阅读说明：本技术 一种装载机及其延时断电控制装置和控制方法 (Loader and delayed power-off control device and control method thereof ) 是由 黄二静 董雯雯 侯卓磊 邱楚然 李夏宇 王苏东 耿睿 侯璐 江云鹤 刘洲 张宁 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种延时断电控制装置,包括控制器、第一继电器和第二继电器,装载机尿素箱内设置有尿素液位传感器和尿素温度传感器,尿素箱连接有回流管和加热管路,加热管路上设置有尿素加热电磁阀,回流管上设置有尿素箱回流管加热装置；控制器接收装载机整车开关状态信号,以及尿素温度传感器和尿素液位传感器的输出信号,控制器根据尿素温度传感器和尿素液位传感器传输的信号,控制第一继电器和第二继电器线圈的得电和失电。本发明还公开一种延时断电控制装置的控制方法。本发明公开的一种装载机及其延时断电控制装置和控制方法,能够解决装载机因整车断电造成的尿素管及喷嘴堵塞,导致发动机无法正产启动的技术问题。(The invention discloses a delayed power-off control device which comprises a controller, a first relay and a second relay, wherein a urea liquid level sensor and a urea temperature sensor are arranged in a urea box of a loader; the controller receives the on-off state signals of the whole loader and the output signals of the urea temperature sensor and the urea liquid level sensor, and controls the power on and power off of the first relay coil and the second relay coil according to the signals transmitted by the urea temperature sensor and the urea liquid level sensor. The invention also discloses a control method of the delayed power-off control device. The invention discloses a loader and a delayed power-off control device and a control method thereof, which can solve the technical problem that an engine cannot be started in a normal production mode due to blockage of a urea pipe and a nozzle of the loader caused by power-off of a whole vehicle.)

1. A time delay outage controlling means which characterized in that: the device comprises a controller (1), a first relay (2) and a second relay (3), wherein a urea liquid level sensor (11) and a urea temperature sensor (9) are arranged in a urea box of the loader, the urea box is connected with a return pipe and a heating pipeline, a urea heating electromagnetic valve (8) is arranged on the heating pipeline, and a urea box return pipe heating device (7) is arranged on the return pipe; controller (1) receives loader whole car switch (10) state signal, and the output signal of urea temperature sensor (9) and urea level sensor (11), controller (1) basis the signal of urea temperature sensor (9) and urea level sensor (11) transmission, control first relay (2) and second relay (3) coil gain of electricity and lose the electricity, the contact of first relay (2) is connected on the power supply circuit of urea case back flow heating device (7), the contact of second relay (3) is connected on the power supply circuit of urea heating solenoid valve (8).

2. The delayed power-off control device as claimed in claim 1, wherein: the controller (1) is connected with an indicator lamp (4).

3. The delayed power-off control device as claimed in claim 1, wherein: and a safety box (6) is connected between the second relay (3) and the urea box return pipe heating device (7).

4. The delayed power-off control device as claimed in claim 1, wherein: the urea box heating electromagnetic valve (8) is a switch valve.

5. The delayed power-off control device as claimed in claim 1, wherein: the whole vehicle switch (10) is a normally open contact type switch; the first relay (2) contact connected to the power supply circuit of the urea box return pipe heating device (7) and the second relay (3) contact connected to the power supply circuit of the urea heating electromagnetic valve (8) are normally open contacts respectively.

6. The delayed power-off control device as claimed in claim 1, wherein: the power supply (5) is used for supplying power to the first relay (2), the second relay (3) and the controller (1).

7. A loader characterized in that: comprising the delayed power down control device of any of claims 1 to 9.

8. A control method of the delayed power-off control device as claimed in any one of claims 1 to 6, characterized in that: the method comprises the following steps:

s01, receiving a low level signal sent when the vehicle switch (10) is switched off;

s02, analyzing and processing the low level signal, and determining that the delayed power-off device needs to be started when the whole vehicle is powered off;

s03, two high-level signals are output to the first relay (2) and the second relay (3) respectively, coils of the first relay (2) and the second relay (3) are controlled to be electrified, normally open contacts of the first relay (2) and the second relay (3) are closed, and a power supply (5) supplies power to the return pipe heating device (7) and the urea heating electromagnetic valve (8);

and S04, controlling the opening and closing of the urea box return pipe heating device (7) and the urea box heating electromagnetic valve (8) according to the received signals of the urea temperature sensor (9) and the urea liquid level sensor (11).

