CN101573529B - A method for preventing internal combustion engine overload - Google Patents

A method for preventing internal combustion engine overload Download PDF

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Publication number
CN101573529B
CN101573529B CN2006800564671A CN200680056467A CN101573529B CN 101573529 B CN101573529 B CN 101573529B CN 2006800564671 A CN2006800564671 A CN 2006800564671A CN 200680056467 A CN200680056467 A CN 200680056467A CN 101573529 B CN101573529 B CN 101573529B
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engine
overheated
ohf
factor
engine speed
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CN101573529A (en
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米卡埃尔·拉松
亨利克·伊森
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Husqvarna AB
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Husqvarna AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/006—Electric control of rotation speed controlling air supply for maximum speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/06—Small engines with electronic control, e.g. for hand held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions

Abstract

The invention relates to a method for preventing an internal combustion engine from harmful engine running, where the engine speed (N) is limited according to a maximum allowed engine speed (NMAX) having a start value (NNORMALMAX), the engine being run at a throttle position from zero throttle to full throttle, where the method comprising the steps of: a. monitoring at least one engine parameter (N, TP, T); b. determining if at least one of the monitored engine parameter(s) satisfies at least one corresponding potential overheat condition (5); c. if the potential overheat condition(s) (5) of step b) is satisfied an overheat factor (OHF) is increased; d. determining if the overheat factor (OHF) exceeds an overheat factor threshold (OHFUMIT); e. if in step d) the overheat factor (OHF) exceeds the overheat factor threshold (OHFL1MIT), the maximum allowed engine speed (NMAX) is reduced to a reduction value (NREDUCEDMAX) during a reduced maximum allowed engine speed period (8, 9, 10), where the reduced maximum allowed engine speed period (8, 9, 10) is active until at least one end reduction period condition (10) is satisfied; f . repeating step a) to e) regularly during the engine run.

Description

Be used to prevent the method for internal combustion engine overload
Technical field
The present invention relates to a kind ofly be used to prevent that internal-combustion engine from the method for harmful engine running taking place, wherein, come the limiting engine rotating speed according to maximum allowed engine speed with initial value (start value).
Background technique
The present invention relates to the restriction than the engine speed N of mini engine, these engine application are in the for example hand held machines of power cutter, chain saw, trimmer, but also are applied to for example mowing machine etc.The machine of these types is with lower sell at competitive, and it is very important therefore controlling cost, and therefore hopes to have the least possible sensor.Because the restriction of size and weight, it also is very important keeping the quantity of sensor the least possible, and especially in hand held machines, and more sensor has increased a risk that breaks down in them.
When motor moved with its optimum performance, engine running had the desired temperatures scope.If engine running gets overheated, possibly cause more serious wearing and tearing so, even damage fully.Therefore, suitable cooling is for the life expectancy that prolongs motor and to improve its runnability be very important.Certainly, the design of the parts in the motor and layout influence the generation and the consequence thereof of heat.Used air, water, oil to take away the heat of critical component.Yet in some cases, only taking away heat, to make it be not enough away from motor, but must influence the generation of heat.
Usually, engine speed is high more, and it is high more that engine temperature becomes.Therefore, many motors are equipped with the engine speed restriction that prevents that motor from turning round more than speed limit.When motor outpaces the limit, can realize this speed limit through post ignition timing (ignition timing) or through stopping igniting.Yet, have as long as not impaired just to allow the outpace speed limit of more improving of the limit of motor will be an advantage to motor.
In US6044822, the electronic control unit of motor increases volume read-out in the process of motion speed greater than predetermined speed, and continues the predetermined running-in time cycle.More specifically, the sensor engine speed, and when rotating speed surpassed idling, electronic control unit increased more oil mass during 5 hours break-in cycle.
Summary of the invention
The purpose of this invention is to provide a kind of dynamic engine speed restriction; Allow the user that motor is turned round under the high-engine rotating speed the short time cycle; But prevent the long time cycle of running under the high-engine rotating speed, to reduce the risk of engine failure.
