CN100410514C - Engine starting system - Google Patents

Abstract

An engine starting device is provided, comprising: a fuel injection control device; an ignition control device; an alternator; a roational velocity detecting device; as well as an automatic stop control device for stopping fuel injection automatically when the engine automatic stop condition is established; an automatic starting control device which is restarted by injection fuel ignition of the cylinder automatically stopped in an expansion stroke through a fuel injection valve when the restarting condition of the engine at the automatic stop state is established, when the automatic stop control device controls the engine at the automatic stop state, the objective generation current of the alternator is set as an initial value of a bigger value, according to the descending state of the engine roational velocity after the fuel injection is stopped, the descending amount which is a relative value between the objective generation current and the initial value is set. The rotation resistance of the crank is adjusted quickly and accurately corresponding to the descending state of the roational velocity, the piston can be stopped at a proper position reliably, the restarting performance is improved.

Description

The starting arrangement of motor

Technical field

The present invention relates to a kind of starting arrangement of motor, when the automatic stop condition of predefined motor is set up, motor is stopped automatically under the states such as idle running of motor, the engine starting gear that the motor that is in automatic stop condition is reset.

Background technique

In recent years, in order to realize the fuel cost reduction and to suppress carbon dioxide discharge capacity etc., that has developed motor stops control (so-called idling stop control (idle stop control)) technology automatically, so that motor is temporarily stopped automatically when idle running etc., carry out the driver then when restart condition such as vehicle start operation is set up motor being reset automatically.Resetting when this idling stops to control, requirement has the rapid property that motor is started at once according to vehicle start operation etc., but according to common carry out in the past, utilize starting motor to reset the method for motor through the turning crankshaft (cranking) that drives engine output shaft, its problem is that starting motor frequently is in operating state and consumes electric power, and be shortened the working life of starting motor etc.

Therefore, wish by to burner oil in the cylinder that in expansion stroke, is in halted state and in addition ignition, thereby use this burning energy to pilot engine immediately.But in expansion stroke, be in as mentioned above under the inappropriate situation of piston stop position of cylinder of halted state, for example piston stops under the situation of extremely close top dead center or bottom dead center position, air quantity in the cylinder just obviously reduces and can not get sufficient burning energy, or since burning energy to act on the stroke of piston too short etc. and might can't make the motor normal starting.

Counter-measure as the problems referred to above, for example the open communique of Japan Patent is opened shown in clear 60-128975 number in fact, bent axle at motor is provided with braking device, and controls piston that above-mentioned braking device makes the cylinder that is in halted state in expansion stroke and can stop at appropriate location in the stroke way.

Also open shown in 2001-173473 number just like the open communique spy of Japan Patent, in case judge the words that the automatic stop condition of motor is set up, just by selecting the lean air/fuel ratio jet mode that pressure of inspiration(Pi) is strengthened, make compression pressure improve and stop at assigned position so that in expansion stroke, be in the piston of the cylinder of halted state.

In addition just like shown in No. the 1403512nd, the open communique of european patent application, in case judge the words that the automatic stop condition of motor is set up, strengthen by the inspiratory flow that makes specified time limit and to promote scavenging, and gettering quantity is adjusted into makes the piston of the cylinder that in expansion stroke, is in halted state stop at assigned position.

But drive the engine starting gear shown in clear 60-128975 number in fact according to the open communique of above-mentioned Japan Patent, its problem is and need the device that the bent axle of motor is braked be set in addition with respect to the vehicle braked device, and stop at the appropriate location for the piston that makes the cylinder that in expansion stroke, is in halted state, must carry out High Accuracy Control to above-mentioned braking device, so this control is quite difficult.

And open shown in 2001-173473 number as the open communique spy of above-mentioned Japan Patent, when the automatic stop condition of motor is set up by pressure of inspiration(Pi) being strengthened make under the situation that compression pressure improves, there is the decline degree of engine rotary speed in case change, piston stop position will change, thereby is difficult to make piston just in time to stop to be fit to the problem of the position that motor resets.

At the problems referred to above, engine starting gear shown in No. the 1403512nd, the open communique of above-mentioned european patent application, be to carry out under the air-breathing state piston being stopped to the cylinder that in expansion stroke, is in halted state fully guaranteeing, thereby all keep stable until the action of halted state piston, even if engine rotary speed decline degree has deviation, also be easy to make piston to stop at assigned position.And, scavenging can be promoted by interim increasing inspiratory flow, thereby also enough amount of fresh air can be guaranteed under the situation that has just stopped just starting at motor.

But in the engine starting gear shown in No. the 1403512nd, the open communique of above-mentioned european patent application, air-breathing volume flowrate is subjected to the dispar influences of condition such as the difference, engine temperature of suction system and motor individual difference and deviation takes place, thereby is difficult to avoid the stop position generation deviation of piston.Thereby, comparatively it is desirable to suppress the deviation of piston stop position, make piston stop at the appropriate location of carrying out engine start easily more reliably.

Summary of the invention

The present invention is directed to the problems referred to above, its purpose is to provide a kind of can make piston stop at the appropriate location more reliably when motor stops automatically with simple structure, improves the engine starting gear of restarting performance of motor.

Engine starting gear of the present invention is the fuel injection control system that comprises for control its fuel injection amount and fuel injection time to the Fuelinjection nozzle of each cylinder direct fuel injection; To the ignition control device of controlling the firing time of the spark plug of described each cylinder setting; By engine-driving and the target generation current that generation current is reached set and the alternator that operates; And the starting arrangement of the motor of the rotary speed detecting device of detection of engine rotational speed, the starting arrangement of this motor comprises: spray by the fuel from described Fuelinjection nozzle that stops to make the motor continuous running when the automatic stop condition of predefined motor is set up and make the self-braking automatic stop control of motor; And when the restart condition of the motor that is in automatic stop condition is set up by described Fuelinjection nozzle to self-braking cylinder injection fuel in expansion stroke at least, burn by described plug ignition, the automatic start-control device that motor is reset, wherein said automatic stop control, when motor is stopped automatically, the target generation current of alternator is set at the initial value that preestablishes into higher value, and the engine rotary speed decline state that is produced corresponding to fuel injection stopping back being set the slippage of described target generation current with respect to described initial value then.

Comparatively it is desirable among the present invention, described automatic stop control sprays the fuel that execution stops described Fuelinjection nozzle so that the self-braking engine rotary speed of motor is set at the numerical value that is higher than common idling rotational speed, spray simultaneously and be in when being higher than described common idling rotational speed regional when the detected engine rotary speed of described rotary speed detecting device after stopping at fuel, set the described initial value of the target generation current of described alternator, and when the detected engine rotary speed of described rotary speed detecting device is in described common idling rotational speed with lower area, set the slippage of described target generation current with respect to described initial value.

Among the present invention comparatively ideal be, described automatic stop control with the setting period stipulation from the target generation current of described initial value decline established amount of described alternator be till the 2nd compression top center before any cylinder stops through motor during.

Among the present invention comparatively ideal be, motor is when being in 4 stroke engines of 180 ° of crank angles (CA) phase difference with one stroke, described automatic stop control, in the moment that any cylinder passes through the 4th to the 6th compression top center before motor stops, setting the described slippage of described target generation current.

Among the present invention comparatively ideal be, described automatic stop control, be in the regulation rotational velocity range in the top dead center rotational speed of motor, according to the piston of cylinder arbitrarily the moment by compression top center, infer the moment of the 4th to the 6th compression top center before described any cylinder stops through motor.

And, among the present invention comparatively ideal be, automatically behind the 2nd compression top center of stop control before cylinder stops through motor arbitrarily, after enter compression stroke second half section of cylinder of compression stroke by the injection of described Fuelinjection nozzle execution fuel.

Among the present invention comparatively ideal be, automatically the moment of 2nd compression top center of stop control basis before cylinder stops through motor arbitrarily is by the detected top dead center rotational speed of described rotary speed detecting device, the described compression stroke second half section is set by the fuel injection amount of described fuel injection valves inject, this top dead center rotational speed is high more, and the value that sets is big more.

And, among the present invention comparatively ideal be, comprise the inspiratory flow controlling device that the inspiratory flow that flow in the cylinder is regulated in the motor, described automatic stop control is when stop condition is set up automatically, the speed change state of automatic speed variator is switched to neutral state from driving condition, by described inspiratory flow regulating device the inspiratory flow that flow in the cylinder is added greatly greater than the inspiratory flow under the described common idling rotational speed state, under the engine rotary speed that is higher than described common idling rotational speed, carry out the fuel that stops described Fuelinjection nozzle then and spray, and set the described initial value of described target generation current.

In addition, among the present invention comparatively ideal be, during the motor of described automatic stop control after stopping the fuel injection decommissions, the crank shaft angle of motor reaches the moment of predefined detection angles, according to the detected engine rotary speed of described rotary speed detecting device, the slippage of described target generation current with respect to described initial value is set at, and the numerical value under the low situation of this engine rotary speed is greater than the numerical value under the higher situation.

Among the present invention comparatively ideal be, during the motor of described automatic stop control after stopping the fuel injection decommissions, in the moment of piston, according to set the slippage of described target generation current by the detected engine rotary speed of described rotary speed detecting device with respect to described initial value by compression top center.

Description of drawings

Fig. 1 is the general profile chart with motor of starting arrangement of the present invention.

Fig. 2 is the suction system of expression motor and the explanatory drawing that vent systems constitutes.

Fig. 3 is the schematic representation of the relation of the piston stop position of the expression motor cylinder that is in expansion stroke and compression stroke when stopping and air quantity.

Fig. 4 is the sequential chart of expression motor engine rotary speed state of changing etc. when decommissioning.

Fig. 5 is the sequential chart of expression motor throttle opening (opening) and target generation current state of changing etc. when decommissioning.

Fig. 6 is the distribution map of the correlation of engine rotary speed and piston stop position during the expression motor decommissions.

Fig. 7 is the distribution map of correlation of the piston stop position of the rotational speed of 2nd top dead center of expression motor before stopping and the motor cylinder that is in expansion stroke when stopping.

Fig. 8 is the flow chart that the expression motor stops to control the front half part of running automatically.

Fig. 9 is the flow chart that the expression motor stops to control the intermediate portion of running automatically.

Figure 10 is the flow chart that the expression motor stops to control the latter half part of running automatically.

Figure 11 is the illustration table of conversion that expression is used for setting according to engine rotary speed the target generation current of alternator.

Figure 12 is a flow chart of representing to control when motor is reset the running front half part.

Figure 13 is a flow chart of representing to control when motor is reset the running intermediate portion.

Figure 14 is a flow chart of representing to control when motor is reset the running latter half part.

Figure 15 is the sequential chart that the expression motor is reset time burning running etc.

