CN115163824B - P-gear executing device fault processing method and P-gear executing device - Google Patents

P-gear executing device fault processing method and P-gear executing device Download PDF

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Publication number
CN115163824B
CN115163824B CN202210734629.3A CN202210734629A CN115163824B CN 115163824 B CN115163824 B CN 115163824B CN 202210734629 A CN202210734629 A CN 202210734629A CN 115163824 B CN115163824 B CN 115163824B
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China
Prior art keywords
gear
valve
hydraulic pressure
tcu
position sensor
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CN202210734629.3A
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Chinese (zh)
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CN115163824A (en
Inventor
曾云鹏
王明玉
宁甲奎
李长洲
孙鹏远
张荣辉
张振威
于天浩
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FAW Group Corp
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FAW Group Corp
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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
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F16H63/3416—Parking lock mechanisms or brakes in the transmission
    • F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating means
    • 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
    • F16H2061/1216—Display or indication of detected failures

Abstract

The invention belongs to the technical field of gearboxes, and discloses a fault processing method of a P-gear executing device and the P-gear executing device. According to the P gear fault processing method, the P gear real-time position, the position sensor state, the driver instruction and the vehicle speed can be combined through the TCU to diagnose the fault type, the hydraulic pressure valve is controlled according to the fault type and the driver instruction to enable the hydraulic pressure valve to be combined with the elastic force of the elastic piece to perform fault emergency processing when the fault is displayed by the instrument, if the vehicle is in a non-driving state, parking is assisted, if the vehicle is in a driving state, safe driving of the vehicle is guaranteed until parking after parking, the operation is convenient, the safety coefficient is high, and the vehicle can be guaranteed to safely drive when the vehicle needs to move continuously after the fault occurs. The P-gear executing device can control the hydraulic pressure valve through the TCU to realize the instruction that a driver hangs in the P gear or hangs in the NP gear by the P gear, and the P-gear executing device is simple in structure, convenient to operate and small in occupied space.

Description

P-gear executing device fault processing method and P-gear executing device
Technical Field
The invention belongs to the technical field of gearboxes, and discloses a fault processing method of a P-gear executing device and the P-gear executing device.
Background
With the rapid development of society, the popularity of automatic transmission-mounted automatic transmission vehicles in the market is increasing day by day. Because the automatic gear vehicle generally does not need to carry out gear shifting operation in the driving process, the driving difficulty is reduced to a great extent, and the driving experience of a driver is improved.
Inside an automatic transmission, a specific P-range parking lock mechanism is generally provided. The driver mechanically locks the transmission output shaft portion by manipulating the P gear to achieve the purpose of parking. Because the core function of the P-gear parking locking mechanism is braking after parking, the vehicle is prevented from moving, and the vehicle is parked on a flat road surface and a ramp safely and reliably for a long time, the reliability of the P-gear parking locking mechanism has very important influence on the safety of the vehicle. The prior art has the defects of complex operation, complex assembly, high cost and incapability of timely displaying faults to a driver, and can not realize the safety of vehicles under the condition that the vehicles need to be continuously moved after the faults occur.
Disclosure of Invention
An object of the present invention is to provide a vehicle capable of preventing a P range from being out of a vehicle if a P range failure occurs while the vehicle is stopped; when the vehicle has a P gear fault, but needs to emergent P gear moving vehicles, the vehicle can drive in the P gear under the premise of ensuring safety; in the high-speed state of the vehicle, the accident that the vehicle is mistakenly engaged into the P gear is prevented, and the safety of the vehicle and a driver is ensured.
To achieve the purpose, the invention adopts the following technical scheme:
a fault processing method of a P-gear executing device comprises the following steps:
s10, the TCU is combined with the P gear real-time position, the position sensor state, the driver instruction and the vehicle speed to diagnose the fault type;
and S20, displaying the fault type by the instrument, and controlling the hydraulic pressure valve by the TCU according to the fault type and the driver instruction so as to enable the hydraulic pressure to be combined with the elasticity of the elastic piece to carry out fault emergency treatment.
