CN109339960B - Method and device for regulating and controlling idle speed of engine - Google Patents

Method and device for regulating and controlling idle speed of engine Download PDF

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Publication number
CN109339960B
CN109339960B CN201811438391.XA CN201811438391A CN109339960B CN 109339960 B CN109339960 B CN 109339960B CN 201811438391 A CN201811438391 A CN 201811438391A CN 109339960 B CN109339960 B CN 109339960B
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engine
idle speed
ecm
speed
max
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CN109339960A (en
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许雅丽
韩文飞
包曙光
许雨涛
刘国庆
汪名月
赵福成
王瑞平
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Zhejiang Geely Holding Group Co Ltd
Yiwu Geely Powertrain Co Ltd
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Yiwu Geely Engine Co ltd
Zhejiang Geely Holding Group Co Ltd
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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
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention provides aA method of regulating idle speed of an engine, comprising: the ECM sends an idle speed instruction to the engine to enable the engine to enter an idle speed state; ECM at standard idle speed N0Regulating and controlling the idle speed N of the engine for the target speed; the ECM acquires the idle speed N of the engine, the exciting current i output by an exciting device at the idle speed N and the corresponding standard idle speed N0Idle speed threshold value NmaxAnd corresponding to a standard idling speed N0And an idle speed threshold NmaxExcitation current threshold value imax(ii) a The ECM compares the obtained excitation current i with an excitation current threshold imaxAccording to the obtained exciting current i and the exciting current threshold value imaxThe magnitude relation of (a) adjusts the idle speed N of the engine. The invention also relates to a device for regulating and controlling the idle speed of the engine, which can achieve the purposes of low cost, high reliability and comfort through function development and program calibration under the condition of not changing the existing AMS hardware.

Description

Method and device for regulating and controlling idle speed of engine
Technical Field
The invention relates to the field of vehicle engines, in particular to a method and a device for regulating and controlling the idle speed of an engine.
Background
The idling state refers to an operating condition when the engine is idling. In fact, the idling speed of the engine is too low, so that the automobile is flamed out when the automobile is temporarily stopped (such as stopping, turning and decelerating when meeting a red light). If the idling speed of the engine is too high, the fuel consumption is increased, the working temperature of the engine is increased, the abrasion of the engine is accelerated, and great impact sound is generated during the speed changing and gear shifting, so that the automobile is greatly damaged.
With the increasing demand of national policy on fuel consumption targets, a number of new technologies are developed, such as AMS (Intelligent power generation Management System), ISS (Intelligent Start/Stop System), BSG of 48V, and the like. In order to save oil and improve the driving comfort of customers, the intelligent power generation management system is added to the vehicle, and the performance of a gear train, which is a key component of the intelligent power generation management system, of the intelligent power generator is also important.
In the prior art, the one-way belt pulley is assembled on the generator, and when the generator rotates reversely, the belt pulley is separated from the generator, so that the generator is prevented from rotating reversely when the speed is reduced; because the spring structure in the AID band pulley (generator separation Isolator) when accelerating, can make the quality of generator slowly increase to the train to reduce the impact to the train, improve and drive the comfort level.
Furthermore, the existing intelligent power generation function is only used under the conditions of rapid acceleration and rapid deceleration and is not utilized under other working conditions, so that the application range of the intelligent power generation function is limited. Particularly, when the three-cylinder engine is matched with the generator separation vibration isolator, and the engine is in low idling under the idling working condition, due to the special structure of the generator separation vibration isolator and the characteristic that the low idling angular vibration of the 3-cylinder engine is large (the characteristic of the 3-cylinder engine is that the lower the standard idling speed of the engine is, the larger the angular vibration is), the low idling working condition of the generator separation vibration isolator and the condition that the current output of the generator is overlarge can be caused to occur simultaneously, so that the consumed energy is overhigh, the reliability of the generator separation vibration isolator is also influenced, and the use of the generator separation vibration isolator is limited. And if the generator is cancelled to separate the vibration isolator, the driving comfort is influenced. However, if the OAD (over insulator decoupling, generator over isolator) pulley with higher reliability is used, the cost will be increased, and obviously, the above is not an ideal solution.