The objective of the invention is through providing a kind of internal-combustion engine that prevents the method for harmful engine running to take place and reduce the problems referred to above significantly; Wherein, Come the limiting engine rotating speed according to maximum allowed engine speed with initial value; Motor is in the throttle position running from zero throttle to full throttle, and this method may further comprise the steps:
A. monitor at least one engine parameter;
B. at least one parameter in (a plurality of) engine parameter that determines whether to be monitored satisfies at least one corresponding potential overheated condition (potential overheat condition);
If c. satisfy (a plurality of) potential overheated condition of step b), increase the overheated factor so;
D. confirm whether the overheated factor surpasses overheated factor threshold value;
If e. in step d); The overheated factor surpasses overheated factor threshold value; Make maximum allowed engine speed in reducing maximum allowed engine speed period, be decreased to one so and reduce value; Wherein, reduce maximum allowed engine speed period and move (active) always, till satisfying at least one end minus minor cycle condition;
F. in engine operation process, repeating step is a) to e regularly).
And other a kind of internal-combustion engine, comprising:
One or more cylinders;
The ignition mechanism of light up plug;
Control unit of engine comprises the device that is used to monitor at least one engine parameter;
Control unit of engine also comprises the device that is used for coming according to maximum allowed engine speed limiting engine rotating speed (N), and maximum allowed engine speed has initial value;
Wherein, control unit of engine is configured to: (a plurality of) engine parameter of being monitored and at least one potential overheated condition are made comparisons, and, if satisfy this potential overheated condition, then upgrade the overheated factor; The overheated factor and overheated factor threshold value are made comparisons, and wherein,, then make maximum allowed engine speed in reducing maximum allowed engine speed period, be decreased to one and reduce value if the overheated factor surpasses overheated factor threshold value.
Description of drawings
Hereinafter, will describe the present invention in more detail through various embodiments, and wherein, in each accompanying drawing, use identical reference number to represent identical parts with reference to accompanying drawing.
Fig. 1 schematically shows the control unit of engine that is connected to fuel system and Iganition control system;
Fig. 2 shows the flow chart according to control loop of the present invention from principle, and
Fig. 3 is the flow chart that shows the control loop of a third embodiment in accordance with the invention from principle, and
Fig. 4 shows first embodiment of frame " accumulation t1 ".
Embodiment
Fig. 1 schematically shows the ignition system 140 of control motor and the control unit of engine 100 of fuel system 150.Control unit of engine 100 can be: separate unit for example as shown in the figure, for example incorporate in the ignition system 140, and perhaps for example incorporate fuel injection system 150 into.Certainly, ignition system 140 can comprise its control unit of engine separately with fuel injection system 150.
Usually, control unit of engine 100 is carried out a plurality of tasks of control motor, and the present invention relates in these tasks, promptly through having maximum allowed engine speed N MAXCome the engine speed N of limiting engine.Maximum allowed engine speed N MAXBe the upper threshold value of engine speed N, and control unit of engine 100 is controlled at engine speed N and is in this threshold value N basically MAXBelow, promptly engine speed N can surpass threshold value N momently MAXAs stated, if motor turns round with too high engine speed N, motor maybe be impaired so.If especially with the running of high-engine rotational speed N, engine temperature T's motor possibly raise so, and it is too high finally to become continuously, thereby increases the risk of engine failure.
The limiting engine rotational speed N for example through making ignition timing depart from optimum ignition timing, for example through stopping igniting, drops to threshold value N up to engine speed N in several ways MAXTill when following, perhaps for example through only per second commentaries on classics, per the 3rd commentaries on classics etc. stop igniting.
Control unit of engine 100 receives following input parameter; For example from the throttle position TP of (a plurality of) throttle position switch (Throttle Position Sensor, TPS) 120, from the engine speed N of (a plurality of) engine rotation speed sensor 110 and alternatively from (a plurality of) engine temperature T of (a plurality of) temperature transducer 130.For example, temperature transducer 130 can be arranged as the temperature T of measurement from the waste gas of motor, but certainly, can measure engine temperature T in a plurality of different positions.See that from the angle of control measuring engine temperature T will be favourable to confirm whether motor exists overheated risk, but extra sensor has increased cost, therefore many mini engines do not have temperature transducer.Yet engine speed N and/or engine throttle TP can be used to confirm whether motor turns round in overheated risk.
