CN205559083U - Can realize diesel engine throttle control system of stepless free speed governing - Google Patents

Abstract

The utility model relates to a can realize diesel engine throttle control system of stepless free speed governing, including speed sensor, programmable controller, electronic governor and throttle executor, the throttle executor is diesel engine's mechanical speed regulator, and its speed governing handle is located rated revolution position and rigid, and its oil -break solenoid valve is proportional solenoid valve, and electronic governor was located the zero -bit just when its shutdown handle was located the parking position. The utility model discloses a mode is stabilized to three kinds of operating modes of permanent rotational speed, constant pressure and constant current volume of diesel engine, has widened diesel engine's working range and operating condition.

Description

The Diesel engine throttle control system of stepless free speed governing can be realized

Technical field

The utility model relates to a kind of Diesel engine throttle control system.

Background technology

When outer load changes, the output moment of torsion of Diesel engine can change, and rotating speed the most correspondingly changes, and Diesel engine can be caused the situation that stall, vexed car and oil consumption increase occur.Therefore, the stability keeping rotary speed of diesel engine is very important.When operating mode changes, when needing change system working parameters, it is accomplished by changing its working speed, but the rotating speed of ordinary diesel oil engine sets before dispatching from the factory, rely on regulation accelerator open degree regulation rotary speed of diesel engine, there are three rated engine speeds, start idling, nominal operation rotating speed, maximum speed, its rotation speed change is great-jump-forward, intermediateness is unstable, impact to equipment is bigger, but this regulation process is unstable and cannot regulate rotation speed change accurately, other rotating speeds uncontrollable in addition to these three working speed, stepless speed regulation can not be realized.

Seeing Fig. 2, the original speed control principle of Diesel engine is to regulate the size of governor spring restoring force according to speed adjusting lever position difference and have different flyball centrifugal force to reach the principle realization control rotating speed of balance with it；When speed adjusting lever adds general orientation rotation toward governor spring pretightning force, tooth bar moves toward big oil mass direction, oil mass increases, rotating speed rises, and the centrifugal force of flyball increases therewith, when centrifugal force and governor spring tension balanced, rotary speed of diesel engine is stable at rotating speed of target, when governor spring pretightning force diminishes, rotary speed of diesel engine declines can be near rotating speed of target, centrifugal force and governor spring tension balanced；Thus reach the purpose of speed governing.

Fuel shut-off solenoid has two positions, adhesive and free state, when energized, electromagnetic actuation, electromagnet guide rod departs from shutdown handle, do not affect the work of speed regulator, when power is off, stretch out under electromagnet guide rod spring-force driven dual therein, act on shutdown handle, shifting shutdown handle onto parking spot, can make oil pump oil-break, Diesel engine shuts down.

Therefore, Diesel engine original regulation process is unstable and cannot regulate rotation speed change accurately, it is impossible to realize stepless speed regulation.

Utility model content

The utility model purpose is to provide a kind of Diesel engine throttle control system realizing stepless free speed governing, can realize the requirement of Diesel engine perseverance rotary speed working pattern.

Technical solution of the present utility model is:

A kind of Diesel engine throttle control system realizing stepless free speed governing, it is characterized in that, including speed probe, Programmable Logic Controller, electron speed regulator and throttle actuator；Described throttle actuator is the mechanical governor of Diesel engine, and, the speed adjusting lever of described mechanical governor is positioned at rated speed position and maintains static, the Fuel Cut Solenoid Valve of described mechanical governor is proportional solenoid valve, the shutdown handle of described mechanical governor when being positioned at parking spot described electron speed regulator be located exactly at zero-bit；Described speed probe gathers tach signal from Diesel engine and sends into Programmable Logic Controller；Described Programmable Logic Controller regulates signal according to tach signal output speed；Rotary speed regulating signal is converted into the current signal proportional to rotary speed regulating signal and sends into the proportional solenoid valve of throttle actuator by described electron speed regulator.

Above-mentioned Programmable Logic Controller can regulate signal according to tach signal by pid control algorithm output speed；

Described pid control algorithm expression formula is:

$MV=K_P*E\left(t\right)+K_I*E\left(t\right)\frac{1}{S}+K_D*PV\left(t\right)S$

In formula: MV is output valve；K_PIt it is proportional gain；E (t) is deviation value；PV is measured value；SV is desired value；K_DIt it is the differential gain；PV (t) S is the differential value of PV (t)；K_IIt it is storage gain；It it is the integrated value of E (t).

