CN201526401U

CN201526401U - Electric control VE distribution pump for directly measuring advance angle by inductance sensor

Info

Publication number: CN201526401U
Application number: CN2009201381560U
Authority: CN
Inventors: 王九如
Original assignee: FUJIAN PUTIAN CHINAHANJI POWER Co Ltd
Current assignee: FUJIAN PUTIAN CHINAHANJI POWER Co Ltd
Priority date: 2009-05-11
Filing date: 2009-05-11
Publication date: 2010-07-14
Anticipated expiration: 2019-05-11

Abstract

The utility model relates to an electric control VE distribution pump for directly measuring an advance angle by an inductance sensor, which comprises a VE distribution pump with a mechanical speed regulator and an inductance type advance angle sensor, wherein, the inductance type advance angle sensor is mounted at a front end of the front end of the distribution outer housing of the VE distribution pump for directly measuring the starting time of the VE pump oil supply. On one hand, the utility model can increase the cam lift of the VE distribution pump to improve the oil supply pressure, on the other hand, the utility model can accurately control the oil supply advance angle by the electric control technology, the oil supply amount can be controlled by adopting the existing mechanical speed regulator, the EGR valve is matched to enable the diesel emission to achieve the Europe 3 standard, the electric control VE distribution pump has advantages of simple structure, low price and convenient maintenance.

Description

Directly survey the automatically controlled VE proportioning pump of advance angle with inductive pickup

Technical field

The utility model relates to a kind ofly controls fuel delivery with mechanical governor, and the automatically controlled VE proportioning pump of fuel supply advance angle is directly measured and controlled to inductive transducer.

Background technique

In order to make China's high-speed small-size diesel engine satisfy Europe 3 emission requests, adopting automatically controlled VE proportioning pump is to select preferably.Because China has produced VE proportioning pump more than ten years by batch, technology is ripe, and fittings supply and maintenance easily but still can't realize automatically controlledization of VE proportioning pump so far.

The model utility content

The purpose of this utility model is to provide a kind of automatically controlled VE proportioning pump of directly surveying advance angle with inductive pickup simple in structure, cheap, easy to maintenance.

Technical solutions of the utility model are as follows: it comprises VE proportioning pump, sensor, driving gear, high-speed electromagnetic valve, proportioning pump mounting plate, a TDCS TDC Sensor of directly surveying advance angle with inductance element of a band mechanical governor; It is characterized in that: the sensor of directly surveying advance angle with inductance element is installed in the front end that band mechanical governor VE proportioning pump distributes shell.

In order to measure the oil pump feed initial point, in the front portion of VE proportioning pump distribution shell, the barrel valve of a precision is installed directly, an end of barrel valve communicates with the proportioning pump plunger cavity, and the other end is equipped with the inductive transducer of measuring the barrel valve motion.When VE proportioning pump plunger moves upward, produce pressure at the plunger cavity intermediate fuel oil and make barrel valve rising 0.2-0.8 millimeter earlier, pushing up lid produces high pressure again and is assigned in each cylinder, the motor message of barrel valve is just outputed among the ECU (Electrical Control Unit) ECU by inductive transducer, machine is calculated as calculated, the declinate of engine tope center signal and these signals, then according to engine speed, temperature, parameters such as air pressure, by high-speed electromagnetic valve control advance angle piston stroke, thus the slewing area of control roller base, make diesel engine reach best fuel supply advance angle, its working principle is seen shown in Figure 1.Z is a cam angle among the figure, and K is the top dead center signal, and cam of injection pump whenever circles and produces a fixed signal relatively.P1 is the motor message of barrel valve, the cam of injection pump axle whenever circles, produce four signals (four cylinder oil pumps), changing then as advance angle, signal can change to P2 from P1, as long as angle T between the rising edge of barrel valve motion just can calculate fuel supply advance angle when measuring top dead center signal rising edge and a certain oil supply cylinder.

