CN2400594Y

CN2400594Y - Computer screen display tester for checking fuel-injection pump of diesel engine

Info

Publication number: CN2400594Y
Application number: CN 99256586
Authority: CN
Inventors: 程启
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-15
Filing date: 1999-12-15
Publication date: 2000-10-11
Anticipated expiration: 2009-12-15

Abstract

The utility model belongs to fuel injection pump checking and repairing equipment of a diesel engine, which comprises a stroke sensor, a main shaft corner sensor, a diesel supplying time sensor, an analogdigital converter, and a computer. The main shaft corner sensor and the fuel supplying time sensor are connected with the computer; the stroke sensor is connected with the computer through the analogdigital converter; the stroke sensor is connected with a fuel quantity control rod of a tested injection pump; the main shaft corner sensor is installed on a motive power output main shaft; the fuel supplying time sensor is installed at one end of a fuel injection device. The utility model can rapidly, exactly, and visually measure and display the parameter of the injection pump in a rotary speed changing operating mode, which is good for realizing the good matching of the fuel injection pump and the engine under any rotary speed, and the drainage and the motive power performance of the engine are reduced.

Description

The computer screen of injecting fuel of diesel motor pump verification shows testing apparatus

The utility model belongs to automobile service equipment, is used for verification of injecting fuel of diesel motor pump and repairing.

Injecting fuel of diesel motor pump (hereinafter to be referred as jet pump) is the heart of diesel engine, and its performance condition is directly connected to the Economy and the power character of motor.The fuel-flow control throw of lever uses dial gauge to detect and observation in the jet pump verification at present, and the fuel supply advance angle degree uses stroboscope to detect.The parameter that this method of calibration detected is lost comprehensive, the dynamic performance of jet pump and contingent fault in the time of can't detecting the variable speed operating mode, need the parameter of adjustment more scattered in the verification, misadjustment can often occur and leak transferring, thereby influence working efficiency and increase repair rate.

The purpose of this utility model is to provide the computer screen of a kind of injecting fuel of diesel motor pump verification to show testing apparatus, it can be transformed into computer data with the fuel-flow control throw of lever of jet pump and jet pump single cylinder fuel supply advance angle degree and test stand spindle speed in the variable speed situation, on screen with the form of curve show fuel-flow control mark stroke with the rule of rotation speed change and or fuel supply advance angle read rule with rotation speed change.

The utility model comprises that mainly sensor, analog-digital converter and computer are formed constantly for stroke sensor, angle of eccentricity sensor, fuel feeding; The stroke sensor range is not less than 25m, constitute by potentiometric displacement transducer or inductive displacement transducer, with be connected by the fuel-flow control bar of verification fuel oil injectionpump, the shift motion of fuel-flow control bar is transformed into voltage signal, output signal is exported to computer by analog-digital converter.The angle of eccentricity sensor receives triode by light emitting diode, photoelectricity and blanking disc constitutes, blanking disc is installed on the test stand power output main shaft, the angle of eccentricity sensor is transformed into voltage pulse signal with a light pulse on every Mondays of main shaft, as main shaft zero signal and test stand main axis rotation periodic signal, send computer to.Fuel feeding sensor constantly is made up of piezoelectric constant and oil pipe folder, be installed on the test stand high-pressure oil pipe near standard oil feeder one end, high-pressure oil pipe vibration when receiving this cylinder and beginning fuel feeding, the output ripple voltage signal, after shaping as the single cylinder fuel feeding constantly signal send computer to.Computer is fuel-flow control throw of lever signal, main axis rotation periodic signal, main shaft zero signal and single cylinder fuel feeding moment signal from analog-digital converter, after carrying out computing, with the form of curve on computer screen, show the fuel-flow control throw of lever with the rule of rotation speed change and or the fuel supply advance angle degree with the rule of rotation speed change.

Advantage of the present utility model is to measure quickly and intuitively and to show the jet pump parameter of variable speed operating mode, make jet pump verification work quick, accurate, help realizing the matched well of fuel oil injectionpump and motor under any rotating speed, with the discharging that reduces motor with improve its power character.

The utility model is described with reference to the accompanying drawings as follows:

Fig. 1 is a theory diagram of the present utility model; Fig. 2 is an overall installation schematic representation of the present utility model; Fig. 3 is the stroke sensor scheme of installation; Fig. 4 is an angle of eccentricity sensor construction schematic representation; Fig. 5 is a fuel feeding sensor construction schematic representation constantly; Fig. 6 is a fuel-flow control throw of lever curve; Fig. 7 is the fuel supply advance angle line of writing music.

