CN115503470A - Power takeoff control method and device - Google Patents
Power takeoff control method and device Download PDFInfo
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- CN115503470A CN115503470A CN202211243824.2A CN202211243824A CN115503470A CN 115503470 A CN115503470 A CN 115503470A CN 202211243824 A CN202211243824 A CN 202211243824A CN 115503470 A CN115503470 A CN 115503470A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K25/00—Auxiliary drives
- B60K25/06—Auxiliary drives from the transmission power take-off
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Human Computer Interaction (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
The invention relates to the field of vehicle power takeoff devices, and discloses a power takeoff device control method and device. The power takeoff control method provided by the method can be used for carrying out parking power takeoff or driving power takeoff according to different prepositive conditions and triggering conditions, and the method effectively avoids unnecessary mechanical damage of the power takeoff caused by misoperation of a driver; when the power takeoff is in a driving power takeoff working state, the current gear of the gearbox is calculated in real time, and if the current gear does not accord with a preset gear, a fault alarm is given out, so that the method avoids unnecessary mechanical damage caused by the fact that the power takeoff works in an abnormal gear of the gearbox for a long time; when the power takeoff is in the working process, the emergency exit operation triggered by a driver is received, the power takeoff performs the exit operation, and stops working.
Description
Technical Field
The invention relates to the field of vehicle power takeoff, in particular to a power takeoff control method and device.
Background
At present, in the field of commercial trucks, power takeoff devices are arranged aiming at dump trucks, garbage transport vehicles, watering lorries and other vehicle types, and are responsible for providing power sources for loading equipment (such as carriage lifting devices, water pumps, oil pumps and the like). The power takeoff is generally arranged at the rear side of the gearbox and obtains power from a certain gear of the gearbox, and the power is generally switched on and off by controlling the on-off of an air passage through an electromagnetic air valve to realize the engagement and the separation of a gear mechanism so as to realize the on-off of the power.
To manual gear gearbox motorcycle type, the electric control scheme of taking at present all is by switch direct control solenoid valve, and there are many drawbacks in this kind of scheme, if: 1. the system has no closed loop feedback, and a driver cannot know the real working state of the power takeoff after a power takeoff switch is pressed down; 2. the power takeoff is started and quitted without protective measures, the power takeoff is operated subjectively by a driver, and the gearbox is easily damaged by misoperation; 3. when the power is taken off during driving, the power takeoff is only allowed to work in a set gear, and the power takeoff is not allowed to work in other gears, so that reminding cannot be realized by the conventional scheme. Further improvements are needed in the electrical control schemes currently being adopted.
Disclosure of Invention
The invention provides a power takeoff control method and a power takeoff control device, which can effectively reduce unnecessary mechanical damage caused by misoperation of a power takeoff by a driver and can meet the working requirement of emergency shutdown of the power takeoff.
In order to solve the above technical problem, a first embodiment of the present invention provides a power takeoff control method, including:
when a power takeoff request switch short-pressing signal is received, the whole vehicle condition is detected;
if the condition of the whole vehicle meets the power takeoff precondition, controlling a power takeoff electromagnetic valve in the power takeoff to be electrified and starting power takeoff work; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition;
in the process of power take-off, if an exit signal is received, the current power take-off mode is judged;
if the current power take-off mode is power take-off during traveling, controlling a traveling power take-off electromagnetic valve to be powered off so as to stop the power take-off;
and if the current power takeoff mode is parking power takeoff, controlling the parking power takeoff electromagnetic valve and the traveling power takeoff electromagnetic valve to be electrified and powered off so as to stop the power takeoff.
The power takeoff control method provided by the invention detects the condition of the whole vehicle when receiving a power takeoff request switch short-pressing signal, performs power takeoff when meeting the power takeoff precondition, judges the current power takeoff mode if receiving a quit signal in the power takeoff process, and performs different quit operations according to different power takeoff modes. The method can effectively avoid unnecessary mechanical damage of the power takeoff caused by misoperation of a driver, and can meet the working requirement of emergency shutdown of the power takeoff while reducing misoperation as much as possible.
