CN111997757A - Failure diagnosis method for air inlet preheater of engine - Google Patents
Failure diagnosis method for air inlet preheater of engine Download PDFInfo
- Publication number
- CN111997757A CN111997757A CN202010762126.8A CN202010762126A CN111997757A CN 111997757 A CN111997757 A CN 111997757A CN 202010762126 A CN202010762126 A CN 202010762126A CN 111997757 A CN111997757 A CN 111997757A
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- voltage
- resistor
- preheater
- comparison circuit
- air inlet
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003745 diagnosis Methods 0.000 title claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 108091092568 Alarmone Proteins 0.000 claims description 2
- 238000002405 diagnostic procedure Methods 0.000 claims 9
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a failure diagnosis method for an intake preheater of an engine. The voltage is loaded at two ends of the air inlet preheater, the sampling resistor is connected in series at one low-voltage end of the air inlet preheater, the voltage at one low-voltage end of the air inlet preheater is collected, and whether the air inlet preheater fails or not is judged according to the collected voltage. The diagnosis method can monitor the working state of the air inlet preheater of the engine in real time, is convenient for prompting a bench operator to find the fault of the air inlet preheater as soon as possible, avoids larger loss of the engine caused by the fault, is simple and clear, has simple operation mode, and can quickly judge the quality of the air inlet preheater.
Description
Technical Field
The invention belongs to the technical field of engine control, and particularly relates to a failure diagnosis method for an intake preheater of an engine.
Background
In the development and test stage of the engine, faults such as abnormal abrasion of the engine or damage to a supercharger and the like caused by failure of an air inlet preheater, breakage of a heating plate of the air inlet preheater and entering of the engine are caused, so that the condition of the air inlet preheater needs to be diagnosed.
At present, whether an air inlet preheater fails or not is generally judged by detecting the temperature of an air inlet side of an engine, but the method can only detect when the engine works and cannot detect in advance, so that the air inlet preheater cannot be replaced in time when the failure is detected, and the test efficiency is reduced; meanwhile, even if the temperature is detected to be abnormal, the air inlet preheater cannot be determined to be failed, and the temperature may be abnormal due to the problem of an internal control circuit or other components of the engine, so that the judgment result is inaccurate.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a simple, quick and high-accuracy method for diagnosing the failure of the intake preheater of the engine.
The technical scheme adopted by the invention is as follows: a method for diagnosing the failure of an air inlet preheater of an engine comprises the steps of loading voltages at two ends of the air inlet preheater, connecting a sampling resistor in series at one low-voltage end of the air inlet preheater, collecting the voltage at one low-voltage end of the air inlet preheater, and judging whether the air inlet preheater fails according to the collected voltage.
Further, when the collected voltage is within a set range, judging that the intake air preheater is not invalid; and when the acquired voltage exceeds a set range, judging that the air inlet preheater is invalid.
And further, judging whether the air inlet preheater fails or not through a double-limit window voltage comparison circuit.
Furthermore, the double-limit window voltage comparison circuit comprises a first comparison circuit, a second comparison circuit, a judgment circuit and an alarm, wherein a first input end of the first comparison circuit is connected with the loading voltage, a second input end of the first comparison circuit is connected with one low-voltage end of the air inlet preheater, and an output end of the first comparison circuit is connected with an input end of the judgment circuit; the first input end of the second comparison circuit is connected with the low-voltage end of the air inlet preheater, the second input end of the second comparison circuit is connected with the loading voltage, the output end of the second comparison circuit is connected with the input end of the judgment circuit, and the output end of the judgment circuit is connected with the alarm.
Further, comparing the collected voltage with threshold voltages of the first comparison circuit and the second comparison circuit respectively; when the collected voltage is within the two threshold voltage ranges, the judgment circuit judges that the voltage is not invalid and does not give an alarm; when the acquired voltage is not in the two threshold voltage ranges, the judgment circuit judges that the voltage is invalid and carries out alarm prompt through the alarm.
Further, the threshold voltage of the first comparison circuit is smaller than the threshold voltage of the second comparison circuit.
Further, the first comparison circuit comprises a resistor R1, a resistor R2, a comparator A1 and a diode D1, one end of the resistor R1 is connected with the loading voltage, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the sliding end of the resistor R2 is connected with the inverting input end of the comparator A1, the non-inverting input end of the comparator A1 is connected between the sampling resistor R7 and the intake air preheater, and the output end of the comparator A1 is connected with the input end of the judgment circuit through the diode D1.
Further, the second comparison circuit comprises a resistor R3, a resistor R4, a comparator A2 and a diode D2, one end of the resistor R3 is connected with the loading voltage, the other end of the resistor R3 is connected with one end of a resistor R4, the other end of the resistor R4 is grounded, the sliding end of the resistor R4 is connected with the non-inverting input end of the comparator A2, the inverting input end of the comparator A2 is connected between the sampling resistor R7 and the intake air preheater, and the output end of the comparator A2 is connected with the input end of the judgment circuit through the diode D2.
