission controller has problems, the limp home controller is directly connected with the AT transmission electromagnetic valve through the suction of the relay box so as to control the AT transmission electromagnetic valve, thereby replacing the control effect of the damaged AT transmission. The method mainly depends on an electric control mode to realize the limping function, mechanical or hydraulic parts do not need to be added, the realization mode is simple and convenient, the cost is low, the limping gear can be defined by a user, and the method is a low-cost and configurable limping home electric control method for the AT transmission.
[ description of the drawings ]
FIG. 1: the invention has a structure schematic diagram;
FIG. 2: the control logic flow diagram of the present invention;
in the figure: the automatic transmission comprises an AT transmission 1, an AT transmission controller 2, an AT transmission electromagnetic valve 3, a limp home controller 4, a switch box 5, a relay box 6, a cab 7 of the whole vehicle, an engine 8, an engine controller 9, a transmission output shaft 10, a meter 11, a gear shifting handle 12 and a transmission clutch 13.
In the figure: the solid lines represent mechanical connections, one dashed line represents signal connections, and the other dashed line represents oil control.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses an AT limping home control system and a control method. The invention is suitable for realizing limp home after an AT has an electric control fault, a vehicle must comprise an engine 8, an AT automatic transmission 1, an AT transmission controller 2, a limp home controller 4, a switch box 5, a relay box 6 and the like, the AT transmission controller 2 is a main control TCU, and the limp home controller 4 is a sub-control TCU, and the structural schematic diagram is shown in figure 1.
Referring to fig. 1, the invention discloses a control system for the limp function of an AT transmission, which comprises the AT transmission 1, a vehicle cab 7 and an engine 8, wherein the AT transmission 1 is mechanically connected with the engine 8 and is used for controlling the operation of the engine 8. The AT transmission 1 is in signal connection with the engine 8, and the AT transmission 1 is in signal connection with the cab 7 of the whole vehicle.
The AT transmission 1 comprises an AT transmission controller 2, an AT transmission electromagnetic valve 3 and an AT transmission clutch; a limp home controller 4, a switch box 5, a relay box 6, a meter 11 and a gear shifting handle 12 are arranged in the cab 7 of the whole vehicle; an engine controller 9 is provided in the engine 8. The power take-off of the AT transmission 1 is the transmission power transmitted through the transmission output shaft 10 to other components of the vehicle chassis.
The device has two connection modes corresponding to two running states:
when the automobile normally runs, the AT transmission controller 2 is in signal connection with the engine controller 9, the AT transmission controller 2 is in signal connection with the AT transmission electromagnetic valve 3, the AT transmission controller 2 is in signal connection with the instrument 11, the AT transmission controller 2 is in signal connection with the gear shifting handle 12, and the AT transmission controller 2 is in signal connection with the limp home controller 4. There is transmission clutch 13 AT 1 inside, AT transmission solenoid valve 3 and transmission clutch 13 mechanical connection, AT transmission controller 2 can realize the control to transmission clutch 13 through controlling AT transmission solenoid valve 3, can make specific clutch closed, makes up out different derailleur fender position, and the use road conditions of vehicle and the multiple driving demand that satisfies the driver can be richened to different fender positions. Automatic shift can alleviate driver's intensity of labour, AT derailleur 1 replaces the driver to make the judgement that goes up and down to keep off the position to a great extent, help the driver to switch different fender position simultaneously, when reducing intensity of labour, also have the help to the oil consumption economic nature of whole car, because AT derailleur 1 matches the oil consumption factor of having fully considered in earlier stage with engine 8, a large amount of work have been done on the optimization of AT derailleur 1 gearshift point, AT some special transport vehicles, AT derailleur 1 has unique advantage.
When the vehicle is in a limp home state, the engine controller 9 is in signal connection with the limp home controller 4, the limp home controller 4 is in signal connection with the instrument 11, the limp home controller 4 is in signal connection with the relay box 6, and the limp home controller 4 is in signal connection with the switch box 4; relay box 6 and AT transmission solenoid valve 3. When the limp home controller 4 is started, corresponding information is sent to the engine controller 9 through the CAN bus to indicate that the transmission is in a limp mode at the moment, and meanwhile, rotating speed and torque limiting instructions are sent to the engine controller 9, the rotating speed and the torque of the engine 8 are limited by the engine controller 9, and the function that the vehicle returns to a safe place at a lower speed is achieved.
