CN201096622Y - Diesel combustion pressure dynamic collection system - Google Patents
Diesel combustion pressure dynamic collection system Download PDFInfo
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- CN201096622Y CN201096622Y CNU2007201033737U CN200720103373U CN201096622Y CN 201096622 Y CN201096622 Y CN 201096622Y CN U2007201033737 U CNU2007201033737 U CN U2007201033737U CN 200720103373 U CN200720103373 U CN 200720103373U CN 201096622 Y CN201096622 Y CN 201096622Y
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Abstract
The utility model is an acquisition system which is used for the dynamic acquisition of the diesel combustion pressure and is mainly applied to the dynamic acquisition and data processing of the diesel combustion pressure. The whole acquisition system comprises a combustion pressure acquisition device, a signal processing circuit and a computer used for monitoring; the acquisition system is indicated in diagram 1. The acquisition system adopts the local region acquisition method and provides proper working sequence for the digital signal processor; a minimized and integrated optical fiber pressure sensor outputs the voltage value and simplifies the acquisition auxiliary instrument; based on the single channel ADC 200K acquisition accuracy and the instruction execution speed of 40 Mega instructions/S (MIPS) of the digital signal processor, the acquisition and the complicated data processing operation of the combustion pressure are achieved. Based on the dynamic acquisition method which adopts the optical fiber pressure sensor and the digital signal processor, the vehicle online acquisition and data processing of the diesel combustion pressure are realized. The computer monitors the working condition of the diesel engine well through the communication interface.
Description
Technical field:
The present invention relates to the Engine Block Test technical field, be mainly used in detection of diesel engine dynamic fault and the electronic Control for Diesel Engine technology.
Technical background:
Along with the raising of the energy and environmental requirement, various countries are strict day by day to the requirement of discharging.Executed Europe, Europe III Abgasgesetz will be carried out Europe V Abgasgesetz in 2008, and therefore the EPA Abgasgesetz that U.S.'s executed in 2004 is new reduces and discharge the top priority that has become in the diesel engine research.The electronic control injection system is by regulating injection timing and distributive value, reduce NOx and PM, the electronic control injection system is the necessary condition that the various advanced technologies of diesel engine (discharging post-processing technology, turbocharging technology, EGR technology etc.) are given full play to effect, also is the main means that improve engine power performance, economy and reduction discharging.
Present electronic Control for Diesel Engine is based on arteries and veins spectrum (MAP) control that experiment obtains, to the situation beyond the demarcation condition, as: fuel oil quality changes, part is aging, manufacturing variation etc., can not provide best control, can't make diesel engine operate in optimum condition.Along with the increase of controlling object, electric-control system becomes increasingly complex, and accurately control is very important, and closed-loop control is to realize the accurately effective way of control.The in-cylinder combustion situation has determined the performance and the discharging of diesel engine, cylinder pressure has comprised combustion position information, the cylinder pressure feedback is introduced electric-control system, can provide diesel engine combustion to indicate in real time, help to realize the diesel engine combustion closed-loop control, engine is carried out combustion position monitoring and fault diagnosis.
Conventional cylinder pressure collection is finished jointly by capture card and computing machine, the off-line analysis that comprises pressure acquisition and data, pressure acquisition system is made up of piezoelectric sensor, charge amplifier, capture card and computing machine, system attachment is many, disturbing factor is many, and it is difficult to satisfy the dynamic requirements of engine in system bulk and configuration.Combustion pressure dynamic collecting method based on digital signal processor (DSP), simplify the configuration of acquisition system, reduce system bulk, realize vehicle-mounted pressure acquisition and demonstration, not only the vehicle mounted failure of engine is detected significantly, and lay the foundation for the diesel engine electric control techniques of pressure feedback.
Summary of the invention:
The objective of the invention is to fill up the technological gap of vehicle-mounted diesel combustion pressure dynamic acquisition, finish pressure dynamic acquisition and data processing.
A kind of diesel combustion pressure dynamic collect system, comprise combustion pressure harvester, signal processing circuit and the microcomputer that is used to monitor, the combustion pressure harvester comprises fibre optic compression sensor and photoelectric encoder, and signal processing circuit comprises signal processor DSP56F807, power module, SCI or USB socket, debugging JTAG mouth, PWM output pin and I/O pin; Fibre optic compression sensor is connected with signal processor DSP56F807 through the A/D input pin in the signal processing circuit, photoelectric encoder is connected with signal processor DSP56F807 by filtering circuit, the IC input pin in the signal processing circuit, and the microcomputer that is used for monitoring is connected with the communication port of signal processor DSP56F807 by the SCI or the USB socket of signal processing circuit.