Further, judge that the circuit includes resistance R5, resistance R6, triode VT and relay KA, first comparison circuit and second comparison circuit's output is connected to resistance R5 one end, and triode VT's base is connected to the resistance R5 other end, relay KA's coil one end and contact one end connection power, relay KA's the coil other end connect triode VT's collecting electrode through resistance R6, triode VT's projecting pole ground connection, relay KA's the contact other end connect alarm one end, alarm other end ground connection.
Further, the magnitude of the applied voltage is DC 5-12V.
The diagnosis method can accurately monitor the working state of the air inlet preheater of the engine in real time, is convenient for prompting the operator of the rack to find the fault of the air inlet preheater as soon as possible, avoids the larger loss of the engine caused by the fault, is simple and clear, has simple operation mode, and can quickly judge the quality of the air inlet preheater.
Drawings
FIG. 1 is a schematic diagram of an intake air preheater sampling circuit of the present invention.
FIG. 2 is a schematic diagram of a double window voltage comparison circuit according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1 and FIG. 2, the present invention provides a method for diagnosing the failure of an intake preheater of an engine, wherein a voltage V is applied across the intake preheater+The loading voltage is DC5-12V, preferably 5V, and a sampling resistor R7 is connected in series at the low-voltage end of the intake air preheater to collect the voltage V at the low-voltage end of the intake air preheaterIN(i.e., the voltage across the sampling resistor R7) when the voltage V is collectedINJudging that the intake air preheater is not invalid within a set range; and when the acquired voltage exceeds a set range, judging that the air inlet preheater is invalid.
In the scheme, whether the air inlet preheater fails or not is judged through a double-limit window voltage comparison circuit, wherein the double-limit window voltage comparison circuit comprises a first comparison circuit, a second comparison circuit, a judgment circuit and an alarm HA, the first input end of the first comparison circuit is connected with a loading voltage, the second input end of the first comparison circuit is connected with the low-voltage end of the air inlet preheater, and the output end of the first comparison circuit is connected with the input end of the judgment circuit; the first input end of the second comparison circuit is connected with the low-voltage end of the air inlet preheater, the second input end of the second comparison circuit is connected with the loading voltage, the output end of the second comparison circuit is connected with the input end of the judgment circuit, and the output end of the judgment circuit is connected with the alarm.
In the above scheme, the first comparison circuit comprises a resistor R1, a resistor R2, a comparator A1 and a diode D1, wherein one end of the resistor R1 is connected with a loading voltage V+The other end of the resistor is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the sliding end of the resistor R2 is connected with the inverting input end of a comparator A1, the non-inverting input end of the comparator A1 is connected between a sampling resistor R7 and the air inlet preheater, and the output end of a comparator A1 is connected with the input end of a judgment circuit through a diode D1.
The second comparison circuit comprises a resistor R3, a resistor R4, a comparator A2 and a diode D2, wherein the resistor R2 and the resistor R4 are both potentiometers, and one end of the resistor R3 is connected with a loading voltage V+The other end of the resistor is connected with one end of a resistor R4, the other end of the resistor R4 is grounded, the sliding end of the resistor R4 is connected with the non-inverting input end of a comparator A2, the inverting input end of the comparator A2 is connected between a sampling resistor R7 and the air inlet preheater, and the output end of a comparator A2 is connected with the input end of a judgment circuit through a diode D2.
The judgment circuit comprises a resistor R5, a resistor R6, a triode VT and a relay KA, one end of the resistor R5 is connected with the output end of the first comparison circuit and the output end of the second comparison circuit, the other end of the resistor R5 is connected with the base electrode of the triode VT, one end of a coil of the relay KA and one end of a contact are connected with a power supply VCCThe other end of the coil of the relay KA is connected with a collector electrode of the triode VT through a resistor R6, an emitting electrode of the triode VT is grounded, the other end of a contact of the relay KA is connected with one end of the alarm HA, and the other end of the alarm HA is grounded.
The judgment principle of the double-limit window voltage comparison circuit is as follows: setting the threshold voltage V of the first comparison circuit by rotating the adjustable potentiometer of resistor R2 and resistor R41And a threshold voltage V of a second comparison circuit2In which V is1＜V2Voltage V to be collectedINRespectively with a threshold voltage V1And a threshold voltage V2Comparing when the voltage V isINWithin two threshold voltages (i.e. V)1＜VIN＜V2) When the alarm is in power failure, the triode VT is in saturated conduction, the coil of the relay KA is electrified, the normally closed contact is disconnected, and the alarm does not reportAlarming; when V isINOut of the range of the gate limit voltage (i.e. V)IN≤V1Or VIN≥V2) When the preheater is in failure, the triode VT is cut off, the coil KA of the relay loses power, the normally closed contact of the relay is reset and switched on, and the trigger alarm HA sends out a preheater failure alarm signal.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A failure diagnosis method for an engine intake preheater is characterized by comprising the following steps: the voltage is loaded at the two ends of the air inlet preheater, the sampling resistor is connected in series at one end of the low voltage of the air inlet preheater, the voltage at one end of the low voltage of the air inlet preheater is collected, and whether the air inlet preheater fails or not is judged according to the collected voltage.
