CN100432409C - Device for controlling engine rotation stop by estimating kinetic energy and stop position - Google Patents

Abstract

A control apparatus for an engine increases an intake air quantity just before engine stop to increase a compression pressure in a compression stroke. As the compression pressure is increased, a negative torque in the compression stroke increases and obstructs engine rotation, and brakes the engine rotation. Thus, a range of crank angle, in which torque is below engine friction, that is, in which engine rotation can be stopped, is reduced. As a result, variation in engine rotation stop position is reduced to be within a small range of crank angle. Information of engine rotation stop position is stored, and the stored information of engine rotation stop position is used at the start of an engine to accurately determine an initial injection cylinder and an initial ignition cylinder to start the engine.

Description

Control the device that engine revolution stops by estimating kinetic energy and stop position

The application is for dividing an application, and its original application is the patent application of submitting to Patent Office of the People's Republic of China on January 30th, 2004, and application number is 200410003563.2, and denomination of invention is " controlling the device that engine revolution stops by estimating kinetic energy and stop position ".

Technical field

The present invention relates to a kind of device that engine revolution stops, estimating rotation stop position and estimating kinetic energy that is used to control.

Background technique

Usually, by determine cylinder and detect crankangle, be implemented in to carry out IGNITION CONTROL and fuel injection in the power operation according to the output signal of crank angle sensor and cam angle sensor.But motor begin to start up to starter ato unit and specific cylinder determine finish till, promptly detect till the predetermined crank angle signal of specific cylinder, we can not know the cylinder that is used for initial ignition/injection.

In order to address this problem, as disclosed content in the patent document 1 (JP-A-60-240875), crankangle (crankshaft stop position) when engine revolution is stopped is stored in the storage, and when next engine start, begin IGNITION CONTROL and fuel injection control according to being stored in engine revolution in the storage crankangle when stopping, till primary detection arrives the predetermined crank angle signal of specific cylinder, can improve startup quality and toxic emission when starting.

Close (switching to closed position) with after the fuel injection that stops to light a fire owing to switching in ignition switch, motor can utilize inertia to continue the rotation certain hour, therefore under the stored situation of crankangle when the closing operation of ignition switch, definite real engine rotation that can be wrong stops the crankangle that (when next engine start) located.Therefore, even under the situation that ignition switch has been closed, also need the power supply of retentive control system to be under the open mode so that continuation detects crankangle, till engine revolution stops fully.But because before engine revolution stops, the compression gas-pressure in the compression stroke causes the reverse this phenomenon of engine revolution (can not detect counterrotating), the crankangle in the time of can not accurately detecting engine revolution and stop.

And, as disclosed content in the patent document 2 (JP-A-11-107823), by estimating the just cylinder of injected fuel and engine revolution stop position before ignition switch is closed according to serviceability at that time, and the initial position of the crankshaft when determining next engine start according to the stop position of being estimated, initial injection cylinder and initial ignition cylinder in the time of can determining next engine start.

Engine revolution stops (position of torque=0) on a position, at this moment, when hypothesis did not have that engine revolution stops under the friction situation in the motor, the positive torque in the negative torque in the compression stroke and other cylinders in the expansion stroke balanced each other.But the necessary being of motor friction causes stop position to change in the crank angle range of relatively large scope, and torque this moment is lower than engine friction.Therefore, utilize the technology in the patent document 2, be difficult to accurately estimating engine rotation stop position, the result be possible when engine start the definite initial injection cylinder and the initial ignition cylinder of mistake.Start-up operation and toxic emission when therefore, being difficult to improve startup.

And, utilize patent document 2, can be by the engine operation state (suction press, engine rotary speed) of basis when ignition switch is closed, calculating up to crankshaft because the rotation of the inertia rotation (TDC number) till stopping, and according to just before ignition switch is closed the cylinder of injected fuel estimate engine revolution stop position and rotation (TDC number) till stopping, estimate the initial cylinder of continuous injection when next engine start.

Because according to patent document 2, have only the kinetic energy of engine inertia to be carried out matching treatment in advance with storage, and do not predict the variation of kinetic energy at stopping period, therefore, because the variation of the variation that the manufacturing tolerances of motor causes, the variation in transit time and motor friction (for example, because the viscosity change that the temperature variation of engine lubricating oil causes) will cause the possibility to the erroneous calculations of the rotation when the crankshaft that rotates owing to inertia stops (TDC number).Therefore, utilize patent document 2 will be difficult to accurately estimating engine rotation stop position, initial injection cylinder and initial ignition cylinder during consequently with definite engine start of mistake, thus worsen startup quality and toxic emission when starting more.

In addition, in order in explosive motor, to carry out the control of match operation condition, need to be grasped the amount of the kinetic energy that this explosive motor has.Traditionally, in engine control, be extensive use of engine rotary speed as the value of representing kinetic energy.According to for example patent document 2 (JP-A-11-107823), calculate up to because the rotation (TDC number) of the crankshaft that inertia rotates till stopping according to switching to engine operation state (suction press, engine rotary speed) when closing when ignition switch, and, can estimate the initial cylinder of continuous injection when next engine start according to the cylinder of injected fuel and before ignition switch is closed just up to the rotation (TDC number) of stop position.

And, according to patent document 3 (JP-A-2001-82204), in the oil-break implementation when slowing down, judge whether to utilize motor (motor/generator etc.) to exceed predetermined speed than normal rotational speed Nel for turning back to supplying fuel from oil-break

Rotational speed drive motor.Driving under the feasible situation, the oil return rotational speed is set at lower rotational speed Ne2, thereby improves oil consumption, driving under infeasible situation, the oil return rotational speed is set at normal oil return rotational speed Nel.

But similar to patent document 2 according to patent document 2, the kinetic energy of engine inertia has been carried out matching treatment in advance with storage, and can not predict the variation of kinetic energy at stopping period.Therefore, because the rotation (TDC number) of estimation till the crankshaft rotation that is caused by inertia stops that the variation that engine friction causes (for example, because the viscosity that the temperature variation of engine lubricating oil causes variation) will lead to errors.In addition, because the variation in transit time etc. causes producing under the situation of skew from the constant that carries out matching treatment, be difficult to realize proofreading and correct.

And, according to patent document 3 disclosed contents, only supply of fuel is returned rotational speed and prepared to act as a fuel to return fixed condition really, and do not predict the variation of rotational speed, i.e. the variation of kinetic energy.Therefore, supply of fuel is returned rotational speed and be set at higher rank to avoid engine stall.Therefore, will lose oil consumption.

Summary of the invention

First purpose of the present invention is to reduce the variation of engine revolution stop position, and accurately determine the information of engine revolution stop position, the information of the initial position of the crankshaft when being engine start, thereby startup quality and toxic emission when improve starting.

In order to realize first purpose,,, engine revolution is stopped by increasing the compression gas-pressure of the compression stroke when engine revolution will stop according to the present invention.Like this, when the compression gas-pressure when engine revolution stops in the compression stroke increases, the negative torque that produces in compression stroke will increase with the strength as the obstruction engine revolution, thereby the crank angle range (crank angle range, wherein engine revolution can be stopped) that engine revolution is stopped and making torque be lower than engine friction becomes less than traditional scope that the crankangle engine revolution is stopped.Therefore, the variation of engine revolution stop position is in than in the littler crank angle range of traditional scheme, thereby can accurately obtain the information (information of the initial position of the crankshaft when engine start) of engine revolution stop position, thereby improve startup quality and toxic emission when starting.

Second purpose of the present invention is that accurately estimating engine rotates stop position, startup quality and toxic emission when starting to improve.

In order to realize second purpose, according to the present invention, ceasing and desisting order according to the motor of shutting engine down rotation stops igniting and/or fuel sprays, thereby calculates the parameter that the parameter of represent power operation and calculating are used to hinder power operation.At the engine revolution stopping period, hinder the parameter of power operation according to the parameter of representing engine revolution and being used to and come estimating engine rotation stop position.In this case, during calculating the parameter of representing power operation and being used to hinder the parameter of power operation, can consider because the variation of the variation that the motor manufacturing tolerances causes, the variation in transit time and motor friction (for example, because the viscosity that the temperature variation of engine lubricating oil causes variation).Therefore, can than conventional art estimating engine rotation more accurately stop position, thereby compare, improve startup quality and toxic emission when starting according to these parameters with conventional art.

The 3rd purpose of the present invention is the kinetic energy in future of accurately estimating explosive motor and being had.

In order to realize the 3rd purpose, calculate the current kinetic energy of explosive motor, calculate the work load that is used to hinder the explosive motor motion, and estimate kinetic energy in the future according to current kinetic energy that calculates and work load.Owing to consumed the kinetic energy of explosive motor as impede motion role's working load, so can estimate kinetic energy in the future by the current kinetic energy and the motion-impeding work load that calculate explosive motor.