Preferably, when the vehicle performs the P shift into the engaged state and the P shift into the engaged state is failed, the P shift performing device failure processing method includes the steps of:
s110, judging a position sensor fault or a locking valve fault;
s120, when the position sensor fails and the locking valve does not fail, executing an open loop control scheme to enable the vehicle to smoothly enter the P gear, and displaying corresponding failure by an instrument;
s130, executing a valve flushing scheme when the locking valve fails and the position sensor does not fail, so that the vehicle normally enters the P gear;
and S140, if the valve flushing scheme fails, the instrument displays corresponding faults.
Preferably, the open loop control scheme comprises the steps of:
s121, controlling the locking valve to be opened and controlling the hydraulic pressure valve to be closed;
s122, the elastic piece drives the gear shift lever to enter the P gear, and the locking valve is controlled to be closed.
Preferably, the valve flushing scheme comprises the following steps:
s131, starting a hydraulic pressure valve, and controlling the pressure output of the hydraulic pressure valve to be a pressure value balanced with the elastic piece when the gear lever is in the NP gear;
and S132, executing a P gear engaging instruction after switching the locking valve back and forth for three times, if the P gear engaging is successful, the valve flushing scheme is successful, and otherwise, closing the hydraulic pressure valve.
Preferably, when the shift lever fails from the NP shift position to the P shift position unexpectedly when the vehicle speed is higher than a predetermined threshold, the P shift position executing apparatus failure processing method includes the steps of:
s210, starting an emergency P gear outlet scheme;
s220, displaying corresponding faults by the instrument;
s230, after the driver parks and sends a command of engaging in the P gear, the driver exits the emergency P-out scheme and executes the command of engaging in the P gear.
Preferably, the emergency P-out scheme comprises the following steps:
s211, starting a hydraulic pressure valve and enabling the hydraulic pressure valve to be normally open;
and S212, controlling the pressure output of the hydraulic pressure valve to be a pressure value when the gear shift lever is in the NP gear.
Preferably, when a shift from the gear lever to the NP shift into the P shift occurs, the P shift execution device failure processing method includes the steps of:
s310, judging a position sensor fault or a locking valve fault;
s320, if the position sensor fails but the locking valve is not failed, the P-gear instruction is not executed, and the instrument displays related faults;
s330, if the locking valve fault position sensor is not faulty, the P-gear instruction is not executed, and the instrument displays related faults;
and S340, if the instrument displays that the fault is caused, the driver still sends a P gear pushing instruction, and when the number of times exceeds a threshold value, the emergency P gear pushing scheme is started until the driver stops and hangs in the P gear, the emergency P gear pushing scheme is exited, and the P gear hanging instruction is executed.
The invention further aims to provide the P-gear executing device which is small in number of parts, easy to assemble and small in occupied whole vehicle arrangement space.
To achieve the purpose, the invention adopts the following technical scheme:
a P-gear executing device, comprising:
the hydraulic cylinder is internally provided with hydraulic oil;
the hydraulic pressure valve is communicated with the hydraulic cylinder and is electrically connected with the TCU, and the TCU can control the opening, closing and oil pressure of the hydraulic pressure valve;
a gear shifting hydraulic cylinder;
the piston is movably arranged in the gear shifting hydraulic cylinder;
one end of the gear shift lever is provided with a P gear slot and a NP gear slot, and the other end of the gear shift lever is connected with the piston;
the elastic piece is arranged in the gear shifting hydraulic cylinder, one end of the elastic piece is abutted against the gear shifting hydraulic cylinder, the other end of the elastic piece is abutted against the piston, and the hydraulic pressure valve is communicated with one side, far away from the elastic piece, of the gear shifting hydraulic cylinder;
and the locking valve is matched with the P blocking groove or the NP blocking groove to limit the position of the gear lever, the locking valve is electrically connected with the TCU, and the TCU can control the opening and closing of the locking valve.
Preferably, the P range execution device further includes:
the position sensor is arranged on the transmission and is configured to detect the position of the gear level, the position sensor is electrically connected with the TCU, the TCU can detect the position of the gear level through the position sensor in real time, and the TCU can detect the voltage value of the position sensor in real time to judge the state of the position sensor.
Preferably, the P range execution device further includes:
and the throttle valve is communicated with a hydraulic oil path between the hydraulic pressure valve and the gear shifting hydraulic cylinder.