For example, can be through measuring continuous time cycle between the igniting or draw engine speed N twice through the rotational speed of measuring bent axle.In addition, in the application's context, the engine speed N that is monitored also can be through the mean value after some commentaries on classics.The throttle position switch 120 of simple form; A signal only is provided when the throttle of motor top (throttle vault) complete opening or when not opening; Yet, can use more complicated throttle position switch 120 to detect scope certainly from zero throttle to full throttle.
Fig. 2 shows from principle to confirm maximum allowed engine speed N according to the present invention MAXThe flow chart of control loop.
The frame " beginning " of band reference number 1 relates to the starting of motor.Next frame " N MAX=N NORALMAX" 2 expression maximum allowed engine speed N MAXHas initial value, for example a N MAX=14000rpm, and frame " OHF=OHF BASE" below 3 expressions the overheated factor OHF that will describe, this overheated factor also has base value OHF BASE, OHF for example BASE=0.Certainly, can be N NORALMAX=infinity, being illustrated in beginning the time does not have maximum speed limit usually, and promptly any speed limit only produces during with sufficiently long time of high-engine rotation speed operation at motor.
The monitoring that frame " MEP " 4 relates to engine parameter.Receive and also to store following input parameter: such as from the throttle position TP of (a plurality of) throttle position switch 120, such as from the engine speed N of (a plurality of) engine rotation speed sensor 110 and such as engine temperature T, to be used for further processing from (a plurality of) temperature transducer 130.According to the present invention, only the input from a sensor can be enough to be used for carrying out control loop.
Next frame " increasing OHF? " 5, at least one parameter that relates among (a plurality of) engine parameter T of determining whether to be monitored, TP, the TS satisfies at least one corresponding potential overheated condition.(a plurality of) potential overheated condition can be that for example: 1) engine speed N surpasses the overheated factor rotary speed threshold value N of increase INCREASEOHF, 2) and throttle position TP is in full throttle, 3) engine temperature T surpassed and increases overheated factor temperature threshold T INCREASEOHF
If satisfy (a plurality of) potential overheated condition, motor is considered to be in the risk of overheating zone so.Frame " increase OHF " 6 relates to the accumulation of overheated factor OHF.Therefore, when satisfying potential overheated condition, motor is considered to gather can passive cooling more heat than it.Frame " increase OHF " 6 can only be a timer, and it measures time or the revolution that satisfies (a plurality of) potential overheated condition.But also can carry out weighting to the amount that increases: promptly, surpass what function of (a plurality of) potential overheated condition, for example, temperature T and/or engine speed N are high more, and the amount of increase is big more.
When not satisfying (a plurality of) potential overheated condition, if think motor will be cooled (corresponding to frame " reducing OHF? " " being " of 11), so overheated factor OHF can reduce at frame 12 places that " reduce OHF " or at frame " OHF=OHF BASE" 3 places reset, if perhaps think motor be neither cool off also and do not heat (corresponding to frame " reducing OHF? " " denying " of 11), keep not changing (untouched) so.That is, frame " reducing OHF? " 11 relate among (a plurality of) engine parameter T of determining whether to be monitored, TP, the N at least one satisfy at least one corresponding cool condition.(a plurality of) cool condition can be, for example: 1) engine speed N is lower than and reduces overheated factor rotary speed threshold value N DECREASEOHF, 2) and engine temperature T is lower than and reduces overheated factor temperature threshold T DECREASEOHFBut also can not consider frame " reducing OHF? " 11; In this case, from frame " increasing OHF? " It both can be that frame " reduces OHF " 12 that " denying " of 5 located backward frame, also can alternatively be frame " OHF=OHF BASE" 3.
Reducing of the overheated factor OHF at frame " reduces OHF " 12 places can be fixed value, but also can carry out weighting to the amount that reduces, and for example, temperature T and/or engine speed N are low more, and what reduce is big more.