Further, if the whole vehicle condition meets the power take-off precondition, a power take-off electromagnetic valve in the power take-off is controlled to be electrified to start power take-off work, and the power take-off precondition control method specifically comprises the following steps:
when the condition of the whole vehicle meets the preposed condition of the power take-off of the vehicle, controlling a power take-off electromagnetic valve in the power take-off to be electrified and starting the power take-off of the vehicle;
and when the condition of the whole vehicle meets the parking power take-off precondition, controlling a parking power take-off solenoid valve and a driving power take-off solenoid valve in the power take-off to be electrified, and starting parking power take-off work.
The power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition, and different power take-off modes can be selected according to different preconditions. The method can select the power taking mode according to local conditions, so that the power taking device can be effectively used, and the damage is reduced.
Further, after the start of the driving power take-off work, the method further comprises the following steps:
calculating the current gear of the gearbox in the driving power taking process;
and when the current gear of the gearbox does not accord with the preset driving power takeoff working gear, performing fault alarm and sending a fault signal to the instrument.
According to the method, when the power takeoff is in a driving power takeoff working state, the current gear of the gearbox is calculated in real time, and if the current gear does not accord with the preset gear, fault alarm is given out, so that unnecessary mechanical damage caused by long-time working of the power takeoff on the abnormal gear of the gearbox is avoided.
Further, in the driving power take-off process, the current gear of the gearbox is calculated, specifically:
acquiring real-time rotating speed fed back by an output shaft rotating speed sensor and rotating speed fed back by an engine;
calculating the transmission ratio of the current gear according to the rotating speed of an output shaft of the gearbox and the rotating speed of an engine;
confirming a gear corresponding to the current gear transmission ratio through a gear transmission ratio-gear relation table of the vehicle;
wherein the current gear ratio = gearbox output shaft speed/engine speed.
The invention provides a method for calculating the current gear of a gearbox, which is characterized in that the current gear of the gearbox is calculated by acquiring the real-time rotating speed fed back by an output shaft rotating speed sensor and the rotating speed fed back by an engine, wherein the gear transmission ratio = the rotating speed of the output shaft of the gearbox/the rotating speed of the engine, and the gear corresponding to the current gear transmission ratio is confirmed by a gear transmission ratio-gear relation table of a vehicle.
Further, the detecting of the vehicle condition specifically includes:
and detecting the ON gear state of the whole vehicle, the rotating speed of an engine, the speed of the vehicle, the air pressure of the whole vehicle, the state of a gear shifting handle, the state of a hand brake, the clutch state and the state of a power takeoff working state feedback switch.
Further, the whole vehicle condition meets the front-end condition of the power takeoff of the vehicle, and specifically comprises the following steps:
when the state of the whole vehicle ON gear is an effective state, the engine speed is in a power take-off speed interval, the vehicle speed is in a driving power take-off speed interval, the whole vehicle air pressure is in a power take-off air pressure interval, the gear shifting handle is in a neutral position, the hand brake is in a non-pull-up state, the clutch is in a switch closing state, and the power take-off working state feedback switch is invalid, the whole vehicle condition is determined to meet the driving power take-off precondition;
otherwise, determining that the whole vehicle condition does not meet the power take-off precondition of the running vehicle.
Further, the whole vehicle condition meets the parking power take-off precondition, and the parking power take-off precondition comprises the following specific steps:
when the state of the whole vehicle ON gear is an effective state, the engine speed is in a power take-off speed interval, the vehicle speed is in a parking power take-off speed interval, the whole vehicle air pressure is in a power take-off air pressure interval, the gear shifting handle is in a neutral position, the hand brake is in a pull-up state, the clutch is in a switch closed state, and the power take-off working state feedback switch is invalid, the whole vehicle condition is determined to meet the driving power take-off precondition;
and otherwise, determining that the finished vehicle condition does not meet the parking power take-off precondition.
Further, in the power take-off process, if an exit signal is received, the method specifically includes:
the exit signals comprise normal exit signals and emergency exit signals;
the specific step of receiving the normal exit signal is that a power takeoff request switch short-time pressing signal is received in the power takeoff process;
the received emergency exit signal specifically means that more than 2 power takeoff request switch short-time pressing signals are received in 1S in the power takeoff process;
or receiving a power takeoff request switch long-press signal in the power takeoff process.
