CN104111129B - Cooling-water temperature sensor detection method - Google Patents

Cooling-water temperature sensor detection method Download PDF

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Publication number
CN104111129B
CN104111129B CN201410347381.0A CN201410347381A CN104111129B CN 104111129 B CN104111129 B CN 104111129B CN 201410347381 A CN201410347381 A CN 201410347381A CN 104111129 B CN104111129 B CN 104111129B
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cooling
temperature sensor
water temperature
resistance
calibrating terminal
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CN104111129A (en
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唐菲
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Chery Automobile Co Ltd
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SAIC Chery Automobile Co Ltd
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Abstract

The purpose of the present invention is to propose to a kind of cooling-water temperature sensor detection stand and cooling-water temperature sensor detection method based on this stand, whether lost efficacy for the cooling-water temperature sensor judging automobile engine.The cooling-water temperature sensor detection stand of the present invention includes power supply, ammeter, by norm resistance, voltmeter, heater and for the first calibrating terminal connected with cooling-water temperature sensor terminal, the second calibrating terminal, the positive pole of described power supply, ammeter, by norm resistance, the first calibrating terminal series connection, the negative pole of described power supply and the second calibrating terminal connect, and two test leads of described voltmeter are connected with the first calibrating terminal, the second calibrating terminal respectively;Described heater be provided with can accommodate cooling-water temperature sensor to be tested water tank and in heating water tank the heater of liquid, described water tank is provided with the cover plate that can fix cooling-water temperature sensor to be tested.The detection method of the present invention comprehensively and need not set up data base, and the scope of application is wider.

