Method for automatically detecting working device state of sanitation vehicle

Abstract

The invention relates to a method for automatically detecting the state of a working device of a sanitation vehicle. Measuring a motor input side current detection value; finding out a current table look-up value from the rotating speed-current calibration database, and setting a confidence interval of the table look-up value; subtracting the current look-up table value from the current detection value, and judging whether the obtained value is within a confidence interval or not; if the obtained value is within the confidence interval, the state is normal, and no prompt is given; if the obtained value is not in the confidence interval, the instrument prompts that the vehicle nozzle is blocked if the obtained value is higher than the set value of the confidence interval, and the instrument prompts that the nozzle needs to be replaced if the obtained value is lower than the set value of the confidence interval. Nozzle state prompting is achieved, regular detection is omitted, and manpower is saved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sanitation vehicles, and particularly relates to a method for automatically detecting the state of a working device of a sanitation vehicle. BACKGROUND

[0002] Sanitation vehicles are equipped with electric fluid devices, such as water pumps in a washing and sweeping vehicle to supply water to nozzles. After long-term use of the working device of a sanitation vehicle, there is a risk that foreign matter will block the nozzles, resulting in a decrease in the effective area of the nozzles. In addition, after long-term operation of the nozzles, the effective area of the nozzles will also increase due to the wear of the fluid on the nozzles. As consumables of the working device, the nozzles need to be regularly maintained and replaced. Under the existing state, the nozzles need to be regularly detected by manual work to determine whether the nozzles need to be replaced, which consumes manpower. SUMMARY

[0003] To solve the above technical problems, the present application provides a method for automatically detecting the state of a working device of a sanitation vehicle to solve the problem that the nozzles need to be regularly maintained and replaced by manual work under the existing state.

[0004] The specific scheme is as follows: A method for automatically detecting the state of a working device of a sanitation vehicle, comprising a working device, a vehicle controller and a vehicle-end database, the method comprising the following steps: S1): establishing a speed-current calibration database in the vehicle-end database and setting a confidence interval of a lookup table value; S2): setting a target speed of the working device by the vehicle controller, the working device being provided with a motor controller and a motor, the motor controller driving the motor to operate at the set target speed; S3): finding a corresponding current lookup table value from the speed-current calibration database according to the speed of the working device; S4): measuring a current detection value on the input side of the motor, subtracting the current lookup table value from the current detection value to obtain a current difference value, the current difference value being used as feedback state data; S5): judging the relationship between the feedback state data and the confidence interval If the feedback state data is within the confidence interval of the lookup table value, it indicates that the state of the nozzle is normal, and no prompt is given. If the obtained feedback state data is not within the confidence interval of the lookup table value, the size relationship between the feedback state data and the confidence interval is judged. If the feedback state data is greater than the set value of the confidence interval, the vehicle controller controls the instrument to prompt that the nozzle of the vehicle is blocked; if the feedback state data is less than the set value of the confidence interval, the vehicle controller controls the instrument to prompt that the nozzle needs to be replaced.

[0005] The rotation speed-current calibration database includes motor rotation speed values and motor input side current values, and the corresponding motor input side current values are searched through the motor rotation speed values, and the motor input side current values are current table value.

[0006] The setting of the table value confidence interval is determined according to a plurality of real vehicle test databases.

[0007] The rotation speed-current calibration database is a multi-dimensional database, and the multi-dimensional database includes rotation speed, voltage, fluid pressure and current, and the corresponding current value is searched according to the rotation speed, voltage or fluid pressure.

[0008] The present application establishes a rotation speed-current calibration database, and after the target running rotation speed of the working device is set, the motor running rotation speed and current change caused by the nozzle state change of the working device are judged by comparing the motor input side current measurement value and the table value, and the motor rotation speed and the flow of the fluid sprayed by the nozzle are related to each other, the motor rotation speed increases, the current input on the motor side also increases, and the flow of the water sprayed by the nozzle also increases; the difference between the current detection value and the current table value is used as state feedback data, the relationship between the state feedback data and the confidence interval is judged, the nozzle state feedback information is obtained, and whether the nozzle needs to be maintained or replaced is prompted on the instrument, thereby saving the cost of manual time detection. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a process schematic diagram of the present application. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments of the present application are within the scope of protection of the present application.

[0011] A method for automatically detecting the state of a working device of a sanitation vehicle, comprising a working device, a vehicle controller and a vehicle end database, the method comprising the following steps: S1): establishing a rotation speed-current calibration database in the vehicle end database, and setting a confidence interval of a table value; the setting of the table value confidence interval is determined according to a plurality of real vehicle test databases; The confidence interval is a method of interval estimation in statistics, and the interval [a, b] represents the error range of the sample estimation of the population mean, and the exact values of a and b contain the confidence degree of the result that the population mean has.