Figure 16 is the sequential chart of expression motor engine rotary speed state of changing etc. when resetting.

Figure 17 is the sequential chart of the generation current state of changing of expression alternator.

Embodiment

The summary that Fig. 1 and Fig. 2 illustrate 4 stroke spark ignition engines of the starting arrangement with motor of the present invention constitutes.Comprise engine main body 1 and engine control ECU (ECU) 2 in this motor with cylinder head 10 and cylinder seat 11.Above-mentioned engine main body 1 is provided with 4 cylinder 12A ~ 12D, and there is the piston 13 that is connected with bent axle 3 inside of each cylinder 12A ~ 12D by intercalation, thereby forms firing chamber 14 above it.

The top of the firing chamber 14 of above-mentioned each cylinder 12A ~ 12D is provided with spark plug 15 makes the spark plug front end be in the top of 14 inside, firing chamber.Each spark plug 15 is connected with ignition mechanism 27, produces electrical spark in order to start spark plug 15.

14 sidepiece (right side shown in Fig. 1) is provided with Fuelinjection nozzle 16 to firing chamber 14 inner direct fuel injections to each cylinder 12A ~ 12D in the firing chamber.This Fuelinjection nozzle 16 only constitutes and to open valve being driven in the pairing time with pulse width from the pulse signal of above-mentioned ECU2 input, will be ejected near the electrode of above-mentioned spark plug 15 corresponding to the fuel of the amount of this opening valve time.

And the top of the firing chamber 14 of above-mentioned each cylinder 12A ~ 12D is provided with the suction port 17 and the exhaust port 18 of 14 openings towards the firing chamber, and above-mentioned port one 7,18 is respectively fitted with Aspirating valves 19 and outlet valve 20.Above-mentioned Aspirating valves 19 and outlet valve 20 be by being driven by the valve mechanism with camshaft etc. (omitting diagram), and the switching of the Aspirating valves of each cylinder 12A ~ 12D and outlet valve 19,20 is set at each cylinder 12A ~ 12D constantly to have the prescribed phases difference and carry out burn cycle.

Above-mentioned suction port 17 and exhaust port 18 are connected with air suction way 21 and exhaust passageway 22.Near the downstream side of the air suction way 21 of above-mentioned suction port 17 as shown in Figure 2, the corresponding independently branch's air suction way 21a that forms with each cylinder 12A ~ 12D, the upstream extremity of this each air suction way 21a of branch are communicated with compensator (surge tank) 21b respectively.The upstream side of this compensator 21b is provided with common air suction way 21c, and this common air suction way 21c disposes the air throttle 23 (inspiratory flow controlling device) that is driven by actuator 24.The upstream side of this air throttle 23 and downstream side dispose air flow sensor 25 that detects inspiratory flow and the inspiratory pressure sensor 26 that detects pressure of inspiration(Pi) (negative pressure) respectively.

And above-mentioned engine main body 1 is additional to be provided with the alternator (generator) 28 that is connected with bent axle 3 by synchronous belt etc.This alternator 28 constitutes to be built-in with adjusts circuit 28a to adjust the target generation current by controlling the electric current adjusting output voltage that omits illustrated field coil, according to the control signal that above-mentioned ECU2 exported of input this adjustments circuit 28a, carry out and the control of corresponding target generation current such as the electrical load of vehicle and on-vehicle battery voltage at ordinary times.

In addition, above-mentioned motor also is provided with 2 crankshaft angle sensors 30,31 that detect bent axle 3 angle of rotation and (is rotary speed detecting device, play the effect of rotation speed sensor), according to the testing signal of one of them crankshaft angle sensor 30 outputs rotational speed with detection of engine, and the different testing signal of phase place that both export according to above-mentioned crankshaft angle sensor 30,31 as the back is addressed detects the sense of rotation and the angle of swing of bent axle 3.

What input to above-mentioned ECU2 is each testing signal that comprises that following sensor is exported respectively: the cam angle sensor 32 that the specific rotational position of the cylinder that is provided with on camshaft identification usefulness is detected; The cooling-water temperature sensor 33 that engine cooling water temperature is detected; The throttle sensor 34 that the corresponding accelerator open degree of throttle operation amount with the driver is detected; And the braking sensor 35 that detects of the brake operating that the driver is carried out.

And, ECU2 constitutes and receives above-mentioned each sensor 25,26,30 ~ 35 testing signal of being exported, control signal to Fuelinjection nozzle 16 output control fuel injection amounts and discharge time, export the control signal of controlling throttle openings simultaneously to the additional control signal that is arranged at the 27 output control ignition times of ignition mechanism on the spark plug 15, and to the actuator 24 of above-mentioned air throttle 23.In addition, as addressing, the back carries out control, when the automatic stop condition of predefined motor is set up by stopping constantly that with regulation the fuel of each cylinder 12A ~ 12D is sprayed (interrupts fuel), motor is stopped automatically, and after this owing to the driver quickens when operation etc. is set up restart condition motor to be reset automatically.

Specifically, ECU2 functionally comprises: to the fuel injection control system of Fuelinjection nozzle 16 control fuel injection amounts and fuel injection time; And ignition timing controller to controlling the firing time of spark plug 15.In addition, ECU also functionally comprises: spray by the fuel from Fuelinjection nozzle 16 that stops to make the motor continuous running when the automatic stop condition of predefined motor is set up and make the self-braking control device (stop control automatically) that stops automatically of motor; And when the restart condition of the motor that is in automatic stop condition is set up by 16 pairs of Fuelinjection nozzles self-braking cylinder (among 12A ~ 12D any one) burner oil, the automatic starting control device (start-control device automatically) that burns motor is reset by spark plug 15 igniting in expansion stroke at least.

The starting of above-mentioned automatic start-control device specifically, at first by when motor stops automatically, in piston 13 stops at compression stroke cylinder in the compression stroke way, is carried out primary combustion, to press down this piston 13 bent axle 3 is reversed slightly.Thus when motor stops automatically, the piston 13 that makes piston 13 stop at the expansion stroke cylinder in the expansion stroke way temporarily raises, and under the state of the mixed gas in this cylinder of compression, to this ignition of mixed gas and burning, thereby provide the driving torque of positive veer that motor is reset to bent axle 3.

As mentioned above, do not restart motor in order not use in principle, and motor is suitably reset as long as the fuel that is ejected into specific cylinder lighted a fire, therefore must fully guarantee the to burn resulting burning energy of mixed gas of above-mentioned expansion stroke cylinder makes the cylinder that after this then enters compression top center overcome the compression opposition and crosses compression top center.So when motor stopped automatically, piston 13 is in the above-mentioned expansion stroke cylinder in the expansion stroke way must guarantee the sufficient air amount in advance.

Specifically, as Fig. 3 (a), shown in Fig. 3 (b), motor stops constantly to be in the cylinder of expansion stroke and compression stroke, the phase place 180 ° of CA (180 ° of crank angles) that just in time stagger, thereby each piston 13 separately are running in the opposite direction each other, and the piston 13 of expansion stroke cylinder is in the words of stroke central authorities near lower dead center one side position, air quantity is just more in this cylinder, thereby can be fully burned energy.But the piston 13 of above-mentioned expansion stroke cylinder is in terrifically the position near lower dead center, and air quantity and can't obtain to be enough to burning energy that bent axle 3 is reversed just very little in the compression stroke cylinder.

Otherwise, can make piston 13 stop at the stroke central authorities of above-mentioned expansion stroke cylinder, be that crank angle behind the compression top center is that 90 ° of CA positions are in the proper range of 100 ° ~ 120 ° of CA near crank angle behind the predetermined range R of lower dead center one side, for example compression top center slightly, just can guarantee the air of established amount in the compression stroke cylinder, just can obtain the burning energy that bent axle 3 is reversed slightly by above-mentioned primary combustion.And, also can reset by the burning energy of in the expansion stroke cylinder, guaranteeing more air quantity, produce to be enough to bent axle 3 is just being changeed with making engine reliable.

And, provide suitable load as the generated energy control that in motor decommissions process, can lean on alternator 28 rapidly to motor, promptly the generated energy size of alternator 28 can about put in the engine rotary speed scope of load size of motor, decline state corresponding to engine rotary speed, can control alternator 28 generated energy with higher responsiveness (responsiveness), piston 13 is stopped in the above-mentioned proper range more reliably.

Therefore, utilization is arranged at the automatic stop control of above-mentioned ECU2, as shown in Figure 4, set up t0 constantly at the automatic stop condition of motor, the target rotational speed of motor is set at the numerical value that is higher than the common idling rotational speed when motor is stopped automatically, for example the idling rotational speed is set in the motor of 650rpm (automatic speed variator is in driving condition) usually, above-mentioned target velocity (the idling rotational speed when stop condition is set up automatically) is set at (automatic speed variator is in neutral state) about 810rpm, makes the rotational speed Ne of motor be stabilized in the rotational speed that is higher than common idling rotational speed slightly thus.Specifically, set up t0 constantly at the automatic stop condition of motor, automatic speed variator is switched to neutral state from driving condition, and (shift range (shift range) still remains under the situation of driving scope (drive range), switch to neutral state from driving condition) reduce added external loading on the motor (load of automatic speed variator), and make engine rotary speed Ne transition for being higher than the rotational speed of common idling rotational speed slightly by the aperture K that increases air throttle 23, make the inspiratory flow that flows in cylinder inspiratory flow (the MIN inspiratory flow that the motor continuous running is required) when for example making air fuel ratio in the cylinder be set at the common idling of λ=1.

And, stabilize to the later moment t 1 of target velocity at the rotational speed Ne of motor and make fuel spray the rotational speed Ne that stops with the reduction motor.But, even in order to realize that stopping the fuel injection also can make the fuel perfect combustion that has been ejected into each cylinder, so constant ignition is up to passing through the time that the fuel in each cylinder can burn that is supplied at least.

In addition, in the starting stage that makes the self-braking control running of motor is that above-mentioned fuel injection stops t1 constantly, further strengthen the aperture K of above-mentioned air throttle 23, that is to say, the air fuel ratio that combustion regime before the above-mentioned moment t1 is in the cylinder is set at λ=1 and near even burning thereof, thereby spray at above-mentioned fuel and to stop t1 constantly, the aperture K of air throttle 23 is strengthened (being set at about 30% aperture of standard-sized sheet for example), the inspiratory flow that will be drawn into engine cylinder 12A ~ 12D is set at the state that the required MIN inspiratory flow of ratio engine continuous running has more established amount, guarantee the scavenging performance of combustion gas, and spray at above-mentioned fuel and to stop t1 constantly, set up the low of moment t0 by the target generation current Ge that makes alternator 28 than above-mentioned automatic stop condition, reduce the rotational resistance of bent axle 3.

