CN1904334A - Fuel jetting device - Google Patents

Abstract

The fuel injection device comprises a fuel injection module for sucking fuel with the reciprocating motion of a plunger and injecting it with pressure, and a control unit for giving a drive signal to the fuel injection module. The control unit determines whether the operating condition of the engine E is in a before-start control mode, an idling control mode, or the fuel cut control mode and gives the drive signal to the fuel injection module in each control mode to avoid the event of fuel injection. A time for energizing the drive signal is changed over corresponding to each control mode.

Description

Fuel injection system

Technical field

The present invention relates to a kind ofly have the to-and-fro motion that utilizes plunger and come to fuel attract, the pressurize fuel injection system of the fuel injection unit that the back sprays, relate in particular to and under the various operating conditions of engine, can make fuel spray regime maintenance stabilization, prevent the technology that defective mode takes place.

Background technique

Thereby as the electronic controlled fuel injection apparatus that comes the delivery volume of computing fuel to carry out fuel supply according to the rotating speed of engine and load, a kind of fuel injection unit had been proposed in the past, its drive signal of sending according to control unit is to electromagnet coil power, the electromagnetic force of electromagnet coil generation is moved plunger thus, thereby to fuel pressurization and be injected in the engine, then, when being pushed back by spring, plunger can attract next time fuel (for example with reference to patent documentation 1).

In addition, in this fuel injection unit, electromagnet coil heating that produces during higher or Electromagnetic Drive plunger because of ambient temperature etc., cause in the cylinder body that plunger moves back and forth, being detained the fuel (hereinafter referred to as steam) that is mixed with bubble, the ratio of mixture of burner oil is descended, cause the defective mode of engine.Therefore, for anti-phenomenon here, be provided with before fuel sprays, make the steam that is detained in the cylinder body in advance via the steam output mechanism of recurrent canal to the fuel tank backflow.

Adopt the fuel injection system of the fuel injection unit of this structure, compare from the device of sparger ejection with pressure regulation and with pressurized fuel with fuel being pressurizeed with petrolift and regulator, has the less advantage of component parts, in addition, because only energising when spraying is so have the less advantage of mean consumption electric power.Therefore, be particularly useful for the lower small-sized two-wheel car of generator and storage battery ability.

And, when be in idling conditions, when the fuel of burner oil does not block control mode or stop but in this fuel of the state of electric power starting when easy vaporific state or high temperature halted state, between a drive signal and next drive signal, be not enough to the pulse electrifying of burner oil sometimes.Fig. 8 is the drive signal of expression under the idling conditions and the ideograph of the action of fuel injection unit, from Fig. 8 (b) as can be known, make the pulse electrifying (spraying current"on"time) that between a drive signal and next drive signal, is not enough to burner oil to the drive signal of electromagnet coil power hereinafter referred to as removing injection or removing, thereby suppress the generation of steam, shown in Fig. 8 (d), the jetting stability of fuel is described, especially restarting property raising (for example with reference to patent documentation 2).

In addition, a kind of technology was also proposed in having the fuel injection system of this fuel injection unit in the past, after its drive plunger is carried out the fuel injection, be returned that spring pushes back and when attracting fuel at plunger, the electric power that electromagnet coil is saved temporarily is stored in electric power storage in the driving loop that is arranged at electromagnet coil with in the capacitor.And, when DM coil once again, the electric power storage electric power in the capacitor is emitted, with the driving force of this electric power, thereby improve the responsiveness (for example with reference to patent documentation 3) of electromagnet coil as electromagnet coil.

[patent documentation 1] Japan Patent spy opens the 2001-221137 communique

[patent documentation 2] Japan Patent spy opens the 2003-227432 communique

[patent documentation 3] Japan Patent spy opens the 2003-336537 communique

Fig. 9 is illustrated under the different control modes and makes fuel injection unit begin the minimum current"on"time of burner oil accordingly with supply voltage, Air suction pipe pressure.As shown in this figure, change with each supply voltage, each Air suction pipe pressure the minimum current"on"time that fuel injection unit begins burner oil, therefore, the pulse charging time that is not enough to burner oil that electromagnet coil is implemented not respectively the different control mode of corresponding power voltage, Air suction pipe pressure (during the prestart control mode, during the idle running control mode, when fuel blocks control mode) switch.

