CN1306158C

CN1306158C - Suction-flow controlling device of IC engine

Info

Publication number: CN1306158C
Application number: CNB2003101181260A
Authority: CN
Inventors: 露口诚; 平方良明
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2002-12-02
Filing date: 2003-11-25
Publication date: 2007-03-21
Anticipated expiration: 2023-11-25
Also published as: EP1431553A2; EP1431553B1; CN1508414A; CA2449147C; CA2449147A1; TWI231839B; JP2004183541A; BR0305302A; BR0305302B1; EP1431553A3; TW200417683A; ES2430822T3; MXPA03011038A

Abstract

The object of the present invention is to provide an intake air flow control system for an internal combustion engine with which it is possible to prevent a rise in cost and to prevent adverse effects on the starting characteristics of the internal combustion engine. The solution of the present invention is that at the time of performing a reference position adjustment of an auxiliary intake air flow control valve, when both a first re-reading condition where the absolute value of the difference between a target idling engine speed and a current idling engine speed is smaller than a first threshold and a second re-reading condition where the absolute value of the difference between a calculated intake flow rate and a reference intake flow rate is greater than a second threshold are established, step S5 is performed in which a valve opening corresponding to the reference intake flow rate on a reference characteristic basis is used in place of a valve opening corresponding to the calculated intake flow rate.

Description

The inspiratory flow control gear of internal-combustion engine

Technical field

The present invention relates to a kind of inspiratory flow control gear of internal-combustion engine, relate in particular to and to prevent that cost from rising and prevent inspiratory flow control gear to the baneful influence of starting characteristic and the internal-combustion engine deposited.

Background technique

As the inspiratory flow control gear of this class internal-combustion engine, throttle valve is carried out bypass the structure of the auxiliary air-breathing stream with suction control valve also is set for generally known.And according to this inspiratory flow control gear, the aperture of the suction control valve when controlling zero load can be regulated the auxiliary inspiratory flow that flows through auxiliary air-breathing stream, and be made engine speed consistent with the no-load speed as target.

For the driven for opening and closing of described suction control valve, for example can use stepper motor.Valve opening when making this stepper motor consistent with base position is remembered in advance in the storage of electronic control unit (ECU), and with the command value of increase and decrease for this base position, can access valve opening arbitrarily.

In ECU, decide the target valve aperture (being the auxiliary inspiratory flow of target) of suction control valve by detection of engine rotating speed etc., can calculate the command value that supply with stepper motor in view of the above.But owing to the reasons such as long-term variation of stepper motor, valve opening can be offset.

In order to eliminate this class skew, periodically regulate the reference position, that is, need forcibly carry out ECU is looked the valve opening base position adjusting consistent of the Aspirating valves control of recognizing with actual valve opening.

Thus, in following patent documentation 1, proposed at once stepper motor to be switched on after turning off ignition switch, suction control valve has been moved to full close position or fully open position, with the reference position of this valve position as valve control.

In addition, in following patent documentation 2, proposed to stop the mobile suction control valve in back to half-open position, with the reference position of this valve position as valve control at motor.

Patent documentation 1: special public clear 63-42106 communique

Patent documentation 2: the spy opens flat 6-307267 communique

Yet, in above-mentioned

patent documentation

1 and 2 any one, owing to need when motor stops, making the stepper motor action, so the drive circuit that need keep the action power of ECU, and need be used to prevent the discharging fully of storage battery, be the functions such as time circuit that battery is used up.Like this, have and make circuit structure complicated and cause the problem that cost rises.

For fear of the problems referred to above, can consider to carry out the adjustment of suction control valve reference position at once behind the engine start, but in the case, for example be the reference position with the full close position, then because the deficiency generation poor starting of inspiratory flow (starting time is long, starts back device stall etc.).And, when being the reference position, can bring inspiratory flow excessive with the fully open position, the machine action is undesired.

Summary of the invention

The present invention is the invention in view of above situation, and its purpose is to provide a kind of inspiratory flow control gear that prevents the cost rising and the internal-combustion engine startability is not produced the internal-combustion engine of baneful influence.

In order to solve described problem, the present invention adopts following method.