The exit signal comprises a normal exit signal and an emergency exit signal, wherein in the power taking process, the received power takeoff request switch short pressing signal is the normal exit signal, in the power taking process, more than 2 power takeoff request switch short pressing signals are received in 1S or the received power takeoff request switch long pressing signal is the emergency exit signal, and the method sends a push-out signal through different triggering modes so as to timely feed back the exit operation triggered by a driver for safety consideration or the current situation, timely cope with the emergency situation and protect the life safety of personnel.
The power takeoff control method provided by the invention can be used for carrying out parking power takeoff or driving power takeoff according to different prepositive conditions and triggering conditions, and the method effectively avoids unnecessary mechanical damage of the power takeoff caused by misoperation of a driver; when the power takeoff is in a driving power takeoff working state, the current gear of the gearbox is calculated in real time, if the current gear does not accord with a preset gear, fault alarm is carried out, and the method avoids unnecessary mechanical damage caused by the fact that the power takeoff works in an abnormal gear of the gearbox for a long time; when the power takeoff receives an emergency exit operation triggered by a driver in the working process, the power takeoff performs the exit operation and stops working.
Accordingly, the present invention provides a power takeoff control device comprising: the device comprises a detection module, a first control module, a judgment module, a second control module and a third control module;
the detection module is used for detecting the condition of the whole vehicle when receiving a power takeoff request switch short-pressing signal;
the first control module is used for controlling a power take-off electromagnetic valve in the power take-off device to be electrified and starting power take-off work if the condition of the whole vehicle meets a power take-off precondition; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition;
the judging module judges the current force taking mode if receiving an exit signal in the force taking process;
if the current power take-off mode is the power take-off mode of the travelling crane, the second control module controls the power take-off electromagnetic valve of the travelling crane to be powered off so as to stop the power take-off device;
and if the current power take-off mode is parking power take-off, the third control module controls the parking power take-off solenoid valve and the traveling power take-off solenoid valve to be powered on and powered off so as to stop the power take-off.
Further, the first control module includes: a first judgment unit and a second judgment unit;
the first judgment unit is used for controlling a driving power take-off electromagnetic valve in the power take-off to be electrified and starting driving power take-off work when the whole vehicle condition meets the driving power take-off precondition;
and the second judgment unit is used for controlling the power take-off solenoid valve and the driving power take-off solenoid valve in the power take-off device to be electrified to start the power take-off operation when the condition of the whole vehicle meets the parking power take-off precondition.
The invention provides a power takeoff control device, which is based on organic combination among modules, can effectively reduce unnecessary mechanical damage caused by misoperation of a power takeoff by a driver or the fact that a transmission case of the power takeoff works for a long time is in an abnormal gear, and can meet the working requirement of emergency shutdown of the power takeoff.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a method for controlling a power take-off provided by the present invention;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a method for controlling a power take-off provided by the present invention;
FIG. 3 is a schematic flow chart illustrating a method of controlling a power take-off according to yet another embodiment of the present invention;
FIG. 4 is a flowchart illustrating an exemplary exit signal according to the present invention;
FIG. 5 is a schematic diagram of an embodiment of a power take-off control apparatus according to the present invention;
fig. 6 is a schematic diagram of a power takeoff control system provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of an embodiment of a power takeoff control method provided by the present invention, the method includes steps 101 to 105, and the steps are as follows:
step 101: and when a power takeoff request switch short-pressing signal is received, the condition of the whole vehicle is detected.
In the embodiment of the invention, the condition of the whole vehicle is detected, and the method specifically comprises the following steps:
and detecting the ON gear state of the whole vehicle, the rotating speed of an engine, the speed of the vehicle, the air pressure of the whole vehicle, the state of a gear shifting handle, the state of a hand brake, the clutch state and the state of a power takeoff working state feedback switch.
Step 102: if the condition of the whole vehicle meets the power take-off precondition, controlling a power take-off electromagnetic valve in the power take-off to be electrified and starting power take-off work; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition.