The beneficial effects are that: the P gear fault processing method can combine the P gear real-time position, the position sensor state, the driver instruction and the vehicle speed to obtain an accurate fault type through the TCU, and control the hydraulic pressure valve according to the fault type and the driver instruction to enable the hydraulic pressure to be combined with the elastic force of the elastic piece for fault processing, if the fault processing fails, the corresponding fault type is displayed by the instrument to prompt the driver, and the pressure value output by the hydraulic pressure valve can be controlled to enable the vehicle to safely run until parking is achieved after parking, so that the operation is convenient, and the safety coefficient is high. The P-gear executing device can control the hydraulic pressure valve through the TCU to achieve the instruction that a driver hangs in the P gear or hangs in the NP gear through the P gear, and the P-gear executing device is simple in structure, convenient to operate and small in occupied space.
Drawings
Fig. 1 is a schematic structural diagram of a P-gear executing device according to an embodiment of the present invention;
FIG. 2 is a flow chart of fault handling of the P-gear executing device provided by the embodiment of the invention;
FIG. 3 is a flow chart of a process for an in-gear P failure in accordance with an embodiment of the present invention;
FIG. 4 is a flow chart of a process for an unexpected shift failure of a shift lever from NP to P according to an embodiment of the present invention;
fig. 5 is a flowchart of a process for an NP-shift into P-shift failure according to an embodiment of the present invention.
In the figure:
1. a locking valve; 2. a shift lever; 3. a filter; 4. a position sensor; 5. an elastic member; 6. a piston; 7. a gear shifting hydraulic cylinder; 8. a throttle valve; 9. a hydraulic pressure valve.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The embodiment provides a P gear executing device, which is used for executing a command of a driver when the driver sends a command of engaging in the P gear or a command of engaging in the NP gear by the P gear, so as to ensure the normal running of a vehicle.
In the prior art, the P-gear parking locking mechanism mainly comprises two types of mechanical power-assisted locking mechanisms and electric power-assisted locking mechanisms. The mechanical power-assisted locking mechanism mainly controls the locking and releasing of the P gear through a stay rope, adopts a stay rope structure, needs to consider the stay rope curvature arrangement, has certain requirements on the whole vehicle space, has certain operating force, and occupies certain space on a center console. The electric power-assisted locking mechanism mainly realizes the locking and releasing of the P gear by controlling the driving motor to rotate positively and negatively, and is characterized by saving space, no need of a guy cable, convenient connection, flexible structural layout, and simultaneously improving the maneuvering performance and reducing the releasing force of the P gear on the ramp. Whether the mechanical power-assisted parking locking mechanism or the electric power-assisted locking mechanism is adopted, additional mechanical parts are required to be added outside the transmission, the whole vehicle arrangement space is occupied, the number of parts is increased, and the integration of the transmission assembly on the whole vehicle is inconvenient.
In order to solve the above problems, as shown in fig. 1, the P-gear executing device of the present embodiment is hydraulically controlled, and compared with two types of mechanically assisted locking mechanism and electrically assisted locking mechanism, the hydraulic control mode is adopted to not only control more precisely, but also occupy less space, which is beneficial to the integration of the transmission assembly on the whole vehicle.
Specifically, as shown in fig. 1, the P-gear executing device provided in the present embodiment includes a hydraulic cylinder, a hydraulic pressure valve 9, a shift hydraulic cylinder 7, a piston 6, a shift lever 2, an elastic member 5, and a lock valve 1. Wherein the hydraulic cylinder is internally provided with hydraulic oil, and a hydraulic pressure valve 9 is communicated with the hydraulic cylinder. The piston 6 is movably arranged in the gear shifting hydraulic cylinder 7, the elastic piece 5 is arranged in the gear shifting hydraulic cylinder 7, one end of the elastic piece is abutted against the gear shifting hydraulic cylinder 7, the other end of the elastic piece is abutted against the piston 6, the hydraulic pressure valve 9 is communicated with one side, far away from the elastic piece 5, of the gear shifting hydraulic cylinder 7, the P-gear groove and the NP-gear groove are formed in one end of the gear shifting lever 2, the other end of the gear shifting lever 2 is connected with the piston 6, and the locking valve 1 is matched with the P-gear groove or the NP-gear groove to limit the position of the gear shifting lever 2. The pressure valve can provide certain pressure for the hydraulic oil in the pneumatic cylinder for hydraulic oil enters into the gear shifting pneumatic cylinder 7 under the effect of pressure, and when the pressure of hydraulic oil is greater than the elasticity of the elastic piece 5, piston 6 moves leftwards, drives gear level 2 to move leftwards simultaneously, thereby making locking valve 1 shift from being aligned with the P gear groove to being aligned with the NP gear groove. When the pressure of the hydraulic oil is smaller than the elastic force of the elastic member 5, the piston 6 moves rightward under the action of the elastic member 5, and drives the shift lever 2 to move rightward, so that the locking valve 1 shifts from alignment with the NP shift slot to alignment with the P shift slot. And further, the instruction of hanging the NP from the P gear or the instruction of hanging the P from the NP gear is realized, and the structure is simple and the operation is convenient. Optionally, the elastic element is a spring, so that the cost is low, and the replacement and purchase are easy.
