Throttle vibration control system and control method for road roller

Abstract

The present invention discloses a throttle vibration control system and control method for a road roller, which belongs to the field of control systems and methods for engineering machinery, and solves the problem in the prior art that there is a lack of a throttle vibration control system and control method for a road roller that can automatically determine whether the throttle meets the vibration conditions, control the vibration to start, automatically increase the vibration speed, reduce the labor intensity of the driver, protect the vibration mechanism, and avoid damage to the vibration mechanism. It mainly includes an engine control unit, a control display screen and a bus control switch, the engine control unit, the control display screen and the bus control switch are connected through a CAN bus; the control display screen is respectively connected to a vehicle speed sensor, a selection switch and a vibration control relay, the selection switch is connected to the vibration control relay; the selection switch and the vibration control relay are connected to a power supply. The present invention is mainly used for controlling the throttle and vibration of a road roller.

Description

Technical Field

[0001] The present invention relates to a control system and method for engineering machinery, and in particular to a throttle vibration control system and method for a road roller. Background Art

[0002] A road roller is a mechanical device that uses its own gravity and vibration to compact various construction and road-building materials. At present, vibratory rollers are generally set with two vibration modes: large amplitude and small amplitude, to meet different compaction requirements of the road surface. Due to different working conditions during construction, the engine speed required for the roller during transfer and steel wheel vibration is different, and both need to be manually adjusted to the appropriate speed. Currently, before turning on the vibration, you need to manually adjust the engine speed to the vibration speed, then select the large amplitude or small amplitude mode, and finally press the vibration start switch to start vibration. The engine speed during vibration needs to be set manually to complete.

[0003] Therefore, the operator needs to constantly switch the engine speed between vibration and travel conditions, which is frequent and labor-intensive. If the operator makes a mistake and starts the vibration mode at a low engine speed, the vibration frequency of the working device is low, and the whole vehicle is prone to resonance, causing great damage to the whole machine structure and vibration mechanism, which will greatly shorten the service life and even cause damage in serious cases.

[0004] Currently, there is a lack of a roller throttle vibration control system and control method that can automatically determine whether the throttle meets the vibration conditions, control the start of vibration, and automatically increase the speed to the vibration speed, thereby reducing the driver's labor intensity, protecting the vibration mechanism, extending its service life, and avoiding damage to the vibration mechanism caused by misoperation. Summary of the invention

[0005] The purpose of the present invention is to provide a road roller throttle vibration control system and control method to solve the problem in the prior art that there is a lack of a road roller throttle vibration control system and control method that can automatically determine whether the throttle meets the vibration conditions, control the start of vibration, and automatically increase to the vibration speed, thereby reducing the driver's labor intensity, protecting the vibration mechanism, extending its service life, and avoiding damage to the vibration mechanism caused by misoperation.

[0006] The present invention is achieved through the following technical solutions:

[0007] A throttle vibration control system for a road roller comprises an engine control unit, a control display screen and a bus control switch, wherein the engine control unit, the control display screen and the bus control switch are connected via a CAN bus; the control display screen is respectively connected to a vehicle speed sensor, a selection switch and a vibration control relay, and the selection switch is connected to the vibration control relay; the selection switch and the vibration control relay are connected to a power supply; a vibration starting switch is provided between the control display screen and the vibration control relay; the selection switch is connected to a solenoid valve; and the engine control unit is connected to a foot throttle.

[0008] Furthermore, the solenoid valve includes a large-amplitude solenoid valve and a small-amplitude solenoid valve.

[0009] A control method for a throttle vibration control system for a road roller, the control method comprising:

[0010] 1) When the roller is in the moving condition, adjust the engine throttle and the engine control unit controls the engine to execute the corresponding speed;

[0011] 2) When the roller is in vibration working condition, press the selection switch, the engine control unit executes the preset engine vibration speed request, presses the vibration start switch, the vibration control relay is energized, and the large amplitude solenoid valve or the small amplitude solenoid valve is energized through the selection switch;

[0012] 3) When the roller is vibrating, the bus control switch is enabled and the accelerator is disabled when the selector switch is pressed.

[0013] 4) When the selection switch is pressed and the engine speed automatically increases to the engine vibration preset speed, adjust the actual engine speed and set the lowest allowable vibration engine speed. When the actual engine speed is greater than or equal to the lowest allowable vibration engine speed, press the vibration start switch, the vibration control relay is energized, the large amplitude solenoid valve or the small amplitude solenoid valve is energized, and the steel wheel vibrates; when the actual engine speed is less than the lowest allowable vibration engine speed, the vibration control relay is disconnected, the large amplitude solenoid valve or the small amplitude solenoid valve is not energized, and the steel wheel does not vibrate.