For example, closing throttle valve when making engine deceleration or when travelling downhill path and the rotation of engine hypervelocity, need not engine is carried out fuel supply, therefore, control unit converts the fuel that stops to the engine fueling to and blocks control mode according to the detection output of deceleration sensor and crank angle sensor, yet, in the past when being converted to this fuel and blocking control mode, control unit can be judged as and fuel sprayed move with plunger, thereby the energising of electromagnet coil is stopped fully.

Yet being converted under the state that this fuel blocks control mode, even need not to the engine fueling, but because the ambient temperature height also may produce a large amount of steams in the cylinder body that plunger moves back and forth.Yet in the prior art, even under this vaporific situation, also therefore the drive plunger not because control unit stops the energising of electromagnet coil fully becomes the state that can't remove steam.

That is to say, all the time all as patent documentation 2, at engine when the high temperature halted state begins to restart, in the short time of burner oil electromagnet coil is switched on being not enough to, thereby discharge steam effectively, yet under fuel blocks control mode, stop fully, do not relate to the countermeasure of any effective discharge steam to the energising of electromagnet coil.

Therefore, block control mode at fuel and remove the back and begin fuel once more when spraying, have a large amount of steams to be mixed in the fueling, consequently cause continuing, make the engine outofkilter less than the fuel spray regime of target proportions of ingredients.In addition, when fuel for example higher at supply voltage, that Air suction pipe pressure is lower blocks control mode, there is a spot of fuel to ooze out from fuel injection unit, these fuel are in the cylinder body internal combustion or do not burn, the defective mode that causes engine, the fuel of not burning at the cylinder body internal combustion arrives the baffler that is positioned at the engine downstream in addition, is accumulating a certain amount of just may blast when above (afterburning).

And, under fuel blocks control mode, stop fully to the energising of electromagnet coil and can't drive plunger, therefore, as described in patent documentation 3, even in the driving loop of electromagnet coil, be provided with the electric power storage capacitor, also can't carry out electric power storage with capacitor, therefore to this electric power storage, block that control mode is removed the back and once more during the DM coil at fuel, can not get electric power storage and supply with, therefore, can't improve the responsiveness of electromagnet coil with the electric power of capacitor.Therefore, can become the fuel spray regime that is lower than target fuel, cause the defective mode of engine.

Summary of the invention

For addressing the above problem, the object of the present invention is to provide a kind of under the various operating conditions of engine total energy keep stable fuel spray regime, can effectively prevent the fuel injection system of the malrotation of engine.

To achieve these goals, fuel injection system of the present invention comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And the control unit that described fuel injection unit is sent the drive signal that plunger actuation uses according to the engine running state, whether described control unit is in fuel according to the engine running condition judgement is blocked control mode, being judged to be when being in fuel and blocking control mode, described fuel injection unit is sent drive signal with the short time that is not enough to burner oil.

In addition, fuel injection system of the present invention comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And the control unit that described fuel injection unit is sent drive signal, described control unit judge the engine running state be the engine pre-start state be prestart control mode, idling conditions promptly dally control mode, or fuel to block state be that fuel blocks control mode, when being described each control mode, described fuel injection unit is sent described drive signal and makes it be not enough to burner oil, and corresponding described each control mode is to switching the current"on"time of described drive signal.

And fuel injection system of the present invention comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And control unit, this control unit has according to the engine running condition judgement and goes out the mode decision member that the engine pre-start state is the prestart control mode, and when being the prestart control mode, described fuel injection unit is sent the drive signal of the pulse amplitude that is not enough to burner oil, according to the detected throttle valve opening state of described control unit, do not make described fuel injection unit start required fuel and spray, and after described fuel injection unit continued to be not enough to the pulsed drive of burner oil or prevents the engine starting rapidly.

If use the present invention, be not only at engine when the high temperature halted state is restarted and engine when being in idling conditions, even when being converted to fuel and blocking control mode, also can switch on electromagnet coil, do not spray even therefore do not carry out fuel, can make plunger actuation yet.Therefore, when plunger is activated, the steam in the cylinder body efficiently can be discharged, and, therefore can suppress the generation of steam because the fuel flow rate increase that refluxes improves cooling action.

Fuel injection system of the present invention, also corresponding control mode (during the prestart control mode, idle running during control mode, when fuel blocks control mode) is switched the pulse charging time of the drive signal that electromagnet coil is sent, especially when fuel blocks control mode, because the pulse charging time during than the idle running control mode is short, therefore can reliably block fuel, and the steam that produces can be discharged to return path reliably, also can prevent afterburning simultaneously.