Following next frame is " OHF＞OHF LIMIT" 7.If overheated factor OHF surpasses overheated factor threshold value OHF LIMITIf think that so motor continues running under the high-engine rotating speed then impaired risk is arranged.Therefore, if surpass overheated factor threshold value OHF LIMIT, maximum allowed engine speed N so MAX" progressively reduce N at ensuing frame MAXUp to N MAX=N REDUCEDMAX" be decreased to one in 8 and reduce to be worth N REDUCEDMAXAs shown in Figure 4, preferably realize gradually reducing, thereby make the user of motor can not experience slowing down suddenly of engine speed N, slow down but experience stably.Yet, the invention is not restricted to slow down stably.Frame " progressively reduces N MAXUp to N MAX=N REDUCEDMAX" 8 and ensuing two frames " MEP/ cumulative time " 9 with " finishing cooling? " 10 have defined one reduces maximum allowed engine speed period.
Frame " MEP/ cumulative time " 9 relates to monitor engine parameters N, TP, T and/or accumulation because overheated factor OHF surpasses overheated factor threshold value OHF LIMITAnd when elapsed time/revolution finishes in ensuing frame to be used for confirming to reduce maximum allowed engine speed period.
Maximum allowed engine speed N MAXReduce carry out always, up to frame " finishing cooling? " 10 places satisfy at least one condition in (a plurality of) end minus minor cycle condition.(a plurality of) end minus minor cycle condition comprises at least one in the following condition: 1) surpass overheated factor threshold value OHF from overheated factor OHF LIMITAfterwards, passed through predetermined revolution or preset time, 2) throttle position TP is lower than full throttle, 3) engine speed N is lower than end minus minor cycle rotary speed threshold value N ENDREDUCTION, 4) and engine temperature T is lower than end minus minor cycle temperature threshold T ENDREDUCTION
When frame " finishing cooling? " 10 places satisfy (a plurality of) when reducing periodic condition, reduce maximum allowed engine speed period 8,9,10 and finally finish, at frame " N MAX=N NORALMAX" 2 places make maximum allowed engine speed N MAXBe reset to its initial value N NORMALMAX, and can restart the accumulation of overheated factor OHF once more.
Fig. 3 shows according to the preferred embodiment of the invention the flow chart with the control corresponding loop, master control loop of Fig. 2.Note that in the frame to indicate+actual value should be counted as schematic embodiment.With corresponding frame among Fig. 2, use identical reference number.
At first it can be seen that at frame " N MAX=14000rpm " in 2, maximum allowable N MAXBe set to 14000rpm, i.e. N NORALMAX=14000rpm.At ensuing frame " t=0 " 3 places, the very first time, t1 was set to t1=0, compared with Fig. 2, and here, overheated factor OHF is very first time t1.
At next frame " monitor speed " 4 places, monitor engine speed N, in this example promptly, neither serviceability temperature T does not use throttle position TP yet in control loop.
At ensuing frame " N＞13500rpm " 5 places, potential overheated condition be engine speed N greater than 13500rpm, i.e. N INCREASEOHF=13500rpm.If engine speed N is greater than threshold value 13500rpm, accumulation very first time t1 in ensuing frame " cumulative time t1 " 6 so, and if its be lower than 13500rpm, get into frame " N＜13000rpm " 11 so.
At frame " N＜13000rpm " 11 places, (be N with corresponding cool condition N＜13000rpm with engine speed N DECREASEOHF=13000rpm) compare.If engine speed N is lower than threshold value 13000rpm, the very first time t1 of accumulation is set to t1=0 so, otherwise the very first time t1 of accumulation is remained unchanged.
At frame " cumulative time t1＞60s " 7 places, confirm that whether motor is with the too high long time of engine speed running.Here, OHF LIMIT=60 seconds.If " denying " is provided, the loop is back to accumulation very first time t1 so, still, if surpass the cumulative time threshold value of 60s, will begin one so and reduce maximum allowed engine speed period.
Start and reduce maximum allowed engine speed period through be set to t2=0 at frame " t2=0 " 9a second time t2 of place.After this, get into frame and " reduce N step by step with 100rpm MAXUp to N MAXTill=the 13000rpm " 8.