Further, for convenience of control, the hydraulic pressure valve 9 is electrically connected with an automatic transmission control unit (Transmission Control Unit, TCU) which can control opening and closing of the hydraulic pressure valve 9 and oil pressure, the latch valve 1 is electrically connected with the TCU, and the TCU can control opening and closing of the latch valve 1. When the driver sends an instruction of shifting into the NP gear by the P gear or an instruction of shifting into the P gear by the NP gear, the TCU can control the locking valve 1 to be opened and simultaneously control the hydraulic pressure valve 9 to be opened, control the hydraulic pressure valve 9 to give pressure to the hydraulic cylinder when the gear shift lever 2 is in the P gear or the NP gear, pressure oil enters the gear shift hydraulic cylinder 7 under corresponding pressure and is matched with the elastic piece 5 to drive the gear shift lever 2 to move leftwards or rightwards, and when the piston 6 is positioned at a stable position and does not move any more, the TCU controls the locking valve 1 to be closed so as to finish the instruction of the driver, and the gear shift lever is convenient to operate and accurate in action.
Further, as shown in fig. 1, the P-gear executing device further includes a position sensor 4, the position sensor 4 is disposed on the transmission, the position sensor 4 can detect the position of the gear lever, and the position sensor 4 is electrically connected with the TCU, the TCU can detect the position of the gear lever 2 in real time through the position sensor 4, and the gear lever 2 has a certain range of position threshold value corresponding to the TCU when in the P-gear, and the gear lever 2 has a certain range of position threshold value corresponding to the TCU when in the NP-gear, so that the TCU can recognize the position of the gear lever 2 and ensure that the P-gear groove or the NP-gear groove can be accurately aligned with the locking valve 1 after the gear lever 2 is moved in place, thereby avoiding gear shift due to misalignment of the locking valve 1 and the P-gear groove or the NP-gear groove, thereby avoiding dangerous occurrence, and improving safety of a vehicle and a driver.
Further, as shown in fig. 1, the P-gear executing device further comprises a filter 3, the filter 3 is arranged on the hydraulic oil path between the throttle valve 8 and the hydraulic pressure valve 9 and the gear shifting hydraulic cylinder 7, and the filter 3 can filter the hydraulic oil so as to avoid excessive impurities in the hydraulic oil, prevent the hydraulic pipeline from being blocked by accumulation of the impurities, avoid the failure of the P-gear executing device, and further ensure the service life of the P-gear executing device.
Further, as shown in fig. 1, the P gear executing device further comprises a throttle valve 8, the throttle valve 8 is communicated with a hydraulic oil path between the hydraulic pressure valve 9 and the gear shifting hydraulic cylinder 7, the throttle valve 8 can control the flow rate of hydraulic oil passing through the hydraulic oil path, so that the throttle valve 8 is kept uniform, the condition that the pressure value of hydraulic oil flowing into the gear shifting hydraulic cylinder 7 is high or low due to nonuniform flow rate of the hydraulic oil flowing into the gear shifting hydraulic cylinder 7 is avoided, the gear shifting lever 2 can uniformly move, the gear shifting lever cannot move back and forth after exceeding a travel range due to excessively high and excessively fast instantaneous pressure, and the P gear slot or the NP gear slot can be accurately aligned with the locking valve 1, so that a P gear instruction is hung or an NP gear instruction is hung.
Next, the steps when the P-range execution device executes the instruction of the driver will be described in detail.