In addition, block under the control mode also can make plunger actuation at fuel, therefore can carry out electric power storage with capacitor, so once again electromagnet coil is switched on during drive plunger electric power storage, can obtain energy with capacitor from electric power storage, thereby improve the responsiveness of electromagnet coil.

Therefore, under the various operating conditions of engine, can carry out suitable fuel and spray, keep stable fuel spray regime, can effectively prevent running at high speed after the bad or engine starting of engine.

Description of drawings

Fig. 1 is among the expression embodiment 1, fuel injection system of the present invention is installed on the summary construction diagram of the state of engine.

Fig. 2 is the general profile chart that expression constitutes the fuel injection unit of fuel injection system.

Fig. 3 is used for the drive signal of control unit output and time diagram that the action of fuel injection unit that should drive signal is described.

Fig. 4 is when representing to travel usually, the explanatory drawing of the relation of engine speed and throttle valve opening when when giving it the gun, Reduced Speed Now.

Fig. 5 is used for fuel is blocked the time diagram that the action of control unit under the control mode and fuel injection unit describes.

Fig. 6 is the flow chart that control action is sprayed in the removing among the expression embodiment 2.

Fig. 7 is the ideograph of drive signal, action and the IGNITION CONTROL of fuel injection unit under engine starting illegal state among the expression embodiment 3.

Fig. 8 is the drive signal of expression prior art under idling conditions and the ideograph of the action of fuel injection unit.

Fig. 9 is when being illustrated in different control mode, the fuel injection unit that makes under each supply voltage, each Air suction pipe pressure begins the chart of the minimum current"on"time of burner oil.

Embodiment

Embodiment 1

Fig. 1 is in the expression present embodiment 1, fuel injection system of the present invention is installed on the summary construction diagram of the state of engine.

Among Fig. 1, symbol 1 is represented four circular form engines, the inhalation temperature sensor of the temperature of the suction air of 2 representative detection engines 1,3 represent throttle valve, 4 representatives detect the throttle valve opening sensor of throttle valve 3 apertures, the pressure of inspiration(Pi) sensor of the pressure of the suction air in 5 representative detection throttle valve, 3 downstream sides, 6 representatives detect the engine temperature sensor of engine 1 wall surface temperature, 7 representatives are used to detect the crank angle sensor of rotational position of the not shown crankshaft of engine 1,8 represent fuel injection unit, 9 representative point fire coils, 10 represent control unit.

And above-mentioned fuel injection unit 8 is injected into fuel in the induction mnifold 15 that is connected with engine 1.In addition, control unit 10 calculates suitable fuel between injection period, fuel injection amount according to the detection of each sensor 2～7 output, and exports drive signal to fuel injection unit 8, simultaneously fire signal is exported to spark coil 9.

In addition, 11 represent fuel tank, 12 supplying pipes of representing fuel supply to use, and 13 representatives are arranged at the filter in this supplying pipe 12 ways, and the steam that 14 representatives are used to fuel injection unit 8 is produced is back to the recurrent canal of fuel tank 11.

And in the present embodiment 1, fuel injection system is by fuel injection unit 8, control unit 10, fuel tank 11 and respectively manage 12,14 and constitute.

Fig. 2 is the general profile chart that expression constitutes the above-mentioned fuel injection unit 8 of fuel injection system.

Among Fig. 2,81 represent plunger, and 82 represent cylinder body, and 83 represent electromagnet coil, on behalf of fuel, 84 spray check nozzle, and 85 represent throttle nozzle, and 86 represent fuel injection orifice, on behalf of fuel, 87 suck check nozzle, and check nozzle is returned in 88 representatives, and 89 represent return path.

And, according to the drive signal that control unit 10 is sent electromagnet coil 83 is switched on.In addition, fuel sucks check nozzle 87 and is communicated with supplying pipe 12, and in addition, one of return path 89 distolaterally is communicated with the part of cylinder body 82 sidewalls by returning check nozzle 88, and another is distolateral to be communicated with recurrent canal 14.

Action to the fuel injection unit 8 that adopts structure shown in Figure 2 describes with reference to time diagram shown in Figure 3.

After the drive signal that is sent according to control unit 10 began electromagnet coil 83 switched on, the electromagnetic force that electromagnet coil 83 is produced made plunger 81 move to Fig. 2 below.At this moment, plunger 81 arrive be located at cylinder body 82 sidewalls return before the check nozzle 88 during, the steam in the cylinder body 82 from constitute the steam output mechanism return check nozzle 88 and return path 89 is back to fuel tank 11 via recurrent canal 14.