Disclosure of Invention
In view of the above, there is a need for a method and apparatus for regulating and controlling the idle speed of an engine, which can ensure that an AID pulley operates in a safe range to ensure both driving comfort and reliability of the AID pulley.
The invention provides a method for regulating and controlling the idle speed of an engine, which comprises the following steps:
the ECM sends an idle speed instruction to the engine to enable the engine to enter an idle speed state;
ECM at standard idle speed N0Regulating and controlling the idle speed N of the engine for the target speed;
the ECM acquires the idle speed N of the engine, the exciting current i output by an exciting device at the idle speed N and the corresponding standard idle speed N0Idle speed threshold value NmaxAnd corresponding to a standard idling speed N0And an idle speed threshold NmaxExcitation current threshold value imax；
The ECM compares the obtained excitation current i with an excitation current threshold imaxAccording to the obtained exciting current i and the exciting current threshold value imaxThe magnitude relation of (a) adjusts the idle speed N of the engine. Further, the ECM stores therein a standard idle speed N0And an idle speed threshold NmaxWith output current threshold I of the generatormaxAnd an excitation current threshold imaxBy reading the exciting current i, the exciting current i and the exciting current threshold value i are judgedmaxObtaining the output current I and the output current threshold I of the generatormaxRegulating and controlling the idle speed N of the engine, wherein the standard idle speed N0The idle speed is obtained according to the experiment when the comprehensive performance is optimal, and the threshold value N of the idle speedmaxIn order to combine a standard idle speed N0And obtaining the maximum allowable idle speed according to the experiment.
Further, the standard idling speed N of the engine0And an idle speed threshold N of the enginemaxPre-stored within the ECM; the ECM is also stored with the standard idling speed N of the engine0Corresponding first output current threshold Imax1Said excitation current threshold value imaxIncluding a first output current threshold Imax1Corresponding first excitation current threshold imax1And the first excitation current threshold value imax1Is stored within the ECM.
Further, if the excitation current i read by the ECM is smaller than the first excitation current threshold value imax1The output current I of the generator is at a first output current threshold Imax1The ECM does not control the idle speed N of the engine, and the engine maintains the current idle speed N.
Further, if the excitation current i read by the ECM is larger than or equal to the first excitation current threshold value imax1The output current I of the generator exceeds a first output current threshold Imax1ECM gives a speed increase command to the engine to bring the target engine speed from the standard idling speed N0Raising to idle speed threshold Nmax。
Further, the ECM is also stored with the idle speed threshold value N obtained through experimentsmaxCorresponding second output current threshold Imax2Said excitation current threshold value imaxFurther comprising a second output current threshold Imax2Corresponding second excitation current threshold imax2Said second excitation current threshold imax2Experimentally obtained and stored within said ECM; if the output current I of the generator is reduced, the excitation current I read by the ECM is less than or equal to the second excitation current threshold value Imax2The ECM issues a speed increase cancellation command to the engine, and the idle speed N of the engine decreases.
The invention also provides a device for regulating and controlling the idle speed of the engine, which comprises the engine, a generator assembly attached to the engine and an ECM (electronic control module) for regulating and controlling the engine, wherein the generator assembly is provided with a generator and an excitation device in signal connection with the generator, and the excitation device can generate electricity according to the electricityThe output current I of the machine outputs corresponding exciting current I; the ECM is in signal communication connection with the engine, sends an idling instruction to the engine, regulates and reads the idling speed N of the engine; the excitation device is connected with the ECM through signal communication and outputs excitation current i to the ECM; the ECM regulates the engine speed at a standard idle speed N0Regulating the idle speed N of the engine for the target speed and storing the standard idle speed N0And corresponding to a standard idling speed N0Idle speed threshold value NmaxObtaining the standard idling speed N0And an idle speed threshold NmaxCorresponding excitation current threshold imaxComparing the obtained exciting current i with an exciting current threshold value i according to the read exciting current imaxJudging the output current I and the output current threshold I of the starting motor according to the magnitude relationmaxAnd adjusting the idle speed N of the engine.
Further, the excitation current threshold imaxIncluding the standard idling speed N of the engine0Corresponding first excitation current threshold imax1If the excitation current i read by the ECM is smaller than a first excitation current threshold value imax1The ECM does not control the idle speed N of the engine, and the engine keeps the current idle speed N unchanged.