Whole acquisition system is made up of combustion pressure harvester, signal processing circuit and the microcomputer that is used to monitor, and the combustion pressure harvester mainly is made up of fibre optic compression sensor, photoelectric encoder.Fibre optic compression sensor adopts the AutoPSI-TC (temperature compensating type is fit to the engine dynamically pressure testing) of U.S. Optrand company, voltage 0.5-4.8V output.The linearity ± 1%FSO, measurement range 0-20MPa, temperature-50-300 ℃; Photoelectric encoder is an incremental encoder, has redesigned the grating dish, it is whenever rotated a circle produce 300 angle pulse signals, produces shown in the signal pulse accompanying drawing 3.Signal Z is a synchronizing signal, and output signal A is the corner signal every 0.5 degree output.
Signal processing circuit is selected the microprocessor of the digital signal processor DSP 56F807 of motorola inc as system for use, digital signal processor is a special microprocessor of handling live signal, the instruction execution speed height can reach 40,000,000 instruction/S (MIPS), can fix a point, Floating-point Computation.Multiply-add operation is commonly used calculating in the signal Processing in addition, though general purpose microprocessor also can carry out multiply-add operation, but the time is longer, employed DSP microprocessor among the present invention, multiplying order can be finished in the monocycle, computing velocity increases substantially, and is particularly suitable for the occasion of real-time processing requirements.
The data space of single-chip microcomputer is far smaller than computing machine, and the big young pathbreaker of data file directly has influence on the processing speed of microprocessor.In order to improve the data in real time processing power of acquisition system, in gatherer process, adopt the regional area acquisition method, the part circulation of working process of diesel engine is gathered, can reduce by 70% data volume such as only work by combustion being circulated to gather.
The cylinder pressure data that collect under high crank angle resolution condition are many, select the suitable data communication modes important.Under the cylinder pressure monitoring mode, some unique points on the transmission pressure curve, as maximum outbreak pressure and corner thereof, parameters such as burning initial point, transmitted data amount is little, adopts serial communication SCI mode can save CPU time; In the cylinder pressure drainage pattern, need to transmit the total data of combustion pressure, adopt USB mode energy high speed transmission data.
Beneficial effect:
Combustion pressure dynamic collect system based on digital signal processor (DSP), simplify the configuration of acquisition system, reduce system bulk, realize vehicle-mounted pressure acquisition and demonstration, not only the vehicle mounted failure of engine is detected significantly, and lay the foundation for the diesel engine electric control techniques of pressure feedback.
Description of drawings:
Fig. 1 is the systematic schematic diagram of diesel combustion pressure dynamic collect system
Fig. 2 is the working timing figure of diesel combustion pressure dynamic collect system
The pulse triggering signal that Fig. 3 produces for the photoelectricity demoder
Major part among the figure: fibre optic compression sensor 1a, photoelectric encoder 1b, signal processing circuit 2, microcomputer 3
Embodiment:
A kind of diesel combustion pressure dynamic collect system, comprise combustion pressure harvester, signal processing circuit and the microcomputer that is used to monitor, the combustion pressure harvester comprises fibre optic compression sensor and photoelectric encoder, and signal processing circuit comprises signal processor DSP56F807, power module, SCI or USB socket, debugging JTAG mouth, PWM output pin and I/O pin; Fibre optic compression sensor is connected with signal processor DSP56F807 through the A/D input pin in the signal processing circuit, photoelectric encoder is connected with signal processor DSP56F807 by filtering circuit, the IC input pin in the signal processing circuit, and the microcomputer that is used for monitoring is connected with the communication port of signal processor DSP56F807 by the SCI or the USB socket of signal processing circuit.
Shown in the systematic schematic diagram accompanying drawing 1 of diesel combustion pressure dynamic collect system, but utilize the fibre optic compression sensor measured pressure signal, through directly being converted to voltage signal output after the opto-electronic conversion, delivering to the A/D port of signal processing circuit changes, the A/D function of the footmark signal triggering signal processing circuit that photoelectric encoder produces is finished the data acquisition conversion, shown in the main working timing figure accompanying drawing 3, A/D gathers and starts from before upper dead canter 50CA, end at after top dead center 100CA, so-called regional area acquisition principle that Here it is, utilize signal processing circuit to finish homogenizing after A/D gathers and finishes and handle and Filtering Processing, and finish the calculating of unique point.