9. The control method of the delayed power-off control device according to claim 8, wherein: the process that the controller (1) controls the urea box heating electromagnetic valve (8) in S04 is as follows:

step a, receiving an analog quantity liquid level signal detected by a urea liquid level sensor (11);

step b, filtering the analog quantity liquid level signal to remove interference signals;

step c, converting the analog quantity liquid level signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete liquid level curve;

and f, comparing and analyzing the liquid level value on the discrete liquid level curve with a preset value, controlling the coil of the first relay (2) to be powered off when the liquid level value is smaller than the preset value, and otherwise controlling the coil of the first relay (2) to be powered on.

10. The control method of the delayed power-off control device according to claim 8, wherein: s04 the process that the controller (1) controls the urea box return pipe heating device (7) is as follows:

step a, receiving an analog quantity temperature signal detected by a urea temperature sensor (9);

step b, filtering the analog quantity temperature signal to remove an interference signal;

step c, converting the analog quantity temperature signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete temperature curve;

and f, comparing and analyzing the temperature value on the discrete temperature curve with a preset value, controlling the coil of the second relay (3) to be powered on when the temperature value is smaller than the preset value, and otherwise controlling the coil of the second relay (3) to be powered off.

Technical Field

The invention relates to a delayed power-off control device and a delayed power-off control method for a loader, and belongs to the technical field of engineering vehicle control.

Background

Along with the rapid development of social economy and the general improvement of the living standard of people, the requirement of the whole society on environmental protection is higher and higher, and the requirement on the tail gas emission standard of engineering vehicles is higher and higher, so that the national IV and European V emission standards of the engineering vehicles are in line with each other. The urea is used as a raw material necessary for the post-treatment system of national IV and European V emission standards of engineering vehicles, and the normal and stable delivery of the urea to the post-treatment system of the engineering vehicles is particularly important. Because the engineering vehicle does not have the direct power failure of time delay after the operation is accomplished, urea case heating solenoid valve can close immediately, back flow heating device stop heating, and the urea of remaining in urea case nozzle department can crystallize, blocks up urea nozzle and pipeline, and urea just can't carry whole car aftertreatment system again when leading to reuse, can lead to whole car aftertreatment system inoperative finally, and the unable normal use of whole car.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a loader, a delayed power-off control device and a control method thereof, which can solve the technical problem that an engine cannot be normally started due to blockage of a urea pipe and a nozzle of the loader caused by power-off of the whole vehicle.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a time-delay power-off control device of a loader comprises a controller, a first relay and a second relay, wherein a urea liquid level sensor and a urea temperature sensor are arranged in a urea box of the loader; the controller receives the on-off state signal of the whole loader and the output signals of the urea temperature sensor and the urea liquid level sensor, the controller controls the power on and power off of the first relay and the second relay coil according to the signals transmitted by the urea temperature sensor and the urea liquid level sensor, the contact of the first relay is connected to the power supply loop of the urea box return pipe heating device, and the contact of the second relay is connected to the power supply loop of the urea heating electromagnetic valve.

The controller is connected with an indicator light.

And a safety box is connected between the second relay and the heating device of the urea box return pipe.

The urea box heating electromagnetic valve is a switch valve.

The whole vehicle switch is a normally open contact switch.

The first relay contact connected to the power supply loop of the urea box backflow pipe heating device and the second relay contact connected to the power supply loop of the urea heating electromagnetic valve are normally open contacts respectively.

The power supply supplies power for the first relay, the second relay and the controller.

A loader comprises the loader delayed power-off control device.

