CN201396229Y - Electric control VE dispensing pump directly measuring advance angle by Hall transducer - Google Patents

Abstract

The utility model relates to an electric control VE dispensing pump directly measuring advance angle by Hall transducer, which comprises a VE dispensing pump with a mechanical speed regulator and an Hall advance angle transducer, wherein the Hall advance angle transducer is installed on the front end of a dispensing outer shell of the VE dispensing pump, and directly measures the oil supplying starting time of the VE pump. The VE dispensing pump increases the cam lift of the VE dispensing pump and improves the oil supplying pressure in one aspect, and accurately controls the oil supplying advance angle through using the electric control technology in the other aspect, adopts an existing mechanical speed regulator to control the oil supplying quantity, enables the discharge of a diesel engine to reach the EU 3 standard through matching with an EGR, and has simple structure, low cost and convenient maintaining.

Description

Directly survey the automatically controlled VE proportioning pump of advance angle with Hall transducer

Technical field

The utility model relates to a kind of automatically controlled VE proportioning pump with direct measurement of Hall transducer and control fuel supply advance angle with mechanical governor control fuel delivery.

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 transducer simple in structure, cheap, easy to maintenance.

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

In order to measure the commencement of fuel supply, the utility model distributes the shell front portion at the VE proportioning pump, and the barrel valve of a precision directly is installed, and an end of barrel valve communicates with the proportioning pump plunger cavity, and the other end is equipped with the Hall 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 sensor, 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 advancing device piston stroke in the high-speed electromagnetic valve control proportioning pump, 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.The Z axle is the cam rotation direction among the figure, and K is the top dead center signal.Cam of injection pump whenever circles and produces a fixed signal relatively, P1 is the barrel valve motor message, the cam of injection pump axle whenever circles, produce four signals (four cylinder oil pumps), changing then as advance angle, signal changes to P2 from P1, as long as angle T between the barrel valve motion rising edge just can calculate and definite fuel supply advance angle when measuring top dead center signal rising edge and certain oil supply cylinder.

The utility model increases VE proportioning pump cam lift on the one hand, improve charge oil pressure, control 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.

The automatically controlled VE proportioning pump of the utility model directly being surveyed fuel supply advance angle with Hall transducer below in conjunction with accompanying drawing is further described.

Description of drawings:

Fig. 1 is 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 band mechanical governor of the present utility model.

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

A is that advance angle sensor, C are that high-speed electromagnetic valve, D are that TDCS TDC Sensor, K are that top dead center signal, P1 are that barrel valve motor message, T are that fuel supply advance angle, Z are the cam rotation direction for VE proportioning pump, the B of 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 driving gears; 29 magnet steel; 30 cylinder valve seats; 31 sensor overcoats; 32 barrel valves; 33 cylinder valve gaps; 34 spring seats; 35 springs; 36 riveting points; 37 briquettings; 38 protecting jackets; 39 Hall elements; 40 stuffing box glands; 41 seal rings; 42 magnet steel; 43 pads; 44 clues; 45 blind holes; 46 blind hole wall thickness; 47 Hall elements; 48 sensor outer housings; 49 setting sleeves; 50 screws; 51 clues.

Specific implementation method:

As shown in Figure 2, at distribution shell 18 front ends of mechanical speed governors VE proportioning pump A, Hall advance angle sensor B is installed; Advancing device piston 5 and high-speed electromagnetic valve C are equipped with in the oil pump bottom; TDCS TDC Sensor D is installed on oil pump mounting plate 28.

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 Hall advance angle sensor B, TDCS TDC Sensor D, directly controls 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 Hall element is housed.Hall element 47 is installed in the sensor outer housing 48, and is fixed on the proportioning pump mounting plate 27 with setting sleeve 49 and screw 50.Appropriate location on the driving gear 28 is equipped with a powerful magnet steel 29.When driving gear 28 rotates, can pass through clue 51 to control unit ECU output pulse signal during magnet steel 29 process Hall elements 47, 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, 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, lid 33 and distributes on the highi degree of accuracy end faces 19 in the sleeve.Barrel valve and cylinder valve seat are a pair of precision pairs, gap 0.001-0.004 millimeter, and 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 equipped with powerful magnet steel 42, leaves approximately 2-6mm of Hall element 39 distances.Sensor outer housing 31 right-hand members are provided with seal ring 41, the stuffing box gland 40 that also useful nonmagnetic substance such as aluminium, brass, magnetism-free stainless steel, plastics etc. are made.Hall element 39 is fixed in the blind hole 45 of stuffing box gland 40, and blind hole 45 is blind holes, and the thick 0.5-1 millimeter of hole wall is to guarantee sealing.Stuffing box gland 40 back are equipped with compact heap 37, in the riveted joint of end face 36 places of sensor outer housing 31 stuffing box gland 40 are compressed.

When driving gear 28 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 (stroke about 0.2～0.5mm) till pushing up cylinder valve gap 33.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 rises, be contained in powerful magnet steel 42 on the spring seat 34 rapidly near Hall element 39, make magnetic field in the Hall element 39 generation current signal that changes, after amplifying, be transferred to and carry out signal processing among the control unit ECU by clue 44.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 Hall element 39 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 contact corner in advance, plunger 16 and barrel valve 32 just rise in advance, the signal that Hall transducer 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 31 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 (5)

1, a kind ofly directly survey the automatically controlled VE proportioning pump of advance angle with Hall transducer, it comprises VE proportioning pump, sensor, oil pump driving gear, high-speed electromagnetic valve, proportioning pump mounting plate, a TDCS TDC Sensor of directly surveying advance angle with Hall element of a band mechanical governor; It is characterized in that: the sensor of directly surveying advance angle with Hall 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 Hall transducer according to claim 1; it is characterized in that: the described sensor of directly surveying advance angle with Hall element comprises: be provided with barrel valve, cylinder valve seat, cylinder valve gap, spring seat, spring, briquetting, protecting jacket, Hall element, stuffing box gland, magnet steel in sensor outer housing, the sensor outer housing; during oil pump feed; the barrel valve rising drives magnet steel and exports electrical signal near Hall element to control unit ECU; when fuel feeding finishes, force magnet steel and barrel valve reposition by spring force.

3, the automatically controlled VE proportioning pump of directly surveying advance angle with Hall transducer according to claim 2, it is characterized in that: barrel valve and garden column valve seat are a pair of precision pairs in the Hall advance angle sensor, gap 0.001-0.004 millimeter, barrel valve to-and-fro motion in garden column valve seat and cylinder valve gap, the stroke 0.2-0.5 millimeter of garden column valve, Hall element is contained in the thin-walled blind hole stuffing box gland made from nonmagnetic substance, and stuffing box gland cylindrical and sensor inwall are provided with rubber seal.

4, according to claim 1ly directly survey the automatically controlled VE proportioning pump of advance angle with Hall transducer, it is characterized in that: described TDCS TDC Sensor is a Hall transducer, is installed on the proportioning pump mounting plate, or 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 Hall transducer: on the driving gear, with the corresponding position of TDCS TDC Sensor Hall element on be provided with a magnet steel.

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