Advantage of the present utility model:

The utility model can realize the Diesel engine throttle control system of stepless free speed governing and have employed E-Gas drive mechanism, owing to drive mechanism is by signal of telecommunication control, control signal can be inputted by manual knob or touch-screen speed setting two ways, the control signal of input makes drive mechanism move, Diesel engine throttle aperture is changed, thus control rotary speed of diesel engine by controlling diesel engine fuel-firing conveying fuel-flow control, can between idling and maximum speed step-less adjustment, constant pressure oil supply can be realized.In order to enable Diesel engine in any rotating speed stable operation, the electron speed regulator of the utility model control system is inner ring control, and inner ring controls to be divided into again current regulator and rotating speed to control ring, can make stabilization of speed in the range of one rotating speed coarse adjustment；Vehicle Controller is outer shroud control, can make stabilization of speed in setting value rotating speed fine tuning.Therefore, no matter load under each operating mode and how to change, the invariablenes turning speed of Diesel engine can be ensured, can make Diesel engine stable operation on any one rotating speed point of 1100～3600 revs/min, thus achieve the rotating speed of Diesel engine accurately, stable, continuous print function of stepless speed regulation, solve the change of rotary speed of diesel engine great-jump-forward, intermediateness unstable, the problem bigger to equipment impact.

Accompanying drawing explanation

Fig. 1 is that the diesel engine application that is suitable for of the utility model is in the structural representation of centrifugal pump；

Fig. 2 is existing Diesel engine machinery formula throttle control system structural representation；

Fig. 3 is the utility model throttle control system structural representation；

Fig. 4 is the stepless electronic governing system theory diagram of the utility model throttle control system；

Fig. 5 is the revolution speed control system schematic diagram of the utility model throttle control system；

Fig. 6 is the control system flow chart of the utility model throttle control system.

Wherein: 1-self-priming centrifugal pump, 100-water inlet, 101-housing, 102-inducer, 103-locking nut, 104-impeller, 105-mechanical seal, 106-main shaft, 107-bracket, 108-S type water inlet bend, 109-fluid return ports, 110-fluid reservoir, 111-delivery port, 112-gas-liquid separation chamber, 2-Diesel engine, 20-mechanical governor, 22-oil pump, 201-speed adjusting lever, 202-oil-break electromagnet, 203-flyball, 204-sliding sleeve, 205-shutdown handle, 206-governor spring, 207-boosting-rod, 208-parking spot, 209-tooth bar, 4-unsplit bedplate.

Specific implementation method

As it is shown in figure 1, the housing 101 of the Diesel engine that is suitable for of the utility model centrifugal pump used joined together is built with inducer 102, impeller 104, mechanical seal 105；Fluid passes sequentially through inducer 102, impeller 104 by the water inlet 100 of housing 101 after being entered, then is flowed out by the delivery port 111 of housing；Inducer 102 and impeller 104 pass through key transmission with main shaft；One end of main shaft 106 is power intake, is held tightly on diesel engine machine crankshaft by extending shaft structure attachment screw；The main shaft other end is fixed be connected with inducer 102, impeller 104, mechanical seal 105 successively, and inducer is positioned at the front end of impeller.The end of the main shaft other end is provided with spindle nose locking nut 103, and spindle nose locking nut is for carrying out axial restraint to inducer and impeller.During installation, impeller location is in the outlet passage of housing, and its effect is to have pressure to go out by housing runner in the medium through impeller effect；Inducer position, in housing S type water inlet bend pipe, can allow medium just be acted on through inducer before by impeller effect, improve anti-cavitation performance.Reveal in view of medium, after main shaft is positioned at impeller, mechanical seal is installed.It is fixed together with bracket between housing and Diesel engine, it is ensured that the run stability of unit.

As it is shown on figure 3, the shutdown handle 205 of mechanical governor 20 is pulled parking spot 208, it is connected with the zero-bit of electron speed regulator in this position.Speed adjusting lever 201 should pull rated speed position, and is fixed up.After connection, it is ensured that connecting rod motion is flexibly, fixing reliable.Original Fuel Cut Solenoid Valve is replaced again with proportion electro-magnet.The function of proportion electro-magnet is the signal of telecommunication converting to force or displacement Proportional Amplifer exported.Proportion electro-magnet thrust is big, and simple in construction, less demanding to oil cleanliness, easy to maintenance, low cost, armature chamber can make high pressure resistant structure, is wide variety of electromechanical converter part in electrical-liquid control element.