Further, the excitation current threshold imaxIncluding the standard idling speed N of the engine0Corresponding first excitation current threshold imax1If the excitation current i read by the ECM is larger than or equal to a first excitation current threshold value imax1The ECM sends a rotating speed increasing instruction to the engine to enable the target rotating speed of the engine to be equal to the standard idling rotating speed N0Raising to idle speed threshold Nmax。
Further, the excitation current threshold imaxFurther comprising corresponding to the idle speed threshold value NmaxSecond excitation current threshold value imax2If the output current I of the generator is reduced, the excitation current I read by the ECM is less than or equal to the second excitation current threshold value Imax2The ECM issues a speed increase cancellation command to the engine, startingThe idle speed N of the machine decreases.
For details of the generator, the engine and other body components, reference may be made to the prior art, and details thereof are not repeated herein.
In conclusion, in the invention, in the idle state of the engine, the magnitude of the exciting current and the exciting current threshold is compared through the ECM, and if the output current of the generator exceeds the bearable range of the generator separation vibration isolator, the standard idle speed of the engine is improved to avoid the simultaneous occurrence of large torsional vibration of the engine and high consumption of the generator at low idle speed, so that the double pressure on the generator separation vibration isolator is reduced (especially for a 3-cylinder machine).
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an apparatus for regulating a standard idle speed of an engine according to the present invention;
FIG. 2 is a schematic structural diagram illustrating the installation of a generator and generator decoupling vibration isolator of the generator assembly of FIG. 1;
FIG. 3 is a block flow diagram of a method for regulating idle speed of an engine according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 1-2, the present invention provides a device for regulating idle speed of an Engine, which includes a generator assembly 10 attached to the Engine and an ECM (Engine Control Module) for regulating the Engine.
In detail, the generator assembly 10 comprises a generator 11, the generator 11 being able to output a current I; the generator assembly 10 is also provided with an excitation device connected to the generator 11 to enable direct transmission of the excitation current signal to the ECM.
Standard idling speed N of engine0And an idle speed threshold NmaxRespectively with the output current threshold I of the generator 11maxAnd a threshold value i of the excitation current of the excitation devicemaxThe excitation device has a one-to-one correspondence relationship, and can output the corresponding excitation current I according to the output current I of the generator. In the present embodiment, the output current threshold I of the generator 11maxComprises a first output current threshold Imax1And a second output current threshold Imax2Excitation current threshold i of the excitation devicemaxIncluding a first excitation current threshold imax1And a second excitation current threshold imax2. Standard idling speed N of engine0Corresponding to the first output current threshold value I of the generator 11max1And a first excitation current threshold i of the excitation devicemax1Threshold value N of idling speed of enginemaxCorresponding to the second output current threshold value I of the generator 11max2And a second excitation current threshold i of the excitation devicemax2。
In this embodiment, the excitation device is connected in signal (current signal) communication with the ECM. Specifically, the excitation device is in bidirectional communication connection with the ECM; the ECM can directly read the exciting current i output by the exciting device; conversely, the excitation device may also adjust the magnitude of the excitation current i according to a rotational speed increase control signal (acceleration signal) transmitted by the ECM.
The engine is connected in signal (command signal, current signal) communication with the ECM. Specifically, the Engine is in bidirectional communication connection with an ECM (Engine Control Module), and the ECM can Control the Engine to enter an idling state by sending an idling instruction to the Engine; standard idling speed N0Regulating the idle speed N of the engine for the target speed, regulating the idle speed N to the standard idle speed N0Or regulating and controlling the idle speed N to the standard idle speed N0Near while the idling speed N of the engine is at the standard idling speed N0When nearby, the standard idling speed N stored in the ECM and the engine is obtained0First output current threshold I of corresponding generator 11max1And an idle speed threshold NmaxAnd with a first output current threshold Imax1Corresponding first excitation current threshold imax1(ii) a Further, the ECM may also derive an idle speed threshold NmaxSecond output current threshold I of corresponding generatormax2And with a second output current threshold Imax2Corresponding second excitation current threshold imax2。
In the invention, the ECM can also obtain a first excitation current threshold value i stored in the ECM according to the obtained excitation current imax1And a second excitation current threshold imax2Sends an acceleration or acceleration cancellation signal to the engine to regulate the idle speed N of the engine.