And, by stop the fuel injection at the above-mentioned moment t1 engine rotary speed Ne is reduced, and, close above-mentioned air throttle 23 confirming that predefined reference speed reaches for example moment t2 below the 760rpm.Begin to lower from this air throttle 23 close moment t2 to boost pressure (air suction way pressure) Bt, the inspiratory flow that imports to each cylinder of motor reduces, the air that imports to common air suction way 21c during the above-mentioned air throttle 23 close moment t2 imports the 4th cylinder 12D, the 2nd cylinder 12B, the 1st cylinder 12A and the 3rd cylinder 12C that enters suction stroke with the regulation transportation lag as shown in Figure 5 successively by via compensator 21b and the air suction way 21a of branch.So, by considering above-mentioned air-breathing transportation lag air throttle 23 close moment t2 being set at appropriate time, the 3rd cylinder 12C that is in compression stroke when stopping with motor compares, and can import more air to the 1st cylinder 12A that is in expansion stroke.

In addition, confirming that engine rotary speed Ne is reduced to reference speed N2 or following moment t2, make the target generation current Ge of alternator 28 add greatly higher value temporarily, and be in moment t3 in the predetermined range as the top dead center rotational speed ne that addresses later at motor, by regulate the target generation current Ge of alternator 28 corresponding to the reduction degree of engine rotary speed Ne, carry out the control that engine rotary speed Ne is reduced along reference line according to the settings of carrying out in advance such as test result.

When motor is stopped automatically, stop t1 constantly from the fuel injection, mechanical loss that the kinetic energy that bent axle 3, flywheel etc. are had causes by surface friction drag and the acting of the pump of each cylinder 12A ~ 12D are consumed, the bent axle 3 of motor rotates a few under effect of inertia, for example 4 stroke engines of 4 cylinders stop later on through compression top center about 10 times.Specifically, as shown in Figure 4 and Figure 5, whenever above-mentioned each cylinder 12A ~ 12D through compression top center, engine rotary speed Ne just temporarily descends, then just raises once again in the moment of crossing compression top center, so engine rotary speed Ne is when repeating above-mentioned fluctuation and progressively reduce.

In addition, it is the crank shaft angle of 0 ° of CA that the sequential chart of crank shaft angle CA shown in Figure 5, solid line illustrate the top dead center (TDC) that makes the 1st cylinder 12A and the 3rd cylinder 12C, and dot and dash line then illustrates and makes the top dead center of the 2nd cylinder 12B and the 4th cylinder 12D is the crank shaft angle of 0 ° of CA.In 4 stroke engines of 4 cylinders, have 180 ° of CA phase differences between cylinder 12B, the 12D shown in cylinder 12A, 12C shown in the above-mentioned solid line and the dot and dash line, thereby can show whenever 180 ° of CA always have a certain cylinder by above-mentioned sequential chart and enter compression top center.

Next, before stopping, crossing by motor after the moment t5 of last compression top center, enter the cylinder 12C of compression top center, air pressure causes the rising of piston 13 along with inertial force and improves, and makes bent axle 3 reverse by this compression opposition back-pressure piston 13.Utilize the reverse of this bent axle 3 that expansion stroke cylinder 12A air pressure is improved, thereby the piston 13 of expansion stroke cylinder 12A just compresses opposition back-pressure to lower dead center one side with it, thereby make that bent axle 3 begins just to change once again, the reverse of this bent axle 3 and just changeing repetition and make piston 13 back and forth stop after the running for several times.The stop position of this piston 13 is roughly decided by the equilibrium state of the compression opposition of above-mentioned compression stroke cylinder 12C and expansion stroke cylinder 12A, but also be subjected to the influences such as surface friction drag of motor, and with the engine revolution inertia of the moment t5 that crosses above-mentioned last compression top center, be that the height of engine rotary speed Ne changes.

So, the piston 13 that is in the expansion stroke cylinder 12A of expansion stroke when motor is stopped automatically stopping in the above-mentioned proper range R that is fit to reset, need make at first that the compression opposition of above-mentioned expansion stroke cylinder 12A and compression stroke cylinder 12C is respectively enough big, and metering needle to the inspiratory flow of two cylinder 12A, 12C make expansion stroke cylinder 12A the compression opposition than the big specified value of compression opposition of compression stroke cylinder 12C or more than.Therefore, this mode of execution stops t1 constantly the aperture K of air throttle 23 is set at higher value by spraying at fuel, after sucking the established amount air by above-mentioned expansion stroke cylinder 12A and compression stroke cylinder 12C, reducing its aperture K above-mentioned suction air quantity is being regulated by closing above-mentioned air throttle 23 through the moment t2 of stipulated time.

But in the actual motor, because air throttle 23, there is individual difference in shapes such as suction port 17 and the air suction way 21a of branch, make that wherein flow air changes to some extent, thereby the inspiratory flow that is sucked at each cylinder 12A ~ 12D of the automatic stopping period of motor produces deviation, and because deviation also takes place in the individual difference of motor and the different surface friction drag of motor that make of height of engine temperature, even if, also the piston stop position that stops at motor being in the cylinder 12A of expansion stroke constantly and being in the cylinder 12C of compression stroke can't be brought in the proper range R so as mentioned above air throttle 23 is carried out open and close controlling.

For this point, the present invention is conceived to, in the engine rotary speed Ne of the automatic stopping period of motor reduction process, an example as shown in Figure 6, each cylinder 12A ~ 12D during by compression top center engine rotary speed (top dead center rotational speed) ne and the piston stop position of the motor cylinder 12A that stops constantly to be in expansion stroke between have clear and definite correlation.And, as shown in Figure 4 and Figure 5, stop in the process of t1 rear engine rotational speed Ne reduction constantly in the fuel injection, the engine rotary speed top dead center rotational speed ne of piston 13 by detecting each cylinder 12A ~ 12D respectively during by compression top center, and according to the target generation current Ge of the checkout value of this top dead center rotational speed ne control alternator 28, the decline degree of regulating engine rotary speed Ne.

Specifically, Fig. 6 is, aforesaid engine rotary speed Ne reach fixing speed constantly t1 stop fuel and spray, in stipulated time scope after this, keep air throttle 23 and be in out the valve state, top dead center rotational speed ne when measuring the piston 13 that is provided with in each the cylinder 12A ~ 12D by the motor of effect of inertia rotation by compression top center, check that simultaneously motor stops the piston position of expansion stroke cylinder 12A constantly, with this piston position is the longitudinal axis, the top dead center rotational speed ne of above-mentioned motor is a transverse axis, and both sides relation is illustrated with chart.Repeat above-mentioned operation just can obtain to represent motor decommission during the distribution map of the correlation of piston stop position among above-mentioned top dead center rotational speed ne and the expansion stroke cylinder 12A.

Can find the correlation of the regulation between the piston stop position among top dead center rotational speed ne during motor decommissions and the expansion stroke cylinder 12A by above-mentioned distribution map, from example shown in Figure 6 as can be known, the the 6th ~ the 2nd top dead center rotational speed ne that motor is in before the halted state is in the scope shown in the hacures, and the stop position of above-mentioned piston 13 just enters and is fit in the scope R (100 ° ~ 120 ° CA behind the compression top center) that motor resets.

Especially be in halted state the 2nd top dead center rotational speed ne before with regard to motor, as shown in Figure 7, above-mentioned top dead center rotational speed ne is in the scope of 280rpm ~ 380rpm roughly, and be the boundary with about 320rpm, when being in the slow-speed of revolution below the 320rpm, along with the reduction of above-mentioned top dead center rotational speed ne, piston stop position is progressively near top dead center.And above-mentioned top dead center rotational speed ne is when being in 320rpm or above high rotating speed, no matter this top dead center rotational speed ne size how, the stop position of piston 13 immobilizes substantially, is in substantially in the proper range R.

Can think, why the distribution trend of feature as mentioned above appears, be because engine tope center rotational speed ne is in 320rpm or above high-revolving words, expansion stroke cylinder 12A when motor stops and compression stroke cylinder 12C just can be filled with the air of q.s respectively, and the compression opposition by this air concentrates near the central authorities of stroke piston stop position.Can think in addition, why piston stop position presents the distribution that descends left when the above-mentioned 320rpm or the following slow-speed of revolution, be since among each cylinder 12A ~ 12D pistons reciprocating 13 after compression top center one side counter-rotating, because deceleration such as surface friction drag and can't turn back to the cause that the position of stroke central authorities just stops.

And spray the occasion that makes it to keep closed condition under the situation of no longer air throttle 23 being carried out open operation after stopping at fuel, as shown in phantom in Figure 7, present the distribution that rises uniformly to the right, the stop position of piston 13 just changes with the height of engine tope center rotational speed ne.This be because, in case air throttle 23 is kept closes, just be maintained bigger (pressure of inspiration(Pi) the is low) state of intake negative-pressure, its compression opposition of cylinder that becomes expansion stroke cylinder 12A and compression stroke cylinder 12C after motor stops just to reduce, thereby relative increase of influence of rotational speed of motor (rotatory inertia) and surface friction drag.

So, as shown in Figure 4 and Figure 5, from stopping fuel injection time point t1 through the stipulated time, promptly be reduced to reference speed (for example about 760rpm) or following moment t2 to engine rotary speed Ne, in order to suppress fully to guarantee when above-mentioned rotatory inertia and surface friction drag influence the scavenging performance of each cylinder 12A ~ 12D, wish the aperture K of air throttle 23 is set at relatively large value (for example 30% of standard-sized sheet aperture).And, for being maintained, engine rotary speed Ne can make above-mentioned piston 13 stop at the speed of the control of appropriate location, and can spray at above-mentioned fuel and stop t1 constantly the target generation current Ge of alternator 28 for example is set at 0.

And, by be reduced to reference speed N2 or following moment t2 at engine rotary speed Ne, reduce the aperture K of above-mentioned air throttle 23, after controlling the target generation current Ge that makes alternator 28 simultaneously and setting (risings) and be predefined initial value, be reduced to predetermined range with interior moment t3 at the top dead center rotational speed ne of motor, make the target generation current Ge of above-mentioned alternator 28 be reduced to the corresponding numerical value of reduction state with engine rotary speed Ne, specifically, the reduction state of engine rotary speed Ne just can fully be understood by the top dead center rotational speed ne that holds above-mentioned moment t3, thereby according to this constantly the top dead center rotational speed ne of t3 set the slippage of the target generation current Ge of alternator 28 with respect to above-mentioned initial value, regulate the rotational resistance of bent axle 3, the external loading of motor and the reduction situation of engine rotary speed Ne are changed accordingly, engine rotary speed Ne is reduced along the reference line that sets according to the test carried out in advance etc.