As shown in the figure, Fig. 1 has described angle of eccentricity sensor 2 and has linked to each other with computer 5 with fuel feeding moment sensor 3, and stroke sensor 1 is connected with computer 5 by analog-digital converter 4.Fig. 2 has described the installation that connects on the utility model and the existing test stand 6.Stroke sensor 1 be connected by the fuel-flow control bar 13 of verification jet pump 7, angle of eccentricity sensor 2 is installed on the test stand 6 power output main shaft 21, fuel feeding sensor 3 constantly is installed in high-pressure oil pipe 8 near standard oil feeder 9 one ends, and each signal of sensor links to each other with analog-digital converter 4 and computer 5 by conjunction cable 10.Stroke sensor 1 is made of potentiometric displacement transducer and sees Fig. 3 among this embodiment, range is 25mm, fixing by sensor stand 12, the magnetic attraction of its mobile core bar 11 by magnetic patch 14 with linked to each other by the fuel-flow control bar 13 of verification jet pump and follow mobile, the potential voltage of output signal is changed, realize the conversion of displacement amount to voltage, carry out the measuring accuracy that 12 analog-to-digital conversion can reach 0.02mm by analog-digital converter 4, the continuous detecting fuel-flow control throw of lever can draw fuel-flow control throw of lever curve with change in rotational speed.The angle of eccentricity sensor construction is seen Fig. 4, it is by light emitting diode 17, photoelectricity accepts triode 18 and blanking disc 19 is formed, wherein blanking disc 19 is installed on the test stand power output main shaft 21, and blanking disc 19 is having an aperture 20 with phototube radius corresponding position, when main axis rotation, can accept the weekly switching pulse signal of triode 18 outputs by photoelectricity, this signal is used to calculate fuel supply advance angle as the main shaft zero signal on the one hand, the time lag of measuring adjacent pulse simultaneously can draw the test stand period of rotation, and then calculating test stand rotating speed, the tachometric survey scope of present embodiment is Orpm～4000rpm, measuring accuracy is 0.1rpm, and display precision is 1rpm.Fuel feeding sensor construction is constantly seen Fig. 5, it is made up of piezoelectric constant 15 and oil pipe folder 16, be clamped and fastened on the high-pressure oil pipe 8 by oil pipe folder 16, the pressure that produces in the high-pressure oil pipe when this oil supply cylinder begins is given piezoelectric constant 15 by 16 conduction of oil pipe folder, because vibration pressure produces voltage pulse on piezoelectric constant 15 surfaces, give computer 5 as fuel feeding moment signal pulse by conjunction cable, this signal and main shaft zero signal are carried out time ratio can draw the oil supply angle of this cylinder with respect to the main shaft zero-bit, carry out time ratio time reference and adopt computer 5 internal clockings, the oil supply angle that continuous measurement shifts to an earlier date with rotating speed can draw the fuel supply advance angle line of writing music.

The fuel-flow control throw of lever curve that 24 computer screens of the utility model when being middle jet pump verification show among Fig. 6, abscissa 22 be the jet pump rotating speed, and unit is rpm, and y coordinate 23 is that stroke is marked in fuel-flow control, and unit is mm.

The fuel supply advance angle of 26 jet pumps of being furnished with oil supply angle automatic advancing device that show for present embodiment computer screen when the jet pump verification line of writing music among Fig. 7, abscissa 22 be the jet pump rotating speed, and unit is rpm, and y coordinate 25 be a fuel supply advance angle, and unit spends.

Claims

1. the computer screen of injecting fuel of diesel motor pump verification shows testing apparatus, it is characterized in that it comprises that sensor (3), analog-digital converter (4) and computer (5) are formed constantly for stroke sensor (1), angle of eccentricity sensor (2), fuel feeding; Angle of eccentricity sensor (2) links to each other with computer (5) with fuel feeding moment sensor (3), and stroke sensor (1) is connected with computer (5) by analog-digital converter (4); Stroke sensor (1) be connected by the fuel-flow control bar (13) of verification jet pump (7), angle of eccentricity sensor (2) is installed on test stand (6) the power output main shaft (21), fuel feeding sensor (3) constantly is installed in high-pressure oil pipe (8) near standard oil feeder (9) one ends, and each signal of sensor links to each other with analog-digital converter (4) and computer (5) by conjunction cable (10).

2. the computer screen according to the verification of the said injecting fuel of diesel motor pump of claim 1 shows testing apparatus, it is characterized in that said stroke sensor (1) is that potentiometric displacement transducer or inductive displacement transducer constitute, range is not less than 25mm, fixing by sensor stand (12), the magnetic attraction of its mobile core bar (11) by magnetic patch (14) with linked to each other by the fuel-flow control bar (13) of verification jet pump and follow mobile.

3. the computer screen according to the verification of the said injecting fuel of diesel motor pump of claim 1 shows testing apparatus, it is characterized in that said angle of eccentricity sensor (2) is accepted triode (18) by light emitting diode (17), photoelectricity and blanking disc (19) is formed, wherein blanking disc (19) is installed on the test stand power output main shaft (21), and blanking disc (19) is having an aperture (20) with phototube radius corresponding position.

4. the computer screen according to the verification of the said injecting fuel of diesel motor pump of claim 1 shows testing apparatus, it is characterized in that said fuel feeding moment sensor presss from both sides (16) by piezoelectric constant (15) and oil pipe and forms, be clamped and fastened on the high-pressure oil pipe (8) by oil pipe folder (16).