CN109367390B - Safety control system and method for power takeoff of dump truck - Google Patents

Safety control system and method for power takeoff of dump truck Download PDF

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Publication number
CN109367390B
CN109367390B CN201811109692.8A CN201811109692A CN109367390B CN 109367390 B CN109367390 B CN 109367390B CN 201811109692 A CN201811109692 A CN 201811109692A CN 109367390 B CN109367390 B CN 109367390B
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China
Prior art keywords
power takeoff
rotating speed
engine
safety control
dump truck
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CN109367390A (en
Inventor
程晓东
陈莉
山雪梅
孙明伟
司敏捷
杨成伦
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Sinotruk Qingdao Heavy Industry Co Ltd
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Sinotruk Qingdao Heavy Industry Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT 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
    • B60K25/00Auxiliary drives
    • B60K25/02Auxiliary drives directly from an engine shaft
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q9/00Arrangements or adaptations of signal devices not provided for in one of the preceding main groups, e.g. haptic signalling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT 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
    • B60K25/00Auxiliary drives
    • B60K25/02Auxiliary drives directly from an engine shaft
    • B60K2025/026Auxiliary drives directly from an engine shaft by a hydraulic transmission

Abstract

The invention discloses a safety control system and a method for a power takeoff of a dump truck, wherein the safety control system comprises a power takeoff, a safety control module, a power takeoff control switch, an engine rotating speed sensor, an engine ECU (electronic control unit), an alarm device and a display; the output shaft of the power takeoff is connected with a gear pump of a hydraulic lifting system; and the safety control module is respectively connected with the power takeoff control switch, the alarm device and the display. The safety control system and the method for the power takeoff of the dump truck can ensure the safety of the dump truck in the process of lifting the carriage, can limit the rotating speed of an engine by utilizing the rotating speed of a gear pump of a hydraulic lifting system, and prolong the service life of the dump truck.

Description

Safety control system and method for power takeoff of dump truck
Technical Field
The invention belongs to the technical field of dumper, and particularly relates to a safety control system and method for a dumper power takeoff.
Background
At present, when a driver lifts or descends the dump truck, the electric control switch or the pneumatic control switch of the power takeoff is switched on to drive the hydraulic system to lift or descend the carriage. Manual operation controls are relatively simple, but lack safety and also lack alarm prompts for the occurrence of operational anomalies.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention aims to provide a safety control system and a method for a power takeoff of a dump truck, which can visually reflect the working state of the power takeoff, limit the continuous increase of the rotating speed of an engine, further limit the continuous increase of the rotating speed of the power takeoff, enable the power takeoff to be in a safe operation state, simultaneously have the function of protecting a hydraulic system and prolong the service life of the dump truck.
The invention provides a safety control system for a power takeoff of a dump truck, which comprises a power takeoff, a safety control module, a power takeoff control switch, an engine rotating speed sensor, an engine ECU (electronic control unit), an alarm device and a display, wherein the power takeoff is connected with the safety control module; the input shaft of the power takeoff is connected with a gearbox, the gearbox is connected with an engine, and the output shaft of the power takeoff is connected with a gear pump of a hydraulic lifting system; the safety control module is respectively connected with the power takeoff control switch, the engine ECU, the alarm device and the display;
the engine rotating speed sensor is arranged on an engine blade flywheel and used for acquiring the rotating speed Nf of the engine;
the engine ECU is connected with an engine rotating speed sensor and used for receiving an engine rotating speed Nf;
the safety control module is connected with the engine ECU through a CAN bus and used for receiving the rotating speed Nf of the engine and calculating the rotating speed Nq of the power takeoff;
the safety control module is stored with a power takeoff rotating speed threshold N0 and a gear pump rotating speed threshold N1, and is used for judging whether the power takeoff rotating speed Nq exceeds the power takeoff rotating speed threshold N0 or the gear pump rotating speed threshold N1, and sending a control signal according to the judgment result, wherein the control signal comprises: when the power takeoff rotating speed Nq is smaller than a power takeoff rotating speed threshold value N0, a display screen displays a green signal, the opening degree of a foot accelerator pedal and the rotating speed of an engine are allowed to follow linear change, when the Nq is larger than or equal to N0, the display screen displays a yellow signal, an alarm device gives an alarm, the opening degree of the foot accelerator pedal and the rotating speed of the engine are allowed to follow linear change, when the power takeoff rotating speed Nq is larger than or equal to a gear pump rotating speed threshold value N1, the opening degree of the foot accelerator pedal and the rotating speed of the engine are forbidden to follow linear change, and lifting of a dump truck.