After the driver sends the command to engage P gear:
s1, the TCU controls the locking valve 1 to be opened, simultaneously controls the hydraulic pressure valve 9 to be opened, and controls the hydraulic pressure valve 9 to output the pressure when the gear lever 2 is positioned at the P gear;
s2, after being pressurized by a hydraulic pressure valve 9, hydraulic oil is introduced into a gear shifting hydraulic cylinder 7 and then drives a piston 6 to move right until the pressure of the hydraulic oil is balanced with the elasticity of an elastic piece 5;
s3, the TCU drives the locking valve 1 to close after detecting that the gear shift lever 2 reaches the threshold value of the P gear position through the position sensor 4;
and S4, the TCU controls the hydraulic pressure valve 9 to release pressure, and when the hydraulic oil returns to the hydraulic cylinder, the TCU controls the hydraulic pressure valve 9 to close.
After the driver sends a command to shift from P gear to NP gear:
s01, the TCU controls the locking valve 1 to be opened, simultaneously controls the hydraulic pressure valve 9 to be opened, and controls the hydraulic pressure valve 9 to output the pressure when the gear lever 2 is positioned at the NP gear;
s02, pressurizing the hydraulic oil through a hydraulic pressure valve 9, and then introducing the pressurized hydraulic oil into a gear shifting hydraulic cylinder 7, wherein the elastic piece 5 drives the piston 6 to move left until the pressure of the hydraulic oil is balanced with the elastic force of the elastic piece 5;
s03, the TCU drives the locking valve 1 to close after detecting that the gear lever 2 reaches the NP gear position through the position sensor 4;
and S04, the TCU controls the hydraulic pressure valve 9 to release pressure, and when the hydraulic oil returns to the hydraulic cylinder, the TCU controls the hydraulic pressure valve 9 to close.
In the above steps, when the shift lever 2 moves in place, the locking valve 1 is closed and can be abutted against the corresponding P-gear groove or NP-gear groove on the shift lever 2, so that the shift lever 2 is not moved any more, and the hydraulic pressure valve 9 is not required to provide pressure at the moment, so that the TCU can control the hydraulic pressure valve 9 to release pressure after the locking valve 1 is closed, and close the hydraulic pressure valve 9, thereby saving electric quantity, further saving fuel and reducing the fuel consumption of the whole vehicle.
Further, the voltage analog quantity corresponding to the position sensor 4 is arranged at the port of the TCU, so that the voltage value of the position sensor 4 can be detected in real time to judge whether the position sensor 4 is in a normal working state. In addition, the port of the TCU is also provided with a voltage analog quantity corresponding to the hydraulic pressure valve 9, so that the voltage value of the hydraulic pressure valve 9 can be detected in real time to determine whether the hydraulic pressure valve 9 is in a normal working state. Therefore, when the P gear executing device fails, whether the hydraulic pressure valve 9 and the position sensor 4 fail or not can be rapidly detected, if the position sensor 4 fails, the TCU can also judge whether the locking valve 1 fails to lock according to the information fed back by the position sensor 4, so that the diagnosis of the failure is facilitated, and a corresponding automatic solving method is made according to the corresponding failure.
Specifically, the voltage analog quantity of the TCU port has a range corresponding to the pressure value of the position sensor 4 or the hydraulic pressure valve 9, and when the pressure value is stabilized within this range, the TCU determines that the voltage is normal, thereby determining that the operation state of the position sensor 4 or the hydraulic pressure valve 9 is normal. When the range is exceeded or fluctuation occurs within the range, the TCU determines that the voltage is abnormal, and thus the position sensor 4 or the hydraulic pressure valve 9 is malfunctioning. When the TCU determines that the position sensor 4 has no fault, but the position value of the shift lever 2 fed back to the TCU by the position sensor 4 is problematic, the malfunction of the lock valve 1 can be determined, and the discrimination logic is simple and accurate.