A control method of a delayed power-off control device of a loader is characterized by comprising the following steps: the method comprises the following steps:

receiving a low level signal sent when a switch of a whole vehicle is switched off;

analyzing and processing the low level signal, and determining that a delayed power-off device needs to be started when the whole vehicle is powered off;

outputting two high-level signals to a first relay and a second relay respectively, controlling coils of the first relay and the second relay to be electrified, closing normally open contacts of the first relay and the second relay, and supplying power to a backflow pipe heating device and a urea heating electromagnetic valve by a power supply;

and step four, controlling the opening and closing of a heating device of a return pipe of the urea box and a heating electromagnetic valve of the urea box according to the received signals of the urea temperature sensor and the urea liquid level sensor.

Step four, the process of controlling the urea box heating electromagnetic valve by the controller is as follows:

step a, receiving an analog quantity liquid level signal detected by a urea liquid level sensor;

step b, filtering the analog quantity liquid level signal to remove interference signals;

step c, converting the analog quantity liquid level signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete liquid level curve;

and f, comparing and analyzing the liquid level value on the discrete liquid level curve with a preset value, controlling the coil of the first relay to be powered off when the liquid level value is smaller than the preset value, and otherwise controlling the coil of the first relay to be powered on.

Step four, the process of controlling the heating device of the return pipe of the urea box by the controller is as follows:

step a, receiving an analog quantity temperature signal detected by a urea temperature sensor;

step b, filtering the analog quantity temperature signal to remove an interference signal;

step c, converting the analog quantity temperature signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete temperature curve;

and f, comparing and analyzing the temperature value on the discrete temperature curve with a preset value, controlling the coil of the second relay to be powered on when the temperature value is smaller than the preset value, and otherwise controlling the coil of the second relay to be powered off.

The invention has the beneficial effects that:

1. the controller is connected with a switch of the whole vehicle, the controller is connected with a coil control end of a first relay and a urea liquid level sensor, the controller is connected with a coil control end of a second relay and a urea temperature sensor, and only when the controller detects that no power supply signal is input through the switch, the controller controls the urea heating electromagnetic valve to be opened and the urea return pipe heating device to heat; therefore, after the power supply is powered off, the urea in the pipeline completely flows back into the urea box, and the blockage of the urea pipeline is prevented.

2. The invention adopts the urea temperature sensor to monitor the temperature of the urea in the urea box, transmits the urea temperature signal to the controller, and processes the signal through the controller, thereby achieving the effect of real-time control of the controller on the heating device of the return pipe of the urea box.

3. The urea level sensor monitors the urea liquid level in the urea box, the urea liquid level signal is transmitted to the controller, the signal is processed by the controller, and when the urea liquid level is lower than the low level of the set range, the controller controls the reflux pipe heating device to stop heating, so that the effect of stopping the interlocking control is achieved.

4. A fuse box is additionally arranged between the relay contact end and the backflow pipe heating device, so that overload of the control circuit caused by transitional heating of the backflow pipe heating device is avoided, and the whole heating system is protected.

5. The control method for controlling the urea box heating electromagnetic valve and the urea box return pipe heating device by the controller has the advantages of larger data acquisition amount, better filtering effect, faster and more accurate data processing.

Drawings

Fig. 1 is a schematic view of a frame connection structure of a delayed power-off control device of a loader according to the present invention.

The reference numbers in the figures are as follows: 1-a controller; 2-a first relay; 3-a second relay; 4-an indicator light; 5-a power supply; 6-fuse box; 7-a reflux pipe heating device; 8-urea heating electromagnetic valve; 9-urea temperature sensor; 10-a switch of the whole vehicle and 11-a urea liquid level sensor.

Detailed Description

The present invention is further described with reference to the accompanying drawings, and the following examples are only for clearly illustrating the technical solutions of the present invention, and should not be taken as limiting the scope of the present invention.