[0012] S2): the whole vehicle controller sets a target rotating speed for the working device, a motor controller and a motor are arranged in the working device, the motor controller drives the motor to run at the set target rotating speed; in the embodiment, the motor in the working device is arranged in the water pump, the water pump is driven to supply water to the nozzle, the rotating speed of the motor increases, the input side current of the motor increases accordingly, and the water flow rate sprayed by the nozzle also increases.

[0013] S3): according to the rotating speed of the working device, corresponding current lookup table values are found from a rotating speed-current calibration database; S4): a motor input side current detection value is measured, the current detection value is subtracted from the current lookup table value to obtain a current difference value, and the current difference value is taken as feedback state data; the detection of the motor input side current value is obtained by a current sampling circuit or a current meter.

[0014] S5): the relationship between the feedback state data and the confidence interval is judged If the feedback state data is within the confidence interval of the lookup table value, it is indicated that the nozzle state is normal, and no prompt is given; If the feedback state data is not within the confidence interval of the lookup table value, the size relationship between the feedback state data and the confidence interval is judged, If the feedback state data is greater than the confidence interval setting value, the whole vehicle controller controls the instrument to prompt that the vehicle nozzle is blocked; if the feedback state data is less than the confidence interval setting value, the whole vehicle controller can control the instrument to prompt that the nozzle needs to be replaced.

[0015] The rotating speed-current calibration database includes motor rotating speed values and motor input side current values, corresponding motor input side current values are found through the motor rotating speed values, and the motor input side current values are current lookup table values.

[0016] The rotating speed-current calibration database is a multi-dimensional database, the multi-dimensional database includes rotating speed, voltage, fluid pressure and current, and corresponding current values are found according to the rotating speed, voltage or fluid pressure.

[0017] In the embodiment, the corresponding current values can also be found through the fluid pressure or the motor voltage, the greater the fluid pressure, the greater the rotating speed of the motor, the corresponding motor current also increases, and the water flow rate sprayed by the nozzle increases; and the rotating speed of the motor also has a linear relationship with the voltage at both ends of the motor, the rotating speed of the motor is proportional to the applied voltage, that is, when the voltage increases, the rotating speed of the motor also increases accordingly.

[0018] The application establishes a rotating speed-current calibration database, after the operating device sets the target operating rotating speed, the motor input side current measurement value and the table value are compared to judge the motor operating rotating speed and current change caused by the nozzle state change of the operating device, the motor rotating speed and the nozzle fluid flow are related, the motor rotating speed increases, the motor input current also increases, and the nozzle water flow also increases; The current detection value and the current table value are subtracted as state feedback data, the relationship between the state feedback data and the confidence interval is judged to obtain the nozzle state feedback information, and whether to maintain or replace the nozzle is prompted on the instrument, thereby saving the cost of manual time detection.

[0019] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principle of the application, a number of improvements and refinements can be made, which are also considered as the protection scope of the application.

Claims

1. A method for automatically detecting the status of a working device on a sanitation vehicle, characterized in that: The method, which includes a working device, a vehicle controller, and a vehicle-side database, comprises the following steps: S1): Establish a speed-current calibration database in the vehicle-side database and set the confidence interval for the lookup table values; S2): The vehicle controller sets the target speed for the working device. The working device is equipped with a motor controller and a motor. The motor controller drives the motor to run at the set target speed. S3): Based on the operating device's rotational speed, retrieve the corresponding current lookup value from the speed-current calibration database; S4): Measure the current detection value on the input side of the motor, subtract the current lookup table value from the current detection value to obtain the current difference value, and use the current difference value as feedback status data; S5): Determine the relationship between the feedback status data and the confidence interval. If the feedback status data is within the confidence interval of the lookup table value, it indicates that the nozzle status is normal and there is no prompt. If the obtained feedback status data is not within the confidence interval of the lookup table value, determine the relationship between the feedback status data and the confidence interval. If the feedback status data is greater than the confidence interval setting value, the vehicle controller will control the instrument panel to indicate that the vehicle nozzle is clogged; if the feedback status data is less than the confidence interval setting value, the vehicle controller will control the instrument panel to indicate that the nozzle needs to be replaced.

2. The method for automatically detecting the status of the working device of sanitation vehicles according to claim 1, characterized in that: The speed-current calibration database includes motor speed values ​​and motor input current values. The corresponding motor input current value is found by looking up the motor speed value. The motor input current value is a current lookup table value.

3. The method for automatically detecting the status of the working device of sanitation vehicles according to claim 1, characterized in that: The confidence interval for the lookup table value is determined based on a database of multiple real-vehicle tests.

4. The method for automatically detecting the status of the working device of a sanitation vehicle according to claim 1: the speed-current calibration database is a multi-dimensional database, which includes speed, voltage, fluid pressure and current, and the corresponding current value is found according to the speed, voltage or fluid pressure.

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