" reduce N step by step like frame with 100rpm MAXUp to N MAXTill=the 13000rpm " 8 represented, little by little reduce maximum allowed engine speed N with each 100rpm MAX, up to N MAXReach till the 13000rpm, that is, compare N with Fig. 2 REDUCEDMAX=13000rpm.Work as N MAXWhen reaching 13000rpm, make N MAXRemain on 13000rpm, finish up to the loop and at frame 2 places replacement N MAXTill.Carry out N in the time of can proceeding to frame 8 in the loop at every turn MAXProgressively reduce, yet, also can be in the loop per second time, whenever wait when proceeding to frame 8 for the third time or carry out this and progressively reduce with any other given interval.
At frame " monitor speed " 9b place, monitor speed N.After this, the speed of monitoring is compared with the end minus minor cycle condition of the N＜12500rpm at frame " N＜12500rpm " 10a place, promptly compared N with Fig. 2 ENDREDUCTION=12500rpm.If engine speed N does not reduce to below the threshold value 12500rpm, continue the loop so, and the second time t2 is reset to zero at frame 9a place.Yet,, get into frame " cumulative time t2 " 9c so if engine speed N drops to below the threshold value 12500rpm.At this frame 9c place, accumulate the second time t2, the reduction of the engine speed N that this has guaranteed to represent in frame 10a place is not only the temporary transient reduction that causes owing to the engine speed fluctuation.Ensuing frame " cumulative time t2＞5s " 10b has guaranteed that the reduction of engine speed N is not only temporary transient fluctuation.Be in (certainly as stated, accurate value only as an example) below the 12500rpm if engine speed surpasses 5 seconds continuously, the loop is back to frame 2 so, and restarts thus.If not like this, reduce maximum allowed engine speed period so and restart, but do not reset the second time t2.The technician will be understood that, the frame 9a of Fig. 3,9b, 9c are corresponding with the frame 9 of Fig. 2, and the frame 10a of Fig. 3,10b are corresponding with the frame 10 of Fig. 2.
Fig. 4 shows the maximum allowed engine speed N that changes along with the time MAXThe frame label is corresponding with Fig. 2 and Fig. 3.At first, with maximum allowed engine speed N MAXBe set to N NORMALMAXWhen overheated factor OHF surpasses overheated factor threshold value OHF at frame 7 places LIMITThe time, corresponding with frame 8, maximum allowed engine speed N MAXBeginning reduces gradually, finally reaches N up to it REDUCEDMAXTill.Keep the maximum allowable rotational speed N MAX=N REDUCEDMAXReduction, till (a plurality of) the end minus minor cycle condition that satisfies frame 10 places, after this, 2 places make the maximum allowable rotational speed N at frame MAXReturn to N NORMALMAX
Although illustrate and described the present invention in conjunction with the preferred embodiments, what it will be appreciated that is in the expection broad range of equivalent structures, can implement many modifications, substitute and increase.It can be seen that from aforementioned the present invention has realized at least one said purpose.
For example; It is obvious that; Except (a plurality of) temperature transducer 130, (a plurality of) throttle position switch 120 with (a plurality of) engine rotation speed sensor 110; Also can use other sensors to confirm whether motor turns round in risk of overheating, for example vibration transducer, pressure transducer, combustion sensor, gas and/or fuel flow sensor and Abgassensor.

Claims (16)

1. one kind is used to prevent that internal-combustion engine from the method for harmful engine running taking place, wherein, and according to having initial value (N NORMALMAX) maximum allowed engine speed (N MAX) coming limiting engine rotating speed (N), said motor is in the throttle position running from zero throttle to full throttle, and said method comprises step:
A. monitor at least one engine parameter (N, TP, T);
Whether at least one parameter in one or more engine parameters of b. confirming to be monitored satisfies at least one corresponding potential overheated condition (5);
If c. satisfy the one or more potential overheated condition (5) of step b), then increase the overheated factor (OHF);
D. confirm whether the said overheated factor (OHF) surpasses overheated factor threshold value (OHF LIMIT);
If e. in step d), the said overheated factor (OHF) surpasses said overheated factor threshold value (OHF LIMIT), then make said maximum allowed engine speed (N MAX) during reducing maximum allowed engine speed period (8,9,10), be decreased to one and reduce value (N REDUCEDMAX), wherein, the said maximum allowed engine speed period (8,9,10) that reduces continues, till satisfying at least one end minus minor cycle condition (10);
F. in the operation process of said motor, repeating step is a) to e regularly).
2. method according to claim 1, wherein, said step b) is restricted to:
B. whether the engine speed (N) of definite engine parameter of being monitored satisfies corresponding potential overheated condition (5).
