CN201884183U - Fuel supply advance angle measurement system of engine - Google Patents
Fuel supply advance angle measurement system of engine Download PDFInfo
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- CN201884183U CN201884183U CN2010206549698U CN201020654969U CN201884183U CN 201884183 U CN201884183 U CN 201884183U CN 2010206549698 U CN2010206549698 U CN 2010206549698U CN 201020654969 U CN201020654969 U CN 201020654969U CN 201884183 U CN201884183 U CN 201884183U
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- pressure sensor
- advance angle
- fuel supply
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- signal processing
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Abstract
The utility model relates to a fuel supply advance angle measurement system of an engine, and the engine comprises a fuel supply pipe and a gear ring fixed on an output shaft. The measurement system is characterized in that: the measurement system comprises a rotation speed sensor for measuring the rotation speed of the gear ring, a fuel pressure sensor for measuring the pressure of the fuel supply pipe, a signal processing module and a microprocessor unit, the output ends of both the rotation spend sensor and the fuel pressure sensor are connected with the input end of the signal processing module, and the output end of the signal processing module is connected with the input port of the microprocessor unit. Since the system is provided with the rotation speed sensor, the fuel pressure sensor, the signal processing module and the microprocessor unit, the system can accurately measure the fuel supply advance angle by means of rotation speed signals and pressure signals; and a clamping type fuel pressure sensor can be adopted as the fuel pressure sensor, so that mounting and detection are convenient. The system also can carry out no-load power measurement, cylinder uniformity detection and other detection on the diesel engine.
Description
Technical field
The utility model relates to a kind of engine oil advance angle measuring system, in particular, relates in particular to a kind of engine oil advance angle measuring system that is provided with oil pressure sensor and speed probe.
Background technique
Diesel engine plays a part very important in national economy and daily life, owing to each component movement complexity, work under bad environment etc., various faults takes place easily, causes enormous economic loss directly or indirectly.
Fuel supply advance angle is meant that injection pump plunger begins to close into, spill port the time be carved into the crank angle that piston arrives diesel engine top dead center is experienced.The fuel supply advance angle of diesel engine is the important parameter of diesel engine fuel feeding combustion system, mainly influences motor Economy, power character, emission performance.Fuel supply advance angle is excessive, and this not only increases, and the compression negative work makes that fuel consumption rate increases, power descends, and rough running, and rough idle is difficult to start, and easily forms soot; Fuel supply advance angle is too small, then fuel consumption rate and increased exhaust temperatures, and engine overheat is prone to during starting and emits white cigarette phenomenon.Different Under Different Work Condition of Engine, fuel supply advance angle should have corresponding suitable value, and therefore, the realization fuel supply advance angle is quick and precisely measured even more important.Produce at present and generally adopt oil spilling method, flicker method, vibratory drilling method etc. to detect fuel supply advance angles in safeguarding, exist error big, can't dynamic measurement or shortcoming such as the online detection inconvenience of automobile.
Summary of the invention
The utility model provides a kind of engine oil advance angle measuring system that is provided with oil pressure sensor and speed probe in order to overcome the shortcoming of above-mentioned technical problem.
Engine oil advance angle measuring system of the present utility model, described motor comprises fuel supply line and the gear ring that is fixed on the output shaft, its specialization is: described measuring system comprises the speed probe that is used to measure the gear ring rotating speed, the oil pressure sensor that is used to measure fuel supply line pressure, signal processing module and microprocessing unit, the output terminal of described speed probe and oil pressure sensor all is connected with the input end of signal processing module, and the output terminal of described signal processing module is connected with the input port of microprocessing unit.Speed probe by with the cooperating of gear ring, can realize measurement to the output shaft rotating speed; Oil pressure sensor can be realized the measurement to fuel supply line pressure by matching with fuel supply line, so that accurately measure the waveform of supply time section; Signal processing module is used for fuel supply line pressure signal and gear ring tach signal are carried out processing such as filtering amplification, carries out computing and processing in the microprocessing unit so that be input to.
Engine oil advance angle measuring system of the present utility model comprises the display device that is used for video data that is connected with microprocessing unit and carries out the data memory storing that described microprocessing unit is connected with PC by communication interface.Display device can carry out the demonstration of operation result, so that the user carries out reading of corresponding data; Storage is used for the storage to data.By being connected of microprocessor and PC, can give PC the data upload that measuring system of the present utility model records.
Engine oil advance angle measuring system of the present utility model, described speed probe and oil pressure sensor are respectively magnetoelectricity speed probe and clipping oil pressure sensor.The magnetoelectricity speed probe can be realized non-contact tachometric survey accurately, and clipping oil pressure sensor is easy to install, is convenient to quick measurement.