And when the drive signal that is sent according to control unit 10 continued electromagnet coil 83 switched on, plunger 81 continued to move downwards, blocks return path 89 with its side, therefore when stopping steam and discharging, cylinder body 82 interior fuel was pressurizeed.

At this, the steams in the above-mentioned cylinder body 82 be discharged to the outside, then the fuel in the cylinder body 82 pressurized during T1 become between invalid injection period.And, if plunger 81 is moved further the pressure overshoot value that makes in the cylinder body 82, then sprays check nozzle 84, throttle nozzle 85, fuel injection orifice 86 by fuel and be injected into induction mnifold 15 (among Fig. 3 during T2) through the fuel of pressurization.

T0 between the period of output of the drive signal that is sent through control unit 10, the energising of electromagnet coil 83 is stopped after, get back to original position (among Fig. 3 during T3) thereby not shown return spring is moved upward plunger 81.At this moment, the fuel of supplying with via supplying pipe 12 from fuel tank 11 is attracted in the cylinder body 82 by fuel suction check nozzle 87.

At this, the relation of engine speed and throttle valve opening when Fig. 4 represents to travel usually, when when giving it the gun, Reduced Speed Now.Among Fig. 4, when the detected throttle valve 3 aperture basically identicals of crank angle sensor 7 detected engine speeds and throttle valve opening sensor 4, control unit 10 is judged to be when travelling usually.In addition, during greater than pairing throttle valve 3 apertures of crank angle sensor 7 detected current engine rotating speeds, control unit 10 is judged to be when giving it the gun in throttle valve opening sensor 4 detected throttle valve 3 apertures.

When the travelling usually of this vehicle and when giving it the gun, T0 determines according to following method between the period of output of the drive signal that 10 pairs of fuel injection units of control unit 8 send.At first, corresponding each sensor 2,4～6 detects atmospheric temperature, inhalation temperature, engine temperature and the throttle valve opening of output, the basic injection period that determines basic emitted dose is carried out revisal, decision discharge time T2, add then between above-mentioned invalid injection period T1 obtain T0 between period of output (=T1+T2).In addition, in this case, detected throttle valve 3 apertures of lower and throttle valve opening sensor 4 are big and when being in acceleration mode, T0 can prolong between the period of output of the drive signal that control unit 10 is exported in the temperature of the detected engine 1 of the detected inhalation temperature of inhalation temperature sensor 2 and engine temperature sensor 6.

And control unit 10 is according to the detection of crank angle sensor 7 output, with the rotation of the crankshaft of engine 1 synchronously to fuel injection unit 8 output drive signals.That is to say that in the present embodiment 1, because engine is four circular forms, therefore, crankshaft rotates and has the drive signal that 1 output is set in T0 between above-mentioned period of output in 2 times.

On the other hand, as shown in Figure 4, in throttle valve opening sensor 4 detected throttle valve 3 apertures during less than pairing throttle valve 3 apertures of crank angle sensor 7 detected current engine rotating speeds, when control unit 10 is judged to be Reduced Speed Now.In addition, when crank angle sensor 7 detected current engine rotating speeds exceed predefined dangerous values, be judged to be the situation of the engine 1 hypervelocity rotation that descent run etc. causes.

When control unit 10 is judged to be above-mentioned Reduced Speed Now state or engine hypervelocity rotation status, converts fuel to and block control mode.And, block under the control mode at this fuel, control unit 10 is according to the detection of crank angle sensor 7 output, and the rotation of the crankshaft of engine 1 synchronously with than T1 between invalid injection period short slightly during to fuel injection unit 8 output drive signals.

Fig. 5 is used for fuel is blocked the time diagram that the action of control unit under the control mode and fuel injection unit describes.As shown in Figure 5, control unit 10 is according to the detection of crank angle sensor 7 output (with reference to Fig. 5 (A)), in crankshaft rotation 2 times, have 1 time with T1 between than invalid injection period short slightly during output drive signal (with reference to Fig. 5 (B)).Therefore, do not spray (with reference to Fig. 5 (D)) though do not carry out fuel, but electromagnet coil 83 is switched at short notice, plunger 81 moves (with reference to Fig. 5 (C)) at short notice, therefore, the steam in the cylinder body 82 from constitute the steam output mechanism return check nozzle 88 and return path 89 is back to fuel tank 11 via recurrent canal 14.At this moment, cooling action can be improved, the generation of steam can be suppressed again.