Description of drawings

Utilization can more obviously be found out above-mentioned and other purposes of the present invention, feature and advantage with reference to the description of the drawings.In the accompanying drawing:

Fig. 1 illustrates the schematic representation of the engine control system in the first embodiment of the invention;

Fig. 2 illustrates the time diagram of the example that engine revolution stops to control;

Fig. 3 illustrates the time diagram of the example that engine revolution stops to control;

Fig. 4 is illustrated in the flow chart that engine revolution stops to handle in the control program;

The time diagram of the example that fuel sprayed when Fig. 5 illustrated engine start;

The time diagram of IGNITION CONTROL example when Fig. 6 illustrates engine start;

The flow chart of handling in the fuel injection control program when Fig. 7 illustrates engine start;

The flow chart of handling in the ignition control program when Fig. 8 illustrates engine start;

Fig. 9 illustrates an example of control, wherein uses the Variable Valve Time control mechanism to carry out engine revolution and stops control;

Figure 10 illustrates an example of control, wherein uses changeable air valve lifting (lift) control mechanism to carry out engine revolution and stops control;

Figure 11 illustrates the schematic representation of the engine control system of second embodiment of the invention;

Figure 12 illustrates each cylinder stroke state of four cylinder engine;

Figure 13 illustrates each cylinder stroke state of six cylinder engine;

Figure 14 illustrates the time diagram according to the method for second embodiment's estimating engine rotation stop position;

Figure 15 illustrates the relation between the engine rotary speed and multiple loss amplitude in the petrol engine;

Figure 16 illustrates the flow chart of handling in the engine revolution stop position estimation program according to second embodiment;

Figure 17 illustrates the time diagram according to the method for third embodiment of the invention estimating engine rotation stop position;

Figure 18 illustrates the flow chart according to the processing in the 3rd embodiment's engine revolution stop position estimation program;

Figure 19 illustrates the time diagram according to fourth embodiment of the invention estimating engine rotation stop position;

Figure 20 illustrates according to the 4th embodiment and stops the flow chart to handle in the determined value computer program at motor;

Figure 21 illustrates the flow chart of handling according to the 4th embodiment in engine revolution stop position estimation program;

Figure 22 illustrates the time diagram according to the method for the 5th embodiment's estimating engine rotation stop position;

Figure 23 illustrates the flow chart of handling according to the 5th embodiment in engine revolution stop position estimation program;

Figure 24 illustrates the schematic representation according to the engine control system of sixth embodiment of the invention;

Figure 25 illustrates the moment (timing) of the variation and the kinetic energy estimation of engine rotary speed;

Figure 26 illustrates the flow chart of handling according in the 6th embodiment's engine rotary speed estimation program;

Figure 27 illustrates the relation between the engine rotary speed and multiple loss amplitude in the petrol engine;

Figure 28 illustrates the flow chart of handling according in the seventh embodiment of the invention engine rotary speed estimation program.

Embodiment

(first embodiment)

At first, provide a closure 14, utilize closure opening degree sensor 15 to detect opening degree (solar term opening degree) TA of closure 14 in the centre of the suction tude 13 that is connected with the suction port 12 of motor 11 with reference to Fig. 1.In suction tude 13, provide bypass path 16, thereby bypass closure 14 provides an IACV (Idle Air Control Valve) (isc valve) 17 at the middle part of bypass path 16.Downstream side at closure 14 provides manifold air pressure sensor 18, is used to detect manifold air pressure PM, and Fuelinjection nozzle 19 is installed near the suction port 12 of each cylinder.

The catalyzer 22 that is used for waste-gas cleaning is installed at middle part at the outlet pipe 21 that is connected with the relief opening 22 of motor 11.On the cylinder block of motor 11, be provided for detecting the cooling-water temperature sensor 23 of cooling water temperature THW.Crank angle sensor 26 is installed makes it face the excircle of the signal rotor 25 on the crankshaft 24 that is installed in motor 11, when predetermined crank angle (for example 10 ° of CA) had been rotated in rotation each and signal rotor 25 synchronously, crank angle sensor 26 was just exported a crank angle signal CRS.And, one cam angle sensor 29 also is installed makes it face the excircle of the signal rotor 28 on the crankshaft 27 that is installed in motor 11, when having rotated predetermined cam angle synchronously with the rotation of signal rotor 28, this cam angle sensor 29 is with regard to output cam angle signal CAS (Fig. 5).

The output of these a plurality of sensors is input in the electric engine control unit (ECU) 30.This ECU30 mainly comprises a microcomputer as engine controlling unit, be used for according to the detected engine operation state of multiple sensors, the fuel injection amount and the fuel injection time point of control Fuelinjection nozzle 19, the firing time of spark plug 31, bypass air amount of isc valve 17 or the like.

In the present embodiment, ECU30 is as stopping-Time Compression air pressure increase control gear, be used for before motor to be ready stopping the rotation, increasing bypass air amount (air inflow) by isc valve 17, thereby increase the compression gas-pressure in next compression stroke, ECU30 can also be as engine controlling unit, be used for engine revolution stop position data storage at that time can rewritten, nonvolatile memory (storage device) is for example among standby RAM32 etc., thereby when next engine start, the engine revolution stop position information of being stored is used beginning fuel injection control and IGNITION CONTROL as the initial position message of crankshaft 24.

Time diagram (example of four cylinder engine) with reference to Fig. 2 and 3 illustrates that the engine revolution among first embodiment stops control.

As shown in Figure 2, when produce a motor cease and desist order (ON) by the requirement that ignition switch closing operation or idle running are stopped, and in firing pulse and the fuel injection pulses one or when stopping all, this moment is because inertia energy, motor 11 will continue rotation a period of time, simultaneously because multiple loss (the driving loss of pumping loss, frictional loss, auxiliary device etc.) engine revolution is slack-off.At this moment, just the inlet air amount increases in the suction stroke before motor stops, thereby has increased the compression gas-pressure in next compression stroke (COM), thereby has stopped engine revolution by force.The explosion stroke of motor 11 and exhaust stroke are represented by EXP among Fig. 2 and EXH respectively.

The example that engine revolution stops to control is described below.

According to the moment engine rotary speed Ne (i) before engine revolution stops just whether becoming approach predetermined value KNEEGST (for example 400rpm) and ISC whether be set to all open (load=100%) thus the air inflow of motor 11 is increased and and then cause that compression gas-pressure increases in next compression stroke, judge whether engine revolution just stops.In an example of the control shown in Fig. 2 and 3, by increasing the air inflow in the #3 cylinder suction stroke, can increase the wherein compression gas-pressure of the already added #3 cylinder of air inflow, thereby increase the strength that stops engine revolution, realize shutting engine down rotation by force.

Fig. 3 is illustrated in engine revolution according to present embodiment and stops to control the variation that situation about being performed and engine revolution stop to control engine revolution stop position under the situation about not being performed.

Carrying out under the situation that engine revolution stops to control, the compression gas-pressure P in this cylinder (the #3 cylinder in the example shown in Figure 3) increases, therein, and just air inflow increase in the suction stroke before engine revolution stops.Increase along with compression gas-pressure P, negative direction torque T in the compression stroke increases, as the strength that stops engine revolution, engine revolution is braked like this, this crank angle range (carrying out the crank angle range that engine revolution stops) is less than common scope, torque this moment is equal to or less than engine friction, and engine revolution is stopped in this crank angle range.In control example shown in Figure 3, engine revolution stops in the scope of 140 ° of CA-100 ° of CA of the compression BTDC of #3 cylinder.

On the contrary, do not carrying out under the situation that engine revolution stops to control, the torque T of negative direction does not increase in compression stroke, and with the forward torque T balance in the explosion stroke of another cylinder (the #1 cylinder in the example shown in Figure 3 is as the outburst cylinder), therefore this negative sense torque is not used as the power that stops rotation in this stroke and because the scope of crankangle changes the engine revolution stop position in very wide scope, in this crank angle range, engine revolution does not stop, even and when engine revolution is stopped torque also be reduced to below the engine friction.In the control example of Fig. 3, stop under the control situation not carrying out engine revolution, near ° CA to 60 ° of CA of the compression BTDC140 of #3 cylinder, BTDC180 ° of CA of compression and compression TDC, the engine revolution stop position changes in wide range.Therefore, when next engine start, can not accurately be identified for the cylinder (initial injection cylinder) of initial injection and be used for the cylinder (initial ignition cylinder) of initial ignition.

It is to stop control program (flow process) by ECU30 according to engine revolution shown in Figure 4 to carry out that above-mentioned engine revolution stops to control.(for example every 8ms) repeats this program in each scheduled time.When this program begins, judge at first in step 101 whether engine revolution stops.At this moment, whether during preset time, be imported in (for example 300ms) or longer time according to the crank angle signal CRS of 26 outputs of crank angle sensor for example and judge among the ECU30 whether engine revolution stops.