Engine oil advance angle measuring system of the present utility model, the tach signal of described speed probe output after operational amplifier amplifies again through logical operation; The fuel injection pressure signal of described oil pressure sensor output amplifies through two-stage calculation amplifier filtering.Tach signal is carried out logical operation again after computing is amplified, realized tach signal is converted into the square signal that single-chip microcomputer is easy to measure, realized the accuracy and the real-time of transient speed are measured.
The beneficial effects of the utility model are: engine oil advance angle measuring system of the present utility model, be provided with speed probe, oil pressure sensor, signal processing module and microprocessing unit, realized accurate measurement fuel supply advance angle by tach signal and pressure signal; Oil pressure sensor in the utility model can adopt clipping oil pressure sensor, make sensor installation and detect convenient, when having reduced the sensor cost and make to detect not affected by environment.
Description of drawings
Fig. 1 is the structural representation of engine oil advance angle measuring system of the present utility model;
Fig. 2 is engine oil advance angle measuring principle of measurement system figure of the present utility model;
Fig. 3 is the schematic diagram of signal processing module of the present utility model;
Fig. 4 is the graph of a relation of Cylinder Pressure of Diesel Engine, transient speed and crank angle;
The pressure primary signal schematic representation of the fuel supply line that Fig. 5 records for oil pressure sensor;
Fig. 6 is the fuel supply line pressure signal schematic representation after signal processing module is handled;
Fig. 7 is that fuel injection pressure signal and tach signal concern schematic representation.
Among the figure: 1 speed probe, 2 gear rings, 3 fuel supply lines, 4 oil pressure sensors, 5 signal processing modules, 6 microprocessing units, 7 PCs, 8 display devices, 9 storagies, 10 communication interfaces, 11 series type fuel injection pressure signals, 12 clipping fuel injection pressure signals, 13 speed waveform, 14 fuel feeding waveforms, 15 transient speed waveforms, 16 cylinder pressure waveforms.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
At first, in conjunction with Fig. 4, be the relation that example is set forth transient speed minimum point and piston top dead center with the graph of a relation of Cylinder Pressure of Diesel Engine, transient speed and crank angle.By shown in transient speed waveform 15 and cylinder pressure waveform 16 as can be seen, when the piston of a cylinder moves near the compression top center, two, the piston of three, four cylinders will walk to respectively near expansion lower dead center, air inlet lower dead center, the exhaust top dead center, because the gas pressure that at this moment acts on the piston is very little, the moment sum that these cylinders act on the bent axle also just can be ignored.Therefore, near a cylinder compression top center, the gas pressure that acts on moment of torsion on the bent axle and mainly be by a cylinder produces.In budc, the moment of torsion that cylinder pressure produces is opposite with the crank sense of rotation, cause transient speed to reduce, After Top Center, the moment of torsion that cylinder pressure produces is identical with the crank sense of rotation, impels transient speed to increase again, if there is no friction, the minimum point of transient speed will appear at the top dead center place, and Here it is utilizes transient speed to determine the theoretical foundation of top dead center.
As depicted in figs. 1 and 2, the structural representation and the schematic diagram of engine oil advance angle measuring system of the present utility model have been provided respectively, it comprises speed probe 1, oil pressure sensor 4, signal processing module 5, microprocessing unit 6, PC 7, display device 8, storage 9, communication interface 10, shown motor comprises fuel supply line 3 and flywheel ring gear 2, and shown speed probe 1 is for the magnetoelectricity speed probe and can realize non-contact measurement to gear ring 2; Oil pressure sensor 4 is clipping oil pressure sensor, in the process of using, can realize to fuel supply line 3 in the measurement of fuel injection pressure signal, its installation and use very convenient.Signal processing module 5 is used to realize the amplification and the processing of fuel injection pressure signal and tach signal, so that the signal after transforming is input in the microprocessing unit 6, as shown in Figure 3, provided the schematic diagram of signal processing module 5, after the tach signal process operational amplifier amplification by speed probe 1 output, via carrying out computing,, the tach signal after handling is sent into the interrupt interface of microprocessing unit 6 again so that be converted into the square wave level signal that microprocessing unit 6 is easy to measure with door; The fuel injection pressure signal of the fuel injection pressure signal output of oil pressure sensor 4 outputs carries out two-stage signal through two operational amplifiers and amplifies, and between first order operational amplifier and second level operational amplifier, coupling capacitance C1 is set, capacitor C 2 is used for fuel injection pressure signal is carried out filtering, be input to the A/D module interface of microprocessing unit 6 at last, so that 6 pairs of fuel injection pressure signals of microprocessing unit transform and computing.Microprocessing unit 6 can adopt single-chip microcomputer, realize operation of data and with the communication of upper PC, and cost is lower.Display device 8 is used for the computing structure is shown, so that the inspector observes data; Storage 9 can be realized the storage of intermediate data and result data, and microprocessing unit 6 can be realized communication with PC 7 by communication interface 10, so that measuring system of the present utility model can be given PC the data upload that records.