In addition, block under the control mode at this fuel, though very short plunger 81 of time be activated, therefore can be with electrical power storage in electric power storage with in the capacitor.Therefore,, can obtain energy with capacitor from electric power storage, thereby improve the responsiveness of electromagnet coil 83 during drive plunger 81 electromagnet coil 83 energising once again.

In addition, at this, under fuel blocks control mode, in crankshaft rotation 2 times, have 1 time with T1 between than invalid injection period short slightly during output drive signal, yet at engine 1 rotating speed hour, in order to improve the discharge efficient of steam, also can be when the every rotation of crankshaft one time output drive signal.

In addition, at engine 1 when the high temperature halted state is restarted and engine 1 when being in idling conditions, with identical in the past, control unit 10 only in plunger 81 deficiencies so that the short time that fuel sprays output drive signal in (between T1 short slightly during) promptly than invalid injection period, make steam discharge efficiently via return path 89.Therefore, can improve the restarting property etc. of engine 1.

Like this, in the present embodiment 1, under the various operating conditions of engine 1, can keep stable fuel spray regime, therefore can carry out suitable fuel and spray, thereby prevent that effectively engine 1 from producing defective mode.

In addition, in the foregoing description 1, the situation of carrying out the fuel injection with four circular form engines 1 is that example is illustrated, yet the present invention is not limited thereto, and undoubtedly the present invention is equally applicable to the situation that two circular form engines carry out the fuel injection.

Embodiment 2

In the foregoing description 1, illustrated under fuel blocks control mode, and the rotation of the crankshaft of engine 1 synchronously between than invalid injection period T1 short slightly during in to the situation of fuel injection unit 8 output drive signals, yet among the embodiment 2, the operating condition of judging engine is that the engine pre-start state is the prestart control mode, the idling conditions control mode that promptly dallies, or it is that fuel blocks control mode that fuel blocks state, and when being above-mentioned each control mode, above-mentioned fuel injection unit is sent above-mentioned drive signal and makes it be not enough to burner oil, and with above-mentioned each control mode accordingly to switching the current"on"time of above-mentioned drive signal.

Next, utilize the flow chart of Fig. 6 that above-mentioned removing injection control action is described.At first, in step S101, will remove to spray and be set at 0 current"on"time, enter step S102.In step S102, judge whether to be in the prestart control mode according to engine status.

When being judged to be the prestart control mode, enter step S103, will remove to spray and be set at XTPRGSTA current"on"time.In step S102, be judged to be when not being the prestart control mode, enter step S104, judge whether to be in the idle running control mode according to engine status.

Being judged to be idle running during control mode, enter step S105, will remove injection and be set at XTPRGIDL current"on"time.In addition, in step S104, be judged to be when not being the idle running control mode, enter step S106, judge whether to be in fuel according to engine status and block control mode.

Being judged to be fuel when blocking control mode, enter step S107, will remove to spray and be set at XTPRGFC current"on"time.At this, be not that prestart control mode, idle running control mode, fuel block in the control mode when any being judged to be, with remove spray remain current"on"time set among the step S101 0.After finishing every processing, enter step S108, corresponding removing is sprayed and is implemented current"on"time to remove to spray, and finishes this program.

It is that the short value of XTPRGIDL current"on"time is sprayed in removing during than the idle running control mode that current"on"time XTPRGFC is sprayed in removing when in addition, above-mentioned fuel blocks control mode.

Because embodiment 2 adopts structure as indicated above, therefore can corresponding various control modes (during the prestart control mode, during the idle running control mode, when fuel blocks control mode) switch the pulse charging time that is not enough to burner oil (remove and spray current"on"time) that electromagnet coil is sent, especially when fuel blocks control mode, because it is short during pulse charging time ratio idle running control mode, therefore can reliably block fuel, and the steam that produces discharged to return path reliably, can when preventing the engine defective mode, prevent afterburning.

Embodiment 3

The ideograph of the action that Fig. 7 is the fuel injection unit of expression among the embodiment 3 when the engine halted state begins to utilize engine starting arrangement starting engine, (A) be the figure of expression power supply open and close state, (B) be the figure of the output signal of expression crank angle sensor 7, (C) be the figure of the situation of expression throttle valve opening, (D) be the driving pulse that is additional to the electromagnet coil of fuel injection unit 8, (E) be the electric current of electromagnet coil, (F) being that expression fuel sprays the figure of situation, (G) is the figure of expression fire signal.