When engine revolution stopped, step 101 was judged as "Yes", and program is not carried out following processing and interrupted.On the contrary, under the situation that engine revolution does not stop, step 101 is judged as "No", the treatment step 102 below then carrying out.

At first, in step 102-105, judge whether the satisfied condition that engine revolution stops to control that is used to carry out.This is used to carry out the condition that engine revolution stops to control and comprises following (1)-(4).

(1) for example, by requiring idle running to stop or the ignition switch closing operation produces motor cease and desist order (step 102).

(2) stop fuel injection and igniting, be used for engine revolution condition slack-off and that engine revolution stops and be satisfied (step 103).

(3) the idle running switch is in open mode, and this moment, closure 14 was closed and solar term degree of opening TA is no more than predetermined value (for example 1.5deg or still less) (step 104) fully.

(4) the engine rotary speed Ne (i) that calculates at each TDC (top dead center) is less than predetermined value kNEEGST (for example 400ms) (step 105).

When had all satisfied all conditions (1)-(4), the condition that the execution engine revolution stops to control satisfied.When in the aforementioned condition any one do not satisfy, carry out the condition that engine revolution stops to control and do not satisfy.

Under the situation that the condition that the execution engine revolution stops to control does not have to satisfy, be when being judged as "No" in any one among the step 102-105, processing enters step 110, the controlling value of isc valve 17 is set at the desired value DISC that normally calculates in idle speed control, enter step 111 then, keeping (or resetting) engine revolution to stop control execution sign XEGSTCNT is that " 0 " is to stop this program.

Stop to control under the satisfied situation of executive condition in engine revolution, be that judged results all among the step 102-105 is when all being "Yes", processing enters step 106, judges whether the engine rotary speed Ne (i-1) of last time surpasses the just rotational speed kNEEGST before stopping (for example 400rpm).Be judged as in step 106 under the situation of "No", promptly under the situation of the engine rotary speed Ne of last time (i-1) less than the rotational speed kNESSGST before just stopping, program stops.

On the contrary, in step 106, be judged as under the situation of "Yes", promptly at the engine rotary speed Ne of last time (i-1) greater than the rotational speed kNESSGST before just stopping, and this time under the situation of engine rotary speed Ne (i) less than the rotational speed kNEEGST before stopping just, judge that engine revolution just stops, processing enters step 107, by force the controlling value of isc valve 17 is set at entirely and opens (isc valve load=100%) thereby the air inflow that has increased motor 11, and then increased compression gas-pressure in next compression stroke so that shutting engine down rotation by force.Processing in the step 107 can be used as and stops-Time Compression air pressure increase controlling method.

Then, in next step 108, engine revolution is stopped control execution sign XEGSTCNT and be set at " 1 ", this means that engine revolution stops the control execution and finishes (over).Then, thus handle and to enter step 109 engine revolution stop position information (information of cylinder CEGSTIN that for example stops in suction stroke SUC and the cylinder CEGSTCMP that stops in compression stroke COM) is stored among the standby RAM32.In this case, in the control example shown in Fig. 2 and 3, the #4 cylinder is stored as suction stroke cylinder CEGSTIN when engine revolution stops, and the #3 cylinder is stored as compression stroke cylinder CEGSTCMP.

Stop in the control in engine revolution according to present embodiment, isc valve 17 is used as the device that increases compression gas-pressure in the compression stroke, by just before engine revolution stops, by force isc valve 17 all being opened, can increase the compression gas-pressure in next compression stroke to increase the air inflow of motor 11.Be used to be equipped with in the present invention under the situation of system of electronic throttle, this moment this electronic throttle can by actuator for example device such as motor opening of closure carried out electric control, can by just before engine revolution stops by force opening throttle increase compression gas-pressure in next compression stroke with the increase air inflow.

In addition, in the control during normal running, usually need to consider after isc valve 17 is opened to enter operating lag in the firing chamber up to air.But in the present embodiment,, therefore can not consider that the operating lag of air increases air inflow, thereby can when stopping, accurately increasing compression gas-pressure because closure or isc valve 17 are just controlled before engine revolution stops.

In addition, compression gas-pressure that can be when adopting changeable air valve timing controlled mechanism to be used to increase engine revolution and to stop as such device, thereby can control engine revolution in igniting-(advance) mode that shifts to an earlier date and stop intake valve timing before, so that close intake valve at air inlet BDC (lower dead center), thus prevent air in the cylinder in compression stroke early stage adverse current to suction tude 13.

Perhaps, can increase compression gas-pressure like this, the device of the compression gas-pressure when stopping by adopting the conduct of modulating valve lifting control mechanism to be used to increase engine revolution increases the just lift range variable before engine revolution shown in Figure 10 stops, thereby increases air inflow.

Below, utilize the time diagram shown in Fig. 5 and 6 (example of four cylinder engine) to illustrate that the engine revolution at Fig. 4 stops in the step 109 of control program, utilize the engine revolution stop position information (when engine revolution stops, the information of suction stroke cylinder CEGSTIN and compression stroke cylinder CEGSTCMP) of storing among the standby RAM32 to carry out the fuel injection control when engine start and the method for IGNITION CONTROL.In Fig. 5 and 6,, thereby change output 6 pulse signals in (720 ° of CA) at per two of crankshaft from cam angle sensor 29 output cam angle signals.Crank angle sensor 26 output crank angle signals, thus in the revolution (360 ° of CA) of crankshaft 24 output signal, the pulse number of those signals equals 36 pulses and deducts 6 pulses.

In addition, crank angle signal all has a pulse spacing when pulse of input, and detects whether there is omission according to this pulse spacing.Then, omit the result who detects, carry out cylinder discrimination according to the following mode that will describe according to the pulse number and the crank angle signal of cam angle signal.

When starting, carry out in the fuel injection control according to stop position information shown in Figure 5, owing to stored stop position information in advance, therefore according to stop position information and executing fuel injection control.More specifically, thereby activated when making motor begin to rotate when starter, carry out fuel at this moment among Cun Chu the suction stroke cylinder CEGSTIN (the #4 cylinder in the example shown in Figure 5) and spray (iNJ) (starter asynchronous injection of Fig. 5).

Then, carry out the differentiation of cylinder, which cylinder discrimination to spray the testing result that control is performed synchronously, realize the synchronous burner oil of suction stroke with each cylinder according to according to the omission of the pulse number of cam angle signal and crank angle signal.

In IGNITION CONTROL when starting shown in Figure 6,, therefore carry out IGNITION CONTROL according to this stop position information owing to stored stop position information in advance according to stop position information.Especially, thereby, starter make motor begin to rotate and during the omission of crank angle signal also detected (BTDC35 ° of CA) when activateding, the igniting that starts the compression stroke cylinder CEGSTCMP (the #3 cylinder in Fig. 6 example) that stored at that time excites, and carries out igniting (IGN) (the later half omission (missing) that lacks continuously in the compression stroke of #3 motor) constantly at BTDC5 ° of CA then.

After the igniting, carry out cylinder discrimination, carry out IGNITION CONTROL according to the testing result of cylinder discrimination according to the pulse number of cam angle signal and the omission of crank angle signal.

Fuel during above-mentioned startup sprays and IGNITION CONTROL is that ECU30 carries out according to the program shown in Fig. 7 and 8.

As shown in Figure 7, during beginning, (for example every 4ms) repeats the fuel injection control program in each scheduled time.After program begins, judge when engine rotary speed is lower than predetermined value (for example 500rpm) in step 201 that at first startup is whether for once.When judging engine rotary speed greater than predetermined value (for example 500rpm), program stops, and does not carry out following operation.

On the contrary, judge when engine rotary speed is lower than predetermined value (for example 500rpm) whether start is that 202 mode is carried out the fuel injection control when beginning according to the following steps under once the situation in step 201.At first, judge in step 202 whether the cylinder discrimination that carries out according to the omission of the pulse number of cam angle signal and crank angle signal is finished.Under the situation that cylinder discrimination has been finished, owing to known current crankangle (current location of crankshaft 24), therefore handle entering step 207 and judge whether current crankangle is in synchronous time for spraying by cylinder discrimination.Like this, when judging that current crankangle is not in synchronous time for spraying, terminator and do not carry out any operation.

When in step 207, judging that current crankangle is in synchronous time for spraying, handle entering step 208, carry out injection synchronously thereby calculate synchronous emitted dose Ti according to following formula, this formula is Ti=TAUST+TV

Here, TAUST represents according to each parameter of motor 11 and definite effective discharge time, be according to the data mapping (data map) of cooling water temperature, suction press, engine rotary speed etc. or similarly method specifically calculate.And TV represents the required invalid discharge time of Fuelinjection nozzle 19 responses, and it is to calculate by data mapping or similar method according to cell voltage.

