CN103940554B - Fault Diagnosis of Engine and equipment - Google Patents

Fault Diagnosis of Engine and equipment Download PDF

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Publication number
CN103940554B
CN103940554B CN201310022603.7A CN201310022603A CN103940554B CN 103940554 B CN103940554 B CN 103940554B CN 201310022603 A CN201310022603 A CN 201310022603A CN 103940554 B CN103940554 B CN 103940554B
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electromotor
engine
pressure
cylinder
ignition
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CN103940554A (en
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章健勇
许小颖
徐寅
蒋伟峰
高兢
孔毅
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Abstract

The present invention provides a kind of Fault Diagnosis of Engine and equipment, belongs to technical field of engine control。Fault Diagnosis of Engine based on cylinder pressure sensor includes step: record the cylinder pressure of electromotor admission pressure in cycle of operation and top dead centre;Described cylinder pressure is obtained the first pressure ratio divided by described admission pressure;And the compression ratio of described first pressure and electromotor is compared, if the first pressure and with the absolute value of the difference of the described engine compression ratio 8-10% more than or equal to the compression ratio of described electromotor, then judge that the respective cylinder of electromotor exists the state of combustor gas leakage, otherwise, it is judged that the respective cylinder of electromotor is absent from the state of combustor gas leakage。The method can timely and accurately diagnose the combustor gas leakage dependent failure of electromotor, improves the reliability and stability of engine system。