The utility model increases VE proportioning pump cam lift on the one hand, improves charge oil pressure, controls fuel supply advance angle accurately with electronic control technology on the other hand, the fuel supply rate curve that control is best,

Adopt existing mechanical speed regulator control fuel delivery, cooperate the EGR valve to make diesel emission reach Europe 3 standards.Automatically controlled VE proportioning pump of the present utility model is simple in structure, cheap, easy to maintenance.Can save huge development cost and time.

Below in conjunction with accompanying drawing the utility model structure and working principle are further specified.

Description of drawings

Fig. 1 is automatically controlled VE proportioning pump advance angle principle of measurement figure of the present utility model.

Fig. 2 is the automatically controlled VE proportioning pump structural drawing of the utility model band mechanical governor.

Fig. 3 is the schematic diagram of automatically controlled VE proportioning pump advance angle control of the present utility model.

VE proportioning pump, B inductance type advance angle sensor, C high-speed electromagnetic valve, D TDCS TDC Sensor, Z cam angle direction, K top dead center signal, P barrel valve motor message, the T fuel supply advance angle of A band mechanical governor among the figure; 1 transmission shaft; 2 oil transfer pumps; 3 roller base; 4 pins; 5 advancing device pistons; 6 rollers; 7 cam type surfaces; 8 cams; 9 piston springs; 10 sleeve oil outlets; 11 shell oil outlets; 12 control covers; 13 is fuel-displaced poor; 14 distribute sleeve; 15 outlet valves; 16 distribute plunger; 17 plunger cavities; 18 distribute shell; 19 distribute sleeve end face; 20 oil inlet holes; 21 spill ports; 22 hyperbaric chambers; 23 advance device springs; 24 low-pressure cavity; roller base sense of rotation during 25 injection advances; 26 cam rotation directions; 27 proportioning pump mounting plates; 28 transmitting gears; 29 magnet steel; 30 cylinder valve seats; 31 sensor overcoats; 32 barrel valves (the number in the figure position is wrong); 33 cylinder valve gaps; 34 spring seats; 35 springs; 36 riveting points; 37 briquettings; 38 protecting jackets; 39 conical surfaces; iron core in 40; 41 seal rings; 42 small sealing rings; 43 pads; 44 leads; 45 coils; 46 inner conical surfaces; 47 iron core sleeve; 48 Hall elements; 49 sensor outer housings; 50 setting sleeves; 51 screws; 52 clues.

Embodiment

As shown in Figure 1, 2, at distribution shell 18 front ends of mechanical speed governors VE proportioning pump A, inductance type advance angle sensor B is installed, advancing device piston 5 and high-speed electromagnetic valve C are equipped with in the oil pump bottom, and TDCS TDC Sensor D is installed on the proportioning pump mounting plate 27.Mechanical governor is used for regulating the oil pump feed amount in control control cover position.Fuel supply advance angle then passes through high-speed electromagnetic valve C by electronic control unit ECU, and provides the closed loop control signal by inductance type advance angle sensor B, TDCS TDC Sensor D, directly controls fuel feeding system advance angle.

Structure and the working principle of described top dead center signal emitter D are as follows: top dead center signal emitter D is the sensor that the Hall inductance element is housed.Hall inductance element 48 is installed in the sensor outer housing 49, and is fixed on the proportioning pump mounting plate 27 with setting sleeve 50 and screw 51, and the appropriate location on the driving gear 28 is equipped with a powerful magnet steel 29.When driving gear 28 rotates, can pass through clue 52 to control unit ECU output pulse signal during magnet steel 29 process Hall elements 48, thereby calculate the engine tope center position.Top dead center signal emitter D also can be directly installed on the suitable position of diesel engine cylinder block by the diesel engine requirement.