Simultaneously, when in step 202, determining that cylinder discrimination is not finished, judge whether to have satisfied fuel injection control executive condition below in step 203 and the step 204 based on the stop position storage.This executive condition comprises, for example Xia Mian two conditions (1) and (2).

(1) starter is opened from closing to switch to, and the rotation during startup has begun (step 203);

(2) engine revolution stops control and carries out sign XEGSTCNT and be set as " 1 ", this means that engine revolution stops to control complete (step 204).

When has all satisfied condition (1) and (2), be satisfied based on the fuel injection control executive condition of stop position storage.When any one condition does not satisfy, dissatisfied based on the fuel injection control executive condition of stop position storage.

Under the situation that not have to satisfy at fuel injection control executive condition, promptly be judged as under the situation of "No" program termination and do not carry out following processing in any in step 203 and 204 based on stop position storage.

On the contrary, under the situation that the fuel injection control executive condition based on the stop position storage has satisfied, promptly in step 203 and 204, judge all be under the situation of "Yes", handle entering step 205, carry out fuel injection control based on the stop position storage.The execution of being somebody's turn to do the fuel injection control of storing based on stop position is asynchronous with actual crankangle.More specifically, according at a time (in fact, this is meant constantly that in step 203 starter of determining switches to the moment of opening from closing) the stop position storage, carry out the asynchronous injection that enters suction stroke cylinder CEGSTIN, be judged as "Yes" in step 203 and the step 204 this moment.At this moment, calculate asynchronous injection amount Ti according to following formula.

Ti＝TASYST+TV

Here TASYST represents according to each parameter of motor and definite effective discharge time, it according to cooling water temperature, suction press etc. by data mapping or similarly method specifically calculate.And TV represents the required invalid discharge time of Fuelinjection nozzle 19 response, it according to cell voltage etc. by map or similarly method calculate.

After asynchronous injection is carried out, handle entering step 206, with engine revolution stop control carrying out sign XEGSTCNT reset (reset) be " 0 ", terminator.

In above-mentioned control example, switch to the moment of opening at starter from closing, carry out the asynchronous injection that enters suction stroke cylinder CEGSTIN.But, in identical suction stroke, carry out under the situation of spraying, can when crank signal is transfused to pre-determined number, carry out fuel and spray, also can be transfused to and switch to moment of opening and carry out fuel behind the predetermined period of time in the past and spray from closing at crank angle signal from starter.

Repeat startup shown in Figure 8-time IGNITION CONTROL every predetermined period of time (for example when importing crank angle signal).When program begins, at first judge in step 301 whether start is once when engine rotary speed is lower than predetermined value (for example 500rpm).When judging engine rotary speed greater than predetermined value (for example 500rpm), program stops, and does not carry out following operation.

On the contrary, judge when engine rotary speed is lower than predetermined value (for example 500rpm), start that startup one time IGNITION CONTROL is carried out in beginning 302 mode according to the following steps under the situation once in step 301.At first, judge in step 302 whether the cylinder discrimination that carries out according to the omission of the pulse number of cam angle and crank angle signal is finished.Under the situation that cylinder discrimination has been finished, owing to known current crankangle (current location of crankshaft 24), therefore handle entering step 309 by cylinder discrimination, when BTDC35 ° of CA, begin to excite each cylinder, thereby when BTDC5 ° of CA, carry out igniting.

When in step 302, determining that cylinder discrimination is not finished, judge whether to have satisfied IGNITION CONTROL executive condition below in step 303 and the step 304 based on the stop position storage.This executive condition comprises, for example Xia Mian two conditions (1) and (2).

(1) engine revolution stops control and carries out sign XEGSTCNT and be set as " 1 ", this means that engine revolution stops to control complete (step 303);

(2) detect crank angle signal and omit (BTDC35 ° of CA) (step 304).

When has all satisfied condition (1) and (2), all satisfied based on the IGNITION CONTROL executive condition of stop position storage.When any one condition does not satisfy, dissatisfied based on the IGNITION CONTROL executive condition of stop position storage.

Under the situation that not have to satisfy at IGNITION CONTROL executive condition, promptly be judged as under the situation of "No" program termination and do not carry out following processing in any in step 303 and 304 based on stop position storage.

On the contrary, under the situation that the IGNITION CONTROL executive condition based on the stop position storage has satisfied, promptly judge all be under the situation of "Yes" in step 303 and 304, with the processing mode according to subsequent step 305, the igniting of carrying out based on the stop position storage excites control.When detecting crank angle signal and omit (BTDC35 ° of CA), handle entering step 305, beginning excites based on the compression stroke cylinder CEGSTCMP's of stop position storage.Then, handle entering step 306, storage judges whether in the igniting of the moment of BTDC5 ° of CA according to stop position.In this case, because one or more cylinder stops to be stored in advance in compression stroke, therefore can between omitting separately and omitting continuously, make differentiation, thereby determine the moment of BTDC5 ° of CA.

When in step 306, judging igniting not under the situation in moment of BTDC5 ° of CA, terminator.Enter step 307 when judging igniting under the situation in the moment of BTDC5 ° of CA, handling, carry out the igniting of the compression stroke cylinder CEGSTCMP that stores based on stop position in the moment of BTDC5 ° of CA.Then, handle entering step 308, engine revolution is stopped control execution sign XEGSTCNT be set at " 0 ", terminator.

In the above-described embodiment, owing to stop to control by the engine revolution before engine revolution stops just and increased air inflow, thereby increased the compression gas-pressure in the compression stroke, therefore, by causing negative torque to increase because engine revolution stops compression gas-pressure increase before, shutting engine down rotates by force.Increased compression gas-pressure owing to utilize this engine revolution to stop control, so crank angle range (realize engine revolution stop crank angle range) becomes narrower than traditional range, in this crank angle range, torque becomes and is equal to or less than engine friction.Therefore, the variation of engine revolution stop position can be included in than in the littler scope of traditional crank angular region, and can accurately obtain engine revolution stop position information (when engine revolution stops, the information of suction stroke cylinder CEGSTIN and compression stroke cylinder CEGSTCMP) and it is stored among the standby RAM32.Therefore, when engine start, can utilize the engine revolution stop position information that is stored among the standby RAM32 to come ato unit, even thereby before cylinder discrimination is finished, also can accurately determine initial injection cylinder and initial ignition cylinder, thereby can improve the toxic emission that starts quality and starting when.

In addition, the present invention is not limited to four, also can be applicable to three cylinders or the still less motor of cylinder or five cylinders or the more motor of multi cylinder.In addition, the present invention is not limited to tuned port injection motor shown in Figure 1, also can be applicable to in-cylinder injection motor and lean-burn engine.

(second embodiment)

As shown in figure 11, second embodiment of the invention is similar to first embodiment (Fig. 1) configuration.

According to second embodiment, the time diagram in the motor stopped process as shown in figure 14 comes estimating engine rotation stop position.Instant engine rotational speed Ne when each compresses TDC is used as the parameter of power operation.ECU30 measures for example 30 ° of time spans that CA is required of crankshaft 24 rotations according to the output gap of crank pulse signal CRS, to calculate instantaneous rotational speed Ne.

Energy balance when here, i compresses TDC (TDC (i)) among consideration Figure 14.Driving loss in pumping loss in the each several part, frictional loss and each supplementary equipment all should be considered the merit (work) that hinders power operation.Suppose that the kinetic energy of motor when time point TDC (i-1) is E (i-1), then the merit that causes by each loss consumes kinetic energy E (i-1), and till reaching next TDC (i), this moment, kinetic energy was reduced to E (i).The relation of this energy balance is represented by following formula (1):

E(i)＝E(i-1)-W (1)

Here, W is illustrated in the addition of whole merits of each loss institute loss in time lag between TDC (i-1) and the TDC (i).

And, suppose power operation for rotatablely moving, then this motion can be represented by following formula (2):

E＝J×2π ²×Ne ² (2)

Here, E represents the kinetic energy of motor, and J represents the moment of inertia of determined each motor, and Ne represents instantaneous rotational speed.

Utilize formula (2), the instantaneous rotational speed variation relation of available following formula (3) expression comes the energy balance relations in the replacement formula (1).

Ne(i) ²＝Ne(i-1) ²-W/(J×2π ²) (3)

In a second embodiment, second expression on formula (3) right side is used to hinder the parameters C stop of power operation, limited by following formula (4).

Cstop＝W/(J×2π ²) (4)

The parameters C stop that is used to hinder power operation can utilize following formula (5) to calculate, and this formula (5) is derived from formula (3) and formula (4).