Description

Fault Diagnosis of Engine and equipment
Technical field
The invention belongs to technical field of engine control, relate to the electronic control system strategy of electromotor, particularly relate to the Fault Diagnosis of Engine based on cylinder pressure sensor and equipment。
Background technology
Traditional gasoline engine adopts spark ignition gaseous mixture, then the combustion system carrying out flame propagation carries out, electromotor groundwork is when equivalent gaseous mixture, electromotor may occur because of the malfunction that the problems such as pinking, maintaining make mistakes cause combustor to leak gas, when traditional electromotor runs into the situation of combustor gas leakage, rely on engine controller often cannot diagnose immediately to learn, if continuous firing often aggravates the abrasion of electromotor, even result in the damage of electromotor。
In-cylinder combustion process is carried out more precise control due to needs by novel homogeneity compression-ignition engines etc., it is necessary to increase cylinder pressure sensor to realize accurately measuring and controlling in-cylinder combustion process。
Summary of the invention
In order to solve at least one of the problems referred to above, the present invention proposes based on the cylinder pressure sensor fault diagnosis to engine chamber or piston gas bypass。
It is an aspect of this invention to provide that provide a kind of Fault Diagnosis of Engine based on cylinder pressure sensor, comprising:
Record the cylinder pressure of electromotor admission pressure in cycle of operation and top dead centre;
Described cylinder pressure is obtained the first pressure ratio divided by described admission pressure;And
The compression ratio of described first pressure ratio and electromotor is compared, if the first pressure ratio and with the absolute value of the difference of the described engine compression ratio D% more than or equal to the compression ratio of described electromotor, then judge that the respective cylinder of electromotor exists the state of combustor gas leakage, otherwise, it is judged that the respective cylinder of electromotor is absent from the state of combustor gas leakage。
Fault Diagnosis of Engine according to one embodiment of the invention, wherein, also include: the relation judging between the angle of ignition and top dead centre, and if the angle of ignition occur before top dead center always, after then the angle of ignition being postponed till top dead centre, then carry out described recording step again。
In the Fault Diagnosis of Engine of described embodiment before, also include: if the angle of ignition occurs before top dead center always, revise the Injection Control of electromotor and/or throttle control while after the angle of ignition is postponed till top dead centre so that motor torque output remains unchanged。
In the Fault Diagnosis of Engine of described embodiment before, it is preferable that 8%≤D%≤10%。
Preferably, in the implementation process of described method, keep the steady working condition of electromotor。
Preferably, in described recording step, use the admission pressure meansigma methods in a cycle of operation as described admission pressure。
Preferably, the compression ratio of described electromotor is the compression ratio corresponding to the adiabatic exponent k of gaseous mixture。
Wherein, the adiabatic exponent k of the gaseous mixture in cylinder can be 1.4。
According to another aspect of the present invention, it is provided that a kind of engine diagnosis equipment based on cylinder pressure sensor, comprising:
Pressure record parts, it records the cylinder pressure of electromotor admission pressure in cycle of operation and top dead centre;
First pressure ratio calculating unit, described cylinder pressure is obtained the first pressure ratio divided by described admission pressure by it;And
Breakdown judge parts, the compression ratio of described first pressure ratio and electromotor is compared by it, if the first pressure ratio and with the absolute value of the difference of the described engine compression ratio D% more than or equal to the compression ratio of described electromotor, then judge that the respective cylinder of electromotor exists the state of combustor gas leakage, otherwise, it is judged that the respective cylinder of electromotor is absent from the state of combustor gas leakage。
According to the engine diagnosis equipment of one embodiment of the invention, also include:
The angle of ignition judge and regulate parts, it judges the relation between the angle of ignition and top dead centre, and if the angle of ignition occur before top dead center always, then after the angle of ignition being postponed till top dead centre。
According to the engine diagnosis equipment of one embodiment of the invention, also including controlling parts, its Injection Control being used for revising electromotor and/or throttle control are so that motor torque output remains unchanged。
Preferably, 8%≤D%≤10%。
The solution have the advantages that, it is possible to timely and accurately diagnose the combustor gas leakage dependent failure of electromotor, improve the reliability and stability of engine system。
Accompanying drawing explanation
From described further below in conjunction with accompanying drawing, it will making the above and other purpose of the present invention and advantage be more fully apparent from, wherein, same or analogous key element is adopted and is indicated by the same numeral。
Fig. 1 is the Fault Diagnosis of Engine schematic flow sheet based on cylinder pressure sensor according to one embodiment of the invention。
Detailed description of the invention
Be described below be the present invention multiple possible embodiment in some, it is desirable to provide the basic understanding to the present invention, it is no intended to confirm the crucial of the present invention or conclusive key element or limit scope of the claimed。Easy to understand, according to technical scheme, under the connotation not changing the present invention, one of ordinary skill in the art can propose other implementations that can mutually replace。Therefore, detailed description below and accompanying drawing are only the exemplary illustrations to technical scheme, and are not to be construed as the whole of the present invention or are considered as defining or limiting technical solution of the present invention。
Fig. 1 show the Fault Diagnosis of Engine schematic flow sheet based on cylinder pressure sensor according to one embodiment of the invention。In this embodiment, engine failure method can be, but not limited in application homogeneity compression-ignition engine, and homogeneity compression-ignition engine is provided with pressure transducer, and it can be used to Real-time Collection internal pressure of combustion chamber state。It is to be appreciated that for the electromotor being not provided with pressure transducer, it is possible to for this diagnostic method, corresponding pressure transducer is set。The Fault Diagnosis of Engine based on cylinder pressure sensor is described in detail below in conjunction with Fig. 1。
First step S110, by pressure transducer record cylinder pressure P_tdc and admission pressure P_intake。
In this step, pressure transducer can gather, in the cycle of operation inter-sync of electromotor, the pressure state that engine combustion is indoor。Specifically, in a duty cycle, if during engine ignition burning, when the angle of ignition occurs After Top Center, by the pressure transducer record cylinder pressure P_tdc at top dead center position, and record admission pressure P_intake, specifically cylinder pressure P_tdc and P_intake can be recorded in the controller of electromotor。The P_tdc now recorded not is maximum cylinder pressure value, and when the angle of ignition occurs After Top Center, igniting exhaust hood pressure can be further up。If electromotor misfires during burning, the cylinder pressure of whole process can be gathered by pressure transducer in a cycle of operation, a certain cylinder pressure is judged to the cylinder pressure P_tdc of top dead centre, for instance, the maximum of the cylinder pressure of collection is judged to the cylinder pressure P_tdc of top dead centre;Engine intake valve in a cycle of operation opens period collection admission pressure, and a certain admission pressure is judged to the cylinder pressure P_tdc of top dead centre, for instance, the meansigma methods of the admission pressure of collection is judged to the cylinder pressure P_tdc of top dead centre。It is to be appreciated that the recording method of cylinder pressure P_tdc and admission pressure P_intake is not restrictive。
In a further embodiment, if the angle of ignition occurs before top dead center always, now need to check when whether combustor leaks gas, after needing first the angle of ignition to be postponed till top dead centre before performing step S110, Injection Control and/or the throttle control of electromotor can be revised simultaneously, motor torque output is remained unchanged, then performs step S110, the cylinder pressure P_tdc and admission pressure P_intake of record top dead centre。
Further, step S120, calculate the first pressure ratio C1=P_tdc/P_intake。
Further, step S130, obtain the compression ratio of this electromotor: F_comp?k。
In this step, one characteristic parameter of gaseous mixture when the adiabatic exponent k of gaseous mixture is electromotor operation, k can demarcate according to experiment, can set k for gasoline engine and directly use as 1.4。The design parameter that compression ratio F_comp is electromotor of electromotor, in such an embodiment, it is preferable the adiabatic exponent of record gaseous mixture is the compression ratio F_comp corresponding to k?k。
It is to be appreciated that the precedence relationship between step S130 and step S110 and step S120 is not limited by embodiment illustrated in fig. 1 of the present invention, for instance, before step S110, it is also possible to draw the compression ratio F_comp of this electromotor?k。
Further, step S140, compares C1 and F_comp?k。
In this step, C1 and F_comp is drawn?The absolute value of the difference between k, i.e. C1-F_comp?K, it is achieved gap therebetween compares。
Further, step S150, it is judged that the gas leakage state of the combustor of electromotor。
In this step, if C1-F_comp?K >=D% × F_comp?K then judges that this cylinder exists the fault of combustor gas leakage;Otherwise, this judges that this cylinder is absent from the fault of combustor gas leakage。In this embodiment, D can in the scope of 8-10 value, for instance D% is 8% or 10%。
So far, breakdown in the motor diagnostic method process terminates substantially。Above step S110 to S150 can cyclically constantly carry out, it is thus possible to judge whether combustion chamber of air cylinder's (or piston ring) of electromotor exists principal fault accurately and in time, improves the reliability and stability of engine system。Certainly, if other faults (such as scuffing of cylinder bore) such as the scuffing of cylinder bore that causes of gas leakage, it is also possible to find timely and accurately。
In a preferred embodiment, in order to improve the accuracy of the judgement of method as shown in Figure 1, during tracing trouble, electromotor is preferably at relatively stable operating mode;Simultaneously as there is fluctuation in admission pressure, it is possible to use the admission pressure meansigma methods in a cycle of operation is as calculating the admission pressure used。
Example above primarily illustrates Fault Diagnosis of Engine and the relevant device thereof of the present invention。Although only some of them embodiments of the present invention being described, but those of ordinary skill in the art it is to be appreciated that the present invention can without departing from its spirit with scope in many other form implement。Therefore, the example shown and embodiment are considered illustrative and not restrictive, and when the of the present invention spirit and scope defined without departing from such as appended claims, the present invention is likely to contain various amendments and replacement。