Specifically, the top dead center rotational speed ne of detection of engine in the process that engine rotary speed Ne reduces along the said reference line, by being judged to be that this top dead center rotational speed ne for example is in 480rpm ~ 540rpm (thereby is to have reduced fixing speed can comparatively correctly detect the top dead center rotational speed ne that engine rotary speed Ne reduces state, be the rotational velocity range that alternator 28 can be given full play to its electricity generate function), passed through the engine tope center rotational speed ne of the moment t3 of 4th ~ 6th compression top center of motor before entering halted state according to the piston 13 of having confirmed a certain cylinder, carved t3 at this moment and set the slippage with respect to above-mentioned initial value with the corresponding above-mentioned target generation current Ge of reduction state of engine rotary speed Ne.Specifically, top dead center rotational speed ne according to above-mentioned moment t3, be set at the conversion figure (wherein the maximum value of the target generation current Ge of this conversion is the numerical value less than above-mentioned initial value) of big more value from the big more then target of engine tope center rotational speed ne generation current Ge shown in Figure 11, reading and the corresponding target generation current of above-mentioned top dead center rotational speed ne checkout value Ge, is the target generation current Ge of alternator 28 with this setting value.

Thus, before engine rotary speed Ne is reduced to below the specified value, be engine rotary speed Ne be reduced to the rotational speed (for example 420rpm) that can give full play to alternator 28 power generation performances or following before, above-mentioned alternator 28 is regulated the decline degree of engine rotary speed Ne with operating state.

In addition, in with one stroke, be between the cylinder in 4 stroke engines of 180 ° of CA phase places, when carrying out the present invention and controlling, having confirmed to reach the moment t3 of above-mentioned desirable top dead center rotational speed ne, is the moment of the 4th ~ the 6th compression top center before a certain cylinder enters motor and stops.

And, initial value when engine rotary speed Ne is reduced to target generation current Ge that benchmark N2 speed or following moment t2 make alternator 28 and raises, be set at the big numerical value of maximum value than the target generation current Ge that from above-mentioned conversion figure, reads, make the target generation current Ge decline that is increased to initial value at above-mentioned moment t2 at above-mentioned moment t3, control the target generation current Ge of alternator 28 thus according to the checkout value of above-mentioned top dead center rotational speed ne.The target generation current Ge that for example reads from above-mentioned conversion figure is set at the occasion of 0 ~ 50A, above-mentioned initial value can be set at numerical example such as the 60A higher than its maximum value 50A.And, after above-mentioned moment t2 is set at 60A with target generation current Ge,, the target generation current of alternator 28 is descended according to this numerical value in the slippage of above-mentioned moment t3 according to the above-mentioned target generation current of the setting value Ge that from conversion figure, reads.

By carrying out the generation current control of alternator 28 as mentioned above, at moment t5 by last compression top center, the potential energy that air had that the kinetic energy that bent axle 3, flywheel, piston 13 and connecting rod etc. are had, compression stroke cylinder 12C are compressed etc. just balance each other with the surface friction drag loss etc. of effect after this, the piston 13 of the cylinder 12A that is in expansion stroke under engine stop-state are stopped at be fit in the scope R that motor resets.

Control running when utilizing the automatic stop control of above-mentioned ECU2 that motor is stopped automatically according to Fig. 8 ~ flowchart text shown in Figure 10.This control running is in case start, and just can carry out to judging whether to be in whether the automatic suspension of licence sign F that motor stops the operating condition to control automatically is that " ON " state is judged (step S1).This automatic suspension of licence sign F is set at, satisfying the speed of a motor vehicle is that specified value (for example 10km/h) or above, steering angle are that specified value or following, cell voltage are the occasion that reference value or above and air-conditioning are in conditions such as " OFF " state, judge be in motor can self-braking state and be " ON " state.

Above-mentioned steps S1 is judged to be sure occasion, judge whether throttle sensor 34 is whether " OFF " state and braking sensor 35 are " ON " state (step S2), be judged to be certainly, confirmed that vehicle is in the occasion of deceleration regime, judge the whether judgment standard value F/CON (step S3) of failure of fuel during greater than the deceleration that is redefined for about 1100rpm of engine rotary speed Ne, be judged to be negative occasion, transfer to following step S7.

Be judged to be among the above-mentioned steps S3 certainly, confirmed the occasion of the judgment standard value F/CON of failure of fuel when engine rotary speed Ne is greater than above-mentioned deceleration, carry out the failure of fuel (FC) (step S4) when slowing down.Next, judge whether engine rotary speed Ne is reduced to judgment standard value F/COFF or following (the step S5) of the fuel recovery that is redefined for the 900rpm effect, being judged to be the failure of fuel (FC) of the sure moment when stopping above-mentioned deceleration, revert to common fuel spray regime (step S6).

Next, judge that current whether to be in the phase state that the air fuel ratio in cylinder 12A ~ 12D is set at the numerical value more much bigger than stoichiometric air/be the operating condition (step S7) of layering phase, be judged to be sure occasion, the target rotational speed of motor is set at the numerical value that exceeds established amount than common idling rotational speed (about 650rpm), for example be set at about 750rpm, keep this speed (step S8).In addition, above-mentioned steps S7 is judged to be negative, confirm as and be in the occasion that the air fuel ratio in the cylinder is set at the operating condition of stoichiometric air/and near even burning thereof, the target rotational speed of motor is set at the numerical value also higher than above-mentioned 750rpm, for example be set at about 800rpm, keep this speed (step S9).

Then, whether judge that throttle sensor 34 is in " ON " state or braking sensor 35 is in " OFF " state, promptly judge whether remove deceleration regime (step S10), be judged to be sure occasion, turn back to above-mentioned steps S1 and repeat above-mentioned control running.And that above-mentioned steps S10 is judged to be is negative, confirms as the occasion of not removing deceleration regime as yet, judges whether the speed of a motor vehicle is 0, promptly judge whether be in vehicle stop state thereby automatically stop condition set up (step S11).

Above-mentioned steps S11 is judged to be certainly, confirm as the occasion that is in vehicle stop state, judge this constantly t0 whether to be in the phase state that the air fuel ratio in the cylinder is set at the numerical value more much bigger than stoichiometric air/be layering phase state (step S12), be judged to be certainly, confirm as the occasion that present engine is in the operating condition of layering phase, the target rotational speed N1 of motor is set at the numerical value that exceeds established amount than common idling rotational speed (about 650rpm), for example be set at (step S13) about 810rpm, simultaneously in order to improve the scavenging performance of each cylinder 12A ~ 12D, the EGR valve (not shown) that is provided with in the EGR path cuts out make exhaust gas recirculation stop (step 14).

And, be judged to be negative at above-mentioned steps S12, confirming as motor is not the occasion that is in the operating condition of layering phase, in order to realize for example reduction of catalyst temperature and the renewal of NOx catalyzer, confirm as and be in the occasion that the air fuel ratio in the cylinder is set at stoichiometric air/and near even combustion regime thereof, the target rotational speed N1 of motor is set at the numerical value also higher than above-mentioned 810rpm, for example be set at (step S15) about 860rpm, and operation air throttle 23 on the valve opening position aperture K of air throttle 23 is carried out feedback control so that supercharging Bt become setting for example-goal pressure P1 (step S16) about 400mmHg, automatic speed variator is switched to neutral state to be in no-load condition (step S17) from driving condition.

Confirm that at step S1 the speed of a motor vehicle is in the travelling state that is higher than 10km/h as mentioned above, and the automatic suspension of licence sign F of motor is in effective status, and confirm as the occasion that vehicle is in deceleration regime (braking sensor 35 is in starting state) at step S2, execution makes the target rotational speed N1 of motor be stabilized in control with the corresponding specified value of engine combustion state, thereby can be reduced to common idling rotational speed (650rpm) before at engine rotary speed Ne, to motor execution stopping automatically control.So, be increased to the occasion of above-mentioned target rotational speed N1 as the engine rotary speed Ne that will temporarily be reduced to common idling rotational speed, can prevent that rising with engine rotary speed Ne from bringing unplessantness displeasure to the driver or making motor stop drawbacks such as needed time is oversize automatically takes place.

And, it is more and be in the occasion of the layering phase state that can fully guarantee each cylinder 12A ~ 12D scavenging performance to import to air quantity in each cylinder 12A ~ 12D as mentioned above, with to import to air quantity in each cylinder 12A ~ 12D less and occasion that be in the even combustion regime that is difficult to fully to guarantee each cylinder 12A ~ 12D scavenging performance is compared, because above-mentioned target rotational speed N1 is set at low numerical value, thereby its advantage is, under above-mentioned layering phase state, guarantee the scavenging performance, and can prevent that engine rotary speed Ne is too big and cause fuel cost to increase, or drawback such as undesirable burning sound takes place take place.

In addition, being judged to be the speed of a motor vehicle at above-mentioned steps S11 is 0, confirm as the moment t0 that the automatic stop condition of motor is set up, target rotational speed N1 with motor among above-mentioned steps S13, the S15 is set at specified value, and among the above-mentioned steps S17 by automatic speed variator is switched to neutral state from driving condition, alleviate the load of automatic speed variator, thereby engine rotary speed Ne just sets up constantly rising slightly from automatic stop condition as shown in Figure 4.

Then, be judged to be certainly, confirm as after the moment t0 of the automatic stop condition establishment of motor, judge whether experienced the stipulated time (step S18) that is redefined for about 1 second at above-mentioned steps S11.This step S18 is judged to be negative occasion, repeat this judgement running, be judged to be the sure moment, judge whether the stop condition (FC condition) that fuel sprays is set up, specifically, judge whether to be stabilized in that engine rotary speed Ne reaches target rotational speed N1 and boost pressure Bt reaches the state (step S19) that above-mentioned target is pressed P1.In addition, throttle sensor 34 is in closed condition in the above-mentioned judgement running, or braking sensor 35 is in the occasion of starting state, returns in that fuel is sprayed under the situation about stopping.Thus, the speed of a motor vehicle be after 0 and then transition be the occasion of travelling state, can prevent unsuitable motor and stop automatically.

Next, be judged to be certainly, confirm as the moment (moment t1 among Fig. 4 and Fig. 5) that engine rotary speed Ne and boost pressure Bt are in steady state at above-mentioned steps S19, fuel is sprayed stop back (step S20), the target generation current Ge of alternator 28 is set at 0 and make generating stop (step S21), make air throttle 23 drive valve simultaneously, its aperture K is set at for example about 30% (step S22).

