CN104515887A - HIL rack high-voltage MeUn valve current acquisition method - Google Patents
HIL rack high-voltage MeUn valve current acquisition method Download PDFInfo
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- CN104515887A CN104515887A CN201310455208.8A CN201310455208A CN104515887A CN 104515887 A CN104515887 A CN 104515887A CN 201310455208 A CN201310455208 A CN 201310455208A CN 104515887 A CN104515887 A CN 104515887A
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Abstract
The invention discloses an HIL rack high-voltage MeUn valve current acquisition method. The HIL rack high-voltage MeUn valve current acquisition method includes the following steps that: the characteristic parameters of an MeUn valve are measured through an EFS, and a statistical table, with the duty ratio of driving signals of the MeUn valve defined as an X value, the voltage of a storage battery defined as a Y value, and the feedback current value of the MeUn valve as a Z value, is established; the statistical table is led into an HIL fuel oil metering unit valve model; and an HIL simulation test system acquires the duty ratio of the driving signals of the MeUn valve and the voltage of the storage battery through an I/O board card, and the statistical table is inquired according to an MeUn valve model in HIL, so that the average value of the feedback current of the MeUn valve is obtained. With the acquisition method of the invention adopted, complicated calculation can be avoided, and the complexity and operational time of an HIL simulation model can be decreased, and the validity of data can be ensured.
Description
Technical field
The present invention relates to vehicle electric field, particularly relate to a kind of HIL(hardware in loop) stand high pressure MeUn(oil pump metering units) valve current acquisition method.
Background technology
After on-board engine electronic control unit (ECU) design terminates, need the System Functional Test carried out in case of a closed loop in all directions.In order to shorten the construction cycle, saving cost of development, adopting hardware in loop (HIL) test to be a kind of effective means.
In diesel oil high-pressure common rail engine, high-pressure oil pump for improving fuel pressure, thus realizes high-pressure injection, improves fuel atomization effect, makes fuel oil Thorough combustion.MeUn valve in high-pressure oil pump is for controlling oil inlet quantity and capacity of returns, and control oil pump plunger to the fuel delivery of common rail pipe, thus meets the pressure demand of common rail system setting, jointly completes the closed-loop control to rail pressure with rail pressure sensor.
The high-pressure oil pump MeUn valve electric current gathered in HIL, for calculating rail pressure and the fuel consumption of oil piping system, in order to ensure to calculate accuracy, has requirement to the precision of gathered Meun valve electric current.
Tradition gathers the way of Meun valve electric current: when carrying out HIL emulation testing by the feedback current of AD converter Real-time Collection MeUn valve, through calculating the mean value of MeUn valve feedback current.Shortcoming is as follows:
1, the formula of calculating current mean value (such as
) logic is complicated, causes that the complexity of model emulation is high, long operational time.
2, performance period of MeUn valve feedback current and the HIL emulated execution cycle fixing, and relatively, so sampled point less (the such as MeUn valve feedback current cycle is 5ms, HIL emulation cycle is 1ms, can only gather at most 5 points) in a Meun valve current cycle;
Greatly (such as saw-tooth wave type), the mean value error of the MeUn valve feedback current calculated is large, can not reflect real current values for the change of MeUn Real-time Feedback current values.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of model simple high precision HIL stand high pressure MeUn valve current acquisition method.
For solving the problems of the technologies described above, HIL stand high pressure MeUn valve current acquisition method of the present invention, comprising:
One, by EFS(oil pump experiment table) measure MeUn valve characteristic parameter, set up with MeUn valve drive signal dutycycle for X value, battery tension is Y value, and MeUn valve feedback current is the statistical form of Z value; X value and Y value crossover location in statistical form is Z value;
Two, described statistical form is imported in HIL fuel metering unit valve model;
Three, HIL emulation test system gathers dutycycle and the battery tension of MeUn valve drive signal by I/O board, and statistical form according to the MeUn valve pattern query in HIL fuel metering unit valve model, obtains the mean value of MeUn valve feedback current.
Wherein, in step one, EFS measures MeUn characterisitic parameter and adopts:
1) fixing MeUn valve drive signal dutycycle is 4%, arranges battery tension from 7500mv to 15500mv, and step-length is 500mv change, gathers the numerical value of each MeUn valve feedback current respectively;
2) increase MeUn valve drive signal dutycycle with 2% step-length, repeat the test of step 1), until MeUn valve drive signal dutycycle is to 74%.