[0014] Furthermore, the engine speed information is displayed in real time on the control display screen.

[0015] Furthermore, the control display screen is provided with engine speed setting options when vibration is allowed and vehicle speed setting options when vibration is allowed. When both are checked, the two are in an "and" relationship. The control display screen is provided with a large and small vibration switching interval option. When the control display screen receives the signal from the selection switch for switching between large and small amplitudes, it will output after a delay.

[0016] Furthermore, the engine throttle adjustment includes dual throttle control and single throttle control. When dual throttle control is used, the foot throttle is effective, the engine control unit receives the speed request and controls the engine to execute the corresponding speed, and the bus control switch is invalid; when single throttle control is used, the bus control switch is always effective, the control display receives the throttle signal and sends a speed request to the engine control unit, and the engine control unit controls the engine to execute the corresponding speed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. There is no need to manually adjust the speed during vibration operation. Simply press the selection switch to automatically switch to the engine vibration speed, reducing the number of operating steps, reducing the driver's labor intensity, and improving efficiency.

[0019] 2. The throttle control knob on the bus control switch can be integrated on the keypad, with high integration and easy operation.

[0020] 3. After pressing the selection switch, the engine throttle automatically increases to the preset vibration speed. The vibration control is related to the engine speed and vehicle speed, and can be set through the interface. The delay vibration time for switching between large and small vibrations can be set through the settings menu.

[0021] 4. Avoid damage caused by misoperation, increase the service life of the whole machine, reduce the loss caused by user misoperation, make manual adjustments according to different situations, and have strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an electrical schematic diagram of the present invention;

[0023] Figure 2 is a schematic diagram of a vibration control condition setting interface on a control display screen of the present invention;

[0024] Figure 3 is a single throttle control flow chart of the present invention;

[0025] Figure 4 is a dual throttle control flow chart of the present invention;

[0026] Figure 5 It is a vibration control flow chart of the present invention.

[0027] In the figure: 1. Control display screen; 2. Foot accelerator; 3. Engine control unit; 4. Vehicle speed sensor; 5. Vibration start switch; 6. Bus control switch; 7. Selection switch; 8. Power supply; 9. Vibration control relay; 10. Large amplitude solenoid valve; 11. Small amplitude solenoid valve. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Embodiment 1, a throttle vibration control system for a road roller, comprising an engine control unit 3, a control display screen 1 and a bus control switch 6, wherein the engine control unit 3, the control display screen 1 and the bus control switch 6 are connected via a CAN bus; the control display screen 1 is respectively connected to a vehicle speed sensor 4, a selection switch 7 and a vibration control relay 9, and the selection switch 7 and the vibration control relay 9 are connected; the selection switch 7 and the vibration control relay 9 are connected to a power supply 8; a start-up switch 5 is provided between the control display screen 1 and the vibration control relay 9; the selection switch 7 is connected to a solenoid valve; the engine control unit 3 is connected to a foot accelerator 2; the solenoid valve comprises a large-amplitude solenoid valve 10 and a small-amplitude solenoid valve 11.

[0030] Embodiment 2: A control method for a throttle vibration control system of a road roller, the control method comprising:

[0031] 1) When the roller is in the moving state, the engine throttle is adjusted, and the engine control unit 3 controls the engine to execute the corresponding speed;

[0032] 2) When the roller is in vibration working condition, the selection switch 7 is pressed to select the large amplitude or small amplitude vibration mode. After the control display screen 1 receives the large vibration or small vibration signal, it sends the engine vibration speed request preset in the control display screen 1 to the engine control unit 3. The engine control unit 3 executes the preset engine vibration speed request, presses the vibration start switch 5, the vibration control relay 9 is energized, the large amplitude solenoid valve 10 and the small amplitude solenoid valve 11 are energized through the selection switch 7, and the large amplitude working mode or small amplitude mode vibration starts to work;

[0033] 3) In the vibration working condition of the roller, when the selector switch 7 is pressed, the throttle control knob on the bus control switch 6 has the highest priority, and the foot throttle 2 is invalid;