Then, above-mentioned steps S20 judges whether stop moment t1 from the fuel injection has experienced the stipulated time, judge that promptly fuel sprays the end (step S23) of whether burning of the fuel stop the to spray back before entering compression top center 2 times, make the igniting of above-mentioned ignition mechanism 27 stop (step S24) being judged to be the sure moment.Next, by judging whether engine rotary speed Ne reaches reference speed N2 or following (the step S25) that is redefined for about 760rpm, spray at fuel shown in Figure 4 and to stop constantly that t1 judges later on whether engine rotary speed Ne begins to reduce, to make air throttle 23 be in closed condition and make its aperture K be 0% (step S26) being judged to be sure moment t2.Therefore, make air throttle 23 open, be elevated near the boost pressure Bt of barometric pressure, just along with the closing operation to above-mentioned air throttle 23 begins to reduce with the scheduled time difference at above-mentioned steps S22.

And, the target generation current Ge of alternator 28 is set at the initial value that preestablishes into about 60A, begin to make the Generation Control (step S27) of alternator 28 runnings.In addition, also can reach and be set at for example the reference speed N2 about 760rpm or the following moment at the top dead center rotational speed ne that is judged to be motor, air throttle 23 is in closes the valve state, begin the Generation Control of alternator 28 simultaneously, substituting and being judged to be engine rotary speed Ne at above-mentioned steps S25 is the above-mentioned mode of execution that reference speed N2 or following moment t2 are in air throttle 23 to close the valve state.

Next, whether the top dead center rotational speed ne of judgement motor is in first predetermined range (step S28).This first predetermined range, in the process that reduces along predefined reference line at engine rotary speed Ne, numerical value according to the top dead center rotational speed ne of the moment t3 that reaches the 4th compression top center before the halted state by for example motor sets is set in 480rpm ~ 540rpm scope specifically.

Above-mentioned steps S28 is judged to be certainly, the top dead center rotational speed ne that confirms as motor is in above-mentioned first predetermined range, and (occasion in the 480rpm ~ 540rpm) is set and this target generation current Ge (step S29) of the corresponding alternator 28 of top dead center rotational speed ne of t3 constantly.Specifically, as shown in figure 11, from the big more conversion figure of the numerical value of the high more target generation current of the above-mentioned dead point rotational speed ne Ge that is set at motor, read and the corresponding target generation current of top dead center rotational speed ne Ge, carry out the target generation current Ge that makes alternator 28 according to this numerical value and drop to the control of the numerical value of from above-mentioned conversion figure, reading from above-mentioned initial value (60A).

Next, whether whether the top dead center rotational speed ne that judges motor is in second predetermined range that sets according to the top dead center rotational speed ne that stops the moment t4 of preceding the 2nd compression top center by motor, for example be in 260rpm ~ 400rpm scope (step S30).Be judged to be certainly, confirmed to pass through the moment t4 that motor stops preceding the 2nd compression top center at this step S30, according to being set at the engine tope center rotational speed ne big more outer conversion figure of diagram of value of high fuel injection amount more, the cylinder 12C that is in compression stroke when stopping at motor sets fuel injection amount, carries out fuel at the compression stroke latter half part of this cylinder 12C and sprays (step S31).Temperature is lowered the temperature with the vaporization that is ejected into the fuel in this cylinder 12C in the cylinder, thereby can suppress the rising of its internal pressure.

Next, whether the top dead center rotational speed ne of judgement motor is specified value N3 or following (step S32).This specified value N3 is and the corresponding numerical value of top dead center rotational speed ne when the rotational speed Ne of motor surmounts last compression top center in the process that predefined reference line reduces, can be set at for example about 260rpm.And, also can detect each cylinder 12A ~ 12C successively by each boost pressure Bt constantly of compression top center, can store this numerical value.

Above-mentioned steps S32 is judged to be certainly, the top dead center rotational speed ne that confirms as motor be afore mentioned rules value N3 or following, promptly confirmed the occasion of motor by last compression top center, boost pressure Bt when this moment t5 reads by its preceding 1 compression top center sets this numerical value stops preceding the 2nd compression top center (TDC) as motor boost pressure Bt (step S33).

Then, enter the top dead center rotational speed ne (below be called final top dead center rotational speed ne1) of the moment t5 of last compression top center and the boost pressure Bt that motor stops preceding the 2nd compression top center (below be called boost pressure Bt2) according to motor, judge whether piston 13 has the trend (step S34) of the position (being in the position near lower dead center among the expansion stroke cylinder 12A) that stops near each stroke later stage.Specifically, final top dead center rotational speed ne1 is authorized pressure P2 (for example P2=-200mmHg) or when following (for inlet side time) for regulation rotational speed N4 (for example N4=200rpm) or above and above-mentioned boost pressure Bt2, the possibility that stops at above-mentioned position near the stroke later stage is very big, that is to say, the piston stop position of expansion stroke cylinder 12A, proper range R with respect to 100 ° ~ 120 ° of CA after the compression top center, the possibility that stops at close 120 ° of CA positions is very big, thereby above-mentioned steps S34 is judged to be certainly.

Above-mentioned steps S34 is judged to be negative occasion, motor stops at as mentioned above near the trend of stroke later positions and not obvious, and might stop at relatively near the stroke position in early stage, that is to say that the piston stop position of expansion stroke cylinder 12A might stop at position or 100 ° of positions that CA is following of close 100 ° of CA with respect to the proper range R of 100 ° ~ 120 ° of CA after the compression top center.Therefore, stop in the above-mentioned proper range R, air throttle 23 is carried out open operation in order to make piston 13 more reliably.Make the aperture K of air throttle 23 for example become to be set at and about 40% the first aperture K1 (step S35) of standard-sized sheet inspiratory flow is strengthened by making air throttle 23 drive valve, reduce the inhalation resistance of suction stroke cylinder 12D.Therefore, motor is easy to stop at the position near the stroke later stage, and the result is that the stop position that can prevent piston 13 among the expansion stroke cylinder 12A surpasses the interior lower limit (100 ° of CA) of proper range R.

And be judged to be sure occasion at above-mentioned steps S34, the rotatory inertia of motor is big, and the inspiratory flow to the final suction stroke of compression stroke cylinder 12C is little, its compression opposition is in less state, stops at condition near the stroke later positions easily thereby satisfied piston 13.Therefore, operation air throttle 23 makes the aperture K of air throttle 23 reach and is set at for example about 5% the second aperture K2 (step S36).The above-mentioned second aperture K2 also can reach littler aperture or closed condition according to characteristic of motor etc.So just, suction stroke cylinder 12D is produced the inhalation resistance of appropriateness, can prevent effectively that the stop position of piston 13 from surpassing above-mentioned proper range R and the situation generation of more close later stage one side.

Next, judge whether motor is in halted state (step S37), be judged to be the sure moment, automatic speed variator is being returned to driving condition (step S38) from neutral state, and be that invalid back (step S39) stops the control running making automatic suspension of licence sign F.

Control running when the motor that becomes automatic stop condition as mentioned above being reset according to the flow chart of Figure 12 ~ shown in Figure 14 and Figure 15 and sequential chart explanation shown in Figure 16.

At first, judge whether the motor restart condition of regulation sets up (step S101), be judged to be sure occasion, for example carry out throttle operation etc. and be used for the occasion that begins to start to walk from vehicle stop state, the occasion that cell voltage reduces, or air-conditioning work occasion etc., according to engine water temperature, the elapsed-time standards after stopping, inhalation temperature etc. are inferred cylinder temperature (step S102) automatically.

Then, the stop position of detected piston 13 when stopping automatically according to motor is calculated the air quantity (step S103) in compression stroke cylinder 12C and the expansion stroke cylinder 12A.Specifically, try to achieve the combustion chamber volume of compression stroke cylinder 12C and expansion stroke cylinder 12A according to the stop position of above-mentioned piston 13, and, when motor stops automatically, fuel sprays and to stop that rear engine just stops after through rotation for several times thereby expansion stroke cylinder 12A is in and is full of new air state, and motor when stopping compression stroke cylinder 12C and the inside of expansion stroke cylinder 12A be essentially barometric pressure, thereby can try to achieve new air quantity according to above-mentioned combustion chamber volume.

Next, judge whether the detected piston stop position of output signal according to above-mentioned crankshaft angle sensor 30,31 is near the lower dead center BDC (step S104) in the middle of the suitable stop position R (BTDC60 ° ~ 80 ° CA before the top dead center) in the compression stroke cylinder 12.Be judged to be certainly at this step S104, confirmed the more relatively occasion of air quantity in the compression stroke cylinder 12C, the air quantity of the compression stroke cylinder 12C that calculates at above-mentioned steps S103 is carried out the 1st fuel and is sprayed so that become the air fuel ratio (for example air fuel ratio=20 sizes) (step S105) of λ (excess air ratio)＞1.This air fuel ratio can be tried to achieve according to the 1st time first air fuel ratio conversion figure M1 of the compression stroke cylinder 12C that sets with the stop position of piston 13 in advance, is set at the phase air fuel ratio of λ＞1.Thus, even if air quantity more also can prevent to reverse the too much situation of required burning energy relatively in the compression stroke cylinder 12C.

And be judged to be negative at above-mentioned steps S104, air quantity is carried out the 1st fuel at the air quantity of the compression stroke cylinder 12C that calculates among the above-mentioned steps S103 and is sprayed so that become the air fuel ratio (step S106) of λ≤1 relatively more after a little while in the compression stroke cylinder 12C.This air fuel ratio, can try to achieve according to the 1st time second air fuel ratio conversion figure M2 of the compression stroke cylinder 12C that sets with the stop position of piston 13 in advance, by being set at λ≤1 (stoichiometric air/or dense combustion air fuel ratio), even if air quantity more also can fully obtain to reverse used burning energy in the compression stroke cylinder 12C.

Next, the 1st fuel of compression stroke cylinder 12C is sprayed, after consideration after the stipulated time that vaporization time sets, this cylinder 12C light a fire (step S107).Then, according to the edge that whether detects crankshaft angle sensor 30,31 in the set time after igniting, be the rising edge edge or the trailing edge edge of crank shaft angle signal, judge whether piston 13 has carried out moving (step S108), be judged to be negative, confirm as the occasion that causes piston 13 to move as yet because of misfiring, to compression stroke cylinder 12C light a fire once again (step S109).

Above-mentioned steps S108 is judged to be certainly, the words that piston 13 has moved have been confirmed, just the cylinder temperature of being inferred according to piston stop position and above-mentioned steps S102 is calculated the ration of division that the gradation fuel at expansion stroke cylinder 12A sprays (the 1st time leading portion sprays and the ratio of the 2nd time back segment injection) (step S121).The injection proportion of above-mentioned back segment is set at, the close lower dead center of piston stop position among the expansion stroke cylinder 12A, and also cylinder temperature is high more, and set definite value is big more.