In this embodiment, the generator 11 is provided with a generator separation vibration isolator 13, and the generator separation vibration isolator 13 is connected to the generator shaft through a bolt; the device for regulating and controlling the idling speed of the engine further comprises a belt 20, a tensioner 30, a crankshaft 40 and an air-conditioning compressor 50, wherein the belt 20 sequentially bypasses a belt wheel of the crankshaft 40, a belt wheel of the air-conditioning compressor 50, a generator separation vibration isolator 13 of the generator 11 and a belt wheel of the tensioner 30 to form a wheel train of the generator 11, the wheel train can improve the comfort of the vehicle, and the reliability of the wheel train is mainly judged according to the output current I of the generator 11 and the idling speed N of the engine.
In detail, the tensioner 30 of the present invention is a holding device on a belt transmission system, which can keep the belt 20 in proper tension during transmission, so as to avoid slipping of the belt 20 or occurrence of tooth jumping and tooth dropping. Naturally, in other embodiments, the wheel system of the generator 11 may also be a structure of a generator decoupling vibration isolator (AID pulley) without the tensioner 30, which is specifically referred to in the prior art and is not limited herein.
Details of the generator 11, the engine and other body components can be found in the prior art, and are not described herein.
It will be appreciated that the main objects of the invention are: under the idle working condition of the vehicle, if the idle speed of the engine is in an idle working stateUnder the condition, the idling speed of the engine in normal work is at the standard idling speed N0Nearby) is too low, the vehicle angular vibration is larger, and the output current of the generator is too large, so that the problem that the generator separation vibration isolator 13 is easy to fail is solved, therefore, the ECM in the invention needs to be capable of regulating and controlling the idle speed N of the engine (in the standard idle speed N) according to the output current I of the generator0On the basis of) to avoid low idle, high current conditions. However, because the ECM cannot directly read the output current I of the generator, but can directly read the magnitude of the exciting current I transmitted by the exciting device, the exciting current I has a one-to-one correspondence relationship with the output current I of the generator at a certain temperature and a certain rotation speed, and when the idling rotation speed and the temperature are constant, the output current I of the generator increases with the increase of the exciting current I and decreases with the decrease of the exciting current I. Therefore, in the invention, the ECM reads the size of the exciting current i transmitted by the exciting device and is used for comparing the obtained exciting current i with the exciting current threshold value i stored in the ECMmaxDeducing (obtaining/obtaining) the output current I and the output current threshold I of the generatormaxAccording to the output current I of the generator and the output current threshold ImaxThe idling speed N of the engine is regulated and controlled according to the size relationship, the output current I of the generator is adjusted, and the purpose of avoiding the simultaneous occurrence of high current and low idling is achieved.
Referring to fig. 3, the present invention also provides a method of regulating idle speed of an engine, the method comprising:
the ECM sends an idle speed instruction to the engine to enable the engine to enter an idle speed state;
ECM at standard idle speed N0Regulating the idling speed N of the engine for a target speed (to a standard idling speed N)0Or adjusted to the standard idling speed N0Nearby);
the ECM acquires the idle speed N of the engine, the exciting current i output by an exciting device corresponding to the idle speed N and the corresponding standard idle speed N0Idle speed threshold value NmaxAnd corresponding standard idle speedRotational speed N0And an idle speed threshold NmaxExcitation current threshold value imax；
The ECM compares the obtained excitation current i with an excitation current threshold imaxAccording to the obtained exciting current i and the exciting current threshold value imaxThe magnitude relation of (a) adjusts the idle speed N of the engine.