Further, in the limp home mechanism of the present invention, the limp home controller 4 is in signal connection with the AT transmission controller 2, the limp home controller 4 is in signal connection with the switch box 5 and the relay box 6, and when the AT transmission controller 2 fails, the limp home controller 4 is in signal connection with the AT transmission solenoid valve 3 and the engine controller 9, respectively. According to the limp home control method, after the limp home controller 4 receives the signal that the AT transmission controller 2 works abnormally, the limp home controller takes over the control of the AT transmission electromagnetic valve 3, so that the limp home function is realized.
Further, in the limp home mechanism of the present invention, the AT transmission solenoid valve 3 is mechanically connected to the transmission, and when the AT transmission controller 2 is operating normally, the AT transmission solenoid valve 3 is controlled by the AT transmission controller 2, and when the AT transmission controller 2 is out of order, the AT transmission solenoid valve 3 is controlled by the limp home controller 4.
Further, in the limp home mechanism, the control current of the AT transmission solenoid valve 3 comes from the AT transmission controller 2 or the limp home controller 4, after the AT transmission solenoid valve 3 is powered on, the AT transmission 1 oil closes the transmission clutch 13 through different oil paths, and the combination of specific clutches can form power transmission, so as to drive the vehicle to move forward or backward. The AT transmission controller 2 is in signal connection with the transmission solenoid valve, the AT transmission controller 2 is in signal connection with the limp home controller 4, the AT transmission solenoid valve 3 can be selected through a switch to be controlled by the AT transmission controller 2 or the limp home controller 4, when the AT transmission controller 2 breaks down, the operation is switched to the limp home controller 4, the solenoid valve receives control current from the limp home controller 4, and the limp home function is achieved.
Further, in the limp home mechanism of the present invention, there are 4 switches in the switch box 5, one of which is a limp function activating switch, and the other 3 of which respectively control the AT transmission 1 to be in a neutral state, a forward state, and a reverse state. That is, when the AT transmission controller 2 system fails, the limp home controller 4 may control the transmission solenoid valve so that the transmission is in three limp operating conditions.
The limp home mechanism provided by the invention uses the limp home controller 4 to provide backup, so that when the AT transmission controller 2 fails, the vehicle can still run AT low speed and return to a specific position for maintenance.
A control system and a control method for AT transmission limp home, particularly referring to the control logic diagram of FIG. 2, the control method comprises the following steps,
step 1, in the running process of an automobile, a limp home controller 4 transmits a signal to an AT transmission controller 2 according to set time; when a vehicle normally runs, the AT transmission electromagnetic valve 3 is controlled by the AT transmission controller 2, the AT transmission controller 2 is connected with the engine controller 9 and the instrument 11 through signals, the engine controller 9 normally controls the engine 8 to normally run, a driver operates the gear shifting handle 12 in the cab 7 of the whole vehicle, when the vehicle moves from an N gear to a D gear, the vehicle can move forward after the driver steps on an accelerator, and the AT transmission controller 2 calculates a proper gear according to the opening degree of the accelerator and the rotating speed of the transmission output shaft 10 and realizes gear switching; the essence of realizing gear shifting is that the selection and the switching of different transmission routes of the AT transmission 1 are realized by changing the control current of the electromagnetic valve 3 of the AT transmission and adjusting the combination of the clutch 13 of the transmission; the AT transmission electromagnetic valve 3 changes the size and the direction of a hydraulic oil circuit under the action of control current, pushes the transmission clutch 13 to be combined or separated, and combines two different groups of transmission clutches 13 to form a certain gear of the AT transmission 1. When the vehicle is in normal operation, the AT transmission controller 2 and the limp home controller 4 are in simultaneous operation, and the limp home controller 4 does not participate in the control of the transmission; the limp home controller 4 monitors the working state of the AT transmission controller 2 in real time through CAN communication; the AT transmission 1 is mechanically connected to the engine 8, and the power and torque of the engine 8 are transmitted to other driveline components through the AT transmission 1.