Next, the air quantity of the expansion stroke cylinder 12A that above-mentioned steps S103 is calculated is calculated fuel injection amount so that reach regulation air fuel ratio (λ≤1) (step S122).The air fuel ratio of this moment can be tried to achieve from the air fuel ratio conversion figure M3 according to the predefined expansion stroke cylinder of the stop position of piston 13 12A.And, according to the ration of division that fuel injection amount and the step S121 to the expansion stroke cylinder 12A that are calculated by step S122 calculate, calculate leading portion (the 1st time) fuel injection amount, and sprayed (step S123) at expansion stroke cylinder 12A.

Then, according to the cylinder temperature that above-mentioned steps S102 infers, calculate back segment (the 2nd time) fuel injection time (step S124) at expansion stroke cylinder 12A.The 2nd discharge time, for piston 13 beginnings are moved the time that air is compressed in (motor reverse) exhaust casing towards top dead center, the latent heat of vaporization that is set to burner oil effectively reduces compression pressure, promptly be set at and make piston 13 approach top dead center, and the time that is set at the 2nd time burner oil was vaporized before firing time is long as far as possible.

Next, the ration of division that fuel injection amount and the step S121 to expansion stroke cylinder 12A that calculates according to step S122 calculates, calculate back segment (the 2nd time) fuel injection amount (step S125), in the 2nd discharge time that above-mentioned steps S124 calculates, spray (step S126) at expansion stroke cylinder 12A.

After the 2nd the fuel injection to above-mentioned expansion stroke cylinder 12A, at light a fire through the moment of stipulating retard time (step S127).This retard time, can try to achieve from igniting conversion figure M4 according to the predefined expansion stroke cylinder of the stop position of piston 13 12A.The primary combustion of the expansion stroke cylinder 12A that forms along with above-mentioned igniting, motor just changes into from reverse and changes.So the piston 13 of compression stroke cylinder 12C moves to top dead center one side, make gas in the cylinder (burnt gas that burns by above-mentioned steps S107 igniting) begin compression.

Then, consider the vaporization time of fuel, compression stroke cylinder 12C is sprayed the 2nd fuel (step S128).The fuel injection amount of this moment, for make according to and the overall air fuel ratio of the emitted dose that adds up to of the 1st emitted dose be richer than further that ((for example being about 6) inflammable air fuel ratio (being limited to 7 ~ 8 down) can be tried to achieve from the 2nd air fuel ratio conversion figure M5 corresponding to the predefined compression stroke cylinder of the stop position of piston 13 12C.Because of the corresponding reduction of the latent heat of vaporization that the 2nd time burner oil produced among this compression stroke cylinder 12C, can be easy to cross this compression top center by near the compression pressure the compression top center that makes compression stroke cylinder 12C.

In addition, the 2nd fuel of above-mentioned compression stroke cylinder 12C sprayed be specially in order to reduce compression pressure in the cylinder, it is not lighted a fire, burns, because it is also denseer than inflammable air fuel ratio, thereby can not cause spontaneous combustion, this unburned fuel reacts with the oxygen of the adsorbed storage of exhausting air cleaning catalyst of exhaust passageway 22 subsequently, and reaches harmless.

Fuel and the unburned that the 2nd time is sprayed among the compression stroke cylinder 12C as mentioned above, thereby the follow-up burning next time of the initial combustion of expansion stroke cylinder 12A as shown in figure 16, just becomes the initial combustion that is in the 4th cylinder of suction stroke when suction stroke cylinder 12D promptly stops.Part among the expansion stroke cylinder 12A in the primary combustion energy can be replenished as the piston 13 of this suction stroke cylinder 12D and be crossed the used energy of compression top center, and the primary combustion energy among the above-mentioned expansion stroke cylinder 12A can be provided for compression stroke cylinder 12C and surmount the purposes that compression top center and suction stroke cylinder 12D cross this two aspect of compression top center.

So, to wish that suction stroke cylinder 12D crosses the used energy of compression top center little for smooth starting, therefore infer the air density in the said cylinder 12D, calculate according to this presumed value (step S140) after the air quantity of suction stroke cylinder 12D, according to the cylinder temperature that above-mentioned steps S102 is inferred, calculate in order to prevent the air fuel ratio correction value (step S141) of spontaneous combustion.Specifically,, just arrive before the compression top center the active force (opposing torque) of piston 13 back-pressures, correspondingly cross the used energy of compression top center and too much consume, thereby be undesirable to lower dead center one side because of this burning occurs in case cause spontaneous combustion.Therefore,, need manage air fuel ratio is adapted to a rare side, avoid causing compression autoignition in order to suppress above-mentioned opposing torque.

Next, the air quantity of the suction stroke cylinder 12D that calculates according to above-mentioned steps S140 and considered the air fuel ratio of the air fuel ratio correction value that above-mentioned steps S141 calculates is calculated the fuel injection amount (step S142) to suction stroke cylinder 12D.And, above-mentioned suction stroke cylinder 12D is carried out fuel to be sprayed, but this fuel injection retardation is to the later stage (step S143) of compression stroke, so that this latent heat of vaporization can reduce compression pressure, that is to say and to reduce in order to crossing the required energy of compression top center that its retardation can be calculated according to the automatic stopping period of motor, inhalation temperature, engine water temperature etc.

And, will be deferred to top dead center firing time and light a fire later on, (step S144) takes place to suppress above-mentioned opposing torque.By carrying out above control, thereby the compression pressure of suction stroke cylinder 12D before compression top center reduces to be not easy to cross top dead center, and crossed moment of top dead center just produces positive veer because of burning energy torque.

Behind the above-mentioned steps S144, also can carry out the transition to common state of a control, but also suppress the control that engine rotary speed rises sharply in the present embodiment.Rising sharply of said engine rotary speed, the later engine rotary speed of primary combustion that is meant suction stroke cylinder 12D just sharply is elevated to more than the required speed, be acceleration shock to take place or bring the reason place of uncomfortable sensation, thereby do not wish to take place to the driver.Rising sharply of above-mentioned engine rotary speed, because automatically the pressure of inspiration(Pi) (pressure in air throttle 23 downstreams) in the stopping period is essentially barometric pressure, because the burning energy of burning energy during temporarily greater than common idle running of mobilizing back moment (after the primary combustion of suction stroke cylinder 12D) each cylinder 12A ~ 12D taken place.Therefore, following step S145 ~ S158 suppresses the control that above-mentioned engine rotary speed rises sharply.

At first, the target current value of alternator 28 is set at than common height begins generating (step S145), by the generating of this alternator 28 rotational resistance (external loading of motor) of bent axle 3 is strengthened and suppress rising sharply of engine rotary speed.

Next, judge that pressure of inspiration(Pi) that inspiratory pressure sensor 26 detects is whether than not carrying out the pressure of inspiration(Pi) height (step S150) of motor when stopping the common idling of situation automatically, be judged to be sure words, just reach the state that causes engine rotary speed to rise sharply easily, thereby the air throttle aperture also little (step S151) when making the common idle running of opening ratio of air throttle 23, suppress the generating capacity of burning energy.

Then, whether the temperature of judging the exhausting air cleaning catalyst that is provided with in the exhaust passageway 22 is active temperature or following (step S152), be judged to be sure occasion, target air-fuel ratio in the cylinder is set at the dense combustion air fuel ratio (step S153) of λ≤1, makes simultaneously and be deferred to (step S154) after the top dead center firing time.Thus, promote above-mentioned catalyst temperature to raise, suppress the generating capacity of burning energy simultaneously by the delay of firing time.

And that above-mentioned steps S152 is judged to be is negative, confirms as the occasion that exhausting air cleaning catalyst temperature is higher than active temperature, and the target air-fuel ratio in the cylinder is set at the phase air fuel ratio of λ＞1, becomes the rare combustion regime of layering (step S158).Thereby can suppress fuel consumption by this phase, and suppress the generating capacity of burning energy.

Return step S150 through after above-mentioned steps S154 or the step S158, repeat above-mentioned control running and be judged to be negatively up to this step S150, confirm as pressure of inspiration(Pi) and be lower than and do not carry out till the pressure of inspiration(Pi) of motor when stopping the common idling of situation automatically.This step S150 is judged to be negative, just no longer rising sharply of engine rotary speed may be taken place, and the generation current that comprises alternator 28 is in the interior common state of a control (step S160) that carries out the transition to.

By carrying out the above-mentioned control of restarting, as Figure 15 and shown in Figure 16, at first in compression stroke cylinder 12C (the 3rd cylinder), carry out the 1st fuel and spray J3, by this igniting burn (among Figure 15 (1)).The firing pressure that the piston 13 of compression stroke cylinder 12C is produced by this burning (1) (a part among Figure 16) is pressed down to lower dead center one side, drives motor on reverse direction.Here, the 1st fuel of compression stroke cylinder 12C sprays J3, in relative air quantity is rare air fuel ratio (λ＞1) more for a long time, and be stoichiometric air/or the dense air fuel ratio of enriching (λ≤1) more after a little while, thereby can obtain the used appropriate burning energy of motor reverse, specifically, the abundant air in the compression-expansion stroke cylinder 12A, and be avoided above compression top center and the burning energy that excessively reverses.

The beginning that the piston 13 of expansion stroke cylinder 12A (the 1st cylinder) reverses along with above-mentioned motor, beginning is moved towards the top dead center direction.And after this moment is promptly carried out (leading portion) fuel injection J1 the 1st time to expansion stroke cylinder 12A, begins vaporization.Then, the piston 13 of expansion stroke cylinder 12A moves to top dead center one side (comparatively it is desirable to the more close top dead center than stroke central authorities), and the moment that air is compressed in said cylinder 12A carries out the 2nd (back segment) fuel and sprays J2.Compression pressure is reduced by the latent heat of vaporization of this burner oil, and piston 13 more approaches top dead center, thereby pressurized air (mixed gas) increase in density (b part among Figure 16).

The piston 13 of above-mentioned expansion stroke cylinder 12A fully approaches the moment of top dead center this cylinder 12A is lighted a fire, both all burn the 1st burner oil (J1) that vaporization obtains promoting and the 2nd burner oil (J2) (among Figure 15 (2)), can drive motor on positive veer by firing pressure (c part among Figure 16).

And, by compression stroke cylinder 12C being sprayed the fuel (among Figure 15 (3)) that (J4) is richer than the inflammable air fuel ratio with appropriate time, though unburned among this compression stroke cylinder 12C, but spray the compression pressure (d part among Figure 16) that the latent heat of vaporization produced can reduce above-mentioned compression stroke cylinder 12C by fuel, can reduce thereupon in order to surmount the initial combustion energy of the expansion stroke cylinder 12A that this compression top center (the initial compression top dead center after beginning to start) consumed.

