Starting protection device for emergency pump of automobile crane

Abstract

The utility model discloses an automobile crane emergency pump starting protection device which comprises a power supply bus, a data bus, an engine ECU (Electronic Control Unit), an emergency pump state instrument, an emergency pump motor controller, a master controller and an emergency pump switch, the emergency pump switch is connected between the power supply bus and the power input end of the emergency pump state instrument, data ports of the engine ECU, the emergency pump motor controller and the master controller are all connected to the data bus, and a PWM output port of the emergency pump state instrument is connected with a PWM input port of the emergency pump motor controller. The engine ECU and the master controller are subjected to data interaction through the data bus, the situation that the emergency pump and the engine are started at the same time is avoided, and the danger caused by system impact and misoperation is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile cranes, in particular to an emergency pump start-up protection device for automobile cranes. Background Art

[0002] Truck cranes require the installation of an emergency pump on the entire vehicle. When the engine fails to work properly due to a serious fault, turn on the emergency pump switch. After the emergency pump motor controller receives the 24V electrical signal and PWM control signal, it outputs the corresponding power to control the emergency pump motor to rotate. The emergency pump motor drives the emergency pump to take power. At the same time, the main controller outputs the pilot enable signal. After the vehicle is connected to the pilot enable signal, pressure is built up and various actions are performed through the handle. However, when the engine is working and the vehicle is driving, once the emergency pump switch is turned on, the battery will be depleted and the vehicle will have a power source, which may cause danger after malfunction. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an emergency pump starting protection device for a truck crane, which exchanges data between the engine ECU and the main controller through a data bus, thereby avoiding the situation where the emergency pump and the engine are started at the same time, and effectively avoiding the dangers caused by system impact and misoperation.

[0004] The technical solution of the utility model is:

[0005] A vehicle crane emergency pump start-up protection device comprises a power supply bus, a data bus, an engine ECU, an emergency pump status meter, an emergency pump motor controller, a main controller, an emergency pump switch, a pilot enable switch and a pilot solenoid valve. The power input ends of the engine ECU, the emergency pump motor controller and the main controller are all connected to the power supply bus. One end of the emergency pump switch is connected to the power supply bus and the other end is connected to the power input end of the emergency pump status meter. One end of the pilot enable switch is connected to the power supply bus and the other end is connected to the pilot switch status input end of the main controller. One end of the pilot solenoid valve is connected to the pilot signal output end of the main controller and the other end is grounded. The data ports of the engine ECU, the emergency pump motor controller and the main controller are all connected to the data bus. The PWM output port of the emergency pump status meter is connected to the PWM input port of the emergency pump motor controller.

[0006] The emergency pump status instrument includes a single chip microcomputer and an instrument display screen connected to the single chip microcomputer. The power input end of the single chip microcomputer is connected to the other end of the emergency pump switch, and the PWM output port of the single chip microcomputer is connected to the input port of the emergency pump motor controller.

[0007] The data port of the single chip microcomputer is connected to the data bus.

[0008] A power supply battery and a key start switch are connected in series on the power supply bus, the negative pole of the power supply battery is grounded, the positive pole of the power supply battery is connected to one end of the key start switch, and the power input end of the engine ECU, the power input end of the emergency pump motor controller, the power input end of the main controller, one end of the emergency pump switch and one end of the pilot enable switch are all connected to the other end of the key start switch.

[0009] The grounding terminals of the engine ECU, the emergency pump status instrument, the emergency pump motor controller and the master controller are all grounded.

[0010] Advantages of the utility model:

[0011] (1) The utility model can start the engine normally when the emergency pump is not working. During the normal operation of the engine, even if the emergency pump switch is operated by mistake, the main controller will determine whether to start the emergency pump according to the actual engine speed state, thereby avoiding the problem of system impact caused by mistaken operation of the emergency pump switch.

[0012] (2) When the emergency pump is working, the utility model displays the working status of the emergency pump through the emergency pump status instrument, thereby reminding the operator that the equipment is in an emergency state.

[0013] (3) When the emergency pump is working, the utility model exchanges data through the data bus. After the engine ECU learns that the emergency pump is in working state, it no longer executes the engine start command, thereby avoiding the impact of the engine start on the hydraulic system.

[0014] (4) When the utility model disconnects the emergency pump switch, the PWM signal transmitted by the emergency pump status instrument to the emergency pump motor controller is a smooth ramp-like descending waveform, thereby avoiding the impact of the emergency pump action and improving the smoothness of operation.

[0015] (5) The utility model shortens the unnecessary power-on time of the pilot solenoid valve and improves the life of the components. In the engine working mode, the working conditions of the pilot solenoid valve are: the pilot enable switch is closed and the engine speed is ≥ the set speed value; in the emergency pump working mode, the working conditions of the pilot solenoid valve are: the pilot enable switch is closed and the emergency pump is in working state. The pilot solenoid valve is closed and powered on only when the above two conditions are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a circuit diagram of the utility model.

[0017] Figure 2 It is a control principle diagram of the utility model.