Further, the engine ECU is connected with an accelerator, the accelerator is an electronic accelerator, the engine ECU is connected with the electronic accelerator ECU through a CAN bus, and the electronic accelerator ECU controls the relation between the opening degree of a foot accelerator pedal and the rotating speed of the engine through adjusting a throttle valve.
Further, the formula for calculating the rotation speed Nq of the power takeoff is as follows: nq = Nf I, where Nq is the power take-off speed, Nf is the engine speed, and I is the speed ratio.
Further, the power take-off rotational speed threshold N0 is less than the gear pump rotational speed threshold N1.
Further, the gear pump rotation speed threshold N1 is a rated rotation speed of the gear pump.
Further, the gear pump rotating speed threshold value N1 is a certain rotating speed value which is smaller than the rated rotating speed of the gear pump and is larger than the minimum rotating speed value required by the gear pump.
Further, the safety control module includes: the device comprises a receiving unit, a storage unit, a data analysis unit and a control unit;
the receiving unit is connected with an engine ECU (electronic control Unit) through a CAN (controller area network) bus and used for receiving signals of the rotating speed Nf of the engine;
the receiving unit is connected with the power takeoff control switch and used for collecting power takeoff switching value signals;
the storage unit is connected with the receiving unit and used for storing a power takeoff switching value signal and an engine rotating speed Nf signal;
the data analysis unit is connected with the storage unit and is used for calculating the rotating speed Nq of the power takeoff, judging whether the Nq exceeds a power takeoff rotating speed threshold value N0 or a gear pump rotating speed threshold value N1 or not, and analyzing a power takeoff switching value signal;
the control unit is respectively connected with the data analysis unit, the engine ECU, the alarm device and the display, and is used for sending a control signal according to the judgment result of the data analysis unit.
Furthermore, alarm device and display set up in the driver's cabin, the display is used for showing power takeoff's state, power takeoff rotational speed Nq and state prompt signal.
The invention also provides a method for safely controlling the dumper power takeoff by the dumper power takeoff safety control system, which comprises the following steps of:
(1) stopping the dump truck, carrying out lifting operation, turning on a power takeoff control switch, electrifying a power takeoff electromagnetic valve, turning on the power takeoff, and acquiring a power takeoff switching value signal by a safety control module;
(2) the engine rotating speed sensor detects the rotating speed Nf of the engine and transmits the rotating speed Nf to the safety control module;
(3) the safety control module calculates the rotating speed Nq of the power takeoff through a formula Nq = Nf I, wherein I is a rotating speed ratio;
(4) the safety control module judges whether Nq exceeds a power takeoff rotating speed threshold N0 or a gear pump rotating speed threshold N1, and sends control signals according to the judgment result, wherein the control signals comprise: when Nq is less than N0, the display screen displays a green signal, and the opening degree of the foot accelerator pedal and the engine speed are allowed to follow linear change; when Nq is greater than or equal to N0, a yellow signal is displayed on a display screen, an alarm device gives an alarm, and the opening degree of the foot accelerator pedal and the rotation speed of the engine are still allowed to follow linear change in the state; when Nq is larger than or equal to N1, the display screen displays a red signal, the alarm device gives an alarm, the opening degree of the foot accelerator pedal and the rotating speed of the engine are forbidden to follow linear change, and the dump truck is forbidden to lift.
The invention provides a safety control system and a method for a power takeoff of a dump truck, which have the beneficial effects that: (1) the working state of the power takeoff can be visually reflected, and an operator can directly read the rotating speed of the power takeoff through the display to master the working state of the power takeoff; (2) the rotating speed of the power takeoff can be in a safe use state by setting a rotating speed threshold of the power takeoff, the lifting speed of a carriage is controlled, and the service life of the power takeoff is prolonged; (3) the rotating speed of the engine can be limited to be continuously increased by setting the rotating speed threshold value of the gear pump, so that the rotating speed of the power takeoff is limited to be continuously increased, the pressure of the hydraulic system is prevented from being increased instantly, the hydraulic system is protected, and the service life of the dump truck is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a safety control system of a power takeoff of a dump truck according to an embodiment of the invention;
fig. 2 is a flow chart of a safety control method of a power takeoff of a dump truck according to an embodiment of the invention.