Cstop＝Ne(i-1) ²-Ne(i) ² (5)

And as formula (4) limited, the parameters C stop that is used to hinder power operation was determined that by work load W and the moment of inertia J wherein this work load W hinders the corresponding loss between the TDC.Under the slow-speed of revolution moving condition of motor stopping period, driving loss in pumping loss in the each several part, frictional loss and each auxiliary device all should be considered to be used to hinder power operation, supposes to think that they have the value of the substantial constant that has nothing to do with engine rotary speed Ne.Accordingly, at the motor stopping period, the work load W that supposes to hinder power operation has a substantially invariable value between all TDC.In addition, because the moment of inertia J has (assume) and be the exclusive value of each motor, so the parameters C stop that is used to hinder power operation has substantially invariable value at the motor stopping period.

Therefore, the current instantaneous rotational speed Ne (i) that utilization obtains in actual measurement and utilize that formula (5) calculates be used to hinder the parameters C stop that moves between the TDC, can utilize following formula (6a) or (6b) predicted value of the instantaneous rotational speed Ne (i+1) when calculating next TDC (i+1).

As Ne (i) ²During 〉=Cstop, $\mathrm{Ne}(i+1)=\sqrt{\mathrm{Ne}{\left(i\right)}^2-C_{\mathrm{stop}}}---\left(6a\right)$

As Ne (i) ²During＜Cstop, Ne (i+1)=0 (6b)

Here, at Ne (i) ²Under the situation of＜Cstop, hinder the work load W that moves between the TDC and become greater than kinetic energy E (i), promptly the current energy that has of motor like this, for fear of by calculating any imaginary number that produces, is supposed Ne (i+1)=0.

In a second embodiment, predicted value and the default determined value Nth that stops by instantaneous rotational speed Ne (i+1) that back first TDC (i+1) is located compare, can determine whether engine revolution stops, thereby estimation is in the stroke state of each cylinder of engine revolution stop position.

ECU30 carries out the estimation of engine revolution stop position among above-mentioned second embodiment according to engine revolution stop position estimation program shown in Figure 16.Each TDC carries out this program, and this program is used as a kind of rotation stop position estimation means.When this program begins,, determine whether to produce motor and cease and desist order according to judging whether to be "Yes" in any one in step 2101 and the step 2102.Specifically, determine that in step 2101 ignition switch is under the situation of closing, or determine that in step 2102 it is under the situation about opening that idle running stops demand, judges the demand that motor stops that having produced, the processing of execution in step 2103, thereby estimating engine rotation stop position.

Simultaneously, judgement in step 2101 and step 2102 all is under the situation of "No", is to open and the demand that stops that dallying is under the situation of closing at the iG switch promptly, judges that motor burns away, be not in the process of stopping, stop this program and do not carry out the estimation of engine revolution stop position.

As mentioned above, when being judged as "Yes" in step 2101 and step 2102 any, judge that motor is in the process of stopping, processing enters step 2103, according to formula (5), the instantaneous rotational speed Ne (i) that utilizes the instantaneous rotational speed Ne (i-1) that located at TDC (i-1) last time and current TDC (i) to locate calculates the parameters C stop that is used to hinder power operation.The processing at step 2103 place is used as the second calculation of parameter means.

After parameters C stop calculating is finished, the predicted value of the instantaneous rotational speed Ne (i+1) that first TDC (i+1) locates after being calculated as in the following manner in step 2104-step 2106.At first, in step 2104, judge Ne (i) ²Whether 〉=Cstop sets up.As Ne (i) ²During 〉=Cstop, handle and enter step 2105, the predicted value of the instantaneous rotational speed Ne (i+1) that first TDC (i+1) locates after being calculated as by formula (6).

On the contrary, as Ne (i) ²During＜Cstop, handle to enter step 2106, the predicted value of the instantaneous rotational speed Ne (i+1) that will locate for first TDC (i+1) later on becomes 0.

After the predicted value that calculates instantaneous rotational speed Ne (i+1), processing enters step 2107, compare by predicted value and the default determined value Nth that stops the instantaneous rotational speed Ne (i+1) that locating for later first TDC (i+1), can judge that engine revolution is should pass through TDC (i+1) to enter following processing, still can not pass through TDC (i+1) and be stopped.That is, when the predicted value of the instantaneous rotational speed Ne (i+1) that locates for later first TDC (i+1) has surpassed defaultly when stopping determined value Nth, judge motor through continuing to rotate for first TDC (i+1) later on, program is terminated.

On the contrary, when the predicted value of the instantaneous rotational speed Ne (i+1) that locates for later first TDC (i+1) is lower than default when stopping determined value Nth, judge that the kinetic energy that motor is located to have at current TDC (i) has reduced motion-impeding work load W, engine revolution can not be stopped through subsequently TDC (i+1), handles entering step 2108.

In step 2108, because estimating engine is at current TDC (i) with for stopping between first TDC (i+1) later on, therefore (for example with the stroke state information of each cylinder in this engine revolution position, suction stroke cylinder and compression stroke cylinder) be stored among the standby RAM32 as engine revolution stop position estimation result, and terminator.

Then, when motor will start, the stroke state information of the information of using each the cylinder stroke state be kept at this engine revolution stop position among the standby RAM32 each cylinder during as engine start, thereby determine initial injection cylinder and initial ignition cylinder, begin fuel injection control and IGNITION CONTROL then.

In the second above-mentioned embodiment, being used for estimation derives at the parameters C stop that TDC (i+1) subsequently locates the formula (6a) of instantaneous rotational speed Ne (i+1) and the kinetic energy E that (6b) has from motor and is used to hinder power operation, in each TDC of motor stopping period, utilize formula (6a) and (6b) calculate the predicted value of the instantaneous rotational speed Ne (i+1) that locates at TDC (i+1) subsequently, thereby the accurately variation of estimating engine rotational speed is till engine rotation stops.According to the predicted value of the instantaneous rotational speed Ne (i+1) that locates at subsequently TDC (i+1) whether less than the default determined value Nth that stops, determine whether engine revolution stops, thus can be than the information of the stroke state of each cylinder in the conventional art estimating engine rotation more accurately stop position.

Therefore, by with the data storage of the stroke state of each cylinder in the engine revolution stop position in standby RAM32, the information of each cylinder stroke state of using an engine revolution stop position during as engine start the stroke state information of each cylinder come accurately to determine initial injection cylinder and initial ignition cylinder, thereby can realize fuel injection control and IGNITION CONTROL, and startup quality and toxic emission when improving engine start.

(the 3rd embodiment)

In a second embodiment, judge according to the predicted value that is the instantaneous rotational speed at first TDC place later on whether engine revolution stops, thereby before engine revolution stops, estimating the engine revolution stop position.

Here, according to the 3rd embodiment, utilize instantaneous rotational speed in the future and be used for motion-impeding parameter, repeat to estimate the processing of instantaneous rotational speed in another future, till definite engine revolution stops, even thereby not just before motor will stop, also can estimating engine rotation stop position.

The method of rotating stop position according to the estimating engine of third embodiment of the invention is described with reference to time diagram shown in Figure 17.Utilize with second embodiment in similar mode, locate to calculate the parameters C stop that is used to hinder power operation and the predicted value of the instantaneous rotational speed Ne (i+1) that locates for later first TDC (i+1) at the motor stopping period at TDC (i).

As mentioned above, because at the motor stopping period, the parameters C stop that is used to hinder power operation has substantially invariable value, therefore the formula (7a) below utilizing and (7b), Cstop that use has been calculated and Ne (i+1) are calculated as the predicted value of the instantaneous rotational speed Ne (i+2) that second TDC (i+2) from now on locate.

As Ne (i+1) ²During 〉=Cstop, $\mathrm{Ne}(i+2)=\sqrt{\mathrm{Ne}{(i+1)}^2-C_{\mathrm{stop}}}---\left(7a\right)$

As Ne (i) ²During＜Cstop, Ne (i+2)=0 (7b)

Like this, repeat and calculate the processing of the predicted value of the instantaneous rotational speed at TDC place in the future, up to instantaneous rotational speed predicted value less than till stopping determined value, thereby estimate that engine revolution stops before TDC, at this TDC place, the predicted value of instantaneous rotational speed is less than stopping determined value.

Carry out estimation by engine revolution stop position estimation program shown in Figure 180 according to the 3rd embodiment's engine revolution stop position.Each TDC carries out this program.According to the mode identical, when this program begins, at first in step 3200 and step 3201, judge whether to produce motor cease and desist order (the iG switch is for cutting out, or idle running stops whether for opening) with second embodiment.When not producing any motor and cease and desist order, judge that motor is not in the process of stopping.Stop this program and do not carry out the estimation of any engine revolution stop position.

On the contrary, cease and desist order when producing, handle and enter step 3202, judge that whether TDC is that motor is ceased and desisted order and produced one (for example the second or the 3rd time) in the scheduled time afterwards when motor.When TDC is not in the scheduled time one, terminator and do not carry out the estimation of engine revolution stop position, and continue standby till the TDC that reaches the scheduled time.Under this mode, by continuing standby till the TDC that reaches the scheduled time, can be under stable status in subsequently a step 3203, calculate the parameters C stop that is used to hinder power operation.