As shown in Figure 3, described inductance type advance angle sensor B is used for measuring fuel feeding zero hour.It is pressed on oil pump by sensor outer housing 31 with cylinder valve seat 30, barrel valve 32, cylinder valve gap 33 and distributes on the highi degree of accuracy end face 19 of sleeve.Cylinder valve seat 30 and barrel valve 32 are a pair of precision pairs, gap 0.001-0.004 millimeter.Barrel valve to-and-fro motion in cylinder valve seat and cylinder valve gap, the stroke 0.2-0.8 millimeter of barrel valve, cylinder valve seat 30 bottom surfaces also are high precision plane, to guarantee the sealing in the plunger cavity 17.Be provided with spring 35 in the shell 31, spring 35 is pressed in spring seat 34 and barrel valve 32 on the cylinder valve seat 30, and spring seat 34 the other ends are conical surfaces, the inner conical surface 46 in leaving on the iron core 40 apart from the 0.5-08 millimeter.Sensor outer housing 31 right-hand members are provided with

seal ring

41,42, to guarantee sealing.Inductive pickup is iron core 40 by the conical surface 39, interior iron core 40, the iron core sleeve 47 of spring seat 34 and in being contained in, coil 45 between the iron core sleeve 47 is formed, compact heap 37 is installed behind the inductive pickup,, inductive pickup is compressed in the riveted joint of end face 36 places of sensor outer housing 31.

When driving gear 51 drove oil pump drive spindle 1 rotation, transmission shaft 1 drove built-in oil transfer pump 2 and rotates, and fuel oil is pressurized to about 0.1～1Mpa.High pressure fuel leads in the hyperbaric chamber 22 of advancing device piston 5, as the power source of control advancing device piston 5 motions.Transmission shaft 1 also drives cam 8 simultaneously and plunger 16 rotates.Contact when the protruding profile 7 on the cam 8 turns to roller 6 in the roller base 3, plunger 16 just rises with cam 8, and produces high pressure fuel in plunger cavity 17.High-speed electromagnetic valve D is located between the

oilhole

20 and 21 of advancing device piston 5, controls the break-make of this two oilhole.Oilhole 20 connects the hyperbaric chamber 22 of piston 5, and oilhole 21 connects piston 5 the other end low-pressure cavity 24, and the return spring 23 of piston 5 is installed in the low-pressure cavity 24.

High-speed electromagnetic valve D cuts off this two oilhole when rotating speed rises, and hyperbaric chamber 22 intermediate fuel oil pressure can increase, and hydraulic coupling overcomes the active force that acts on piston 5 upper springs 23, and piston 5 is rotated roller base 3 by pin 4 to the direction of arrow 25 indications.Cam is pressed the direction transmission of arrow 26, be contained in the roller base 3 roller 6 in advance with cam 8 on protruding profile 7 contact, feeding plunger 16 rises in advance, in plunger cavity 17, form pressure, the active force that forces barrel valve 32 to overcome spring 35 rises, until push up cover 33 till (stroke about 0.2～0.5mm).Pressure continues to rise in the plunger cavity 17, and opens outlet valve 15 by distributing chute 13 and

oilhole

10,11, leads in the cylinder of diesel engine and goes.

When barrel valve 32 risings, the other end conical surface 39 of spring seat 34 makes the changes of magnetic field in the coil 45 produce pulse signal rapidly near the inner conical surfaces 46 of interior iron cores 40, is transferred to by clue 44 and carries out signal processing among the control unit ECU, measures fuel supply advance angle.If it is too big to calculate advance angle T, then ECU instructs high-speed electromagnetic valve C to open oil duct at once, fuel oil flows to the low-pressure cavity 24 of piston 5 through

oilhole

20,21 from the hyperbaric chamber 22 that shifts to an earlier date piston 5, hyperbaric chamber 22 intermediate fuel oil pressure reduce, return spring 23 is pushing away piston 5, drives the counter-rotation of roller base 3 to arrow 25 by pin 4.On the cam 8 the corner that contacts of protruding profile 7 and roller 6 postpone, plunger 16 and barrel valve 32 just postpone to rise, the signal delay that electromagnetic sensor sends passes among the ECU, top dead center that the ECU measuring meter is calculated along and barrel valve move that angle T reduces the fuel feeding time-delay between the signal of rising edge.Otherwise T is too little for fuel supply advance angle, and then ECU instructs high-speed electromagnetic valve C to close oil duct at once, and hyperbaric chamber 22 intermediate fuel oil pressure rise, and hydraulic pressure is pushing away piston 5, overcomes spring pressure and drives the direction rotation of roller base 3 to arrow 25 by pin 4.On the cam 8 protruding profile 7 and roller 6