In the embodiment of the present invention, if the situation of the whole vehicle meets the power take-off precondition, the power take-off solenoid valve in the power take-off is controlled to be energized to start power take-off operation, which specifically includes:
when the condition of the whole vehicle meets the preposed condition of the power take-off of the vehicle, controlling a power take-off electromagnetic valve in the power take-off to be electrified and starting the power take-off of the vehicle;
when the condition of the whole vehicle meets the parking power take-off precondition, a parking power take-off electromagnetic valve and a driving power take-off electromagnetic valve in the power take-off are controlled to be electrified, and the parking power take-off work is started.
In the embodiment of the invention, the condition of the whole vehicle meets the preposition condition of the power take-off of the driving, which specifically comprises the following steps:
when the state of the ON gear of the whole vehicle is an effective state, the rotating speed of an engine is in a power take-off rotating speed range, the vehicle speed is in a driving power take-off vehicle speed range, the air pressure of the whole vehicle is in a power take-off air pressure range, a gear shifting handle is in a neutral position, a hand brake is in a non-pull-up state, a clutch is in a switch closing state, and a power take-off working state feedback switch is invalid, determining that the condition of the whole vehicle meets the driving power take-off precondition;
otherwise, determining that the whole vehicle condition does not meet the power take-off precondition of the running vehicle.
As an example of this embodiment, in the precondition of driving power take-off, the power take-off speed interval is preset to be 400-700rmp interval to ensure that the engine is started and is at idle speed; the driving power take-off speed interval is preset to be 10-20 Km/h; the pressure-taking air pressure interval is preset to be 0.7-1 MPa.
In the embodiment of the invention, when the driving precondition is met, the power takeoff controller controls the driving power takeoff electromagnetic valve to be electrified, high-pressure gas is introduced into the power takeoff cylinder to push the power takeoff to engage a gear, the power takeoff is meshed with a gear of a gearbox, a gear shifting handle is engaged into a low-speed gear to be operated, a clutch pedal is slowly lifted, and the gearbox is connected with an engine, so that the power of the whole vehicle is transmitted to the power takeoff.
In the embodiment of the invention, the condition of the whole vehicle meets the parking power take-off precondition, and the parking power take-off precondition comprises the following specific steps:
when the state of the ON gear of the whole vehicle is an effective state, the rotating speed of an engine is in a power take-off rotating speed range, the vehicle speed is in a parking power take-off vehicle speed range, the air pressure of the whole vehicle is in a power take-off air pressure range, a gear shifting handle is in a neutral position, a hand brake is in a pull-up state, a clutch is in a switch closed state, and a power take-off working state feedback switch is invalid, determining that the condition of the whole vehicle meets the power take-off precondition of the running;
and otherwise, determining that the finished vehicle condition does not meet the parking power take-off precondition.
As an example of the embodiment, in the precondition of parking power take-off, the power take-off rotating speed interval is preset to be 400-700rmp interval to ensure that the engine is started and is at idle speed; the parking power take-off vehicle speed interval is preset to be less than 1Km/h interval; the pressure-taking air pressure interval is preset to be 0.7-1 MPa.
In the embodiment of the invention, when the parking power take-off precondition is met, the power take-off controller controls the parking power take-off electromagnetic valve and the driving power take-off electromagnetic valve to be electrified. High-pressure gas is introduced into a power takeoff cylinder to push the power takeoff to engage with a gear, and the power takeoff is meshed with a gear of a gearbox; meanwhile, high-pressure gas enters the auxiliary box of the gearbox to push the auxiliary box to be hung in a neutral gear, and at the moment, the main box of the gearbox does not output power any more. And then the gear shifting handle is engaged into a low-speed gear to be operated, so that the power of the engine is output to the power takeoff and is not output to the main box of the gearbox any more, the gearbox can not transmit the power to the transmission shaft, and the whole vehicle can not have a power source and can be kept static.
Step 103: and in the process of power taking, if an exit signal is received, judging the current power taking mode.