Specifically, the ECM stores standard idle speed N of the engine0Standard idling speed N0First output current threshold I of generatormax1(i.e., standard idle speed N)0Maximum output current of the generator which can not be borne by the generator separation vibration isolator) and corresponding first excitation current threshold value imax1MAP (MAP), and the ECM stores the MAP and the standard idling speed N0Corresponding idle speed threshold value NmaxThe standard idling speed N0The idle speed threshold value N is the idle speed obtained by experiments when the comprehensive performance is optimalmaxIn order to combine a standard idle speed N0And the maximum idle speed which can be borne by the AID belt wheel is obtained according to experiments. In this way, the ECM of the invention is enabled by reading the excitation current i and the first excitation current threshold imax1Deducing the output current I of the starting motor and the first output current threshold I of the generatormax1The magnitude relation of (1) is used for determining whether the idle speed N and the target speed of the engine need to be adjusted or not according to the magnitude relation, so that the output current I of the generator is changed due to the change of the idle speed N of the engine, and the situations of high current and low idle speed are avoided.
Specifically, the ECM regulates the idle speed of the engine including:
first case (refer with emphasis to fig. 3):
if the exciting current i obtained by the ECM is smaller than the first exciting current threshold value imax1That is, the output current I of the generator is at a first output current threshold Imax1At this time, the ECM does not control the idle speed N of the engine, and the engine keeps the current idle speed N unchanged.
Second case (refer with emphasis to fig. 3):
if the excitation current i obtained by the ECM is larger than or equal to the first excitation current threshold value imax1That is, the output current I of the generator exceeds the range of the output current that the AID pulley can bear, and the ECM commands the engine to increase the target engine speed from the standard idle speed N by sending a speed increase command to the engine0Raising to idle speed threshold NmaxThe condition that the idling speed of the engine is too low and the output current I of the generator is too large is avoided.
In the second case, the target speed of the engine is changed from the standard idling speed N0Raising to idle speed threshold NmaxOn the basis, the MAP also comprises a corresponding idle speed threshold value N obtained through experimentsmaxSecond output current threshold value Imax2While the excitation means also includes a corresponding idling speed threshold NmaxAnd a second output current threshold Imax2Second excitation current threshold value imax2In this case, the above basis (the target speed of the engine is increased to the idle speed threshold N)maxOn the basis) to further regulate and control the idle speed of the engine (refer to fig. 3 with emphasis), specifically including the following:
when the target speed of the engine is changed from the standard idling speed N0Raising to idle speed threshold NmaxThen, the output current I of the generator is reduced because the storage battery is charged or some vehicle-mounted electric appliances are turned off by users, and the exciting current I read by the ECM is reduced to be less than or equal to a second exciting current threshold value Imax2During the process, the ECM sends a rotating speed increasing and canceling instruction to the engine, the idle rotating speed N and the target rotating speed of the engine are reduced, at the moment, the impact on the AID belt wheel is also small due to the fact that the output current I is small, oil consumption is reduced by reducing the idle rotating speed N of the engine, and the generator separating vibration isolator 13 is guaranteed to work in a safe range all the time. In a preferred embodiment, the idle speed N of the engine is increased by an idle speed threshold NmaxReduced to the pre-rise standard idling speed N0。
The invention will now be described with reference to a specific embodiment:
the generator one-way belt pulley damages in some model endurance test process, and the analysis reason is: the output current of the generator is overlarge when the engine idles, and the improvement scheme is as follows:
firstly, the ECM sends an idling instruction to an engine, and the engine is in an idling state; considering the influence of comprehensive factors such as oil consumption, NVH and the like, the standard idling speed N of the engine is selected through tests0And setting the ECM to make the idling speed N of the engine be at the standard idling speed N0And further reading a corresponding relation MAP graph of the idle speed N of the engine, the output current I of the generator and the exciting current I of the exciting device by using the ECM, and regulating and controlling the idle speed N of the engine. The specific steps for obtaining the MAP are as follows:
at the standard idling speed N of the engine0Then, the maximum output current I of the generator that the generator decoupling vibration isolator (AID pulley) cannot withstand is measured, for example, at the standard idling speed N of the engine0Measuring a first output current threshold value Imax of the generator at 900rpm1(maximum current that the AID pulley can bear) is 100A, and at this time, the corresponding first excitation current threshold value imax1Unknown;
then combining the standard idling speed N0The standard idling speed N of the engine is determined through tests0Lower idle speed threshold NmaxIs 1000 rpm; further, according to the real vehicle verification test, the idling speed threshold value N of the engine is testedmaxAt 1000rpm, the second output current threshold I of the corresponding generatormax270A, the corresponding second excitation current threshold value imax2Unknown, see in particular the following table:
idle speed (N) Excitation current (i)) Output current (I)
900rpm imax1 100A
1000rpm imax2 70A
Further, on the generator performance bench, a first excitation current threshold i is measuredmax13.3A, second excitation current threshold imax23.1A, a full MAP is thus obtained, as follows,
idle speed (N) Exciting current (i) Output current (I)
900rpm 3.3A 100A
1000rpm 3.1A 70A
After measuring the complete MAP graph, the standard idling speed N of the engine is measured0At 900rpmThe MAP obtained is written into and stored in the ECM, and the adjustment strategy for the idle speed N is written into and stored in the ECM.