The present embodiment also provides a processing method when the P-gear executing device fails, as shown in fig. 2, where the processing method includes the following steps:
s10, the TCU can be combined with the P gear real-time position fed back by the position sensor 4, the voltage value of the hydraulic pressure valve 9, the driver instruction and the vehicle speed to carry out fault diagnosis;
and S20, displaying the fault type by the instrument, and controlling the hydraulic pressure valve 9 by the TCU according to the fault type and the driver instruction so as to enable the hydraulic pressure to be combined with the elasticity of the elastic piece 5 to perform fault treatment. The processing method for the P gear executing device when faults occur can solve the problem that if the P gear faults occur when the vehicle stops, the P gear of the vehicle can be prevented from being out; when the vehicle has a P gear fault, but needs to emergent P gear moving vehicles, the vehicle can drive in the P gear under the premise of ensuring safety; in the high-speed state of the vehicle, the accident that the vehicle is mistakenly engaged into the P gear is prevented, and the safety of the vehicle is improved.
Specifically, as shown in fig. 3, when the vehicle runs at a low speed, optionally, the vehicle speed is lower than 3km/h, after the driver sends an instruction to enter the P gear, the P gear entering fault occurs when the vehicle executes the P gear entering scheme, and the P gear executing device fault processing method comprises the following steps:
s110, the TCU judges whether the position sensor 4 is in fault or not according to the voltage value of the position sensor 4, if the position sensor 4 is in fault, but the repeated engagement of the P gear fails, optionally, the repeated times are 2 times, and the position of the gear shift lever 2 fed back by the position sensor 4 is always in the NP gear position, then the lock valve 1 is judged to be in fault;
s120, when the position sensor 4 fails and the locking valve 1 does not fail, executing an open loop control scheme to enable the vehicle to smoothly enter the P gear, and simultaneously controlling an instrument panel by the TCU to display the failure of the position sensor 4;
s130, executing a valve flushing scheme when the position sensor 4 is not faulty but the locking valve 1 is faulty, so that the vehicle normally enters into the P gear;
and S140, if the valve flushing scheme fails, the TCU judges whether the hydraulic pressure valve 9 fails according to the voltage value of the hydraulic pressure valve 9, if the hydraulic pressure valve 9 fails, the TCU control instrument displays the hydraulic valve failure, otherwise, the TCU displays the locking valve 1 failure.
It should be noted that, in order to ensure the safety of the vehicle and the safety of the driver, if the vehicle satisfies the P-in state as long as the P-gear executing device fails to engage, the TCU controls the electronic parking brake system (Electrical Park Brake, EPB) to be turned on, so that the vehicle is normally parked.
When the P gear executing device has no fault, after the driver sends the instruction of hanging in the P gear, the TCU also controls the EPB to be automatically started after the P gear executing device executes the instruction of hanging in the P gear, and when one parking measure is out of order, the other parking measure can ensure that the vehicle is parked, so that the risk of parking failure is reduced on the basis of dual parking of manual parking and electronic parking, and the personal safety of the vehicle and the driver is ensured.
Further, describing the open loop control scheme in detail, the open loop control scheme includes the steps of:
s121, the TCU controls the locking valve 1 to be opened and controls the hydraulic pressure valve 9 to be closed, so that the gear shift lever 2 can only move rightwards by leaning against the elastic force of the elastic piece 5;
s122, the elastic piece 5 drives the gear shift lever 2 to move rightwards so that the gear shift lever 2 moves from the position where the NP-type gear shift slot is aligned with the locking valve 1 to the position where the P-type gear shift slot is aligned with the locking valve 1, and at the moment, the TCU controls the locking valve 1 to be closed, so that the locking valve 1 abuts against the P-type gear shift slot to finish the P-type gear shift instruction.
Simple structure, simple operation logic, easy programming and accurate control.
Further, the valve-flushing scheme is specifically described, and the valve-flushing scheme includes the following steps:
s131, the TCU opens the hydraulic pressure valve 9, and controls the pressure output of the hydraulic pressure valve 9 to be a pressure value balanced with the elastic piece 5 when the gear lever 2 is positioned in the NP gear position;
and S132, executing a P gear engaging instruction after switching the locking valve 1 on and off back and forth for three times, if the P gear engaging is successful, the valve flushing scheme is successful, otherwise, closing the hydraulic pressure valve 9 and no longer executing the valve flushing scheme.