In the embodiment of the present invention, as shown in fig. 4, the receiving of the exit signal specifically includes:
the exit signal comprises a normal exit signal and an emergency exit signal;
the received normal exit signal specifically means that a power takeoff request switch short-press signal is received in the power takeoff process;
the step of receiving the emergency exit signal specifically means that more than 2 power takeoff request switch short-time pressing signals are received in 1S in the power takeoff process;
or receiving a power takeoff request switch long-pressing signal in the power takeoff process.
As an example of this embodiment, the power takeoff request switch triggering time is less than 0.5S, and then the power takeoff request switch short-pressing signal is output, and the power takeoff request switch triggering time is greater than 1S, then the power takeoff request switch long-pressing signal is output.
Step 104: and if the current power takeoff mode is the driving power takeoff mode, controlling the driving power takeoff electromagnetic valve to be powered off so as to stop the power takeoff.
Step 105: and if the current power takeoff mode is parking power takeoff, controlling the parking power takeoff electromagnetic valve and the traveling power takeoff electromagnetic valve to be electrified and powered off so as to stop the power takeoff.
In the embodiment of the invention, when the quit signal is received and the quit condition is met, the power takeoff controller controls the power-off of the driving power takeoff electromagnetic valve and the parking power takeoff electromagnetic valve, gas stops flowing into the power takeoff cylinder and the auxiliary box cylinder, the power takeoff is shifted, the power takeoff and a gear of a gearbox are disconnected, and the power takeoff stops working.
In the embodiment of the present invention, as shown in fig. 2, after the driving power take-off operation is started, the method further includes step 201 and step 202, specifically:
step 201: and in the driving power take-off process, calculating the current gear of the gearbox.
Step 202: and when the current gear of the gearbox does not accord with the preset driving power takeoff working gear, performing fault alarm and sending a fault signal to the instrument.
In the embodiment of the present invention, as shown in fig. 3, step 201 includes steps 301 to 303, and each step is specifically as follows:
step 301: and acquiring the real-time rotating speed fed back by the output shaft rotating speed sensor and the rotating speed fed back by the engine.
Step 302: and calculating the transmission ratio of the current gear according to the rotating speed of the output shaft of the gearbox and the rotating speed of the engine.
Step 303: confirming a gear corresponding to the current gear transmission ratio through a gear transmission ratio-gear relation table of the vehicle;
wherein the current gear ratio = gearbox output shaft speed/engine speed.
In the embodiment of the invention, the power takeoff is only allowed to work at the low gear of the gearbox, so the preset driving power take-off working gear is 1 gear or 2 gears, and if the calculated current gear of the gearbox does not accord with the preset driving power take-off working gear, the power takeoff controller signals the instrument, and the instrument pops the window to remind that the power takeoff works at an abnormal gear and requires immediate parking confirmation. The gear ratio-gear relation table is written by a diagnostic instrument when the vehicle is off-line.
Correspondingly, as shown in fig. 5, the device is a schematic structural diagram of an embodiment of the power takeoff control device provided by the present invention, and the device includes a detection module 401, a first control module 402, a determination module 403, a second control module 404, and a third control module 405;
the detection module 401 is used for detecting the whole vehicle condition when receiving a power takeoff request switch short-time pressing signal;
the first control module 402 is used for controlling a power take-off solenoid valve in the power take-off device to be electrified and starting power take-off work if the condition of the whole vehicle meets the power take-off precondition; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition; judging the current force taking mode;
if the current power take-off mode is the power take-off mode in a traveling crane, the second control module 404 controls the power take-off electromagnetic valve to be powered off so that the power take-off stops working;
if the current power take-off mode is parking power take-off, the third control module 405 controls the parking power take-off solenoid valve and the traveling power take-off solenoid valve to be powered on and powered off so that the power take-off stops working.
In an embodiment of the present invention, the first control module 402 comprises: a first judgment unit and a second judgment unit;
the first judgment unit is used for controlling a driving power take-off electromagnetic valve in the power take-off to be electrified and starting driving power take-off work when the condition of the whole vehicle meets the driving power take-off precondition;
and the second judgment unit is used for controlling the power take-off solenoid valve and the driving power take-off solenoid valve in the power take-off to be electrified to start the power take-off operation when the condition of the whole vehicle meets the parking power take-off precondition.