[0034] 4) When the selection switch 7 is pressed and the engine speed is automatically increased to the engine vibration preset speed, the throttle knob on the bus control switch 6 is used to manually adjust the actual engine speed to be greater than or less than the engine vibration preset speed; the lowest allowable vibration engine speed is set by controlling the display screen 1. When the actual engine speed is greater than or equal to the lowest allowable vibration engine speed, the start switch 5 is pressed, the vibration control relay 9 is energized, the large amplitude solenoid valve 10 and the small amplitude solenoid valve 11 are energized through the selection switch 7, and the steel wheel vibrates; when the actual engine speed is less than the lowest allowable vibration engine speed, even if the start switch 5 is pressed, the vibration control relay 9 is still in the disconnected state, the large amplitude solenoid valve 10 and the small amplitude solenoid valve 11 are not energized, and the steel wheel does not vibrate.

[0035] Embodiment 3, a control method for a throttle vibration control system for a road roller, the engine speed information is displayed in real time on the control display screen 1; the control display screen 1 is provided with engine speed when vibration is allowed and vehicle speed setting options when vibration is allowed, and one or two conditions are checked as the vibration control output according to actual needs. When both are checked, the two are in an and relationship; the control display screen 1 is provided with a large and small vibration switching interval option, when the control display screen 1 receives a signal from the selection switch 7 to switch between large and small amplitudes, it will output after a set switching time delay; the engine throttle adjustment includes dual throttle control and single throttle control, when dual throttle control is used, the foot throttle 2 is effective, the engine control unit 3 receives the speed request and controls the engine to execute the corresponding speed, and the bus control switch 6 is invalid; when single throttle control is used, the bus control switch 6 is always effective, the control display screen 1 receives the throttle signal and sends the speed request to the engine control unit 3, the engine control unit 3 controls the engine to execute the corresponding speed, and the rest is the same as embodiment 2.

[0036] The engine vibration preset speed is factory preset, and the lowest permissible vibration engine speed can be set by the user on the control display screen 1. When it is controlled by the bus control switch 6 alone, it is single throttle control; when it is controlled by the bus control switch 6 and the foot throttle together, it is double throttle control.

[0037] Single throttle control process:

[0038] Initially, the engine throttle is at the current speed.

[0039] When there is a bus throttle speed request, the engine executes the requested speed; otherwise, the engine maintains the current speed. When the roller is in the traveling condition, the operator can adjust the engine throttle according to the engine speed through the throttle control knob on the bus control switch 6. The bus control switch 6 transmits the plus and minus signals to the control display screen 1 through the CAN bus. The control display screen 1 converts the throttle plus and minus information of the bus control switch 6 into a speed request and sends it to the engine control unit 3. The engine control unit 3 controls the engine to execute the corresponding speed according to the request, and sends the real-time speed information to the control display screen 1 through the CAN bus. The control display screen 1 is equipped with a liquid crystal display, which can display the speed information sent by the engine control unit 3 in real time on the liquid crystal display, realizing human-computer interaction of the engine speed.

[0040] When the selection switch 7 is pressed, the engine speed directly executes the preset speed of the engine vibration, otherwise the current speed is maintained unchanged. After the engine speed directly executes the preset speed of the engine vibration, the bus control switch 6 has a speed request at this time, and its speed request can still be executed, otherwise the previous speed is maintained. When the roller is in vibration working condition, since the vibration requires the engine to be at a high speed, the operator directly presses the selection switch 7 to select a large amplitude or small amplitude vibration mode. Since the selection switch 7 is connected to the control display screen 1 through a hard line, after the control display screen 1 receives the large vibration or small vibration signal, it directly sends the engine vibration speed request preset in the control display screen 1 to the engine control unit 3. The engine control unit 3 executes the engine vibration preset speed request of the control display screen 1, and the engine speed is increased to the vibration preset speed, and the vibration preset speed is displayed in real time on the LCD screen. At the same time, the vibration control output signal of the control display screen 1 is valid. When the operator presses the vibration start switch 5, the vibration control relay 9 is energized, and the large amplitude solenoid valve 10 or the small amplitude solenoid valve 11 is energized through the selection switch 7, and the large amplitude working mode or small amplitude mode vibration starts to work.

[0041] Dual throttle control process:

[0042] Initially, the engine throttle is at the current speed.

[0043] When the selection switch 7 is not pressed, only the foot accelerator 2 is valid, the engine executes the speed request of the foot accelerator 2, and the throttle request of the bus control switch 6 is invalid.