The figure is marked with:
1. a power takeoff control switch; 2. a safety control module; 3. a receiving unit; 4. a storage unit; 5. a data analysis unit; 6. a control unit; 7. a display; 8. an alarm device; 9. an engine ECU; 10. an engine speed sensor; 11. an electronic throttle ECU; 12. a throttle mechanism.
Detailed Description
The following describes a safety control system and method for a power takeoff of a dump truck according to the present invention with reference to the accompanying drawings.
Examples
Referring to fig. 1-2, the safety control system for the power takeoff of the dump truck in the embodiment includes a power takeoff, a safety control module 2, a power takeoff control switch 1, an engine speed sensor 10, an engine ECU9, an alarm device 8, and a display 7, wherein an input shaft of the power takeoff is connected to an engine, a transmission case is connected to the engine, an output shaft of the power takeoff is connected to a gear pump of a hydraulic lifting system, and the safety control module 2 is respectively connected to the power takeoff control switch 1, the engine ECU9, the alarm device 8, and the display 7 through electric wires.
In the safety control system for the power takeoff of the dump truck, an engine speed sensor 10 is arranged on an engine blade flywheel, an engine ECU9 is connected with the engine speed sensor 10 through an electric wire, a safety control module 2 is connected with an engine ECU9 through a CAN bus, the engine speed sensor 10 is used for collecting an engine speed Nf signal and transmitting the engine speed Nf signal to an engine ECU9, the engine ECU9 transmits the engine speed Nf signal to the safety control module 2, and the safety control module 2 calculates the power takeoff speed Nq according to a formula Nq = Nf I, wherein Nq is the power takeoff speed, Nf is the engine speed, and I is a speed ratio.
The safety control module 2 is also pre-stored with a power takeoff rotating speed threshold N0 and a gear pump rotating speed threshold N1, the safety control module 2 is used for judging whether Nq exceeds the power takeoff rotating speed threshold N0 or the gear pump rotating speed threshold N1 of a hydraulic lifting system, and sending a corresponding control signal according to a judgment result, when Nq is smaller than N0, a display 7 displays a green signal on a screen, which indicates that the power takeoff is in a safe working state, and allows the opening degree of a foot accelerator pedal and the rotating speed of an engine to follow linear change; when Nq is greater than or equal to N0, a yellow signal is displayed on the screen of the display 7, an alarm is given by the alarm device 8 to prompt an operator to reduce the engine speed Nf, and the opening degree of the foot accelerator pedal and the engine speed are still allowed to follow linear change in the state; when Nq is larger than or equal to N1, a red signal is displayed on the screen of the display 7, the alarm device 8 gives an alarm to prohibit the opening degree of the foot accelerator pedal and the rotating speed of the engine from following linear change, and even if the opening degree of the foot accelerator pedal is increased, the rotating speed Nf of the engine does not change, so that the continuous increase of the rotating speed of the engine and the rotating speed of the power takeoff is restricted, and the dump truck is prohibited from continuously lifting. The gear pump rotating speed threshold N1 is the rated rotating speed of the gear pump, and the power takeoff rotating speed threshold N0 is smaller than the gear pump rotating speed threshold N1. In addition, in order to prolong the service life of the gear pump and the hydraulic lifting system, the gear pump rotating speed threshold value N1 can be set to a certain rotating speed value which is smaller than the rated rotating speed of the gear pump, and the rotating speed value is larger than the minimum rotating speed value required by the gear pump.