In this embodiment, as shown in fig. 6, the components of the power takeoff control system include ON gear signals, transmission gear ratio signals of a transmission gear, engine speed signals, transmission output shaft speed signals, vehicle air pressure signals, hand brake signals, a neutral switch, a reverse switch, a clutch switch, a power takeoff controller, a power takeoff solenoid valve, a power takeoff working state feedback switch, and the like. The power takeoff working state feedback switch signal is output by the power takeoff working state feedback switch, and a low level signal is output when the power takeoff is in a working state; the transmission ratio signals of the gears of the gear box are uniformly written in by flashing when the vehicles are off line, and are uniquely determined by the configuration of the gear box of each vehicle; the ON gear signal is output by the gear distribution of the key of the whole vehicle; the required engine rotating speed signal is sent by an engine ECU through a CAN message; the required rotating speed of an output shaft of the gearbox, the speed, the air pressure of the whole vehicle and a hand brake signal are sent by an instrument through a CAN message; the neutral gear switch signal and the reverse gear switch signal are hard-line signals output by a neutral gear switch and a reverse gear switch of the manual transmission; the clutch switch signal is a hard wire signal output by a clutch pedal switch; the power takeoff request switch signal is output by the power takeoff request switch as a hard-line signal.
In summary, the power takeoff control method and device provided by the embodiment of the invention can perform parking power takeoff or driving power takeoff according to different precondition and triggering conditions, and the invention effectively avoids unnecessary mechanical damage of the power takeoff caused by misoperation of a driver; when the power takeoff is in a driving power takeoff working state, the current gear of the gearbox is calculated in real time, and if the current gear does not accord with a preset gear, a fault alarm is given out, so that unnecessary mechanical damage caused by the fact that the power takeoff works in an abnormal gear of the gearbox for a long time is avoided; when the power takeoff receives the emergency exit operation triggered by a driver in the working process, the power takeoff performs the exit operation and stops working.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of controlling a power take-off, comprising:
when a power takeoff request switch short-pressing signal is received, the whole vehicle condition is detected;
if the condition of the whole vehicle meets the power takeoff precondition, controlling a power takeoff electromagnetic valve in the power takeoff to be electrified and starting power takeoff work; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition;
in the process of power take-off, if an exit signal is received, the current power take-off mode is judged;
if the current power take-off mode is power take-off during traveling, controlling a traveling power take-off electromagnetic valve to be powered off so as to stop the power take-off;
if the current power take-off mode is parking power take-off, the parking power take-off electromagnetic valve and the driving power take-off electromagnetic valve are controlled to be powered on and powered off, so that the power take-off stops working.
2. The power takeoff control method according to claim 1, wherein if the vehicle condition satisfies a power takeoff precondition, a power takeoff solenoid valve in the power takeoff is controlled to be energized to start power takeoff operation, specifically:
when the condition of the whole vehicle meets the preposed condition of the power take-off of the vehicle, controlling a power take-off electromagnetic valve in the power take-off to be electrified and starting the power take-off of the vehicle;
when the condition of the whole vehicle meets the parking power take-off precondition, a parking power take-off electromagnetic valve and a driving power take-off electromagnetic valve in the power take-off are controlled to be electrified, and the parking power take-off work is started.
3. The power takeoff control method as claimed in claim 2, further comprising, after the start of the traveling power take-off operation:
calculating the current gear of the gearbox in the driving power take-off process;
and when the current gear of the gearbox does not accord with the preset driving power takeoff working gear, performing fault alarm and sending a fault signal to the instrument.
4. The power takeoff control method according to claim 3, wherein during a driving power takeoff, a current gear of a transmission is calculated, specifically:
acquiring real-time rotating speed fed back by an output shaft rotating speed sensor and rotating speed fed back by an engine;
calculating the transmission ratio of the current gear according to the rotating speed of an output shaft of the gearbox and the rotating speed of an engine;
confirming a gear corresponding to the current gear transmission ratio through a gear transmission ratio-gear relation table of the vehicle;
wherein the current gear ratio = gearbox output shaft speed/engine speed.