Description

Cooling-water temperature sensor detection method
Technical field
The present invention relates to a kind of automobile engine water temperature sensor detection stand and cooling-water temperature sensor detection method based on this stand, it is adaptable to detection to engine water temperature sensor during automobile after-sales service.
Background technology
The cooling-water temperature sensor of automobile engine is used for monitoring the real-time water temperature of electromotor, is very important sensor in automobile engine.Once cooling-water temperature sensor lost efficacy, and engine electronic control system module receives the engine water temperature information of mistake, and automobile engine work will be caused abnormal.On the contrary, when automobile engine work is abnormal, such as, under the failure condition such as engine idle is bad, bad Acceleration, the technician of after-sale service station often checks cooling-water temperature sensor, the most directly change cooling-water temperature sensor, thus bring unnecessary claim and interests loss to automobile main frame maker.
But existence conditions based on after-sale service station, cannot simply and effectively judge that cooling-water temperature sensor the most really lost efficacy, can not tackle and make strong containment measure without the loss brought according to replacing cooling-water temperature sensor, therefore it provides a kind of simple and effective cooling-water temperature sensor detection stand and detection method are necessary.
The patent of invention of Patent No. CN200810155361.8 proposes a kind of cooling-water temperature sensor detection device, and this invention judges that the premise whether cooling-water temperature sensor lost efficacy is have to contrast with a normal cooling-water temperature sensor resistance.By the cooling-water temperature sensor of the normal cooling-water temperature sensor of contrast and inefficacy resistance under different water temperatures, set up data base, the standard of judge of losing efficacy as later stage cooling-water temperature sensor.There is following defect in this invention: 1, needs to set up corresponding data base for different types of cooling-water temperature sensor, should not manage, and needs long-term each one of different types of normal water temperature sensor of deposit;2, set up data base and need the data accumulation of long period, the effect of judge cannot be played at the Database initial stage;3, the resistance under cooling-water temperature sensor no-load condition can only be detected, it is impossible to the failure mode of cooling-water temperature sensor is completely covered;4, the judgement that cooling-water temperature sensor was lost efficacy by professional person during engine rig test it is only applicable to, it is impossible to be fully solved the maintainer judgement to cooling-water temperature sensor in automobile application process.
Summary of the invention
The purpose of the present invention is to propose to a kind of cooling-water temperature sensor detection stand and cooling-water temperature sensor detection method based on this stand, whether lost efficacy for the cooling-water temperature sensor judging automobile engine.
The cooling-water temperature sensor detection stand of the present invention includes power supply, ammeter, by norm resistance, voltmeter, heater and for the first calibrating terminal connected with cooling-water temperature sensor terminal, the second calibrating terminal, the positive pole of described power supply, ammeter, by norm resistance, the first calibrating terminal series connection, the negative pole of described power supply and the second calibrating terminal connect, and two test leads of described voltmeter are connected with the first calibrating terminal, the second calibrating terminal respectively;Described heater be provided with can accommodate cooling-water temperature sensor to be tested water tank and in heating water tank the heater of liquid, described water tank is provided with the cover plate that can fix cooling-water temperature sensor to be tested.
Specifically, described power supply is the regulated power supply being in series by accumulator, switch and manostat.
The cooling-water temperature sensor detection method based on above-mentioned cooling-water temperature sensor detection stand that the present invention proposes is as follows: respectively under the two states that heater does not heats and heats, test out resistance when cooling-water temperature sensor accesses test circuit and do not accesses test circuit, if under the conditions of same temperature, the difference of resistance value when cooling-water temperature sensor accesses test circuit and do not accesses test circuit is in preset range, then represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
Specifically, above-mentioned cooling-water temperature sensor detection method comprises the steps:
A: first cooling-water temperature sensor is fixed on the cover plate of heater, cooling-water temperature sensor screw thread is made to be totally immersed in the liquid in water tank with lower part, utilize the resistance RL0 between two terminals of circuit tester test cooling-water temperature sensor record, then cooling-water temperature sensor is connected with the first calibrating terminal, the second calibrating terminal, make regulated power supply, ammeter, by norm resistance, cooling-water temperature sensor constitute complete loops and cooling-water temperature sensor is energized, utilize voltmeter, the real time data of ammeter calculates the resistance RL1 between two terminals of cooling-water temperature sensor record;
B: utilize the liquid in heater heating water tank, after making the temperature of liquid in water tank reach predetermined temperature and keep this preset temperature for preset time, utilize voltmeter, the real time data of ammeter calculates the resistance RH1 between two terminals of cooling-water temperature sensor record, then cooling-water temperature sensor and the first calibrating terminal, the second calibrating terminal are disconnected, utilize the resistance RH0 between two terminals of circuit tester test cooling-water temperature sensor record;
C: if the difference of resistance RL0 and resistance RL1 is in preset range, and the difference of resistance RH0 and resistance RH1 is in preset range, then it represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.