In order to control the engine speed conveniently, the accelerator of the dump truck adopts an electronic accelerator, the engine ECU9 is connected with an electronic accelerator ECU11 through a CAN bus, the electronic accelerator ECU11 controls the engine speed by adjusting a throttle, and the opening and closing degree of the throttle is controlled by the throttle mechanism 12. When the rotational speed Nq of the power takeoff is greater than or equal to the rotational speed threshold N1 of the gear pump, the safety control module 2 sends a control signal for prohibiting the opening degree of the foot accelerator pedal and the rotational speed of the engine from changing linearly to the engine ECU9, the engine ECU9 sends the control signal to the electronic accelerator ECU11, and the electronic accelerator ECU11 controls the opening degree of the throttle valve to be unchanged, so that the rotational speed of the engine is unchanged even if the opening degree of the foot accelerator pedal is increased, further the continuous increase of the rotational speed of the engine and the rotational speed of the power takeoff is limited, and the dump truck is prohibited from continuously lifting. Because the output shaft of the power takeoff is connected with the gear pump of the hydraulic lifting system, the output rotating speed of the power takeoff is the input rotating speed of the gear pump, when the rotating speed of the power takeoff is limited to be continuously increased, the increase of the rotating speed of the gear pump is also limited, and the hydraulic lifting system is effectively protected.
In the safety control system for the power takeoff of the dump truck provided by the embodiment, the safety control module 2 is a PLC controller, and includes a receiving unit 3, a storage unit 4, a data analysis unit 5 and a control unit 6, the receiving unit 3 is a communication interface and has a function of collecting signals, the storage unit 4 is a RAM, a ROM storage device or other devices and has writing, reading and storing functions, the data analysis unit 5 is a logic controller and has functions of logical operation, sequence control, arithmetic operation and the like, and the control unit 6 is a control module and outputs corresponding control signals. The receiving unit 3 is connected with the power takeoff control switch 1 and used for collecting power takeoff switching value signals; the receiving unit 3 is also connected with an engine ECU9 through a CAN bus and used for receiving signals of the engine speed Nf; the storage unit 4 is connected with the receiving unit 3 and is used for storing a power takeoff switching value signal and an engine rotating speed Nf signal, and the storage unit 4 stores a power takeoff rotating speed threshold N0 and a gear pump rotating speed threshold N1 of a hydraulic lifting system; the data analysis unit 5 is connected with the storage unit 4 and is used for calculating the rotation speed Nq of the power takeoff, judging whether the Nq exceeds the rotation speed threshold N0 of the power takeoff or the rotation speed threshold N1 of the gear pump, and converting a switching value signal of the power takeoff into a combination state signal of the power takeoff; the control unit 6 is respectively connected with the engine ECU9, the alarm device 8 and the display 7, and is used for sending control signals according to the determination result of the data analysis unit 5, the engine ECU9, the alarm device 8 and the display 7 execute corresponding control signals, the control unit 6 also sends the combination state signal of the power takeoff and the power takeoff rotating speed to the display 7, and the combination state of the power takeoff and the power takeoff rotating speed value can be displayed on the screen of the display 7.
In order to facilitate an operator to obtain corresponding prompt information in time, the display 7 and the alarm device 8 are arranged in the cab, and when Nq is smaller than N0, a green signal is displayed on the screen of the display 7 to indicate that the power takeoff is in a safe working state; when Nq is greater than or equal to N0, displaying a yellow signal on the screen of the display 7, and giving an alarm by the alarm device 8 to prompt an operator to reduce the rotating speed of the power takeoff; when Nq is greater than or equal to N1, the screen of the display 7 displays a red signal, the alarm device 8 gives an alarm, and an operator can operate according to different prompt signals.
The embodiment also provides a method for safely controlling the power takeoff of the dump truck by the safety control system of the power takeoff of the dump truck, which comprises the following steps:
(1) stopping the dump truck, carrying out lifting operation, turning on a power takeoff control switch, electrifying a power takeoff electromagnetic valve, turning on the power takeoff, and acquiring a power takeoff switching value signal by a safety control module;
(2) the engine rotating speed sensor detects the rotating speed Nf of the engine and transmits the rotating speed Nf to the safety control module;
(3) the safety control module calculates the rotating speed Nq of the power takeoff through a formula Nq = Nf I, wherein I is a rotating speed ratio;
(4) the safety control module judges whether Nq exceeds a power takeoff rotating speed threshold N0 or a gear pump rotating speed threshold N1, and sends control signals according to the judgment result, wherein the control signals comprise: when Nq is less than N0, the display screen displays a green signal, and the opening degree of the foot accelerator pedal and the engine speed are allowed to follow linear change; when Nq is greater than or equal to N0, a yellow signal is displayed on a display screen, an alarm device gives an alarm, and the opening degree of the foot accelerator pedal and the rotation speed of the engine are still allowed to follow linear change in the state; when Nq is larger than or equal to N1, the display screen displays a red signal, the alarm device gives an alarm, the opening degree of the foot accelerator pedal and the rotating speed of the engine are forbidden to follow linear change, and the dump truck is forbidden to lift.