HIL stand high pressure MeUn valve current acquisition method of the present invention only needs after HIL stand gathers MeUn valve drive signal dutycycle and battery tension by IO board, then inquires about and measure MeUn valve characteristic parameter by EFS and obtain the feedback current that statistical form can draw MeUn valve.Avoid complicated calculating, decrease complexity and the working time of HIL realistic model.Described statistical form data are from oil pump experiment table measured result, and EFS testing table is the professional stand of oil piping system test, ensure that the validity of data.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation:
Fig. 1 is the calculation process schematic diagram of one embodiment of the invention.
Embodiment
As shown in Figure 1, HIL stand high pressure MeUn valve current acquisition method one embodiment of the present invention, comprising:
One, MeUn valve characteristic parameter is measured by EFS, set up with MeUn valve drive signal dutycycle as X value (walking crosswise), battery tension is Y value (perpendicular row), MeUn valve feedback current is the statistical form of Z value, in statistical form, crossover location is Z value, as shown in table 1 for X value (walking crosswise) and Y value (perpendicular row):
Table 1
Wherein, EFS measures the employing of MeUn characterisitic parameter:
1) fixing MeUn valve drive signal dutycycle is 4%, arranges battery tension from 7500mv to 15500mv, and step-length is 500mv change, gathers the numerical value of each MeUn valve feedback current respectively;
2) increase MeUn valve drive signal dutycycle with 2% step-length, repeat the test of step 1), until MeUn valve drive signal dutycycle is to 74%.
Two, described statistical form is imported in HIL fuel metering unit valve model;
Three, HIL emulation test system gathers dutycycle and the battery tension of MeUn valve drive signal by I/O board, and statistical form according to the MeUn valve pattern query in HIL fuel metering unit valve model, obtains the mean value of MeUn valve feedback current.
Below through the specific embodiment and the embodiment to invention has been detailed description, but these are not construed as limiting the invention.Without departing from the principles of the present invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (2)
1.HIL stand high pressure MeUn valve current acquisition method, is characterized in that, comprising:
One, measure MeUn valve characteristic parameter by EFS, set up with MeUn valve drive signal dutycycle for X value, battery tension is Y value, and MeUn valve feedback current is the statistical form of Z value;
Two, described statistical form is imported in HIL fuel metering unit valve model;
Three, HIL emulation test system gathers dutycycle and the battery tension of MeUn valve drive signal by I/O board, and statistical form according to the MeUn valve pattern query in HIL fuel metering unit valve model, obtains the mean value of MeUn valve feedback current.
2. HIL stand high-pressure oil pump metering units valve current acquisition method as claimed in claim 1, is characterized in that:
In step one, EFS measures MeUn characterisitic parameter and adopts:
1) fixing MeUn valve drive signal dutycycle is 4%, arranges battery tension from 7500mv to 15500mv, and step-length is 500mv change, gathers the numerical value of each MeUn valve feedback current respectively;
2) increase MeUn valve drive signal dutycycle with 2% step-length, repeat the test of step 1), until MeUn valve drive signal dutycycle is to 74%.
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| CN201310455208.8A CN104515887B (en) | 2013-09-29 | 2013-09-29 | HIL rack high pressure MeUn valve current acquisition methods |
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| CN201310455208.8A CN104515887B (en) | 2013-09-29 | 2013-09-29 | HIL rack high pressure MeUn valve current acquisition methods |
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| CN104515887A true CN104515887A (en) | 2015-04-15 |
| CN104515887B CN104515887B (en) | 2018-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047975A (en) * | 2021-03-23 | 2021-06-29 | 无锡威孚高科技集团股份有限公司 | Control method of electric control pressure relief valve in diesel engine fuel system |
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| US20090037074A1 (en) * | 2007-08-03 | 2009-02-05 | Honda Motor Co., Ltd. | Control system for plant |
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| DE102007050859A1 (en) * | 2007-05-18 | 2008-11-20 | Mitsubishi Electric Corp. | Control device for an internal combustion engine |
| US20090037074A1 (en) * | 2007-08-03 | 2009-02-05 | Honda Motor Co., Ltd. | Control system for plant |
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| CN113047975A (en) * | 2021-03-23 | 2021-06-29 | 无锡威孚高科技集团股份有限公司 | Control method of electric control pressure relief valve in diesel engine fuel system |
| CN113047975B (en) * | 2021-03-23 | 2023-06-09 | 无锡威孚高科技集团股份有限公司 | Control method for electric control pressure relief valve in diesel engine fuel system |
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