Step 2, the limp home controller 4 receives a normal signal returned by the AT transmission controller 2, repeats the step 1 and continuously monitors the AT transmission controller 2; when the limp home control 4 does not receive a signal of returning to normal operation, executing the step 3; in the running process of a special transport vehicle, if the AT transmission controller 2 is abnormal, the AT transmission electromagnetic valve 3 is not controlled, because the transmission clutch 13 is a normally open electromagnetic valve, the torque of the engine 8 cannot be transmitted through the AT transmission 1 AT the moment, the AT transmission 1 cannot realize the power transmission function, the vehicle cannot run normally, and the influence on the safety of the vehicle is great; when the electric control fault occurs to the transmission, the limp home controller 4 monitors that the working state of the AT transmission controller 2 is abnormal, the limp function switch is in a closed state, and the limp home function is started; the limp home controller 4 drives the relay box 6 to suck, and the AT transmission electromagnetic valve 3 is controlled by the limp home controller 4; according to the switch state, the transmission 1 can enter a limp neutral gear, a limp forward gear and a limp reverse gear; when the target is reached, the activation button in the switch box 5 is turned off, and the limp home controller 4 is powered off and stops working. When the AT transmission controller 2 is in fault, the AT transmission 1 is in an abnormal state, the limp home controller 4 supplies power to the AT transmission electromagnetic valve 3 AT the moment, and the transmission clutch is combined to form a power transmission path so as to realize the limp function under a specific gear.
Further, a limp home controller 4, a switch box 5 and a relay box 6 are introduced into the system, the 3 components are all placed in a cab 7 of the whole vehicle, and the switch box 5 is clearly indicated and is not strictly forbidden under special conditions; the limp home controller 4 can replace the AT transmission controller 2 to realize management and control of the AT transmission 1; the switch box 5 serves as a switch for turning on the limp home function, and also controls the AT transmission 1 to be in a specific limp range; the relay box 6 switches the source of the control current of the AT transmission solenoid 3, i.e. the control signal from the AT transmission controller 2 or the limp home controller 4, so that the control command can be transmitted to the AT transmission solenoid 3, achieving the function of pushing the transmission clutch 13.
More specifically, when the driver is in the limp home state, the limp function activation switch in the switch box 5 is pressed first, and AT this time, the limp home controller 4 takes over the AT transmission controller 2 to realize the control of the AT transmission 1; the specific limp home controller 4 controls the relay box 6 to suck, the control command switching of the AT transmission electromagnetic valve 3 is completed, and then the AT transmission electromagnetic valve 3 is controlled by the limp home controller 4 and is unrelated to the AT transmission controller 2; the driver selects corresponding AT derailleur 1 fender position according to the driving demand, has designed 3 kinds of different AT derailleur 1 fender positions, is respectively: neutral (N keeps off), advance the fender (D1 fender), reverse gear (R fender), 3 switches that correspond are respectively: the neutral gear (N gear) starting switch, the forward gear (D1 gear) starting switch and the reverse gear (R gear) starting switch are reasonably used by a driver, and therefore the limping function that the vehicle is out of position and the driver returns to a maintenance point can be achieved. In the N gear, the fifth clutch works; in gear D1, the first clutch and the fifth clutch are simultaneously operated, and in gear R, the third clutch and the fifth clutch are simultaneously operated.
When in the gear D1 or the gear R, the limp home controller 4 sends a torque and speed limiting command to the engine controller 9 through the CAN bus, and the engine controller 9 limits the speed and torque of the engine 8 in different gears.
In a limp home state, the engine controller 9, the meter 11 and other components are in signal connection with the limp home controller 4, the engine controller 9 transmits an accelerator opening signal to the limp home controller 4, the meter 11 collects the signal of the limp home controller 4, and information such as the gear position and the oil temperature of the AT transmission 1 is displayed on the meter 11, so that a driver can conveniently check the information.
Further, the limp home controller 4 sends a limp state signal to the meter 11 when the AT transmission 1 is in a limp state, and displays that the vehicle is in the limp state AT the moment to remind the driver of careful driving; when the AT transmission 1 is in the limp home state, the limp home controller 4 sends a limp state signal to the engine controller 9, so that the torque of the engine 8 AT the time is limited, the safety of the transmission system is protected, and the vehicle is safely overhauled when arriving AT the destination. The limp home controller 4 controls the AT transmission solenoid valve 3 so that the corresponding clutch is closed.
From the point of view of the respective devices, the control method of the present invention involves the following main aspects:
AT transmission controller 2: when a vehicle normally runs, the transmission electromagnetic valve 3 is controlled by the AT transmission controller 2, the AT transmission controller 2 is in signal connection with an ECU (electronic control Unit) of an engine and a whole vehicle instrument, interaction with the engine in a gear shifting process is realized, functions such as gear information and transmission oil temperature are displayed on the instrument, and when the AT transmission controller 2 fails to work normally, the transmission electromagnetic valve 3 is not controlled, a driver cannot realize a gear engaging function and an automatic gear lifting function, and the vehicle is trapped in a certain position;