The detailed working process comprises the following steps:
(1) the dump truck stops running, lifting operation is carried out, a power takeoff control switch is turned on, a power takeoff electromagnetic valve is electrified, a power takeoff is turned on, a receiving unit collects power takeoff switching value signals and transmits the power takeoff switching value signals to a storage unit, the storage unit sends the power takeoff switching value signals to a data analysis unit, the power takeoff switching value signals are analyzed by the data analysis unit and then sent to a display through a control unit, the display displays the combination state of the power takeoff, and the power takeoff switching value signals collected by the system are actually power takeoff turn-on signals;
(2) the engine speed sensor collects an engine speed signal and transmits the engine speed signal to the engine ECU, the engine ECU transmits the engine speed signal to the receiving unit through the CAN bus, the receiving unit transmits the signal to the storage unit for storing the engine speed Nf, and the storage unit stores a power takeoff speed threshold N0 and a gear pump speed threshold N1;
(3) the data analysis unit calculates the rotation speed Nq of the power takeoff through a formula Nq = Nf I, and transmits the rotation speed Nq of the power takeoff to the control unit, the control unit transmits the rotation speed Nq of the power takeoff to the display, and the rotation speed Nq of the power takeoff can be displayed on the display;
(4) the data analysis unit judges whether Nq exceeds a power takeoff rotating speed threshold value N0 or a gear pump rotating speed threshold value N1 or not, and transmits a judgment result to the control unit;
(5) the control unit sends control signals according to the determination result of the data analysis unit, and the display, the alarm device and the engine ECU9 execute corresponding control signals:
a. when Nq is smaller than N0, a green signal is displayed on a display screen, which indicates that the power takeoff is in a safe working state, the opening degree of a foot accelerator pedal and the rotating speed of the engine are allowed to follow linear change, and the dump truck is allowed to lift;
b. when Nq is larger than or equal to N0, a yellow signal is displayed on a display screen, and an alarm device gives an alarm to prompt an operator to reduce the engine speed Nf, and the opening degree of the foot accelerator pedal and the engine speed are still allowed to follow linear change in the state;
c. when Nq is larger than or equal to N1, a display screen displays a red signal, the alarm device gives an alarm, and the opening degree of the foot accelerator pedal and the rotating speed of the engine are prohibited from following linear change, even if the opening degree of the foot accelerator pedal is increased, the rotating speed Nf of the engine does not change, further the continuous increase of the rotating speed of the engine and the rotating speed of the power takeoff is limited, and the dump truck is prohibited from continuously lifting.

Claims (8)

1. A safety control system for a power takeoff of a dump truck is characterized by comprising a power takeoff, a safety control module, a power takeoff control switch, an engine rotating speed sensor, an engine ECU, an alarm device and a display; the input shaft of the power takeoff is connected with a gearbox, the gearbox is connected with an engine, the engine is connected with an accelerator, and the output shaft of the power takeoff is connected with a gear pump of a hydraulic lifting system; the safety control module is respectively connected with the power takeoff control switch, the engine ECU, the alarm device and the display;
the engine rotating speed sensor is arranged on an engine blade flywheel and used for acquiring the rotating speed Nf of the engine;
the engine ECU is connected with an engine rotating speed sensor and used for receiving an engine rotating speed Nf;
the safety control module is connected with the engine ECU through a CAN bus and used for receiving the rotating speed Nf of the engine and calculating the rotating speed Nq of the power takeoff; the engine ECU is connected with an accelerator, the accelerator is an electronic accelerator, the engine ECU is connected with the electronic accelerator ECU through a CAN bus, and the electronic accelerator ECU controls the relation between the opening degree of a foot accelerator pedal and the rotating speed of the engine through adjusting a throttle valve;
the safety control module is stored with a power takeoff rotating speed threshold N0 and a gear pump rotating speed threshold N1, and is used for judging whether the power takeoff rotating speed Nq exceeds the power takeoff rotating speed threshold N0 or the gear pump rotating speed threshold N1, and sending a control signal according to the judgment result, wherein the control signal comprises: when the power takeoff rotating speed Nq is smaller than a power takeoff rotating speed threshold value N0, a display screen displays a green signal, the opening degree of a foot accelerator pedal and the rotating speed of an engine are allowed to follow linear change, when the Nq is larger than or equal to N0, the display screen displays a yellow signal, an alarm device gives an alarm, the opening degree of the foot accelerator pedal and the rotating speed of the engine are allowed to follow linear change, when the power takeoff rotating speed Nq is larger than or equal to a gear pump rotating speed threshold value N1, the opening degree of the foot accelerator pedal and the rotating speed of the engine are forbidden to follow linear change, and lifting of a dump truck.