Then at a time point, be that motor is ceased and desisted order when reaching the TDC of the scheduled time after producing, processing enters step 3203, according to the mode similar to second embodiment, instantaneous rotational speed Ne (i) by formula (5) utilizes instantaneous rotational speed Ne (i-1) that TDC last time (i-1) locates and current TDC (i) to locate calculates the parameters C stop that is used to hinder power operation.

Then, handle and enter step 3204, evaluation times counter j is set at initial value " 1 ", this evaluation times counter j is used for the evaluation times of instantaneous rotational speed is counted.At first in step 3205, step 3206 and step 3207 according to the mode similar to second embodiment, be calculated as the estimated value of the instantaneous rotational speed Ne (i+1) that first TDC (i+1) from now on locates.

Then, in the step 3208 below according to for the predicted value of first instantaneous rotational speed Ne (i+1) from now on whether less than stopping determined value Nth.Judge that engine revolution whether can not be through being stopped for first instantaneous rotational speed Ne (i+1) from now on.The result is, surpassed and stop determined value Nth (motor has passed through and has been first TDC (i+1) from now on when being judged as from now on the predicted value of first instantaneous rotational speed Ne (i+1), continue rotation), then handle and enter step 3209, make the inferior counter j of estimation increase by 1, and return execution in step 3205, the processing of step 3206 and step 3207, thus utilize last computation to obtain, and as for the predicted value of first instantaneous rotational speed Ne (i+1) from now on be used for motion-impeding parameters C stop and be calculated as the predicted value of the instantaneous rotational speed Ne (i+2) of second TDC (i+2) from now on.

Then, according to for second the predicted value of instantaneous rotational speed Ne (i+2) from now on whether less than stopping determined value Nth, judging in step 3208 whether engine revolution can pass through to second TDC (i+2) from now on will stop.The result is, stop determined value Nth (motor has passed through and has been second TDC (i+2) from now on when the predicted value that is judged as from now on second instantaneous rotational speed Ne (i+2) has surpassed, continue rotation), then handle and enter step 3209 once more, make the inferior counter j of estimation increase by 1, and the above-mentioned processing of repeated execution of steps 3205-3209.

In the manner described above, the predicted value of double counting instantaneous rotational speed Ne (i+j) from now on less than till stopping determined value Nth, is at interval continuously estimated in the future instantaneous rotational speed Ne (i+j) with TDC up to this value.

Then, at a time point, promptly when the predicted value of instantaneous rotational speed Ne (i+j) in the future when stopping determined value Nth, determine that engine revolution stops before at the TDC of instantaneous rotational speed Ne (i+j) (i+j), processing enters step 3210, with the TDC (i+j) that determines to stop and for from now between first TDC (i+j-1) stroke state of each cylinder of interim (for example suction stroke cylinder and compression stroke cylinder) be stored among the standby RAM32 as the estimation result of engine revolution stop position.For example, when the instantaneous rotational speed Ne (i+3) that locates for the 3rd TDC (i+3) from now on when stopping determined value Nth, determine that engine revolution is for second TDC (i+2) from now on for the interim between the 3rd TDC (i+3) stops from now on.Estimation result as the engine revolution stop position stores with the stroke state of each cylinder of interim between TDC (i+2) and the TDC (i+3).

In the 3rd embodiment, can utilize the predicted value of instantaneous rotational speed Ne (i+j) in the future and be used for motion-impeding parameters C stop, repeat the processing of the estimation instantaneous rotational speed Ne in another future (i+j+1) of any number of times, till definite engine revolution stops.Therefore, can stop to carry out earlier in the process estimation of engine revolution stop position at motor.

(the 4th embodiment)

In the second and the 3rd embodiment, estimated instantaneous rotational speed in the future, and according to the predicted value of this instantaneous rotational speed whether less than the default determined value that stops, judging whether engine revolution stops.Do not estimating under the situation of instantaneous rotational speed in the future, can be by stopping determined value according to the calculation of parameter motor that is used to hinder power operation, and the instantaneous rotational speed of motor stopping period actual measurement and this motor are stopped determined value comparing, come estimating engine rotation stop position.

At first, with reference to time diagram shown in Figure 19 the method for rotating stop position according to the 4th embodiment's estimating engine is described.According to the identical mode of the second and the 3rd embodiment, the parameters C stop that is used to hinder power operation that calculation engine stopping period TDC (i) locates.Utilize parameters C stop and whether through the TDC of the critical rotation speed Nlim that set in advance, calculating with respect to motor by formula (8) is that the motor that stops to stop determined value Nth.At a time point, when promptly the instantaneous rotational speed that obtains when the actual measurement of motor stopping period stops determined value Nth less than motor, judge motor be stop until next TDC, and the stroke state of each cylinder in the estimating engine rotation stop position, its result is stored among the standby RAM32.

$\mathrm{Nth}=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="Nlim"\; filenames="C20061012134400401.png,C20061012134400411.png"\; state="\{\{state\}\}">Nlim</figure-callout>}}^2+C_{\mathrm{stop}}}---\left(8\right)$

By the estimation of each program execution shown in Figure 20 and 21 according to the 4th embodiment's engine revolution stop position.Contents processing in each program illustrates below.

Carry out motor shown in Figure 20 at each TDC and stop the determined value computer program.According to the mode similar, when program begins, at first judge whether to produce motor cease and desist order (the IG switch is whether for cutting out, or idle running stops whether for opening) in step 4301 and step 4302 to second embodiment.When not producing any motor and cease and desist order, judge that this motor is not in the process of stopping, stopping this program, do not carry out the estimation that any motor stops determined value Nth.

On the contrary, when generation one motor is ceased and desisted order, processing enters step 4303, this moment is by formula (5), utilizes TDC last time (i-1) to locate instantaneous rotational speed Ne (i-1) that actual measurement obtains and current TDC (i) and locates the instantaneous rotational speed Ne (i) that actual measurement obtains and calculate the parameters C stop that is used to hinder power operation.

Then, processing enters step 4304, this moment is by formula (8), utilize as not coming calculation engine to stop determined value Nth through the parameters C stop that the predefined value Nlim of the critical rotation speed of TDC and being used to of calculating in step 4303 are hindered power operation, it is relevant whether this value Nth and motor stop, then terminator.

When calculation engine in the step 4304 shown in Figure 20 stops determined value Nth, the engine revolution stop position estimation program shown in beginning Figure 21.When this program begins, in step 4311, the motor that calculates in the actual measured value of current instantaneous rotational speed Ne (i) and the step 4304 is stopped determined value Nth and compare.When the actual measured value of current instantaneous rotational speed Ne (i) stops determined value Nth above motor, judge that motor continues rotation through next TDC (i+1), the program termination.

On the contrary, when the actual measured value of current instantaneous rotational speed Ne (i) is lower than motor and stops determined value Nth, judge that engine revolution stops before at next TDC (i+1).Processing enters step 4312, with current TDC (i) and for later between first TDC (i+1) in interim the stroke state of each cylinder be stored among the standby RAM32 as the estimation result of engine revolution stop position.

In the 4th embodiment, come calculation engine to stop determined value Nth owing to be used to hinder the parameters C stop of power operation, the variation of the therefore variation of motor manufacturing tolerances, the variation in transit time and motor friction (for example, because the viscosity differences that the temperature variation of engine lubricating oil causes) can be reflected in motor stops on the determined value Nth, even thereby when not having the instantaneous rotational speed of estimating engine stopping period, also accurately estimating engine rotates stop position.

In addition, be used as indication at second and third, during the parameter of power operation among four embodiments, can use the motion speed of crankshaft angular speed, piston etc. at engine rotary speed (instantaneous rotational speed).

(the 5th embodiment)

And, can use the parameter of kinetic energy as the indication power operation.Time diagram below with reference to Figure 22 illustrates the 5th embodiment who realizes this purpose.Utilize instantaneous rotational speed Ne (i-1) that TDC last time (i-1) and current TDC (i) actual measurement obtain and Ne (i) the moment of inertia J, calculate kinetic energy E (i-1) and the E (i) of TDC (i-1) and TDC (i) by formula (2) with the motor of previous calculating.In the 5th embodiment, use the parameter of kinetic energy E as the indication power operation.

When according to the identical mode of second to the 4th embodiment, driving in frictional loss in pumping loss, the each several part and each auxiliary device loss all is thought of as when being used to hinder the merit of power operation, can utilize formula (9), kinetic energy E (i-1) that is located by TDC (i-1) and TDC (i) and the difference of E (i) obtain whole work loads of the obstruction power operation that produces between TDC (i-1) and TDC (i).

W＝E(i-1)-E(i) (9)

In the 5th embodiment, whole carrying capacity W that will be used to hinder power operation are used as the parameter of indication power operation.