The adjustment strategy for the idle speed N is as follows:
the ECM sends an idle command to the engine so that the engine is in an idle state. In the idle state, when the standard idle speed N of the engine0At 900rpm, if the excitation current i read (obtained) by the ECM is less than the first excitation current threshold imax1I.e. less than 3.3A, the ECM does not control the idle speed of the engine, i.e. the idle speed N of the engine remains unchanged at the present idle speed N when the output current I of the generator is within the normal operating range.
If the excitation current i read (obtained) by the ECM is larger than or equal to the first excitation current threshold imax1When the output current I of the generator exceeds the range of normal operation, the ECM raises the target rotating speed of the engine from the standard idling rotating speed of 900rpm to the idling rotating speed threshold of 1000rpm, so that the conditions of low idling and high current are avoided.
Increasing the idle speed N of the engine to the idle speed threshold N stored in the ECMmaxThat is, after 1000rpm, the output current I of the generator is reduced due to the completion of charging or the user turning off the vehicle-mounted electrical appliance, and if the excitation current I obtained by the ECM is smaller than the second excitation current threshold imax at this time2(3.1A), the ECM sends a speed increase cancellation command to the engine, and the target speed of the engine is reduced from the idle speed threshold of 1000rpm to the standard idle speed of 900rpm before the increase.
In summary, in the invention, the idling speed of the engine is adjusted by comparing the magnitude relation between the exciting current and the exciting current threshold value by the ECM when the engine is in the idling state, so that the output current of the generator and the consumed energy of the generator are always within the safe range which can be borne by the AID belt pulley, if the output current of the generator and the consumed energy of the generator exceed the bearable range of the AID belt pulley, the idling speed is increased, and the conditions of low rotating speed, large torsional vibration and high consumption of the generator are avoided and occurred at the same time, so as to reduce the double pressure on the AID belt pulley (especially for 3-cylinder machines; in addition, the hardware of the existing AMS (automatic Management System, Chinese: power Management System) is not changed, and the purposes of low cost, high reliability and comfort can be achieved only by developing the function and calibrating the program.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A method of regulating idle speed of an engine, comprising:
the ECM sends an idle speed instruction to the engine to enable the engine to enter an idle speed state;
ECM at standard idle speed N0Regulating and controlling the idle speed N of the engine for the target speed;
the ECM acquires the idle speed N of the engine, the exciting current i output by an exciting device at the idle speed N and the corresponding standard idle speed N0Idle speed threshold value NmaxAnd corresponding standard idle speed N0And an idle speed threshold NmaxExcitation current threshold value imax；
The ECM compares the obtained excitation current i with an excitation current threshold imaxAccording to the obtained exciting current i and the exciting current threshold value imaxRegulating the idle speed N of the engine according to the magnitude relation;
the ECM stores standard idle speed N0And an idle speed threshold NmaxWith output current threshold I of the generatormaxAnd an excitation current threshold imaxBy reading the exciting current i, the exciting current i and the exciting current threshold value i are judgedmaxObtaining the output current I and the output current threshold I of the generatormaxRegulating and controlling the idle speed N of the engine, wherein the standard idle speed N0 is the idle speed obtained according to the experiment when the comprehensive performance is optimal, and the idle speed threshold Nmax is the maximum idle speed which can be borne by combining the standard idle speed N0 and obtained according to the experiment;
standard idling speed N of engine0And an idle speed threshold N of the enginemaxPre-stored within the ECM; the ECM is also stored with the standard idling speed N of the engine0Corresponding first output current threshold Imax1Said excitation current threshold value imaxIncluding the first output current threshold Imax1Corresponding first excitation current threshold imax1And the first excitation current threshold value imax1Is stored within the ECM.