3. method according to claim 1 and 2, wherein, continuously the time cycle between the igniting draws the engine speed (N) of engine parameter through measuring twice.
4. method according to claim 1 and 2, wherein, through measure several times continuously the time cycle between the igniting draw the engine speed (N) of engine parameter, and realize the mean value of some commentaries on classics of said engine speed (N) thus.
5. method according to claim 1, wherein, monitoring throttle position (TP) is as another engine parameter.
6. method according to claim 3, wherein, monitoring throttle position (TP) is as another engine parameter.
7. method according to claim 4, wherein, monitoring throttle position (TP) is as another engine parameter.
8. according to each described method in the claim 1,2,5,6,7, wherein, in step e), little by little carry out said maximum allowed engine speed (N MAX) be decreased to the said value (N that reduces REDUCEDMAX).
9. according to each described method in the claim 1,2,5,6,7, wherein, one or more end minus minor cycle conditions comprise at least one in the following condition: 1) surpass said overheated factor threshold value (OHF from the said overheated factor (OHF) LIMIT) afterwards, through predetermined revolution, 2) surpass said overheated factor threshold value (OHF from the said overheated factor (OHF) LIMIT) afterwards, passed through preset time, 3) said throttle position is lower than full throttle, 4) said engine speed (N) is lower than end minus minor cycle rotary speed threshold value (N ENDREDUCTION), 5) said engine temperature (T) is lower than end minus minor cycle temperature threshold (T ENDREDUCTION).
10. according to each described method in the claim 1,2,5,6,7, wherein, one or more potential overheated conditions comprise in the following condition at least one: 1) said engine speed (N) surpasses the overheated factor rotary speed threshold value (N of increase INCREASEOHF), 2) said throttle position (TP) is in full throttle, 3) said engine temperature (T) surpasses and increases overheated factor temperature threshold (T INCREASEOHF).
11., wherein, in step c), make the said overheated factor (OHF) increase a predetermined value according to each described method in the claim 1,2,5,6,7.
12., wherein,, then reduce the said overheated factor (OHF) if do not satisfy the one or more potential overheated condition (5) of step b) according to each described method in the claim 1,2,5,6,7.
13., wherein, limit said engine speed (N) and comprise ignition timing is departed from respect to the optimum ignition timing of said motor according to each described method in the claim 1,2,5,6,7.
14., wherein, limit said engine speed (N) and comprise and stop at least once to light a fire according to each described method in the claim 1,2,5,6,7.
15. an internal-combustion engine comprises:
One or more cylinders;
The ignition mechanism of light up plug;
Control unit of engine (100) comprises the device that is used to monitor at least one engine parameter (N, TP, T);
Said control unit of engine also comprises and being used for according to having initial value (N NORMALMAX) maximum allowed engine speed (N MAX) come the device of limiting engine rotating speed (N);
Wherein, said control unit of engine (100) is configured to: engine speed (N) and at least one potential overheated condition (5) of the engine parameter of being monitored are made comparisons, and if satisfy said potential overheated condition, then upgrade the overheated factor (OHF); With the said overheated factor (OHF) and overheated factor threshold value (OHF LIMIT) make comparisons, and wherein, if the said overheated factor (OHF) surpasses said overheated factor threshold value (OHF LIMIT), then make said maximum allowed engine speed (N MAX) in reducing maximum allowed engine speed period (8,9,10), be decreased to one and reduce value (N REDUCEDMAX).
16. internal-combustion engine according to claim 15, wherein, monitoring throttle position (TP) is as another engine parameter.
CN2006800564671A 2006-11-28 2006-11-28 A method for preventing internal combustion engine overload Active CN101573529B (en)

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CA2670624A1 (en) 2008-06-05
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CA2670624C (en) 2015-08-11
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