As mentioned above, be considered to be used for hinder the pumping loss of the merit of power operation, the frictional loss and the loss of the driving in each auxiliary device of each several part is constant basically, and be irrelevant with the rotational speed of motor stopping period.Therefore, be used for motion-impeding merit W and have substantially invariable value in the time lag between any TDC of motor stopping period.Therefore, utilize current motor kinetic energy E (i) and be used for motion-impeding merit W, can calculate the predicted value of the kinetic energy E (i+1) that locates for first TDC (i+1) from now on by following formula (10).

E(i+1)＝E(i)-W (10)

In the 5th embodiment, the predicted value of the motor kinetic energy E (i+1) that TDC in future (i+1) is located and stop determined value Eth and compare judging whether engine revolution stops, thus estimate stroke state at each cylinder of engine revolution stop position.

As mentioned above, the engine revolution stop position of carrying out among the 5th embodiment by engine revolution stop position estimation program shown in Figure 23 is estimated.Each TDC carries out this program.When program begins,, judge whether to produce a motor cease and desist order (whether the iG switch closes, or idle running stops whether to open) in step 5401 and step 5402 at first according to the mode similar to second embodiment.When not producing any motor and cease and desist order, judge that motor is not in the process of stopping, terminator and do not carry out the estimation of any motor stop position.

On the contrary, when generation one motor is ceased and desisted order, processing enters step 5403, utilizes the actual measured value of the instantaneous rotational speed Ne (i) that current TDC (i) locates and the engine inertia amount J that had before calculated, and calculates the kinetic energy E (i) of current TDC (i) by formula (2).

Then, handle entering step 5404, the difference between the kinetic energy E (i) that kinetic energy E (i-1) that use TDC last time (i-1) locates to calculate and current TDC (i) locate to calculate draws the work load W that is used to hinder power operation.Then, in step 5405 subsequently, obtain current kinetic energy E (i) and be used to hinder difference between the operating load amount W of power operation to be calculated as the predicted value of the kinetic energy E (i+1) of first TDC (i+1) from now on.

Then, processing enters step 5406, predicted value and the default determined value Eth that stops for the kinetic energy E (i+1) of first TDC (i+1) are from now on compared, thereby judge whether engine revolution passes through TDC (i+1) and execution processing subsequently, perhaps can not pass through TDC (i+1) and be stopped.That is,, judge this motor through being first TDC (i+1) from now on, and continue rotation, the program termination when having surpassed for the kinetic energy E (i+1) of first TDC (i+1) from now on when stopping determined value Eth.

On the contrary, when for the kinetic energy E (i+1) of first TDC (i+1) from now on when stopping determined value Eth, judge that engine revolution can not and be stopped through next TDC (i+1), handles entering step 5407.

In step 5407, owing to estimate motor at current TDC (i) with for stopping between first TDC (i+1) later on, therefore the information of the stroke state of each cylinder in the engine revolution stop position (for example suction stroke cylinder and the compression stroke cylinder) result as the estimation of engine revolution stop position is stored among the standby RAM32, stops this program.

In the 5th embodiment, even be used as when being used to hinder the parameter of power operation when kinetic energy is used as the parameter of indicating power operation and is used for motion-impeding operating load total amount, also can be according to the mode identical estimating engine rotation stop position accurately with second to the 4th embodiment.

In addition, in second to the 5th embodiment,, also can calculate rotational speed by additive method though can calculate instantaneous rotational speed according to output gap (for example 30 ° of CA) the required time cycle of crank angle signal CRS.

And though each TDC carries out the calculating of the engine revolution stop position of estimation, and hypothesis also can utilize any crankangle as the timing of calculating by 720 ° of CA are carried out calculating divided by the resulting interval of the number of cylinder.

And, though the stroke state of each cylinder in the time of motor can being stopped (for example suction stroke cylinder and compression stroke cylinder), also can be stored the scope of the crankangle in the engine revolution stop position for example as the estimation result of engine revolution stop position storage.

And, be redefined for fixed value though can will stop determined value Nth, Eth in second and third and five embodiments, the parameters C stop that can also be in these embodiments be used to hinder power operation with the mode basis similar to the 4th embodiment calculates and stops determined value Nth, Eth.

(the 6th embodiment)

With reference to Figure 24-27 explanation the 6th embodiment, wherein the present invention is applied to the estimation that engine rotary speed reduces in stopping process.In addition, the estimation of the engine rotary speed among the 6th embodiment is used for the estimation of one or more cylinder of compression stroke when motor stops.

As shown in figure 24, the 6th embodiment's engine control system with other embodiment in identical mode (Fig. 1 and 11) constitute.

According to the 6th embodiment, shown in the time diagram of Figure 25, kinetic energy in the future and engine rotary speed are in the future estimated.At each TDC, the formula (11) below utilizing calculates kinetic energy E.By estimation in the past for the first time (i+1) locate kinetic energy with i TDC place, and convert them to engine rotary speed, can estimate the engine rotary speed of (i+1) individual TDC.

E＝J×2π ²×Ne ² (11)

Here, E represents the kinetic energy at TDC place, and J represents the moment of inertia that each motor is determined, for J, has used by compatibility etc. and has calculated a value in advance.Ne represents the instant engine rotational speed at TDC place.

According to engine rotary speed estimation program shown in Figure 26, carry out the estimation of engine rotary speed.Each TDC repeats this program.When program begins, in step 6101, calculate the instantaneous rotational speed Ne (i) at current TDC place according to crank angle signal CRS, use formula (11) to calculate the kinetic energy E (i) at current TDC place below in the step 6102.Processing in the step 6102 is used as the Kinetic Energy Calculation means.

Then, handle entering step 6103, the formula (12) below utilizing calculates and is used for motion-impeding work load W.In the 6th embodiment, as the condition of motor stopping period, the driving loss in the pumping loss in the each several part, frictional loss and each auxiliary device all is considered to be used for motion-impeding work load W.

W＝E(i-1)-E(i) (12)

Here, E (i-1) expression utilizes past that formula (11) calculates kinetic energy at the TDC place in the stroke for the first time.The processing of step 6103 is used as work load and calculates means.In this case, be the factor that kinetic energy reduces owing to only being useful on motion-impeding merit, therefore kinetic energy E (i-1) in the stroke first time in utilization past and the difference of current kinetic energy E (i) are represented work load W.

Under the slow-speed of revolution operational condition of motor stopping period, drive loss in pumping loss in the each several part, frictional loss and each auxiliary device all is considered and thinks motion-impeding work load W, as shown in figure 27, suppose that they have and the irrelevant substantially invariable value of engine rotary speed.Therefore, the kinetic energy that has of the TDC of motor 11 in the 1st stroke in the future motion-impeding work load W that is used for that reduced to calculate in the step 6103.Therefore, the formula (13) below using in step 6104 calculates the predicted value E (i+1) of the kinetic energy at TDC place in first stroke from now on.

E(i+1)＝E(i)-W (13)

Processing in the step 6104 is used as Kinetic Energy Calculation means in the future.

Then, in subsequently a step 6105, use obtain by modification formula (11) below formula (14) be calculated as the instantaneous rotational speed Ne (i+1) at TDC place in first stroke from now on.

$\mathrm{Ne}(i+1)=\sqrt{\frac{E(i+1)}{J\&times;{2\mathrm{\&pi;}}^2}}---\left(14\right)$

Processing in the step 6105 is used as the rotational speed estimation means.

The kinetic energy in the future that above-mentioned processing can estimating engine 11 has, and estimate engine rotary speed in the future according to the predicted value of kinetic energy.

In addition, the 6th embodiment has illustrated the situation in motor stopping period (slow-speed of revolution interval), at this motor stopping period, multiple loss is thought of as is used for motion-impeding work load, and suppose that they have substantially invariable value, influential one or more parameter of the variation of loss be can be used to realize proofreading and correct, thereby can be under the situation of not considering the rotational speed interval, even since for example oil-break etc. make the process that engine rotary speed reduces between height/middling speed Rotary District, when the loss that is thought of as motion-impeding work load changes, also can estimate kinetic energy in the future.

And, though use engine rotary speed to calculate kinetic energy, in explosive motor, also can use with other rotational speed value that for example crankshaft angular speed is relevant with piston movement speed and calculate.

And, though the motor stopping period that burning in the motor has been stopped being illustrated, but also can be by being used for estimating that the means by the burning energy that obtains add the means that are used to calculate the means of current kinetic energy and are used to calculate motion-impeding work load, estimate the kinetic energy in future in power operation, in this power operation, burn.At this moment, can by consider in each cylinder inner cylinders pressure, suction press, air inflow, give gas, fuel injection amount, firing time, air-fuel ratio wait and estimate the energy that is obtained by burning.

And, though according to the current kinetic energy that calculates and be used for motion-impeding work load estimate in the future the first time stroke kinetic energy, but, the also kinetic energy that can estimate farther future according to the kinetic energy and the motion-impeding work load in the future that estimates.