2. The engine intake air preheater failure diagnostic method of claim 1, wherein: judging that the intake air preheater is not invalid when the acquired voltage is within a set range; and when the acquired voltage exceeds a set range, judging that the air inlet preheater is invalid.
3. The engine intake air preheater failure diagnostic method of claim 1, wherein: and judging whether the air inlet preheater fails or not through a double-limit window voltage comparison circuit.
4. An engine intake air preheater failure diagnostic method as recited in claim 3, wherein: the double-limit window voltage comparison circuit comprises a first comparison circuit, a second comparison circuit, a judgment circuit and an alarm, wherein a first input end of the first comparison circuit is connected with a loading voltage, a second input end of the first comparison circuit is connected with a low-voltage end of the air inlet preheater, and an output end of the first comparison circuit is connected with an input end of the judgment circuit; the first input end of the second comparison circuit is connected with the low-voltage end of the air inlet preheater, the second input end of the second comparison circuit is connected with the loading voltage, the output end of the second comparison circuit is connected with the input end of the judgment circuit, and the output end of the judgment circuit is connected with the alarm.
5. The engine intake air preheater failure diagnostic method of claim 4, wherein: comparing the acquired voltage with threshold voltages of a first comparison circuit and a second comparison circuit respectively; when the collected voltage is within the two threshold voltage ranges, the judgment circuit judges that the voltage is not invalid and does not give an alarm; when the acquired voltage is not in the two threshold voltage ranges, the judgment circuit judges that the voltage is invalid and carries out alarm prompt through the alarm.
6. An engine intake air preheater failure diagnostic method as recited in claim 5, wherein: the threshold voltage of the first comparison circuit is less than the threshold voltage of the second comparison circuit.
7. The engine intake air preheater failure diagnostic method of claim 4, wherein: the first comparison circuit comprises a resistor R1, a resistor R2, a comparator A1 and a diode D1, one end of the resistor R1 is connected with a loading voltage, the other end of the resistor R2 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded, the sliding end of the resistor R2 is connected with the inverting input end of the comparator A1, the non-inverting input end of the comparator A1 is connected between the sampling resistor R7 and the air inlet preheater, and the output end of the comparator A1 is connected with the input end of the judgment circuit through the diode D1.
8. The engine intake air preheater failure diagnostic method of claim 4, wherein: the second comparison circuit comprises a resistor R3, a resistor R4, a comparator A2 and a diode D2, one end of the resistor R3 is connected with a loading voltage, the other end of the resistor R4 is connected with one end of a resistor R4, the other end of the resistor R4 is grounded, the sliding end of the resistor R4 is connected with the non-inverting input end of the comparator A2, the inverting input end of the comparator A2 is connected between the sampling resistor R7 and the air inlet preheater, and the output end of the comparator A2 is connected with the input end of the judgment circuit through the diode D2.
9. The engine intake air preheater failure diagnostic method of claim 4, wherein: judge the circuit and include resistance R5, resistance R6, triode VT and relay KA, first comparison circuit and second comparison circuit's output is connected to resistance R5 one end, and triode VT's base is connected to the resistance R5 other end, the power is connected to relay KA's coil one end and contact one end, and relay KA's the coil other end connects triode VT's collecting electrode through resistance R6, triode VT's projecting pole ground connection, and alarm one end, alarm other end ground connection are connected to relay KA's the contact other end.
10. The engine intake air preheater failure diagnostic method of claim 1, wherein: the magnitude of the loading voltage is DC 5-12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762126.8A CN111997757A (en) | 2020-07-31 | 2020-07-31 | Failure diagnosis method for air inlet preheater of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010762126.8A CN111997757A (en) | 2020-07-31 | 2020-07-31 | Failure diagnosis method for air inlet preheater of engine |
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| CN111997757A true CN111997757A (en) | 2020-11-27 |
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| CN202010762126.8A Pending CN111997757A (en) | 2020-07-31 | 2020-07-31 | Failure diagnosis method for air inlet preheater of engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023115181A1 (en) * | 2021-12-20 | 2023-06-29 | Robert Bosch Limitada | Method for diagnosing faults in the operation of a fuel heating system associated with an internal combustion engine |
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Application publication date: 20201127 |