[0018] Figure numerals: 1-power supply bus, 2-data bus, 3-power supply battery, 4-key start switch, 5-engine ECU, 6-emergency pump status instrument, 7-emergency pump motor controller, 8-main controller, 9-emergency pump switch, 10-pilot enable switch, 11-pilot solenoid valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See Figure 1 and Figure 2 , a vehicle crane emergency pump start protection device, including a power supply bus 1, a data bus 2, an engine ECU 5, an emergency pump status instrument 6, an emergency pump motor controller 7, a master controller 8, an emergency pump switch 9, a pilot enable switch 10 and a pilot solenoid valve 11, the emergency pump status instrument 6 including a single chip microcomputer and an instrument display screen connected to the single chip microcomputer;

[0021] A power supply battery 3 and a key start switch 4 are connected in series on the power supply bus 1, the negative electrode of the power supply battery 3 is grounded, the positive electrode of the power supply battery 3 is connected to one end of the key start switch 4, the power input ends of the engine ECU 5, the emergency pump motor controller 7 and the main controller 8 are all connected to the other end of the key start switch 4, one end of the emergency pump switch 9 is connected to the other end of the key start switch 4, and the other end is connected to the power input end of the emergency pump status instrument 6 single chip computer, the grounding ends of the engine ECU 5, the emergency pump status instrument 6, the emergency pump motor controller 7 and the main controller 8 are all grounded, one end of the pilot enable switch 10 is connected to the power supply bus 1, and the other end is connected to the pilot switch state input end of the main controller 8, one end of the pilot solenoid valve 11 is connected to the pilot signal output end of the main controller 8, and the other end is grounded, the engine ECU 5, the single chip computer of the emergency pump status instrument 6, the emergency pump motor controller 7 and the main controller 8 The data ports are all connected to the data bus 2, and the PWM output port of the single chip computer of the emergency pump status instrument 6 is connected to the PWM input port of the emergency pump motor controller 7.

[0022] The working principle of this utility model:

[0023] (1) After the key start switch 4 is closed, under normal conditions, the emergency pump switch 9 is in the off state, the engine ECU 5 starts the engine, connects the power take-off device, and the hydraulic pump works under the drive of the engine gearbox; at the same time, the pilot enable switch 10 is closed, and the main controller 8 obtains the engine speed detected by the engine ECU 5 through the data bus 2. When the engine speed is ≥ the set speed, the main controller 8 outputs a 24V signal to control the pilot solenoid valve 11 to close; get on the vehicle to establish the pilot pressure, and move the handle to perform the corresponding action;

[0024] (2) When the emergency pump needs to work, close the emergency pump switch 9. At this time, the engine speed is 0, the emergency pump status instrument 6 is powered on and activated, and the emergency pump working status diagram is displayed on the instrument display screen of the emergency pump status instrument 6 to remind the operator that the equipment is in an emergency state; the emergency pump status instrument 6 outputs a default PWM signal to the emergency pump motor controller 7, and the emergency pump motor controller 7 controls the operation of the emergency pump. At the same time, the emergency pump working message data is sent to the main controller 8 through the data bus 2. The main controller 8 closes the pilot enable switch 10, and the main controller 8 outputs a 24V signal to control the pilot solenoid valve 11 to close; get on the vehicle to establish the pilot pressure, and move the handle to perform the corresponding action;

[0025] (3) When the emergency pump is turned off, the emergency pump switch 9 is disconnected, the emergency pump status instrument 6 detects the disconnection signal, and then the PWM signal transmitted to the emergency pump motor controller 7 is a smooth ramp-like descending waveform, and the emergency pump motor controller 7 controls the emergency pump to gradually stop running until it is completely shut down;

[0026] (4) When the engine is in operation, the emergency pump switch 9 is closed by mistake. Although the emergency pump status meter 6 is powered on and activated, and outputs a default PWM signal to the emergency pump motor controller 7, the emergency pump motor controller 7 learns through the data bus 2 that the engine speed detected by the engine ECU 5 is ≥ the set speed, so the emergency pump operation is not triggered;

[0027] (5) During the operation of the emergency pump, the engine is started by mistake. The emergency pump motor controller 7 detects the message data that the emergency pump has been working. The engine ECU 5 learns the message data that the emergency pump has been working through the data bus 2, that is, the engine action is not started.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An emergency pump start protection device for a truck crane, characterized in that: It includes a power supply bus, a data bus, an engine ECU, an emergency pump status instrument, an emergency pump motor controller, a main controller, an emergency pump switch, a pilot enable switch and a pilot solenoid valve. The power input ends of the engine ECU, the emergency pump motor controller and the main controller are all connected to the power supply bus, one end of the emergency pump switch is connected to the power supply bus, and the other end is connected to the power input end of the emergency pump status instrument, one end of the pilot enable switch is connected to the power supply bus, and the other end is connected to the pilot switch status input end of the main controller, one end of the pilot solenoid valve is connected to the pilot signal output end of the main controller, and the other end is grounded, the data ports of the engine ECU, the emergency pump motor controller and the main controller are all connected to the data bus, and the PWM output port of the emergency pump status instrument is connected to the PWM input port of the emergency pump motor controller.

2. The emergency pump start protection device for a truck crane according to claim 1, characterized in that: The emergency pump status instrument includes a single chip microcomputer and an instrument display screen connected to the single chip microcomputer. The power input end of the single chip microcomputer is connected to the other end of the emergency pump switch, and the PWM output port of the single chip microcomputer is connected to the input port of the emergency pump motor controller.

3. The emergency pump start protection device for a truck crane according to claim 2, characterized in that: The data port of the single chip microcomputer is connected to the data bus.

4. The emergency pump start protection device for a truck crane according to claim 1, characterized in that: A power supply battery and a key start switch are connected in series on the power supply bus, the negative pole of the power supply battery is grounded, the positive pole of the power supply battery is connected to one end of the key start switch, and the power input end of the engine ECU, the power input end of the emergency pump motor controller, the power input end of the main controller, one end of the emergency pump switch and one end of the pilot enable switch are all connected to the other end of the key start switch.

5. The emergency pump start protection device for a truck crane according to claim 1, characterized in that: The grounding terminals of the engine ECU, the emergency pump status instrument, the emergency pump motor controller and the master controller are all grounded.

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