And, though by a moment at each TDC, for example be used to moment of calculating/estimating, calculate kinetic energy, calculate motion-impeding work load and estimation kinetic energy in the future can estimate in the future the first time kinetic energy in the stroke predicted value, but, the time span that is used to estimate is not limited to each TDC and each stroke, and any moment and cycle any time can.

(the 7th embodiment)

According to the 7th embodiment, utilize engine rotary speed estimation program shown in Figure 28 to estimate engine rotary speed in the future, rather than utilize the moment of inertia J.

Be used to revise formula (12) as the formula (11) of Kinetic Energy Calculation formula thus following formula (15) is provided, this formula (12) is the formula that is used to calculate motion-impeding work load.

$\frac{W}{J\&times;{2\mathrm{\&pi;}}^2}=\mathrm{Ne}{(i-1)}^2-\mathrm{Ne}{\left(i\right)}^2---\left(15\right)$

The left term of formula (15) is the amount C that the expression rotational speed reduces, and it can be limited by following formula (16)

$C=\frac{W}{J\&times;{2\mathrm{\&pi;}}^2}---\left(16\right)$

Rotational speed reduces C and utilizes following formula (17) to calculate, and this formula (17) comes replacement formula (15) to obtain by utilizing formula (16).

C＝Ne(i-1) ²-Ne(i) ² (17)

Here, the instantaneous rotational speed of the current TDC of Ne (i) expression, Ne (i-1) is illustrated in over the instantaneous rotational speed at TDC place in the stroke first time.

As mentioned above, under the slow-speed of revolution operational condition of motor stopping period, can think to have constant value with being used for motion-impeding work load W.And, since the moment of inertia J have for each motor exclusive steady state value, the therefore steady state value that the rotational speed reduction C that is limited by formula (16) has and engine rotary speed is irrelevant.Therefore, the instantaneous rotational speed Ne (i+1) for TDC place in first stroke has from now on reduced the rotational speed reduction C that is calculated by formula (16).

Below formula (18) be used for calculating in the future the first time stroke the predicted value Ne (i+1) of instantaneous rotational speed at TDC place.

$\mathrm{Ne}(i+1)=\sqrt{\mathrm{Ne}{\left(i\right)}^2-C}---\left(18\right)$

Repeat the calculating of the predicted value Ne (i+1) of above-mentioned instantaneous rotational speed at each TDC place according to engine rotary speed estimation program shown in Figure 28.When program begins, in step 7201, calculate the instantaneous rotational speed Ne (i) at current TDC place according to crank pulse signal CRS.Then, handle to enter step 7202, utilize formula (17) to calculate rotational speed reduction C, enter step 7203 then, utilize formula (18) to calculate at predicted value Ne (i+1) for the instantaneous rotational speed at the TDC place in first stroke from now on.

Since calculate among the 7th embodiment method of the predicted value Ne (i+1) of instant engine rotational speed can be only according to the instantaneous rotational speed Ne (i) of current TDC and in the past in the stroke first time the instantaneous rotational speed Ne (i-1) at TDC place calculate the predicted value Ne (i+1) of instant engine rotational speed, and do not need to use motor exclusive the moment of inertia J, therefore be used for by compatibility etc. obtain motor man-hour of exclusive the moment of inertia J will no longer need, thereby can shorten debug time.

In addition, the number of times of required calculating also can reduce till estimating instant engine rotational speed in the future, and the amount of calculation among the CPU of ECU30 also can reduce.And, utilize compatibility etc. to obtain the moment of inertia J owing to use, therefore can be under the situation that not influenced by the motor manufacturing tolerances, estimation instant engine rotational speed in the future more accurately.

In addition, can utilize formula (17) to come the right item of replacement formula (18), thereby formula (18) is revised as following formula (19), this formula (19) only can be used for according to current instantaneous rotational speed Ne (i) and the instantaneous rotational speed Ne (i-1) in the stroke for the first time in the past, calculate the predicted value Ne (i+1) of instant engine rotational speed, and do not need to calculate rotational speed reduction C.

$\mathrm{Ne}(i+1)=\sqrt{2\mathrm{Ne}{\left(i\right)}^2-\mathrm{Ne}{(i-1)}^2}---\left(19\right)$

Though in the above-mentioned the 6th and the 7th embodiment, estimated engine rotary speed in the future, also can use identical method to estimate in the explosive motor and rotational speed, for example crankshaft angular speed other values relevant with piston movement speed.

And, though in the 7th embodiment, use and considered that the value of the moment of inertia J is as rotational speed reduction C (variable quantity of the value relevant with rotational speed), consider the variable that is used as the value relevant with the value of the quality of rotating relevant part and the diameter that rotatablely moves but also can use with rotational speed, the quality of these parts for example is piston, connecting rod, crankshaft etc., and these diameters that rotatablely move for example are the radiuses of crankshaft.

In addition, the present invention is not limited to four, also can be used for three or cylinder engine still less, and perhaps five or multiple cylinder engine more, the present invention is not limited to tuned port injection motor shown in Figure 1, also can be applicable to in-cylinder injection motor and lean-burn engine.

Claims (15)

1. engine revolution stop position control apparatus comprises:

The motor arresting stop, be used for according to motor cease and desist order stop to light a fire and fuel sprays at least one, rotate with shutting engine down;

First parameter calculation apparatus is used to calculate a parameter of the representative power operation that this motor exists after ceasing and desisting order;

Second parameter calculation apparatus is used to calculate the parameter that is used to hinder power operation that this motor is ceased and desisted order and existed afterwards;

Rotation stop position estimating device, the parameter of the representative power operation that calculates by first parameter calculation apparatus and second parameter calculation apparatus respectively after being used for ceasing and desisting order and be used to hinder the parameter of power operation, estimating engine rotation stop position during the rotation of motor arresting stop shutting engine down according to this motor.

2. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

It is to stop any one generation in the opening signal by ignition switch shutdown signal and idle running that motor is ceased and desisted order.

3. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

In the first parameter calculation apparatus calculation engine kinetic energy, rotational speed, crankshaft angular speed, the piston movement speed at least one is as the parameter of representing the motor motion.

4. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

First parameter calculation apparatus calculates representative by with the parameter of 720 ℃ of A divided by the motion of each crankangle part that number obtained of cylinder.

5. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

First parameter calculation apparatus calculates and is calculating momentary value constantly.

6. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

In the driving loss in pumping loss, frictional loss and each auxiliary device in the second parameter calculation apparatus calculation engine each several part at least one is as motion-impeding parameter.

7. engine revolution stop position control apparatus as claimed in claim 6 is characterized in that:

Second parameter calculation apparatus consider the quality of the part relevant with power operation and rotatablely move diameter and engine inertia amount at least one, and calculate motion-impeding parameter.

8. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

Second parameter calculation apparatus calculates at least during motor stops the rotation and once is used for motion-impeding parameter.

9. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

The parameter of the parameter of the representative campaign that second parameter calculation apparatus this time calculates according to first parameter calculation apparatus and the representative campaign of last computation is calculated the amount of obstruction power operation.

10. engine revolution stop position control apparatus as claimed in claim 1 is characterized in that:

Second parameter calculation apparatus calculates the amount of the obstruction power operation in a crankangle, and this crankangle is by obtaining 720 ℃ of A divided by the cylinder number.

11., it is characterized in that as any one described engine revolution stop position control apparatus among the claim 1-10:

The parameter of the representative campaign that rotation stop position estimating device this time calculates according to first parameter calculation apparatus and be used for motion-impeding parameter and estimate that one represent the parameter of motion in the future, and come estimating engine to rotate stop position according to the predicted value of represent parameter of moving future.

12. engine revolution stop position control apparatus as claimed in claim 11 is characterized in that:

Rotation stop position estimating device utilizes a crankangle partly to estimate and represents the parameter of motion in the future, and this crankangle is by obtaining 720 ℃ of A divided by the cylinder number.

13. engine revolution stop position control apparatus as claimed in claim 11 is characterized in that:

Rotation stop position estimating device is according to the predicted value of representing the parameter of moving in the future and be used for motion-impeding parameter, the parameter of the motion in the future that the estimation representative is farther.

14. engine revolution stop position control apparatus as claimed in claim 11 is characterized in that:

When the predicted value of representing the parameter of motion in the future during less than predetermined value, the rotation of rotation stop position estimating device estimating engine will stop before having the crankangle of this predicted value.

15., it is characterized in that as any one described engine revolution stop position control apparatus among the claim 1-10:

Rotation stop position estimating device comes calculation engine to stop determined value according to the motion-impeding parameter that is used for that second parameter calculation apparatus calculates, and during the rotation of motor arresting stop shutting engine down, the parameter of the representative campaign that first parameter calculation apparatus is calculated and this motor stop determined value and compare, with estimating engine rotation stop position.

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