In addition, because with next combustion cylinder is fuel sprays (J5) among the suction stroke cylinder 12D time set for the latent heat of vaporization by fuel makes the appropriate time that temperature in the cylinder and compression pressure reduce (for example being depicted as compression stroke after mid-term as (4) among Figure 15), so can prevent compression stroke spontaneous combustion before compression top center of above-mentioned suction stroke cylinder 12D.And, also be set at the later situation of compression top center and combine with firing time with above-mentioned suction stroke cylinder 12D, prevent the burning (e part among Figure 16) before the compression top center.Specifically, can spray by fuel (J5) compression pressure is reduced and compression top center before do not burn, come that the primary combustion energy is consumed (from the engine start compression top center zero hour the 2nd) among the repression of swelling stroke cylinder 12A in order to surmount above-mentioned compression top center.

Like this, just can utilize the energy of the primary combustion (among Figure 15 (2)) among the expansion stroke cylinder 12A, surmount initial compression top dead center (among Figure 15 (3)) and the 2nd compression top center (among Figure 15 (4)) reset after the beginning, can guarantee reliable starting performance smoothly, after this ((5), (6) among Figure 15 ...) by with catalyst temperature with air fuel ratio be set at phase (λ＞1) or post ignition time when preventing to rise sharply transition be running usually.

In sum, comprise for fuel injection control system (being comprised by ECU2 in the above-mentioned mode of execution) from fuel injection time to the Fuelinjection nozzle 16 of each cylinder 12A ~ 12D direct fuel injection that control fuel injection amounts and; To the ignition control device of controlling the firing time of the spark plug 15 of setting in each cylinder 12A ~ 12D (being comprised by ECU2 in the above-mentioned mode of execution); By engine-driving and the target generation current Ge that generation current is reached set and the alternator 28 that operates; And the starting arrangement of the motor of the rotary speed detecting device of detection of engine rotational speed Ne (playing the crankshaft angle sensor 30,31 of rotation speed sensor function), comprise when the automatic stop condition of predefined motor is set up by stopping to make the fuel injection from Fuelinjection nozzle 16 of motor continuous running make the self-braking automatic stop control of motor (being comprised by ECU2 as stopping control device automatically in the above-mentioned mode of execution); And when the restart condition of the motor that is in automatic stop condition is set up by 16 pairs of Fuelinjection nozzles self-braking cylinder injection fuel in expansion stroke 12A at least, burn by spark plug 15 igniting, the automatic start-control device (being comprised by ECU2 as stopping control device automatically in the above-mentioned mode of execution) that motor is reset, above-mentioned automatic stop control, (for example above-mentioned mode of execution when motor is stopped automatically, after the fuel injection stops moment t1, engine rotary speed Ne is near the moment t2 in the zone that is higher than common idling rotational speed (for example 650rpm) or its), the target generation current Ge of alternator 28 is set at the initial value that preestablishes into higher value, (for example above-mentioned mode of execution then, be in and fully detect fuel injection stopping rear engine rotational speed Ne reduction degree, and can give full play near the moment t3 of rotational velocity range of alternator 28 electricity generate functions or its), set the slippage of above-mentioned target generation current corresponding to the engine rotary speed reduction state that fuel injection stopping back being produced with respect to above-mentioned initial value, thereby can be rapidly and correctly carry out the control of regulating the rotational resistance of bent axle 3 corresponding to engine rotary speed Ne reduction state, the piston 13 that can make motor stop constantly to be in the cylinder 12A of expansion stroke more reliably stops at and is fit in the scope R that motor resets.

Specifically, above-mentioned alternator 28 is by being adjusted to for example arbitrary value about 0A to 60A with target generation current Ge, can correctly regulate the rotational resistance of bent axle 3 at relative broad range, and as shown in figure 17 as can be known, target generation current Ge is set at the occasion that the big current value about 60A raises generation current from for example little current value about 10A, needs about 0.1 second time.Otherwise, the target generation current Ge of alternator 28 is set at the occasion that the little current value about 10A descends generation current from for example big current value about 60A, can make the generation current transient change.

So, at the above-mentioned motor self-braking running initial stage, the target generation current Ge of alternator 28 is set at fixing higher value (initial value), after reaching the state of the electricity generate function that can give full play to alternator 28, the top dead center rotational speed ne of the motor in the time of can fully detecting piston 13 by compression top center reduces state, be in the time of the engine rotary speed Ne scope that can give full play to alternator 28 electricity generate functions in addition, by setting the slippage of above-mentioned target generation current Ge with respect to above-mentioned initial value corresponding to this top dead center rotational speed ne reduction state, can reduce state corresponding to engine rotary speed Ne and carry out the control of regulating bent axle 3 rotational resistances rapidly and correctly, the piston 13 that therefore can make motor stop constantly to be in the cylinder 12A of expansion stroke stops at more reliably and is fit to the position that motor is reset.

In addition, also the crank shaft angle in piston 13 moment by the stroke middle position etc. can be set at detection angles, according to the slippage of detected engine rotary speed Ne target setting generation current Ge of the moment that becomes this detection angles, substitute the top dead center rotational speed ne of motor when detecting piston 13, the while is controlled above-mentioned target generation current Ge slippage according to this top dead center rotational speed ne above-mentioned mode of execution by compression top center.But piston 13 is by the moment of stroke middle position, be in the state of the obvious change of rotational speed Ne of motor, the reduction state that is difficult to correct decision engine rotary speed Ne, thereby, comparatively it is desirable to as above-mentioned mode of execution, the top dead center rotational speed ne of the motor of the piston 13 that temporarily is in steady state according to engine rotary speed Ne during by compression top center sets the slippage of the target generation current Ge of alternator 28.

In the above-described embodiment, when motor is stopped automatically, the rotational speed Ne of motor reaches predefined reference speed N2 and after fuel being sprayed stop, the experience stipulated time, confirmed that for example the piston 13 of a certain cylinder enters the moment t3 that motor stops preceding the 4th to the 6th compression top center, detect top dead center rotational speed ne, from conversion figure shown in Figure 11, read simultaneously and the corresponding target generation current of this top dead center rotational speed ne Ge, the slippage of the target generation current Ge of alternator 28 is set at, at the numerical value of the lower occasion of above-mentioned top dead center rotational speed ne numerical value greater than higher occasion, thereby can be along predefined reference line with suitably control and engine rotary speed Ne is reduced of the target generation current Ge of alternator 28.Like this, regulate the target generation current Ge of alternator 28 and enter in the scope shown in Fig. 6 hacures by reach the 4th top dead center rotational speed ne before the halted state according to motor so that motor reaches the 2nd top dead center rotational speed ne before the halted state etc., the rotational resistance of motor is changed, and the piston 13 that can make motor stop constantly to be in the cylinder of expansion stroke stops at and is fit to the position that motor is reset.

Be fit to the position that motor is reset for the piston 13 that motor is stopped constantly to be in the cylinder 12A of expansion stroke stops at, the generation current that comparatively it is desirable to the above-mentioned alternator 28 of control before motor reaches halted state is regulated the rotational resistance of bent axle 3.But motor reaches before the halted state, engine rotary speed Ne is lower and can't give full play to the electricity generate function of above-mentioned alternator 28, even if target generation current Ge is changed, the rotational resistance of bent axle 3 is obviously changed, thereby be difficult to correctly regulate the reduction state of engine rotary speed Ne.Therefore, for the piston 13 that above-mentioned motor is stopped constantly to be in the cylinder 12A of expansion stroke stops at the appropriate location, comparatively it is desirable to after the fuel injection stops, making the target generation current Ge rising of alternator 28 to be above-mentioned initial value, and reduce the mid-term stage (a certain cylinder enters the moment that motor stops preceding the 4th ~ the 6th compression top center) of process at engine rotary speed Ne, then make the target generation current Ge of alternator 28 be reduced to the corresponding numerical value of reduction situation with engine rotary speed.

And, shown in above-mentioned mode of execution, make the self-braking running initial stage of motor, the aperture K of air throttle 23 is set at about 30%, after fully guaranteeing to import to the inspiratory flow in cylinder 12A ~ 12D, with the stipulated time target generation current Ge of alternator 28 is raise and be the occasion of predefined initial value, can be at the sufficiently high initial stage that decommissions automatically of engine rotary speed Ne, by reducing air-breathing amount of restriction, the air-breathing of q.s imported in cylinder 12A ~ 12D, improve the scavenging performance of each cylinder 12A ~ 12D effectively, and after the suction power loss reduction, by rapidly and the electricity generate function of giving full play to alternator 28 suitably regulate the rotational resistance of bent axle 3, can more suitably carry out making motor stop the control that piston 13 that the moment is in the cylinder of expansion stroke stops at the position that suitable motor resets.

Especially in the above-described embodiment, make the self-braking running of the motor initial stage, promptly in the sufficiently high zone of engine rotary speed Ne, fully guarantee to import to the interior inspiratory flow of cylinder 12A ~ 12D by reducing air-breathing amount of restriction, and meanwhile the target generation current Ge of alternator 28 is set at 0 etc., this target generation current Ge is temporarily descended, thereby the scavenging performance of each cylinder 12A ~ 12D is effectively improved, and can reduce the rotational resistance and the suction power loss of bent axle 3 simultaneously.So, at the initial stage that makes the self-braking running of motor, can prevent that engine speed Ne from obviously reducing, can raise by the target generation current Ge that makes alternator 28 in the stipulated time after this simultaneously and be initial value, come to bring into play rapidly and fully the electricity generate function of alternator 28, the external loading of motor is adjusted to appropriate value.

In addition, in the above-mentioned mode of execution, above-mentioned automatic stop control, make the self-braking running of the motor initial stage, be that the fuel injection stops the rotational speed Ne of rear engine than the lower moment t2 of reference speed N2 that is redefined for about 760rpm, reduce inspiratory flow by the aperture K that reduces above-mentioned air throttle 23, make the target generation current Ge of alternator 28 add greatly initial value simultaneously, thereby, can between in due course, close above-mentioned air throttle 23, motor is stopped constantly being in the air quantity that is imported in the cylinder 12A of expansion stroke to be adjusted to bigger than the cylinder 12C that is in compression stroke, and can be by effectively bring into play the electricity generate function of above-mentioned alternator 28 with appropriate time, the piston 13 of above-mentioned expansion stroke cylinder 12A is stopped at be fit in the scope R that motor resets, promptly stop at stroke central authorities slightly near the position of lower dead center one side.

And, shown in above-mentioned mode of execution, make the self-braking running of the motor initial stage, automatic speed variator is under the state that neutral state suppresses the engine rotary speed Ne change that external disturbance causes, stop fuel and spray the occasion that engine rotary speed Ne is reduced, can suitably carry out piston 13 is stopped at be fit to position that motor resets stop control automatically.