2. The method of claim 1, wherein if the ECM reads an excitation current i less than a first excitation current threshold imax1The output current I of the generator is at a first output current threshold Imax1The ECM does not control the idle speed N of the engine, and the engine maintains the current idle speed N.
3. The method of claim 1, wherein if the ECM reads an excitation current i that is greater than or equal to a first excitation current threshold imax1The output current I of the generator exceeds a first output current threshold Imax1ECM gives a speed increase command to the engine to bring the target engine speed from the standard idling speed N0Raising to idle speed threshold Nmax。
4. The method of regulating engine idle speed as recited in claim 3, wherein the ECM further stores therein the idle speed threshold N obtained by experimentmaxCorresponding second output current threshold Imax2The excitation currentThreshold value imaxFurther comprising a second output current threshold Imax2Corresponding second excitation current threshold imax2Said second excitation current threshold imax2Experimentally obtained and stored within said ECM; if the output current I of the generator is reduced, the excitation current I read by the ECM is less than or equal to the second excitation current threshold value Imax2The ECM issues a speed increase cancellation command to the engine, and the idle speed N of the engine decreases.
5. The device for regulating and controlling the idle speed of the engine is characterized by comprising the engine, a generator assembly (10) attached to the engine and an ECM (electronic control module) for regulating and controlling the engine, wherein the generator assembly (10) is provided with a generator (11) and an excitation device in signal connection with the generator (11), and the excitation device can output a corresponding excitation current I according to the output current I of the generator; the ECM is in signal communication connection with the engine, sends an idling instruction to the engine, regulates and reads the idling speed N of the engine; the excitation device is connected with the ECM through signal communication and outputs excitation current i to the ECM; the ECM regulates the engine speed at a standard idle speed N0Regulating the idle speed N of the engine for the target speed and storing the standard idle speed N0And corresponding to a standard idling speed N0Idle speed threshold value NmaxObtaining the standard idling speed N0And an idle speed threshold NmaxCorresponding excitation current threshold imaxComparing the obtained exciting current i with an exciting current threshold i according to the read exciting current imaxJudging the output current I and the output current threshold I of the starting motor according to the magnitude relationmaxRegulating the idle speed N of the engine;
a generator separation vibration isolator (13) is arranged on the generator (11), and the generator separation vibration isolator (13) is connected to a generator shaft through a bolt; the device for regulating and controlling the idling speed of the engine further comprises a belt (20), a tensioner (30), a crankshaft (40) and an air-conditioning compressor (50), wherein the belt (20) sequentially bypasses a belt wheel of the crankshaft (40), a belt wheel of the air-conditioning compressor (50), a generator separation vibration isolator (13) of a generator (11) and a belt wheel of the tensioner (30) to form a wheel train of the generator (11).
6. Device for regulating the idle speed of an engine according to claim 5, characterized in that said excitation current threshold imaxIncluding the standard idling speed N of the engine0Corresponding first excitation current threshold imax1If the excitation current i read by the ECM is smaller than a first excitation current threshold value imax1The ECM does not control the idle speed N of the engine, and the engine keeps the current idle speed N unchanged.
7. Device for regulating the idle speed of an engine according to claim 5, characterized in that said excitation current threshold imaxIncluding the standard idling speed N of the engine0Corresponding first excitation current threshold imax1If the excitation current i read by the ECM is larger than or equal to a first excitation current threshold value imax1The ECM sends a rotating speed increasing instruction to the engine to enable the target rotating speed of the engine to be equal to the standard idling rotating speed N0Raising to idle speed threshold Nmax。
8. Device for regulating the idle speed of an engine according to claim 7, characterized in that said excitation current threshold imaxFurther comprising corresponding to the idle speed threshold value NmaxSecond excitation current threshold value imax2If the output current I of the generator is reduced, the excitation current I read by the ECM is less than or equal to the second excitation current threshold value Imax2The ECM issues a speed increase cancellation command to the engine, and the idle speed N of the engine decreases.
CN201811438391.XA 2018-11-27 2018-11-27 Method and device for regulating and controlling idle speed of engine Active CN109339960B (en)

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