As shown in fig. 4, when the vehicle runs at a high speed, alternatively, the vehicle speed is higher than 3km/h, and an unexpected movement failure of the shift lever 2 from the NP position to the P position occurs, that is, when the position sensor 4 feeds back to the TCU that the shift lever 2 position exceeds the position threshold range when the shift lever 2 is in the NP position and moves to the position threshold range when the shift lever is in the P position, it is determined that the shift lever 2 is unexpected to move from the NP position to the P position, and it may be determined that the lock failure of the lock valve 1 cannot occur, and the P-stage executing device failure processing method includes the steps of:
s210, starting an emergency P gear outlet scheme by the TCU;
s220, the TCU control instrument displays the fault of the locking valve 1;
s230, after the driver parks and sends a command of engaging in the P gear, the driver exits the emergency P-out scheme and executes the command of engaging in the P gear.
The emergency P-out scheme can enable the gear shift lever 2 to be stabilized in an NP gear, so that the phenomenon of locking can not occur when a vehicle runs at a high speed, the safety of the vehicle and a driver is guaranteed, the emergency P-out scheme is described, and the emergency P-out scheme comprises the following steps:
s211, starting the hydraulic pressure valve 9 by the TCU, and enabling the hydraulic pressure valve 9 to be normally open;
and S212, the pressure output of the TCU control hydraulic pressure valve 9 is a pressure value when the gear lever 2 is in the NP gear position.
Before a driver parks a vehicle, the hydraulic pressure is utilized to maintain the position of the gear shift lever 2 in the NP gear, the gear shift lever 2 is ensured to be always positioned in the NP position until the driver parks the vehicle and sends a command of hanging in the P gear, the operation logic is simple, the programming is easy, and the control is accurate.
As shown in fig. 5, when the driver sends a command to exit from the P-gear to enter the NP-gear, a P-gear to enter the NP-gear failure occurs, and the processing method when the P-gear executing device fails includes the steps of:
s310, the TCU judges whether the position sensor 4 is faulty according to the pressure value of the position sensor 4. If the position sensor 4 has no fault, when executing the instruction of exiting the P gear to enter the NP gear for multiple times, optionally, executing the instruction twice, and judging that the locking valve 1 has fault or the hydraulic pressure valve 9 has normally closed fault if the position threshold value of the gear lever 2 fed back to the TCU by the position sensor 4 is not in the NP position threshold value all the time;
s320, if the position sensor 4 fails, the P-gear instruction is not executed, and the instrument displays the failure of the position sensor 4;
s330, if the position sensor 4 has no fault, the TCU displays that the gear shift lever 2 reaches the NP gear position threshold value and then returns to the P gear position threshold value through the data transmitted by the position sensor 4, and the multiple attempts are still the same, alternatively, the number of attempts is two, the P gear instruction is not executed again, and the TCU controls the instrument to display that the locking valve 1 has fault, otherwise, the hydraulic pressure valve 9 has normally closed fault;
and S340, if the instrument displays that the driver still sends an instruction for exiting the P gear after the fault, and when the number of times exceeds the threshold value, optionally, the threshold value of the number of times is 4, starting an emergency P-gear exiting scheme, enabling the vehicle to exit the P gear through hydraulic pressure and maintain in the NP gear until the driver parks and hangs in the P gear, exiting the emergency P-gear exiting scheme, and executing the instruction for hanging in the P gear.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (7)

1. The fault processing method of the P gear executing device is characterized by comprising the following steps of:
s10, the TCU is combined with the P gear real-time position, the state of a position sensor (4), a driver instruction and the vehicle speed to diagnose the fault type;
s20, displaying the fault type by an instrument, and controlling a hydraulic pressure valve (9) by the TCU according to the fault type and a driver instruction so as to enable the hydraulic pressure to be combined with the elasticity of the elastic piece (5) to carry out fault emergency treatment;
the P gear executing device fault processing method comprises the following steps of:
s110, judging that the position sensor (4) is failed or the locking valve (1) is failed;
s120, when the position sensor (4) fails and the locking valve (1) does not fail, executing an open loop control scheme to enable the vehicle to smoothly enter a P gear, and displaying corresponding failure by an instrument;
s130, executing a valve flushing scheme when the locking valve (1) fails and the position sensor (4) does not fail, so that the vehicle normally enters a P gear;
s140, if the valve flushing scheme fails, the instrument displays a corresponding fault;
the fault processing method of the P-gear executing device comprises the following steps of:
s121, controlling the locking valve (1) to be opened, and controlling the hydraulic pressure valve (9) to be closed;
s122, an elastic piece (5) drives a gear shift lever (2) to enter the P gear, and controls the locking valve (1) to be closed;
the valve flushing scheme comprises the following steps of:
s131, starting the hydraulic pressure valve (9), and controlling the pressure output of the hydraulic pressure valve (9) to be a pressure value balanced with the elastic piece (5) when the gear lever (2) is positioned in the NP gear;
and S132, executing a P gear engaging instruction after switching the locking valve (1) back and forth for three times, if the P gear engaging is successful, the valve flushing scheme is successful, otherwise, the valve flushing scheme fails, and the hydraulic pressure valve (9) is closed.