Control system 3 includes Programmable Logic Controller, touch-screen, Diesel engine electron speed regulator, throttle actuator, 1# speed probe, 2# speed probe.The control system 3 being made up of storage battery, Diesel engine, actuator, electron speed regulator, Programmable Logic Controller, touch-screen, pump group, various sensor and control circuit shown in Fig. 4.

Programmable Logic Controller, touch-screen and Diesel engine electron speed regulator are arranged in control system.Throttle actuator, 1# speed probe and 2# speed probe are arranged on Diesel engine.

The major function of throttle actuator is that the position signalling that rotational speed governor exports is converted into the straight-line displacement position specified to control fuel supply volume.The input of throttle actuator is the signal of telecommunication, and output is machinery linear motion.Machinery moves along a straight line and is entered as proportionate relationship.Throttle actuator has the features such as control performance is excellent, volume is little, reliability is high and installs, good seal performance with oil pump integral type, can improve the speed governing index of Diesel engine and realize Automated condtrol and the protection of Diesel engine.Throttle actuator tip designs has manual regulating device, is in particular cases capable of manually regulating the function of fuel delivery.

Utility model works principle:

Rotary speed of diesel engine control system principle is as shown in Figure 5, speed probe gathers tach signal from Diesel engine, it is converted into square-wave signal through corresponding change-over circuit, rotating speed PV is calculated by measuring umber of pulse, send into Programmable Logic Controller, when measured value PV is unequal with target set point SV, produce deviation signal E (t)=SV-PV, pid control algorithm preset in this controller carries out computing to deviation signal, and export corresponding regulation signal MV, regulation signal drives throttle actuator to export the current signal proportional to regulation signal through electron speed regulator, the rotating speed of regulation Diesel engine, deviation is made to level off to zero, Diesel engine is allowed to keep constant-speed operation.

When external load increases suddenly, system controls throttle actuator and increases aperture, to avoid diesel oil rotating speed to reduce suddenly even flame-out phenomenon；When external load reduces suddenly, system controls throttle actuator and reduces aperture, to avoid rotary speed of diesel engine to raise suddenly the phenomenon of even driving.

Pid control algorithm basic representation is:

$MV=K_P*E\left(t\right)+K_I*E\left(t\right)\frac{1}{S}+K_D*PV\left(t\right)S$

In formula: MV is output valve；K_PIt it is proportional gain；E (t) is deviation value；PV is measured value；SV is desired value；K_DIt it is the differential gain；PV (t) S is the differential value of PV (t)；K_IIt it is storage gain；It it is the integrated value of E (t).

When the utility model diesel engine application is in centrifugal pump, a nominal operation rotating speed of centrifugal pump, to should one group of rated operating pressure of centrifugal pump and flow.Can be on the basis of this control program, by pressure sensor (inlet pressure transmitter, outlet pressure transmitter, 1# filtering outlet pressure transmitter, 2# filtering outlet pressure transmitter) and the feedback signal of flow sensor (1# flowmeter and 2# flowmeter), it is achieved Isobarically Control and constant flux control.The flow chart of this control system is as shown in Figure 6.

Claims (1)

1. the Diesel engine throttle control system that can realize stepless free speed governing, it is characterised in that: include speed probe, Programmable Logic Controller, electron speed regulator and throttle actuator；Described throttle actuator is the mechanical governor (20) of Diesel engine, and, the speed adjusting lever (201) of described mechanical governor (20) is positioned at rated speed position and maintains static, the Fuel Cut Solenoid Valve (202) of described mechanical governor (20) is proportional solenoid valve, and when the shutdown handle (205) of described mechanical governor (20) is positioned at parking spot (208), described electron speed regulator is located exactly at zero-bit；Described speed probe gathers tach signal from Diesel engine and sends into Programmable Logic Controller；Described Programmable Logic Controller regulates signal according to tach signal output speed；Rotary speed regulating signal is converted into the current signal proportional to rotary speed regulating signal and sends into the proportional solenoid valve of throttle actuator by described electron speed regulator.