Promptly, the inspiratory flow control gear of the present invention's 1 described internal-combustion engine, drive at auxiliary air-breathing stream with by stepper motor with the throttle bypass that will in main air-breathing stream, be provided with and control flows cross the auxiliary inspiratory flow control valve of described auxiliary inspiratory flow of assisting air-breathing stream and store the valve opening of this auxiliary inspiratory flow control valve in advance and the inspiratory flow control gear of the datum characteristic between described auxiliary inspiratory flow in, it is characterized in that:

When zero load, obtain

The absolute value of the difference between target no-load speed and the current no-load speed less than first of first threshold change the condition of reading and

To being used to obtain the described auxiliary inspiratory flow of described target no-load speed, the absolute value of the difference between computing inspiratory flow of obtaining according to computing and the benchmark inspiratory flow obtained according to described datum characteristic changes the condition of reading greater than second of second threshold value;

First change the condition of reading and second and change the condition of reading when all setting up at this, replace and the corresponding valve opening of described computing inspiratory flow, and use the reader of changing along described datum characteristic and the valve opening corresponding with described benchmark inspiratory flow.

According to the inspiratory flow control gear of the invention described above 1 described internal-combustion engine, change when reading condition and setting up when the 1st, be judged as current no-load speed near target no-load speed.In addition, change when reading condition and setting up when the 2nd, be judged as auxiliary inspiratory flow control valve occurrence positions skew, need to revise.Then, the 1st change the condition of reading and the 2nd and change the condition of reading when all setting up, compare, the valve opening of corresponding benchmark inspiratory flow is adopted as correct valve opening with the valve opening of corresponding computing inspiratory flow at these.

The inspiratory flow control gear of the present invention's 2 described internal-combustion engines will change by the target stepping position that computing is obtained and be read as the benchmark stepping position of obtaining according to the Reference mass flowmeter.

The Aspirating valves control gear of the present invention's 3 described internal-combustion engines, auxiliary air-breathing stream with the throttle bypass is set in the internal-combustion engine suction system, has the auxiliary inspiratory flow control valve that is connected in stepper motor, opens and closes described auxiliary air-breathing stream simultaneously, it is characterized in that: have judge whether be in the current zero load device and, be judged as be in the current zero load time, carry out described stepper motor the reference position change the device of reading.

The Aspirating valves control gear of 3 described internal-combustion engines according to the present invention is in the zero load time when being judged as now, changes the reference position of reading stepper motor.

Description of drawings

Fig. 1 is an embodiment the side view that expression has the motor bike of internal-combustion engine inspiratory flow control gear of the present invention.

Fig. 2 is the figure of this motor bike major component of expression, is the amplification view of the A portion of Fig. 1.

Fig. 3 is the explanatory drawing that the summary of the inspiratory flow control gear of this motor bike of expression constitutes.

Fig. 4 is the explanatory drawing of this inspiratory flow control gear action of explanation

Fig. 5 is the figure that is illustrated in the last table that writes down of ECU of this inspiratory flow control gear, (a) be the water temperature chart that is illustrated under a certain water temperature to the air mass flow that obtains the regulation engine speed, (b) be relevant standard flow chart between aperture and the auxiliary inspiratory flow that this flows through constantly of expression by-pass valve, solid line is the valve characteristic of factory when dispatching from the factory, and dotted line is the valve characteristic when parallel offset taking place when dispatching from the factory for factory.

Fig. 6 is the explanatory drawing of the control flow of this inspiratory flow control gear of expression.

Fig. 7 has represented the part of the control flow of this inspiratory flow control gear, (a)～(c) subroutine of the step S1 of presentation graphs 6～S3 in detail.

Fig. 8 has represented the part of the control flow of this inspiratory flow control gear, (a)～(c) subroutine of the step S4 of presentation graphs 6～S6 in detail.

Among the figure: the air-breathing stream of 32a-master, the 32-throttle valve, 42-assists air-breathing stream, 43-by-pass valve (auxiliary inspiratory flow control valve), 44-stepper motor.

Embodiment

Below with regard to an embodiment of internal-combustion engine inspiratory flow control gear of the present invention, be illustrated in conjunction with the accompanying drawings, still, the present invention is not limited to this example certainly.And in the present embodiment, though explanation is example when applying the present invention to motor bike, much less the present invention can be applied to other vehicles too.

As Fig. 1 and shown in Figure 2, the motor bike 1 of present embodiment is that the seat 2 with the two-seater bit-type is used for protecting cover, the structure of the small-sized two-wheel of configuration power plant 4 under the long trunk 3 of fore-and-aft direction.Power plant 4, have piston-cylinder unit 6 with the motor (internal-combustion engine) 5 that turns forward significantly and the stepless speed variator 8 that is connected with respect to a side of the crankcase 9 of this motor 5, speed change body 10 one that will rearward extend, and supporting trailing wheel (driving wheel) 11 with axle at the rear portion of speed change body 10.

As shown in Figure 2, on the cylinder head 7 that is engaged in described piston-cylinder unit 6 front ends, be provided with upstream extremity to the intakeport 7a of car body rear opening with to the Fuelinjection nozzle 7b of the downstream burner oil of this intakeport 7a.And,, connecting inspiratory flow is supplied with in inspiratory flow control gear 21 from control to motor 5 at the upstream extremity of intakeport 7a.

Shown in Figure 3, this inspiratory flow control gear 21 comprises: have the throttle valve 31 of the air-breathing stream 32a of master that is communicated with described intakeport 7a and be provided with the idler valve 41 that makes a circulation in the auxiliary air-breathing stream 42 of this throttle valve 31.

Throttle valve 31, as Fig. 2 and shown in Figure 3, have: the throttle valve body 32 that forms the tubular of main air-breathing stream 32a in inside, with the inside that is arranged on this throttle valve body 32 and open and close the throttle 33 of main air-breathing stream 32a and to the driving force transfer mechanism (not shown) of these throttle 33 transmission of drive force.At the upstream extremity of throttle valve body 32, connect air-strainer 23 by aspirating air pipe 22.In addition, in the downstream of throttle valve body 32, be connected in described cylinder head 7 by connecting tube 24.Then, on the sidewall of throttle valve body 32, form with the bypass inlet 32b that leans on the air-breathing stream 32a of master of upstream side to be communicated with than throttle 33 with the bypass of leaning on the air-breathing stream 32a of master in downstream side to be communicated with and export 32c than throttle 33.

Idler valve 41 has: one is fixed on the housing 46 on the throttle valve body 32, with be formed in this housing 46, throttle 33 bypasses (make a circulation) described assisted air-breathing stream 42 by being communicated with in throttle valve body 32 outsides between bypass inlet 32b and the bypass outlet 32c, cross this by-pass valve of assisting the auxiliary inspiratory flow of air-breathing stream 42 (auxiliary inspiratory flow control valve) 43 with control flows, with the stepper motor 44 that drives this by-pass valve 43, the electronic control unit that is transformed to the power transfering part 45 of advance and retreat driving force of by-pass valve 43 and control step motor 44 with rotary driving force with this stepper motor 44 is (not shown.To call ECU in the following text).

On housing 46, be formed with the auxiliary air-breathing inlet 46a that is communicated in bypass inlet 32b, with the auxiliary air-breathing outlet 46b that is communicated in bypass outlet 32c, and will be communicated with and insert the valve opening 46c of by-pass valve 43 between these auxiliary air-breathing inlet 46a and the auxiliary air-breathing outlet 46b.

By-pass valve 43 is provided with: the 1st valve opening 43b that have the drum of general hollow, forms at its front end and be formed on the sidewall and be communicated in the 2nd valve opening 43b and the 3rd valve opening 43c of the 1st valve opening 43a.Then, this by-pass valve 43, in when action of advancing and retreat in valve opening 46c, the size of the basal area that is communicated with stream of formation can be controlled auxiliary inspiratory flow when overlapping with auxiliary air-breathing outlet 46b according to the 2nd valve opening 43b and the 3rd valve opening 43c.Therefore, corresponding to the advance and retreat position of the by-pass valve in the valve opening 46c 43, can control auxiliary inspiratory flow to motor 5.

That is, shown in the lower-left figure of Fig. 4, when the original state of ato unit 5,, make the standard-sized sheet open area of the 2nd valve opening 43b and the 3rd valve opening 43c coincide with the opening area of assisting air-breathing outlet 46b in order to allow the inspiratory flow of motor 5 be maximum.In view of the above, shown in this curve above figure, the aperture (IACV aperture) of idler valve 41 is made as maximum, can improves engine speed (ENG rotating speed).

During warm-operation after startup, shown in central figure below of Fig. 4, make the part of the 3rd valve opening 43c and the 2nd valve opening 43b be communicated in auxiliary intakeport 46b.Like this, shown in this curve above figure, can be with the valve opening of aperture (IACV aperture) when being adjusted to warm-operation of idler valve 41.

And then, during unloaded after this warm-operation, shown in the bottom-right graph of Fig. 4, the 2nd valve opening 43b closed fully and only make the 3rd valve opening 43e be communicated in auxiliary air-breathing outlet 46b, like this, shown in this curve above figure, can be with the valve opening of aperture (IACV) when being adjusted to zero load of idler valve 41.

As shown in Figure 3, stepper motor 44 forms male thread 44a1 to be fixed in the housing 41 with the coaxial mode of valve opening 46c on its running shaft 44a.And symbol 47 is sealed members, prevents in the valve opening 46c air-breathing in the auxiliary air-breathing stream 42 of external leaks.

Power transfering part 45 is provided with driver part 45a with the tapped hole 45a1 that is threaded with running shaft 44a and by-pass valve 43 is fixed on spring 45b on this driver part 45a.Between driver part 45a and by-pass valve 43, sandwich Ou Shi coupling head 45c, thereby can carry out relative displacement to the radial direction that with these axis is the center.Spring 45b is to the force application part that is formed on the convex shoulder 45a2 application of force on the driver part 45a, so that by-pass valve 43 nothings are fixed on the driver part 45a with rocking to by-pass valve 43.

Described ECU, it is the device of the number of steps of control step motor 44, store the barometer that is used to find the solution the barometric pressure correction factor, with determine the water-thermometer of auxiliary inspiratory flow (referring to Fig. 5 (a) based on the temperature of the cooling water of cooled engine 5, have when starting, each operating mode in service), and the Reference mass flowmeter of the decision valve opening of by-pass valve 43 and the datum characteristic between the auxiliary inspiratory flow (that is, stepper motor 44 being regulated stepping position when consistent with the reference position and the characteristic between the mass flow rate) is (referring to the thick line of Fig. 5 (b).Transverse axis [IACV] expression valve opening) and be illustrated in the volume flow scale of the stepping position of the stepper motor 44 of necessity when obtaining a certain volume flowrate.

Then, this ECU can read in not shown atmospheric value, cooling water water temperature with atmosphere pressure sensor mensuration.

Below, for described inspiratory flow control gear 21 (below, control flow IACV) is illustrated with reference to Fig. 6～Fig. 8.Here, Fig. 6 represents the summary of this control flow, and Fig. 7 and Fig. 8 represent to pay with in the subroutine of control flow shown in Figure 6.In following explanation, establishing no-load speed is INE, and the rotating speed of target of motor is target NE.In addition, in no-load speed, the no-load speed that will obtain is as current INE, and the no-load speed of obtaining at the back of now is as INE last time, the current no-load speed of being tried to achieve by actual measurement is decided to be current NE, with the no-load speed measured for back in time as NE last time.

(1) flow process of step S1

When ignition mechanism is made as connection, beginning IACV control, at first obtain the barometric pressure correction factor at step S1.That is, shown in the subroutine of Fig. 7 (a),,, calculate barometric pressure correction factor corresponding to the atmospheric value of measuring with described atmosphere pressure sensor with reference to the described barometer of on ECU, storing at step S1-1.Like this, after trying to achieve the barometric pressure correction factor,, then enter the step S2 of Fig. 6 if start or in service.In addition, when zero load, enter the step S3 of Fig. 6.

(2) flow process of step S2

When entering step S2, obtain startup or operating air-breathing mass flow rate.That is, shown in Fig. 7 (b), enter step S2-1 during startup, in described each water-thermometer of ECU, the water-thermometer of using when starting, the mass flow rate when calculating the startup corresponding to the water temperature of measuring with described cooling-water temperature sensor.On the other hand, enter step S2-2 when being in operation, in described each water-thermometer of ECU,, calculate operating mass flow rate corresponding to the water temperature of measuring with described cooling-water temperature sensor with reference to the water-thermometer of described usefulness in service.Like this, after trying to achieve startup or operating air-breathing mass flow rate, the step S3 that skips Fig. 6 enters step S4.

(3) flow process of step S3

When entering step S3, obtain unloaded required mass flow rate.That is, shown in Fig. 7 (c),, calculate error as the current NE that measures and the absolute value of the difference between the target NE at step S3-1.Then at step S3-2, calculate as the current NE and the difference delta NE of the absolute value of the difference of NE last time.Further, then at step S3-3, according at step S3-1, described error of obtaining respectively among the S3-2 and difference delta NE calculate the PID mass flow rate.Then at step S3-4,, calculate INE mass flow rate for this INE will be added on mutually in the PID mass flow rate that step S3-3 calculates and the corresponding mass flow rate of INE last time.Like this, after obtaining current INE mass flow rate, enter the step S4 of Fig. 6.

(4) flow process of step S4

At step S4, when obtaining the startup of trying to achieve corresponding to step S2 operating mass flow rate or step S3 obtain unloaded the time the stepping position of motor of mass flow rate (INE mass flow rate).That is, shown in Fig. 8 (a), at first when step S4-1 judges whether to be startup.If when starting, then enter step S4-2, the mass flow rate when starting with the barometric pressure correction that the barometric pressure correction factor that uses step S1-1 to try to achieve carries out, is calculated the volume flowrate when starting.Then, go up the described volume flow scale of storage, the target stepping position of volume flowrate when calculating corresponding to the startup of trying to achieve at step S4-2 with reference to ECU at step S4-3.Like this, after obtaining the target stepping position, the step S5 that skips Fig. 6 enters step S6.

On the other hand, under step S4-1 is judged as situation when not being to start, judge whether it is in service at step S4-4.Then, be under the operating situation being judged as, enter step S4-5, in addition, under the situation in being judged as zero load, enter step S4-7.

When entering step S4-5, operating mass flow rate so that be used in the barometric pressure correction that barometric pressure correction factor that step S1-1 tries to achieve carries out, is calculated operating volume flowrate.Then,, calculate target stepping position corresponding to the volume flowrate of obtaining at step S4-5 in service with reference to the described volume flow scale that writes down among the ECU at step S4-6.Like this, after obtaining the target stepping position, the step S5 that skips Fig. 6 enters step S6.

On the other hand, if in step S4-4, be judged as in the inoperative, then as entering step S4-7 in the zero load.Then, unloaded mass flow rate (INE mass flow rate) so that be used in the barometric pressure correction that barometric pressure correction factor that step S1-1 tries to achieve carries out, is calculated unloaded volume flowrate (INE volume flowrate).Then,, calculate target stepping position corresponding to the unloaded volume flowrate of trying to achieve at step S4-7 with reference to the described volume flow scale that in ECU, writes down at step S4-8.Like this, after obtaining the target stepping position, enter the step S5 of Fig. 6.

(5) flow process of step S5

At step S5, change the condition of reading and the 2nd and change the occasion that the condition of reading is all set up when the following the 1st, carry out the changing of reference position of described stepper motor 44 and read.Promptly, current no-load speed near situation as the no-load speed of target under, change the reference position (, in the time of in being judged as current zero load, carrying out the changing of reference position of stepper motor 44 and read) of reading stepper motor 44 by whether being the ECU of the device in the zero load as judging now.

Be described in detail as follows, shown in Fig. 8 (b), at first in step S5-1, when being judged to be in the threshold value (1st threshold value) of described error that step S3-1 tries to achieve (target no-load speed and with the absolute value of the difference of the detected current no-load speed of impulser) less than regulation, change the condition of reading as the 1st and set up, enter step S5-2.Change the condition of reading when being false when the 1st, do not change and read and enter the step S6 of Fig. 6.

When entering step S5-2, use the barometric pressure correction factor of trying to achieve at step S1-1, the described Reference mass flowmeter in the ECU is carried out the barometric pressure correction, calculate the base volume flow with this.Then,, calculate target stepping position a corresponding to the base volume flow of trying to achieve at step S5-2 with reference to the described volume flow scale in the ECU at step S5-3.Then, calculate the target stepping position b suitable with the INE volume flowrate from described volume flow scale at step S5-3a.

Then at step S5-4, calculate the absolute value of the target stepping position a that tries to achieve at step S5-3 and the difference of the target stepping position b that tries to achieve at step S5-3a, when judging this value greater than defined threshold (the 2nd threshold value), at step S5-5, when be judged as less than the time enter the step S6 of Fig. 6.Promptly, at step S5-4, to being used to obtain the auxiliary inspiratory flow of target no-load speed, when the absolute value of the computing inspiratory flow of trying to achieve and the difference of the benchmark inspiratory flow of trying to achieve according to described Reference mass flowmeter (datum characteristic) during, change the condition of reading and enter step S6 as reaching the 2nd greater than the 2nd threshold value according to computing.

When entering step S5-5, the target stepping position that will try to achieve at step S5-3a changes and is read as the target stepping position of trying to achieve at step S5-3.

That is,, change and be read as the benchmark stepping position a (corresponding to the valve opening of the benchmark inspiratory flow on the datum characteristic) that obtains according to described Reference mass flowmeter the target stepping position b (corresponding to the valve opening of computing inspiratory flow) that computing is obtained.If further describe, then shown in Fig. 5 (b), valve characteristic when the factory shown in the solid line dispatches from the factory, when becoming the IACV aperture that parallels with valve characteristic that is represented by dotted lines through reason such as long-term variation and be moved, the IACV aperture (stepping position) that will be used to obtain same air mass flow replaces the aperture that computing is tried to achieve, and adopts the valve characteristic when being dispatched from the factory by factory and the IACV aperture obtained.For example in the example of this figure,, this value is replaced as ST1 reads though the IACV aperture of being obtained with computing is ST2.Like this, even valve characteristic is offset, also can carry out the correction of software.Like this, implement after changing of target stepping position read, enter the step S6 of Fig. 6.

(6) flow process of step S6

At step S6, on stepping position, drive stepper motor corresponding to the target stepping position of being obtained.Promptly, shown in Fig. 8 (c), in step S6-1, reference is at described step S4-3, S4-6, any target stepping position of obtaining of step of S4-8 or carried out changing the target step value of reading at step S5-5 makes stepper motor 44 rotations, thereby obtain target valve aperture (that is, guarantee as target auxiliary inspiratory flow).

As mentioned above, the inspiratory flow control gear 21 of present embodiment adopts following formation, judging that current no-load speed is near target no-load speed and judge the skew of by-pass valve 43 occurrence positions, need to adjust when consistent with the reference position, with compare for the valve opening of computing inspiratory flow, benchmark is correct valve opening corresponding to the valve opening of inspiratory flow, changes and reads.

According to this formation, owing to be not to carry out when motor 5 stops that the reference position is consistent to be adjusted, thus do not need to be used for keeping when motor 5 stops the drive circuit of action power, and, do not need to be used to the time circuit that prevents that battery from using up yet.Like this, can prevent that circuit from constituting complicated and cost rises.In addition, when carrying out the adjustment consistent, do not need forcibly to make by-pass valve 43 full cut-offs or standard-sized sheet, so can prevent poor starting and rapid vehicle action with the reference position.

Therefore, prevent that cost from rising and prevent that the two can and be deposited to the baneful influence of starting characteristic.

(invention effect)

The inspiratory flow control gear of the present invention's 1 described internal-combustion engine, when the adjusting of the reference position unanimity of assisting the inspiratory flow control valve, the absolute value of the difference between this target no-load speed and present no-load speed makes less than the 1st of the 1st threshold value and changes the condition of reading, and the absolute value of the difference between computing inspiratory flow and the benchmark inspiratory flow makes greater than the 2nd of the 2nd threshold value and changes under the situation that the condition of reading all sets up, replacement is adopted and is used the structure of changing reader corresponding to the valve opening of the benchmark inspiratory flow on the datum characteristic corresponding to the valve opening of computing inspiratory flow.

According to this structure, owing to be not adjusting that when internal-combustion engine stops, carrying out the reference position unanimity, thus the drive circuit that the action power when not needing internal-combustion engine stopped to be kept, and, do not need to be used to the time circuit that prevents that storage battery from using up yet.Like this, can prevent that circuit from constituting the rising of complicated and cost.In addition, owing to adjusting the reference position when consistent, do not need with auxiliary inspiratory flow control valve forcibly full cut-off or standard-sized sheet, so can prevent poor starting.

Like this, according to the present invention, can prevent that cost from rising and for the baneful influence of starting characteristic, the two can and be deposited.

The Aspirating valves control gear of 2 or 3 described internal-combustion engines according to the present invention can access the same effect of inspiratory flow control gear with the present invention's 1 described internal-combustion engine.

Claims

1. the inspiratory flow control gear of an internal-combustion engine, drive at auxiliary air-breathing stream with by stepper motor with the throttle bypass that will in main air-breathing stream, be provided with and control flows cross the auxiliary inspiratory flow control valve of described auxiliary inspiratory flow of assisting air-breathing stream and store the valve opening of this auxiliary inspiratory flow control valve in advance and the inspiratory flow control gear of the datum characteristic between described auxiliary inspiratory flow in, it is characterized in that:

When zero load, obtain

To being used to obtain the described auxiliary inspiratory flow of described target no-load speed, the absolute value of the difference between computing inspiratory flow of obtaining according to computing and the benchmark inspiratory flow obtained according to described datum characteristic changes the condition of reading greater than second of second threshold value:

Described first change the condition of reading and second and change the condition of reading when all setting up at this, replace and the corresponding valve opening of described computing inspiratory flow, and use the reader of changing along described datum characteristic and the valve opening corresponding with described benchmark inspiratory flow.

2. the inspiratory flow control gear of internal-combustion engine as claimed in claim 1 is characterized in that:

To change by the target stepping position that computing is obtained and be read as the benchmark stepping position of obtaining according to the Reference mass flowmeter.