5. The power takeoff control method according to any one of claims 1 to 4, wherein the detecting of the condition of the entire vehicle is specifically:
and detecting the ON gear state of the whole vehicle, the rotating speed of an engine, the speed of the vehicle, the air pressure of the whole vehicle, the state of a gear shifting handle, the state of a hand brake, the clutch state and the state of a power takeoff working state feedback switch.
6. The power takeoff control method according to claim 5, wherein the vehicle condition satisfies a driving power takeoff precondition, and specifically comprises:
when the state of the whole vehicle ON gear is an effective state, the engine speed is in a power take-off speed interval, the vehicle speed is in a driving power take-off speed interval, the whole vehicle air pressure is in a power take-off air pressure interval, the gear shifting handle is in a neutral position, the hand brake is in a non-pull-up state, the clutch is in a switch closing state, and the power take-off working state feedback switch is invalid, the whole vehicle condition is determined to meet the driving power take-off precondition;
otherwise, determining that the whole vehicle condition does not meet the power take-off precondition of the running vehicle.
7. The power takeoff control method according to claim 5, wherein the entire vehicle condition satisfies a parking power takeoff precondition, specifically:
when the state of the ON gear of the whole vehicle is an effective state, the rotating speed of an engine is in a power take-off rotating speed range, the vehicle speed is in a parking power take-off vehicle speed range, the air pressure of the whole vehicle is in a power take-off air pressure range, a gear shifting handle is in a neutral position, a hand brake is in a pull-up state, a clutch is in a switch closed state, and a power take-off working state feedback switch is invalid, determining that the condition of the whole vehicle meets the power take-off precondition of the running;
otherwise, determining that the finished vehicle condition does not meet the parking power takeoff precondition.
8. The power takeoff control method according to claim 1, wherein, if an exit signal is received during power takeoff, the method specifically comprises:
the exit signal comprises a normal exit signal and an emergency exit signal;
the specific step of receiving the normal exit signal is that a power takeoff request switch short-time pressing signal is received in the power takeoff process;
the step of receiving the emergency exit signal specifically means that more than 2 power takeoff request switch short-time pressing signals are received in 1S in the power takeoff process;
or receiving a power takeoff request switch long-press signal in the power takeoff process.
9. A power takeoff control device, comprising: the device comprises a detection module, a first control module, a judgment module, a second control module and a third control module;
the detection module is used for detecting the whole vehicle condition when receiving a power takeoff request switch short-time pressing signal;
the first control module is used for controlling a power take-off electromagnetic valve in the power take-off device to be electrified and starting power take-off work if the condition of the whole vehicle meets a power take-off precondition; the power take-off precondition comprises a driving power take-off precondition and a parking power take-off precondition;
the judging module judges the current power taking mode if receiving an exit signal in the power taking process;
if the current power takeoff mode is the driving power takeoff mode, the second control module controls the driving power takeoff electromagnetic valve to be powered off so that the power takeoff stops working;
and if the current power take-off mode is parking power take-off, the third control module controls the parking power take-off electromagnetic valve and the traveling power take-off electromagnetic valve to be powered on and powered off so that the power take-off stops working.
10. The power take-off control device as claimed in claim 9, wherein said first control module comprises: a first judgment unit and a second judgment unit;
the first judgment unit is used for controlling a driving power take-off electromagnetic valve in the power takeoff to be electrified and starting driving power take-off work when the condition of the whole vehicle meets the driving power take-off precondition;
and the second judgment unit is used for controlling the power take-off solenoid valve and the driving power take-off solenoid valve in the power take-off to be electrified to start the power take-off work when the condition of the whole vehicle meets the prepositive parking power take-off condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211243824.2A CN115503470A (en) | 2022-10-11 | 2022-10-11 | Power takeoff control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211243824.2A CN115503470A (en) | 2022-10-11 | 2022-10-11 | Power takeoff control method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115503470A true CN115503470A (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211243824.2A Pending CN115503470A (en) | 2022-10-11 | 2022-10-11 | Power takeoff control method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115503470A (en) |
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2022
- 2022-10-11 CN CN202211243824.2A patent/CN115503470A/en active Pending
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