CN105971976A - Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor - Google Patents
Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor Download PDFInfo
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- CN105971976A CN105971976A CN201610357566.9A CN201610357566A CN105971976A CN 105971976 A CN105971976 A CN 105971976A CN 201610357566 A CN201610357566 A CN 201610357566A CN 105971976 A CN105971976 A CN 105971976A
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- value
- hydraulic pressure
- pressure
- engineering machine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
Abstract
The invention relates to hydraulic pressure measurement methods and provides a method for measuring the hydraulic pressure of an engineering machine. By the adoption of the method for measuring the hydraulic pressure of the engineering machine, the problem that in the prior art, measurement of the hydraulic pressure of the engineering machine through a voltage type pressure sensor is not accurate is solved. The method comprises the following steps that when an engineering machine control system is powered on and an engine is not started, a controller obtains the actual sampling AD value Sad at the moment through the current output voltage of a pressure sensor, and the corresponding theoretical AD value SAD at the moment is obtained; a conversion coefficient k is calculated by comparing the actual sampling AD value Sad with the theoretical AD value SAD, wherein k=SAD/Sad; after the engine is started, a corrected AD value S'AD is calculated according to the actual sampling AD value Sad obtained by the controller through the pressure sensor, wherein S'AD=kSad; and the corrected AD value S'AD is converted into a pressure value. According to the method for measuring the hydraulic pressure of the engineering machine, the conversion coefficient k is calculated before the engineering machine operates, the corrected AD value S'AD is converted into the corresponding pressure value, the pressure value is more approximate to the true pressure value, measurement results are more accurate, and a better complete machine control effect and better complete machine performance are achieved.
Description
Technical field
The present invention relates to the measurement of a kind of hydraulic pressure, more particularly, it relates to a kind of method utilizing voltage-type pressure transducer survey engineering mechanical-hydraulic pressure.
Background technology
Pressure transducer is widely used in engineering machinery, gathers various hydraulic pressure value and is applied in the middle of various control.In existing hydraulic pressure measuring method, control system is all to preset a conversion coefficient k, and controller obtains actual samples AD value by voltage-type pressure transducer, by conversion coefficient k to SadIt is modified obtaining and revises AD value SAD, AD value S will be revisedADIt is converted into after the force value of correspondence for the computing of control system.
But, the working environment of engineering machinery is that comparison is severe, it will usually has influence on the acquisition precision of force value, and is desirable that in the case of many that the force value of collection is more accurate.Existing measuring method is changed coefficient k and only accounts for the factor of voltage-type pressure transducer itself, do not account for voltage-type pressure transducer and be arranged in engineering machinery because of the deviation caused by the environment residing for engineering machinery, controller can not effectively filter out the error of overall wire sheaves and controller circuitry itself and cause pressure acquisition value error relatively big when gathering the signal of pressure transducer, have influence on control effect and vehicle performance.
Summary of the invention
The technical problem to be solved in the present invention is to utilize voltage-type pressure transducer to measure the inaccurate problem of hydraulic pressure for existing engineering machinery, and provides a kind of and utilize the method for voltage-type pressure transducer survey engineering mechanical-hydraulic pressure to improve hydraulic pressure accuracy.
The present invention is such that providing a kind of method utilizing voltage-type pressure transducer survey engineering mechanical-hydraulic pressure for the technical scheme realizing its purpose, it is characterised in that comprise the steps:
S1: when work machine control system powers on but electromotor not yet starts, controller passes through pressure transducer output voltage now and obtains actual samples AD value S nowad, and obtain now corresponding theoretical AD value SAD；
S2: by actual samples AD value SadWith theoretical AD value SADCompare calculating conversion coefficient k, wherein k=SAD/Sad；
S3: after engine start, actual samples AD value S that controller is obtained by pressure transduceradAnd calculate correction AD value S'AD, wherein S'AD=kSad；
S4: AD value S' will be revisedADIt is converted into the force value of correspondence.
In the present invention, before engineering machinery works, calculate conversion coefficient k, and to actual samples AD value S obtained in engineering machine in working processadCarry out calculating obtaining and revise AD value S'AD, by revising AD value S'ADThe corresponding pressure value of conversion and true pressure value now closer to so that measurement result is the most accurate, thus realizes more preferable complete machine control effect and vehicle performance.
In the above-mentioned method utilizing voltage-type pressure transducer survey engineering mechanical-hydraulic pressure, the most also including whether the conversion coefficient k judging to calculate is within the scope of default, if conversion coefficient k is beyond the scope preset, conversion coefficient k takes system default value.
The present invention compared with prior art, in the present invention, calculates conversion coefficient k before engineering machinery works, thus passes through obtained correction AD value S'ADBe converted into corresponding force value and true pressure value now closer to so that measurement result is the most accurate, thus realizes more preferable complete machine control effect and vehicle performance.
Accompanying drawing explanation
Fig. 1 is the flow chart obtaining conversion coefficient k in the embodiment of the present invention.
Fig. 2 is the block diagram of control system in the embodiment of the present invention.
Fig. 3 is the electrical schematic of control system in the embodiment of the present invention.
Parts title and sequence number in figure:
On and off switch 1, electric lock activate switch 2, controller 3, speed probe 4, pressure transducer 5.