Claims (12)

1. the Fault Diagnosis of Engine based on cylinder pressure sensor, it is characterised in that including:
Record the cylinder pressure of electromotor admission pressure in cycle of operation and top dead centre;
Described cylinder pressure is obtained the first pressure ratio divided by described admission pressure;And
The compression ratio of described first pressure ratio and electromotor is compared, if the first pressure ratio and with the absolute value of the difference of the described engine compression ratio D% more than or equal to the compression ratio of described electromotor, then judge that the respective cylinder of electromotor exists the state of combustor gas leakage, otherwise, it is judged that the respective cylinder of electromotor is absent from the state of combustor gas leakage。
2. Fault Diagnosis of Engine as claimed in claim 1, it is characterized in that, also include: the relation judging between the angle of ignition and top dead centre, and if the angle of ignition occur before top dead center always, after then the angle of ignition being postponed till top dead centre, then carry out described recording step again。
3. Fault Diagnosis of Engine as claimed in claim 2, it is characterized in that, also include: if the angle of ignition occurs before top dead center always, revise the Injection Control of electromotor and/or throttle control while after the angle of ignition is postponed till top dead centre so that motor torque output remains unchanged。
4. the Fault Diagnosis of Engine as in any of the one of claim 1-3, it is characterised in that 8%≤D%≤10%。
5. the Fault Diagnosis of Engine as in any of the one of claim 1-3, it is characterised in that in the implementation process of described method, keeps the steady working condition of electromotor。
6. the Fault Diagnosis of Engine as in any of the one of claim 1-3, it is characterised in that in described recording step, uses the admission pressure meansigma methods in a cycle of operation as described admission pressure。
7. the Fault Diagnosis of Engine as in any of the one of claim 1-3, it is characterised in that the compression ratio of described electromotor is the compression ratio corresponding to the adiabatic exponent k of gaseous mixture。
8. Fault Diagnosis of Engine as claimed in claim 7, it is characterised in that the adiabatic exponent k of the gaseous mixture in cylinder is 1.4。
9. the engine diagnosis equipment based on cylinder pressure sensor, it is characterised in that including:
Pressure record parts, it records the cylinder pressure of electromotor admission pressure in cycle of operation and top dead centre;
First pressure ratio calculating unit, described cylinder pressure is obtained the first pressure ratio divided by described admission pressure by it;And
Breakdown judge parts, the compression ratio of described first pressure ratio and electromotor is compared by it, if the first pressure ratio and with the absolute value of the difference of the described engine compression ratio D% more than or equal to the compression ratio of described electromotor, then judge that the respective cylinder of electromotor exists the state of combustor gas leakage, otherwise, it is judged that the respective cylinder of electromotor is absent from the state of combustor gas leakage。
10. engine diagnosis equipment as claimed in claim 9, it is characterised in that also include:
The angle of ignition judge and regulate parts, it judges the relation between the angle of ignition and top dead centre, and if the angle of ignition occur before top dead center always, then after the angle of ignition being postponed till top dead centre。
11. engine diagnosis equipment as claimed in claim 10, it is characterised in that also include controlling parts, its Injection Control being used for revising electromotor and/or throttle control are so that motor torque output remains unchanged。
12. engine diagnosis equipment as claimed in claim 9, it is characterised in that 8%≤D%≤10%。
CN201310022603.7A 2013-01-22 2013-01-22 Fault Diagnosis of Engine and equipment Active CN103940554B (en)

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CN106948959B (en) * 2015-12-15 2021-10-12 迪尔公司 Method for determining the health of a cylinder in a reciprocating piston engine

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