2. The safety control system for the power takeoff of the dump truck as claimed in claim 1, wherein the calculation formula of the rotation speed Nq of the power takeoff is as follows: nq = Nf I, where Nq is the power take-off speed, Nf is the engine speed, and I is the speed ratio.
3. The safety control system for the power takeoff of the dump truck as claimed in claim 1, wherein the power takeoff rotation speed threshold N0 is less than the gear pump rotation speed threshold N1.
4. The safety control system for the power takeoff of the dump truck as claimed in claim 1, wherein the gear pump rotation speed threshold value N1 is the rated rotation speed of the gear pump.
5. The safety control system for the power takeoff of the dump truck as claimed in claim 1, wherein the gear pump rotation speed threshold value N1 is smaller than the rated rotation speed of the gear pump.
6. The safety control system of the power takeoff of the dump truck as claimed in claim 1, wherein the safety control module comprises: the device comprises a receiving unit, a storage unit, a data analysis unit and a control unit;
the receiving unit is connected with an engine ECU (electronic control Unit) through a CAN (controller area network) bus and used for receiving signals of the rotating speed Nf of the engine;
the receiving unit is connected with the power takeoff control switch and used for collecting power takeoff switching value signals;
the storage unit is connected with the receiving unit and used for storing a power takeoff switching value signal and an engine rotating speed Nf signal;
the data analysis unit is connected with the storage unit and is used for calculating the rotating speed Nq of the power takeoff, judging whether the Nq exceeds a power takeoff rotating speed threshold value N0 or a gear pump rotating speed threshold value N1 or not, and analyzing a power takeoff switching value signal; the control unit is respectively connected with the data analysis unit, the engine ECU, the alarm device and the display, and is used for sending a control signal according to the judgment result of the data analysis unit.
7. The safety control system for the power takeoff of the dump truck as claimed in claim 1, wherein the alarm device and the display are arranged in a cab.
8. The method for the safety control of the power takeoff of the dump truck by the safety control system of the power takeoff of the dump truck as claimed in any one of claims 1 to 7, characterized by comprising the steps of,
(1) stopping the dump truck, carrying out lifting operation, turning on a power takeoff control switch, electrifying a power takeoff electromagnetic valve, turning on the power takeoff, and acquiring a power takeoff switching value signal by a safety control module;
(2) the engine rotating speed sensor detects the rotating speed Nf of the engine and transmits the rotating speed Nf to the safety control module;
(3) the safety control module calculates the rotating speed Nq of the power takeoff through a formula Nq = Nf I, wherein I is a rotating speed ratio;
(4) the safety control module judges whether Nq exceeds a power takeoff rotating speed threshold N0 or a gear pump rotating speed threshold N1, and sends control signals according to the judgment result, wherein the control signals comprise: when Nq is less than N0, the display screen displays a green signal, and the opening degree of the foot accelerator pedal and the engine speed are allowed to follow linear change; when Nq is greater than or equal to N0, a yellow signal is displayed on a display screen, an alarm device gives an alarm, and the opening degree of the foot accelerator pedal and the rotation speed of the engine are still allowed to follow linear change in the state; when Nq is larger than or equal to N1, the display screen displays a red signal, the alarm device gives an alarm, the opening degree of the foot accelerator pedal and the rotating speed of the engine are forbidden to follow linear change, and the dump truck is forbidden to lift.
CN201811109692.8A 2018-09-21 2018-09-21 Safety control system and method for power takeoff of dump truck Active CN109367390B (en)

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