2. limp home controller 4: when the vehicle normally runs, the limp home controller 4 is in a silent state and is in signal connection with the AT transmission controller 2, when the AT transmission controller 2 is detected to be abnormal, the limp home controller 4 enters a standby state, and after a driver turns on a limp mode switch, the limp home controller 4 is started and enters a working state;
3. and a relay box 6: the relay box 6 is in signal connection with the limp home controller 4, the control right of the AT transmission electromagnetic valve 3 is switched, the limp home controller 4 is placed AT a proper position of a cab, the control of the AT transmission electromagnetic valve 3 is realized by controlling the relay box 6, and then the corresponding clutch is driven to be closed, so that the power transmission of the transmission is realized;
4. switch box 5: there are 4 switches in the switch box 5, and one of them is limp function switch, and other 3 are controlled the derailleur to be in a certain limp position respectively, are 1 fender of marching forward respectively, neutral gear and reverse gear (the function is nimble here, can adjust the limp position according to user's requirement).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The control system for the limp function of the AT transmission is characterized by comprising a limp home controller (4), wherein the limp home controller (4) is respectively connected with a switch box (5), a relay box (6), an engine controller (9) and an AT transmission electromagnetic valve (3); the relay box (6) is connected with an AT transmission electromagnetic valve (3), the AT transmission electromagnetic valve (3) is connected with a transmission clutch (13), and the transmission clutch (13) is connected with a transmission output shaft (10);
the limp home controller (4) is connected with an AT transmission controller (2).
2. The control system for the limp function of an AT transmission according to claim 1, characterized in that a meter (11) is connected to the limp home controller (4).
3. The control system for the limp function of the AT transmission is characterized in that the instrument (11), the switch box (5), the limp home controller (4) and the relay box (6) are all arranged in a cab (7) of the whole vehicle.
4. The control system for limp function of AT transmission according to claim 1, characterized in that the switch box (5) is provided with limp function activating switch, neutral switch, forward switch and reverse switch.
5. The control system for limp function of an AT transmission according to claim 1, characterized in that an AT transmission solenoid valve (3) is connected to the AT transmission controller (2).
6. The control system for the limp function of an AT transmission as claimed in claim 1, wherein a shift lever (12) is connected to the AT transmission controller (2).
7. A control method of the control system for the limp function of the AT transmission according to any one of claims 1 to 6, comprising the steps of:
step 1, the limp home controller (4) detects whether the AT transmission controller (2) works normally; if not, executing the step 2, otherwise, continuously detecting whether the AT transmission controller (2) works normally by the limp home controller (4);
step 2, when a function activation switch of the switch box (5) is turned on, the limp home controller (4) sends information to the relay box (6), the relay box (6) is closed, and the AT transmission electromagnetic valve (3) is powered by the limp home controller (4);
and 3, when a gear switch in the switch box (5) is selected, the AT transmission electromagnetic valve (3) enables different transmission clutches (13) to work in a matched mode according to gear information, and the vehicle runs according to the gear information.
8. The control method according to claim 7, characterized in that in step 1, the limp-home controller (4) sends a signal to the AT transmission controller (2) according to a set time timing; if the AT transmission controller (2) returns a correct signal, the limp home controller (4) judges that the AT transmission controller (2) works normally; if the AT transmission controller (2) does not return a signal or returns an error signal, the limp home controller (4) judges that the AT transmission controller (2) does not work normally.
9. The control method according to claim 7, characterized in that in step 3, the AT transmission solenoid valve (3) closes different transmission clutches (13) through the matching of the adjusting oil circuit, so that the whole vehicle runs in different gears.
10. Control method according to claim 7, characterized in that in step 3, information on the operation of the transmission clutch (13) is displayed by means of a meter (11).
CN202110287666.XA 2021-03-17 2021-03-17 Control system and control method for AT transmission limp-home function Active CN113062978B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110287666.XA CN113062978B (en) 2021-03-17 2021-03-17 Control system and control method for AT transmission limp-home function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110287666.XA CN113062978B (en) 2021-03-17 2021-03-17 Control system and control method for AT transmission limp-home function