Utilize voltmeter, the real time data of ammeter calculates the method for the resistance between two terminals of cooling-water temperature sensor following two, tester can utilize two kinds of methods calculate the resistance value between two terminals of cooling-water temperature sensor and contrast, to avoid mistake in computation simultaneously:
1, in described step A, RL1=UL1/IL1, wherein UL1 is the magnitude of voltage that voltmeter is measured in real time, and IL1 is the current value that ammeter is measured in real time;In described step B, RH1=UH1/IH1, wherein UH1 is the magnitude of voltage that voltmeter is measured in real time, and IH1 is the current value that ammeter is measured in real time.
2, in described step A, RL1=UL1*R0/(U0-UL1), wherein UL1 is the magnitude of voltage that voltmeter is measured in real time, and U0 is the voltage output value of regulated power supply, and R0 is the resistance of described quota resistance;In described step B, RH1=UH1*R0/(U0-UH1), wherein UH1 is the magnitude of voltage that voltmeter is measured in real time, and U0 is the voltage output value of regulated power supply, and R0 is the resistance of described quota resistance.
In general, the fault type of automobile engine water temperature sensor has three kinds: inner inlet after intraware open circuit, short circuit, mechanical damage, wherein the fault of open circuit and short circuit just can be detected by conventional sense (method measuring resistance with circuit tester the most at ambient and elevated temperatures), but inner inlet is None-identified.The present invention can cover detection and the identification of three kinds of fault types of cooling-water temperature sensor simultaneously; and the detection method of the present invention need not set up data base; and the scope of application is wider; the cooling-water temperature sensor of client vehicles can be detected by automobile after-sale service station by cooling-water temperature sensor detection stand and the detection method that the present invention provides; farthest reduce the quantity of unreasonable replacing cooling-water temperature sensor because of None-identified cooling-water temperature sensor whether fault; thus reduce the claim quantity of automobile main frame maker, protect the interests of each main engine plants.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the cooling-water temperature sensor detection stand of the present invention.
Detailed description of the invention
Below against accompanying drawing, by the description to embodiment, the detailed description of the invention such as mutual alignment between the involved shape of each component, structure, each several part and annexation, the effect of each several part and operation principle etc. of the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, the cooling-water temperature sensor detection stand of the present embodiment includes by accumulator 1, the regulated power supply (output voltage is 5 ± 0.25V) that switch 2 and manostat 3 are in series, ammeter 4, resistance 5(resistance is 1K Ω by norm), voltmeter 7, heater 8 and for the first calibrating terminal 10 of connecting with cooling-water temperature sensor terminal, second calibrating terminal 11, the positive pole of described regulated power supply, ammeter 4, resistance 5 by norm, first calibrating terminal 10 is connected, negative pole and second calibrating terminal 11 of described regulated power supply connect, two test leads of described voltmeter 7 respectively with the first calibrating terminal 10, second calibrating terminal 11 is connected;Described heater 8 be provided with can accommodate cooling-water temperature sensor 6 to be tested water tank and in heating water tank the heater (being not drawn into heater in figure) of liquid, described water tank is provided with the cover plate 9 that can fix cooling-water temperature sensor 6 to be tested.
The cooling-water temperature sensor detection method based on above-mentioned cooling-water temperature sensor detection stand that this example proposes is as follows: respectively under the two states that heater 8 does not heats and heats, test out resistance when cooling-water temperature sensor 6 accesses test circuit and do not accesses test circuit, if under the conditions of same temperature, the difference of resistance value when cooling-water temperature sensor 6 accesses test circuit and do not accesses test circuit is in preset range, then represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
Specifically, above-mentioned cooling-water temperature sensor detection method comprises the steps:
A: first cooling-water temperature sensor 6 is fixed on the cover plate of heater 8, cooling-water temperature sensor 6 screw thread is made to be totally immersed in the liquid in water tank with lower part, utilize the resistance RL0 between two terminals of circuit tester test cooling-water temperature sensor 6 record, then by cooling-water temperature sensor 6 and the first calibrating terminal 10, second calibrating terminal 11 is connected, make regulated power supply, ammeter 4, resistance 5 by norm, cooling-water temperature sensor 6 constitutes complete loops and is energized cooling-water temperature sensor 6, utilize voltmeter 7, the real time data of ammeter 4 calculates the resistance RL1 between two terminals of cooling-water temperature sensor 6 record, described RL1=UL1/IL1, wherein UL1 is the most measured magnitude of voltage of voltmeter 7, IL1 is the most measured current value of ammeter 4;
B: utilize the liquid in heater heating water tank, after making the temperature of liquid in water tank reach predetermined temperature and keep this preset temperature for preset time, voltmeter 7, the real time data of ammeter 4 is utilized to calculate the resistance RH1 between two terminals of cooling-water temperature sensor 6 record, described RH1=UH1/IH1, wherein UH1 is the most measured magnitude of voltage of voltmeter 7, and IH1 is the most measured current value of ammeter 4;Then cooling-water temperature sensor 6 is disconnected with first calibrating terminal the 10, second calibrating terminal 11, utilize the resistance RH0 between two terminals of circuit tester test cooling-water temperature sensor 6 record;
C: if the difference of resistance RL0 and resistance RL1 is in preset range, and the difference of resistance RH0 and resistance RH1 is in preset range, then it represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.