[0044] When the selection switch 7 is pressed, the engine performs the engine vibration preset speed. At this time, the throttle request of the bus control switch 6 is valid, and the request of the foot throttle 2 is invalid.

[0045] Vibration control process:

[0046] The engine speed, vehicle speed and delay time for switching between large and small vibrations are set through the vibration control condition interface on the control display screen 1.

[0047] The engine speed and vehicle speed are the engine speed and vehicle speed when vibration is allowed, which can be used separately or in parallel as the conditions for allowing vibration. After collecting the corresponding signals, a judgment is made. When it is greater than or equal to the set conditions, the vibration control output is executed. When switching between large and small vibrations, the vibration control output is executed after the large and small vibration switching delay time.

[0048] When the selection switch 7 is pressed, the engine speed automatically increases to the engine vibration preset speed. The operator can still manually adjust the engine speed to be greater or less than the engine vibration preset speed through the throttle knob of the bus control switch 6 as needed.

[0049] A minimum allowable engine speed for vibration can be set by controlling the display screen 1. When the actual engine speed is not less than the minimum allowable engine speed for vibration, the vibration control output signal is valid, the vibration start switch 5 is pressed, the vibration control relay 9 is energized, and the large amplitude solenoid valve 10 or the small amplitude solenoid valve 11 is energized through the selection switch 7, allowing the steel wheel to vibrate; when the actual engine speed is less than the minimum allowable engine speed for vibration, the vibration control output signal is invalid, even if the operator presses the vibration start switch 5, the vibration control relay 9 is still in the disconnected state, the large amplitude solenoid valve 10 or the small amplitude solenoid valve 11 is not energized, and the steel wheel does not vibrate.

[0050] The engine speed can be displayed in real time. When in vibration working condition, the selection switch 7 is pressed. The selection switch 7 is a two-way control switch, one of which is connected to the control display screen 1. After receiving the signal, it is known that the operator intends to turn on the vibration, and sends the engine vibration preset speed request preset in the control display screen 1 to the engine control unit 3. The engine control unit 3 controls the engine to automatically increase the speed to the target speed to meet the conditions for allowing vibration.

[0051] Since the engine speed can be adjusted manually, when the real-time speed is less than the lowest allowable vibration engine speed, the control display screen 1 will be able to limit the output of the vibration control output signal. The lowest allowable vibration engine speed can also be adjusted through the bus control switch 6; the engine speed condition of the vibration control condition interface is preceded by a check box. When checked, the engine speed and the vibration control output signal are associated, and the actual engine speed must be greater than the lowest allowable vibration engine speed to be effective; when not checked, the vibration control output signal is directly output.

[0052] A vehicle speed for allowing vibration can be set by controlling the display screen 1 as a condition for the effective output of the vibration control output signal. When the vehicle speed for allowing vibration is checked, the real-time vehicle speed collected by the speed sensor 4 is not less than the set vibration allowable speed, and the vehicle speed meets the output condition of the vibration control output signal; when the real-time vehicle speed collected by the speed sensor 4 is less than the set vibration allowable speed, the vehicle speed does not meet the output condition of the vibration control output signal.

[0053] The user can select one of the engine speed when vibration is allowed and the vehicle speed when vibration is allowed as the condition for vibration control output according to actual needs, or both can be checked. When both are checked, the two are in an "and" relationship.

[0054] The switching interval of large and small vibration can be set through the control display screen 1. When the control display screen 1 receives the signal of the selection switch 7 to switch the large and small amplitude, the vibration control output signal will be output after the set switching time delay, thereby avoiding the damage of the excitation mechanism caused by the steel wheel not stopping the large and small vibration switching and steering switching. In addition, the delay time can be adjusted according to the differences of different models, and the large and small vibration delay switching time suitable for different models can be set, thereby improving work efficiency.