The contact corner postpone, plunger 16 and barrel valve 32 just postpone to rise, the signal delay that electromagnetic sensor sends passes among the ECU, the top dead center that the ECU measuring meter is calculated along and barrel valve move that angle T reduces the fuel feeding time-delay between the signal of rising edge.Otherwise T is too little for fuel supply advance angle, and then ECU instructs high-speed electromagnetic valve C to close oil duct at once, and hyperbaric chamber 22 intermediate fuel oil pressure rise, and hydraulic pressure is pushing away piston 5, overcomes spring pressure and drives the direction rotation of roller base 3 to arrow 25 by pin 4.On the cam 8 protruding profile 7 and roller 6 contact corner in advance, plunger 16 and barrel valve 32 just rise in advance, the signal that the electromagnetism inductive pickup sends passes among the ECU in advance, top dead center that the ECU measuring meter is calculated along and barrel valve move that angle T strengthens between the signal of rising edge, fuel supply advance angle increases.Fuel feeding finishes pressure decline in the back-plunger chamber 17, and barrel valve 32 is taken a seat under spring 35 effects, waits for the next fuel feeding cycle.

Because the control of control unit ECU makes the oil pump advance angle be controlled at the optimum state according to the diesel engine operating condition, thereby can improve diesel powered performance and exhaust index always.

The thickness of pad 43 can be used for adjusting the pretightening force of cylindrical spring 35, the rate of climb and the time of control barrel valve 32, be used for adjusting the initial stage oil-supply speed of VE proportioning pump,, thereby reduce diesel engine noise and NOx discharging with the amount of fuel that sprays in the minimizing diesel engine delay period.The lift H of barrel valve 32 (fuel feeding pretravel) can adjust as requested.Oil pump whenever circles simultaneously, 4 times (4 cylinder diesel) of barrel valve 32 risings, but Input Control Element ECU is used for measuring the rotating speed of calculating diesel engine, plays the effect of multiple sensors.

Claims

1. directly survey the automatically controlled VE proportioning pump of advance angle with inductive pickup for one kind, it comprises VE proportioning pump, sensor, driving gear, high-speed electromagnetic valve, proportioning pump mounting plate, a TDCS TDC Sensor of directly surveying advance angle with inductance element of a band mechanical governor; It is characterized in that: the sensor of directly surveying advance angle with inductance element is installed in the front end that band mechanical governor VE proportioning pump distributes shell.

2. the automatically controlled VE proportioning pump of directly surveying advance angle with inductive pickup according to claim 1; it is characterized in that: the described sensor of directly surveying advance angle with inductance element comprises: sensor outer housing; be provided with barrel valve in the sensor outer housing; the cylinder valve seat; the cylinder valve gap; the spring seat of the one end band conical surface; spring; briquetting; protecting jacket; interior iron core; seal ring; inductance coil; core retainer plate; during oil pump feed; the barrel valve rising drives the conical surface on the spring seat; inner conical surface near iron core in the inductance coil; magnetic field in the coil is changed; to control unit ECU output electrical signal; when fuel feeding finishes, force spring seat and barrel valve reposition by spring force.

3. the automatically controlled VE proportioning pump of directly surveying advance angle with inductive pickup according to claim 2, it is characterized in that: described barrel valve and cylinder valve seat are a pair of precision pairs, gap 0.001-0.004 millimeter, barrel valve to-and-fro motion in cylinder valve seat and cylinder valve gap, the stroke 0.2-0.8 millimeter of barrel valve, the interior iron core cylindrical and the sensor inwall of inductance coil are provided with rubber seal.

4. according to claim 1ly directly survey the automatically controlled VE proportioning pump of advance angle with inductive pickup, it is characterized in that: described TDCS TDC Sensor is the Hall inductive pickup, is installed on the proportioning pump mounting plate, perhaps is installed on the diesel engine cylinder block.

5. according to claim 1ly directly survey the automatically controlled VE proportioning pump of advance angle, it is characterized in that with inductive pickup: on the driving gear, with the corresponding position of TDCS TDC Sensor Hall inductance element on be provided with a magnet steel.