Shown in Fig. 7 (A), after opening the power supply of fuel injection system, shown in Fig. 7 (D), drive signal (pulse) that will be corresponding with invalid discharge time with predetermined distance is sent to fuel injection unit 8, shown in Fig. 7 (E), electromagnet coil is switched on, drive plunger 81 is utilized aforementioned steam output mechanism that the steam in the fuel injection unit 8 is forced to spue to fuel injection unit, and not shown electric power storage is carried out electric power storage with capacitor.

When the engine halted state is converted to starting state, carry out the required injection control of engine starting, but shown in Fig. 7 (B), after engine is converted to starting state, then shown in Fig. 7 (C), when control unit 10 detects by throttle valve opening position transducer 4 detected throttle valve opening signals when the judgement aperture of regulation is above, be judged to be possibility rapidly, then not carrying out fuel shown in Fig. 7 (F) sprays, shown in Fig. 7 (D), after being converted to the engine starting state, the removing of carrying out according to the drive signal (pulse) corresponding with invalid discharge time being sprayed continue stipulated time or stipulated number.

And, in the time may taking place rapidly, even, block and light a fire also shown in Fig. 7 (G), spark coil 9 not being switched in the IGNITION CONTROL and sending firing command, residual when fuel is arranged the starting of engine also be under an embargo.

In addition, as indicated above, do not start required fuel injection, the removing of carrying out according to the drive signal corresponding with invalid discharge time is sprayed to be continued, in IGNITION CONTROL, also light a fire and block and make starting when forbidding, not shown display unit is sent the information of starting illegal state, represent this content.

For example when being lamp, control unit 10 carries out the lighting of lamp or the indication of glimmering to display unit.

Claims (8)

1, a kind of fuel injection system comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And described fuel injection unit is sent the control unit of the drive signal that plunger actuation uses according to the engine running state, it is characterized in that,

Whether described control unit is in fuel according to the engine running condition judgement is blocked control mode, being judged to be when being in fuel and blocking control mode, described fuel injection unit is sent drive signal with the short time that is not enough to burner oil.

2, fuel injection system as claimed in claim 1 is characterized in that, described control unit is judged to be when engine deceleration and is in fuel and blocks control mode.

3, fuel injection system as claimed in claim 1 is characterized in that, described control unit is judged to be in engine when rotation hypervelocity and is in fuel and blocks control mode.

4, a kind of fuel injection system is characterized in that, comprising: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And the control unit that described fuel injection unit is sent drive signal, described control unit judge the engine running state be the engine pre-start state be prestart control mode, idling conditions promptly dally control mode, or fuel to block state be that fuel blocks control mode, when being described each control mode, described fuel injection unit is sent described drive signal and makes it be not enough to burner oil, and corresponding described each control mode is to switching the current"on"time of described drive signal.

5, fuel injection system as claimed in claim 4 is characterized in that, the current"on"time of the current"on"time of the drive signal when described fuel blocks control mode during than described idle running control mode is short.

6, a kind of fuel injection system comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And control unit, this control unit has according to the engine running condition judgement and goes out the mode decision member that the engine pre-start state is the prestart control mode, and when being the prestart control mode, described fuel injection unit is sent the drive signal of the pulse amplitude that is not enough to burner oil, it is characterized in that

According to the detected throttle valve opening state of described control unit, do not make described fuel injection unit start required fuel injection, and described fuel injection unit is continued to be not enough to the pulsed drive of burner oil.

7, a kind of fuel injection system comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And control unit, this control unit has according to the engine running condition judgement and goes out the mode decision member that the engine pre-start state is the prestart control mode, and when being the prestart control mode, described fuel injection unit is sent the drive signal of the pulse amplitude that is not enough to burner oil, it is characterized in that

Igniting when blocking the engine starting according to the detected throttle valve opening state of described control unit.

8, a kind of fuel injection system comprises: the fuel injection unit that utilizes the to-and-fro motion of plunger that fuel is attracted, pressurizes and sprays; And control unit, this control unit has according to the engine running condition judgement and goes out the mode decision member that the engine pre-start state is the prestart control mode, and when being the prestart control mode, described fuel injection unit is sent the drive signal of the pulse amplitude that is not enough to burner oil, it is characterized in that

Comprise a member, this member goes out to forbid the state of engine starting according to the detected throttle valve opening condition judgement of described control unit, and starting is in illegal state and shows to engine.

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