Fig. 5 has provided the schematic representation of the primary signal of fuel supply line pressure, it comprises many high-frequency interferencing signals, fuel injection pressure signal schematic representation after Fig. 6 has provided and handled through signal processing module 5 and the schematic representation that adopts the fuel injection pressure signal that the serial connection oil pressure sensor records, Fig. 5 and Fig. 6 are compared, and the fuel injection pressure signal amplitude after as seen handling through signal processing module 5 is big, interference is little and be convenient to sampling.Series type fuel injection pressure signal 11 among Fig. 5 and clipping fuel injection pressure signal 12 are compared, and visible clipping oil pressure sensor can obtain accurately real fuel injection pressure signal.This shows, adopt this engine oil advance angle measuring system can obtain measurement result accurately, through experimental results demonstrate that measuring accuracy is at ± 0.5 ° of CA.
Engine oil advance angle measuring system of the present utility model should notice that clipping oil pressure sensor is installed on the fuel supply line of motor cylinder to be measured, the magnetoelectricity speed probe is installed on the flywheel ring gear place in the process of using; Unscrew the oil nozzle of cylinder to be measured, so that make diesel oil not spray in the cylinder; After connecting and having detected system, in start-up system; Restart motor and can obtain current cylinder engine oil advance angle value.After detection is finished, tighten loose oil nozzle and get final product.
Engine oil advance angle measuring system of the present utility model, also can realize detection to the various performance parameters of motor, utilize magnetoelectricity speed probe 1 and clipping oil pressure sensor 4 to obtain tach signal and fuel injection pressure signal, by obtaining diesel engine transient speed collection of illustrative plates and fuel feeding waveform after the signal processing module processing 5, diesel engine speed, power test with no external load, starting performance, acceleration performance, speed adjusting performance, each cylinder sealing and the inhomogeneity detection of working can be realized after the process microprocessing unit is handled computing, and real-time demonstration, storage and the communication etc. of testing result can be realized.This system has validity height, easy for installation, advantage such as expansivity is strong, can be applicable to experiment, the on-the-spot detection and motor car engine detection of dynamic etc., satisfies the needs of scientific research, teaching and production, maintenance all departments.
The method of measurement of engine oil advance angle measuring system of the present utility model is described below in conjunction with Fig. 7.The number of teeth that might as well establish gear ring is
, fuel supply advance angle is
, its specialization is, may further comprise the steps:
(1) obtains maximum oil pressure signal value, in a work cycle of motor, with the cycle be fuel injection pressure signal
Sampled signal gather and the force value that at every turn obtains of record
, establish maximum value and be
, establish force value
The pairing signals collecting time is
(2) oil pressure and tach signal are measured, in next one circulation, when being measured, also tach signal is measured fuel injection pressure signal, and record fuel injection pressure signal and tach signal, the transient speed of establishing respective teeth is
(3) look for synchronous points, with fuel injection pressure signal with
Compare, if
＜
＜
, basis then
,
With
Numerical value utilize interpolation calculation to go out
The time point that takes place in this work cycle, establishing this time point is synchronous points
If
=
, synchronous points then
=
, wherein 0＜
＜1;
(4) ask for minimum point and starting point, utilize the data fitting algorithm to obtain the minimum point of transient speed waveform, establish the pairing time of minimum point and be
Utilize interpolation to be made as in the hope of the elapsed time of fuel supply line fuel feeding
(5) set parameter, establish from
Arrive
In time period, the whole tooth that gear ring turned over is
Individual; From
Arrive
In time period, the whole tooth that gear ring turned over is
Individual;
(6) ask angle, when
, utilize interpolation calculation to go out at ≠ 0 o'clock
With
Divide and be clipped to
During first tooth and the angle that gear ring is turned over during last tooth, be designated as respectively in the individual tooth
With
When
=0 o'clock, utilize interpolation calculation go out from
Arrive
The angle that the time period ring gear is turned over is made as
(7) ask angle, utilize interpolation calculation to go out
With
Divide and be clipped to
During first tooth and the angle that gear ring is turned over during last tooth, be designated as respectively in the individual tooth
With
(8) ask fuel supply advance angle, utilize following formula to calculate fuel supply advance angle to be
:
Further, in order to guarantee to obtain comparatively accurate survey data, the minimum point time algorithm described in synchronizing time point algorithm described in the step (3) and the step (4) adopts secondary or above interpolation algorithm and secondary or the above data fitting algorithm of secondary of secondary respectively; Described
,
,
,
With
Adopt once in the calculation process or once above interpolation algorithm.During tach signal described in the step (2) is measured, comprise that the number of teeth and the engine cylinder number according to gear ring utilizes the nonrecursion lowpass digital filter of Fourier series method design that it is carried out digital filtering.