2. The P-gear executing device failure processing method according to claim 1, characterized in that when unexpected slipping of the shift lever (2) from the NP-gear into the P-gear failure occurs when the vehicle speed is higher than a predetermined threshold, the P-gear executing device failure processing method includes the steps of:
s210, starting an emergency P gear outlet scheme;
s220, displaying corresponding faults by the instrument;
s230, after the driver parks and sends a command of engaging in the P gear, the driver exits the emergency P-out scheme and executes the command of engaging in the P gear.
3. The P-gear executing device failure processing method according to claim 2, wherein the emergency P-out scheme includes the steps of:
s211, starting the hydraulic pressure valve (9) and enabling the hydraulic pressure valve (9) to be normally opened;
and S212, controlling the pressure output of the hydraulic pressure valve (9) to be a pressure value when the gear lever (2) is positioned in the NP gear.
4. The P-gear executing device failure processing method according to claim 2, characterized in that when a shift-in P-gear failure from the NP-gear of the shift lever (2) occurs, the P-gear executing device failure processing method includes the steps of:
s310, judging that the position sensor (4) is failed or the locking valve (1) is failed;
s320, if the position sensor (4) fails but the locking valve (1) is not failed, the P-gear instruction is not executed, and the instrument displays related faults;
s330, if the fault position sensor (4) of the locking valve (1) is not faulty, the P-gear instruction is not executed, and the instrument displays related faults;
and S340, if the instrument displays that the fault is caused, the driver still sends a P gear pushing instruction, and when the number of times exceeds a threshold value, the emergency P gear pushing scheme is started until the driver stops and hangs in the P gear, the emergency P gear pushing scheme is exited, and the P gear hanging instruction is executed.
5. A P-gear executing device, characterized by being configured to implement the P-gear executing device failure processing method according to any one of claims 1 to 4, comprising:
the hydraulic cylinder is internally provided with hydraulic oil;
a hydraulic pressure valve (9) communicated with the hydraulic cylinder, wherein the hydraulic pressure valve (9) is electrically connected with a TCU, and the TCU can control the opening and closing of the hydraulic pressure valve (9) and the oil pressure;
a shift hydraulic cylinder (7);
the piston (6) is movably arranged in the gear shifting hydraulic cylinder (7);
one end of the gear shift lever (2) is provided with a P gear slot and an NP gear slot, and the other end of the gear shift lever is connected with the piston (6);
an elastic piece (5) which is arranged in the gear shifting hydraulic cylinder (7), one end of the elastic piece is abutted against the gear shifting hydraulic cylinder (7), the other end of the elastic piece is abutted against the piston (6), and the hydraulic pressure valve (9) is communicated with one side, far away from the elastic piece (5), of the gear shifting hydraulic cylinder (7);
the locking valve (1) is matched with the P blocking groove or the NP blocking groove to limit the position of the gear lever (2), the locking valve (1) is electrically connected with the TCU, and the TCU can control the opening and closing of the locking valve (1).
6. The P-gear executing device according to claim 5, further comprising:
the position sensor (4) is arranged on the transmission, the position sensor (4) is configured to detect the position of the gear shift lever (2), the position sensor (4) is electrically connected with the TCU, the TCU can detect the position of the gear shift lever (2) through the position sensor (4) in real time, and the TCU can detect the voltage value of the position sensor (4) in real time to judge the state of the position sensor (4).
7. The P-gear executing device according to any one of claims 5 to 6, further comprising:
and the throttle valve (8) is communicated with a hydraulic oil path between the hydraulic pressure valve (9) and the gear shifting hydraulic cylinder (7).
CN202210734629.3A 2022-06-27 2022-06-27 P-gear executing device fault processing method and P-gear executing device Active CN115163824B (en)

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