Claims

1. A control method for a throttle vibration control system for a road roller, characterized in that: The invention comprises a throttle vibration control system for a road roller, which comprises an engine control unit (3), a control display screen (1) and a bus control switch (6), wherein the engine control unit (3), the control display screen (1) and the bus control switch (6) are connected via a CAN bus; the control display screen (1) is respectively connected to a vehicle speed sensor (4), a selection switch (7) and a vibration control relay (9), and the selection switch (7) and the vibration control relay (9) are connected; the selection switch (7) and the vibration control relay (9) are connected to a power source (8); a vibration start switch (5) is provided between the control display screen (1) and the vibration control relay (9); the selection switch (7) is connected to a solenoid valve; the engine control unit (3) is connected to a foot throttle (2) The solenoid valve comprises a large-amplitude solenoid valve (10) and a small-amplitude solenoid valve (11); when the selection switch (7) is not pressed, only the foot accelerator (2) is effective, the engine executes the speed request of the foot accelerator (2), and the throttle request of the bus control switch (6) is invalid; when the selection switch (7) is pressed, the engine executes the engine vibration preset speed, at this time the throttle request of the bus control switch (6) is effective, and the foot accelerator (2) request is invalid; when in the vibration working condition, the selection switch (7) is pressed, the selection switch (7) is a two-way control switch, and sends the engine vibration preset speed request preset in the control display screen (1) to the engine control unit (3), and the engine control unit (3) controls the engine to automatically increase the speed to the target speed to achieve the condition of allowing vibration; A minimum permissible vibration engine speed is set through the control display screen (1). When the actual engine speed is not less than the minimum permissible vibration engine speed, the vibration control output signal is valid, the vibration start switch (5) is pressed, the vibration control relay (9) is energized, the large amplitude solenoid valve (10) or the small amplitude solenoid valve (11) is energized through the selection switch (7), and the steel wheel is allowed to vibrate; when the actual engine speed is less than the minimum permissible vibration engine speed, the vibration control output signal is invalid, even if the operator presses the vibration start switch (5), the vibration control relay (9) is still in a disconnected state, the large amplitude solenoid valve (10) or the small amplitude solenoid valve (11) is not energized, and the steel wheel does not vibrate; A vehicle speed at which vibration is allowed is set by the control display screen (1) as a condition for the effective output of the vibration control output signal. When the vehicle speed at which vibration is allowed is checked, the real-time vehicle speed collected by the vehicle speed sensor (4) is not less than the set vibration allowable vehicle speed, and the vehicle speed satisfies the output condition of the vibration control output signal; when the real-time vehicle speed collected by the vehicle speed sensor (4) is less than the set vibration allowable vehicle speed, the vehicle speed does not satisfy the output condition of the vibration control output signal.

2. The control method of the roller throttle vibration control system according to claim 1, characterized in that: The following steps are also included: 1) When the roller is in the moving state, the engine throttle is adjusted, and the engine control unit (3) controls the engine to execute the corresponding speed; 2) When the roller is in a vibration operating condition, the selection switch (7) is pressed, the engine control unit (3) executes a preset engine vibration speed request, the vibration start switch (5) is pressed, the vibration control relay (9) is energized, and the large amplitude solenoid valve (10) or the small amplitude solenoid valve (11) is energized through the selection switch (7); 3) When the roller is vibrating, the selector switch (7) is pressed, the bus control switch (6) is effective, and the foot accelerator (2) is ineffective; 4) When the selection switch (7) is pressed and the engine speed is automatically increased to the preset engine vibration speed, the actual engine speed is adjusted and the lowest allowable vibration engine speed is set. When the actual engine speed is greater than or equal to the lowest allowable vibration engine speed, the vibration start switch (5) is pressed, the vibration control relay (9) is energized, the large amplitude solenoid valve (10) or the small amplitude solenoid valve (11) is energized, and the steel drum vibrates; when the actual engine speed is less than the lowest allowable vibration engine speed, the vibration control relay (9) is disconnected, the large amplitude solenoid valve (10) or the small amplitude solenoid valve (11) is not energized, and the steel drum does not vibrate.

3. The control method of the roller throttle vibration control system according to claim 1, characterized in that: The engine speed information is displayed in real time on the Control Display (1).

4. The control method of the roller throttle vibration control system according to claim 1, characterized in that: The control display screen (1) is provided with engine speed setting options when vibration is allowed and vehicle speed setting options when vibration is allowed. When both are checked, the two are in an AND relationship. The control display screen (1) is provided with a large and small vibration switching interval option. When the control display screen (1) receives a signal from the selection switch (7) for switching between large and small amplitudes, it is output after a delay.

5. The control method of the roller throttle vibration control system according to claim 1, characterized in that: The engine throttle adjustment includes dual throttle control and single throttle control. When the dual throttle control is used, the foot throttle (2) is effective, the engine control unit (3) receives the speed request and controls the engine to execute the corresponding speed, and the bus control switch (6) is invalid; when the single throttle control is used, the bus control switch (6) is always effective, the control display screen (1) receives the throttle signal and sends the speed request to the engine control unit (3), and the engine control unit (3) controls the engine to execute the corresponding speed.

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