Publications (2)

Publication Number Publication Date
CN113062978A true CN113062978A (en) 2021-07-02
CN113062978B CN113062978B (en) 2023-04-21

Family

ID=76561045

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110287666.XA Active CN113062978B (en) 2021-03-17 2021-03-17 Control system and control method for AT transmission limp-home function

Country Status (1)

Country Link
CN (1) CN113062978B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008064177A (en) * 2006-09-06 2008-03-21 Jatco Ltd Failure control device for automatic transmission during vehicle stop
CN102705505A (en) * 2012-06-19 2012-10-03 中联重科股份有限公司 Engineering vehicle control equipment, control method and engineering vehicle
CN203093853U (en) * 2012-12-26 2013-07-31 联合汽车电子有限公司 Body control module
CN103277502A (en) * 2013-06-24 2013-09-04 广西柳工机械股份有限公司 Variable speed control system for loader
CN205001499U (en) * 2015-09-18 2016-01-27 广西柳工机械股份有限公司 Limping gear shift variable speed control system
CN107366581A (en) * 2016-05-11 2017-11-21 博世株式会社 Electronic-controlled installation and electronic control method
CN111594326A (en) * 2020-06-01 2020-08-28 安徽华菱汽车有限公司 Method for preventing engine limitation from being removed after vehicle speed sensor is removed

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008064177A (en) * 2006-09-06 2008-03-21 Jatco Ltd Failure control device for automatic transmission during vehicle stop
CN102705505A (en) * 2012-06-19 2012-10-03 中联重科股份有限公司 Engineering vehicle control equipment, control method and engineering vehicle
CN203093853U (en) * 2012-12-26 2013-07-31 联合汽车电子有限公司 Body control module
CN103277502A (en) * 2013-06-24 2013-09-04 广西柳工机械股份有限公司 Variable speed control system for loader
CN205001499U (en) * 2015-09-18 2016-01-27 广西柳工机械股份有限公司 Limping gear shift variable speed control system
CN107366581A (en) * 2016-05-11 2017-11-21 博世株式会社 Electronic-controlled installation and electronic control method
CN111594326A (en) * 2020-06-01 2020-08-28 安徽华菱汽车有限公司 Method for preventing engine limitation from being removed after vehicle speed sensor is removed

Also Published As

Publication number Publication date
CN113062978B (en) 2023-04-21

Similar Documents

Publication Publication Date Title
CN101501370B (en) Diagnostic system for automatic transmission
CN100358745C (en) Range determination apparatus, range determination method, and program therefor
US8864626B2 (en) Hydraulic control device of automatic transmission
CN101828052B (en) Vehicle controller
CN102072318B (en) Control apparatus for automatic transmission
JP5612624B2 (en) Range switching device
CN107575565A (en) A kind of control method of electric gear change system
GB2423800A (en) Motor vehicle with emergency auxiliary gear selector
JP4316520B2 (en) Vehicle control apparatus and control method thereof
ES2314226T3 (en) TORQUE INTERRUPTION SYSTEM OF A DRIVE CHAIN OF A VEHICLE.
CN113062978A (en) Control system and control method for limping function of AT (automatic transmission)
JP2006349163A (en) Gear control unit for transmission of drivetrain of vehicle
US7128686B2 (en) Method and apparatus for synchronized PTO control in a motor vehicle powertrain
JP2001304395A (en) Controller for automatic transmission
JP4789498B2 (en) Shift mode control device for automatic transmission
JP2848309B2 (en) Transmission control device
JP4456721B2 (en) Control device for automatic transmission
JP2001191819A (en) Control device for automatic transmission
US20170211689A1 (en) Control device of automatic transmission and method of controlling automatic transmission
CN107859736B (en) Gear shifting control method with reversing protection function
CN103270348B (en) Control device for automatic transmission for vehicle
CN220622707U (en) Power takeoff protection circuit and engineering machinery
JP2000127806A (en) Emergency stop device for construction vehicle
JP4310985B2 (en) Shift control device
JP2006057695A (en) Emergency transmission

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant