CN101333973B

CN101333973B - Running control device for internal-combustion engine

Info

Publication number: CN101333973B
Application number: CN2008100992459A
Authority: CN
Inventors: 西田宪二
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2007-06-29
Filing date: 2008-05-15
Publication date: 2011-12-28
Anticipated expiration: 2028-05-15
Also published as: CN101333973A; JP2009013792A; ITTO20080340A1; BRPI0803727A2; BRPI0803727B1; JP4875554B2

Abstract

The invention provides an operation control of an internal-combustion engine which controls operation states of the internal-combustion engine by using factors changing with the operation states of the internal-combustion engine as variable control mapping, the factors are angular velocity variation of a crank angle, the operation control of simplifying operation, reducing the number of parts and improving combustion is realized. The front end (6a) and rear end (6b) along the rotation direction of a crankshaft (4) of one trigger (6) of at least one trigger (6) arranged on the crankshaft (4) are correspondingly detected by utilizing the rotation of a pulse generator (7) and the crankshaft (4).

Description

The operation controller of internal-combustion engine

Technical field

The present invention relates to a kind of utilization is that the control mapping (map) of variable comes the operating condition of internal-combustion engine is controlled and the above-mentioned factor is the operation controller of internal-combustion engine of the angular velocity variation of crankangle with the factor that changes according to the operating condition of internal-combustion engine.

Background technique

Patent documentation 1 and patent documentation 2 etc. disclose following technology: for the burnings such as combustion expense improvement that realize internal-combustion engine improve, the result who dopes intake negative-pressure etc. by computing with the intake negative-pressure that determines or according to other measured load is as the factor, and switching controls is shone upon the running control of carrying out internal-combustion engine.

Patent documentation 1: TOHKEMY 2000-265894 communique

Patent documentation 2: TOHKEMY 2004-108289 communique

Summary of the invention

But, in above-mentioned patent documentation 1 and patent documentation 2 disclosed technology, because B/P EGR Back Pressure Transducer EGR and other sensor equipment of in the prediction of intake negative-pressure etc., using, the computing of the more complicated that need constitute by the multiple factor.In addition, for the detection of crankangle, also need to utilize a plurality of triggers (Reluctor) that are arranged on the bent axle to carry out a plurality of pulse detection.Yet,, can also be applied to the low automatic double wheel vehicle of price comparison, and then can realize environmental improvement if can realize the simplification of computing and the minimizing of component number in the running control of the internal-combustion engine that improves that is used for burning.

The present invention In view of the foregoing finishes, and its purpose is to provide a kind of operation controller of internal-combustion engine, and it can be realized having reached the minimizing of the simplification of computing and component number and reach the running control that burning improves.

In order to reach above-mentioned purpose, the invention of the 1st aspect record is a kind of operation controller of internal-combustion engine, the factor that utilization changes with the operating condition owing to internal-combustion engine is the control mapping of variable, come the operating condition of internal-combustion engine is controlled, and the above-mentioned factor is the angular velocity variation of crankangle, it is characterized in that, possess: pulse oscillator (pulser pick-up), export pulse to being arranged on detecting of 1 trigger at least 1 trigger on the above-mentioned bent axle accordingly with the rotation of bent axle along the front end of the sense of rotation of above-mentioned bent axle and rearward end; And arithmetic element, according to the angular velocity variation that calculates above-mentioned crankangle by the detection of above-mentioned front end and above-mentioned rearward end from the interval of the pulse of above-mentioned pulse oscillator output.

In addition, the invention of the 2nd aspect record is except the formation of the invention of the 1st aspect record, it is characterized in that the crankangle before utilizing trigger that above-mentioned pulse oscillator detects above-mentioned front end and above-mentioned rearward end with compression top center is arranged on the above-mentioned bent axle.

In addition, the invention of the 3rd aspect record is except the formation of the invention of the 1st aspect record, it is characterized in that, for the benchmark ignition timing to internal-combustion engine detects, utilize above-mentioned pulse oscillator that the trigger that above-mentioned front end and above-mentioned rearward end detect is arranged on the rotor of generator, this trigger is used for the computing of the angular velocity variation of the detection of said reference ignition timing and above-mentioned crankangle.

Invention according to the record of the 1st aspect, utilize the rotation of pulse oscillator and bent axle accordingly the front end and the rearward end along sense of rotation of 1 trigger to be detected, calculate the angular velocity variation of crankangle according to the interval of the pulse of exporting from this pulse oscillator, utilization is that the control of variable is shone upon the operating condition of internal-combustion engine is controlled with the angular velocity variation, so the factor that can reduce for the operating condition with internal-combustion engine is changed accordingly detects and required component number, and computing is simplified and realization burning improvement.

In addition, according to the invention of the 2nd aspect record,,, can obtain correct angular velocity variation thus so utilize the bigger part of the variation of angular velocity to obtain the angular velocity variation owing to utilize the crankangle before the compression top center to obtain the angular velocity variation.

In addition, invention according to the record of the 3rd aspect, the epitrochanterian trigger that is arranged on generator for the benchmark ignition timing to internal-combustion engine detects is used for the computing of the angular velocity variation of benchmark igniting timing detection and crankangle, so can only use 1 trigger of generator to carry out the running control of internal-combustion engine.Thus, for example only regularly by the detection reference igniting, just can continue to use the internal-combustion engine generator of cheapness of the control of the control of not carrying out firing time and fuel injection amount, be easy to reduce the cost that carries out the internal-combustion engine that runnings such as above-mentioned control firing time and fuel injection amount control control.

Description of drawings

Fig. 1 illustrates the figure that the integral body of operation controller of the 1st embodiment's internal-combustion engine constitutes.

Fig. 2 is the figure that the output relation regularly of trigger and pulse oscillator is shown.

Fig. 3 is the figure of the relation of stroke, trigger and crank angular velocity that internal-combustion engine is shown.

Fig. 4 is the flow chart that the control procedure of control unit is shown.

Fig. 5 is the figure that the control mapping of determining firing time is shown.

Fig. 6 is the figure that near the variation of the crank angular velocity of compression top center is shown.

Fig. 7 illustrates the figure that the integral body of operation controller of the 2nd embodiment's internal-combustion engine constitutes.

Description of reference numerals

4 bent axles

5 rotors

6 triggers

The 6a front end

The 6b rearward end

7 pulse oscillators

11 arithmetic elements

The ACG generator

The EB internal-combustion engine

Embodiment

Below, the embodiments of the invention shown in describe embodiments of the present invention with reference to the accompanying drawings.

Fig. 1～Fig. 6 is the figure that the 1st embodiment of the present invention is shown, Fig. 1 illustrates the figure that the integral body of the operation controller of internal-combustion engine constitutes, Fig. 2 is the figure that the output relation regularly of trigger and pulse oscillator is shown, Fig. 3 is the figure of the relation of stroke, trigger and crank angular velocity that internal-combustion engine is shown, Fig. 4 is the flow chart that the control procedure of control unit is shown, Fig. 5 is the figure that the control mapping of determining firing time is shown, and Fig. 6 is the figure that near the variation of the crank angular velocity of compression top center is shown.

At first, in Fig. 1, in the sucking pipe 1 of 4 circuit internal-combustion engine EA, be provided with vaporizer 2, utilize this vaporizer 2 pairs of suctions air quantity and fuel feed to control, utilize the igniting of igniter plug 3 to make fuel in internal-combustion engine EA internal combustion.

The rotor 5 of generator ACG is fixed on the bent axle 4 of internal-combustion engine EA, on this rotor 5, on the crank angular position of determining by the benchmark ignition timing before the compression top center, be provided with 1 trigger 6, accordingly above-mentioned trigger 6 is detected by pulse oscillator 7 rotation with bent axle 4, the rotation of pulse oscillator 7 and bent axle 4 is exported pulse to detecting along the front end 6a of the above-mentioned trigger 6 of the sense of rotation 13 of bent axle 4 and rearward end 6b accordingly.

Then, pulse oscillator 7 as shown in Figure 2 with the rotation of bent axle 4 export accordingly with to along the pulse of the corresponding rising edge of the detection of the front end 6a of the sense of rotation 13 of above-mentioned trigger 6 and with to pulse along the corresponding trailing edge of the detection of the rearward end 6b of the above-mentioned trigger 6 of above-mentioned sense of rotation 13.Then, in the time of in trigger 6 is set at the scope of angle θ that axis with above-mentioned bent axle 4 is the center, above-mentioned pulse oscillator 7 is with the pulse of the interval output rising edge of crankangle θ and the pulse of trailing edge, if thereby the time between the output regularly of the pulse of rising edge and trailing edge is made as τ, and will be made as ω tdc from the rising edge of pulse oscillator 7 output and the interpulse average angle speed of trailing edge, ω tdc=θ/τ then.

In addition, as shown in Figure 3, crank angular velocity ω in each stroke of 4 circuit each and change, in compression stroke, owing in the firing chamber, produce resistance to compression pression, crank angular velocity ω reduces significantly, in the burning expansion stroke, owing to rising, the pressure in the firing chamber of following burning produces the crank rotating energy, thereby crank angular velocity ω increases significantly, in exhaust stroke, finish and after crank angular velocity ω reached peak value in burning, follow the discharge resistance that produces burnt gas owing to mechanical friction resistance and exhaust, crank angular velocity ω reduces, and then in suction stroke, because the pump work done of generation suction resistance etc., crank angular velocity ω reduces.

And under at the rotational speed Ne of internal-combustion engine EA, promptly with the identical situation of the mean value ω a of the crank angular velocity shown in the dot and dash line of Fig. 3, crank angular velocity ω when high moment of torsion, high suction air quantity is as changing like that shown in the solid line of Fig. 3, crank angular velocity ω when low moment of torsion, low suction air quantity is as changing like that shown in the dotted line of Fig. 3, output torque is high more and the suction air quantity is many more, and the change of crank angular velocity ω is big more.

The output signal of above-mentioned pulse oscillator 7 is imported into electronic control unit 8A, the storage 10A that this electronic control unit 8A possesses CPU 9A and is made of RAM, ROM etc., above-mentioned CPU 9A has: the function of arithmetic element 11, come the revolution of computing internal-combustion engine EA and the angular velocity variation of above-mentioned crankangle according to interval from the pulse of the rising edge of above-mentioned pulse oscillator 7 outputs and trailing edge; And the function of processing unit 12A, determine firing time of above-mentioned igniter plug 3 according to the operation result of this arithmetic element 11.In addition, in storage 10A, store the correction factor mapping that is used for proofreading and correct accordingly the correction factor of firing time in advance with intake air temperature and engine temperature (perhaps cooling water temperature).

Above-mentioned electronic control unit 8A is according to process shown in Figure 4, to controlling the firing time of igniter plug 3, by the processing that above-mentioned arithmetic element 11 is come execution in step S1～step S4, the processing that is come execution in step S5～step S7 by above-mentioned processing unit 12.

In the step S1 of Fig. 4, (ω a) in this embodiment, utilizes the required time T of counting of predetermined times N, calculates from the rising edge of above-mentioned pulse oscillator 7 outputs and a side of trailing edge to calculate the rotational speed Ne of internal-combustion engine EA.That is, ω a=N * 360 °/T, above-mentioned N for example is " 2 ".

In step S2, differentiate compression top center.Herein, from above-mentioned pulse oscillator 7, with the crankangle of the firing time before definite compression top center and the crankangle of the overlapping budc between exhaust stroke and suction stroke, the pulse of output rising edge and trailing edge, as shown in Figure 3, because the crank angular velocity ω of the crankangle before compression top center is less than the mean value ω a of crank angular velocity, and the crank angular velocity ω of overlapping budc is greater than the mean value ω a of crank angular velocity, thus differentiate easily be compression top center from the pulse of above-mentioned pulse oscillator 7 outputs before, or overlapping budc.

In step S3, calculate the angular velocity variation Δ ω of the crankangle of the factor that changes as operating condition owing to internal-combustion engine EA, this angular velocity variation Δ ω is calculated as (Δ ω=ω a-ω tdc).And, the influence that causes for the rotational speed Ne that gets rid of internal-combustion engine EA, above-mentioned angular velocity variation ω wot during full load state (state of maximum throttle opening) with rotational speed Ne when constant removes above-mentioned angular velocity variation Δ ω, thereby calculates the dimensionless number ω of nondimensionalization ^*(=ω tdc/ ω wot).And then in following step S4, carry out above-mentioned dimensionless number ω ^*Smoothing handle.

In step S5, retrieve firing time according to predetermined mapping.Promptly according to above-mentioned dimensionless number ω ^*With the rotational speed Ne of internal-combustion engine EA, prepare mapping shown in Figure 5 in advance and store in the storage 10, in step S5, according to this mapping and according to above-mentioned dimensionless number ω ^*And the rotational speed Ne of internal-combustion engine EA, retrieve firing time.

In following step S6,, for example quicken to proofread and correct and temperature correction to carrying out various corrections the firing time of in step S5, obtaining.Quicken to proofread and correct the correction of the circulation change that is based on angular velocity variation Δ ω, when the angular velocity variation with this is made as Δ ω _n, and the angular velocity variation of last time is made as Δ ω _N-1The time, corrected value k1 is as k1=f (Δ ω _n-Δ ω _N-1) obtain.In addition, temperature correction is based on the correction of intake air temperature and engine temperature (perhaps cooling water temperature), and corrected value k2 is as k2=f{ intake air temperature, engine temperature (perhaps cooling water temperature) } obtain.

And then in step S7, output is the firing time after the correction in step S6, and makes igniter plug 3 igniting in this firing time.

As mentioned above, determine firing time by rotational speed Ne according to angular velocity variation Δ ω and internal-combustion engine EA, need not to calculate the suction air quantity, just can carry out the running control of internal-combustion engine EA, if but use above-mentioned angular velocity variation Δ ω, then can also infer out the suction air quantity simply, below this presuming method be described.

The moment of torsion of internal-combustion engine EA change Δ N is the poor of the clean moment of torsion of internal-combustion engine EA and running resistance moment of torsion, when being made as based on the output torque of the internal-combustion engine EA of in-cylinder pressure N _{Cylindere.work}, the surface friction drag moment of torsion of internal-combustion engine EA is made as N _Friction, the running resistance moment of torsion is made as N _LoadThe time, can use following equation of motion to represent relation with the moment of inertia I of equal value of bent axle 4.

ΔN＝( N _{cylindere.work}-N _friction)-N _load＝I·(dω/dt) ...(1)

Herein, when the pressure in the cylinder is made as P _Cylinder, cylinder bore is made as B, gaseous mass in the firing chamber is made as M, gas constant is made as R, gas kelvin temperature is made as T, the cylinder internal volume is made as V, when the effective radius on the torque arithmetic is made as r,

N _{cylindere.work}＝P _cylinder·(π/4)B ²·r ...(2)

P _cylinder＝M·R·T/V ...(3)

If to having ignored surface friction drag moment of torsion N _FrictionAnd running resistance moment of torsion N _LoadAbove-mentioned formula of above-mentioned formula (1) substitution (2) and formula (3), then

dω/dt＝(1/I)·(M·R·T/V)·(π/4)B ²·r ...(4)

In addition, before compression top center, crank angular velocity ω slows down as shown in Figure 6, the slope of the deceleration before compression top center (d ω/dt) can be similar between 2 before compression top center, time between with 2 o'clock is when being made as Δ τ, if with average crank angular velocity, promptly the angular velocity variation from the rotational speed Ne of internal-combustion engine EA is made as Δ ω, then

dω/dt＝Δω/Δτ ...(5)

So the angular velocity variation Δ ω before the compression top center is the mean angular velocity ω tdc that obtains from the pulse of pulse oscillator 7 outputs that trigger 6 is detected according to utilizing, calculate as (Δ ω=Ne-ω tdc), above-mentioned formula (4) becomes

Δω/Δτ＝M·T·(1/I)·(R/V)·(π/4)B ²·r ...(6)

Herein, when M is the air quantity that is drawn into the firing chamber, and { (1/I) (R/V) (π/4) B ²R} is constant, and when the rotational speed Ne of internal-combustion engine EA is identical, if it is constant supposing Δ τ, Δ ω ∝ MT then, as inlet temperature T when being constant, Δ ω ∝ M can utilize the angular velocity variation Δ ω that obtains according to the pulse of exporting from the pulse oscillator 7 that trigger 6 is detected to infer out the suction air quantity simply.

Next, the effect to the 1st embodiment describes.According to the rotation of bent axle 4 accordingly to being arranged on detecting and from the interval of the pulse of the rising edge of pulse oscillator 7 outputs and trailing edge of 1 trigger 6 on this bent axle 4 along the front end 6a of sense of rotation 13 and rearward end 6b, arithmetic element 11 among the CPU 9A of electronic control unit 8A calculates the rotational speed Ne of internal-combustion engine EA and the angular velocity variation Δ ω of crankangle, operation result according to this arithmetic element 11, it is that the control mapping of variable is determined the firing time of igniter plug 3 operating condition of internal-combustion engine EA to be controlled that processing unit 12A utilizes with angular velocity variation Δ ω, so the factor that can reduce for the operating condition with internal-combustion engine EA is changed accordingly detects and required component number, and computing is simplified and realization burning improvement.

And, because trigger 6 is arranged on the bent axle 4 with the crankangle before the compression top center, so obtain angular velocity variation Δ ω with the crankangle before the compression top center, utilize the bigger part of angular velocity variation Δ ω to obtain the angular velocity variation, can obtain correct angular velocity variation Δ ω thus.

And then, for the benchmark ignition timing to internal-combustion engine EA detects, the trigger 6 that utilizes 7 couples of above-mentioned front end 6a of pulse oscillator and above-mentioned rearward end 6b to detect is arranged on the rotor 5 of generator ACG, and this trigger 6 is used for the computing of the angular velocity variation Δ ω of the detection of said reference ignition timing and crankangle, so can only use 1 trigger 6 of generator ACG to carry out the running control of internal-combustion engine EA.Thus, for example only regularly by the detection reference igniting, just can continue to use the internal-combustion engine generator of cheapness of the control of the control of not carrying out firing time and fuel injection amount, thereby be easy to reduce the cost that carries out the internal-combustion engine EA that runnings such as above-mentioned control firing time and fuel injection amount control control.

Fig. 7 is the figure that the 2nd embodiment of the present invention is shown, and the additional same reference numerals of the part corresponding with above-mentioned the 1st embodiment is illustrated, and omits detailed explanation.

The variable valve system 14 that this internal-combustion engine EB possesses igniter plug 3 and with operating condition acting characteristic changed, in this internal-combustion engine EB, by the sucking pipe 16 of air cleaner 15 cleaned air passes midway to internal-combustion engine EB guiding, dispose throttle valve 17 rotationally, in the downstream side of this throttle valve 17 by Fuelinjection nozzle 18 fueling in above-mentioned sucking pipe 16.In addition, between the outlet pipe 19 of the discharge gas that the sucking pipe 16 and the guiding in the downstream side of above-mentioned throttle valve 17 are discharged from internal-combustion engine EB, be provided with exhaust gas recirculation system 20.

With the rotation of the bent axle 4 of above-mentioned internal-combustion engine EB accordingly, with above-mentioned the 1st embodiment pulse oscillator 7 output pulse signals from single trigger is detected similarly, the output signal of this pulse oscillator 7 is imported into electronic control unit 8B.The storage 10B that this electronic control unit 8B possesses CPU 9B and is made of RAM, ROM etc., above-mentioned CPU 9B has: the function of arithmetic element 11 calculates the revolution of internal-combustion engine EB and the angular velocity variation of crankangle according to the interval from the pulse of the rising edge of above-mentioned pulse oscillator 7 outputs and trailing edge; And the function of processing unit 12B, come injection beginning time of acting characteristic, Fuelinjection nozzle 18 of firing time, variable valve system 14 and emitted dose according to the operation result of this arithmetic element 11 and based on discharge gas re-circulation elapsed time of exhaust gas recirculation system 20 and discharge the gas re-circulation amount and control to above-mentioned igniter plug 3.

Promptly, according to the angular velocity variation Δ ω with the crankangle that calculated according to the output signal of pulse oscillator 7 by the arithmetic element 11 of CPU 9B is the control mapping of variable, control firing time of the igniter plug 3 in the 1st embodiment, also carried out the acting characteristic control of variable valve system 14, the injection beginning time of Fuelinjection nozzle 18 and the control of emitted dose, and based on the discharge gas re-circulation elapsed time of exhaust gas recirculation system 20 and the control of discharging the gas re-circulation amount, thereby the factor that can reduce for the operating condition with internal-combustion engine EB is changed accordingly detects and required component number, and computing is simplified and realization burning improvement.

More than, embodiments of the invention have been described, but have the invention is not restricted to the foregoing description, can under not breaking away from the situation of putting down in writing in claims of the present invention, carry out various design alterations.

For example in the above-described embodiments, the situation that is provided with 1 trigger 6 on bent axle 4 is illustrated, but also can a plurality of triggers be set on bent axle 4, in this case, use 1 computing of carrying out angular velocity variation Δ ω in a plurality of triggers to get final product.

Claims

1. the operation controller of an internal-combustion engine, the factor that utilization changes with the operating condition owing to internal-combustion engine (EA, EB) is the control mapping of variable, come the operating condition of internal-combustion engine (EA, EB) is controlled, and the above-mentioned factor is the angular velocity variation of crankangle, it is characterized in that possessing:

Pulse oscillator (7) is exported pulse to being arranged on detecting along the front end (6a) of the sense of rotation of above-mentioned bent axle (4) and rearward end (6b) of 1 trigger (6) at least 1 trigger (6) on the above-mentioned bent axle (4) accordingly with the rotation of the bent axle (4) of above-mentioned internal-combustion engine (EA, EB); And

Arithmetic element (11), according to the angular velocity variation that calculates above-mentioned crankangle by the detection of above-mentioned front end (6a) and above-mentioned rearward end (6b) from the interval of the pulse of above-mentioned pulse oscillator (7) output,

Wherein, utilize above-mentioned pulse oscillator (7) that the trigger (6) that above-mentioned front end (6a) and above-mentioned rearward end (6b) detect is arranged on the above-mentioned bent axle (4) with the crankangle before the compression top center.

2. the operation controller of an internal-combustion engine, the factor that utilization changes with the operating condition owing to internal-combustion engine (EA, EB) is the control mapping of variable, come the operating condition of internal-combustion engine (EA, EB) is controlled, and the above-mentioned factor is the angular velocity variation of crankangle, it is characterized in that possessing:

Pulse oscillator (7) is exported pulse to detecting along the front end (6a) of the sense of rotation of above-mentioned bent axle (4) and rearward end (6b) of 1 trigger (6) accordingly with the rotation of the bent axle (4) of above-mentioned internal-combustion engine (EA, EB); And

Wherein, for the benchmark ignition timing to internal-combustion engine (EA, EB) detects, utilize above-mentioned pulse oscillator (7) that the trigger (6) that above-mentioned front end (6a) and above-mentioned rearward end (6b) detect is arranged on the rotor (5) of generator (ACG), this rotor (5) is fixed on the above-mentioned bent axle (4), and this trigger (6) is used for the computing of the angular velocity variation of the detection of said reference ignition timing and above-mentioned crankangle.