As shown in figure 1, the invention discloses a delayed power-off control device of a loader, which comprises a controller 1, a first relay 2, a second relay 3, an indicator lamp 4, a power supply 5, a fuse box 6, a return pipe heating device 7, a urea heating electromagnetic valve 8, a urea temperature sensor 9, a whole vehicle switch 10 and a urea liquid level sensor 11. The urea box heating electromagnetic valve 8 is a switch valve, and the whole vehicle switch 10 is a normally open contact switch. The controller 1 is connected with an indicator lamp 4, and the indicator lamp 4 is turned off after the switch 10 of the whole vehicle is turned off for a certain time. The controller 1 is connected with a whole vehicle switch 10, and the power supply for a certain time is continuously output after the power supply is cut off by the controller through logic control. A urea liquid level sensor 11 and a urea temperature sensor 9 are arranged in a urea box of the loader, the urea box is connected with a return pipe and a heating pipeline, a urea heating electromagnetic valve 8 is arranged on the heating pipeline, and a urea box return pipe heating device 7 is arranged on the return pipe; controller 1 receives loader whole car switch 10 status signal to and urea temperature sensor 9 and urea level sensor 11's output signal, controller 1 is according to the signal of urea temperature sensor 9 and urea level sensor 11 transmission, the first relay 2 of control and the 3 coils of second relay get the electricity and lose the electricity, the contact of first relay 2 is connected on the power supply circuit of urea case back flow heating device 7, the contact of second relay 3 is connected on the power supply circuit of urea heating solenoid valve 8. The power supply 5 supplies power to the first relay 2, the second relay 3, and the controller 1. The contact of the first relay 2 connected to the power supply loop of the urea box return pipe heating device 7 and the contact of the second relay 3 connected to the power supply loop of the urea heating electromagnetic valve 8 are normally open contacts respectively.

A safety box 6 is connected between the second relay 3 and the urea box return pipe heating device 7, so that overload caused by introduction of control circuit due to transition heating of the return pipe heating device 7 is avoided, and the whole heating system is protected. Urea level sensor 11 gathers urea case liquid level signal and feeds back to controller 1, and urea temperature sensor 9 gathers urea case urea temperature and feeds back to controller 1. In order to facilitate installation and later maintenance, all hardware are installed through threads; the input and output of the signal are transmitted by the wire.

The invention also discloses a loader, which comprises the loader delayed power-off control device.

The invention also discloses a control method of the delayed power-off control device of the loader, which comprises the following steps:

firstly, a controller 1 receives a low level signal sent when a vehicle switch 10 is switched off;

step two, the controller 1 analyzes and processes the low level signal to confirm that the power failure of the whole vehicle needs to start the delayed power failure device;

step three, the controller 1 outputs two high level signals to the first relay 2 and the second relay 3 respectively, and controls coils of the first relay 2 and the second relay 3 to be electrified, so that normally open contacts of the first relay 2 and the second relay 3 are closed, and the power supply 5 supplies power to the backflow pipe heating device 7 and the urea heating electromagnetic valve 8;

and step four, the controller 1 controls the opening and closing of the urea box return pipe heating device 7 and the urea box heating electromagnetic valve 8 according to the received signals of the urea temperature sensor 9 and the urea liquid level sensor 11 respectively.

In the fourth step, the process of controlling the urea box heating electromagnetic valve 8 by the controller 1 is as follows:

step a, receiving an analog quantity liquid level signal detected by a urea liquid level sensor 11;

step b, filtering the analog quantity liquid level signal to remove interference signals;

step c, converting the analog quantity liquid level signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete liquid level curve;

and f, comparing and analyzing the liquid level value on the discrete liquid level curve with a preset value, controlling the coil of the first relay 2 to be powered off when the liquid level value is smaller than the preset value, and otherwise controlling the coil of the first relay 2 to be powered on.

Wherein, the process that the controller 1 controls the urea box return pipe heating device 7 in the fourth step is as follows:

step a, receiving an analog quantity temperature signal detected by a urea temperature sensor 9;

step b, filtering the analog quantity temperature signal to remove an interference signal;

step c, converting the analog quantity temperature signal into a hexadecimal digital signal by A/D conversion;

d, sampling and analyzing the converted digital signals, carrying out numerical processing, then carrying out numerical authenticity verification, and removing unstable digital signals to obtain stable and accurate digital signals;

e, digitally arranging the acquired stable and accurate digital signals to obtain a discrete temperature curve;

and f, comparing and analyzing the temperature value on the discrete temperature curve with a preset value, controlling the coil of the second relay 3 to be powered on when the temperature value is smaller than the preset value, and otherwise controlling the coil of the second relay 3 to be powered off.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.