Claims (5)

1. a cooling-water temperature sensor detection method, the cooling-water temperature sensor detection stand used includes power supply, ammeter, by norm resistance, voltmeter, heater and for the first calibrating terminal connected with cooling-water temperature sensor terminal, the second calibrating terminal, the positive pole of described power supply, ammeter, by norm resistance, the first calibrating terminal series connection, the negative pole of described power supply and the second calibrating terminal connect, and two test leads of described voltmeter are connected with the first calibrating terminal, the second calibrating terminal respectively;Described heater be provided with can accommodate cooling-water temperature sensor to be tested water tank and in heating water tank the heater of liquid, described water tank is provided with the cover plate that can fix cooling-water temperature sensor to be tested;It is characterized in that this cooling-water temperature sensor detection method is as follows: respectively under the two states that heater does not heats and heats, test out resistance when cooling-water temperature sensor accesses test circuit and do not accesses test circuit, if under the conditions of same temperature, the difference of resistance value when cooling-water temperature sensor accesses test circuit and do not accesses test circuit is in preset range, then represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
Cooling-water temperature sensor detection method the most according to claim 1, it is characterised in that described power supply is the regulated power supply being in series by accumulator, switch and manostat.
Cooling-water temperature sensor detection method the most according to claim 1, it is characterised in that comprise the steps:
A: first cooling-water temperature sensor is fixed on the cover plate of heater, cooling-water temperature sensor screw thread is made to be totally immersed in the liquid in water tank with lower part, utilize the resistance RL0 between two terminals of circuit tester test cooling-water temperature sensor record, then cooling-water temperature sensor is connected with the first calibrating terminal, the second calibrating terminal, make regulated power supply, ammeter, by norm resistance, cooling-water temperature sensor constitute complete loops and cooling-water temperature sensor is energized, utilize voltmeter, the real time data of ammeter calculates the resistance RL1 between two terminals of cooling-water temperature sensor record;
B: utilize the liquid in heater heating water tank, after making the temperature of liquid in water tank reach predetermined temperature and keep this preset temperature for preset time, utilize voltmeter, the real time data of ammeter calculates the resistance RH1 between two terminals of cooling-water temperature sensor record, then cooling-water temperature sensor and the first calibrating terminal, the second calibrating terminal are disconnected, utilize the resistance RH0 between two terminals of circuit tester test cooling-water temperature sensor record;
C: if the difference of resistance RL0 and resistance RL1 is in preset range, and the difference of resistance RH0 and resistance RH1 is in preset range, then it represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.
Cooling-water temperature sensor detection method the most according to claim 3, it is characterised in that in described step A, RL1=UL1/IL1, wherein UL1 is the magnitude of voltage that voltmeter is measured in real time, and IL1 is the current value that ammeter is measured in real time;In described step B, RH1=UH1/IH1, wherein UH1 is the magnitude of voltage that voltmeter is measured in real time, and IH1 is the current value that ammeter is measured in real time.
Cooling-water temperature sensor detection method the most according to claim 3, it is characterized in that in described step A, RL1=UL1*R0/(U0-UL1), wherein UL1 is the magnitude of voltage that voltmeter is measured in real time, U0 is the voltage output value of regulated power supply, and R0 is the resistance of described quota resistance;In described step B, RH1=UH1*R0/(U0-UH1), wherein UH1 is the magnitude of voltage that voltmeter is measured in real time, and U0 is the voltage output value of regulated power supply, and R0 is the resistance of described quota resistance.
CN201410347381.0A 2014-07-21 2014-07-21 Cooling-water temperature sensor detection method Active CN104111129B (en)

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Publication number Priority date Publication date Assignee Title
CN108692942A (en) * 2018-05-24 2018-10-23 奇瑞汽车股份有限公司 A kind of engine sensor detecting system and detection method
CN108593147A (en) * 2018-08-03 2018-09-28 柴德维 A kind of detection device suitable for water temperature sensor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216356A (en) * 2007-01-04 2008-07-09 海尔集团公司 Temperature sensor failure testing method and apparatus
CN201672994U (en) * 2010-05-31 2010-12-15 南京工程学院 Automobile coolant temperature sensor testing device
CN202403837U (en) * 2012-01-09 2012-08-29 中山市铧禧电子科技有限公司 Temperature sensor detecting platform

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216356A (en) * 2007-01-04 2008-07-09 海尔集团公司 Temperature sensor failure testing method and apparatus
CN201672994U (en) * 2010-05-31 2010-12-15 南京工程学院 Automobile coolant temperature sensor testing device
CN202403837U (en) * 2012-01-09 2012-08-29 中山市铧禧电子科技有限公司 Temperature sensor detecting platform

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