When the microprocessor employing has the processor of A/D modular converter and interrupt interface, at first the signal after handling through signal processing module is sent into the A/D interface of microprocessing unit, the signal after signal processing module is handled is sent into the interrupt interface of microprocessing unit.Measure the principle of transient speed and the characteristics of signal processing module according to magnetoelectric transducer, interrupt register is set rising edge and is interrupted, and is the time that twice generation interrupted with two teeth on the timer 0 record gear ring; Fuel injection pressure signal is gathered with fixed sampling frequency with timer 1 control A/D modular converter, can be determined the time lag between fuel feeding waveform two sampled points thus.Change characteristics according to the motor transient speed signals, can think that gear ring two between cog transient speeds are constant, promptly the mean speed of two between cog can be thought the transient speed of two between cog.Thus, can calculate motor transient speed waveform.According to engine operation characteristic and structure, as the flywheel teeth number of turns, engine cylinder number etc., utilize the Fourier series method to design corresponding nonrecursion lowpass digital filter transient speed signals is carried out Shelving, interference such as effective deburring.
In order to improve measuring accuracy, can take following measure:
On device is selected: at the particular surroundings of native system, choose high anti-interference chip, all select the automotive grade chip such as all chips.On circuit design: except finishing specific function, also will take into full account stability, the anti-interference of circuit in the circuit design process, as filtering measures etc.Watchdog circuit is set: in the system of practical application, very likely because of generation program " race flies " or " deadlock " phenomenon of being interfered, the house dog design can effectively address this problem and improve the automatic recovery ability of system to microcontroller when program running.
Example recited above only is that the utility model preferred implementation is described; be not that design of the present utility model and scope are limited; under the prerequisite that does not break away from the utility model design philosophy; engineers and technicians make the technical solution of the utility model in related domain various distortion and improvement all should belong to protection domain of the present utility model.
Claims (4)
1. engine oil advance angle measuring system, described motor comprises fuel supply line (3) and is fixed in gear ring (2) on the output shaft, it is characterized in that: described measuring system comprises the speed probe (1) that is used to measure the gear ring rotating speed, the oil pressure sensor (4) that is used to measure fuel supply line pressure, signal processing module (5) and microprocessing unit (6), the output terminal of described speed probe and oil pressure sensor all is connected with the input end of signal processing module, and the output terminal of described signal processing module is connected with the input port of microprocessing unit.
2. engine oil advance angle measuring system according to claim 1, it is characterized in that: comprise the display device that is used for video data (8) that is connected with microprocessing unit and carry out data memory storing (9), described microprocessing unit (6) is connected with PC by communication interface (10).
3. engine oil advance angle measuring system according to claim 1 and 2 is characterized in that: described speed probe (1) and oil pressure sensor (4) are respectively magnetoelectricity speed probe and clipping oil pressure sensor.
4. engine oil advance angle measuring system according to claim 1 and 2 is characterized in that: the tach signal of described speed probe output after operational amplifier amplifies again through logical operation; The fuel injection pressure signal of described oil pressure sensor output amplifies through two-stage calculation amplifier filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206549698U CN201884183U (en) | 2010-12-13 | 2010-12-13 | Fuel supply advance angle measurement system of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206549698U CN201884183U (en) | 2010-12-13 | 2010-12-13 | Fuel supply advance angle measurement system of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201884183U true CN201884183U (en) | 2011-06-29 |
Family
ID=44181722
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206549698U Expired - Fee Related CN201884183U (en) | 2010-12-13 | 2010-12-13 | Fuel supply advance angle measurement system of engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN201884183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112668419A (en) * | 2020-12-17 | 2021-04-16 | 太原理工大学 | Engine emission prediction method based on vibration signal |
-
2010
- 2010-12-13 CN CN2010206549698U patent/CN201884183U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112668419A (en) * | 2020-12-17 | 2021-04-16 | 太原理工大学 | Engine emission prediction method based on vibration signal |
| CN112668419B (en) * | 2020-12-17 | 2022-05-24 | 太原理工大学 | Engine emission prediction method based on vibration signal |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110629 Termination date: 20121213 |