And, in the above-described embodiment, common idling rotational speed when motor will be stopped automatically is set in the motor of 650rpm (automatic speed variator is a driving condition), reach the numerical value higher, moment t2 about for example 860rpm at target rotational speed (automatic speed variator the is set at neutral state) N1 of motor and fuel is sprayed stop, can guaranteeing fully that fuel sprays and stop t1 constantly and be in the engine revolution of halted state during this (number of strokes may of air-breathing, compression, expansion, exhaust) to motor than above-mentioned common idling rotational speed.Thereby, can reduce by make engine rotary speed Ne along predefined reference line, and the target generation current Ge of the above-mentioned alternator 28 of control regulates the rotational resistance of bent axle 3 in this process, can suitably carry out piston 13 to be stopped at be fit to stop control automatically in the scope R that motor resets.

In addition, in the above-described embodiment, the moment t0 that sets up at the automatic stop condition of motor, the target rotational speed N1 of motor is set at the numerical value that is higher than above-mentioned common idling rotational speed, carry out the feedback control of engine rotary speed Ne, and the inspiratory flow controlling device of being made up of above-mentioned air throttle 23 in control makes under the engine operating status stable status so that intake negative-pressure Bt reaches the numerical value that immobilizes, fuel is sprayed stop, thereby can more suitably carry out the motor that engine rotary speed Ne is reduced along predefined reference line and stop control automatically.

And, in the above-described embodiment, enter the top dead center rotational speed ne1 of the moment t5 of last compression top center according to piston 13, judge whether piston 13 has the trend of stroke by the position of second half section that stops at, regulate the aperture K of air throttle 23 according to this result of determination, thereby can suitably regulate motor stop before the path increment of piston 13, suitably carries out making piston 13 stop at interior the stopping automatically of scope R that suitable motor resets to control.

Whether according to for example satisfying finally top dead center rotational speed ne1 is that 200rpm or above and above-mentioned boost pressure Bt2 are P2=-200mmHg or following condition, judge whether piston 13 has the trend that stops near the position of stroke second half section, be judged to be negative occasion, be set at first aperture that preestablishes into about 40% by aperture K with air throttle 23, the inhalation resistance of suction stroke cylinder 12D is reduced, can prevent effectively that the position of the piston 13 of expansion stroke cylinder 12A from reaching the situation of the state that exceeds proper range R lower limit.And above-mentioned result of determination is sure occasion, can be set at second aperture about 5% by aperture K with air throttle 23, generate appropriate inhalation resistance by suction stroke cylinder 12D, prevent that the stop position of piston 13 from exceeding the situation that above-mentioned proper range R also further reaches back segment one side.

In addition, the inspiratory flow controlling device that the air throttle 23 that the upstream side by compensator 21b of above-mentioned mode of execution explanation disposes is formed is regulated the example for the inspiratory flow of each cylinder 12A ~ 12D, but be not limited thereto, the also known variable valve actuator for air that can change by the lifting capacity that is provided with the Aspirating valves 19 that is provided with among each cylinder 12A ~ 12D, regulate the inspiratory flow for above-mentioned each cylinder 12A ~ 12D, the how logical type air throttle that perhaps disposes valve body on the air suction way 21a of branch that also can be connected with each cylinder 12A ~ 12D is separately regulated the inspiratory flow for above-mentioned each cylinder 12A ~ 12D.

In addition, in the above-mentioned mode of execution, be lower than the moment t2 that is redefined for the reference speed N2 about 760rpm after the fuel injection stops at the rotational speed Ne of motor, the running that running that the aperture K of air throttle 23 reduces and the target generation current Ge that makes alternator 28 are strengthened, but the moment that not necessarily needs both to operate coincide, and the increasing time of the target generation current Ge of alternator 28 is staggered front and back slightly with respect to the moment t2 that air throttle 23 apertures are reduced.

And, in the mode of execution of the starting arrangement of above-mentioned motor, be when the motor that is in automatic stop condition is reset, by compression stroke cylinder 12C being carried out the 1st burning, make bent axle 3 only reverse a little at first, again the mixed gas in the expansion stroke cylinder 12A is compressed back igniting, but the starting arrangement of motor of the present invention is not limited thereto, also can motor reset by just expansion stroke cylinder 12A being lighted a fire at first

In addition, above-mentioned mode of execution is that motor sprays the used fuel of primary combustion in expansion stroke cylinder 12A when resetting and takes gradation to spray (J1+J2), but also can determine to satisfy simultaneously the latent heat of vaporization to the reduction of compression pressure with the time (specified fuels discharge time) of the performance of guaranteeing to vaporize, spray as 1 fuel of this specified fuels discharge time by test etc.And, when motor is reset, be used among the expansion stroke cylinder 12A gradation fuel that initial combustion carries out spray also can be divided into as required 3 times or more than.

In addition, although done omission in the above-mentioned mode of execution, but when motor is reset, when rated condition is set up, for example piston stop position is not in stipulated time after the occasion that suitably stops in the scope R or the starting, engine rotary speed does not reach specified value etc., can follow the auxiliary control of starting motor yet.

Utilize possibility on the industry

By above explanation as can be known, the starting device of engine of the present invention comprises for to each cylinder direct fuel injection Fuelinjection nozzle is controlled the fuel injection control system of its fuel injection amount and fuel injection time; Spark to each cylinder setting The ignition control device that control the duration of ignition of plug; By motor driven and the target that generation current is reached set send out Electricity electric current and the alternating current generator that operates; And the engine that detects the rotary speed detecting device of engine rotary speed Starting device, the starting device of this engine comprises: when predefined engine automatic stop condition is set up, by The fuel from Fuelinjection nozzle that stops to make the engine continuous running spray and make engine automatic stop automatically stop control Device processed; And when the restart condition of the engine that is in automatic stop condition is set up, by Fuelinjection nozzle to existing at least Self-braking cylinder injection fuel is burnt by plug ignition in the expansion stroke, make that engine resets automatically Start-control device, above-mentioned automatic stop control when making engine automatic stop, is sent out the target of alternating current generator The electricity current settings is the initial value that preestablishes into higher value, stops the rear engine that produces corresponding to the fuel injection then and revolves Rotary speed reduction state is set above-mentioned target generation current with respect to the slippage of above-mentioned initial value, thereby can be rapidly and just Really carry out the control of regulating the rotational resistance of bent axle corresponding to engine rotary speed reduction state, can make more reliably Piston stops at the appropriate location, improves the performance of restarting of engine.

Claims (10)

1. the starting arrangement of a motor,

Described motor comprises:

For fuel injection control system from fuel injection time to the Fuelinjection nozzle of each cylinder direct fuel injection that control its fuel injection amount and;

To the ignition control device of controlling the firing time of the spark plug that is provided with on described each cylinder;

By engine-driving, and the target generation current that generation current is reached set and the alternator that operates; And

The rotary speed detecting device of detection of engine rotational speed,

The starting arrangement of this motor is characterized in that comprising:

When the automatic stop condition of predefined motor is set up, by stopping to make the fuel injection from described Fuelinjection nozzle of motor continuous running make the self-braking automatic stop control of motor; And

When the restart condition of the motor that is in automatic stop condition is set up, by described Fuelinjection nozzle to self-braking cylinder injection fuel in expansion stroke at least, burn the automatic start-control device that motor is reset by described plug ignition

Described automatic stop control, when motor is stopped automatically, the target generation current of alternator is set at the initial value that preestablishes into higher value, and the engine rotary speed decline state that is produced corresponding to fuel injection stopping back being set the slippage of described target generation current with respect to described initial value then.

2. the starting arrangement of motor as claimed in claim 1 is characterized in that,

Automatic stop control, the fuel that execution is stopped described Fuelinjection nozzle sprays so that the self-braking engine rotary speed of motor is set at the numerical value that is higher than common idling rotational speed, spray simultaneously and be in when being higher than described common idling rotational speed regional when the detected engine rotary speed of described rotary speed detecting device after stopping at fuel, set the described initial value of the target generation current of described alternator, and when becoming described common idling rotational speed with lower area, set the slippage of described target generation current with respect to described initial value by the detected engine rotary speed of described rotary speed detecting device.

3. the starting arrangement of motor as claimed in claim 2 is characterized in that,

Described automatic stop control, with described alternator during the setting of the target generation current of described initial value decline established amount, be defined as till the 2nd compression top center before stopping through motor to any cylinder during.

4. the starting arrangement of motor as claimed in claim 2 is characterized in that,

Motor is 4 stroke engines that are in 180 ° of crank angle phase differences with one stroke,

Described automatic stop control in the moment that any cylinder passes through the 4th to the 6th compression top center before motor stops, being set the described slippage of described target generation current.

5. the starting arrangement of motor as claimed in claim 4 is characterized in that,

Described automatic stop control, top dead center rotational speed at motor is in the regulation rotational velocity range, according to the piston of any cylinder the moment, infer the moment of the 4th to the 6th compression top center before described any cylinder stops through motor by compression top center.

6. as the starting arrangement of claim 1 or 3 described motors, it is characterized in that,

Automatically stop control, behind the 2nd compression top center before cylinder stops through motor arbitrarily, after enter compression stroke second half section of the cylinder of compression stroke, by the injection of described Fuelinjection nozzle execution fuel.

7. the starting arrangement of motor as claimed in claim 6 is characterized in that,

Automatic stop control, according to passing through the moment of the 2nd compression top center before motor stops by the detected top dead center rotational speed of described rotary speed detecting device at any cylinder, the described compression stroke second half section is set by the fuel injection amount of described fuel injection valves inject, this top dead center rotational speed is high more, and the value that sets is big more.

8. the starting arrangement of motor as claimed in claim 2 is characterized in that,

Described motor comprises the inspiratory flow controlling device that the inspiratory flow that flow in the cylinder is regulated,

Described automatic stop control, when stop condition is set up automatically, the speed change state of automatic speed variator is switched to neutral state from driving condition, by described inspiratory flow regulating device the inspiratory flow that flow in the cylinder is added greatly greater than the inspiratory flow under the described common idling rotational speed state, under the engine rotary speed that is higher than described common idling rotational speed, carry out the fuel that stops described Fuelinjection nozzle then and spray, and set the described initial value of described target generation current.

9. the starting arrangement of motor as claimed in claim 1 or 2 is characterized in that,

Described automatic stop control, during motor after stopping the fuel injection decommissions, the crank shaft angle of motor reaches the moment of predefined detection angles, according to the detected engine rotary speed of described rotary speed detecting device, the slippage of described target generation current with respect to described initial value is set at, and the numerical value under the low situation of this engine rotary speed is greater than the numerical value under the higher situation.

10. the starting arrangement of motor as claimed in claim 9 is characterized in that,

Described automatic stop control, during motor after stopping the fuel injection decommissions, in the moment of piston, set the slippage of described target generation current with respect to described initial value according to the detected engine rotary speed of described rotary speed detecting device by compression top center.

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