Signal processing circuit will be finished above-mentioned functions, just need control corresponding software, The software modular design method of the present invention, software is made up of initialization module, interrupt module and functional module, initialization module is mainly finished the initialization and the operating function initialization of Single Chip Microcomputer (SCM) system, interrupt module is mainly finished signal triggering, is implemented A/D collection and communication, and functional module is finished communication transmission, data processing and data computation task.After signal Processing finishes, the data communication method that determine to adopt according to the present mode of operation line data transmission of going forward side by side, in the cylinder pressure monitoring mode, only transmit some unique points on the pressure curve, as parameters such as maximum outbreak pressure and corner, burning initial points, the transmission data volume is little, adopts serial communication (SCI) mode can save CPU time; In the cylinder pressure drainage pattern, transmit the total data of combustion pressure, adopt USB mode high speed transmission data.Selected Cy7c68013 integrated functionality chip for use, the USB transceiver in (comprising 4KB FIFO) storer of RAM on its 16KB sheet and the sheet can be finished data storage and send at a high speed, can finish the high-speed transfer of combustion pressure data.
Claims (2)
1. diesel combustion pressure dynamic collect system, comprise combustion pressure harvester (1), signal processing circuit (2) and the microcomputer (3) that is used to monitor, combustion pressure harvester (1) comprises fibre optic compression sensor (1a) and photoelectric encoder (1b), and signal processing circuit (2) comprises signal processor DSP56F807, power module, SCI or USB socket, debugging JTAG mouth, PWM output pin and I/O pin; Fibre optic compression sensor (1a) is connected with signal processor DSP56F807 through the A/D input pin in the signal processing circuit (2), photoelectric encoder (1b) is connected with signal processor DSP56F807 by filtering circuit, the IC input pin in the signal processing circuit (2), and the microcomputer that is used for monitoring (3) is connected with the communication port of signal processor DSP56F807 by the SCI or the USB socket of signal processing circuit (2).
2. diesel combustion pressure dynamic collect system as claimed in claim 1 is characterized in that the data communication mode of operation adopts serial communication SCI or high-speed transfer USB to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201033737U CN201096622Y (en) | 2007-01-29 | 2007-01-29 | Diesel combustion pressure dynamic collection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201033737U CN201096622Y (en) | 2007-01-29 | 2007-01-29 | Diesel combustion pressure dynamic collection system |
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| Publication Number | Publication Date |
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| CN201096622Y true CN201096622Y (en) | 2008-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007201033737U Expired - Fee Related CN201096622Y (en) | 2007-01-29 | 2007-01-29 | Diesel combustion pressure dynamic collection system |
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| CN (1) | CN201096622Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493885A (en) * | 2011-12-14 | 2012-06-13 | 中国人民解放军装甲兵工程学院 | Electronic control system for combustion closed-loop control of diesel engine |
| CN102087168B (en) * | 2009-12-08 | 2012-09-05 | 中国船舶重工集团公司第七一一研究所 | Exhaust back pressure wave adjustment device for supercharged diesel engine |
| CN114323424A (en) * | 2021-12-13 | 2022-04-12 | 潍柴动力股份有限公司 | Dynamic responsiveness detection method and device, electronic device and storage medium |
-
2007
- 2007-01-29 CN CNU2007201033737U patent/CN201096622Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087168B (en) * | 2009-12-08 | 2012-09-05 | 中国船舶重工集团公司第七一一研究所 | Exhaust back pressure wave adjustment device for supercharged diesel engine |
| CN102493885A (en) * | 2011-12-14 | 2012-06-13 | 中国人民解放军装甲兵工程学院 | Electronic control system for combustion closed-loop control of diesel engine |
| CN114323424A (en) * | 2021-12-13 | 2022-04-12 | 潍柴动力股份有限公司 | Dynamic responsiveness detection method and device, electronic device and storage medium |
| CN114323424B (en) * | 2021-12-13 | 2023-09-19 | 潍柴动力股份有限公司 | Dynamic response detection method and device, electronic equipment and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20120129 |