Detailed description of the invention
Specific embodiments is described below in conjunction with the accompanying drawings.
Voltage-type pressure transducer possesses following feature, pressure transducer can measuring pressure scope [0, P], P > 0；Corresponding output voltage signal scope [U1, U2], the theoretical output voltage values of sensor when U1 is pressure 0MPa, the theoretical output voltage values of sensor when U2 is pressure P MPa.So when 0MPa pressure, controller leads to the theoretical AD value of acquisition is SAD:
Wherein Q is coefficient, and value is 1023；U3 is the theoretical reference magnitude of voltage of controller AD sampling.
When hydraulic pressure value is 0MPa, the pressure transducer actual output voltage that controller obtains is U1+ Δ 1；The actual reference voltage value of controller AD sampling is U3+ Δ 3；The pressure transducer output voltage that wherein Δ 1 is acquired by controller and the deviation of theoretical value U1, Δ 3 represents the deviation of actual reference voltage when AD samples and theoretical reference magnitude of voltage U3.The actual samples AD value that now controller is obtained is Sad, then:
By formula 1 above and formula 2 it follows that SAD=kSad。
Wherein,K is the conversion coefficient that actual samples AD value is converted to theoretical AD value.
In the present embodiment, the calibration process of conversion coefficient k is as it is shown in figure 1, Guan Bi on and off switch 1 realizes power-up initializing；The engine speed obtained by electric lock switch 2 and engine speed sensor 4 afterwards judges whether electromotor is in starting state, think that electromotor is in inactive state when the rotating speed of electromotor is less than 500rpm, if thinking that electromotor is in starting state when rotating speed is higher than 500rpm.
If electromotor is in launch state, conversion coefficient k is not demarcated.
If electromotor is in inactive state, now system thinks that the pressure of surveyed hydraulic pressure is 0MPa, and controller 3 calculates actual samples AD value S now by the voltage now exportedad, obtain theoretical AD value S corresponding to 0MPa simultaneouslyADAnd calculate their ratio i.e. conversion coefficient k.If the value of calculation of k is beyond rational scope, i.e. beyond default reasonable value range, then it is assumed that there are errors in computation for this conversion value, conversion coefficient k system default value, for actual samples AD value SadWith correction AD value S'ADBetween conversion, it is to avoid because the unreasonable value of conversion coefficient k causes big error.If the value of calculation of k is at default reasonable value range, then use this conversion coefficient k for actual samples AD value SadWith correction AD value S'ADBetween conversion.The demarcation of conversion coefficient k is completed by above step.
In the present embodiment, as shown in Figure 2, when when on and off switch closes 1 conjunction, electric lock switch 2 disconnects, engineering machinery car load is in power-up state but time electromotor not yet starts, it is zero that engine speed sensor 4 obtains the tachometer value of output, the pump intake pressure of hydraulic system pressure such as hydraulic pump is 0MPa, and controller 3 passes through voltage-type pressure transducer 5 output voltage now and obtains actual samples AD value S nowad, and obtain theoretical AD value S corresponding during the 0MPa preset in control systemAD；Then by actual samples AD value SadWith theoretical AD value SADCompare and be calculated conversion coefficient k, wherein k=SAD/Sad。
Guan Bi electric lock switch, after engine start, actual samples AD value S that controller is obtained by the output voltage of pressure transduceradAnd calculate correction AD value S'AD, wherein S'AD=kSad；AD value S' will be revisedADIt is converted into the force value of correspondence.Demarcate conversion coefficient k by this method, and then obtain correction AD value S'ADSo that S'ADBe equivalent to the theoretical value under engineering machinery the present situation, with true pressure value now closer to so that measurement result is the most accurate, thus realizes more preferable complete machine and control effect and vehicle performance.
Claims (2)
1. the method utilizing voltage-type pressure transducer survey engineering mechanical-hydraulic pressure, it is characterised in that include as follows
Step:
S1: when work machine control system powers on but electromotor not yet starts, controller is by pressure transducer now defeated
Go out voltage and obtain actual samples AD value S nowad, and obtain now corresponding theoretical AD value SAD；
S2: by actual samples AD value SadWith theoretical AD value SADCompare calculating conversion coefficient k, wherein k=SAD/Sad；
S3: after engine start, actual samples AD value S that controller is obtained by pressure transduceradAnd calculate correction AD
Value S'AD, wherein S'AD=kSad；
S4: AD value S' will be revisedADIt is converted into the force value of correspondence.
The method utilizing voltage-type pressure transducer survey engineering mechanical-hydraulic pressure the most according to claim 1, its
It is characterised by whether the conversion coefficient k the most also including judging to calculate is within the scope of default, if turning
Change coefficient k and take system default value beyond the scope then conversion coefficient k preset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610357566.9A CN105971976A (en) | 2016-05-25 | 2016-05-25 | Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor |
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| CN201610357566.9A CN105971976A (en) | 2016-05-25 | 2016-05-25 | Method for measuring hydraulic pressure of engineering machine by means of voltage type pressure sensor |
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| CN105971976A true CN105971976A (en) | 2016-09-28 |
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Citations (9)
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Application publication date: 20160928 |